agent_core/core/

config.rs

use crate::core::shell_config::ShellConfig;
use std::collections::BTreeMap;
use std::path::PathBuf;
use std::sync::OnceLock;

static PROFILE_NAME: OnceLock<Option<String>> = OnceLock::new();
static PROVIDER_KEYS: OnceLock<BTreeMap<String, String>> = OnceLock::new();
static IDENTITY: OnceLock<String> = OnceLock::new();

pub const DEFAULT_IDENTITY: &str =
    "You are an AI assistant running in SynapsCLI, an open-source agent runtime.";

/// Returns the configured identity string for the system prompt preamble.
/// Falls back to `DEFAULT_IDENTITY` (the SynapsCLI identity above) if not set
/// in config. Initialized by `load_config()` — safe to call anytime after boot.
pub fn get_identity() -> String {
    IDENTITY
        .get()
        .cloned()
        .unwrap_or_else(|| DEFAULT_IDENTITY.to_string())
}

/// Provider API keys parsed from `provider.<name> = ...` lines in config.
/// Empty if `load_config()` hasn't been called. The registry falls back to
/// env vars, so e.g. `GROQ_API_KEY` works even with an empty map.
pub fn get_provider_keys() -> BTreeMap<String, String> {
    PROVIDER_KEYS.get().cloned().unwrap_or_default()
}

/// Returns the active profile name, if any.
/// Reads from `SYNAPS_PROFILE` environment variable if not already set programmatically.
pub fn get_profile() -> Option<String> {
    PROFILE_NAME
        .get_or_init(|| std::env::var("SYNAPS_PROFILE").ok())
        .clone()
}

/// Sets the active profile name. Must be called before any `get_profile()` call
/// (i.e., before config resolution begins). Uses OnceLock — first write wins,
/// subsequent calls are no-ops. No env var mutation (unsafe under tokio).
pub fn set_profile(name: Option<String>) {
    let _ = PROFILE_NAME.set(name);
}

pub fn base_dir() -> PathBuf {
    if let Ok(path) = std::env::var("SYNAPS_BASE_DIR") {
        return PathBuf::from(path);
    }
    let home = std::env::var("HOME")
        .or_else(|_| std::env::var("USERPROFILE"))
        .unwrap_or_else(|_| ".".to_string());
    PathBuf::from(home).join(".synaps-cli")
}

/// Overrides the Synaps base directory. Intended for tests and embedded harnesses.
#[doc(hidden)]
pub fn set_base_dir_for_tests(path: PathBuf) {
    std::env::set_var("SYNAPS_BASE_DIR", path);
}

/// Resolves a path for reading. Checks the profile folder first, then falls back to the default folder.
pub fn resolve_read_path(filename: &str) -> PathBuf {
    let base = base_dir();

    if let Some(profile) = get_profile() {
        let profile_path = base.join(&profile).join(filename);
        if profile_path.exists() {
            return profile_path;
        }
    }

    base.join(filename)
}

/// Resolves a path for reading with an extended arbitrary path tree.
pub fn resolve_read_path_extended(path: &str) -> PathBuf {
    let base = base_dir();

    if let Some(profile) = get_profile() {
        let profile_path = base.join(&profile).join(path);
        if profile_path.exists() {
            return profile_path;
        }
    }

    base.join(path)
}

/// Resolves a path for writing. Unconditionally writes to the profile folder if a profile is active.
pub fn resolve_write_path(filename: &str) -> PathBuf {
    let mut base = base_dir();

    if let Some(profile) = get_profile() {
        base.push(profile);
    }

    let _ = std::fs::create_dir_all(&base);
    base.join(filename)
}

/// Gets the absolute directory for the current profile (or root if default).
pub fn get_active_config_dir() -> PathBuf {
    let mut base = base_dir();
    if let Some(profile) = get_profile() {
        base.push(profile);
    }
    base
}

/// Automatic context management is opt-in; independent of compaction disclosure.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum ContextManagementMode {
    #[default]
    Off,
    Auto,
}

impl ContextManagementMode {
    pub fn parse(value: &str) -> Option<Self> {
        match value.trim().to_ascii_lowercase().as_str() {
            "off" => Some(Self::Off),
            "auto" => Some(Self::Auto),
            _ => None,
        }
    }

    pub fn as_str(self) -> &'static str {
        match self {
            Self::Off => "off",
            Self::Auto => "auto",
        }
    }
}

/// Task-aware soft context bands, parsed from `context_management.*` keys.
///
/// Missing thresholds use window-aware defaults (200k: 140k/180k;
/// 1m: 250k/400k). A single override adjusts the other default as necessary
/// to keep pressure below rollover. These settings never override the host's
/// hard capacity or authorize tools, disclosure, or a session transition.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct ContextManagementConfig {
    pub mode: ContextManagementMode,
    /// Optional absolute token threshold; `auto` in config clears the override.
    pub pressure_tokens: Option<u64>,
    /// Optional absolute token threshold; `auto` in config clears the override.
    pub rollover_tokens: Option<u64>,
    /// Minimum remaining headroom before any model round. Default: 16,000.
    pub reserve_tokens: u64,
    /// Maximum extra Plan/WrapUp rounds after rollover becomes due. Default: 2.
    /// Zero disables extensions; phase reports cannot renew this allowance.
    pub finish_rounds: u32,
}

impl Default for ContextManagementConfig {
    fn default() -> Self {
        Self {
            mode: ContextManagementMode::Off,
            pressure_tokens: None,
            rollover_tokens: None,
            reserve_tokens: 16_000,
            finish_rounds: 2,
        }
    }
}

impl ContextManagementConfig {
    pub const MAX_FINISH_ROUNDS: u32 = 8;
    pub const MAX_RESERVE_TOKENS: u64 = 1_000_000;

    /// Validate independently of a model selection. Also call
    /// `validate_for_window` when the effective context window is known.
    pub fn validate(&self) -> Result<(), &'static str> {
        if self.pressure_tokens == Some(0) {
            return Err("pressure_tokens must be positive");
        }
        if self.rollover_tokens.is_some_and(|v| v < 2) {
            return Err("rollover_tokens must be at least 2");
        }
        if let (Some(pressure), Some(rollover)) = (self.pressure_tokens, self.rollover_tokens) {
            if pressure >= rollover {
                return Err("pressure_tokens must be below rollover_tokens");
            }
        }
        if !(1..=Self::MAX_RESERVE_TOKENS).contains(&self.reserve_tokens) {
            return Err("reserve_tokens must be between 1 and 1000000");
        }
        if self.finish_rounds > Self::MAX_FINISH_ROUNDS {
            return Err("finish_rounds must be between 0 and 8");
        }
        Ok(())
    }

    /// Threshold overrides must fit the effective window. The hard budget
    /// remains authoritative even when an override fits this validation.
    pub fn validate_for_window(&self, context_window_tokens: u64) -> Result<(), &'static str> {
        self.validate()?;
        if context_window_tokens < 2 {
            return Err("context window must contain at least two tokens");
        }
        if self
            .pressure_tokens
            .is_some_and(|v| v >= context_window_tokens)
        {
            return Err("pressure_tokens must be below the context window");
        }
        if self
            .rollover_tokens
            .is_some_and(|v| v > context_window_tokens)
        {
            return Err("rollover_tokens must not exceed the context window");
        }
        Ok(())
    }
}

/// Parse fields first; validate the complete policy after all lines so threshold
/// ordering and an explicit context window do not depend on config key order.
fn parse_context_management_config_key(
    config: &mut ContextManagementConfig,
    key: &str,
    value: &str,
) -> Result<(), &'static str> {
    match key {
        "context_management.mode" => {
            config.mode = ContextManagementMode::parse(value).ok_or("expected off or auto")?;
        }
        "context_management.pressure_tokens" | "context_management.rollover_tokens" => {
            let tokens = if value.eq_ignore_ascii_case("auto") {
                None
            } else {
                Some(
                    value
                        .parse::<u64>()
                        .map_err(|_| "expected auto or an unsigned token count")?,
                )
            };
            if key == "context_management.pressure_tokens" {
                config.pressure_tokens = tokens;
            } else {
                config.rollover_tokens = tokens;
            }
        }
        "context_management.reserve_tokens" => {
            config.reserve_tokens = value
                .parse()
                .map_err(|_| "expected an unsigned token count")?;
        }
        "context_management.finish_rounds" => {
            config.finish_rounds = value
                .parse()
                .map_err(|_| "expected an unsigned round count")?;
        }
        _ => return Err("unknown context management key"),
    }
    Ok(())
}

/// Startup / first-turn behaviour (`startup.*` keys). Boot-time only — these
/// take effect at the next launch, never mid-session.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct StartupConfig {
    /// Skip blocking on extension discovery before the first turn. When true
    /// the attach path sets `await_extensions=false` (fast cold start; a tool
    /// from a slow extension may be unavailable on turn 1). Default: true.
    pub quick_start: bool,
    /// Max seconds to wait for extensions when Quick Start is off. Default: 30.
    pub extensions_ready_timeout_secs: u64,
}

impl Default for StartupConfig {
    fn default() -> Self {
        Self {
            quick_start: true,
            extensions_ready_timeout_secs: 30,
        }
    }
}

/// Daemon lifetime knobs (`daemon.*` keys). Config-file fallbacks; the matching
/// `SYNAPS_DAEMON_*` env vars still WIN over these when set.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct DaemonConfig {
    /// Seconds an auto-spawned daemon stays alive after the last client
    /// disconnects. `0` = never idle-exit. Env `SYNAPS_DAEMON_IDLE_EXIT_SECS`
    /// overrides. Default: 10.
    pub idle_exit_secs: u64,
    /// Seconds a pending host confirmation on a detached session survives
    /// before it is fail-closed answered `None`. `0` = disabled (survives
    /// forever). Env `SYNAPS_DAEMON_PROMPT_ABANDON_SECS` overrides. Default: 3600.
    pub prompt_abandon_secs: u64,
    /// Seconds a PARKED session row lingers before eviction. `0` = keep
    /// forever. Env `SYNAPS_DAEMON_PARKED_EVICT_SECS` overrides. Default: 3600.
    pub parked_evict_secs: u64,
}

impl Default for DaemonConfig {
    fn default() -> Self {
        Self {
            idle_exit_secs: 10,
            prompt_abandon_secs: 3600,
            parked_evict_secs: 3600,
        }
    }
}

/// Subagent fan-out limits (`subagent.*` keys). They apply to the whole
/// delegation tree of one session: workers started by workers count against
/// the same limits as workers started by the foreground. A prompt manifest
/// with an explicit delegation policy sets its own concurrency and total
/// limits; `max_depth` applies either way.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct SubagentLimits {
    /// Workers running at the same time. Default: 16.
    pub max_concurrent: usize,
    /// Workers dispatched and not yet collected with `reconciled=true`
    /// (running, finished, or collected without reconciling). Default: 64.
    pub max_total: usize,
    /// How deep workers may nest: 1 = only the foreground delegates,
    /// 2 = its workers may delegate once more, and so on. Default: 4.
    pub max_depth: u16,
}

impl Default for SubagentLimits {
    fn default() -> Self {
        Self {
            max_concurrent: 16,
            max_total: 64,
            max_depth: 4,
        }
    }
}

/// Parse `subagent.*` keys. Unknown keys and invalid values return an error
/// (caller warns and keeps the default).
fn parse_subagent_config_key(
    config: &mut SubagentLimits,
    key: &str,
    value: &str,
) -> Result<(), &'static str> {
    let positive = || match value.trim().parse::<usize>() {
        Ok(n) if n > 0 => Ok(n),
        _ => Err("expected a whole number of at least 1"),
    };
    match key {
        "subagent.max_concurrent" => config.max_concurrent = positive()?,
        "subagent.max_total" => config.max_total = positive()?,
        "subagent.max_depth" => {
            config.max_depth =
                u16::try_from(positive()?).map_err(|_| "expected a whole number from 1 to 65535")?
        }
        _ => return Err("unknown subagent key"),
    }
    Ok(())
}

/// Parse `startup.*` keys. Unknown keys return an error (caller warns).
fn parse_startup_config_key(
    config: &mut StartupConfig,
    key: &str,
    value: &str,
) -> Result<(), &'static str> {
    match key {
        "startup.quick_start" => {
            config.quick_start = match value.trim() {
                "true" | "1" | "on" | "yes" => true,
                "false" | "0" | "off" | "no" => false,
                _ => return Err("expected on or off"),
            };
        }
        "startup.extensions_ready_timeout_secs" => {
            config.extensions_ready_timeout_secs =
                value.trim().parse().map_err(|_| "expected an unsigned second count")?;
        }
        _ => return Err("unknown startup key"),
    }
    Ok(())
}

/// Parse `daemon.*` keys. Unknown keys return an error (caller warns).
fn parse_daemon_config_key(
    config: &mut DaemonConfig,
    key: &str,
    value: &str,
) -> Result<(), &'static str> {
    let secs = || value.trim().parse::<u64>().map_err(|_| "expected an unsigned second count");
    match key {
        "daemon.idle_exit_secs" => config.idle_exit_secs = secs()?,
        "daemon.prompt_abandon_secs" => config.prompt_abandon_secs = secs()?,
        "daemon.parked_evict_secs" => config.parked_evict_secs = secs()?,
        _ => return Err("unknown daemon key"),
    }
    Ok(())
}

/// Server security configuration parsed from `server.*` keys.
#[derive(Debug, Clone, Default)]
pub struct ServerConfig {
    /// Comma-separated list of allowed Origin headers. Empty = allow all (localhost-only protection).
    pub allowed_origins: Vec<String>,
    /// Pre-shared authentication token. If set, clients must provide it on WebSocket upgrade
    /// via `?token=X` query param or `Authorization: Bearer X` header. If None, auto-generated on boot.
    pub token: Option<String>,
    /// When true, `HookResult::Confirm` is auto-approved without prompting (useful for headless/agent mode).
    pub auto_approve_confirms: bool,
    /// Maximum inbound message size in bytes. Defaults to context_window * 4 (rough token→byte estimate).
    /// None means no artificial cap.
    pub max_message_size: Option<usize>,
}

/// Bridge daemon configuration parsed from `bridge.*` keys.
///
/// Controls best-effort mirroring of watcher heartbeats over the bridge
/// daemon's UDS `ControlSocket` (`heartbeat_emit` op). All keys are optional
/// and the feature is OFF by default.
#[derive(Debug, Clone)]
pub struct BridgeConfig {
    /// Path to the bridge daemon's UDS control socket.
    /// When `None`, defaults to `base_dir().join("bridge/control.sock")`.
    pub uds_path: Option<PathBuf>,
    /// When true, every watcher heartbeat tick mirrors a `heartbeat_emit`
    /// JSON-RPC call over the UDS socket. Errors are logged at debug only.
    pub heartbeat_mirror: bool,
    /// Per-call timeout in milliseconds (covers connect + write + read).
    pub heartbeat_timeout_ms: u64,
}

impl Default for BridgeConfig {
    fn default() -> Self {
        Self {
            uds_path: None,
            heartbeat_mirror: false,
            heartbeat_timeout_ms: 250,
        }
    }
}

impl BridgeConfig {
    /// Resolve the UDS path, falling back to the default under `base_dir()`.
    pub fn resolved_uds_path(&self) -> PathBuf {
        self.uds_path
            .clone()
            .unwrap_or_else(|| base_dir().join("bridge/control.sock"))
    }
}

/// Auth configuration parsed from `auth.*` keys. Controls whether this client
/// resolves provider tokens from the local `auth.json` (default) or from a
/// remote credential broker. See task #157 / `auth::credential_source`.
#[derive(Debug, Clone, Default)]
pub struct AuthConfig {
    /// Broker base URL. When set (here, or via `SYNAPS_AUTH_ENDPOINT`), the
    /// client fetches short-lived access tokens from the broker instead of
    /// reading/refreshing the local `auth.json`.
    pub remote_endpoint: Option<String>,
    /// Per-machine bearer presented to the broker (or `SYNAPS_MACHINE_TOKEN`).
    /// This is the machine's own identity, never the provider credential.
    pub machine_token: Option<String>,
}

impl AuthConfig {
    /// Resolve the credential source. Environment variables take precedence over
    /// config-file values: `SYNAPS_AUTH_ENDPOINT` / `SYNAPS_MACHINE_TOKEN`.
    /// Returns `Remote` iff an endpoint is set (env or config), else `Local`.
    pub fn credential_source(&self) -> crate::core::auth::CredentialSource {
        let endpoint = std::env::var("SYNAPS_AUTH_ENDPOINT")
            .ok()
            .filter(|s| !s.trim().is_empty())
            .or_else(|| self.remote_endpoint.clone());
        let machine_token = std::env::var("SYNAPS_MACHINE_TOKEN")
            .ok()
            .filter(|s| !s.trim().is_empty())
            .or_else(|| self.machine_token.clone());
        crate::core::auth::CredentialSource::from_parts(endpoint, machine_token)
    }
}

/// Upper bound for the `<N>h` form of `cache_keepwarm`. The ski-rental bound
/// already caps an abandoned session's spend at about one prefix rewrite; the
/// hour cap is an extra, user-chosen wall on top of it.
pub const MAX_CACHE_KEEPWARM_HOURS: u32 = 48;

/// Default for `cache_keepwarm_auto_max_hours`: the longest an `auto` idle
/// period may run. Without it the ski-rental bound alone lets a 0.05×
/// cache-read model (Opus 5.5, Sonnet 5.5) ping ~39 times over ~36h and a
/// 0.025× model (Fable 5.1, Mythos 5.1) ~79 times over ~72h under a 1h TTL,
/// keeping an abandoned session unparked for days. 24h: a user who steps
/// away for a working day or overnight still comes back to a warm cache; a
/// session left over a weekend parks. (Owner decision, task #444.)
pub const DEFAULT_CACHE_KEEPWARM_AUTO_MAX_HOURS: u32 = 24;

/// Prompt-cache keep-warm policy (`cache_keepwarm`, task #444). See
/// docs/specs/cache-ttl-spec.md §7.
///
/// - `Off` (default): never ping.
/// - `Auto`: ping while the measured ping spend of the current idle period
///   stays below the cost of the cache rewrite it prevents (ski-rental rule:
///   at most 2× the optimal spend, at most ~one rewrite on an abandoned
///   session), and for at most `cache_keepwarm_auto_max_hours` (default
///   [`DEFAULT_CACHE_KEEPWARM_AUTO_MAX_HOURS`]) after the session went idle.
/// - `Hours(n)`: the same bound, and additionally stop `n` hours after the
///   session went idle — whichever comes first.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum CacheKeepWarm {
    #[default]
    Off,
    Auto,
    Hours(u32),
}

impl CacheKeepWarm {
    /// Parse `off` | `auto` | `<N>h` (case-insensitive; `0h` = off).
    /// `None` for anything else, including hours above
    /// [`MAX_CACHE_KEEPWARM_HOURS`].
    pub fn parse(val: &str) -> Option<CacheKeepWarm> {
        let v = val.trim().to_ascii_lowercase();
        match v.as_str() {
            "off" | "false" | "no" | "0" => return Some(CacheKeepWarm::Off),
            "auto" | "on" => return Some(CacheKeepWarm::Auto),
            _ => {}
        }
        let digits = v.strip_suffix('h')?;
        match digits.parse::<u32>().ok()? {
            0 => Some(CacheKeepWarm::Off),
            h if h <= MAX_CACHE_KEEPWARM_HOURS => Some(CacheKeepWarm::Hours(h)),
            _ => None,
        }
    }

    pub fn is_off(self) -> bool {
        self == CacheKeepWarm::Off
    }
}

impl std::fmt::Display for CacheKeepWarm {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            CacheKeepWarm::Off => f.write_str("off"),
            CacheKeepWarm::Auto => f.write_str("auto"),
            CacheKeepWarm::Hours(h) => write!(f, "{h}h"),
        }
    }
}

/// Prompt-cache TTL strategy for Anthropic requests.
///
/// Controls the `cache_control` value emitted at every cache marker site:
/// - `FiveMinutes` (default): bare `{"type": "ephemeral"}` — byte-identical
///   to historical payloads; the default path can never invalidate existing
///   cached prefixes.
/// - `OneHour`: `{"type": "ephemeral", "ttl": "1h"}` on all markers.
/// - `Hybrid`: 1h on the stable prefix (tools + system, written rarely),
///   bare 5m on the message-tail marker (written every turn).
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum CacheTtl {
    #[default]
    FiveMinutes,
    OneHour,
    Hybrid,
}

impl CacheTtl {
    /// Parse a config value (case-insensitive). Returns `None` for unknown
    /// values so the caller can warn and fall back to the default.
    pub fn parse(val: &str) -> Option<CacheTtl> {
        match val.to_ascii_lowercase().as_str() {
            "5m" | "5min" | "default" => Some(CacheTtl::FiveMinutes),
            "1h" | "60m" | "1hr" => Some(CacheTtl::OneHour),
            "hybrid" => Some(CacheTtl::Hybrid),
            _ => None,
        }
    }
}

/// `tools.activation_confirm` — host policy for model-initiated
/// `activate_tools` (progressive tool disclosure).
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub enum ActivationConfirm {
    /// Authorize model-initiated activation without prompting (default).
    #[default]
    Auto,
    /// Ask the host: the y/n "Confirm tool activation" dialog; only an
    /// explicit y/yes authorizes (fail-closed).
    Prompt,
    /// Never authorize model-initiated activation; no prompt is raised.
    Deny,
}

impl ActivationConfirm {
    pub fn parse(val: &str) -> Option<Self> {
        match val.trim().to_ascii_lowercase().as_str() {
            "auto" => Some(Self::Auto),
            "prompt" => Some(Self::Prompt),
            "deny" => Some(Self::Deny),
            _ => None,
        }
    }

    pub fn as_str(self) -> &'static str {
        match self {
            Self::Auto => "auto",
            Self::Prompt => "prompt",
            Self::Deny => "deny",
        }
    }
}

/// Animated theme-transition mode, parsed from `theme_transition`:
/// - `"on"` (default): cross-fade theme changes over the default 350 ms.
/// - `"off"`: instant snap — accessibility, and mercy on tmux-over-ssh.
/// - integer milliseconds: cross-fade over that duration (clamped to
///   0–2000 ms; `0` behaves like `off`).
///
/// Purely a TUI presentation knob: it changes *how* a new palette is
/// applied, never *which* palette wins.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum ThemeTransitionMode {
    #[default]
    On,
    Off,
    Ms(u64),
}

impl ThemeTransitionMode {
    /// Default cross-fade duration for `On` (and the fallback when a live
    /// palette update carries no advisory duration of its own).
    pub const DEFAULT_MS: u64 = 350;
    /// Duration ceiling — both this knob and MXC wire `fade_ms` clamp here.
    pub const MAX_MS: u64 = 2000;

    /// Parse a config value (case-insensitive). Returns `None` for unknown
    /// values so the caller can warn and fall back to the default.
    pub fn parse(val: &str) -> Option<ThemeTransitionMode> {
        match val.to_ascii_lowercase().as_str() {
            "on" | "true" | "yes" => Some(ThemeTransitionMode::On),
            "off" | "false" | "no" => Some(ThemeTransitionMode::Off),
            other => other
                .parse::<u64>()
                .ok()
                .map(|ms| ThemeTransitionMode::Ms(ms.min(Self::MAX_MS))),
        }
    }

    /// Effective default duration in milliseconds; `0` means "snap".
    pub fn duration_ms(self) -> u64 {
        match self {
            ThemeTransitionMode::On => Self::DEFAULT_MS,
            ThemeTransitionMode::Off => 0,
            ThemeTransitionMode::Ms(ms) => ms.min(Self::MAX_MS),
        }
    }
}

/// Runtime event routing configuration parsed from `events.*` keys.
///
/// Controls how runtime events (from the `EventQueue`) are delivered in
/// server and RPC modes.
#[derive(Debug, Clone)]
pub struct EventsConfig {
    /// When `true` (default), the server/RPC/daemon session automatically
    /// triggers a model turn when runtime events arrive while idle.  Set
    /// `events.auto_turn = false` (or `0` / `no` / `off`) to opt out.
    /// Unrecognised values fail safe to `false` with a warning.
    /// The consecutive-turn cap (`auto_turn_cap`) still applies regardless.
    pub auto_turn: bool,
    /// Maximum number of consecutive auto-triggered model turns before the
    /// engine parks and waits for real user input.  Set via
    /// `events.auto_turn_cap = N`.  Default **5**.
    ///
    /// `0` (or `unlimited` / `inf` / `infinite`) disables the cap entirely —
    /// "to infinity and beyond".  Unparseable values warn and keep the default.
    pub auto_turn_cap: u32,
}

/// Default for `events.auto_turn_cap` — mirrors `engine::reactor::AUTO_TURN_CAP`.
pub const DEFAULT_AUTO_TURN_CAP: u32 = 5;

impl Default for EventsConfig {
    fn default() -> Self {
        Self {
            auto_turn: true,
            auto_turn_cap: DEFAULT_AUTO_TURN_CAP,
        }
    }
}

/// Parse a `events.auto_turn_cap` value.  Returns `None` on garbage.
///
/// Accepts a non-negative integer (`0` = unlimited) or one of the aliases
/// `unlimited` / `inf` / `infinite` / `infinity` / `none` (all → `0`).
pub fn parse_auto_turn_cap(val: &str) -> Option<u32> {
    let normalised = val.trim().to_lowercase();
    match normalised.as_str() {
        "unlimited" | "inf" | "infinite" | "infinity" | "none" => Some(0),
        n => n.parse::<u32>().ok(),
    }
}

/// Parse `events.*` configuration keys. `Err` carries the diagnostic the
/// caller prints (stderr, unchanged); the value side effects are the same
/// either way (an unrecognised `auto_turn` still fails safe to `false`).
fn parse_events_config_key(cfg: &mut EventsConfig, key: &str, val: &str) -> Result<(), String> {
    if key == "events.auto_turn" {
        let normalised = val.trim().to_lowercase();
        match normalised.as_str() {
            // Explicit true values.
            "true" | "1" | "yes" | "on" => cfg.auto_turn = true,
            // Explicit false values.
            "false" | "0" | "no" | "off" => cfg.auto_turn = false,
            // Unrecognised: fail safe to false and warn so the user knows.
            other => {
                cfg.auto_turn = false;
                return Err(format!(
                    "warning: config: unrecognised value for events.auto_turn = {:?}; \
                     expected true/false/yes/no/on/off/1/0 — defaulting to false",
                    other
                ));
            }
        }
    } else if key == "events.auto_turn_cap" {
        match parse_auto_turn_cap(val) {
            Some(cap) => cfg.auto_turn_cap = cap,
            None => {
                return Err(format!(
                    "warning: config: unrecognised value for events.auto_turn_cap = {:?}; \
                     expected a non-negative integer or unlimited/inf/infinite (0 = unlimited) \
                     — keeping default {}",
                    val.trim(),
                    DEFAULT_AUTO_TURN_CAP
                ));
            }
        }
    } // unknown events.* keys ignored
    Ok(())
}

/// Typed per-role turn-budget overrides (Task 23, spec §8.1). Every field
/// is optional: unset fields keep the role's compiled default. Values are
/// parsed from `turn_budget.<role>.<field>` config keys.
#[derive(Debug, Clone, Default, PartialEq)]
pub struct TurnBudgetOverrides {
    pub max_provider_rounds: Option<u32>,
    pub max_tool_calls: Option<u32>,
    /// Wall-clock limit for one turn, in seconds. Unset = no limit (the
    /// default for every role); `0` also means no limit.
    pub max_elapsed_secs: Option<u64>,
    pub max_accumulated_tool_result_bytes: Option<usize>,
    pub max_context_tokens: Option<u64>,
    pub max_cost_usd: Option<f64>,
    /// Bounded auto-renewals of the provider-round allowance after it is
    /// exhausted mid-turn (spec §8.1). Each renewal resets the round counter;
    /// round renewals never reset wall-clock (durable context successors do). `0`
    /// disables graceful continuation (hard stop at the first exhaustion).
    pub max_round_renewals: Option<u32>,
}

/// Per-role turn budgets (foreground, autonomous/watcher, worker).
#[derive(Debug, Clone, Default, PartialEq)]
pub struct TurnBudgetsConfig {
    pub foreground: TurnBudgetOverrides,
    pub autonomous: TurnBudgetOverrides,
    pub worker: TurnBudgetOverrides,
}

/// Parse `turn_budget.<role>.<field>` keys. Invalid values warn and keep
/// the default (parity with shell.* parsing). `Err` carries the diagnostic
/// the caller prints.
fn parse_turn_budget_config_key(
    budgets: &mut TurnBudgetsConfig,
    key: &str,
    val: &str,
) -> Result<(), String> {
    let Some(rest) = key.strip_prefix("turn_budget.") else {
        return Ok(());
    };
    let Some((role, field)) = rest.split_once('.') else {
        return Err(format!(
            "Warning: invalid turn_budget key '{key}' (expected turn_budget.<role>.<field>)"
        ));
    };
    let overrides = match role {
        "foreground" => &mut budgets.foreground,
        "autonomous" => &mut budgets.autonomous,
        "worker" => &mut budgets.worker,
        other => {
            return Err(format!(
                "Warning: unknown turn_budget role '{other}' (expected foreground|autonomous|worker)"
            ));
        }
    };
    macro_rules! set {
        ($slot:expr, $ty:ty) => {
            match val.parse::<$ty>() {
                Ok(parsed) => $slot = Some(parsed),
                Err(_) => {
                    return Err(format!("Warning: invalid value for {key}: '{val}', using default"))
                }
            }
        };
    }
    match field {
        "max_provider_rounds" => set!(overrides.max_provider_rounds, u32),
        "max_tool_calls" => set!(overrides.max_tool_calls, u32),
        "max_elapsed_secs" => set!(overrides.max_elapsed_secs, u64),
        "max_accumulated_tool_result_bytes" => {
            set!(overrides.max_accumulated_tool_result_bytes, usize)
        }
        "max_context_tokens" => set!(overrides.max_context_tokens, u64),
        "max_cost_usd" => set!(overrides.max_cost_usd, f64),
        "max_round_renewals" => set!(overrides.max_round_renewals, u32),
        other => return Err(format!("Warning: unknown turn_budget field '{other}'")),
    }
    Ok(())
}

/// Continuous-memory settings surface (Task A2, spec §12). Every field is
/// fail-closed: unknown or invalid values warn and keep the compiled default.
///
/// This struct contains continuous-memory policy; backend selection lives in
/// the separate `MemoryBackendConfig`.
/// Secret handling, retention, and project-scope rules are deliberately NOT
/// fields here — they are not configurable at all (spec §12: "Secret,
/// retention, and project rules are not configurable to fail open").
#[derive(Debug, Clone, PartialEq)]
pub struct MemoryConfig {
    /// Durable default memory mode. "off" unless the operator explicitly
    /// consents via `memory.default_mode_confirmed = true` in the same
    /// config parse pass (spec §12 operator-consent rule). Known values:
    /// off | recall_once | recall_each_prompt | capture_only |
    /// capture_and_recall (spec §6.1).
    pub default_mode: String,
    /// Operator-consent latch for `default_mode` (spec §12). Must be set to
    /// `true` in the same parse pass for a non-"off" `default_mode` to take
    /// effect; otherwise `default_mode` reverts to "off" with a warning.
    pub default_mode_confirmed: bool,
    /// Max records surfaced per recall (spec §10.3 budget).
    pub recall_max_records: u32,
    /// Max tokens surfaced per recall (spec §10.3 budget).
    pub recall_max_tokens: u32,
    /// Recall time budget in milliseconds (spec §16).
    pub recall_timeout_ms: u64,
    /// Tool-result capture policy: off | summary_only (spec §11).
    pub capture_tools: String,
    /// Capture assistant turns (spec §8.2).
    pub capture_assistant: bool,
    /// Capture user turns (spec §8.2).
    pub capture_user: bool,
    /// Background consolidation: off | on (spec §11.3, explicit opt-in).
    pub auto_consolidate: String,
    /// Local embedding models: off | on (spec §11.2, never implicit).
    pub local_embeddings: String,
    /// GLiNER entity extraction: off | on (spec §11.2, never implicit).
    pub gliner: String,
}

impl Default for MemoryConfig {
    fn default() -> Self {
        Self {
            default_mode: "off".to_string(),
            default_mode_confirmed: false,
            recall_max_records: 8,
            recall_max_tokens: 4096,
            recall_timeout_ms: 150,
            capture_tools: "summary_only".to_string(),
            capture_assistant: true,
            capture_user: true,
            auto_consolidate: "off".to_string(),
            local_embeddings: "off".to_string(),
            gliner: "off".to_string(),
        }
    }
}

/// Memory mode strings accepted by `memory.default_mode` (spec §6.1,
/// snake_case of `MemoryContextMode`). Anything else fails closed to the
/// current value — `default_mode` can never silently become a non-off mode
/// through an unrecognised string.
const KNOWN_MEMORY_MODES: &[&str] = &[
    "off",
    "recall_once",
    "recall_each_prompt",
    "capture_only",
    "capture_and_recall",
];

/// Parse `memory.<field>` keys (Task A2, spec §12). Invalid values warn and
/// keep the default (parity with turn_budget.* parsing) — never fail open.
/// `Err` carries the diagnostic the caller prints.
fn parse_memory_config_key(memory: &mut MemoryConfig, key: &str, val: &str) -> Result<(), String> {
    let Some(field) = key.strip_prefix("memory.") else {
        return Ok(());
    };
    /// Strict boolean: recognised forms parse; anything else warns and
    /// keeps the current (default) value.
    fn parse_bool(slot: &mut bool, key: &str, val: &str) -> Result<(), String> {
        match val {
            "true" | "1" | "yes" | "on" => *slot = true,
            "false" | "0" | "no" | "off" => *slot = false,
            other => {
                return Err(format!(
                    "Warning: invalid value for {key}: '{other}', expected true/false — using default"
                ))
            }
        }
        Ok(())
    }
    /// Closed string-enum: value must be in `allowed`, else warn and keep
    /// the current (default) value.
    fn parse_enum(slot: &mut String, key: &str, val: &str, allowed: &[&str]) -> Result<(), String> {
        if allowed.contains(&val) {
            *slot = val.to_string();
            Ok(())
        } else {
            Err(format!(
                "Warning: invalid value for {key}: '{val}', expected one of {} — using default",
                allowed.join("|")
            ))
        }
    }
    macro_rules! set_num {
        ($slot:expr, $ty:ty) => {
            match val.parse::<$ty>() {
                Ok(parsed) => {
                    $slot = parsed;
                    Ok(())
                }
                Err(_) => Err(format!("Warning: invalid value for {key}: '{val}', using default")),
            }
        };
    }
    match field {
        "default_mode" => parse_enum(&mut memory.default_mode, key, val, KNOWN_MEMORY_MODES),
        "default_mode_confirmed" => parse_bool(&mut memory.default_mode_confirmed, key, val),
        "recall_max_records" => set_num!(memory.recall_max_records, u32),
        "recall_max_tokens" => set_num!(memory.recall_max_tokens, u32),
        "recall_timeout_ms" => set_num!(memory.recall_timeout_ms, u64),
        "capture_tools" => parse_enum(
            &mut memory.capture_tools,
            key,
            val,
            &["off", "summary_only"],
        ),
        "capture_assistant" => parse_bool(&mut memory.capture_assistant, key, val),
        "capture_user" => parse_bool(&mut memory.capture_user, key, val),
        "auto_consolidate" => parse_enum(&mut memory.auto_consolidate, key, val, &["off", "on"]),
        "local_embeddings" => parse_enum(&mut memory.local_embeddings, key, val, &["off", "on"]),
        "gliner" => parse_enum(&mut memory.gliner, key, val, &["off", "on"]),
        other => Err(format!("Warning: unknown memory field '{other}'")),
    }
}

/// Host-owned note storage selection, independent of continuous-memory consent.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub enum MemoryBackendKind {
    #[default]
    Legacy,
    Axel,
    /// Invalid configuration must never select legacy storage implicitly.
    Unavailable,
}

#[derive(Debug, Clone, PartialEq, Eq, Default)]
pub struct MemoryBackendConfig {
    pub kind: MemoryBackendKind,
    /// Explicit absolute executable path; never resolved through PATH.
    pub executable: Option<PathBuf>,
    /// Optional absolute shared Axel brain path; absent uses the private user default.
    pub brain: Option<PathBuf>,
    /// Explicit host opt-in to user-wide notes. Never grants capture/history consent.
    pub user_scope: bool,
}

/// Parsed configuration from the config file.
#[derive(Debug, Clone)]
pub struct SynapsConfig {
    pub model: Option<String>,
    pub thinking_budget: Option<u32>,
    /// Named reasoning level, parsed from the same `thinking = …` key.
    /// When `Some`, this is the authoritative level. When `None`, fall back
    /// to `thinking_budget` for legacy numeric-only values.
    pub thinking_level: Option<crate::core::reasoning::ReasoningLevel>,
    pub context_window: Option<u64>, // override auto-detected context window (tokens)
    pub context_management: ContextManagementConfig,
    /// First-turn / cold-start behaviour (`startup.*`).
    pub startup: StartupConfig,
    /// Daemon lifetime knobs (`daemon.*`); env vars still win.
    pub daemon: DaemonConfig,
    /// Subagent fan-out limits (`subagent.*`).
    pub subagent: SubagentLimits,
    pub compaction_model: Option<String>, // model used for /compact (default: claude-sonnet-4-6)
    /// Where compaction summarization runs (spec §9.4): remote provider or
    /// local-only (zero network construction).
    pub compaction_mode: crate::core::compaction::CompactionMode,
    /// Content classes excluded from remote compaction disclosure.
    pub compaction_exclude: Vec<crate::core::compaction::ContentClass>,
    pub max_tool_output: usize,  // default 30000
    pub bash_timeout: u64,       // default 30
    pub bash_max_timeout: u64,   // default 300
    pub subagent_timeout: u64,   // default 300
    pub api_retries: u32,        // default 3
    pub refusal_retries: u32,    // default 2 — retries on stop_reason=refusal
    pub telemetry: String,       // off | basic | full (default off)
    pub cache_diagnostics: bool, // opt into cache-diagnosis beta (default false)
    /// Prompt-cache TTL strategy: "5m" (default) | "1h" | "hybrid".
    pub cache_ttl: CacheTtl,
    /// Prompt-cache keep-warm while idle (`cache_keepwarm`): `off` (default)
    /// | `auto` | `<N>h`. See [`CacheKeepWarm`] and
    /// docs/specs/cache-ttl-spec.md §7.
    pub cache_keepwarm: CacheKeepWarm,
    /// Longest an `auto` keep-warm idle period may run, in hours
    /// (`cache_keepwarm_auto_max_hours`, 1–48, default
    /// [`DEFAULT_CACHE_KEEPWARM_AUTO_MAX_HOURS`]). An explicit `<N>h` mode
    /// is its own window and ignores this.
    pub cache_keepwarm_auto_max_hours: u32,
    /// Max TUI redraw rate in frames/sec — caps streaming redraws (e.g. 60,
    /// 144, 240). User input always redraws immediately regardless. Default
    /// 60. Range 1–1000. The frame budget is `1000 / max_fps` ms.
    pub max_fps: u32,
    /// Lines to scroll per mouse-wheel event. Different terminal emulators
    /// emit 1–9+ scroll events per physical notch; set this to compensate.
    /// Default: 3. Range 1–20.
    pub scroll_lines: Option<u16>,
    pub theme: Option<String>,
    /// Animated theme transitions: `"on"` (350 ms cross-fade, default),
    /// `"off"` (instant snap), or integer milliseconds (0–2000).
    pub theme_transition: ThemeTransitionMode,
    /// Whether the TUI paints its own opaque background. `false` preserves the terminal background.
    pub tui_background_opaque: bool,
    /// Whether the prompt shows a glow sweeping across it while a turn streams. Default off.
    pub tui_streaming_glow: bool,
    /// Run the daemon, bash tool commands and PTY shells each in their own
    /// systemd scope (Linux, when a systemd user manager is reachable), so the
    /// out-of-memory killer can stop one runaway command instead of the whole
    /// terminal scope with the daemon in it. `process_scopes = off` disables;
    /// env `SYNAPS_PROCESS_SCOPES` overrides. Default on.
    pub process_scopes: bool,
    pub agent_name: Option<String>,
    pub identity: Option<String>,
    pub disabled_plugins: Vec<String>,
    pub favorite_models: Vec<String>,
    pub disabled_skills: Vec<String>,
    /// Opt-in progressive tool disclosure (Task 18). When false, providers
    /// receive the existing full tool schema byte-for-byte. When true, each
    /// stream starts with the small essential local core plus discovery and
    /// authorization gateways; exact activations are added per session.
    pub progressive_tool_disclosure: bool,
    /// Host confirmation policy for MODEL-INITIATED `activate_tools`
    /// (`tools.activation_confirm`). `Auto` (default) authorizes without
    /// prompting; `Prompt` asks the host (y/n confirm dialog); `Deny` never
    /// authorizes (locked-down hosts). `server.auto_approve_confirms = true`
    /// still authorizes regardless of this key.
    pub tools_activation_confirm: ActivationConfirm,
    /// `tools.deferred_loading` (default on). With progressive disclosure on
    /// the native Anthropic transport, every activatable tool is sent from the
    /// first request with `defer_loading: true` and `activate_tools` answers
    /// with `tool_reference` blocks, so an activation never changes the cached
    /// prompt prefix. `off` restores the per-activation tools-array change.
    pub tools_deferred_loading: bool,
    /// Opt-in session persistence strategy (Task 35, spec §9.8). `Json`
    /// (default) is the unchanged legacy full-rewrite path; `Journal` adds
    /// an append-only delta journal with periodic atomic snapshots. See
    /// docs/decisions/T35-session-journal-opt-in.md.
    pub session_persistence: crate::core::session_journal::SessionPersistence,
    /// Built-in tools to disable by runtime name (e.g. "bash", "ls"). Removed
    /// from the registry at boot so they're never offered to the model.
    pub disabled_tools: Vec<String>,
    pub shell: ShellConfig,
    pub server: ServerConfig,
    pub bridge: BridgeConfig,
    pub auth: AuthConfig,
    pub events: EventsConfig,
    pub provider_keys: BTreeMap<String, String>,
    pub keybinds: std::collections::HashMap<String, String>,
    /// Typed per-role turn budgets (Task 23, spec §8.1).
    pub turn_budgets: TurnBudgetsConfig,
    /// Continuous-memory settings surface (Task A2, spec §12).
    pub memory: MemoryConfig,
    /// Host-owned backend; selecting it does not enable recall or capture.
    pub memory_backend: MemoryBackendConfig,
    /// Non-fatal problems found while parsing the config file (unknown keys,
    /// unparseable values). Surfaced once at startup — never block boot.
    pub warnings: Vec<String>,
}

impl Default for SynapsConfig {
    fn default() -> Self {
        Self {
            model: None,
            thinking_budget: None,
            thinking_level: None,
            context_window: None,
            context_management: ContextManagementConfig::default(),
            startup: StartupConfig::default(),
            daemon: DaemonConfig::default(),
            subagent: SubagentLimits::default(),
            compaction_model: None,
            compaction_mode: crate::core::compaction::CompactionMode::default(),
            compaction_exclude: Vec::new(),
            max_tool_output: 30000,
            bash_timeout: 30,
            bash_max_timeout: 300,
            subagent_timeout: 300,
            api_retries: 3,
            refusal_retries: 2,
            telemetry: "off".to_string(),
            cache_diagnostics: false,
            cache_ttl: CacheTtl::default(),
            cache_keepwarm: CacheKeepWarm::Off,
            cache_keepwarm_auto_max_hours: DEFAULT_CACHE_KEEPWARM_AUTO_MAX_HOURS,
            max_fps: 60,
            scroll_lines: None,
            theme: None,
            theme_transition: ThemeTransitionMode::default(),
            tui_background_opaque: true,
            tui_streaming_glow: false,
            process_scopes: true,
            agent_name: None,
            identity: None,
            disabled_plugins: Vec::new(),
            favorite_models: Vec::new(),
            disabled_skills: Vec::new(),
            progressive_tool_disclosure: false,
            tools_activation_confirm: ActivationConfirm::default(),
            tools_deferred_loading: true,
            session_persistence: crate::core::session_journal::SessionPersistence::default(),
            disabled_tools: Vec::new(),
            shell: ShellConfig::default(),
            server: ServerConfig::default(),
            bridge: BridgeConfig::default(),
            auth: AuthConfig::default(),
            events: EventsConfig::default(),
            provider_keys: BTreeMap::new(),
            keybinds: std::collections::HashMap::new(),
            turn_budgets: TurnBudgetsConfig::default(),
            memory: MemoryConfig::default(),
            memory_backend: MemoryBackendConfig::default(),
            warnings: Vec::new(),
        }
    }
}

/// Known top-level config keys — used for unknown-key warnings + did-you-mean.
/// Public so the /settings coverage test can require a settings row (or an
/// explicit exclusion) for every key here.
pub const KNOWN_CONFIG_KEYS: &[&str] = &[
    "model",
    "thinking",
    "compaction_model",
    "compaction_mode",
    "compaction_exclude",
    "context_window",
    "context_management.mode",
    "context_management.pressure_tokens",
    "context_management.rollover_tokens",
    "context_management.reserve_tokens",
    "context_management.finish_rounds",
    "startup.quick_start",
    "startup.extensions_ready_timeout_secs",
    "daemon.idle_exit_secs",
    "daemon.prompt_abandon_secs",
    "daemon.parked_evict_secs",
    "max_tool_output",
    "bash_timeout",
    "bash_max_timeout",
    "subagent_timeout",
    "subagent.max_concurrent",
    "subagent.max_total",
    "subagent.max_depth",
    "api_retries",
    "refusal_retries",
    "telemetry",
    "cache_diagnostics",
    "cache_ttl",
    "cache_keepwarm",
    "cache_keepwarm_auto_max_hours",
    "max_fps",
    "scroll_lines",
    "theme",
    "theme_transition",
    "tui_background_opaque",
    "tui_streaming_glow",
    "process_scopes",
    "agent_name",
    "identity",
    "disabled_plugins",
    "favorite_models",
    "disabled_skills",
    "disabled_tools",
    "progressive_tool_disclosure",
    "tools.activation_confirm",
    "tools.deferred_loading",
    "session_persistence",
    "sidecar_toggle_key",
];

/// Every key accepted by the namespaced family parsers that is NOT in
/// [`KNOWN_CONFIG_KEYS`] (`shell.*`, `events.*`, `turn_budget.*`,
/// `memory.*`, `server.*`, `bridge.*`, `auth.*`). Open-ended families whose
/// suffix is user-chosen are listed as `prefix.*`. Keep this in sync when a
/// parser learns a key: the /settings coverage test requires each entry to
/// have a settings row or an explicit exclusion.
pub const FAMILY_CONFIG_KEYS: &[&str] = &[
    // parse_shell_config_key
    "shell.max_sessions",
    "shell.idle_timeout",
    "shell.readiness_timeout_ms",
    "shell.max_readiness_timeout_ms",
    "shell.default_rows",
    "shell.default_cols",
    "shell.readiness_strategy",
    "shell.max_output",
    // parse_events_config_key
    "events.auto_turn",
    "events.auto_turn_cap",
    // parse_turn_budget_config_key: turn_budget.<role>.<field>
    "turn_budget.foreground.max_provider_rounds",
    "turn_budget.foreground.max_tool_calls",
    "turn_budget.foreground.max_elapsed_secs",
    "turn_budget.foreground.max_accumulated_tool_result_bytes",
    "turn_budget.foreground.max_context_tokens",
    "turn_budget.foreground.max_cost_usd",
    "turn_budget.foreground.max_round_renewals",
    "turn_budget.autonomous.max_provider_rounds",
    "turn_budget.autonomous.max_tool_calls",
    "turn_budget.autonomous.max_elapsed_secs",
    "turn_budget.autonomous.max_accumulated_tool_result_bytes",
    "turn_budget.autonomous.max_context_tokens",
    "turn_budget.autonomous.max_cost_usd",
    "turn_budget.autonomous.max_round_renewals",
    "turn_budget.worker.max_provider_rounds",
    "turn_budget.worker.max_tool_calls",
    "turn_budget.worker.max_elapsed_secs",
    "turn_budget.worker.max_accumulated_tool_result_bytes",
    "turn_budget.worker.max_context_tokens",
    "turn_budget.worker.max_cost_usd",
    "turn_budget.worker.max_round_renewals",
    // memory backend (top-level arms of apply_config_content)
    "memory.backend",
    "memory.user_scope",
    "memory.axel.executable",
    "memory.axel.brain",
    // parse_memory_config_key
    "memory.default_mode",
    "memory.default_mode_confirmed",
    "memory.recall_max_records",
    "memory.recall_max_tokens",
    "memory.recall_timeout_ms",
    "memory.capture_tools",
    "memory.capture_assistant",
    "memory.capture_user",
    "memory.auto_consolidate",
    "memory.local_embeddings",
    "memory.gliner",
    // parse_server_config_key
    "server.allowed_origins",
    "server.token",
    "server.auto_approve_confirms",
    "server.max_message_size",
    // parse_bridge_config_key
    "bridge.uds_path",
    "bridge.heartbeat_mirror",
    "bridge.heartbeat_timeout_ms",
    // parse_auth_config_key
    "auth.remote_endpoint",
    "auth.machine_token",
    // open-ended families
    "provider.*",
    "keybind.*",
];

/// Simple Levenshtein distance for did-you-mean suggestions.
fn levenshtein(a: &str, b: &str) -> usize {
    let a: Vec<char> = a.chars().collect();
    let b: Vec<char> = b.chars().collect();
    let mut prev: Vec<usize> = (0..=b.len()).collect();
    let mut cur = vec![0; b.len() + 1];
    for (i, ca) in a.iter().enumerate() {
        cur[0] = i + 1;
        for (j, cb) in b.iter().enumerate() {
            let cost = if ca == cb { 0 } else { 1 };
            cur[j + 1] = (prev[j + 1] + 1).min(cur[j] + 1).min(prev[j] + cost);
        }
        std::mem::swap(&mut prev, &mut cur);
    }
    prev[b.len()]
}

/// Closest known key within edit distance 2, for typo suggestions.
fn did_you_mean(key: &str) -> Option<&'static str> {
    KNOWN_CONFIG_KEYS
        .iter()
        .map(|k| (*k, levenshtein(key, k)))
        .filter(|(_, d)| *d <= 2)
        .min_by_key(|(_, d)| *d)
        .map(|(k, _)| k)
}

// parse_thinking_budget replaced by ThinkingSpec::parse in apply_config_content.

fn parse_comma_list(val: &str) -> Vec<String> {
    val.split(',')
        .map(|s| s.trim().to_string())
        .filter(|s| !s.is_empty())
        .collect()
}

fn write_comma_list_locked(key: &str, values: &[String]) -> std::io::Result<()> {
    write_config_value_locked(key, &values.join(", "))
}

/// Parse shell.* configuration keys and update the ShellConfig. `Err`
/// carries the diagnostic the caller prints.
fn parse_shell_config_key(shell_config: &mut ShellConfig, key: &str, val: &str) -> Result<(), String> {
    let invalid = || format!("Warning: invalid value for {key}: '{val}', using default");
    match key {
        "shell.max_sessions" => {
            shell_config.max_sessions = val.parse::<usize>().map_err(|_| invalid())?;
        }
        "shell.idle_timeout" => {
            let timeout = val.parse::<u64>().map_err(|_| invalid())?;
            shell_config.idle_timeout = std::time::Duration::from_secs(timeout);
        }
        "shell.readiness_timeout_ms" => {
            shell_config.readiness_timeout_ms = val.parse::<u64>().map_err(|_| invalid())?;
        }
        "shell.max_readiness_timeout_ms" => {
            shell_config.max_readiness_timeout_ms = val.parse::<u64>().map_err(|_| invalid())?;
        }
        "shell.default_rows" => {
            shell_config.default_rows = val.parse::<u16>().map_err(|_| invalid())?;
        }
        "shell.default_cols" => {
            shell_config.default_cols = val.parse::<u16>().map_err(|_| invalid())?;
        }
        "shell.readiness_strategy" => {
            let val_lower = val.to_lowercase();
            match val_lower.as_str() {
                "timeout" | "prompt" | "hybrid" => {
                    shell_config.readiness_strategy = val.to_string();
                }
                _ => return Err(invalid()),
            }
        }
        "shell.max_output" => {
            shell_config.max_output = val.parse::<usize>().map_err(|_| invalid())?;
        }
        _ => {
            // Unknown shell.* keys are preserved (not rejected)
        }
    }
    Ok(())
}

/// Parse server.* configuration keys and update the ServerConfig.
#[allow(clippy::collapsible_match)]
fn parse_server_config_key(server_config: &mut ServerConfig, key: &str, val: &str) {
    match key {
        "server.allowed_origins" => {
            server_config.allowed_origins = parse_comma_list(val);
        }
        "server.token" => {
            if !val.is_empty() {
                server_config.token = Some(val.to_string());
            }
        }
        "server.auto_approve_confirms" => {
            server_config.auto_approve_confirms = matches!(val, "true" | "1" | "yes");
        }
        "server.max_message_size" => {
            if let Ok(size) = val.parse::<usize>() {
                server_config.max_message_size = Some(size);
            } else {
                eprintln!(
                    "Warning: invalid value for server.max_message_size: '{}', ignored",
                    val
                );
            }
        }
        _ => {
            // Unknown server.* keys preserved (not rejected)
        }
    }
}

/// Parse bridge.* configuration keys and update the BridgeConfig.
fn parse_bridge_config_key(bridge_config: &mut BridgeConfig, key: &str, val: &str) {
    match key {
        "bridge.uds_path" => {
            if val.is_empty() {
                bridge_config.uds_path = None;
            } else {
                bridge_config.uds_path = Some(PathBuf::from(val));
            }
        }
        "bridge.heartbeat_mirror" => {
            bridge_config.heartbeat_mirror = matches!(val, "true" | "1" | "yes");
        }
        "bridge.heartbeat_timeout_ms" => {
            if let Ok(ms) = val.parse::<u64>() {
                bridge_config.heartbeat_timeout_ms = ms;
            } else {
                eprintln!(
                    "Warning: invalid value for bridge.heartbeat_timeout_ms: '{}', using default",
                    val
                );
            }
        }
        _ => {
            // Unknown bridge.* keys preserved (not rejected)
        }
    }
}

/// Parse auth.* configuration keys and update the AuthConfig.
fn parse_auth_config_key(auth_config: &mut AuthConfig, key: &str, val: &str) {
    let v = val.trim();
    match key {
        "auth.remote_endpoint" => {
            auth_config.remote_endpoint = if v.is_empty() {
                None
            } else {
                Some(v.to_string())
            };
        }
        "auth.machine_token" => {
            auth_config.machine_token = if v.is_empty() {
                None
            } else {
                Some(v.to_string())
            };
        }
        _ => {
            // Unknown auth.* keys preserved (not rejected)
        }
    }
}

/// Parse config from a raw string — useful for tests and embedded harnesses.
/// Does NOT write to `PROVIDER_KEYS` or `IDENTITY` OnceLocks.
pub fn load_config_from_str(content: &str) -> SynapsConfig {
    let mut config = SynapsConfig::default();
    apply_config_content(&mut config, content);
    config
}

/// Every problem the parser reports for `content`: the `warnings` surfaced
/// at startup plus the stderr-only diagnostics of the `shell.*`, `events.*`,
/// `turn_budget.*` and `memory.*` families. Pure — prints nothing and
/// touches no process state.
pub fn config_content_problems(content: &str) -> Vec<String> {
    let mut config = SynapsConfig::default();
    let mut problems = Vec::new();
    apply_config_content_with(&mut config, content, &mut |diagnostic: String| problems.push(diagnostic));
    problems.extend(config.warnings);
    problems
}

/// Check a `key = value` edit before it is written (the /settings modal).
///
/// Runs the real parser over the config file as it would look after
/// [`write_config_value`] and returns `Err` with the parser's own messages
/// for any problem the edit introduces — invalid values, and cross-key
/// rules such as `context_management` threshold ordering, `subagent`
/// concurrency vs total, or `memory.default_mode` without operator consent.
/// Problems already present before the edit are not blamed on it.
pub fn validate_config_edit(key: &str, value: &str) -> Result<(), String> {
    if key.contains(['=', '\n', '\r'])
        || value.contains(['\n', '\r'])
    {
        return Err("value must be a single line".to_string());
    }
    // The file the edit lands in (profile-aware, like `write_config_value`),
    // computed without `resolve_write_path`'s directory creation.
    let target = get_active_config_dir().join("config");
    let existing = std::fs::read_to_string(&target).unwrap_or_default();
    let before = config_content_problems(&existing);
    let after = config_content_problems(&replace_config_line(&existing, key, value));
    let introduced: Vec<String> = after.into_iter().filter(|p| !before.contains(p)).collect();
    if introduced.is_empty() {
        Ok(())
    } else {
        Err(introduced.join("; "))
    }
}

/// Parse the config file at ~/.synaps-cli/config (or profile variant).
/// Returns default config if file doesn't exist or can't be read.
pub fn load_config() -> SynapsConfig {
    let path = resolve_read_path("config");
    let mut config = SynapsConfig::default();

    let Ok(content) = std::fs::read_to_string(&path) else {
        return config;
    };

    apply_config_content(&mut config, &content);

    // Publish provider keys to the process-wide cache for the API router.
    // First writer wins (OnceLock) — subsequent load_config calls are no-ops.
    let _ = PROVIDER_KEYS.set(config.provider_keys.clone());

    // Publish identity to the process-wide cache for API system prompt preamble.
    let identity_val = config
        .identity
        .clone()
        .unwrap_or_else(|| DEFAULT_IDENTITY.to_string());
    let _ = IDENTITY.set(identity_val);

    config
}

/// Apply key=value config lines from `content` into `config`.
/// Shared by `load_config` (file path) and `load_config_from_str` (test helper).
fn apply_config_content(config: &mut SynapsConfig, content: &str) {
    // The shell/events/turn_budget/memory families report to stderr (not
    // `config.warnings`) — unchanged behaviour.
    apply_config_content_with(config, content, &mut |diagnostic: String| eprintln!("{diagnostic}"));
}

/// [`apply_config_content`] with the stderr-only family diagnostics routed
/// to `family_diagnostic` instead, so [`config_content_problems`] can see
/// every value the parser rejects.
fn apply_config_content_with(
    config: &mut SynapsConfig,
    content: &str,
    family_diagnostic: &mut dyn FnMut(String),
) {
    let mut invalid_context_management = false;
    let mut invalid_memory_backend = false;
    for line in content.lines() {
        let line = line.trim();
        if line.is_empty() || line.starts_with('#') {
            continue;
        }
        let Some((key, val)) = line.split_once('=') else {
            continue;
        };
        let key = key.trim();
        let val = val.trim();
        match key {
            "model" => config.model = Some(val.to_string()),
            "thinking" => {
                use crate::core::reasoning::ThinkingSpec;
                match ThinkingSpec::parse(val) {
                    Some(ThinkingSpec::Named(level)) => {
                        config.thinking_level = Some(level);
                        config.thinking_budget = level.to_legacy_budget();
                    }
                    Some(ThinkingSpec::Budget(budget)) => {
                        // Preserve exact legacy budgets; do not make the derived
                        // bucket authoritative over the user's token count.
                        config.thinking_level = None;
                        config.thinking_budget = Some(budget);
                    }
                    None => {
                        config.warnings.push(format!("thinking = {val} — expected off|adaptive|low|medium|high|xhigh|max|ultra|ultracode or a token count; thinking disabled"));
                    }
                }
            }
            "compaction_model" => config.compaction_model = Some(val.to_string()),
            "compaction_mode" => match val {
                "remote" => {
                    config.compaction_mode = crate::core::compaction::CompactionMode::Remote
                }
                "local" | "local_only" | "local-only" => {
                    config.compaction_mode = crate::core::compaction::CompactionMode::LocalOnly
                }
                _ => {
                    config.warnings.push(format!(
                        "compaction_mode = {val} — expected remote or local; ignored"
                    ));
                }
            },
            "compaction_exclude" => {
                let mut classes = Vec::new();
                for part in val.split(',').map(str::trim).filter(|p| !p.is_empty()) {
                    match crate::core::compaction::ContentClass::parse(part) {
                        Some(class) => {
                            if !classes.contains(&class) {
                                classes.push(class);
                            }
                        }
                        None => config.warnings.push(format!(
                            "compaction_exclude — unknown content class '{part}'; \
                             expected one of: user_text, assistant_text, thinking, \
                             tool_calls, tool_results, file_paths, event_data"
                        )),
                    }
                }
                config.compaction_exclude = classes;
            }
            // `auto` = model default (what /settings and `/context auto`
            // write): clears any override, no warning.
            "context_window" if val.eq_ignore_ascii_case("auto") => config.context_window = None,
            "context_window" => {
                let parsed = match val {
                    "200k" | "200K" => Some(200_000),
                    "1m" | "1M" => Some(1_000_000),
                    _ => val.parse::<u64>().ok(),
                };
                if parsed.is_none() {
                    config.warnings.push(format!(
                        "context_window = {val} — expected 200k, 1m, auto, or a token count; ignored"
                    ));
                }
                config.context_window = parsed;
            }
            "max_tool_output" => match val.parse::<usize>() {
                Ok(size) => config.max_tool_output = size,
                Err(_) => config.warnings.push(format!(
                    "max_tool_output = {val} — not a number; using {}",
                    config.max_tool_output
                )),
            },
            "bash_timeout" => match val.parse::<u64>() {
                Ok(t) if t >= 1 => config.bash_timeout = t,
                Ok(_) => config.warnings.push(format!(
                    "bash_timeout = {val} — below minimum (1s); using {}",
                    config.bash_timeout
                )),
                Err(_) => config.warnings.push(format!(
                    "bash_timeout = {val} — not a number; using {}",
                    config.bash_timeout
                )),
            },
            "bash_max_timeout" => {
                if let Ok(timeout) = val.parse::<u64>() {
                    config.bash_max_timeout = timeout;
                }
            }
            "subagent_timeout" => {
                if let Ok(timeout) = val.parse::<u64>() {
                    config.subagent_timeout = timeout;
                }
            }
            "api_retries" => {
                if let Ok(retries) = val.parse::<u32>() {
                    config.api_retries = retries;
                }
            }
            "refusal_retries" => {
                if let Ok(retries) = val.parse::<u32>() {
                    config.refusal_retries = retries;
                }
            }
            "telemetry" => config.telemetry = val.to_string(),
            "cache_diagnostics" => {
                config.cache_diagnostics = matches!(val, "true" | "1" | "on" | "yes");
            }
            "cache_ttl" => match CacheTtl::parse(val) {
                Some(ttl) => config.cache_ttl = ttl,
                None => config.warnings.push(format!(
                    "cache_ttl = {val} — expected 5m, 1h, or hybrid; using 5m"
                )),
            },
            "cache_keepwarm" => match CacheKeepWarm::parse(val) {
                Some(mode) => config.cache_keepwarm = mode,
                None => config.warnings.push(format!(
                    "cache_keepwarm = {val} — expected off, auto, or 1h–{MAX_CACHE_KEEPWARM_HOURS}h; keep-warm stays off"
                )),
            },
            "cache_keepwarm_auto_max_hours" => {
                match val.trim().trim_end_matches(['h', 'H']).parse::<u32>() {
                    Ok(h) if (1..=MAX_CACHE_KEEPWARM_HOURS).contains(&h) => {
                        config.cache_keepwarm_auto_max_hours = h
                    }
                    _ => config.warnings.push(format!(
                        "cache_keepwarm_auto_max_hours = {val} — expected 1–{MAX_CACHE_KEEPWARM_HOURS}; using {DEFAULT_CACHE_KEEPWARM_AUTO_MAX_HOURS}"
                    )),
                }
            }
            "max_fps" => match val.parse::<u32>() {
                Ok(fps) if (1..=1000).contains(&fps) => config.max_fps = fps,
                Ok(_) => config.warnings.push(format!(
                    "max_fps = {val} — expected 1–1000; using {}",
                    config.max_fps
                )),
                Err(_) => config.warnings.push(format!(
                    "max_fps = {val} — not a number; using {}",
                    config.max_fps
                )),
            },
            "scroll_lines" => match val.parse::<u16>() {
                Ok(n) if (1..=20).contains(&n) => config.scroll_lines = Some(n),
                Ok(_) => config
                    .warnings
                    .push(format!("scroll_lines = {val} — expected 1–20; ignoring")),
                Err(_) => config
                    .warnings
                    .push(format!("scroll_lines = {val} — not a number; ignoring")),
            },
            "theme" => config.theme = Some(val.to_string()),
            "theme_transition" => match ThemeTransitionMode::parse(val) {
                Some(mode) => config.theme_transition = mode,
                None => config.warnings.push(format!(
                    "theme_transition = {val} — expected on, off, or milliseconds (0–2000); using on"
                )),
            },
            "tui_background_opaque" => match val {
                "true" | "1" | "on" | "yes" | "opaque" => config.tui_background_opaque = true,
                "false" | "0" | "off" | "no" | "invisible" => config.tui_background_opaque = false,
                _ => config.warnings.push(format!(
                    "tui_background_opaque = {val} — expected opaque or invisible; using {}",
                    if config.tui_background_opaque {
                        "opaque"
                    } else {
                        "invisible"
                    }
                )),
            },
            "tui_streaming_glow" => match val {
                "true" | "1" | "on" | "yes" => config.tui_streaming_glow = true,
                "false" | "0" | "off" | "no" => config.tui_streaming_glow = false,
                _ => config.warnings.push(format!(
                    "tui_streaming_glow = {val} — expected on or off; using off"
                )),
            },
            "process_scopes" => match val {
                "true" | "1" | "on" | "yes" | "auto" => config.process_scopes = true,
                "false" | "0" | "off" | "no" => config.process_scopes = false,
                _ => config.warnings.push(format!(
                    "process_scopes = {val} — expected auto or off; using auto"
                )),
            },
            // Read directly by the keybind registry (`read_config_value`);
            // recognised here so the /settings row never trips the
            // unknown-key warning.
            "sidecar_toggle_key" => {}
            "agent_name" => config.agent_name = Some(val.to_string()),
            "identity" => config.identity = Some(val.to_string()),
            "disabled_plugins" => {
                config.disabled_plugins = parse_comma_list(val);
            }
            "favorite_models" => {
                config.favorite_models = parse_comma_list(val);
            }
            "disabled_skills" => {
                config.disabled_skills = parse_comma_list(val);
            }
            "progressive_tool_disclosure" => {
                config.progressive_tool_disclosure = matches!(val, "true" | "1" | "on" | "yes");
            }
            "tools.deferred_loading" => match val {
                "on" | "true" | "1" | "yes" => config.tools_deferred_loading = true,
                "off" | "false" | "0" | "no" => config.tools_deferred_loading = false,
                _ => config.warnings.push(format!(
                    "tools.deferred_loading = {val} — expected on or off; keeping the default (on)"
                )),
            },
            "tools.activation_confirm" => match ActivationConfirm::parse(val) {
                Some(mode) => config.tools_activation_confirm = mode,
                None => config.warnings.push(format!(
                    "tools.activation_confirm = {val} — expected auto, prompt or deny; \
                     keeping the default (auto)"
                )),
            },
            "session_persistence" => {
                match crate::core::session_journal::SessionPersistence::parse(val) {
                    Some(mode) => config.session_persistence = mode,
                    None => config.warnings.push(format!(
                        "session_persistence = {val} — expected json or journal; \
                         keeping the default (json)"
                    )),
                }
            }
            "disabled_tools" => {
                config.disabled_tools = parse_comma_list(val);
            }
            "memory.backend" => {
                config.memory_backend.kind = match val {
                    "legacy" => MemoryBackendKind::Legacy,
                    "axel" => MemoryBackendKind::Axel,
                    _ => {
                        invalid_memory_backend = true;
                        config.warnings.push(format!(
                            "memory.backend = {val} — expected legacy or axel; memory backend unavailable"
                        ));
                        MemoryBackendKind::Unavailable
                    }
                };
            }
            "memory.user_scope" => match val {
                "true" => config.memory_backend.user_scope = true,
                "false" => config.memory_backend.user_scope = false,
                _ => {
                    invalid_memory_backend = true;
                    config.warnings.push("memory.user_scope — expected true or false; memory backend unavailable".into());
                }
            },
            "memory.axel.executable" | "memory.axel.brain" => {
                let path = PathBuf::from(val);
                if !path.is_absolute() {
                    invalid_memory_backend = true;
                    config.warnings.push(format!(
                        "{key} — expected an absolute path; memory backend unavailable"
                    ));
                }
                // Retain invalid paths too: direct config consumers must not
                // mistake an invalid explicit path for an absent default.
                if key == "memory.axel.executable" {
                    config.memory_backend.executable = Some(path);
                } else {
                    config.memory_backend.brain = Some(path);
                }
            }
            _ => {
                // Handle namespaced keys
                if key.starts_with("shell.") {
                    if let Err(diagnostic) = parse_shell_config_key(&mut config.shell, key, val) {
                        family_diagnostic(diagnostic);
                    }
                } else if key.starts_with("server.") {
                    parse_server_config_key(&mut config.server, key, val);
                } else if key.starts_with("bridge.") {
                    parse_bridge_config_key(&mut config.bridge, key, val);
                } else if key.starts_with("auth.") {
                    parse_auth_config_key(&mut config.auth, key, val);
                } else if key.starts_with("events.") {
                    if let Err(diagnostic) = parse_events_config_key(&mut config.events, key, val)
                    {
                        family_diagnostic(diagnostic);
                    }
                } else if key.starts_with("turn_budget.") {
                    if let Err(diagnostic) =
                        parse_turn_budget_config_key(&mut config.turn_budgets, key, val)
                    {
                        family_diagnostic(diagnostic);
                    }
                } else if key.starts_with("memory.") {
                    if let Err(diagnostic) = parse_memory_config_key(&mut config.memory, key, val)
                    {
                        family_diagnostic(diagnostic);
                    }
                } else if key.starts_with("startup.") {
                    if let Err(reason) =
                        parse_startup_config_key(&mut config.startup, key, val)
                    {
                        config.warnings.push(format!("{key} — {reason}"));
                    }
                } else if key.starts_with("daemon.") {
                    if let Err(reason) =
                        parse_daemon_config_key(&mut config.daemon, key, val)
                    {
                        config.warnings.push(format!("{key} — {reason}"));
                    }
                } else if key.starts_with("subagent.") {
                    if let Err(reason) =
                        parse_subagent_config_key(&mut config.subagent, key, val)
                    {
                        config.warnings.push(format!("{key} — {reason}"));
                    }
                } else if key.starts_with("context_management.") {
                    if let Err(reason) = parse_context_management_config_key(
                        &mut config.context_management, key, val,
                    ) {
                        invalid_context_management = true;
                        config.warnings.push(format!("{key} — {reason}"));
                    }
                } else if let Some(provider_key) = key.strip_prefix("provider.") {
                    config
                        .provider_keys
                        .insert(provider_key.to_string(), val.to_string());
                } else if let Some(keybind_key) = key.strip_prefix("keybind.") {
                    config
                        .keybinds
                        .insert(keybind_key.to_string(), val.to_string());
                } else if key.contains('.') {
                    // Dotted keys are namespaced (plugin/extension config, e.g.
                    // `knowledge.jawz_notes`). Plugins define their own keys —
                    // not ours to police. Silently preserved.
                } else {
                    // Unknown top-level key — warn with a did-you-mean if close.
                    match did_you_mean(key) {
                        Some(suggestion) => config.warnings.push(format!(
                            "unknown key '{key}' (did you mean '{suggestion}'?)"
                        )),
                        None => config
                            .warnings
                            .push(format!("unknown key '{key}' — ignored")),
                    }
                }
            }
        }
    }

    // Never leave a partially parsed automatic policy enabled. Syntax errors
    // invalidate this whole parse pass, even if a later duplicate is valid.
    let context_validation = match config.context_window {
        Some(window) => config.context_management.validate_for_window(window),
        None => config.context_management.validate(),
    };
    if let Err(reason) = context_validation {
        invalid_context_management = true;
        config
            .warnings
            .push(format!("context_management — {reason}"));
    }
    // The delegation policy refuses concurrent > total, which would take
    // subagents away entirely. Keep the stricter number for both. Checked
    // after the loop so key order never matters.
    if config.subagent.max_concurrent > config.subagent.max_total {
        config.warnings.push(format!(
            "subagent.max_concurrent ({}) is above subagent.max_total ({}); using {} for both",
            config.subagent.max_concurrent, config.subagent.max_total, config.subagent.max_total
        ));
        config.subagent.max_concurrent = config.subagent.max_total;
    }
    if invalid_context_management {
        config.context_management = ContextManagementConfig::default();
        config.warnings.push(
            "invalid context_management configuration — using defaults (mode off)".to_string(),
        );
    }

    // Any invalid backend setting poisons this parse pass, regardless of key
    // order or later duplicate selectors. Never silently route to legacy.
    if invalid_memory_backend {
        config.memory_backend.kind = MemoryBackendKind::Unavailable;
    }

    // Fail-closed operator-consent rule (Task A2, spec §12): a non-"off"
    // `memory.default_mode` takes effect only when the operator also set
    // `memory.default_mode_confirmed = true` in this same parse pass.
    // Checked after the loop so key order never matters.
    if config.memory.default_mode != "off" && !config.memory.default_mode_confirmed {
        config.warnings.push(format!(
            "memory.default_mode = {} requires memory.default_mode_confirmed = true \
             in the same config; reverting to off",
            config.memory.default_mode
        ));
        config.memory.default_mode = "off".to_string();
    }

    // Derive max_message_size from context_window if not explicitly set.
    // Rough estimate: 1 token ≈ 4 bytes. Context window in tokens → bytes.
    if config.server.max_message_size.is_none() {
        if let Some(ctx_tokens) = config.context_window {
            config.server.max_message_size = Some((ctx_tokens as usize) * 4);
        }
    }
}

/// Read a single config value by exact key from the active config file.
pub fn read_config_value(key: &str) -> Option<String> {
    let path = resolve_read_path("config");
    let content = std::fs::read_to_string(&path).ok()?;
    for line in content.lines() {
        let line = line.trim();
        if line.is_empty() || line.starts_with('#') {
            continue;
        }
        let Some((k, v)) = line.split_once('=') else {
            continue;
        };
        if k.trim() == key.trim() {
            return Some(v.trim().to_string());
        }
    }
    None
}

/// Exclusive advisory lock on `<config>.lock`, held around every
/// read-modify-write of the config file (same pattern as `auth.json`).
/// Two writers (`/settings` in two processes, a `/model` favorite toggle
/// racing a settings edit) no longer lose each other's updates.
///
/// Held for the RMW only (< 1 ms); readers (`load_config`) never take it —
/// they already tolerate the atomic rename. `SYNAPS_CONFIG_LOCK=0` bypasses.
///
/// NOT reentrant: flock on a fresh fd of the same file from the same process
/// conflicts on Linux. Callers that already hold the guard must use the
/// `_locked` inner fns.
struct ConfigLock {
    _file: Option<std::fs::File>,
}

impl ConfigLock {
    fn acquire() -> std::io::Result<Self> {
        if std::env::var("SYNAPS_CONFIG_LOCK").as_deref() == Ok("0") {
            return Ok(Self { _file: None });
        }
        use fs4::fs_std::FileExt;
        let lock_path = resolve_write_path("config").with_extension("lock");
        if let Some(parent) = lock_path.parent() {
            std::fs::create_dir_all(parent)?;
        }
        let mut open = std::fs::OpenOptions::new();
        open.create(true).write(true).truncate(false);
        #[cfg(unix)]
        {
            use std::os::unix::fs::OpenOptionsExt;
            open.mode(0o600);
        }
        let file = open.open(&lock_path)?;
        FileExt::lock_exclusive(&file)?;
        Ok(Self { _file: Some(file) })
    }
}

/// Write a single `key = value` pair to `~/.synaps-cli/config` (or profile config).
/// Replaces the first existing line that matches the key, or appends if absent.
/// Preserves comments and unknown keys. Writes atomically via temp file + rename.
pub fn write_config_value(key: &str, value: &str) -> std::io::Result<()> {
    let _guard = ConfigLock::acquire()?;
    write_config_value_locked(key, value)
}

/// The RMW body; caller holds [`ConfigLock`].
fn write_config_value_locked(key: &str, value: &str) -> std::io::Result<()> {
    let path = resolve_write_path("config");
    let existing = std::fs::read_to_string(&path).unwrap_or_default();
    let out = replace_config_line(&existing, key, value);

    let tmp = path.with_extension("tmp");
    std::fs::write(&tmp, out)?;
    // Config may contain API keys — restrict to owner-only
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        std::fs::set_permissions(&tmp, std::fs::Permissions::from_mode(0o600))?;
    }
    std::fs::rename(&tmp, &path)?;
    Ok(())
}

/// `existing` with the first `key = …` line replaced by `key = value` (or
/// the pair appended), comments and unknown keys preserved — exactly what
/// [`write_config_value`] writes.
fn replace_config_line(existing: &str, key: &str, value: &str) -> String {
    let key_trimmed = key.trim();
    let replacement = format!("{} = {}", key_trimmed, value);

    let mut found = false;
    let mut new_lines: Vec<String> = existing
        .lines()
        .map(|line| {
            if found {
                return line.to_string();
            }
            let t = line.trim_start();
            if t.starts_with('#') || t.is_empty() {
                return line.to_string();
            }
            if let Some((k, _)) = t.split_once('=') {
                if k.trim() == key_trimmed {
                    found = true;
                    return replacement.clone();
                }
            }
            line.to_string()
        })
        .collect();

    if !found {
        new_lines.push(replacement);
    }

    let mut out = new_lines.join("\n");
    if !out.ends_with('\n') {
        out.push('\n');
    }
    out
}

/// Add a favorite model id (`provider/model`) to config, preserving sort/dedup.
pub fn add_favorite_model(id: &str) -> std::io::Result<()> {
    let trimmed = id.trim();
    if trimmed.is_empty() {
        return Ok(());
    }
    let _guard = ConfigLock::acquire()?;
    let mut values = load_config().favorite_models;
    if !values.iter().any(|v| v == trimmed) {
        values.push(trimmed.to_string());
        values.sort();
    }
    write_comma_list_locked("favorite_models", &values)
}

/// Remove a favorite model id (`provider/model`) from config.
pub fn remove_favorite_model(id: &str) -> std::io::Result<()> {
    let _guard = ConfigLock::acquire()?;
    let mut values = load_config().favorite_models;
    values.retain(|v| v != id.trim());
    write_comma_list_locked("favorite_models", &values)
}

/// Return whether a model id is marked as favorite.
pub fn is_favorite_model(id: &str) -> bool {
    load_config().favorite_models.iter().any(|v| v == id.trim())
}

/// Whether a key matches the secret denylist (case-insensitive).
/// Used by the journal save path to ensure secret values never reach disk,
/// and by the client env capture to strip secrets before `Hello`.
pub fn is_secret_key(key: &str) -> bool {
    let upper = key.to_ascii_uppercase();
    upper.ends_with("_KEY")
        || upper.ends_with("_TOKEN")
        || upper.ends_with("_CREDENTIALS")
        || upper.ends_with("_API_KEY")
        || upper.contains("SECRET")
        || upper.contains("PASSWORD")
        || upper.contains("PASSWD")
        || upper.ends_with("_PAT")
        || upper.ends_with("_DSN")
}

/// Whether an env VALUE carries a credential regardless of its key name:
/// any URL with userinfo (`scheme://user:pass@host`, `scheme://key@host`),
/// anywhere in the value — `DATABASE_URL`, `HTTPS_PROXY`, a Sentry DSN or a
/// JDBC option string all qualify. The key-name denylist alone missed these,
/// so their credentials reached the daemon and the session files on disk.
/// A username-only URL (`ssh://git@host/…`) is treated as a secret too:
/// rare in an environment, and failing safe beats a guess.
pub fn is_secret_env_value(value: &str) -> bool {
    let mut rest = value;
    while let Some(i) = rest.find("://") {
        let scheme_ok = rest[..i]
            .chars()
            .next_back()
            .is_some_and(|c| c.is_ascii_alphanumeric());
        let after = &rest[i + 3..];
        // The authority ends at the path, query or fragment, or at a list /
        // option separator when several URLs share one value.
        let end = after
            .find(|c: char| {
                matches!(c, '/' | '?' | '#' | ',' | ';' | '"' | '\'') || c.is_whitespace()
            })
            .unwrap_or(after.len());
        if scheme_ok && after[..end].rfind('@').is_some_and(|at| at > 0) {
            return true;
        }
        rest = after;
    }
    false
}

/// Whether an env pair must never reach the daemon or disk: a secret key
/// name OR a value carrying credentials (see [`is_secret_env_value`]).
pub fn is_secret_env(key: &str, value: &str) -> bool {
    is_secret_key(key) || is_secret_env_value(value)
}

/// Resolve the system prompt from CLI flag, config file, or default.
/// Priority: explicit value > ~/.synaps-cli/system.md > built-in default.
pub fn resolve_system_prompt(explicit: Option<&str>) -> String {
    #[cfg(windows)]
    const DEFAULT_PROMPT: &str = "You are a helpful AI agent running in a terminal on Windows. \
        You have access to powershell, bash, read, and write tools. \
        Prefer the powershell tool for system commands and filesystem operations — it is native \
        to Windows and avoids quoting/path translation issues. \
        Use bash only when the task specifically requires WSL or a Unix environment. \
        Be concise and direct. Use tools when the user asks you to interact with the filesystem or run commands.";
    #[cfg(not(windows))]
    const DEFAULT_PROMPT: &str = "You are a helpful AI agent running in a terminal. \
        You have access to bash, read, and write tools. \
        Be concise and direct. Use tools when the user asks you to interact with the filesystem or run commands.";

    if let Some(val) = explicit {
        let path = std::path::Path::new(val);
        if path.exists() && path.is_file() {
            return std::fs::read_to_string(path).unwrap_or_else(|_| val.to_string());
        }
        return val.to_string();
    }

    let system_path = resolve_read_path("system.md");
    if system_path.exists() {
        return std::fs::read_to_string(&system_path).unwrap_or_default();
    }

    DEFAULT_PROMPT.to_string()
}

#[cfg(test)]
mod tests {
    #[test]
    fn tools_deferred_loading_defaults_on_and_parses() {
        assert!(super::load_config_from_str("").tools_deferred_loading);
        assert!(
            !super::load_config_from_str("tools.deferred_loading = off\n").tools_deferred_loading
        );
        let bad = super::load_config_from_str("tools.deferred_loading = maybe\n");
        assert!(
            bad.tools_deferred_loading,
            "invalid value keeps the default"
        );
        assert!(bad
            .warnings
            .iter()
            .any(|w| w.contains("tools.deferred_loading")));
    }

    #[test]
    fn secret_env_value_detects_credential_urls() {
        use super::is_secret_env_value as v;
        // user:password in the authority
        assert!(v("postgres://app:hunter2@db.internal:5432/prod"));
        assert!(v("redis://:pw@cache:6379/0"));
        assert!(v("http://user:pass@proxy.corp:3128"));
        assert!(v(
            "mongodb+srv://u:p@cluster0.example.net/db?retryWrites=true"
        ));
        // a key as the username, no password (Sentry DSN)
        assert!(v("https://abc123def456@o1.ingest.sentry.io/42"));
        // anywhere in the value, not only at the start; lists
        assert!(v("-Dspring.datasource.url=jdbc:postgresql://u:p@h/db"));
        assert!(v("redis://h1:6379,redis://u:p@h2:6379"));
        // no userinfo → not a secret
        assert!(!v("https://api.example.com/v1/items?q=a@b"));
        assert!(!v("http://host/path/with@sign"));
        assert!(!v("https://@host/empty-userinfo"));
        assert!(!v("git@github.com:org/repo.git"));
        assert!(!v("mailto:someone@example.com"));
        assert!(!v("someone@example.com"));
        assert!(!v("/usr/local/bin:/usr/bin"));
        assert!(!v(""));
    }

    #[test]
    fn secret_key_covers_pat_and_dsn() {
        assert!(super::is_secret_key("GITHUB_PAT"));
        assert!(super::is_secret_key("gh_pat"));
        assert!(super::is_secret_key("SENTRY_DSN"));
        assert!(!super::is_secret_key("PATH"));
        assert!(!super::is_secret_key("PATTERN_DIR"));
    }

    #[test]
    fn secret_env_is_key_or_value() {
        assert!(super::is_secret_env(
            "DATABASE_URL",
            "postgres://app:hunter2@db/prod"
        ));
        assert!(super::is_secret_env("GH_TOKEN", "anything"));
        assert!(!super::is_secret_env("DATABASE_URL", "postgres://db/prod"));
        assert!(!super::is_secret_env("HOME", "/home/u"));
    }
    #[test]
    fn startup_and_daemon_defaults() {
        let c = super::load_config_from_str("");
        assert!(c.startup.quick_start, "quick_start defaults ON");
        assert_eq!(c.startup.extensions_ready_timeout_secs, 30);
        assert_eq!(c.daemon.idle_exit_secs, 10);
        assert_eq!(c.daemon.prompt_abandon_secs, 3600);
        assert_eq!(c.daemon.parked_evict_secs, 3600);
        // No warnings for the absent keys.
        assert!(c.warnings.is_empty(), "warnings: {:?}", c.warnings);
    }

    #[test]
    fn startup_and_daemon_parse_all_keys() {
        let c = super::load_config_from_str(concat!(
            "startup.quick_start = off\n",
            "startup.extensions_ready_timeout_secs = 45\n",
            "daemon.idle_exit_secs = 20\n",
            "daemon.prompt_abandon_secs = 0\n",
            "daemon.parked_evict_secs = 120\n",
        ));
        assert!(!c.startup.quick_start);
        assert_eq!(c.startup.extensions_ready_timeout_secs, 45);
        assert_eq!(c.daemon.idle_exit_secs, 20);
        assert_eq!(c.daemon.prompt_abandon_secs, 0);
        assert_eq!(c.daemon.parked_evict_secs, 120);
        assert!(
            !c.warnings.iter().any(|w| w.contains("unknown")),
            "no unknown-key warning: {:?}",
            c.warnings
        );
    }

    #[test]
    fn subagent_limits_default_to_16_64_4() {
        let c = super::load_config_from_str("");
        assert_eq!(c.subagent, super::SubagentLimits::default());
        assert_eq!(c.subagent.max_concurrent, 16);
        assert_eq!(c.subagent.max_total, 64);
        assert_eq!(c.subagent.max_depth, 4);
        assert!(c.warnings.is_empty(), "warnings: {:?}", c.warnings);
    }

    #[test]
    fn subagent_limits_parse_and_are_known_keys() {
        let c = super::load_config_from_str(concat!(
            "subagent.max_concurrent = 24\n",
            "subagent.max_total = 100\n",
            "subagent.max_depth = 2\n",
            "subagent_timeout = 600\n",
        ));
        assert_eq!(c.subagent.max_concurrent, 24);
        assert_eq!(c.subagent.max_total, 100);
        assert_eq!(c.subagent.max_depth, 2);
        assert_eq!(c.subagent_timeout, 600, "the old flat key is unaffected");
        assert!(c.warnings.is_empty(), "warnings: {:?}", c.warnings);
        for k in [
            "subagent.max_concurrent",
            "subagent.max_total",
            "subagent.max_depth",
        ] {
            assert!(
                super::KNOWN_CONFIG_KEYS.contains(&k),
                "{k} not in KNOWN_CONFIG_KEYS"
            );
        }
    }

    #[test]
    fn subagent_limits_reject_zero_and_junk_and_keep_defaults() {
        let c = super::load_config_from_str(concat!(
            "subagent.max_concurrent = 0\n",
            "subagent.max_total = lots\n",
            "subagent.max_depth = 70000\n",
            "subagent.max_children = 4\n",
        ));
        assert_eq!(c.subagent, super::SubagentLimits::default());
        for key in [
            "subagent.max_concurrent",
            "subagent.max_total",
            "subagent.max_depth",
            "subagent.max_children",
        ] {
            assert!(
                c.warnings.iter().any(|w| w.starts_with(key)),
                "expected a warning for {key}: {:?}",
                c.warnings
            );
        }
    }

    #[test]
    fn subagent_concurrency_above_total_uses_the_stricter_number() {
        // Either key order: the check runs after the whole file is parsed.
        for text in [
            "subagent.max_total = 10\nsubagent.max_concurrent = 32\n",
            "subagent.max_concurrent = 32\nsubagent.max_total = 10\n",
        ] {
            let c = super::load_config_from_str(text);
            assert_eq!(c.subagent.max_concurrent, 10);
            assert_eq!(c.subagent.max_total, 10);
            assert!(
                c.warnings
                    .iter()
                    .any(|w| w.contains("subagent.max_concurrent (32)")),
                "{:?}",
                c.warnings
            );
        }
        // Lowering only the total below the default concurrency also clamps.
        let c = super::load_config_from_str("subagent.max_total = 5\n");
        assert_eq!(c.subagent.max_concurrent, 5);
    }

    #[test]
    fn process_scopes_defaults_on_and_parses_auto_and_off() {
        assert!(super::load_config_from_str("").process_scopes);
        assert!(super::load_config_from_str("process_scopes = auto\n").process_scopes);
        let off = super::load_config_from_str("process_scopes = off\n");
        assert!(!off.process_scopes);
        assert!(off.warnings.is_empty(), "{:?}", off.warnings);
        let bad = super::load_config_from_str("process_scopes = sometimes\n");
        assert!(bad.process_scopes, "an invalid value keeps the default");
        assert!(bad.warnings.iter().any(|w| w.starts_with("process_scopes")));
        assert!(super::KNOWN_CONFIG_KEYS.contains(&"process_scopes"));
    }

    #[test]
    fn startup_quick_start_accepts_on() {
        let c = super::load_config_from_str("startup.quick_start = on\n");
        assert!(c.startup.quick_start);
    }

    #[test]
    fn startup_and_daemon_keys_are_known() {
        for k in [
            "startup.quick_start",
            "startup.extensions_ready_timeout_secs",
            "daemon.idle_exit_secs",
            "daemon.prompt_abandon_secs",
            "daemon.parked_evict_secs",
        ] {
            assert!(super::KNOWN_CONFIG_KEYS.contains(&k), "{k} not in KNOWN_CONFIG_KEYS");
        }
    }

    #[test]
    fn startup_daemon_bad_values_warn_and_keep_defaults() {
        let c = super::load_config_from_str(concat!(
            "startup.quick_start = maybe\n",
            "daemon.idle_exit_secs = soon\n",
        ));
        assert!(c.startup.quick_start, "invalid bool keeps default");
        assert_eq!(c.daemon.idle_exit_secs, 10, "invalid u64 keeps default");
        assert!(c.warnings.iter().any(|w| w.contains("startup.quick_start")));
        assert!(c.warnings.iter().any(|w| w.contains("daemon.idle_exit_secs")));
    }

    #[test]
    fn context_management_defaults_off_and_parses_all_keys() {
        use super::{ContextManagementConfig, ContextManagementMode};
        assert_eq!(
            super::load_config_from_str("").context_management,
            ContextManagementConfig::default()
        );
        let parsed = super::load_config_from_str(
            "context_management.mode = AUTO\n\
             context_management.pressure_tokens = 250000\n\
             context_management.rollover_tokens = 400000\n\
             context_management.reserve_tokens = 24000\n\
             context_management.finish_rounds = 3\n\
             context_window = 1m\n",
        );
        assert_eq!(
            parsed.context_management,
            ContextManagementConfig {
                mode: ContextManagementMode::Auto,
                pressure_tokens: Some(250_000),
                rollover_tokens: Some(400_000),
                reserve_tokens: 24_000,
                finish_rounds: 3,
            }
        );
        assert!(parsed.warnings.is_empty(), "{:?}", parsed.warnings);
        assert!(parsed.provider_keys.is_empty());
        assert!(super::load_config_from_str("context_management.mode = off")
            .warnings
            .is_empty());
    }

    #[test]
    fn context_management_auto_clears_overrides_and_allows_bounded_extremes() {
        for rounds in [0, super::ContextManagementConfig::MAX_FINISH_ROUNDS] {
            let parsed = super::load_config_from_str(&format!(
                "context_management.mode = auto\n\
                 context_management.pressure_tokens = 300000\n\
                 context_management.rollover_tokens = 450000\n\
                 context_management.pressure_tokens = auto\n\
                 context_management.rollover_tokens = AUTO\n\
                 context_management.finish_rounds = {rounds}\n"
            ));
            assert_eq!(parsed.context_management.pressure_tokens, None);
            assert_eq!(parsed.context_management.rollover_tokens, None);
            assert_eq!(parsed.context_management.finish_rounds, rounds);
            assert!(parsed.warnings.is_empty());
        }
    }

    #[test]
    fn context_management_invalid_values_reset_entire_policy() {
        for (key, value) in [
            ("mode", "on"),
            ("pressure_tokens", "0"),
            ("pressure_tokens", "-1"),
            ("pressure_tokens", "250k"),
            ("pressure_tokens", "18446744073709551616"),
            ("rollover_tokens", "1"),
            ("rollover_tokens", "nope"),
            ("reserve_tokens", "0"),
            ("reserve_tokens", "1000001"),
            ("reserve_tokens", "auto"),
            ("finish_rounds", "9"),
            ("finish_rounds", "-1"),
            ("finish_rounds", "4294967296"),
            ("finish_rounds", ""),
            ("mod", "auto"),
        ] {
            let parsed = super::load_config_from_str(&format!(
                "context_management.mode = auto\ncontext_management.{key} = {value}\n"
            ));
            assert_eq!(
                parsed.context_management,
                super::ContextManagementConfig::default(),
                "{key}={value}"
            );
            assert!(!parsed.warnings.is_empty(), "{key}={value}");
            assert!(parsed.provider_keys.is_empty());
        }
        let duplicate = super::load_config_from_str(
            "context_management.mode = auto\ncontext_management.finish_rounds = bad\ncontext_management.finish_rounds = 2"
        );
        assert_eq!(
            duplicate.context_management,
            super::ContextManagementConfig::default()
        );
    }

    #[test]
    fn context_management_validates_final_threshold_order_and_window() {
        for fields in [
            "pressure_tokens = 400000\ncontext_management.rollover_tokens = 400000",
            "pressure_tokens = 500000\ncontext_management.rollover_tokens = 400000",
            "pressure_tokens = 1000000",
            "rollover_tokens = 1000001",
        ] {
            for window_first in [false, true] {
                let policy =
                    format!("context_management.mode = auto\ncontext_management.{fields}\n");
                let content = if window_first {
                    format!("context_window = 1m\n{policy}")
                } else {
                    format!("{policy}context_window = 1m\n")
                };
                let parsed = super::load_config_from_str(&content);
                assert_eq!(
                    parsed.context_management,
                    super::ContextManagementConfig::default()
                );
                assert!(!parsed.warnings.is_empty());
            }
        }
        // Temporarily reversed overrides are valid once the whole file is parsed.
        let parsed = super::load_config_from_str(
            "context_management.mode = auto\n\
             context_management.rollover_tokens = 100000\n\
             context_management.pressure_tokens = 300000\n\
             context_management.rollover_tokens = 450000\ncontext_window = 1m",
        );
        assert!(parsed.warnings.is_empty());
        assert_eq!(parsed.context_management.rollover_tokens, Some(450_000));
    }

    #[test]
    fn context_management_parsed_finish_override_bounds_rollover_extension() {
        use crate::core::context_policy::{
            assess_context, ContextAction, ContextBudget, ContextState, WorkPhase,
        };
        let config = super::load_config_from_str(
            "context_management.mode = auto\n\
             context_management.finish_rounds = 1\ncontext_window = 1m",
        );
        let budget = ContextBudget {
            context_window_tokens: 1_000_000,
            used_tokens: 400_000,
            hard_remaining_tokens: 600_000,
            required_next_round_tokens: 8_000,
        };
        let mut state = ContextState::default();
        state.report_phase(WorkPhase::Plan);
        let first = assess_context(&config.context_management, &state, budget);
        assert_eq!(
            first.action,
            ContextAction::FinishBounded {
                rounds_remaining: 0
            }
        );
        state = first.next_state;
        state.report_phase(WorkPhase::WrapUp);
        assert_eq!(
            assess_context(&config.context_management, &state, budget).action,
            ContextAction::Rollover
        );
    }

    #[test]
    fn context_management_keys_are_known_for_suggestions() {
        for key in [
            "mode",
            "pressure_tokens",
            "rollover_tokens",
            "reserve_tokens",
            "finish_rounds",
        ] {
            let full = format!("context_management.{key}");
            assert!(super::KNOWN_CONFIG_KEYS.contains(&full.as_str()));
            assert_eq!(
                super::did_you_mean(&format!("{full}x")),
                Some(full.as_str())
            );
        }
    }

    #[test]
    fn context_management_parsed_policy_rolls_over_before_executing_350k_plan() {
        use crate::core::context_policy::{
            assess_context, ContextAction, ContextBudget, ContextState, WorkPhase,
        };
        let config =
            super::load_config_from_str("context_management.mode = auto\ncontext_window = 1m");
        let budget = ContextBudget {
            context_window_tokens: config.context_window.unwrap(),
            used_tokens: 350_000,
            hard_remaining_tokens: 650_000,
            required_next_round_tokens: 8_000,
        };
        let mut state = ContextState::default();
        state.report_phase(WorkPhase::Plan);
        let plan = assess_context(&config.context_management, &state, budget);
        assert_eq!(plan.action, ContextAction::Advisory);
        state = plan.next_state;
        state.report_phase(WorkPhase::Execute);
        assert_eq!(
            assess_context(&config.context_management, &state, budget).action,
            ContextAction::Rollover
        );
    }

    #[test]
    fn tui_streaming_glow_defaults_off_and_parses() {
        assert!(!super::load_config_from_str("").tui_streaming_glow);
        assert!(super::load_config_from_str("tui_streaming_glow = on\n").tui_streaming_glow);
        assert!(!super::load_config_from_str("tui_streaming_glow = off\n").tui_streaming_glow);
        let invalid = super::load_config_from_str("tui_streaming_glow = sparkly\n");
        assert!(
            !invalid.tui_streaming_glow,
            "invalid keeps the default (off)"
        );
        assert!(invalid
            .warnings
            .iter()
            .any(|w| w.contains("tui_streaming_glow")));
    }

    #[test]
    fn tui_background_opaque_defaults_and_parses_supported_values() {
        assert!(super::load_config_from_str("").tui_background_opaque);
        assert!(
            super::load_config_from_str("tui_background_opaque = opaque\n").tui_background_opaque
        );
        assert!(
            !super::load_config_from_str("tui_background_opaque = invisible\n")
                .tui_background_opaque
        );
        let invalid = super::load_config_from_str("tui_background_opaque = translucent\n");
        assert!(invalid.tui_background_opaque);
        assert!(invalid
            .warnings
            .iter()
            .any(|w| w.contains("tui_background_opaque")));
    }

    #[test]
    fn turn_budget_keys_parse_typed_per_role() {
        let config = super::load_config_from_str(
            "turn_budget.worker.max_provider_rounds = 3\n\
             turn_budget.worker.max_cost_usd = 0.25\n\
             turn_budget.autonomous.max_elapsed_secs = 90\n\
             turn_budget.foreground.max_tool_calls = 7\n\
             turn_budget.foreground.max_round_renewals = 12\n\
             turn_budget.worker.max_provider_rounds_bogus = 1\n\
             turn_budget.nosuchrole.max_tool_calls = 1\n",
        );
        assert_eq!(config.turn_budgets.worker.max_provider_rounds, Some(3));
        assert_eq!(config.turn_budgets.worker.max_cost_usd, Some(0.25));
        assert_eq!(config.turn_budgets.autonomous.max_elapsed_secs, Some(90));
        assert_eq!(config.turn_budgets.foreground.max_tool_calls, Some(7));
        assert_eq!(config.turn_budgets.foreground.max_round_renewals, Some(12));
        // Unknown fields/roles warn and change nothing.
        assert_eq!(config.turn_budgets.worker.max_tool_calls, None);
        // Invalid values keep the default (None).
        let bad = super::load_config_from_str("turn_budget.worker.max_provider_rounds = nope\n");
        assert_eq!(bad.turn_budgets.worker.max_provider_rounds, None);
    }

    #[test]
    fn memory_keys_all_parse_with_consent() {
        let config = super::load_config_from_str(
            "memory.default_mode = capture_and_recall\n\
             memory.default_mode_confirmed = true\n\
             memory.recall_max_records = 12\n\
             memory.recall_max_tokens = 2048\n\
             memory.recall_timeout_ms = 250\n\
             memory.capture_tools = off\n\
             memory.capture_assistant = false\n\
             memory.capture_user = false\n\
             memory.auto_consolidate = on\n\
             memory.local_embeddings = on\n\
             memory.gliner = on\n",
        );
        assert_eq!(config.memory.default_mode, "capture_and_recall");
        assert!(config.memory.default_mode_confirmed);
        assert_eq!(config.memory.recall_max_records, 12);
        assert_eq!(config.memory.recall_max_tokens, 2048);
        assert_eq!(config.memory.recall_timeout_ms, 250);
        assert_eq!(config.memory.capture_tools, "off");
        assert!(!config.memory.capture_assistant);
        assert!(!config.memory.capture_user);
        assert_eq!(config.memory.auto_consolidate, "on");
        assert_eq!(config.memory.local_embeddings, "on");
        assert_eq!(config.memory.gliner, "on");
    }

    #[test]
    fn memory_defaults_match_spec_12() {
        let config = super::load_config_from_str("");
        assert_eq!(config.memory, super::MemoryConfig::default());
        assert_eq!(config.memory.default_mode, "off");
        assert!(!config.memory.default_mode_confirmed);
        assert_eq!(config.memory.recall_max_records, 8);
        assert_eq!(config.memory.recall_max_tokens, 4096);
        assert_eq!(config.memory.recall_timeout_ms, 150);
        assert_eq!(config.memory.capture_tools, "summary_only");
        assert!(config.memory.capture_assistant);
        assert!(config.memory.capture_user);
        assert_eq!(config.memory.auto_consolidate, "off");
        assert_eq!(config.memory.local_embeddings, "off");
        assert_eq!(config.memory.gliner, "off");
    }

    #[test]
    fn memory_unknown_values_fail_closed_to_defaults() {
        let config = super::load_config_from_str(
            "memory.default_mode = recall_everything_forever\n\
             memory.default_mode_confirmed = true\n\
             memory.recall_max_records = lots\n\
             memory.recall_max_tokens = -5\n\
             memory.recall_timeout_ms = fast\n\
             memory.capture_tools = full\n\
             memory.capture_assistant = maybe\n\
             memory.capture_user = sometimes\n\
             memory.auto_consolidate = aggressive\n\
             memory.local_embeddings = auto\n\
             memory.gliner = download\n\
             memory.nosuchfield = 1\n",
        );
        // Unrecognised mode string must stay "off" — never a non-off mode.
        assert_eq!(config.memory.default_mode, "off");
        assert_eq!(config.memory.recall_max_records, 8);
        assert_eq!(config.memory.recall_max_tokens, 4096);
        assert_eq!(config.memory.recall_timeout_ms, 150);
        assert_eq!(config.memory.capture_tools, "summary_only");
        assert!(config.memory.capture_assistant);
        assert!(config.memory.capture_user);
        assert_eq!(config.memory.auto_consolidate, "off");
        assert_eq!(config.memory.local_embeddings, "off");
        assert_eq!(config.memory.gliner, "off");
    }

    #[test]
    fn memory_default_mode_without_consent_reverts_to_off() {
        let config = super::load_config_from_str("memory.default_mode = recall_each_prompt\n");
        assert_eq!(config.memory.default_mode, "off");
        assert!(
            config
                .warnings
                .iter()
                .any(|w| w.contains("memory.default_mode_confirmed")),
            "reversion must surface a warning; got: {:?}",
            config.warnings
        );

        // Explicit false consent is not consent.
        let denied = super::load_config_from_str(
            "memory.default_mode = capture_only\n\
             memory.default_mode_confirmed = false\n",
        );
        assert_eq!(denied.memory.default_mode, "off");

        // Garbage consent value fails closed — not consent.
        let garbage = super::load_config_from_str(
            "memory.default_mode = capture_only\n\
             memory.default_mode_confirmed = definitely\n",
        );
        assert_eq!(garbage.memory.default_mode, "off");
    }

    #[test]
    fn memory_consent_is_order_independent() {
        // Consent key before the mode key.
        let before = super::load_config_from_str(
            "memory.default_mode_confirmed = true\n\
             memory.default_mode = recall_once\n",
        );
        assert_eq!(before.memory.default_mode, "recall_once");
        // Consent key after the mode key.
        let after = super::load_config_from_str(
            "memory.default_mode = recall_once\n\
             memory.default_mode_confirmed = true\n",
        );
        assert_eq!(after.memory.default_mode, "recall_once");
    }

    #[test]
    fn memory_backend_defaults_are_independent_of_consent() {
        let config = super::load_config_from_str("");
        assert_eq!(config.memory_backend, super::MemoryBackendConfig::default());
        assert_eq!(config.memory_backend.kind, super::MemoryBackendKind::Legacy);
        let axel = super::load_config_from_str("memory.backend = axel\n");
        assert_eq!(axel.memory_backend.kind, super::MemoryBackendKind::Axel);
        assert_eq!(axel.memory, config.memory);
        assert!(axel.warnings.is_empty());
    }

    #[test]
    fn user_wide_notes_require_explicit_valid_opt_in() {
        let default = super::load_config_from_str("memory.backend = axel\n");
        assert!(!default.memory_backend.user_scope);
        let enabled =
            super::load_config_from_str("memory.backend = axel\nmemory.user_scope = true\n");
        assert!(enabled.memory_backend.user_scope);
        assert_eq!(enabled.memory, default.memory);
        for bad in ["yes", "", "1", "TRUE"] {
            let config = super::load_config_from_str(&format!(
                "memory.user_scope = {bad}\nmemory.backend = axel\n"
            ));
            assert_eq!(
                config.memory_backend.kind,
                super::MemoryBackendKind::Unavailable
            );
        }
    }

    #[test]
    fn memory_backend_invalid_selector_fails_closed() {
        for content in [
            "memory.backend = typo\n",
            "memory.backend = \n",
            "memory.backend = unavailable\n",
            "memory.backend = axel\nmemory.backend = typo\n",
            "memory.backend = typo\nmemory.backend = legacy\n",
        ] {
            let config = super::load_config_from_str(content);
            assert_eq!(
                config.memory_backend.kind,
                super::MemoryBackendKind::Unavailable
            );
            assert!(config
                .warnings
                .iter()
                .any(|w| w.contains("memory backend unavailable")));
        }
    }

    #[test]
    fn memory_backend_absolute_paths_are_preserved() {
        let root = std::env::current_dir().unwrap();
        let executable = root.join("fixture bin/axel");
        let brain = root.join("fixture brain");
        let config = super::load_config_from_str(&format!(
            "memory.axel.brain = {}\nmemory.backend = axel\nmemory.axel.executable = {}\n",
            brain.display(),
            executable.display()
        ));
        assert_eq!(config.memory_backend.kind, super::MemoryBackendKind::Axel);
        assert_eq!(config.memory_backend.executable, Some(executable));
        assert_eq!(config.memory_backend.brain, Some(brain));
        assert!(config.warnings.is_empty());
    }

    #[test]
    fn memory_backend_relative_or_empty_paths_fail_closed_in_any_order() {
        for key in ["memory.axel.executable", "memory.axel.brain"] {
            for path in ["relative/path", "~/brain", ""] {
                for content in [
                    format!("memory.backend = axel\n{key} = {path}\n"),
                    format!("{key} = {path}\nmemory.backend = legacy\n"),
                ] {
                    let config = super::load_config_from_str(&content);
                    assert_eq!(
                        config.memory_backend.kind,
                        super::MemoryBackendKind::Unavailable
                    );
                    assert!(config.warnings.iter().any(|w| w.contains("absolute path")));
                }
            }
        }
    }

    #[test]
    fn memory_config_surface_is_closed_by_construction() {
        // Exhaustive struct literal — no `..Default::default()` spread. This
        // fails to COMPILE if any field is added to or removed from
        // MemoryConfig, pinning the exact memory.* config surface. Secret,
        // retention, and project-scope semantics have no field here, so no
        // `memory.secret*` / `memory.retention*` / `memory.project*` config
        // key can exist (spec §12: those rules are not configurable to fail
        // open). Asserted by construction, not by test disproof.
        let _closed_surface = super::MemoryConfig {
            default_mode: "off".to_string(),
            default_mode_confirmed: false,
            recall_max_records: 8,
            recall_max_tokens: 4096,
            recall_timeout_ms: 150,
            capture_tools: "summary_only".to_string(),
            capture_assistant: true,
            capture_user: true,
            auto_consolidate: "off".to_string(),
            local_embeddings: "off".to_string(),
            gliner: "off".to_string(),
        };
    }

    use super::*;
    use serial_test::serial;

    #[test]
    fn test_levenshtein_basics() {
        assert_eq!(levenshtein("model", "model"), 0);
        assert_eq!(levenshtein("modle", "model"), 2);
        assert_eq!(levenshtein("them", "theme"), 1);
    }

    #[test]
    fn test_did_you_mean_close_typos() {
        assert_eq!(did_you_mean("modle"), Some("model"));
        assert_eq!(did_you_mean("them"), Some("theme"));
        assert_eq!(did_you_mean("thinkng"), Some("thinking"));
        assert_eq!(did_you_mean("completely_unrelated_key"), None);
    }

    #[test]
    #[serial]
    fn test_config_warnings_unknown_key_and_bad_values() {
        let home = std::env::temp_dir().join(format!("synaps-warn-test-{}", std::process::id()));
        let dir = home.join(".synaps-cli");
        std::fs::create_dir_all(&dir).unwrap();
        std::fs::write(dir.join("config"), "modle = claude-opus-4-6\nthinking = hgih\nbash_timeout = 0\nknowledge.jawz_notes = ~/Jawz/notes\ncustom.plugin.key = 42\n").unwrap();

        with_home(&home, || {
            let config = load_config();
            // Dotted (namespaced) keys must NOT warn — plugins own those.
            assert_eq!(config.warnings.len(), 3, "warnings: {:?}", config.warnings);
            assert!(
                !config.warnings.iter().any(|w| w.contains("knowledge")),
                "{:?}",
                config.warnings
            );
            assert!(
                config
                    .warnings
                    .iter()
                    .any(|w| w.contains("did you mean 'model'")),
                "{:?}",
                config.warnings
            );
            assert!(
                config.warnings.iter().any(|w| w.contains("thinking")),
                "{:?}",
                config.warnings
            );
            assert!(
                config.warnings.iter().any(|w| w.contains("below minimum")),
                "{:?}",
                config.warnings
            );
            // Bad values fall back to defaults
            assert_eq!(config.bash_timeout, 30);
            assert_eq!(config.thinking_budget, None);
        });
        let _ = std::fs::remove_dir_all(&home);
    }

    // ── cache_keepwarm (task #444) ──

    #[test]
    fn test_cache_keepwarm_is_off_by_default() {
        assert_eq!(SynapsConfig::default().cache_keepwarm, CacheKeepWarm::Off);
        assert_eq!(load_config_from_str("").cache_keepwarm, CacheKeepWarm::Off);
    }

    #[test]
    fn test_cache_keepwarm_parse_table() {
        for (raw, want) in [
            ("off", Some(CacheKeepWarm::Off)),
            ("OFF", Some(CacheKeepWarm::Off)),
            ("0h", Some(CacheKeepWarm::Off)),
            ("auto", Some(CacheKeepWarm::Auto)),
            (" Auto ", Some(CacheKeepWarm::Auto)),
            ("1h", Some(CacheKeepWarm::Hours(1))),
            ("12H", Some(CacheKeepWarm::Hours(12))),
            ("48h", Some(CacheKeepWarm::Hours(MAX_CACHE_KEEPWARM_HOURS))),
            ("49h", None),
            ("12", None),
            ("h", None),
            ("-1h", None),
            ("lots", None),
        ] {
            assert_eq!(CacheKeepWarm::parse(raw), want, "{raw:?}");
        }
        for mode in [CacheKeepWarm::Off, CacheKeepWarm::Auto, CacheKeepWarm::Hours(6)] {
            assert_eq!(CacheKeepWarm::parse(&mode.to_string()), Some(mode));
        }
    }

    #[test]
    fn test_cache_keepwarm_config_key() {
        let c = load_config_from_str("cache_keepwarm = auto\ncache_ttl = 5m\n");
        assert_eq!(c.cache_keepwarm, CacheKeepWarm::Auto);
        assert_eq!(c.cache_ttl, CacheTtl::FiveMinutes);
        assert!(c.warnings.is_empty(), "warnings: {:?}", c.warnings);

        let c = load_config_from_str("cache_keepwarm = 6h\n");
        assert_eq!(c.cache_keepwarm, CacheKeepWarm::Hours(6));

        assert_eq!(c.cache_keepwarm_auto_max_hours, 24, "default auto cap");

        let c = load_config_from_str("cache_keepwarm_auto_max_hours = 8\n");
        assert_eq!(c.cache_keepwarm_auto_max_hours, 8);
        assert!(c.warnings.is_empty(), "warnings: {:?}", c.warnings);
        let c = load_config_from_str("cache_keepwarm_auto_max_hours = 12h\n");
        assert_eq!(c.cache_keepwarm_auto_max_hours, 12);
        for bad in ["0", "49", "lots"] {
            let c = load_config_from_str(&format!("cache_keepwarm_auto_max_hours = {bad}\n"));
            assert_eq!(c.cache_keepwarm_auto_max_hours, 24, "{bad}");
            assert!(
                c.warnings.iter().any(|w| w.contains("auto_max_hours")),
                "{bad}"
            );
        }

        let c = load_config_from_str("cache_keepwarm = forever\n");
        assert_eq!(c.cache_keepwarm, CacheKeepWarm::Off, "garbage keeps keep-warm off");
        assert!(c.warnings.iter().any(|w| w.contains("cache_keepwarm")));
    }

    // ── cache_ttl parse table (spec §3.1) ──

    #[test]
    fn test_cache_ttl_parse_table() {
        // 5m aliases
        assert_eq!(CacheTtl::parse("5m"), Some(CacheTtl::FiveMinutes));
        assert_eq!(CacheTtl::parse("5min"), Some(CacheTtl::FiveMinutes));
        assert_eq!(CacheTtl::parse("default"), Some(CacheTtl::FiveMinutes));
        // 1h aliases
        assert_eq!(CacheTtl::parse("1h"), Some(CacheTtl::OneHour));
        assert_eq!(CacheTtl::parse("60m"), Some(CacheTtl::OneHour));
        assert_eq!(CacheTtl::parse("1hr"), Some(CacheTtl::OneHour));
        // hybrid
        assert_eq!(CacheTtl::parse("hybrid"), Some(CacheTtl::Hybrid));
        // case-insensitive
        assert_eq!(CacheTtl::parse("1H"), Some(CacheTtl::OneHour));
        assert_eq!(CacheTtl::parse("HYBRID"), Some(CacheTtl::Hybrid));
        assert_eq!(CacheTtl::parse("Default"), Some(CacheTtl::FiveMinutes));
        // garbage → None (caller warns + defaults)
        assert_eq!(CacheTtl::parse("2h"), None);
        assert_eq!(CacheTtl::parse(""), None);
        assert_eq!(CacheTtl::parse("forever"), None);
    }

    #[test]
    fn test_cache_ttl_default_is_five_minutes() {
        assert_eq!(CacheTtl::default(), CacheTtl::FiveMinutes);
        assert_eq!(SynapsConfig::default().cache_ttl, CacheTtl::FiveMinutes);
    }

    #[test]
    fn test_max_fps_default_is_60() {
        assert_eq!(SynapsConfig::default().max_fps, 60);
    }

    // ── theme_transition parse table (animated theme transitions) ──

    #[test]
    fn test_theme_transition_parse_table() {
        use ThemeTransitionMode as M;
        assert_eq!(M::parse("on"), Some(M::On));
        assert_eq!(M::parse("ON"), Some(M::On));
        assert_eq!(M::parse("off"), Some(M::Off));
        assert_eq!(M::parse("Off"), Some(M::Off));
        // integer ms, clamped to 0..=2000
        assert_eq!(M::parse("500"), Some(M::Ms(500)));
        assert_eq!(M::parse("0"), Some(M::Ms(0)));
        assert_eq!(M::parse("2000"), Some(M::Ms(2000)));
        assert_eq!(M::parse("99999"), Some(M::Ms(2000)), "clamped to MAX_MS");
        // garbage → None (caller warns + keeps default)
        assert_eq!(M::parse("fast"), None);
        assert_eq!(M::parse(""), None);
        assert_eq!(M::parse("-5"), None);
        assert_eq!(M::parse("1.5"), None);
    }

    #[test]
    fn test_theme_transition_duration_ms() {
        use ThemeTransitionMode as M;
        assert_eq!(M::On.duration_ms(), M::DEFAULT_MS);
        assert_eq!(M::DEFAULT_MS, 350);
        assert_eq!(M::Off.duration_ms(), 0);
        assert_eq!(M::Ms(120).duration_ms(), 120);
        assert_eq!(M::Ms(0).duration_ms(), 0, "0 ms behaves like off");
        assert_eq!(M::Ms(u64::MAX).duration_ms(), M::MAX_MS);
    }

    #[test]
    fn test_theme_transition_config_key_parses_and_defaults() {
        use ThemeTransitionMode as M;
        assert_eq!(SynapsConfig::default().theme_transition, M::On);
        assert_eq!(
            super::load_config_from_str("theme_transition = off\n").theme_transition,
            M::Off
        );
        assert_eq!(
            super::load_config_from_str("theme_transition = 750\n").theme_transition,
            M::Ms(750)
        );
        let bad = super::load_config_from_str("theme_transition = warp\n");
        assert_eq!(bad.theme_transition, M::On, "bad value keeps default");
        assert!(
            bad.warnings.iter().any(|w| w.contains("theme_transition")),
            "{:?}",
            bad.warnings
        );
    }

    #[test]
    #[serial]
    fn test_max_fps_config_parse_and_validation() {
        let home = std::env::temp_dir().join(format!("synaps-maxfps-test-{}", std::process::id()));
        let dir = home.join(".synaps-cli");
        std::fs::create_dir_all(&dir).unwrap();

        // Valid high-refresh value parses, no warning.
        std::fs::write(dir.join("config"), "max_fps = 144\n").unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(config.max_fps, 144);
            assert!(
                config.warnings.is_empty(),
                "warnings: {:?}",
                config.warnings
            );
        });

        // Out-of-range (0) → default 60 + boot warning (never blocks boot).
        std::fs::write(dir.join("config"), "max_fps = 0\n").unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(config.max_fps, 60);
            assert!(
                config.warnings.iter().any(|w| w.contains("max_fps")),
                "warnings: {:?}",
                config.warnings
            );
        });

        // Non-numeric → default 60 + warning.
        std::fs::write(dir.join("config"), "max_fps = fast\n").unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(config.max_fps, 60);
            assert!(
                config.warnings.iter().any(|w| w.contains("max_fps")),
                "warnings: {:?}",
                config.warnings
            );
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn test_cache_ttl_config_parse_and_garbage_warning() {
        let home =
            std::env::temp_dir().join(format!("synaps-cachettl-test-{}", std::process::id()));
        let dir = home.join(".synaps-cli");
        std::fs::create_dir_all(&dir).unwrap();

        // Valid value parses, no warning.
        std::fs::write(dir.join("config"), "cache_ttl = hybrid\n").unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(config.cache_ttl, CacheTtl::Hybrid);
            assert!(
                config.warnings.is_empty(),
                "warnings: {:?}",
                config.warnings
            );
        });

        // Garbage value → 5m default + boot warning (never blocks boot).
        std::fs::write(dir.join("config"), "cache_ttl = 2h\n").unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(config.cache_ttl, CacheTtl::FiveMinutes);
            assert!(
                config.warnings.iter().any(|w| w.contains("cache_ttl")),
                "warnings: {:?}",
                config.warnings
            );
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    fn test_parse_thinking_budget() {
        use crate::core::reasoning::ThinkingSpec;
        // ThinkingSpec::parse replaced parse_thinking_budget; verify budget values.
        assert_eq!(ThinkingSpec::parse("low").unwrap().to_budget(), Some(2048));
        assert_eq!(
            ThinkingSpec::parse("medium").unwrap().to_budget(),
            Some(4096)
        );
        assert_eq!(
            ThinkingSpec::parse("high").unwrap().to_budget(),
            Some(16384)
        );
        assert_eq!(
            ThinkingSpec::parse("xhigh").unwrap().to_budget(),
            Some(32768)
        );
        assert_eq!(ThinkingSpec::parse("8192").unwrap().to_budget(), Some(8192));
        let config = load_config_from_str("thinking = 8192\n");
        assert_eq!(config.thinking_level, None);
        assert_eq!(config.thinking_budget, Some(8192));
        assert_eq!(ThinkingSpec::parse("invalid"), None);
    }

    #[test]
    fn test_base_dir() {
        let path = base_dir();
        assert!(path.to_string_lossy().ends_with(".synaps-cli"));
    }

    #[test]
    fn test_resolve_system_prompt_explicit() {
        let result = resolve_system_prompt(Some("test prompt"));
        assert_eq!(result, "test prompt");
    }

    #[test]
    fn test_resolve_system_prompt_none() {
        let result = resolve_system_prompt(None);
        assert!(result.contains("helpful AI agent"));
    }

    // Note: test_load_config_nonexistent_file removed — HOME env var mutation
    // is not thread-safe and races with shell config tests. Coverage provided
    // by shell::config::tests::test_shell_config_from_file.

    #[test]
    fn test_synaps_config_default() {
        let config = SynapsConfig::default();
        assert_eq!(config.model, None);
        assert_eq!(config.thinking_budget, None);
        assert_eq!(config.max_tool_output, 30000);
        assert_eq!(config.bash_timeout, 30);
        assert_eq!(config.bash_max_timeout, 300);
        assert_eq!(config.subagent_timeout, 300);
        assert_eq!(config.api_retries, 3);
        assert_eq!(config.theme, None);
        assert!(config.disabled_plugins.is_empty());
        assert!(config.favorite_models.is_empty());
        assert!(config.disabled_skills.is_empty());
        assert!(!config.progressive_tool_disclosure);
        assert_eq!(config.tools_activation_confirm, ActivationConfirm::Auto);
        assert_eq!(config.shell.max_sessions, 5);
        assert_eq!(config.shell.idle_timeout.as_secs(), 600);
        // Server config defaults
        assert!(config.server.allowed_origins.is_empty());
        assert_eq!(config.server.token, None);
        assert!(!config.server.auto_approve_confirms);
        assert_eq!(config.server.max_message_size, None);
        // Bridge config defaults
        assert!(config.bridge.uds_path.is_none());
        assert!(!config.bridge.heartbeat_mirror);
        assert_eq!(config.bridge.heartbeat_timeout_ms, 250);
    }

    #[test]
    #[serial]
    fn test_load_config_tools_activation_confirm_modes() {
        for (raw, expected, warns) in [
            ("prompt", ActivationConfirm::Prompt, false),
            ("deny", ActivationConfirm::Deny, false),
            ("AUTO", ActivationConfirm::Auto, false),
            ("garbage", ActivationConfirm::Auto, true),
        ] {
            let home = make_test_home(&format!("activation-confirm-{raw}"));
            let cfg = home.join(".synaps-cli/config");
            std::fs::write(&cfg, format!("tools.activation_confirm = {raw}\n")).unwrap();
            with_home(&home, || {
                let config = load_config();
                assert_eq!(config.tools_activation_confirm, expected, "{raw}");
                assert_eq!(
                    config.warnings.iter().any(|w| w.contains("tools.activation_confirm")),
                    warns,
                    "{raw}: {:?}",
                    config.warnings
                );
            });
            let _ = std::fs::remove_dir_all(&home);
        }
    }

    #[test]
    #[serial]
    fn test_load_config_progressive_tool_disclosure_is_opt_in() {
        let home = make_test_home("progressive-tool-disclosure");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "progressive_tool_disclosure = true\n").unwrap();

        with_home(&home, || {
            let config = load_config();
            assert!(config.progressive_tool_disclosure);
            assert!(config.warnings.is_empty());
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn test_load_config_bridge_keys() {
        let home = make_test_home("bridge-keys");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(
            &cfg,
            "\
bridge.uds_path = /tmp/some/control.sock\n\
bridge.heartbeat_mirror = true\n\
bridge.heartbeat_timeout_ms = 750\n\
",
        )
        .unwrap();

        with_home(&home, || {
            let config = load_config();
            assert_eq!(
                config.bridge.uds_path,
                Some(std::path::PathBuf::from("/tmp/some/control.sock")),
            );
            assert!(config.bridge.heartbeat_mirror);
            assert_eq!(config.bridge.heartbeat_timeout_ms, 750);
            assert_eq!(
                config.bridge.resolved_uds_path(),
                std::path::PathBuf::from("/tmp/some/control.sock"),
            );
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    fn test_bridge_config_defaults() {
        let cfg = BridgeConfig::default();
        assert!(cfg.uds_path.is_none());
        assert!(!cfg.heartbeat_mirror);
        assert_eq!(cfg.heartbeat_timeout_ms, 250);
        // resolved path falls under base_dir()/bridge/control.sock
        let resolved = cfg.resolved_uds_path();
        assert!(resolved.ends_with("bridge/control.sock"));
    }

    #[test]
    #[serial]
    fn test_bridge_heartbeat_mirror_defaults_off_when_unset() {
        let home = make_test_home("bridge-default-off");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "model = claude-sonnet-4-6\n").unwrap();

        with_home(&home, || {
            let config = load_config();
            assert!(!config.bridge.heartbeat_mirror);
            assert!(config.bridge.uds_path.is_none());
            assert_eq!(config.bridge.heartbeat_timeout_ms, 250);
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    fn compaction_disclosure_keys_parse_with_typed_warnings() {
        let config = load_config_from_str(
            "compaction_mode = local\ncompaction_exclude = thinking, tool_results, bogus\n",
        );
        assert_eq!(
            config.compaction_mode,
            crate::core::compaction::CompactionMode::LocalOnly
        );
        assert_eq!(
            config.compaction_exclude,
            vec![
                crate::core::compaction::ContentClass::Thinking,
                crate::core::compaction::ContentClass::ToolResults,
            ]
        );
        assert!(
            config.warnings.iter().any(|w| w.contains("bogus")),
            "unknown class must warn: {:?}",
            config.warnings
        );

        let defaults = load_config_from_str("");
        assert_eq!(
            defaults.compaction_mode,
            crate::core::compaction::CompactionMode::Remote
        );
        assert!(defaults.compaction_exclude.is_empty());

        let bad_mode = load_config_from_str("compaction_mode = cloud\n");
        assert_eq!(
            bad_mode.compaction_mode,
            crate::core::compaction::CompactionMode::Remote
        );
        assert!(bad_mode
            .warnings
            .iter()
            .any(|w| w.contains("compaction_mode")));
    }

    #[test]
    #[serial]
    fn test_load_config_server_keys() {
        let home = make_test_home("server-keys");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(
            &cfg,
            "\
server.allowed_origins = http://localhost:3000, http://localhost:5193\n\
server.token = my-secret-token\n\
server.auto_approve_confirms = true\n\
server.max_message_size = 65536\n\
context_window = 200k\n\
",
        )
        .unwrap();

        with_home(&home, || {
            let config = load_config();
            assert_eq!(
                config.server.allowed_origins,
                vec![
                    "http://localhost:3000".to_string(),
                    "http://localhost:5193".to_string(),
                ]
            );
            assert_eq!(config.server.token, Some("my-secret-token".to_string()));
            assert!(config.server.auto_approve_confirms);
            // Explicit max_message_size takes precedence over context_window derivation
            assert_eq!(config.server.max_message_size, Some(65536));
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn test_server_max_message_size_derived_from_context_window() {
        let home = make_test_home("server-derive");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "context_window = 200k\n").unwrap();

        with_home(&home, || {
            let config = load_config();
            // 200_000 tokens * 4 bytes/token = 800_000 bytes
            assert_eq!(config.server.max_message_size, Some(800_000));
        });

        let _ = std::fs::remove_dir_all(&home);
    }

    fn make_test_home(subdir: &str) -> std::path::PathBuf {
        let dir = std::path::PathBuf::from(format!("/tmp/synaps-write-test-{}", subdir));
        let _ = std::fs::remove_dir_all(&dir);
        std::fs::create_dir_all(dir.join(".synaps-cli")).unwrap();
        dir
    }

    fn with_home<F: FnOnce()>(home: &std::path::Path, f: F) {
        // `base_dir()` reads SYNAPS_BASE_DIR before HOME: pin it too, or a value
        // another test left set redirects the write away from `home`.
        let original = std::env::var("HOME").ok();
        let original_base = std::env::var("SYNAPS_BASE_DIR").ok();
        std::env::set_var("HOME", home);
        std::env::set_var("SYNAPS_BASE_DIR", home.join(".synaps-cli"));
        f();
        if let Some(h) = original {
            std::env::set_var("HOME", h);
        } else {
            std::env::remove_var("HOME");
        }
        if let Some(b) = original_base {
            std::env::set_var("SYNAPS_BASE_DIR", b);
        } else {
            std::env::remove_var("SYNAPS_BASE_DIR");
        }
    }

    #[test]
    #[serial]
    fn write_config_value_replaces_existing_key() {
        let home = make_test_home("replace");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "model = claude-opus-4-6\nthinking = low\n").unwrap();

        with_home(&home, || {
            write_config_value("model", "claude-sonnet-4-6").unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("model = claude-sonnet-4-6"));
        assert!(contents.contains("thinking = low"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn write_config_value_appends_when_missing() {
        let home = make_test_home("append");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "model = claude-opus-4-6\n").unwrap();

        with_home(&home, || {
            write_config_value("theme", "dracula").unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("model = claude-opus-4-6"));
        assert!(contents.contains("theme = dracula"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn write_config_value_concurrent_writers_lose_nothing() {
        let home = make_test_home("concurrent");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "# keep\n").unwrap();

        // HOME is process-global; set it for the whole test, not per thread.
        with_home(&home, || {
            let a = std::thread::spawn(|| {
                for i in 0..200 {
                    write_config_value("a_key", &i.to_string()).unwrap();
                }
            });
            let b = std::thread::spawn(|| {
                for i in 0..200 {
                    write_config_value("b_key", &i.to_string()).unwrap();
                }
            });
            a.join().unwrap();
            b.join().unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("# keep"), "{contents}");
        assert!(contents.contains("a_key = 199"), "{contents}");
        assert!(contents.contains("b_key = 199"), "{contents}");
        assert_eq!(contents.matches("a_key").count(), 1);
        assert_eq!(contents.matches("b_key").count(), 1);

        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let lock = home.join(".synaps-cli/config.lock");
            let mode = std::fs::metadata(&lock).unwrap().permissions().mode() & 0o777;
            assert_eq!(mode, 0o600);
        }
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn config_lock_kill_switch_still_writes() {
        let home = make_test_home("lock-off");
        let cfg = home.join(".synaps-cli/config");
        std::env::set_var("SYNAPS_CONFIG_LOCK", "0");
        with_home(&home, || {
            write_config_value("model", "claude-sonnet-4-6").unwrap();
        });
        std::env::remove_var("SYNAPS_CONFIG_LOCK");
        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("model = claude-sonnet-4-6"));
        assert!(!home.join(".synaps-cli/config.lock").exists());
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn add_favorite_model_end_to_end_does_not_deadlock() {
        let home = make_test_home("favorite-lock");
        let cfg = home.join(".synaps-cli/config");
        with_home(&home, || {
            add_favorite_model("anthropic/claude-sonnet-4-6").unwrap();
            add_favorite_model("openai/gpt-5").unwrap();
            remove_favorite_model("anthropic/claude-sonnet-4-6").unwrap();
        });
        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("favorite_models = openai/gpt-5"), "{contents}");
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn write_config_value_preserves_comments() {
        let home = make_test_home("comments");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "# user comment\nmodel = claude-opus-4-6\n# another\n").unwrap();

        with_home(&home, || {
            write_config_value("model", "claude-sonnet-4-6").unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("# user comment"));
        assert!(contents.contains("# another"));
        assert!(contents.contains("model = claude-sonnet-4-6"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn write_config_value_preserves_unknown_keys() {
        let home = make_test_home("unknown");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "custom_thing = 42\nmodel = claude-opus-4-6\n").unwrap();

        with_home(&home, || {
            write_config_value("model", "claude-sonnet-4-6").unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("custom_thing = 42"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn write_config_value_creates_file_if_absent() {
        let home = make_test_home("create");
        let cfg = home.join(".synaps-cli/config");
        assert!(!cfg.exists());

        with_home(&home, || {
            write_config_value("model", "claude-sonnet-4-6").unwrap();
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("model = claude-sonnet-4-6"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn load_config_parses_theme_key() {
        let dir = std::path::PathBuf::from("/tmp/synaps-config-test-theme/.synaps-cli");
        let _ = std::fs::create_dir_all(&dir);
        std::fs::write(dir.join("config"), "theme = dracula\n").unwrap();

        let original_home = std::env::var("HOME").ok();
        std::env::set_var("HOME", "/tmp/synaps-config-test-theme");

        let config = load_config();

        if let Some(home) = original_home {
            std::env::set_var("HOME", home);
        } else {
            std::env::remove_var("HOME");
        }
        let _ = std::fs::remove_dir_all("/tmp/synaps-config-test-theme");

        assert_eq!(config.theme.as_deref(), Some("dracula"));
    }

    #[test]
    #[serial]
    fn test_load_config_disable_lists() {
        let test_dir =
            std::path::PathBuf::from("/tmp/synaps-config-test-disable-lists/.synaps-cli");
        let _ = std::fs::create_dir_all(&test_dir);
        let config_path = test_dir.join("config");

        let config_content = r#"
# Test config with disable lists
favorite_models = claude/claude-opus-4-7, groq/llama-3.3-70b-versatile

disabled_plugins = foo, bar
disabled_skills = baz, plug:qual
"#;
        std::fs::write(&config_path, config_content).unwrap();

        let original_home = std::env::var("HOME").ok();
        std::env::set_var("HOME", "/tmp/synaps-config-test-disable-lists");

        let config = load_config();

        if let Some(home) = original_home {
            std::env::set_var("HOME", home);
        } else {
            std::env::remove_var("HOME");
        }

        let _ = std::fs::remove_dir_all("/tmp/synaps-config-test-disable-lists");

        assert_eq!(
            config.disabled_plugins,
            vec!["foo".to_string(), "bar".to_string()]
        );
        assert_eq!(
            config.favorite_models,
            vec![
                "claude/claude-opus-4-7".to_string(),
                "groq/llama-3.3-70b-versatile".to_string(),
            ]
        );
        assert_eq!(
            config.disabled_skills,
            vec!["baz".to_string(), "plug:qual".to_string()]
        );
    }

    #[test]
    #[serial]
    fn favorite_model_helpers_round_trip_through_config_file() {
        let home = make_test_home("favorite-models");
        let cfg = home.join(".synaps-cli/config");
        std::fs::write(&cfg, "model = claude-opus-4-7\n").unwrap();

        with_home(&home, || {
            add_favorite_model("groq/llama-3.3-70b-versatile").unwrap();
            add_favorite_model("claude/claude-opus-4-7").unwrap();
            add_favorite_model("groq/llama-3.3-70b-versatile").unwrap();
            assert!(is_favorite_model("groq/llama-3.3-70b-versatile"));
            remove_favorite_model("groq/llama-3.3-70b-versatile").unwrap();
            assert!(!is_favorite_model("groq/llama-3.3-70b-versatile"));
            assert!(is_favorite_model("claude/claude-opus-4-7"));
        });

        let contents = std::fs::read_to_string(&cfg).unwrap();
        assert!(contents.contains("model = claude-opus-4-7"));
        assert!(contents.contains("favorite_models = claude/claude-opus-4-7"));
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn test_load_config_new_keys() {
        // Create a temporary config directory with the new keys
        let test_dir = std::path::PathBuf::from("/tmp/synaps-config-test-new-keys/.synaps-cli");
        let _ = std::fs::create_dir_all(&test_dir);
        let config_path = test_dir.join("config");

        let config_content = r#"
# Test config with new keys
model = claude-haiku
thinking = medium
max_tool_output = 50000
bash_timeout = 45
bash_max_timeout = 600
subagent_timeout = 120
api_retries = 5
"#;
        std::fs::write(&config_path, config_content).unwrap();

        // Temporarily override the config path for this test
        let original_home = std::env::var("HOME").ok();
        std::env::set_var("HOME", "/tmp/synaps-config-test-new-keys");

        let config = load_config();

        // Restore original HOME
        if let Some(home) = original_home {
            std::env::set_var("HOME", home);
        } else {
            std::env::remove_var("HOME");
        }

        // Cleanup
        let _ = std::fs::remove_dir_all("/tmp/synaps-config-test-new-keys");

        assert_eq!(config.model, Some("claude-haiku".to_string()));
        assert_eq!(config.thinking_budget, Some(4096)); // medium = 4096
        assert_eq!(config.max_tool_output, 50000);
        assert_eq!(config.bash_timeout, 45);
        assert_eq!(config.bash_max_timeout, 600);
        assert_eq!(config.subagent_timeout, 120);
        assert_eq!(config.api_retries, 5);
    }

    // ── auth.* config + credential source (#157) ──

    // ── events.auto_turn parser ──────────────────────────────────────────────

    #[test]
    fn events_auto_turn_explicit_true_values() {
        for val in &["true", "TRUE", "1", "yes", "YES", "on", "ON"] {
            let cfg = load_config_from_str(&format!("events.auto_turn = {val}"));
            assert!(
                cfg.events.auto_turn,
                "expected true for events.auto_turn = {val}"
            );
        }
    }

    #[test]
    fn events_auto_turn_explicit_false_values() {
        for val in &["false", "FALSE", "0", "no", "NO", "off", "OFF"] {
            let cfg = load_config_from_str(&format!("events.auto_turn = {val}"));
            assert!(
                !cfg.events.auto_turn,
                "expected false for events.auto_turn = {val}"
            );
        }
    }

    #[test]
    fn events_auto_turn_typo_fails_safe_false() {
        // Unrecognised value should fail safe to false (with a warning on stderr).
        let cfg = load_config_from_str("events.auto_turn = fales");
        assert!(
            !cfg.events.auto_turn,
            "typo 'fales' must fail safe to false"
        );
    }

    // ── events.auto_turn_cap parser ──────────────────────────────────────────

    #[test]
    fn events_auto_turn_cap_default_is_five() {
        let cfg = load_config_from_str("");
        assert_eq!(cfg.events.auto_turn_cap, 5);
        assert_eq!(DEFAULT_AUTO_TURN_CAP, 5);
    }

    #[test]
    fn events_auto_turn_cap_zero_is_unlimited() {
        let cfg = load_config_from_str("events.auto_turn_cap = 0");
        assert_eq!(cfg.events.auto_turn_cap, 0);
    }

    #[test]
    fn events_auto_turn_cap_unlimited_aliases() {
        for val in ["unlimited", "inf", "infinite", "Infinity", "UNLIMITED", " inf "] {
            let cfg = load_config_from_str(&format!("events.auto_turn_cap = {val}"));
            assert_eq!(
                cfg.events.auto_turn_cap, 0,
                "expected 0 for events.auto_turn_cap = {val:?}"
            );
        }
    }

    #[test]
    fn events_auto_turn_cap_explicit_number() {
        let cfg = load_config_from_str("events.auto_turn_cap = 12");
        assert_eq!(cfg.events.auto_turn_cap, 12);
    }

    #[test]
    fn events_auto_turn_cap_garbage_keeps_default() {
        for val in ["banana", "-3", "5.5", "", "true"] {
            let cfg = load_config_from_str(&format!("events.auto_turn_cap = {val}"));
            assert_eq!(
                cfg.events.auto_turn_cap, 5,
                "garbage {val:?} must keep default 5"
            );
        }
    }

    #[test]
    fn events_auto_turn_cap_independent_of_auto_turn() {
        let cfg = load_config_from_str("events.auto_turn = false\nevents.auto_turn_cap = 0");
        assert!(!cfg.events.auto_turn);
        assert_eq!(cfg.events.auto_turn_cap, 0);
    }

    #[test]
    fn events_auto_turn_default_is_true() {
        let cfg = load_config_from_str("model = claude-haiku");
        assert!(cfg.events.auto_turn, "default must be true when key absent");
    }

    #[test]
    #[serial]
    fn test_auth_config_parses_endpoint_and_token() {
        let home = std::env::temp_dir().join(format!("synaps-auth-test-{}", std::process::id()));
        let dir = home.join(".synaps-cli");
        std::fs::create_dir_all(&dir).unwrap();
        std::fs::write(
            dir.join("config"),
            "auth.remote_endpoint = https://jade.jade:8181\nauth.machine_token = machine-abc\n",
        )
        .unwrap();
        with_home(&home, || {
            let config = load_config();
            assert_eq!(
                config.auth.remote_endpoint.as_deref(),
                Some("https://jade.jade:8181")
            );
            assert_eq!(config.auth.machine_token.as_deref(), Some("machine-abc"));
            // auth.* are namespaced -> must NOT warn as unknown keys
            assert!(
                !config.warnings.iter().any(|w| w.contains("auth.")),
                "{:?}",
                config.warnings
            );
        });
        let _ = std::fs::remove_dir_all(&home);
    }

    #[test]
    #[serial]
    fn test_credential_source_local_by_default() {
        std::env::remove_var("SYNAPS_AUTH_ENDPOINT");
        std::env::remove_var("SYNAPS_MACHINE_TOKEN");
        assert!(!AuthConfig::default().credential_source().is_remote());
    }

    #[test]
    #[serial]
    fn test_credential_source_remote_from_config() {
        std::env::remove_var("SYNAPS_AUTH_ENDPOINT");
        std::env::remove_var("SYNAPS_MACHINE_TOKEN");
        let auth = AuthConfig {
            remote_endpoint: Some("https://b".into()),
            machine_token: Some("m".into()),
        };
        assert_eq!(
            auth.credential_source(),
            crate::core::auth::CredentialSource::Remote {
                endpoint: "https://b".into(),
                machine_token: "m".into()
            }
        );
    }

    #[test]
    #[serial]
    fn test_credential_source_env_overrides_config() {
        let auth = AuthConfig {
            remote_endpoint: Some("https://config-host".into()),
            machine_token: Some("config-tok".into()),
        };
        std::env::set_var("SYNAPS_AUTH_ENDPOINT", "https://env-host");
        std::env::set_var("SYNAPS_MACHINE_TOKEN", "env-tok");
        let src = auth.credential_source();
        std::env::remove_var("SYNAPS_AUTH_ENDPOINT");
        std::env::remove_var("SYNAPS_MACHINE_TOKEN");
        assert_eq!(
            src,
            crate::core::auth::CredentialSource::Remote {
                endpoint: "https://env-host".into(),
                machine_token: "env-tok".into()
            }
        );
    }
    #[test]
    fn config_parses_ultracode_as_distinct_canonical_level() {
        let cfg = load_config_from_str("thinking = ultracode\n");
        assert_eq!(
            cfg.thinking_level,
            Some(crate::reasoning::ReasoningLevel::UltraCode)
        );
        assert_eq!(cfg.thinking_budget, None);
        for other in [
            crate::reasoning::ReasoningLevel::Ultra,
            crate::reasoning::ReasoningLevel::Max,
            crate::reasoning::ReasoningLevel::XHigh,
        ] {
            assert_ne!(cfg.thinking_level, Some(other));
        }
    }

    // ── /settings coverage support ────────────────────────────────────────

    /// `context_window = auto` is what the /settings cycler and `/context
    /// auto` write: it means "model default" (no override) and must not warn.
    #[test]
    fn context_window_auto_is_model_default_without_warning() {
        for spelling in ["auto", "AUTO", "Auto"] {
            let cfg = load_config_from_str(&format!("context_window = {spelling}\n"));
            assert_eq!(cfg.context_window, None, "{spelling}");
            assert!(cfg.warnings.is_empty(), "{spelling}: {:?}", cfg.warnings);
        }
        // `auto` after an explicit window clears it.
        let cfg = load_config_from_str("context_window = 1m\ncontext_window = auto\n");
        assert_eq!(cfg.context_window, None);
        assert!(cfg.warnings.is_empty(), "{:?}", cfg.warnings);
        // Existing spellings are unchanged; garbage still warns.
        assert_eq!(
            load_config_from_str("context_window = 200k\n").context_window,
            Some(200_000)
        );
        let bad = load_config_from_str("context_window = huge\n");
        assert_eq!(bad.context_window, None);
        assert!(bad.warnings.iter().any(|w| w.contains("context_window")));
    }

    /// The /settings sidecar row writes `sidecar_toggle_key`; it is read by
    /// the keybind registry and must not trip the unknown-key warning.
    #[test]
    fn sidecar_toggle_key_is_a_known_key() {
        let cfg = load_config_from_str("sidecar_toggle_key = F2\n");
        assert!(cfg.warnings.is_empty(), "{:?}", cfg.warnings);
        assert!(KNOWN_CONFIG_KEYS.contains(&"sidecar_toggle_key"));
        assert!(KNOWN_CONFIG_KEYS.contains(&"compaction_mode"));
        assert!(KNOWN_CONFIG_KEYS.contains(&"compaction_exclude"));
    }

    /// `config_content_problems` sees the stderr-only family diagnostics
    /// (shell/events/turn_budget/memory) as well as `warnings`, and nothing
    /// for valid values.
    #[test]
    fn config_content_problems_covers_family_diagnostics() {
        for bad in [
            "shell.max_sessions = lots",
            "shell.readiness_strategy = eventually",
            "events.auto_turn = maybe",
            "events.auto_turn_cap = many",
            "turn_budget.worker.max_cost_usd = cheap",
            "turn_budget.nobody.max_tool_calls = 3",
            "memory.capture_tools = everything",
            "memory.recall_max_records = -1",
            "memory.user_scope = yes",
            "cache_ttl = forever",
        ] {
            let problems = config_content_problems(bad);
            assert!(!problems.is_empty(), "{bad} should be reported");
        }
        for good in [
            "shell.max_sessions = 8",
            "shell.readiness_strategy = prompt",
            "events.auto_turn = off",
            "events.auto_turn_cap = unlimited",
            "turn_budget.worker.max_cost_usd = 2.5",
            "memory.capture_tools = off",
            "memory.recall_max_records = 4",
            "memory.user_scope = true",
            "cache_ttl = hybrid",
        ] {
            let problems = config_content_problems(good);
            assert!(problems.is_empty(), "{good}: {problems:?}");
        }
        // The family values still land exactly as before.
        let cfg = load_config_from_str("shell.max_sessions = 8\nevents.auto_turn = maybe\n");
        assert_eq!(cfg.shell.max_sessions, 8);
        assert!(!cfg.events.auto_turn, "unrecognised auto_turn still fails safe to false");
    }

    /// Every listed family key is accepted by its parser for some value
    /// (catches a typo in `FAMILY_CONFIG_KEYS`).
    #[test]
    fn family_config_keys_are_real_parser_keys() {
        let sample = |key: &str| -> &'static str {
            match key {
                "shell.readiness_strategy" => "hybrid",
                "memory.backend" => "legacy",
                "memory.user_scope" | "memory.default_mode_confirmed" => "true",
                "memory.default_mode" => "off",
                "memory.capture_tools" => "summary_only",
                "memory.capture_assistant" | "memory.capture_user" => "on",
                "memory.auto_consolidate" | "memory.local_embeddings" | "memory.gliner" => "off",
                "memory.axel.executable" | "memory.axel.brain" => "/opt/axel",
                "events.auto_turn" => "on",
                "server.allowed_origins" | "server.token" => "x",
                "server.auto_approve_confirms" | "bridge.heartbeat_mirror" => "false",
                "bridge.uds_path" => "/tmp/x.sock",
                "auth.remote_endpoint" | "auth.machine_token" => "x",
                _ => "7",
            }
        };
        for key in FAMILY_CONFIG_KEYS.iter().filter(|k| !k.ends_with(".*")) {
            assert!(!KNOWN_CONFIG_KEYS.contains(key), "{key} is listed twice");
            let content = format!("{key} = {}\n", sample(key));
            let problems = config_content_problems(&content);
            assert!(problems.is_empty(), "{key}: {problems:?}");
        }
    }

    #[test]
    #[serial]
    fn validate_config_edit_uses_the_real_parser_and_whole_file() {
        let home = make_test_home("validate-edit");
        let cfg = home.join(".synaps-cli/config");
        with_home(&home, || {
            // Single-key value checks.
            assert!(validate_config_edit("cache_ttl", "1h").is_ok());
            assert!(validate_config_edit("cache_ttl", "2h").is_err());
            assert!(validate_config_edit("shell.max_output", "big").is_err());
            assert!(validate_config_edit("memory.axel.brain", "relative/brain").is_err());
            assert!(validate_config_edit("memory.axel.brain", "/abs/brain.r8").is_ok());
            assert!(validate_config_edit("model", "a\nb").is_err());

            // Cross-key rules see the rest of the file.
            std::fs::write(&cfg, "context_management.rollover_tokens = 100000\n").unwrap();
            assert!(validate_config_edit("context_management.pressure_tokens", "90000").is_ok());
            assert!(validate_config_edit("context_management.pressure_tokens", "150000").is_err());
            std::fs::write(&cfg, "subagent.max_total = 8\n").unwrap();
            assert!(validate_config_edit("subagent.max_concurrent", "8").is_ok());
            assert!(validate_config_edit("subagent.max_concurrent", "9").is_err());
            std::fs::write(&cfg, "").unwrap();
            assert!(validate_config_edit("memory.default_mode", "recall_once").is_err());
            assert!(validate_config_edit("memory.default_mode", "off").is_ok());
            std::fs::write(&cfg, "memory.default_mode_confirmed = true\n").unwrap();
            assert!(validate_config_edit("memory.default_mode", "recall_once").is_ok());

            // A problem already in the file is not blamed on an unrelated edit.
            std::fs::write(&cfg, "cache_ttl = forever\n").unwrap();
            assert!(validate_config_edit("max_fps", "120").is_ok());
            // Validation never writes.
            assert_eq!(std::fs::read_to_string(&cfg).unwrap(), "cache_ttl = forever\n");
        });
        let _ = std::fs::remove_dir_all(&home);
    }
}