agentsec-core 0.5.0

//! Observability surface: introspect AgentSec's runtime state.
//!
//! Four entry points, each surfaced as a CLI subcommand and an MCP tool
//! by the umbrella crate:
//!
//! | Entry              | Role                                                                    |
//! |--------------------|-------------------------------------------------------------------------|
//! | [`info`]           | Crate version + resolved paths + env state with per-var provenance.     |
//! | [`status`]         | Runtime activity overview (file counts, latest timestamps, Plain Mode). |
//! | [`recent_activity`]| Tail of `paste_log/` and `web_log/` audit rows.                         |
//! | [`doctor`]         | Comprehensive health check (env / paths / hook wiring / MCP register).  |
//!
//! ## §Env provenance
//!
//! [`info`] reports four AgentSec-relevant env vars (`AGENTSEC_HOME`,
//! `HOME`, `ANTHROPIC_API_KEY`, `AGENTSEC_LLM_MODEL`) with the source
//! that produced the effective value:
//!
//! - **`Process`** — set in the process environment, not present in the
//!   loaded `.env` file (or no `.env` was loaded).
//! - **`DotenvFile { path, line }`** — defined in the `.env` file at the
//!   given line; `dotenvy` loaded it without overriding an existing
//!   process-env value (so this is the effective source for vars that
//!   were unset before load).
//! - **`DotenvFileShadowed { path, line }`** — defined in the `.env`
//!   file at the given line **but** the process env already had the
//!   var set; the process value wins (dotenvy is non-overriding by
//!   default).
//! - **`Default(value)`** — not set anywhere; AgentSec's builtin
//!   default applies.
//! - **`Unset`** — not set anywhere and no default applies (i.e. an
//!   optional var like `ANTHROPIC_API_KEY` left empty).
//!
//! Secret values (`ANTHROPIC_API_KEY`) are always reported in redacted
//! form (`sk-***<last-4>`); the raw value never enters the report.

use std::collections::{HashMap, HashSet};
use std::fs;
use std::path::{Path, PathBuf};

use serde::{Deserialize, Serialize};

use crate::Config;
use crate::config::DEFAULT_LLM_MODEL;
use crate::error::Result;

/// AgentSec env vars tracked by [`info`] and [`doctor`].
const TRACKED_ENV_VARS: &[&str] = &[
    "AGENTSEC_HOME",
    "HOME",
    "ANTHROPIC_API_KEY",
    "AGENTSEC_LLM_MODEL",
    "AGENTSEC_DOTENV",
];

/// Crate version embedded at compile time.
pub const VERSION: &str = env!("CARGO_PKG_VERSION");

// ── §info ────────────────────────────────────────────────────────────

/// Top-level info report.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InfoReport {
    /// `agentsec-core` crate version (semver).
    pub version: String,
    /// Resolved filesystem paths (see [`crate::Paths`]).
    pub paths: PathsInfo,
    /// Per-env-var status with provenance (see module docs §Env provenance).
    pub env: Vec<EnvVarStatus>,
}

/// Display-friendly path bundle.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PathsInfo {
    pub home: PathBuf,
    pub user_home: PathBuf,
    pub snapshots: PathBuf,
    pub scans: PathBuf,
    pub web_log: PathBuf,
    pub paste_log: PathBuf,
}

/// One env var's effective state + provenance.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EnvVarStatus {
    pub key: String,
    pub source: EnvSource,
    /// Effective value, redacted for secrets. `None` if unset.
    pub value_display: Option<String>,
}

/// Where the effective env value came from.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum EnvSource {
    /// Set in process environment, not declared in the loaded `.env`.
    Process,
    /// Declared in the loaded `.env` file at the given 1-based line, and
    /// either the process env had no prior value (so dotenv's value
    /// became effective) or the file was loaded explicitly via
    /// `AGENTSEC_DOTENV`.
    DotenvFile { path: PathBuf, line: usize },
    /// Declared in the loaded `.env` but shadowed by an existing
    /// process-env value (dotenvy is non-overriding by default; the
    /// process value wins, the file value is dead weight).
    DotenvFileShadowed { path: PathBuf, line: usize },
    /// Not set anywhere; AgentSec's builtin default applies.
    Default(String),
    /// Not set anywhere and no default applies (optional var).
    Unset,
}

/// Build an [`InfoReport`] from a resolved [`Config`] and the live
/// process environment.
///
/// Reads `cfg.dotenv_path` (if any) to determine which keys came from
/// the dotenv file vs the process environment.
pub fn info(cfg: &Config) -> InfoReport {
    let paths = PathsInfo {
        home: cfg.paths.home.clone(),
        user_home: cfg.paths.user_home.clone(),
        snapshots: cfg.paths.snapshots(),
        scans: cfg.paths.scans(),
        web_log: cfg.paths.web_log(),
        paste_log: cfg.paths.paste_log(),
    };

    let dotenv_keys = cfg
        .dotenv_path
        .as_ref()
        .and_then(|p| parse_dotenv(p).ok())
        .unwrap_or_default();

    let env = TRACKED_ENV_VARS
        .iter()
        .map(|key| classify_env_var(key, &dotenv_keys, cfg.dotenv_path.as_deref()))
        .collect();

    InfoReport {
        version: VERSION.to_string(),
        paths,
        env,
    }
}

/// (key, 1-based line number) pairs parsed from a `.env` file.
type DotenvKeys = HashMap<String, usize>;

/// Parse a `.env` file into a `key → line-number` map. Best-effort:
/// blank lines, comments, and malformed lines are skipped. Returns
/// `Err` only on file read failure.
fn parse_dotenv(path: &Path) -> Result<DotenvKeys> {
    let body = fs::read_to_string(path)?;
    let mut out = DotenvKeys::new();
    for (idx, raw) in body.lines().enumerate() {
        let trimmed = raw.trim_start();
        if trimmed.is_empty() || trimmed.starts_with('#') {
            continue;
        }
        // Strip optional `export ` prefix.
        let after_export = trimmed.strip_prefix("export ").unwrap_or(trimmed);
        let Some(eq_idx) = after_export.find('=') else {
            continue;
        };
        let key = after_export[..eq_idx].trim().to_string();
        if !is_valid_env_key(&key) {
            continue;
        }
        // Preserve only the first occurrence per key.
        out.entry(key).or_insert(idx + 1);
    }
    Ok(out)
}

fn is_valid_env_key(s: &str) -> bool {
    !s.is_empty()
        && s.chars()
            .next()
            .is_some_and(|c| c.is_ascii_alphabetic() || c == '_')
        && s.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
}

fn classify_env_var(
    key: &str,
    dotenv_keys: &DotenvKeys,
    dotenv_path: Option<&Path>,
) -> EnvVarStatus {
    let in_dotenv_line = dotenv_keys.get(key).copied();
    let process_value = std::env::var(key).ok();

    let (source, value_display) = match (process_value, in_dotenv_line, dotenv_path) {
        (Some(v), Some(line), Some(path)) => {
            // Effective value comes from dotenv only if the process env
            // had no prior value — but dotenv has already loaded into
            // process env at this point, so we cannot distinguish
            // pre-load process env from post-load. Conservative choice:
            // if the key was in the dotenv file, attribute the source
            // to the dotenv file (this matches the typical "I just set
            // it in my .env" mental model). The `DotenvFileShadowed`
            // variant is reserved for callers who pre-snapshot the env
            // (not done here — see module docs §Env provenance for the
            // wire contract).
            (
                EnvSource::DotenvFile {
                    path: path.to_path_buf(),
                    line,
                },
                Some(display_value(key, &v)),
            )
        }
        // (Some(v), Some(_), None) is unreachable in practice — a
        // non-empty dotenv_line implies a dotenv_path was loaded — but
        // we collapse it into the Process arm so the match stays
        // exhaustive without an identical-body sibling.
        (Some(v), None, _) | (Some(v), Some(_), None) => {
            (EnvSource::Process, Some(display_value(key, &v)))
        }
        (None, Some(line), Some(path)) => (
            EnvSource::DotenvFile {
                path: path.to_path_buf(),
                line,
            },
            None,
        ),
        (None, None, _) | (None, Some(_), None) => match default_for(key) {
            Some(d) => (EnvSource::Default(d.clone()), Some(d)),
            None => (EnvSource::Unset, None),
        },
    };

    EnvVarStatus {
        key: key.to_string(),
        source,
        value_display,
    }
}

fn default_for(key: &str) -> Option<String> {
    match key {
        "AGENTSEC_LLM_MODEL" => Some(DEFAULT_LLM_MODEL.to_string()),
        _ => None,
    }
}

fn display_value(key: &str, raw: &str) -> String {
    if is_secret_key(key) {
        redact(raw)
    } else {
        raw.to_string()
    }
}

fn is_secret_key(key: &str) -> bool {
    matches!(key, "ANTHROPIC_API_KEY")
}

fn redact(value: &str) -> String {
    if value.is_empty() {
        return "<empty>".to_string();
    }
    let chars: Vec<char> = value.chars().collect();
    if chars.len() <= 8 {
        return "***".to_string();
    }
    let tail: String = chars[chars.len().saturating_sub(4)..].iter().collect();
    format!("***{tail} (len={})", chars.len())
}

// ── §status ──────────────────────────────────────────────────────────

/// One row of the Storage section: where audit data physically lives.
///
/// `path` is always absolute. `count` is the number of audit entries
/// (files in the dir, or 1 for single-file kinds when the file
/// exists). `size_bytes` is the total on-disk footprint for the kind
/// (sum of regular-file sizes for dir kinds, file size for single-file
/// kinds). `latest` is the most recent entry name (for dir kinds) or
/// the file's mtime as ISO-8601 (for single-file kinds), or `None`
/// when the storage location is absent.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StorageItem {
    pub kind: String,
    pub path: PathBuf,
    pub count: usize,
    pub size_bytes: u64,
    pub latest: Option<String>,
}

/// Runtime activity snapshot.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StatusReport {
    pub snapshots_count: usize,
    pub latest_snapshot: Option<String>,
    pub paste_log_count: usize,
    pub web_log_count: usize,
    pub plain_mode_active: bool,
    pub plain_mode_entries: usize,
    pub registry_entries: usize,
    /// Per-kind storage rows: where data lives and how big it is.
    /// Surfaced so users can manage retention without `du` / `find`.
    #[serde(default)]
    pub storage: Vec<StorageItem>,
}

/// Build a [`StatusReport`] from the on-disk state at `cfg.paths`.
///
/// All I/O is read-only. Missing directories are reported as zero
/// counts rather than errors.
pub fn status(cfg: &Config) -> StatusReport {
    use crate::plain_mode;
    use crate::registry::Registry;

    let snapshots_dir = cfg.paths.snapshots();
    let (snapshots_count, latest_snapshot) = count_and_latest(&snapshots_dir);
    let paste_log_count = count_files(&cfg.paths.paste_log());
    let web_log_count = count_files(&cfg.paths.web_log());

    let plain = plain_mode::status(&cfg.paths).unwrap_or_else(|_| plain_mode::PlainStatus {
        active: false,
        entries: Vec::new(),
        ledger_path: cfg.paths.home.join(plain_mode::PLAIN_LEDGER_FILENAME),
    });

    let registry_entries = Registry::load_or_builtin(&cfg.paths).len();

    let storage = collect_storage(cfg);

    StatusReport {
        snapshots_count,
        latest_snapshot,
        paste_log_count,
        web_log_count,
        plain_mode_active: plain.active,
        plain_mode_entries: plain.entries.len(),
        registry_entries,
        storage,
    }
}

/// Build the per-kind Storage rows surfaced under `status`'s `Storage`
/// section.
///
/// Each row is read-only: missing dirs/files report zero count + zero
/// size + `None` latest.
fn collect_storage(cfg: &Config) -> Vec<StorageItem> {
    let home = &cfg.paths.home;
    vec![
        dir_storage("snapshots", &cfg.paths.snapshots()),
        dir_storage("paste_log", &cfg.paths.paste_log()),
        dir_storage("web_log", &cfg.paths.web_log()),
        dir_storage("scans", &cfg.paths.scans()),
        file_storage(
            "plain ledger",
            home.join(crate::plain_mode::PLAIN_LEDGER_FILENAME),
        ),
        file_storage("registry cache", home.join("registry.json")),
        file_storage("registry local", home.join("registry-local.json")),
    ]
}

fn dir_storage(kind: &str, path: &Path) -> StorageItem {
    let (count, size_bytes, latest) = match fs::read_dir(path) {
        Err(_) => (0, 0, None),
        Ok(entries) => {
            let mut names: Vec<String> = Vec::new();
            let mut total: u64 = 0;
            for e in entries.flatten() {
                if let Ok(md) = e.metadata()
                    && md.is_file()
                {
                    total = total.saturating_add(md.len());
                    if let Some(name) = e.file_name().to_str() {
                        names.push(name.to_string());
                    }
                }
            }
            let count = names.len();
            names.sort();
            (count, total, names.last().cloned())
        }
    };
    StorageItem {
        kind: kind.to_string(),
        path: path.to_path_buf(),
        count,
        size_bytes,
        latest,
    }
}

fn file_storage(kind: &str, path: PathBuf) -> StorageItem {
    let (count, size_bytes, latest) = match fs::metadata(&path) {
        Ok(md) if md.is_file() => {
            let size = md.len();
            let latest = md.modified().ok().and_then(|t| {
                t.duration_since(std::time::UNIX_EPOCH)
                    .ok()
                    .map(|d| format!("epoch={}", d.as_secs()))
            });
            (1, size, latest)
        }
        _ => (0, 0, None),
    };
    StorageItem {
        kind: kind.to_string(),
        path,
        count,
        size_bytes,
        latest,
    }
}

/// Format a byte count as a short human-readable string.
/// Integer-only math (no f64) to avoid clippy precision-loss lint.
pub fn format_size(bytes: u64) -> String {
    const KB: u64 = 1024;
    const MB: u64 = KB * 1024;
    const GB: u64 = MB * 1024;
    let (unit, scale) = if bytes >= GB {
        ("GB", GB)
    } else if bytes >= MB {
        ("MB", MB)
    } else if bytes >= KB {
        ("KB", KB)
    } else {
        return format!("{bytes} B");
    };
    let whole = bytes / scale;
    let tenth = (bytes % scale) * 10 / scale;
    format!("{whole}.{tenth} {unit}")
}

fn count_files(dir: &Path) -> usize {
    fs::read_dir(dir)
        .map(std::iter::Iterator::count)
        .unwrap_or(0)
}

fn count_and_latest(dir: &Path) -> (usize, Option<String>) {
    let Ok(entries) = fs::read_dir(dir) else {
        return (0, None);
    };
    let mut names: Vec<String> = entries
        .filter_map(std::result::Result::ok)
        .filter_map(|e| {
            let p = e.path();
            if p.extension()
                .is_some_and(|ext| ext.eq_ignore_ascii_case("json"))
            {
                e.file_name().to_str().map(std::string::ToString::to_string)
            } else {
                None
            }
        })
        .collect();
    let count = names.len();
    names.sort();
    (count, names.last().cloned())
}

// ── §recent_activity ─────────────────────────────────────────────────

/// Tail of audit log files. `n` of each kind (paste / web).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RecentActivityReport {
    pub paste: Vec<AuditTail>,
    pub web: Vec<AuditTail>,
}

/// One audit-log row excerpt.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AuditTail {
    /// File basename (e.g. `2026-06-17-110203-abcdef12.json`).
    pub filename: String,
    /// File size in bytes (cheap stat).
    pub size: u64,
    /// First ~200 chars of the file's content (defensive truncation —
    /// audit rows are normally small but we cap to avoid blowing up
    /// the response on a runaway log).
    pub excerpt: String,
}

/// Read the last `n` files (by filename order, which is timestamped) of
/// `paste_log/` and `web_log/` and return their excerpts.
pub fn recent_activity(cfg: &Config, n: usize) -> RecentActivityReport {
    RecentActivityReport {
        paste: tail_dir(&cfg.paths.paste_log(), n),
        web: tail_dir(&cfg.paths.web_log(), n),
    }
}

const AUDIT_EXCERPT_CHARS: usize = 200;
/// Number of context lines kept on each side of the "anchor" line.
const EXCERPT_CONTEXT_LINES: usize = 2;

fn tail_dir(dir: &Path, n: usize) -> Vec<AuditTail> {
    let Ok(entries) = fs::read_dir(dir) else {
        return Vec::new();
    };
    let mut files: Vec<(String, PathBuf)> = entries
        .filter_map(std::result::Result::ok)
        .filter_map(|e| {
            let p = e.path();
            if !p
                .extension()
                .is_some_and(|ext| ext.eq_ignore_ascii_case("json"))
            {
                return None;
            }
            let name = e.file_name().to_str()?.to_string();
            Some((name, e.path()))
        })
        .collect();
    files.sort_by(|(a, _), (b, _)| a.cmp(b));
    files
        .into_iter()
        .rev()
        .take(n)
        .map(|(name, path)| AuditTail {
            filename: name,
            size: fs::metadata(&path).map(|m| m.len()).unwrap_or(0),
            excerpt: read_excerpt(&path),
        })
        .collect()
}

/// Build a ±2-line excerpt around the most "interesting" line, capped at
/// [`AUDIT_EXCERPT_CHARS`] characters.
///
/// The "anchor" line is the longest non-brace-only line in the file
/// (heuristic that picks the first substantive field in compact JSON audit
/// rows like those written by `paste::detect` and `web::fetch_and_sanitize`).
/// Surrounding context lines (±2) are joined with `\n`.  The result is
/// hard-truncated to [`AUDIT_EXCERPT_CHARS`] chars with a `…` suffix if
/// needed.
fn read_excerpt(path: &Path) -> String {
    let Ok(body) = fs::read_to_string(path) else {
        return String::new();
    };
    let lines: Vec<&str> = body.lines().collect();
    if lines.is_empty() {
        return String::new();
    }
    // Find anchor: longest line that is not a bare `{` or `}`.
    let anchor = lines
        .iter()
        .enumerate()
        .filter(|(_, l)| {
            let t = l.trim();
            t != "{" && t != "}" && !t.is_empty()
        })
        .max_by_key(|(_, l)| l.len())
        .map_or(0, |(i, _)| i);
    let start = anchor.saturating_sub(EXCERPT_CONTEXT_LINES);
    let end = (anchor + EXCERPT_CONTEXT_LINES + 1).min(lines.len());
    let joined = lines[start..end].join("\n");
    if joined.chars().count() <= AUDIT_EXCERPT_CHARS {
        joined
    } else {
        let truncated: String = joined.chars().take(AUDIT_EXCERPT_CHARS).collect();
        format!("{truncated}…")
    }
}

// ── §doctor ──────────────────────────────────────────────────────────

/// Health-check report: one row per check, each PASS / WARN / FAIL.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DoctorReport {
    pub checks: Vec<DoctorCheck>,
}

/// One health check row.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DoctorCheck {
    pub name: String,
    pub status: DoctorStatus,
    pub message: String,
}

/// Three-level check verdict.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub enum DoctorStatus {
    /// Working as expected.
    Pass,
    /// Non-fatal: a feature is unavailable but degraded operation is OK
    /// (e.g. `ANTHROPIC_API_KEY` unset ⇒ semantic sanitize layer fails
    /// open).
    Warn,
    /// Misconfiguration that prevents normal operation.
    Fail,
}

/// Run all health checks and return the aggregated report.
///
/// Checks (in order):
///
/// 1. Binary version.
/// 2. `<home>/` directory: present + writable.
/// 3. Subdirs (snapshots / scans / web_log / paste_log) creatable.
/// 4. `AGENTSEC_DOTENV` resolution.
/// 5. `ANTHROPIC_API_KEY` set (WARN if unset).
/// 6. Claude Code MCP server registration (`agentsec` in
///    `~/.claude.json` top-level or any project block).
/// 7. Claude Code hook wiring (`UserPromptSubmit` /
///    `SessionStart` entries in `~/.claude/settings.json`).
pub fn doctor(cfg: &Config) -> DoctorReport {
    let mut checks = Vec::new();

    checks.push(DoctorCheck {
        name: "binary version".into(),
        status: DoctorStatus::Pass,
        message: format!("agentsec-core {VERSION}"),
    });

    checks.push(check_home_writable(cfg));
    checks.extend(check_subdirs(cfg));
    checks.push(check_dotenv(cfg));
    checks.push(check_api_key(cfg));
    checks.extend(check_mcp_registration(cfg));
    checks.extend(check_hook_wiring(cfg));

    DoctorReport { checks }
}

fn check_home_writable(cfg: &Config) -> DoctorCheck {
    let home = &cfg.paths.home;
    if let Err(e) = fs::create_dir_all(home) {
        return DoctorCheck {
            name: "home dir".into(),
            status: DoctorStatus::Fail,
            message: format!("cannot create {}: {e}", home.display()),
        };
    }
    let probe = home.join(".agentsec-doctor-probe");
    match fs::write(&probe, b"probe") {
        Ok(()) => {
            let _ = fs::remove_file(&probe);
            DoctorCheck {
                name: "home dir".into(),
                status: DoctorStatus::Pass,
                message: format!("{} is writable", home.display()),
            }
        }
        Err(e) => DoctorCheck {
            name: "home dir".into(),
            status: DoctorStatus::Fail,
            message: format!("{} is not writable: {e}", home.display()),
        },
    }
}

fn check_subdirs(cfg: &Config) -> Vec<DoctorCheck> {
    let p = &cfg.paths;
    vec![
        check_subdir_creatable("snapshots dir", &p.snapshots()),
        check_subdir_creatable("scans dir", &p.scans()),
        check_subdir_creatable("web_log dir", &p.web_log()),
        check_subdir_creatable("paste_log dir", &p.paste_log()),
    ]
}

fn check_subdir_creatable(name: &str, path: &Path) -> DoctorCheck {
    match fs::create_dir_all(path) {
        Ok(()) => DoctorCheck {
            name: name.to_string(),
            status: DoctorStatus::Pass,
            message: format!("{} present", path.display()),
        },
        Err(e) => DoctorCheck {
            name: name.to_string(),
            status: DoctorStatus::Fail,
            message: format!("cannot create {}: {e}", path.display()),
        },
    }
}

fn check_dotenv(cfg: &Config) -> DoctorCheck {
    match &cfg.dotenv_path {
        Some(p) if p.exists() => DoctorCheck {
            name: "dotenv".into(),
            status: DoctorStatus::Pass,
            message: format!("loaded {}", p.display()),
        },
        Some(p) => DoctorCheck {
            name: "dotenv".into(),
            status: DoctorStatus::Warn,
            message: format!("recorded dotenv path missing on disk: {}", p.display()),
        },
        None => DoctorCheck {
            name: "dotenv".into(),
            status: DoctorStatus::Warn,
            message: "no .env loaded (process env only)".into(),
        },
    }
}

fn check_api_key(cfg: &Config) -> DoctorCheck {
    if cfg.llm.api_key.is_some() {
        DoctorCheck {
            name: "anthropic api key".into(),
            status: DoctorStatus::Pass,
            message: "set; semantic sanitize layer enabled".into(),
        }
    } else {
        DoctorCheck {
            name: "anthropic api key".into(),
            status: DoctorStatus::Warn,
            message: "unset; semantic sanitize layer is no-op (regex layer still active)".into(),
        }
    }
}

/// Returns one PASS row per registration site found (or one FAIL row if
/// none).
fn check_mcp_registration(cfg: &Config) -> Vec<DoctorCheck> {
    let path = cfg.paths.user_home.join(".claude.json");
    if !path.exists() {
        return vec![DoctorCheck {
            name: "mcp registration".into(),
            status: DoctorStatus::Warn,
            message: format!(
                "{} not found; cannot verify Claude Code MCP wiring",
                path.display()
            ),
        }];
    }
    let body = match fs::read_to_string(&path) {
        Ok(b) => b,
        Err(e) => {
            return vec![DoctorCheck {
                name: "mcp registration".into(),
                status: DoctorStatus::Warn,
                message: format!("cannot read {}: {e}", path.display()),
            }];
        }
    };
    let json: serde_json::Value = match serde_json::from_str(&body) {
        Ok(v) => v,
        Err(e) => {
            return vec![DoctorCheck {
                name: "mcp registration".into(),
                status: DoctorStatus::Warn,
                message: format!("{} is not valid JSON: {e}", path.display()),
            }];
        }
    };

    let mut sites = Vec::new();
    if json
        .get("mcpServers")
        .and_then(|v| v.get("agentsec"))
        .is_some()
    {
        sites.push("user-scope (.claude.json:mcpServers.agentsec)".to_string());
    }
    if let Some(projects) = json.get("projects").and_then(|v| v.as_object()) {
        for (proj, val) in projects {
            if val
                .get("mcpServers")
                .and_then(|v| v.get("agentsec"))
                .is_some()
            {
                sites.push(format!("project-scope ({proj})"));
            }
        }
    }

    if sites.is_empty() {
        vec![DoctorCheck {
            name: "mcp registration".into(),
            status: DoctorStatus::Fail,
            message: "agentsec not registered anywhere in .claude.json; run `claude mcp add agentsec -s user -- agentsec mcp`".into(),
        }]
    } else {
        sites
            .into_iter()
            .map(|site| DoctorCheck {
                name: "mcp registration".into(),
                status: DoctorStatus::Pass,
                message: format!("registered at {site}"),
            })
            .collect()
    }
}

/// Returns one row per hook (UserPromptSubmit / SessionStart) reporting
/// whether `agentsec hook <name>` is wired into
/// `~/.claude/settings.json`.
fn check_hook_wiring(cfg: &Config) -> Vec<DoctorCheck> {
    let path = cfg.paths.user_home.join(".claude/settings.json");
    if !path.exists() {
        return vec![DoctorCheck {
            name: "hook wiring".into(),
            status: DoctorStatus::Warn,
            message: format!(
                "{} not found; cannot verify Claude Code hook wiring",
                path.display()
            ),
        }];
    }
    let body = match fs::read_to_string(&path) {
        Ok(b) => b,
        Err(e) => {
            return vec![DoctorCheck {
                name: "hook wiring".into(),
                status: DoctorStatus::Warn,
                message: format!("cannot read {}: {e}", path.display()),
            }];
        }
    };
    let json: serde_json::Value = match serde_json::from_str(&body) {
        Ok(v) => v,
        Err(e) => {
            return vec![DoctorCheck {
                name: "hook wiring".into(),
                status: DoctorStatus::Warn,
                message: format!("{} is not valid JSON: {e}", path.display()),
            }];
        }
    };

    let wired = collect_wired_hooks(&json);
    let expected = ["user-prompt-submit", "session-start"];
    expected
        .iter()
        .map(|name| {
            let full = format!("agentsec hook {name}");
            if wired.contains((*name).to_string().as_str()) {
                DoctorCheck {
                    name: format!("hook: {name}"),
                    status: DoctorStatus::Pass,
                    message: format!("`{full}` is wired in settings.json"),
                }
            } else {
                DoctorCheck {
                    name: format!("hook: {name}"),
                    status: DoctorStatus::Warn,
                    message: format!(
                        "`{full}` not wired; add it under hooks.{} in {}",
                        hook_key_for(name),
                        path.display()
                    ),
                }
            }
        })
        .collect()
}

/// Scan `hooks.<HookKey>[].hooks[].command` for `agentsec hook <name>`
/// substrings; return the set of hook short-names actually wired.
pub(crate) fn collect_wired_hooks(json: &serde_json::Value) -> HashSet<String> {
    let mut out = HashSet::new();
    let Some(hooks) = json.get("hooks").and_then(|v| v.as_object()) else {
        return out;
    };
    for matcher_list in hooks.values() {
        let Some(matchers) = matcher_list.as_array() else {
            continue;
        };
        for matcher in matchers {
            let Some(inner) = matcher.get("hooks").and_then(|v| v.as_array()) else {
                continue;
            };
            for hook in inner {
                if let Some(cmd) = hook.get("command").and_then(|v| v.as_str())
                    && let Some(name) = extract_hook_name(cmd)
                {
                    out.insert(name);
                }
            }
        }
    }
    out
}

pub(crate) fn extract_hook_name(cmd: &str) -> Option<String> {
    // Looking for `agentsec hook <name>` (allow leading path components
    // like `~/.cargo/bin/agentsec hook <name>`).
    let needle = "agentsec hook ";
    let idx = cmd.find(needle)?;
    let after = &cmd[idx + needle.len()..];
    let name = after.split_whitespace().next()?;
    Some(name.to_string())
}

pub(crate) fn hook_key_for(name: &str) -> &'static str {
    match name {
        "user-prompt-submit" => "UserPromptSubmit",
        "session-start" => "SessionStart",
        _ => "(unknown)",
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::Paths;

    fn cfg_for(tmp: &tempfile::TempDir, dotenv: Option<PathBuf>) -> Config {
        Config {
            paths: Paths {
                home: tmp.path().to_path_buf(),
                user_home: tmp.path().to_path_buf(),
            },
            llm: crate::LlmConfig {
                api_key: None,
                model: DEFAULT_LLM_MODEL.into(),
            },
            paste: crate::config::PasteConfig::default(),
            web: crate::config::WebConfig::default(),
            dotenv_path: dotenv,
        }
    }

    #[test]
    fn parse_dotenv_picks_up_keys_with_line_numbers() {
        let tmp = tempfile::tempdir().unwrap();
        let p = tmp.path().join(".env");
        fs::write(
            &p,
            "# comment\nFOO=bar\nexport BAZ=qux\n\n# another\nQUUX=zap\n",
        )
        .unwrap();
        let keys = parse_dotenv(&p).unwrap();
        assert_eq!(keys.get("FOO"), Some(&2));
        assert_eq!(keys.get("BAZ"), Some(&3));
        assert_eq!(keys.get("QUUX"), Some(&6));
    }

    #[test]
    fn redact_short_secret_is_three_stars() {
        assert_eq!(redact("short"), "***");
    }

    #[test]
    fn redact_long_secret_shows_last_four_and_length() {
        let out = redact("sk-ant-12345-very-long-api-key-zzzz");
        assert!(out.starts_with("***"));
        assert!(out.contains("zzzz"));
        assert!(out.contains("len="));
    }

    #[test]
    fn doctor_runs_without_panicking_on_empty_tempdir() {
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        let report = doctor(&cfg);
        assert!(!report.checks.is_empty());
        // home dir check should PASS (tempdir is writable).
        let home_check = report.checks.iter().find(|c| c.name == "home dir").unwrap();
        assert_eq!(home_check.status, DoctorStatus::Pass);
    }

    #[test]
    fn status_reports_zero_for_empty_tempdir() {
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        let s = status(&cfg);
        assert_eq!(s.snapshots_count, 0);
        assert_eq!(s.paste_log_count, 0);
        assert_eq!(s.web_log_count, 0);
        assert!(!s.plain_mode_active);
        // builtin registry has >0 entries
        assert!(s.registry_entries > 0);
    }

    #[test]
    fn status_storage_section_has_all_kinds() {
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        let s = status(&cfg);
        // 7 known kinds: snapshots, paste_log, web_log, scans, plain ledger,
        // registry cache, registry local.
        let kinds: Vec<&str> = s.storage.iter().map(|i| i.kind.as_str()).collect();
        assert!(kinds.contains(&"snapshots"));
        assert!(kinds.contains(&"paste_log"));
        assert!(kinds.contains(&"web_log"));
        assert!(kinds.contains(&"scans"));
        assert!(kinds.contains(&"plain ledger"));
        assert!(kinds.contains(&"registry cache"));
        assert!(kinds.contains(&"registry local"));
        // Empty tempdir: all dirs missing → count/size are zero.
        for item in &s.storage {
            assert_eq!(
                item.count, 0,
                "kind {} count must be 0 on empty home",
                item.kind
            );
            assert_eq!(
                item.size_bytes, 0,
                "kind {} size must be 0 on empty home",
                item.kind
            );
            // Paths are absolute (under tempdir/home).
            assert!(
                item.path.is_absolute(),
                "kind {} path must be absolute",
                item.kind
            );
        }
    }

    #[test]
    fn status_storage_picks_up_paste_log_files() {
        use std::fs;
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        let paste_dir = cfg.paths.paste_log();
        fs::create_dir_all(&paste_dir).unwrap();
        fs::write(paste_dir.join("aaa.json"), "{}").unwrap();
        fs::write(paste_dir.join("bbb.json"), "{\"x\":1}").unwrap();
        let s = status(&cfg);
        let paste = s.storage.iter().find(|i| i.kind == "paste_log").unwrap();
        assert_eq!(paste.count, 2);
        assert!(
            paste.size_bytes >= 9,
            "two small JSON files should sum to ≥9 bytes"
        );
        assert_eq!(paste.latest.as_deref(), Some("bbb.json"));
    }

    #[test]
    fn format_size_reports_units() {
        use crate::diagnostics::format_size;
        assert_eq!(format_size(0), "0 B");
        assert_eq!(format_size(512), "512 B");
        assert_eq!(format_size(1024), "1.0 KB");
        assert_eq!(format_size(1536), "1.5 KB");
        assert_eq!(format_size(1024 * 1024), "1.0 MB");
        assert_eq!(format_size(1024 * 1024 * 1024), "1.0 GB");
    }

    #[test]
    fn info_reports_env_with_default_for_unset_model() {
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        // Ensure AGENTSEC_LLM_MODEL is unset for this test; we can't
        // mutate process env safely in unit tests, so we rely on the
        // test runner's env not setting it.
        let report = info(&cfg);
        let model = report
            .env
            .iter()
            .find(|e| e.key == "AGENTSEC_LLM_MODEL")
            .unwrap();
        // Either unset (→ Default) or actually set in CI env; both are
        // acceptable. The point is the row exists with a source.
        match &model.source {
            EnvSource::Default(v) => assert_eq!(v, DEFAULT_LLM_MODEL),
            EnvSource::Process | EnvSource::DotenvFile { .. } => { /* CI / dev env override */ }
            other => panic!("unexpected source for AGENTSEC_LLM_MODEL: {other:?}"),
        }
    }

    #[test]
    fn doctor_flags_missing_claude_json_with_warn_not_fail() {
        let tmp = tempfile::tempdir().unwrap();
        let cfg = cfg_for(&tmp, None);
        let report = doctor(&cfg);
        let mcp = report
            .checks
            .iter()
            .find(|c| c.name == "mcp registration")
            .unwrap();
        // tempdir has no .claude.json ⇒ Warn (can't verify), not Fail.
        assert_eq!(mcp.status, DoctorStatus::Warn);
    }

    #[test]
    fn extract_hook_name_handles_full_path() {
        assert_eq!(
            extract_hook_name("/Users/x/.cargo/bin/agentsec hook user-prompt-submit"),
            Some("user-prompt-submit".to_string())
        );
        assert_eq!(
            extract_hook_name("agentsec hook session-start"),
            Some("session-start".to_string())
        );
        assert_eq!(extract_hook_name("python3 something.py"), None);
    }
}