rpi_cli/

interactive_tui.rs

//! Interactive mode for pi-cli.
//!
//! Full-screen terminal UI with a streaming transcript, an editor, a live
//! status indicator, and tool-execution display. Mirrors the TypeScript
//! `packages/coding-agent/src/modes/interactive/interactive-mode.ts` event→UI
//! mapping (`handleEvent`), driven by the live `AgentEvent` stream the harness
//! emits via the `BroadcastEmitter` installed in [`crate::session`].
//!
//! This host module owns startup and input dispatch. Feature implementations live
//! in `interactive_tui/`: commands, extensions, settings, sessions, state, run,
//! events, selectors, autocomplete, and rendering. Regression tests live in tests.rs.
//!
//! Key architecture facts (see the initial port notes (retired)):
//! - `TuiAltScreen::start()` still has a readerless companion, so this module
//!   owns a `spawn_blocking` crossterm `read()` loop for key dispatch and a
//!   `tokio::spawn` task that drains `broadcast::Receiver<AgentEvent>` into UI
//!   mutations.
//! - The layout root is built ONCE at startup (mirrors the TS
//!   `fullscreenLayoutRoot`); per-message we mutate only `chat_container` /
//!   `status_container` / `autocomplete_container` children and call
//!   `request_render(false)` so the differential renderer repaints just the
//!   changed rows.
//! - Selectors (`/model` `/session` `/theme`) are implemented by **swapping the
//!   `editor_container` child** (the TS `showSelector` swap pattern,
//!   `interactive-mode.ts:4354-4377`) — the `show_overlay` stub is avoided
//!   entirely. An `active_selector` state field holds the live `SelectList`;
//!   while it is `Some` the key loop routes to it first and restores the editor
//!   on done/cancel.

// Feature modules share the host state; their helpers stay private to this TUI.
mod extensions;
use extensions::*;
mod commands;
use commands::*;
mod settings;
use settings::*;
mod sessions;
use sessions::*;
mod run;
use run::*;
mod events;
use events::*;
mod selectors;
use selectors::*;
mod autocomplete;
use autocomplete::*;
mod rendering;
use rendering::*;

#[cfg(test)]
mod tests;

mod state;
use state::*;

use std::collections::HashMap;
use std::io::IsTerminal;
use std::sync::{Arc, Mutex};

use base64::Engine;
use crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
use tokio::sync::{broadcast, mpsc};
use tokio_util::sync::CancellationToken;

use rpi_agent::{AgentEvent, AgentMessage};
use rpi_ai::types::{AssistantMessage, Content, UserMessage};
use rpi_harness::agent_harness::{AgentHarness, AgentLane, HarnessRunOutcome};
use rpi_harness::session::types::{Entry, EntryOrder, EntryQuery};
use rpi_tui::scroll_view::{OverscrollMode, ScrollbarMode};
#[cfg(test)]
use rpi_tui::strip_ansi;
use rpi_tui::{
    apply_theme_preset, AltScreenSearch, AssistantBlock, AssistantMessageComponent,
    AssistantMessageOptions, AutocompleteManager, AutocompleteSuggestions, BashExecutionComponent,
    BashTruncation, CombinedAutocompleteProvider, Component, Container, DynamicBorder, Editor,
    EditorOptions, EditorStyle, FilePathAutocompleteProvider, Focusable, FollowMode,
    FooterComponent, Image, ImageOptions, Input, Loader, Markdown, ProcessTerminal, ScrollView,
    ScrollViewOptions, SearchBar, SearchableSelectList, SelectItem, SelectList, SettingItem,
    SettingsList, SlashCommand as SlashCommandEntry, SlashCommandAutocompleteProvider, Spacer,
    StackChild, StackEntry, StatusIndicator, Text, ThemeManager, ThemePreset,
    ToolExecutionComponent, ToolStatus, TuiAltScreen, UserMessageComponent, VStack, WorkingState,
    TUI,
};
use rpi_tui::{bold as tui_bold, theme as current_theme};

#[allow(unused_imports)]
use rpi_tui::BashStatus;

use crate::args::Args;
use crate::session_driver::{assistant_blocks, assistant_tool_calls};
use crate::transcript_view::UiEvent;

/// B5e: the markdown-transformer trait object the assistant-message render path
/// applies to raw text BEFORE the [`Markdown`] renderer styles it. A plain
/// `Fn(&str) -> String` (NO `rpi-extensions` types) so `rpi-tui` stays free of
/// an `rpi-extensions` dep — `rpi-cli` (which already depends on
/// `rpi-extensions`) builds the closure from the live `RegistrySnapshot` and
/// hands the trait object to `AssistantMessageComponent::set_markdown_transformer`.
type MarkdownTransformer = Arc<dyn Fn(&str) -> String + Send + Sync>;

/// A synchronous rendezvous between the Node runtime-request thread and the
/// blocking TUI key loop. Node's `ctx.ui.*` methods are promises, so the host
/// request must remain pending while the user interacts with the native
/// B5e: build the `AssistantMessageComponent` markdown-transformer closure the
/// render path applies to raw assistant text before styling. Wraps any plugin
/// `register_markdown_transformer` handlers registered in `snapshot` (chained
/// in registration order: each handler's output feeds the next). `None` when
/// no markdown transformers are registered (the component defaults to the
/// identity transform + this avoids a closure allocation on the hot render
/// path).
///
/// The closure captures an `Arc<RegistrySnapshot>` clone so it outlives the
/// borrow that built it (the snapshot's `active` flag guards dispatch in
/// `emit_resources_discover`/event translation; a reloaded session's old
/// snapshot flips false, so a stale closure no-ops rather than driving a
/// half-swapped registry — the transformer falls back to the input unchanged
/// on an inactive snapshot, matching the plugin's per-handler skip-on-error).
///
/// This is the cycle-free seam: `rpi-tui` takes a `Fn(&str) -> String` trait
/// object (no `rpi-extensions` dep); `rpi-cli` (which already depends on
/// `rpi-extensions`) builds the closure from the live `RegistrySnapshot`. The
/// calling pattern mirrors `plugin_stub_smoke.rs`'s direct `RenderFn` round-
/// trip (input `{"markdown":…}` → `render_fn` → reclaim `out` via the plugin's
/// `free_string` → parse `{"markdown":…}`).
fn build_markdown_transformer(
    snapshot: Option<std::sync::Arc<rpi_extensions::RegistrySnapshot>>,
) -> Option<MarkdownTransformer> {
    let snapshot = snapshot?;
    // Pre-check: if no markdown renderers are registered, return None so the
    // component uses the identity path (no per-delta closure call). The
    // renderers list is a per-call `renderers_of` clone; snapshotting it once
    // here keeps the closure cheap on the hot path.
    let renderers = snapshot.renderers_of(rpi_extensions::RegisteredRendererKind::Markdown);
    if renderers.is_empty() {
        return None;
    }
    Some(Arc::new(move |raw: &str| -> String {
        transform_markdown_chain(&snapshot, &renderers, raw)
    }))
}

/// Drive the markdown-transformer chain for one input string. Each registered
/// handler receives the previous handler's output (or the raw input for the
/// first), as a `{"markdown": <text>}` JSON envelope; its `RenderFn` returns
/// `{"markdown": <transformed>}` (rc=0) or an error (rc!=0). On any failure —
/// nonzero rc, a panic across the FFI (caught), a missing `markdown` field, or
/// an inactive snapshot — the chain short-circuits to the current text
/// unchanged (per-handler skip-on-error, mirroring pi's `runner.ts` fan-out).
fn transform_markdown_chain(
    snapshot: &rpi_extensions::RegistrySnapshot,
    renderers: &[rpi_extensions::RegisteredRenderer],
    raw: &str,
) -> String {
    // A stale snapshot (post-/reload) must not drive a swapped-out registry.
    // The renderers were captured from this snapshot; if it has gone inactive,
    // fall back to the raw input so the UI never renders stale-transformed text
    // from a dead plugin.
    if !snapshot.is_active() {
        return raw.to_string();
    }

    let mut current = raw.to_string();
    for renderer in renderers {
        let input = match serde_json::to_string(&serde_json::json!({ "markdown": current })) {
            Ok(s) => s,
            Err(_) => return current, // serialize failure — keep current, stop chain
        };
        // SAFETY: `render_fn` is a plugin-provided `extern "C" fn` over a
        // borrowed `StbStringRef` + an out-param. The plugin warrants
        // `poll`/`render` are non-blocking + thread-safe (the same contract
        // the tool adapter relies on). `user_data` is the plugin's opaque
        // pointer, stable for the registry lifetime (the keepalive keeps the
        // cdylib mapped). We reclaim `out` via the plugin's `free_string`
        // exactly once. The whole call is `catch_unwind`-wrapped — a plugin
        // panic must not unwind across the FFI boundary (same policy as the
        // tool partial cb + the runtime_action trampoline).
        let outcome = std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
            let mut out = rpi_plugin_sdk::StbString::empty();
            let rc = (renderer.render_fn)(
                rpi_plugin_sdk::StbStringRef::from_str(&input),
                &mut out as *mut rpi_plugin_sdk::StbString,
                renderer.user_data,
            );
            let text = if rc == 0 {
                let s = out.to_string_lossy();
                Some(s)
            } else {
                None
            };
            // Reclaim the plugin-owned `out` regardless of rc (rc!=0 may still
            // have written an error JSON the plugin allocated). `free_with` is
            // idempotent on an empty `StbString`.
            out.free_with(Some(renderer.plugin_free_string));
            text
        }));
        let out_text = match outcome {
            Ok(Some(s)) => s,
            Ok(None) => return current, // rc != 0 — skip this handler, keep current
            Err(_) => return current,   // panic — skip, keep current (do not abort: the
                                         // render path is not the action trampoline; a panicking transformer
                                         // degrades to identity rather than killing the process. Logged via
                                         // the `tracing` crate's panic hook.)
        };
        // Parse `{"markdown": <text>}`; lenient — a missing/non-string field
        // keeps the current text (skip this handler).
        let next = serde_json::from_str::<serde_json::Value>(&out_text)
            .ok()
            .and_then(|v| {
                v.get("markdown")
                    .and_then(|m| m.as_str())
                    .map(|s| s.to_string())
            })
            .unwrap_or(current);
        current = next;
    }
    current
}

// ===========================================================================
// Slash commands — trait + registry
// ===========================================================================
//
// Each built-in slash command is one `impl SlashCommand`. The commands are
// registered at startup into a [`CommandRegistry`] (one source of truth) that
// serves both dispatch ("given this token, run the command") and autocomplete
// ("list the visible commands"). This replaces the old two-list + sync-test
// arrangement, where `handle_slash_command` and `v1_slash_commands()` had to be
// kept in lock-step by hand.
//
// `execute` runs on the blocking key/compose thread (the editor `on_submit`
// callback and the Ctrl+L hotkey both land there), so it MUST stay synchronous:
//   - commands needing async (`set_model`/`set_thinking_level`/`set_active_tools`)
//     `tokio::spawn` the work and return immediately;
//   - commands needing the main async loop (`compact`/`copy`/`exit`/`clear`/
//     `user-input`) signal it via `ctx.tx.send(TuiMessage::…)`;
//   - everything else mutates the chat container + requests a render directly.

/// The borrowed world a slash command runs against. All fields are `Arc` (or a
/// cheap `String` snapshot), so one `CommandContext` clones freely into each
/// command without per-capture ceremony — this struct is exactly the set of
/// `*_for_cb` clones the old submit closure used to make individually.
#[derive(Clone)]
struct CommandContext {
    chat: Arc<Container>,
    tui: Arc<TuiAltScreen>,
    tx: mpsc::UnboundedSender<TuiMessage>,
    state: Arc<TuiState>,
    editor: Arc<Editor>,
    editor_container: Arc<Container>,
    lane: Arc<dyn AgentLane>,
    model_catalog: Arc<Vec<rpi_ai::Model>>,
    /// Lane model id snapshot, read once via `lane.get_model().await` BEFORE the
    /// blocking key loop starts. Selectors/key loop can't await, so they read
    /// this owned string instead. Semantically unchanged from pre-refactor.
    lane_model_id: String,
    cwd: std::path::PathBuf,
    /// Harness resources snapshot (skills + prompt templates) for `/context`.
    /// Captured once at TUI startup because the blocking submit thread can't
    /// `.await get_resources()`.
    resources: Arc<rpi_harness::types::AgentHarnessResources>,
    /// B5d: the reload context `/reload` drives. `Arc<ReloadContext>` so the
    /// blocking submit thread can cheaply clone it into the `ReloadCommand`
    /// without an `.await` (the command can't drive reload directly — it signals
    /// the main loop via `TuiMessage::ReloadExtensions`, which awaits the shared
    /// `reload_extension_resources` routine on the async runtime).
    reload_context: Arc<crate::session::ReloadContext>,
    /// The product-layer session (`AgentSession`). Commands that need durable
    /// reads, export, or usage stats go through this instead of reaching into
    /// the harness directly, so the product surface is one object.
    session: Arc<crate::agent_session::AgentSession>,
}

/// One slash command.
trait SlashCommand: Send + Sync {
    /// Canonical name, with the leading `/` (e.g. "/model").
    fn name(&self) -> &str;
    /// Aliases, also `/`-prefixed. Matched alongside `name()` during dispatch.
    /// Use [`SlashCommand::alias_visible`] to also surface an alias in the
    /// `/`-autocomplete list (most aliases stay hidden).
    fn aliases(&self) -> &'static [&'static str] {
        &[]
    }
    /// Whether the canonical name appears in the `/` autocomplete list. Hidden
    /// commands (`/context`, `/name`, …) return `false`.
    fn visible(&self) -> bool {
        true
    }
    /// Aliases that should also appear in the `/` autocomplete list. Defaults to
    /// none — most aliases (`/q`, `/m`, `/think`, `/resume`, `/v`) are kept off
    /// the list to keep it short. `/new` and `/quit` override this to surface.
    fn alias_visible(&self) -> &'static [&'static str] {
        &[]
    }
    /// Description shown in autocomplete and `/help`. A non-empty description is
    /// required to surface in autocomplete even when `visible()` is true.
    fn description(&self) -> &'static str {
        ""
    }
    fn description_owned(&self) -> String {
        self.description().to_string()
    }
    /// Execute the command. Only invoked for inputs starting with `/` whose
    /// first token matches `name()` or an alias. `args` is the whitespace-
    /// trimmed remainder after the command token ("" when none). Must stay
    /// synchronous (see the module-level note) — async work goes through
    /// `ctx.tx.send(TuiMessage::…)` or `tokio::spawn`.
    fn execute(&self, ctx: &CommandContext, args: &str);
}

/// Holds all registered slash commands; the single source of truth for both
/// dispatch and the autocomplete list.
struct CommandRegistry {
    commands: Vec<Arc<dyn SlashCommand>>,
}

impl CommandRegistry {
    fn new() -> Self {
        Self {
            commands: Vec::new(),
        }
    }

    fn register(&mut self, cmd: Arc<dyn SlashCommand>) {
        self.commands.push(cmd);
    }

    /// Find the command whose `name()` or an alias matches `token` (e.g. "/q").
    /// `token` is the first whitespace-delimited word of the input, `/`-prefixed.
    fn find(&self, token: &str) -> Option<&Arc<dyn SlashCommand>> {
        self.commands
            .iter()
            .find(|c| c.name() == token || c.aliases().contains(&token))
    }

    /// The autocomplete entries, derived from the registry so it can never drift
    /// from what dispatch recognizes. Surfaces the canonical name when
    /// `visible()` + non-empty description, plus any `alias_visible()` entries.
    /// Order = registration order; built-ins are registered before templates,
    /// so they win on a fuzzy tie (unchanged).
    fn visible_entries(&self) -> Vec<SlashCommandEntry> {
        let mut out: Vec<SlashCommandEntry> = Vec::new();
        for c in &self.commands {
            let description = c.description_owned();
            if c.visible() && !description.is_empty() {
                out.push(SlashCommandEntry {
                    name: c.name().into(),
                    description: description.clone(),
                });
            }
            // Surfaced aliases share the command's description.
            for alias in c.alias_visible() {
                out.push(SlashCommandEntry {
                    name: (*alias).into(),
                    description: description.clone(),
                });
            }
        }
        out
    }
}

/// Dispatch a ui_prompt_start event to extensions.
fn dispatch_ui_prompt_event(state: &TuiState) {
    use rpi_plugin_sdk::EventTag;

    if let Ok(session) = state.extension_session.lock() {
        if let Some(snapshot) = session.snapshot_arc() {
            rpi_extensions::dispatch_empty_event(&snapshot, EventTag::UiPromptStart);
        }
    }
}

/// Dispatch a ui_prompt_end event to extensions.
fn dispatch_ui_prompt_event_end(state: &TuiState) {
    use rpi_plugin_sdk::EventTag;

    if let Ok(session) = state.extension_session.lock() {
        if let Some(snapshot) = session.snapshot_arc() {
            rpi_extensions::dispatch_empty_event(&snapshot, EventTag::UiPromptEnd);
        }
    }
}

/// Canonical key name for a key event, matching the vocabulary
/// [`parse_configured_key`] accepts (`"space"`, `"enter"`, `"f1"`, `"a"`).
/// `None` for keys that cannot be named (media keys, unknown codes).
fn key_shortcut_name(code: KeyCode) -> Option<&'static str> {
    Some(match code {
        KeyCode::Char(' ') => "space",
        KeyCode::Enter => "enter",
        KeyCode::Esc => "escape",
        KeyCode::Tab => "tab",
        KeyCode::BackTab => "backtab",
        KeyCode::Backspace => "backspace",
        KeyCode::Delete => "delete",
        KeyCode::Up => "up",
        KeyCode::Down => "down",
        KeyCode::Left => "left",
        KeyCode::Right => "right",
        KeyCode::Home => "home",
        KeyCode::End => "end",
        KeyCode::PageUp => "pageup",
        KeyCode::PageDown => "pagedown",
        _ => return None,
    })
}

/// Lower-case name for a printable ASCII key (`a`, `1`, `,`), or `None` when the
/// key needs a dedicated name from [`key_shortcut_name`].
fn char_shortcut_name(ch: char) -> Option<String> {
    if ch.is_ascii_graphic() {
        Some(ch.to_ascii_lowercase().to_string())
    } else {
        None
    }
}

/// Route one key event to extension `Input` handlers when the key is claimed as
/// a shortcut. Returns `true` when the key was claimed (the caller must then
/// skip normal editor handling).
///
/// Only keys an extension explicitly claimed via `register_shortcut` are
/// routed, and only while the editor is empty, so a claimed key never steals
/// ordinary typing. Press **and** Release (and Repeat) are dispatched, which is
/// what lets a push-to-talk extension measure how long a key was held — the
/// normal editor path deliberately drops Release.
fn dispatch_key_event(state: &TuiState, key: &KeyEvent, editor: &Editor) -> bool {
    use rpi_plugin_sdk::EventTag;

    let name = key_shortcut_name(key.code)
        .map(str::to_string)
        .or_else(|| match key.code {
            KeyCode::Char(ch) => char_shortcut_name(ch),
            KeyCode::F(n) => Some(format!("f{n}")),
            _ => None,
        });
    let Some(name) = name else {
        return false;
    };

    let Ok(session) = state.extension_session.lock() else {
        return false;
    };
    let Some(snapshot) = session.snapshot_arc() else {
        return false;
    };
    // Nothing claimed this key (or nobody subscribes to Input) — not ours.
    if !snapshot.has_shortcut(&name) || snapshot.handlers_for(EventTag::Input).is_empty() {
        return false;
    }
    // Only claim the key while the editor is empty: with a draft in progress the
    // key belongs to typing (space especially).
    if !editor.get_text().is_empty() {
        return false;
    }

    let kind = match key.kind {
        KeyEventKind::Press => "press",
        KeyEventKind::Repeat => "repeat",
        KeyEventKind::Release => "release",
    };
    let payload = serde_json::json!({
        "type": "key",
        "key": name,
        "kind": kind,
        "ctrl": key.modifiers.contains(KeyModifiers::CONTROL),
        "alt": key.modifiers.contains(KeyModifiers::ALT),
        "shift": key.modifiers.contains(KeyModifiers::SHIFT),
    })
    .to_string();
    // The handler decides whether it actually wants the key: it returns the
    // `CLAIMED` code while its feature is active and `CONTINUE` otherwise, so a
    // registered-but-disabled shortcut (push-to-talk toggled off) still lets the
    // key reach the editor normally.
    rpi_extensions::dispatch_data_event_claiming(&snapshot, EventTag::Input, &payload)
}

/// Resolve a command for a `/`-prefixed input and run it when one matches.
///
/// Unknown slash-prefixed input is deliberately left for the normal prompt
/// path. In particular, the upstream skill-command behavior keeps an unknown
/// `/skill:name` intact so the model can still handle it; it must not be
/// converted into a local error before input handlers or the agent see it.
/// Returns `true` only when a registered slash command handled the input.
fn dispatch_slash(text: &str, ctx: &CommandContext, registry: &CommandRegistry) -> bool {
    let mut parts = text.split_whitespace();
    let token = parts.next().unwrap_or("");
    let args = parts.collect::<Vec<_>>().join(" ");
    match registry.find(token) {
        Some(cmd) => {
            cmd.execute(ctx, &args);
            true
        }
        None => false,
    }
}

/// Current wall-clock time in milliseconds since the Unix epoch. Used for
/// `bashExecution` message timestamps (agent-loop messages carry real times, so
/// the transcript record must too).
fn now_ms() -> i64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .map(|d| d.as_millis() as i64)
        .unwrap_or(0)
}

/// Parse a submitted line into a user shell command.
///
/// Mirrors upstream's `text.startsWith("!")` handling
/// (`interactive-mode.ts:3225`): `!cmd` runs and is recorded in the session
/// context, `!!cmd` is excluded from it. Returns `None` for a bare `!` / `!!`
/// (or whitespace only), so the line falls through to the normal prompt path.
fn parse_user_bash(text: &str) -> Option<(&str, bool)> {
    let rest = text.strip_prefix('!')?;
    let (command, exclude_from_context) = match rest.strip_prefix('!') {
        Some(command) => (command, true),
        None => (rest, false),
    };
    let command = command.trim();
    if command.is_empty() {
        return None;
    }
    Some((command, exclude_from_context))
}

/// Run a `!command` submitted from the editor.
///
/// The command executes out-of-band — it never reaches the model. Output
/// streams into a [`BashExecutionComponent`] in the transcript and the
/// terminal result is handed to the main loop, which persists it as a
/// `bashExecution` message (skipped from context for `!!`). Mirrors
/// `handleBashCommand` (`interactive-mode.ts:6729`).
fn start_user_bash(ctx: &CommandContext, command: &str, exclude_from_context: bool) {
    let comp = Arc::new(BashExecutionComponent::new_with_context(
        command,
        exclude_from_context,
    ));
    comp.set_expanded(*ctx.state.tool_outputs_expanded.lock().unwrap());
    ctx.chat.add_child(comp.clone());

    // Register the cancellation slot before spawning so an Esc arriving on the
    // key thread can never miss the run (upstream's `_bashAbortControllers`).
    let cancel = ctx.state.begin_user_bash();
    ctx.tui.request_render(false);

    let env: Arc<dyn rpi_tools::ExecutionEnv> =
        Arc::new(rpi_tools::OsExecutionEnv::with_cwd(ctx.cwd.clone()));
    let tui = ctx.tui.clone();
    let tx = ctx.tx.clone();
    let cwd = ctx.cwd.clone();
    let command_owned = command.to_string();

    tokio::spawn(async move {
        let comp_chunk = comp.clone();
        let tui_chunk = tui.clone();
        let on_chunk: Box<
            dyn FnMut(&str, &dyn Fn() -> rpi_tools::shell_output::ShellCaptureProgress) + Send,
        > = Box::new(move |_chunk, get_progress| {
            // The capture layer reports the complete tail captured so far, not
            // a delta; `append_output` replaces its snapshot accordingly.
            comp_chunk.append_output(&get_progress().output);
            tui_chunk.request_render(false);
        });
        let options = rpi_tools::shell_output::ShellCaptureOptions {
            cwd: Some(cwd),
            cancel: Some(&cancel),
            on_chunk: Some(on_chunk),
            return_execution_errors: true,
            ..Default::default()
        };
        let result =
            rpi_tools::shell_output::execute_shell_with_capture(&env, &command_owned, options)
                .await;

        // `Ok` carries the real exit code/cancellation; `Err` is a transport
        // level failure (spawn failure, invalid env) which we surface inline.
        let (exit_code, cancelled, output, truncated, full_output_path) = match result {
            Ok(capture) => (
                capture.exit_code,
                capture.cancelled,
                capture.output.clone(),
                capture.truncated,
                capture
                    .full_output_path
                    .as_ref()
                    .map(|path| path.to_string_lossy().into_owned()),
            ),
            Err(error) => (
                None,
                false,
                format!("Bash command failed: {error}"),
                false,
                None,
            ),
        };
        comp.append_output(&output);
        comp.set_complete(
            exit_code,
            cancelled,
            BashTruncation {
                truncated,
                full_output_path: full_output_path.clone(),
            },
        );
        tui.render_now(false);

        let _ = tx.send(TuiMessage::UserBashFinished(UserBashReport {
            command: command_owned,
            output,
            exit_code,
            cancelled,
            truncated,
            full_output_path,
            exclude_from_context,
        }));
    });
}

// ===========================================================================
// Channel + helpers
// ===========================================================================

/// Message type for communication between the key/callback threads and the
/// main async loop.
enum TuiMessage {
    UserInput(String),
    OpenTree,
    NavigateTree(String),
    Exit,
    /// Clear the transcript (from `/clear`).
    ClearChat,
    /// Compact the conversation (from `/compact`).
    Compact,
    /// Copy the last assistant reply to the clipboard (from `/copy`).
    Copy,
    /// Hot-switch to another saved session (from the `/session` selector):
    /// the payload is the session id the selector's item value carried.
    SwitchSession(String),
    /// Export the current session to a markdown file (from `/export`).
    ExportSession,
    /// Export session with specific format
    ExportSessionWithFormat(crate::export::ExportFormat),
    /// Show live usage/context stats (from `/usage` and `/context`).
    ShowUsage,
    /// Fork the current session into a new one and switch to it (from `/fork`).
    ForkSession,
    /// Rename the current session (from `/name <name>`).
    SetSessionName(String),
    /// Import a JSONL session file into the session dir and switch to it
    /// (from `/import <path>`).
    ImportSession(String),
    /// Share the current session (`/share`): `gh gist create` when the gh CLI
    /// is available, otherwise copy the transcript to the clipboard.
    ShareSession,
    /// `/reload` — re-run extension + resource discovery into the live harness
    /// (B5d). The command (and a plugin's `runtime_action(Reload)` via the
    /// mailbox) signal the main loop, which awaits
    /// `reload_extension_resources` on the async runtime.
    ReloadExtensions,
    /// Result returned after Ctrl+G edits a temporary file in an external
    /// editor. Handling it on the async loop keeps editor mutation single-
    /// threaded with the rest of the TUI state.
    ExternalEditorResult(Result<String, String>),
    /// A user-initiated `!command` / `!!command` shell run finished. Routed to
    /// the main loop so the `bashExecution` transcript record is persisted in
    /// order relative to agent runs (upstream's `recordBashResult` /
    /// `_pendingBashMessages`).
    UserBashFinished(UserBashReport),
}

/// Terminal result of a user-initiated `!command` shell run.
///
/// Carries everything needed to build the persisted `bashExecution` message
/// plus the `!!` context-exclusion flag. See `start_user_bash`.
struct UserBashReport {
    command: String,
    output: String,
    exit_code: Option<i32>,
    cancelled: bool,
    truncated: bool,
    full_output_path: Option<String>,
    exclude_from_context: bool,
}

/// Extract the concatenated text content from an assistant message (mirrors
/// the TS `contentText` projection — drops thinking/tool-call/image blocks).
fn assistant_text(msg: &AssistantMessage) -> String {
    msg.content
        .iter()
        .filter_map(|c| match c {
            Content::Text(t) => Some(t.text.clone()),
            _ => None,
        })
        .collect()
}

/// The user message's text (Text content or the text blocks of a Blocks
/// payload — images are skipped, consistent with the v1 text-only prompt path).
fn tool_result_message_text(msg: &rpi_ai::types::ToolResultMessage) -> String {
    msg.content
        .iter()
        .filter_map(|c| match c {
            Content::Text(t) => Some(t.text.clone()),
            _ => None,
        })
        .collect::<Vec<_>>()
        .join("\n")
}

fn user_message_text(msg: &rpi_ai::types::UserMessage) -> String {
    match &msg.content {
        rpi_ai::types::UserContent::Text(s) => s.clone(),
        rpi_ai::types::UserContent::Blocks(blocks) => blocks
            .iter()
            .filter_map(|c| match c {
                Content::Text(t) => Some(t.text.clone()),
                _ => None,
            })
            .collect(),
    }
}

/// The catalog allowed in the Ctrl+P cycle: the `/scoped-models` set from
/// settings.json when present, otherwise every model. The current model is
/// always included (fallback) so cycling can never strand the user off-scope.
// ===========================================================================
// interactive_tui — the entry point
// ===========================================================================

#[derive(Debug, PartialEq)]
struct TuiStartupSettings {
    editor_padding_x: usize,
    autocomplete_max_visible: usize,
    hide_thinking: bool,
    quiet_startup: bool,
    show_terminal_progress: bool,
    /// Render images inline (`terminal.showImages` / flat `showImages`).
    show_images: bool,
    /// Transcript notices for prompt-cache costs (`showCacheMissNotices`).
    cache_miss_notices: bool,
}

fn preferred_project_setting<T>(
    project_settings: &[crate::settings::Settings],
    field: impl Fn(&crate::settings::Settings) -> Option<T>,
) -> Option<T> {
    project_settings.iter().find_map(field)
}

fn should_show_startup_listing(verbose: bool, quiet_startup: bool) -> bool {
    verbose || !quiet_startup
}

/// `project_settings` is ordered by precedence; an explicit `Some`
/// wins even when the value is `false` or zero.
fn resolve_tui_startup_settings(
    global: &crate::settings::Settings,
    project_settings: &[crate::settings::Settings],
    project_trusted: bool,
) -> TuiStartupSettings {
    let project_settings = if project_trusted {
        project_settings
    } else {
        &[]
    };
    let editor_padding_x =
        preferred_project_setting(project_settings, |settings| settings.editor_padding_x)
            .or(global.editor_padding_x)
            .unwrap_or(1)
            .min(16);
    let autocomplete_max_visible = preferred_project_setting(project_settings, |settings| {
        settings.autocomplete_max_visible
    })
    .or(global.autocomplete_max_visible)
    .unwrap_or(5)
    .clamp(1, 20);
    let hide_thinking =
        preferred_project_setting(project_settings, |settings| settings.hide_thinking_block)
            .or(global.hide_thinking_block)
            .unwrap_or(false);
    let quiet_startup =
        preferred_project_setting(project_settings, |settings| settings.quiet_startup)
            .or(global.quiet_startup)
            .unwrap_or(false);
    let show_terminal_progress = preferred_project_setting(project_settings, |settings| {
        settings.show_terminal_progress()
    })
    .or_else(|| global.show_terminal_progress())
    .unwrap_or(true);
    let show_images =
        preferred_project_setting(project_settings, |settings| settings.show_images())
            .or_else(|| global.show_images())
            .unwrap_or(true);
    let cache_miss_notices = preferred_project_setting(project_settings, |settings| {
        settings.show_cache_miss_notices
    })
    .or(global.show_cache_miss_notices)
    .unwrap_or(false);

    TuiStartupSettings {
        editor_padding_x,
        autocomplete_max_visible,
        hide_thinking,
        quiet_startup,
        show_terminal_progress,
        show_images,
        cache_miss_notices,
    }
}

/// TUI-based interactive mode.
///
/// `event_rx` carries the live `AgentEvent` stream (installed by
/// [`crate::session::build`]); when `None` (e.g. a non-TUI caller reuses this
/// fn), it falls back to a blocking, await-final-text path.
///
/// `model_catalog` is the read-only catalog the `/model` selector displays.
///
/// This implementation mirrors the TypeScript `InteractiveMode` class:
/// build the layout root once, drain `AgentEvent`s into UI mutations that
/// mirror `handleEvent`, and dispatch keys from a `spawn_blocking` crossterm
/// loop (the `TuiAltScreen` start() handler is a stub). Selectors and
/// autocomplete are layered on via the editor-container swap pattern.
pub async fn interactive_tui(
    harness: &AgentHarness,
    event_rx: Option<broadcast::Receiver<AgentEvent>>,
    args: &Args,
    model_catalog: Vec<rpi_ai::Model>,
    initial: Option<String>,
    extra_messages: &[String],
    initial_images: Vec<rpi_ai::types::ImageContent>,
    theme: Option<&str>,
    _no_themes: bool,
    reload_context: &crate::session::ReloadContext,
) -> i32 {
    let lane: Arc<dyn AgentLane> = harness.lane("main");
    // Reuse the startup snapshot captured before provider/session setup. An
    // extension may mutate the process cwd while loading; that must not change
    // which project settings or package update roots this TUI observes.
    let cwd = reload_context.cwd.clone();
    let saved_settings = crate::settings::load_settings().unwrap_or_default();
    let project_trusted = reload_context.project_trusted;
    let project_settings = if project_trusted {
        crate::settings::load_project_settings(&cwd)
    } else {
        Vec::new()
    };
    let tui_settings =
        resolve_tui_startup_settings(&saved_settings, &project_settings, project_trusted);
    let editor_padding_x = tui_settings.editor_padding_x;
    let autocomplete_max_visible = tui_settings.autocomplete_max_visible;
    let mut hide_thinking = tui_settings.hide_thinking;
    let show_terminal_progress = tui_settings.show_terminal_progress;
    let show_images = tui_settings.show_images;
    let cache_miss_notices = tui_settings.cache_miss_notices;
    let quiet_startup = tui_settings.quiet_startup;
    // rpi only checks its own update channel.
    // Session display preferences (durable, latest-wins) override the
    // settings-file defaults. These are per-session facts stored as custom
    // entries (see `rpi_harness::session::values`), so resuming a session with
    // `-c`/`-r` restores the thinking/tool-output display the user last chose
    // there — independent of global settings. Absent keys leave the settings
    // value untouched.
    let session_values = rpi_harness::session::SessionValues::load(harness.session())
        .await
        .unwrap_or_default();
    if let Some(persisted) = session_values.get_as::<bool>("display.hide_thinking") {
        hide_thinking = persisted;
    }

    // Resolve the active model once, up front. The full id feeds the TuiState
    // tracking field + the selectors/key loop (which run on a blocking thread
    // and can't await `lane.get_model()`); the provider-qualified label feeds
    // the footer, matching Pi's `(provider) model` display.
    let lane_model = lane.get_model().await.ok();
    let lane_model_id = lane_model
        .as_ref()
        .map(|model| model.id.clone())
        .unwrap_or_default();
    let model_name = lane_model
        .as_ref()
        .map(|model| format!("({}) {}", model.provider, short_model_name(&model.id)))
        .unwrap_or_else(|| short_model_name(&lane_model_id));

    // Snapshot startup capabilities for the welcome screen. Both accessors
    // return defensive clones, so rendering this summary does not retain a
    // harness lock or trigger a second resource scan.
    let mut active_tool_names = lane.get_active_tools().await.unwrap_or_default();
    // AgentHarness uses an empty active-name list as the default "all tools"
    // state. Do not expose that implementation sentinel as `Tools (0) none`
    // in the welcome banner (it is especially visible on the first prompt).
    if active_tool_names.is_empty() {
        active_tool_names = harness
            .get_tools()
            .await
            .unwrap_or_default()
            .into_iter()
            .map(|tool| tool.tool.schema().name.clone())
            .collect();
    }
    let resources_snapshot = harness.get_resources().await.unwrap_or_default();
    let skill_names: Vec<String> = resources_snapshot
        .skills
        .as_deref()
        .unwrap_or(&[])
        .iter()
        .map(|skill| skill.name.clone())
        .collect();

    // Channel between the key/callback threads and the main async loop.
    let (tx, mut rx) = mpsc::unbounded_channel::<TuiMessage>();

    // Apply the saved theme before constructing transcript components. Some
    // components keep styled text, so doing this after the welcome banner left
    // the first screen in the dark palette until it was rebuilt.
    let theme_manager = Arc::new(ThemeManager::new());
    if let Some(preset) = match theme {
        Some("light") => Some(ThemePreset::Light),
        Some("monochrome") => Some(ThemePreset::Monochrome),
        Some("dark") => Some(ThemePreset::Dark),
        _ => None,
    } {
        apply_theme_preset(preset);
        theme_manager.apply_preset(preset);
    }

    // ---- TUI + containers ----
    let terminal = Box::new(ProcessTerminal::new());
    let tui = Arc::new(TuiAltScreen::new(terminal, true, None));
    // Plugin `ask_user` prompts (runtime action 17). Attaching marks this
    // session as interactive so a detached/headless host fails loudly instead
    // of returning a fabricated answer. The mailbox is session-scoped (held in
    // `ReloadContext`) so in-flight prompts survive a `/reload`.
    let ask_user_bridge = AskUserBridge::new(reload_context.ui_dialog.clone());
    ask_user_bridge.attach();
    tui.set_main_screen_mode(matches!(args.tui_mode, crate::args::TuiMode::Regular));

    let chat_container = Arc::new(Container::new());
    if should_show_startup_listing(args.verbose, quiet_startup) {
        add_welcome_message_with_capabilities(&chat_container, &active_tool_names, &skill_names);
    }

    // First-launch gate: if `~/.rpi/.setup_done` is absent, show the welcome
    // banner once, then write the sentinel. The banner covers the theme hint;
    // the theme stays pickable via `/theme`. See `extras.rs`.
    crate::extras::maybe_first_time_setup(&chat_container);

    // A --continue/--resume/--session launch opens on an existing JSONL
    // session — render its prior user/assistant transcript so the user sees
    // where they left off (tool executions are skipped: their live display
    // belongs to the current run, and replaying old results would be noise).
    let initial_transformer = build_markdown_transformer(
        reload_context
            .extension_session
            .lock()
            .unwrap()
            .snapshot_arc(),
    );
    // A normal launch creates a fresh session and must not replay records from
    // another/project harness. Only explicit restore/fork modes render prior
    // conversation history. This fixes stale prompts appearing every startup.
    if launch_restores_history(args) {
        render_session_history(
            &harness,
            &chat_container,
            initial_transformer.clone(),
            Some(reload_context.extension_session.clone()),
        )
        .await;
    }

    // `document_container` wraps the welcome header + chat so the scrollview
    // follows the whole transcript (mirrors TS `documentContainer`).
    let document_container = Arc::new(Container::new());
    document_container.add_child(chat_container.clone());
    // Add bottom padding to the output area for visual breathing room.
    document_container.add_child(Arc::new(Spacer::new(1)));

    let scroll_view = Arc::new(ScrollView::new(
        document_container.clone(),
        ScrollViewOptions {
            follow: FollowMode::End,
            primary: true,
            overscroll: OverscrollMode::Chain,
            // upstream keeps transcript chrome out of the way. Our Auto mode
            // has no hide timer yet and therefore became effectively permanent
            // after the first wheel event, unlike the upstream experience.
            scrollbar: ScrollbarMode::Hidden,
            ..Default::default()
        },
    ));

    // ---- Editor ----
    // Bordered box matching upstream: no `> ` prompt, no placeholder — the
    // editor renders full-width `─` top/bottom borders with padding-only lines
    // (see Editor::render). padding_x:1 gives a 1-col inset inside the box.
    let keybindings = configured_keybindings();
    let editor = Arc::new(Editor::new(
        EditorOptions {
            padding_x: editor_padding_x,
            autocomplete_max_visible,
            ..Default::default()
        },
        EditorStyle::default(),
        keybindings.clone(),
    ));

    // Bash-mode border: a `!`-prefixed draft recolors the editor border to the
    // bash accent (upstream's `updateEditorBorderColor` / `isBashMode`). The
    // editor fires `on_change` for keystrokes and for programmatic
    // `clear`/`set_text`, so the color also resets after a `!command` submits.
    {
        let editor_for_change = editor.clone();
        editor.on_change(Arc::new(move |text: &str| {
            let colors = current_theme().colors;
            let is_bash = text.trim_start().starts_with('!');
            editor_for_change.set_border_color(if is_bash {
                Some(colors.bash_mode)
            } else {
                None
            });
        }));
    }

    // ---- Footer + status ----
    let footer = Arc::new(FooterComponent::new());
    footer.set_model(&model_name);
    footer.set_cwd(&cwd.to_string_lossy());
    footer.set_git_branch(git_branch_for(&cwd).as_deref());
    if let Some(m) = model_catalog.iter().find(|m| m.id == lane_model_id) {
        footer.set_context_window(m.context_window as i64);
    }
    footer.set_hints("Enter: Send | Shift+Enter: New line | Ctrl+C: Clear/Exit | Esc: Abort | Ctrl+L: Model | Ctrl+P: Cycle | Ctrl+O: Expand tool | /help");

    // Live git-branch refresh (native fs-watch on `.git/HEAD`): a checkout or
    // commit updates the footer's branch without a manual refresh.
    let _branch_watcher = find_git_head_path(&cwd).map(|head| {
        let footer_ref = footer.clone();
        let cwd_ref = cwd.clone();
        crate::fs_watch::watch_path(head, move || {
            footer_ref.set_git_branch(git_branch_for(&cwd_ref).as_deref());
        })
    });

    let status_container = Arc::new(Container::new());
    let loader = Arc::new(Loader::with_text("Working…"));

    // ---- Autocomplete (slash commands + @file paths, rooted at cwd) ----
    // Prompt templates discovered at session build (Part A2) are surfaced as
    // `/`-prefixed entries alongside the built-in slash commands: typing
    // `/<name>` in the editor expands the template (mirrors pi
    // `expandPromptTemplate`, `agent-session.ts:1124`). The description carries
    // the template's frontmatter description (or a fallback) so the autocomplete
    // popover shows what each template does.
    //
    // We snapshot the full resources once (skills + prompt-templates): the
    // autocomplete builder consumes the templates, and the `/context` command
    // (fired from the blocking submit handler, which can't `.await`) reads the
    // snapshot to render the discovered-resources panel without touching the
    // harness async accessor.
    let template_slash_commands: Vec<SlashCommandEntry> = resources_snapshot
        .prompt_templates
        .clone()
        .unwrap_or_default()
        .iter()
        .map(|t| SlashCommandEntry {
            name: format!("/{}", t.name),
            description: t
                .description
                .clone()
                .unwrap_or_else(|| "Expand prompt template".to_string()),
        })
        .collect();
    let resources_arc: Arc<rpi_harness::types::AgentHarnessResources> =
        Arc::new(resources_snapshot);
    // Build the built-in command registry once — the single source of truth for
    // both dispatch and the built-in autocomplete entries. The discovered
    // prompt-template commands are merged into the autocomplete list separately
    // (they dispatch via template expansion, not the registry); built-ins come
    // first so they win on a fuzzy tie.
    let mut command_registry = build_builtin_registry();
    register_extension_commands(
        &mut command_registry,
        reload_context.extension_session.clone(),
    );
    let registry = Arc::new(command_registry);
    let mut all_slash_commands = registry.visible_entries();
    all_slash_commands.extend(template_slash_commands);
    let autocomplete = AutocompleteManager::new();
    {
        let mut combined = CombinedAutocompleteProvider::new();
        combined.add_provider(Arc::new(SlashCommandAutocompleteProvider::new(
            all_slash_commands,
        )));
        combined.add_provider(Arc::new(FilePathAutocompleteProvider::with_root(
            cwd.clone(),
        )));
        autocomplete.set_provider(Arc::new(combined));
    }
    let autocomplete_container = Arc::new(Container::new());

    let tool_outputs_expanded = session_values
        .get_as::<bool>("display.tool_outputs_expanded")
        .unwrap_or(false);
    let state = Arc::new(TuiState {
        current_assistant: Arc::new(std::sync::Mutex::new(None)),
        tool_components: Arc::new(std::sync::Mutex::new(HashMap::new())),
        bash_components: Arc::new(std::sync::Mutex::new(HashMap::new())),
        hide_thinking: Arc::new(std::sync::Mutex::new(hide_thinking)),
        tool_outputs_expanded: Arc::new(std::sync::Mutex::new(tool_outputs_expanded)),
        show_terminal_progress,
        status: std::sync::Mutex::new(RunStatus::Idle),
        ext_status: reload_context.ext_status.clone(),
        ext_status_revision: std::sync::atomic::AtomicU64::new(u64::MAX),
        editor_text: reload_context.editor_text.clone(),
        auto_send: std::sync::Mutex::new(None),
        last_editor_text: std::sync::Mutex::new(String::new()),
        programmatic_editor_write: std::sync::atomic::AtomicBool::new(false),
        js_preparation_cancel: std::sync::Mutex::new(None),
        user_bash_cancel: std::sync::Mutex::new(None),
        pending_bash_messages: std::sync::Mutex::new(Vec::new()),
        footer: footer.clone(),
        status_container: status_container.clone(),
        chat_container: chat_container.clone(),
        loader: loader.clone(),
        editor: editor.clone(),
        last_assistant_text: std::sync::Mutex::new(String::new()),
        active_selector: std::sync::Mutex::new(None),
        active_extension_editor: std::sync::Mutex::new(None),
        active_extension_input: std::sync::Mutex::new(None),
        active_extension_cancel: std::sync::Mutex::new(None),
        autocomplete,
        autocomplete_container: autocomplete_container.clone(),
        autocomplete_max_visible,
        pending_images: std::sync::Mutex::new(Vec::new()),
        theme_manager,
        tui: Some(tui.clone()),
        current_model_id: std::sync::Mutex::new(lane_model_id.clone()),
        show_images: std::sync::Mutex::new(show_images),
        cache_miss_notices: std::sync::Mutex::new(cache_miss_notices),
        history: std::sync::Mutex::new(Vec::new()),
        history_index: std::sync::Mutex::new(-1),
        history_draft: std::sync::Mutex::new(None),
        cache_tracker: std::sync::Mutex::new(rpi_harness::cache_stats::CacheMissTracker::new()),
        scoped_edit: std::sync::Mutex::new(None),
        markdown_transformer: Arc::new(std::sync::Mutex::new(initial_transformer)),
        extension_session: reload_context.extension_session.clone(),
        search: Arc::new(AltScreenSearch::new()),
        search_bar: Arc::new(SearchBar::new()),
        pending_container: Arc::new(Container::new()),
        dequeue_hint: pending_dequeue_hint(&keybindings),
        pending_snapshot: std::sync::Mutex::new(
            rpi_harness::agent_harness::QueuedMessages::default(),
        ),
        selection_start: std::sync::Mutex::new(None),
        selection_end: std::sync::Mutex::new(None),
    });

    let _compaction_watcher = harness.watch({
        let state = Arc::clone(&state);
        let tui = Arc::clone(&tui);
        move |event| {
            if let rpi_harness::events::HarnessEvent::CompactionProgress(event) = event {
                if event.lane != "main" {
                    return;
                }
                if event.active {
                    if state.show_terminal_progress {
                        state.editor.set_working(Some(WorkingState {
                            frame: 0,
                            started_at: std::time::Instant::now(),
                            message: if event.manual {
                                "Compacting context… (Esc to cancel)"
                            } else {
                                "Auto-compacting… (Esc to cancel)"
                            }
                            .into(),
                        }));
                    }
                } else {
                    let status = *state.status.lock().unwrap();
                    state.apply_status(status);
                }
                tui.request_render(false);
            }
        }
    });

    // Capture the model catalog + cwd for the selector builders + the key loop
    // (the callbacks fire on blocking threads and need owned data).
    let model_catalog_arc = Arc::new(model_catalog.clone());
    let lane_model_id = lane.get_model().await.map(|m| m.id).unwrap_or_default();

    // ---- Layout root (built ONCE; mirrors TS fullscreenLayoutRoot) ----
    // root = VStack[ scrollview(basis:0 grow:1 shrink:1 min:1), dock(shrink:1) ]
    // dock  = VStack[ status(auto), autocomplete(auto), editor_container(shrink:0 min:3), footer(auto) ]
    //
    // The scrollview gets `basis(0)` so the constrained stack allocator starts
    // it at zero height and grows it to fill the space the dock does not need
    // — this keeps the dock (editor borders + footer) pinned to the bottom and
    // never shrinks it below the editor's 3 rows (top + content + bottom). The
    // editor_container is `shrink(0).min_size(3)` so a tall transcript can
    // never clip the input panel below its minimum.
    let editor_container = Arc::new(Container::new());
    editor_container.add_child(editor.clone());

    let dock = Arc::new(VStack::from_children(vec![
        StackChild::Entry(StackEntry::new(state.pending_container().clone())),
        StackChild::Entry(StackEntry::new(status_container.clone())),
        StackChild::Entry(StackEntry::new(autocomplete_container.clone())),
        // NOTE: no Spacer here. The scroll content already ends with a blank line
        // (`document_container`), and a second one in the dock stacked into a
        // two-row gap between the last message and the input box. One row of
        // breathing room is the whole safe area now; the transcript keeps its
        // own padding so a long message never touches the editor border.
        StackChild::Entry(
            StackEntry::new(editor_container.clone())
                .shrink(0)
                .min_size(3),
        ),
        StackChild::Entry(StackEntry::new(state.search_bar.clone())),
        StackChild::Entry(StackEntry::new(footer.clone())),
    ]));

    let root = VStack::from_children(vec![
        StackChild::Entry(
            StackEntry::new(scroll_view.clone())
                .basis(0)
                .grow(1)
                .shrink(1)
                .min_size(1),
        ),
        StackChild::Entry(StackEntry::new(dock).shrink(1)),
    ]);

    tui.set_layout_root(Some(Arc::new(root)));
    tui.set_focus(Some(editor.clone()));
    editor.set_focused(true);

    // ---- Submit handler (fires on the blocking key thread; must stay sync) ----
    //
    // The handler captures one `CommandContext` (the set of `*_for_cb` clones
    // the old version made individually) + the registry, then routes `/`-text
    // through `dispatch_slash` and sends plain text directly. Each command's
    // `execute` owns its own effects (selector open, `tx.send`, `tokio::spawn`,
    // chat mutation) — the handler itself stays a thin router.
    //
    // One `CommandContext` is built and cloned for both the submit handler and
    // the key loop (Ctrl+L routes `/model` through the same registry); all
    // fields are `Arc`/cheap, so the clones are free.
    //
    // The product-layer `AgentSession` wraps a clone of the harness (the
    // harness handle is cheap and shares the session/bus), so `/usage`,
    // `/export`, and future product commands go through one surface.
    let scoped_models = args
        .model
        .as_deref()
        .map(crate::agent_session::ScopedModel::parse)
        .into_iter()
        .collect();
    let agent_session = Arc::new(crate::agent_session::AgentSession::new(
        harness.clone(),
        model_catalog.clone(),
        scoped_models,
        cwd.clone(),
    ));
    let ctx = CommandContext {
        chat: chat_container.clone(),
        tui: tui.clone(),
        tx: tx.clone(),
        state: state.clone(),
        editor: editor.clone(),
        editor_container: editor_container.clone(),
        lane: lane.clone(),
        model_catalog: model_catalog_arc.clone(),
        lane_model_id: lane_model_id.clone(),
        cwd: cwd.clone(),
        resources: resources_arc.clone(),
        reload_context: Arc::new(reload_context.clone()),
        session: agent_session.clone(),
    };

    let ctx_for_cb = ctx.clone();
    let registry_for_cb = registry.clone();
    editor.on_submit(Arc::new(move |text: &str| {
        let text = text.trim();
        if text.is_empty() {
            return;
        }

        if text.starts_with('/') && dispatch_slash(text, &ctx_for_cb, &registry_for_cb) {
            return;
        }

        // User-initiated shell mode: `!command` runs in the background and is
        // recorded in the session context; `!!command` is excluded from it.
        // Handled before the agent prompt path so it never reaches the model.
        // Mirrors `interactive-mode.ts:3225`.
        if let Some((command, exclude_from_context)) = parse_user_bash(text) {
            if ctx_for_cb.state.user_bash_running() {
                add_error_message(
                    &ctx_for_cb.chat,
                    "A bash command is already running. Press Esc to cancel it first.",
                );
                ctx_for_cb.tui.request_render(false);
                return;
            }
            start_user_bash(&ctx_for_cb, command, exclude_from_context);
            return;
        }

        let run_status = *ctx_for_cb.state.status.lock().unwrap();
        if run_status != RunStatus::Idle {
            let message = AgentMessage::User(UserMessage::new(text.to_string(), 0));
            let lane = ctx_for_cb.lane.clone();
            let chat = ctx_for_cb.chat.clone();
            let tui = ctx_for_cb.tui.clone();
            let state = ctx_for_cb.state.clone();
            tokio::spawn(async move {
                // Queue immediately while the agent loop is still running.
                // Routing this through the TUI's main channel delayed it until
                // `prompt_text()` returned, after the loop's drain points had
                // passed, so the queued message appeared to disappear.
                //
                // upstream's `steer()` enqueues unconditionally, even after
                // the run ends, and the message stays in the queue for the
                // next run. This matches the TS design and avoids the race
                // between `activeRun` clearing and the status check.
                if let Err(error) = lane.steer(message).await {
                    add_error_message(&chat, &format!("Could not queue message: {error}"));
                    tui.render_now(false);
                    return;
                }
                // Surface the queued entry in the pending dock immediately;
                // the drain-time refresh only fires on the next agent event.
                refresh_pending_messages(&state, &lane).await;
                tui.request_render(false);
            });
            // A queued prompt is echoed only once the loop actually consumes
            // it: the run's `AgentEvent::MessageStart` renders the user bubble
            // (upstream renders `message_start` for user messages). Until
            // then it is surfaced by the pending-messages display, so the
            // transcript never shows a message that is still waiting.
            ctx_for_cb.tui.request_render(false);
            return;
        }

        if !ctx_for_cb.state.try_start_working() {
            return;
        }

        // Render the user bubble here, NOT from `AgentEvent::MessageStart`.
        //
        // The harness persists the prompt itself and then drives
        // `run_agent_loop` with an EMPTY prompts vec (so the prompt is not
        // double-counted in the provider context), which means the loop emits
        // no `message_start` for it — see
        // `directly_sent_prompt_emits_no_user_message_start` in
        // `crates/rpi-harness/tests/harness_run_e2e.rs`. Queued steering /
        // follow-up prompts DO get a `message_start` (the loop drains those
        // itself), so those are deliberately rendered from the event instead.
        add_user_message(&ctx_for_cb.chat, text);
        // A new prompt starts a fresh interaction at the tail even when the
        // user had scrolled up to inspect older output.
        if let Some(scroll) = ctx_for_cb.tui.get_primary_scroll_view() {
            scroll.scroll_to_end();
        }
        ctx_for_cb.tui.request_render(false);
        // Remember the message for ↑ recall (slash commands are not part of
        // the replayable message history).
        push_history(&ctx_for_cb.state, text);
        if ctx_for_cb
            .tx
            .send(TuiMessage::UserInput(text.to_string()))
            .is_err()
        {
            ctx_for_cb.state.set_status(RunStatus::Idle);
        }
    }));

    // Turn on the native-pi frame throttle before the first frame: from here on
    // `request_render(false)` parks a frame and the scheduler thread paints at
    // most one per `MIN_RENDER_INTERVAL_MS` (16 ms). A provider that streams one
    // `MessageUpdate` per delta would otherwise force a full transcript
    // re-render + full-viewport terminal write per token, which is what made
    // long output saturate the terminal (and its GPU compositor). Immediate
    // renders (selectors, the first frame, `render_now(..)`) are unaffected.
    tui.start_render_scheduler();
    tui.start_readerless();

    // Consume local self-update results even when network checks are disabled.
    // Keep package discovery separate so package managers and Git remotes
    // cannot delay an rpi update notice or a prior helper failure.
    let mut update_check_handles = Vec::new();
    let rpi_chat = chat_container.clone();
    let rpi_tui = tui.clone();
    update_check_handles.push(tokio::spawn(async move {
        let report = crate::updates::check_rpi_startup().await;
        if !report.is_empty() {
            add_update_notices(&rpi_chat, &report);
        }
        rpi_tui.request_render(false);
    }));

    // Only the rpi self-update check runs.

    // ---- Streaming drain task ----
    let drain_handle = if let Some(rx) = event_rx {
        let tui_drain = tui.clone();
        let state_drain = state.clone();
        let chat_drain = chat_container.clone();
        let lane_drain = lane.clone();
        Some(tokio::spawn(async move {
            drain_agent_events(rx, tui_drain, state_drain, chat_drain, lane_drain).await;
        }))
    } else {
        None
    };

    // ---- B5d: plugin→TUI reload bridge ----
    // A plugin's `runtime_action(Reload)` can't drive the reload synchronously
    // (its cdylib would be unmapped while the call frame is still on the stack).
    // Instead the `ActionBridge`'s reload callback signals `reload_context.mailbox`
    // (an `UnboundedSender<()>`); this task drains those signals and forwards
    // `TuiMessage::ReloadExtensions` into the main loop, which runs the shared
    // `reload_extension_resources` routine asynchronously. The mailbox is the
    // cycle-free seam: rpi-extensions carries only `()` (no `TuiMessage` type —
    // leaf DAG preserved); the TUI owns the receiver + the reload routine.
    let (reload_sig_tx, mut reload_sig_rx) = tokio::sync::mpsc::unbounded_channel::<()>();
    reload_context.mailbox.install(reload_sig_tx);
    let reload_tx = tx.clone();
    let reload_bridge_handle = tokio::spawn(async move {
        while reload_sig_rx.recv().await.is_some() {
            if reload_tx.send(TuiMessage::ReloadExtensions).is_err() {
                break; // main loop gone — stop forwarding
            }
        }
    });

    // ---- Render-tick task (advances the loader spinner while Working) ----
    //
    // The `Loader` only advances its frame on render; without a periodic
    // `request_render` the spinner visibly freezes between events.
    let tui_tick = tui.clone();
    let state_tick = state.clone();
    // The tick, not the key loop, drives the voice-draft auto-send: it must
    // fire even when the user types nothing.
    let tx_tick = tx.clone();
    let tick_handle = tokio::spawn(async move {
        // 80ms per frame — upstream's `DEFAULT_INTERVAL_MS`, i.e. a full
        // 10-frame cycle every 800ms. The tick only *requests a repaint*; the
        // frame is advanced by `Editor::render` (mirroring `Loader::render`),
        // so streaming output — which schedules a frame per token — spins it
        // faster, and this interval is the floor when the model is silent.
        //
        // Advancing here as well would double-step every tick and make the idle
        // spinner run at 40ms/frame, twice upstream's rate.
        let mut interval = tokio::time::interval(std::time::Duration::from_millis(
            rpi_tui::loader::SPINNER_FRAME_MS,
        ));
        interval.tick().await; // discard immediate
        loop {
            interval.tick().await;
            // Extension status (langfuse ✓ …, …) — cheap revision check, and the
            // only reason an idle session repaints its footer.
            if state_tick.sync_extension_status() {
                tui_tick.request_render(false);
            }
            // Extension editor-text injection (`SetEditorText`): a voice plugin
            // drops a transcription in as an editable draft.
            if state_tick.drain_editor_text() {
                tui_tick.request_render(false);
            }
            // Tell extensions the draft changed (voice barge-in). Runs after the
            // drain so an injected transcription also counts as a change.
            state_tick.sync_editor_change();
            // Advance a draft's auto-send countdown (submit / cancel / repaint).
            if poll_auto_send(&state_tick, &tx_tick) {
                tui_tick.request_render(false);
            }
            let working = *state_tick.status.lock().unwrap() == RunStatus::Working;
            if working {
                // A live transcript panel — a running bash command *or* a
                // running tool call — computes its elapsed readout from
                // `Instant::now()` at render time. A frame that reuses the
                // cached scroll content never rebuilds it, so the readout
                // froze at the second of the last full rebuild (reported: a
                // `search` call stuck at "2.0s" with no way to tell it was
                // still running). Rebuild while any such panel is live.
                let bash_present = !state_tick.bash_components.lock().unwrap().is_empty();
                let has_live_panel = {
                    let tools = state_tick.tool_components.lock().unwrap();
                    transcript_has_live_panel(bash_present, &tools)
                };
                if has_live_panel {
                    tui_tick.request_render(false);
                } else {
                    // Only the dock loader animates. Keep the already-rendered
                    // transcript instead of rebuilding a long history at 12.5
                    // frames per second.
                    tui_tick.request_render_reusing_scroll_content();
                }
            }
        }
    });

    // ---- Key dispatch loop (spawn_blocking crossterm read) ----
    let running = Arc::new(std::sync::Mutex::new(true));
    let running_key = running.clone();
    let tx_for_key = tx.clone();
    let tui_for_key = tui.clone();
    let editor_for_key = editor.clone();
    let scroll_for_key = scroll_view.clone();
    let lane_for_key = lane.clone();
    let state_for_key = state.clone();
    let model_catalog_for_key = model_catalog_arc.clone();
    let ask_user_for_key = ask_user_bridge.clone();
    // Ctrl+L routes through the same registry as `/model` (one path, not two),
    // so the key loop needs the same `CommandContext` + registry the submit
    // handler uses. All fields are `Arc`/cheap, so this clone is free.
    let ctx_for_key = ctx.clone();
    let registry_for_key = registry.clone();
    let keybindings_for_key = keybindings.clone();
    let double_escape_action = crate::settings::load_settings()
        .ok()
        .and_then(|settings| settings.double_escape_action)
        .unwrap_or_else(|| "tree".to_string())
        .to_ascii_lowercase();

    let key_handle = tokio::task::spawn_blocking(move || {
        let mut last_escape_time = None;
        // upstream's `handleCtrlC` "press twice to exit" window: the instant of
        // the last lone Ctrl+C. Shares the 500ms with Esc's double-escape.
        let mut last_sigint_time: Option<std::time::Instant> = None;
        // One event peeked at by the paste-burst probe (which must discard a
        // key's Release but never lose a meaningful event it read). Restored
        // at the top of the next loop iteration.
        let mut pending_event: Option<Event> = None;
        let mut windows_paste_run = WindowsPasteRun::default();
        if crate::key_trace::enabled() {
            crate::key_trace::note(&format!(
                "--- rpi TUI key trace start pid={} TERM={} raw_mode={} ---",
                std::process::id(),
                std::env::var("TERM").unwrap_or_else(|_| "(unset)".to_string()),
                crossterm::terminal::is_raw_mode_enabled().unwrap_or(false),
            ));
        }
        loop {
            if !*running_key.lock().unwrap() {
                break;
            }
            if !state_for_key.selector_open() && !state_for_key.extension_dialog_open() {
                if let Some(request) = ask_user_for_key.take_pending() {
                    open_ask_user_dialog(&ctx_for_key, ask_user_for_key.clone(), request);
                }
            }
            let ev = if let Some(ev) = pending_event.take() {
                ev
            } else {
                // `event::read()` blocks indefinitely. Poll first so shutdown can
                // stop and join this worker even when no further key arrives.
                match crossterm::event::poll(
                    if cfg!(windows) && !windows_paste_run.text.is_empty() {
                        windows_paste_run.grace()
                    } else {
                        std::time::Duration::from_millis(50)
                    },
                ) {
                    Ok(true) => {}
                    Ok(false) => {
                        if cfg!(windows) && !windows_paste_run.text.is_empty() {
                            windows_paste_run.flush(&editor_for_key);
                            refresh_autocomplete(&state_for_key, &editor_for_key);
                            tui_for_key.request_render_reusing_scroll_content();
                        }
                        continue;
                    }
                    Err(_) => {
                        state_for_key.cancel_js_preparation();
                        let _ = tx_for_key.send(TuiMessage::Exit);
                        break;
                    }
                }
                let Ok(ev) = crossterm::event::read() else {
                    state_for_key.cancel_js_preparation();
                    let _ = tx_for_key.send(TuiMessage::Exit);
                    break;
                };
                ev
            };
            // `Event::Resize` is delivered as its own event (not a Key). With
            // `start_readerless` there is no competing terminal-reader thread to
            // handle it, so refresh the cached terminal size here and force a
            // full redraw so the constrained layout re-fits the new dimensions.
            if let Event::Resize(_cols, _rows) = ev {
                tui_for_key.refresh_size();
                continue;
            }
            // Mouse wheel scrolls the transcript (pi supports wheel
            // scrolling). Previously every non-Key event was dropped, so a
            // wheel had zero effect
            if let Event::Mouse(m) = ev {
                use crossterm::event::MouseEventKind;
                match m.kind {
                    MouseEventKind::ScrollUp => {
                        let delta = -MOUSE_WHEEL_SCROLL_LINES;
                        if scroll_for_key.scroll_by(delta) != delta {
                            tui_for_key.request_render_reusing_scroll_content();
                        }
                    }
                    MouseEventKind::ScrollDown => {
                        let delta = MOUSE_WHEEL_SCROLL_LINES;
                        if scroll_for_key.scroll_by(delta) != delta {
                            tui_for_key.request_render_reusing_scroll_content();
                        }
                    }
                    MouseEventKind::Down(crossterm::event::MouseButton::Right) if cfg!(windows) => {
                        // upstream treats Windows right-click as a clipboard
                        // paste, rather than letting the console deliver the
                        // clipboard contents as individual key events. This is
                        // what preserves the complete payload for
                        // Editor::handle_paste and large-paste folding.
                        if let Some(text) = read_clipboard_text() {
                            if !text.is_empty() {
                                editor_for_key.handle_paste(&text);
                                refresh_autocomplete(&state_for_key, &editor_for_key);
                                tui_for_key.request_render_reusing_scroll_content();
                            }
                        }
                    }
                    MouseEventKind::Down(crossterm::event::MouseButton::Left) => {
                        // Start selection tracking. `selection_end` doubles as the
                        // "a real drag happened" marker: a plain tap never sets
                        // it, so it can never overwrite the clipboard.
                        *state_for_key.selection_start.lock().unwrap() = Some((m.column, m.row));
                        *state_for_key.selection_end.lock().unwrap() = None;
                    }
                    MouseEventKind::Drag(crossterm::event::MouseButton::Left) => {
                        // Motion with the button held = a genuine selection drag.
                        // (Terminals only report this with button-event mouse
                        // tracking, which `ProcessTerminal` enables.)
                        if state_for_key.selection_start.lock().unwrap().is_some() {
                            *state_for_key.selection_end.lock().unwrap() = Some((m.column, m.row));
                        }
                    }
                    MouseEventKind::Up(crossterm::event::MouseButton::Left) => {
                        // End selection and auto-copy if enabled
                        if let Some(start) = *state_for_key.selection_start.lock().unwrap() {
                            let end = (m.column, m.row);

                            // Only auto-copy when the pointer actually MOVED with
                            // the button held (`Drag` set `selection_end`). A plain
                            // click/tap — even one whose Down/Up cells differ by a
                            // pixel over RDP — must not touch the clipboard: it used
                            // to fire `extract_selected_text`, which copies whatever
                            // rendered TUI line sat under the pointer, silently
                            // clobbering the user's real clipboard so the next paste
                            // returned that stale text.
                            let is_drag = state_for_key.selection_end.lock().unwrap().is_some();
                            *state_for_key.selection_end.lock().unwrap() = Some(end);

                            // Check if auto-copy is enabled
                            let auto_copy = crate::settings::load_settings()
                                .ok()
                                .and_then(|s| s.fullscreen_copy_on_select)
                                .unwrap_or(true);

                            if auto_copy && is_drag {
                                // Try to extract selected text from chat container
                                if let Some(selected_text) =
                                    extract_selected_text(&state_for_key.chat_container, start, end)
                                {
                                    if !selected_text.trim().is_empty() {
                                        let _ = copy_to_clipboard(&selected_text);
                                    }
                                }
                            }
                        }
                        *state_for_key.selection_start.lock().unwrap() = None;
                        *state_for_key.selection_end.lock().unwrap() = None;
                    }
                    _ => {}
                }
                continue;
            }
            let Event::Key(key) = ev else {
                if let Event::Paste(text) = ev {
                    crate::key_trace::note(&format!(
                        "paste event ({} bytes, bracketed paste supported)",
                        text.len()
                    ));
                    let candidate = text.trim().trim_matches(['\"', '\'']);
                    let path = std::path::PathBuf::from(candidate);
                    if !candidate.chars().any(|c| c == '\n' || c == '\r') && path.is_file() {
                        if let Ok(Some(image)) = crate::app::image_content_from_path(&path) {
                            add_image_preview(&state_for_key.chat_container, &image);
                            state_for_key.queue_image(image);
                            add_note_message(
                                &state_for_key.chat_container,
                                "Dropped image attached to the next prompt.",
                            );
                            tui_for_key.request_render(false);
                            continue;
                        }
                    }
                    editor_for_key.handle_paste(&text);
                    refresh_autocomplete(&state_for_key, &editor_for_key);
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            };
            // Diagnostic trace (off unless RPI_DEBUG_KEYS is set): records what
            // actually arrived before any routing decision, so a client that
            // sends LF for Enter is visible as `Char('j') mods=CONTROL`.
            crate::key_trace::key(&key, "");
            // A key press during a voice-draft auto-send countdown cancels the
            // countdown — the user wants to edit, not send. The key still falls
            // through to the editor, so it doubles as their first correction.
            if key.kind != KeyEventKind::Release && state_for_key.cancel_auto_send_on_key() {
                tui_for_key.request_render(false);
            }
            // Extension shortcuts see Press *and* Release (this is what lets a
            // push-to-talk extension time a hold). Checked before the
            // release-drop below; a claimed key with an empty editor is routed
            // to the plugin's `Input` handler instead of the editor.
            if dispatch_key_event(&state_for_key, &key, &editor_for_key) {
                continue;
            }
            // Drop releases but preserve Repeat so holding arrows, Backspace,
            // PageUp, etc. behaves naturally. Windows emits Press + Release
            // for a tap; terminals with keyboard enhancement may additionally
            // emit Repeat while a key is held.
            if !should_dispatch_key(key.kind) {
                continue;
            }

            // Prompt preparation runs on a blocking worker before the agent
            // lane owns the turn. Cancel it directly: an abort queued only to
            // the lane cannot wake a JS factory or lifecycle hook that never
            // resolves. This check precedes custom/dialog routing because
            // those components may themselves have been opened by the hook.
            let prompt_abort = (key.modifiers == KeyModifiers::CONTROL
                && matches!(key.code, KeyCode::Char('c') | KeyCode::Char('d')))
                || (key.modifiers == KeyModifiers::NONE && key.code == KeyCode::Esc);
            if prompt_abort && state_for_key.cancel_js_preparation() {
                state_for_key.set_status(RunStatus::Aborting);
                if !run_extension_cancel(&state_for_key) && state_for_key.extension_dialog_open() {
                    close_extension_editor(
                        &state_for_key,
                        &ctx_for_key.editor_container,
                        &editor_for_key,
                        &tui_for_key,
                    );
                }
                tui_for_key.set_render_suspended(false);
                tui_for_key.request_render(false);
                continue;
            }

            // Ctrl+C cancels an open selector before it reaches the global
            // abort/exit handler. Route through Esc so selector callbacks run.
            if key.modifiers == KeyModifiers::CONTROL
                && key.code == KeyCode::Char('c')
                && state_for_key.selector_open()
            {
                let selector = state_for_key
                    .active_selector
                    .lock()
                    .unwrap()
                    .clone()
                    .expect("selector_open guaranteed Some")
                    .0;
                selector.handle_key(KeyEvent::new(KeyCode::Esc, KeyModifiers::NONE));
                tui_for_key.request_render_reusing_scroll_content();
                continue;
            }

            // Extension dialogs own the input slot while awaiting a result.
            // Esc and Ctrl+C both resolve the pending command with cancel;
            // all other keys go to the active native editor/input widget.
            if state_for_key.extension_dialog_open() {
                let cancel = key.code == KeyCode::Esc
                    || (key.modifiers == KeyModifiers::CONTROL && key.code == KeyCode::Char('c'));
                if cancel {
                    if !run_extension_cancel(&state_for_key) {
                        close_extension_editor(
                            &state_for_key,
                            &ctx_for_key.editor_container,
                            &editor_for_key,
                            &tui_for_key,
                        );
                    }
                } else if let Some(extension_editor) = state_for_key
                    .active_extension_editor
                    .lock()
                    .unwrap()
                    .clone()
                {
                    extension_editor.handle_key(key);
                } else if let Some(extension_input) =
                    state_for_key.active_extension_input.lock().unwrap().clone()
                {
                    extension_input.handle_key(key);
                }
                tui_for_key.request_render_reusing_scroll_content();
                continue;
            }

            // 0. Ctrl+C: upstream's `handleCtrlC`. A second press inside the
            //    double-press window quits; any other press only clears the
            //    editor (text *and* selection — native `clearEditor`). It never
            //    aborts — `app.interrupt` (Esc) owns cancelling a run — so a
            //    stray Ctrl+C while streaming can no longer kill the turn.
            //    Open selectors and extension dialogs are handled above so
            //    their cancellation callbacks get first chance.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::CLEAR,
            ) {
                // A held key auto-repeats: only a fresh Press may arm or
                // consume the window, so holding Ctrl+C cannot turn one tap
                // into the quit.
                if key.kind != KeyEventKind::Repeat {
                    let now = std::time::Instant::now();
                    match ctrl_c_action(last_sigint_time, now) {
                        CtrlCAction::Exit => {
                            last_sigint_time = None;
                            // The async loop parks inside
                            // `run_prompt_streaming(..).await` for the whole run,
                            // so a queued `Exit` would not be read until the run
                            // returns — force the quit while one is active. Either
                            // way the TUI stays quittable.
                            if *state_for_key.status.lock().unwrap() == RunStatus::Idle {
                                let _ = tx_for_key.send(TuiMessage::Exit);
                            } else {
                                emergency_exit(&tui_for_key);
                            }
                        }
                        CtrlCAction::Clear => {
                            editor_for_key.clear();
                            refresh_autocomplete(&state_for_key, &editor_for_key);
                            last_sigint_time = Some(now);
                            tui_for_key.request_render(false);
                        }
                    }
                }
                continue;
            }

            // 0b. Ctrl+X: upstream's `app.message.copy` — copy the editor
            //     selection, else the last assistant reply. Native's Ctrl+C no
            //     longer copies, so selection-copy lives here now.
            if !state_for_key.selector_open()
                && keybinding_matches(
                    &keybindings_for_key,
                    &key,
                    rpi_tui::keybindings::keys::MESSAGE_COPY,
                )
            {
                if editor_for_key.has_selection() && editor_for_key.copy_selection() {
                    add_note_message(&state_for_key.chat_container, "Copied!");
                } else {
                    copy_last_assistant(&state_for_key, &state_for_key.chat_container);
                }
                tui_for_key.request_render(false);
                continue;
            }

            // 0c. Ctrl+Z (Unix only): upstream's `app.suspend` — hand the
            //     terminal back to the shell and stop ourselves; `SIGTSTP`
            //     returns when the user resumes with `fg`. Windows binds no key
            //     here (native's `defaultKeys` is empty), so this never fires.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::SUSPEND,
            ) {
                handle_suspend(&tui_for_key);
                continue;
            }

            // 1. A selector overlay is open → route to it first. Only Esc
            //    (cancel) and Enter/Up/Down/Ctrl-K/J/P/N (navigate/select)
            //    escape to the selector; on done/cancel the selector callbacks
            //    restore the editor and clear `active_selector`.
            if state_for_key.selector_open() {
                // Esc always cancels the selector (even with modifiers off).
                // Route through `SelectList::handle_key(Esc)` so the list's
                // `on_cancel` fires (the `/scoped-models` toggle selector saves
                // its edits there) — the old shortcut called `close_selector`
                // directly and skipped the callback.
                if key.code == KeyCode::Esc {
                    let (selector, _kind) = state_for_key
                        .active_selector
                        .lock()
                        .unwrap()
                        .clone()
                        .expect("selector_open guaranteed Some");
                    selector.handle_key(key);
                    continue;
                }
                let (selector, _kind) = state_for_key
                    .active_selector
                    .lock()
                    .unwrap()
                    .clone()
                    .expect("selector_open guaranteed Some");
                selector.handle_key(key);
                tui_for_key.request_render_reusing_scroll_content();
                continue;
            }

            // 2a. Ctrl+D: upstream's `app.exit`. `handleCtrlD` only fires when
            //     the editor is empty; with text present the key falls through to
            //     the editor's deleteCharForward (`tui.editor.deleteCharForward`).
            //     It never aborts — that is `app.interrupt` (Esc)'s job.
            if keybinding_matches(&keybindings_for_key, &key, rpi_tui::keybindings::keys::EXIT) {
                if !editor_for_key.get_text().is_empty() {
                    // Editor holds text — delete the char forward (pi parity).
                    editor_for_key.handle_key(key);
                    refresh_autocomplete(&state_for_key, &editor_for_key);
                    tui_for_key.request_render_reusing_scroll_content();
                    continue;
                }
                // Empty editor → quit. A parked run needs the forced path: a
                // queued `Exit` is unread until the run returns.
                if *state_for_key.status.lock().unwrap() == RunStatus::Idle {
                    let _ = tx_for_key.send(TuiMessage::Exit);
                } else {
                    emergency_exit(&tui_for_key);
                }
                continue;
            }

            // 2b. Esc: interrupt an active run (mirrors Ctrl+C abort). When a
            //     selector is open Esc already cancelled it above; when idle,
            //     Esc falls through to the editor (no-op-ish). Only fire while
            //     Working so an idle Esc doesn't abort a non-existent run.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::INTERRUPT,
            ) {
                let status = *state_for_key.status.lock().unwrap();
                if status == RunStatus::Working {
                    state_for_key.set_status(RunStatus::Aborting);
                    ask_user_for_key.cancel_all();
                    if !run_extension_cancel(&state_for_key)
                        && state_for_key.extension_dialog_open()
                    {
                        close_extension_editor(
                            &state_for_key,
                            &ctx_for_key.editor_container,
                            &editor_for_key,
                            &tui_for_key,
                        );
                    }
                    // upstream's `onEscape` restores the queue before it
                    // aborts, so an interrupt hands the staged messages back.
                    abort_run_restoring_queue(
                        lane_for_key.clone(),
                        editor_for_key.clone(),
                        state_for_key.clone(),
                        tui_for_key.clone(),
                    );
                    continue;
                }
                // A running `!command` takes Esc next (upstream's `onEscape`
                // precedence: streaming → bash → bash-mode editor →
                // double-escape). The run slot stays occupied until the capture
                // resolves, so a second Esc is a no-op rather than a
                // double-escape trigger.
                if state_for_key.user_bash_running() {
                    state_for_key.cancel_user_bash();
                    tui_for_key.request_render(false);
                    continue;
                }
                if status == RunStatus::Idle
                    && editor_for_key.get_text().trim().is_empty()
                    && double_escape_action != "none"
                {
                    let now = std::time::Instant::now();
                    if double_escape_trigger(last_escape_time, now) {
                        last_escape_time = None;
                        match double_escape_action.as_str() {
                            "tree" => {
                                let _ = tx_for_key.send(TuiMessage::OpenTree);
                            }
                            "fork" => {
                                let _ = tx_for_key.send(TuiMessage::ForkSession);
                            }
                            _ => {}
                        }
                    } else {
                        last_escape_time = Some(now);
                    }
                }
                continue;
            }

            // 2c. Ctrl+G: edit the current draft in the user's external
            // editor, matching upstream's VISUAL/EDITOR fallback chain.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::EXTERNAL_EDITOR,
            ) {
                launch_external_editor(editor_for_key.get_expanded_text(), tx_for_key.clone());
                continue;
            }

            // 2d. Ctrl+O: toggle all tool output panels between compact and
            // expanded rendering (upstream's global output toggle).
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::TOOLS_EXPAND,
            ) {
                let expanded = state_for_key.toggle_tool_outputs();
                // Persist per-session so a later `-c`/`-r` restores it.
                let session = ctx_for_key.session.clone();
                tokio::spawn(async move {
                    let _ = session
                        .set_value("display.tool_outputs_expanded", serde_json::json!(expanded))
                        .await;
                });
                tui_for_key.request_render(false);
                continue;
            }

            // 2e. Ctrl+T: toggle visibility of reasoning/thinking blocks.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::THINKING_TOGGLE,
            ) {
                let hide = state_for_key.toggle_thinking();
                // Persist per-session so a later `-c`/`-r` restores it.
                let session = ctx_for_key.session.clone();
                tokio::spawn(async move {
                    let _ = session
                        .set_value("display.hide_thinking", serde_json::json!(hide))
                        .await;
                });
                tui_for_key.request_render(false);
                continue;
            }

            // 2f. Ctrl+P: cycle to the next model in the catalog after the one
            //     currently tracked in `current_model_id`, apply it live via
            //     `lane.set_model` (takes effect on the next user message — the
            //     in-flight run's config is already snapshotted), and update the
            //     footer. `set_model` is async so it runs on a spawned task.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::MODEL_CYCLE_FORWARD,
            ) {
                let current = state_for_key.current_model_id();
                // Cycle within the `/scoped-models` set (settings.json) when
                // configured; otherwise the full catalog.
                let scope = scoped_catalog(&ctx_for_key.model_catalog, &current);
                if let Some(next) = cycle_next_model(&scope, &current) {
                    state_for_key.set_current_model(&next);
                    let lane = lane_for_key.clone();
                    tokio::spawn(async move {
                        let _ = lane.set_model(next).await;
                    });
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            }

            // 2f-bis. Shift+Ctrl+P (Alt+P on Windows): cycle to the *previous*
            //     model, the mirror of the Ctrl+P hotkey above.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::MODEL_CYCLE_BACKWARD,
            ) {
                let current = state_for_key.current_model_id();
                let scope = scoped_catalog(&ctx_for_key.model_catalog, &current);
                if let Some(prev) = cycle_prev_model(&scope, &current) {
                    state_for_key.set_current_model(&prev);
                    let lane = lane_for_key.clone();
                    tokio::spawn(async move {
                        let _ = lane.set_model(prev).await;
                    });
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            }

            // 2f. Shift+Tab / BackTab: cycle the current model's supported
            // thinking levels, matching upstream's thinking-level shortcut.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::THINKING_CYCLE,
            ) {
                let lane = lane_for_key.clone();
                let catalog = model_catalog_for_key.clone();
                let state = state_for_key.clone();
                tokio::spawn(async move {
                    let Ok(current_model) = lane.get_model().await else {
                        return;
                    };
                    let levels = catalog
                        .iter()
                        .find(|model| {
                            model.provider == current_model.provider && model.id == current_model.id
                        })
                        .map(|model| model.supported_thinking_levels())
                        .unwrap_or_else(|| vec![rpi_ai::types::ThinkingLevel::Medium]);
                    if levels.is_empty() {
                        return;
                    }
                    let current = lane
                        .get_thinking_level()
                        .await
                        .unwrap_or(rpi_ai::types::ThinkingLevel::Medium);
                    let next = levels
                        .iter()
                        .position(|level| *level == current)
                        .map(|index| levels[(index + 1) % levels.len()])
                        .unwrap_or(levels[0]);
                    if lane.set_thinking_level(next).await.is_ok() {
                        state
                            .footer
                            .set_thinking_level(Some(thinking_level_name(next)));
                        state.tui.as_ref().map(|tui| tui.request_render(false));
                    }
                });
                continue;
            }

            // Ctrl+V (or a configured paste-image key): if the system
            // clipboard holds an image, queue it for the next prompt;
            // otherwise paste the clipboard TEXT into the editor. Previously
            // a text-only clipboard fell through to the editor's Ctrl+V,
            // which yanks from the internal KILL RING — not the system
            // clipboard. On platforms without bracketed-paste `Event::Paste`
            // (Windows console, some remote clients) that meant Ctrl+V pasted
            // stale/other content instead of the user's real clipboard
            // ("不是系统的粘贴的内容").
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::PASTE_IMAGE,
            ) {
                match read_clipboard_image() {
                    Ok(Some(image)) => {
                        add_image_preview(&state_for_key.chat_container, &image);
                        state_for_key.queue_image(image);
                        add_note_message(
                            &state_for_key.chat_container,
                            "Clipboard image attached to the next prompt.",
                        );
                        tui_for_key.request_render(false);
                        continue;
                    }
                    Ok(None) | Err(_) => {}
                }
                // The arboard text fallback is Windows-only. On Unix a real
                // paste arrives as `Event::Paste` (bracketed paste is enabled
                // by `ProcessTerminal::enter_raw_mode`), so reading the
                // SERVER's clipboard here would paste stale TUI content on a
                // remote/mobile client — copy-on-select can have written the
                // welcome "Skills (…)" line into the server clipboard, and
                // Ctrl+V on the client returns that instead of the user's own
                // clipboard ("不是系统的粘贴的内容"). On Windows the console
                // never emits `Event::Paste`, so the arboard read is the only
                // paste source and must stay.
                if cfg!(windows) {
                    if let Some(text) = read_clipboard_text() {
                        if !text.is_empty() {
                            editor_for_key.handle_paste(&text);
                            refresh_autocomplete(&state_for_key, &editor_for_key);
                            tui_for_key.request_render_reusing_scroll_content();
                            continue;
                        }
                    }
                }
            }

            // 3. Ctrl+Shift+F: open transcript search
            if key
                .modifiers
                .contains(KeyModifiers::CONTROL | KeyModifiers::SHIFT)
                && key.code == KeyCode::Char('F')
            {
                state_for_key.search.activate();
                state_for_key.search_bar.set_visible(true);
                state_for_key.search_bar.set_query("");
                state_for_key.search_bar.set_match_info(0, 0);
                tui_for_key.request_render(false);
                continue;
            }

            // Handle search mode input
            if state_for_key.search.is_active() {
                let search_bar = state_for_key.search_bar.clone();
                match key.code {
                    KeyCode::Esc => {
                        state_for_key.search.deactivate();
                        search_bar.set_visible(false);
                        tui_for_key.request_render(false);
                        continue;
                    }
                    KeyCode::Enter => {
                        if key.modifiers.contains(KeyModifiers::SHIFT) {
                            state_for_key.search.previous_match();
                        } else {
                            state_for_key.search.next_match();
                        }
                        // Update search bar with current match info
                        let match_index = state_for_key.search.get_match_index();
                        let match_count = state_for_key.search.get_match_count();
                        search_bar.set_match_info(match_index, match_count);
                        tui_for_key.request_render(false);
                        continue;
                    }
                    KeyCode::Backspace => {
                        state_for_key.search.backspace();
                        // Re-search with updated query
                        let lines = collect_transcript_lines(&state_for_key.chat_container);
                        state_for_key.search.find_matches(&lines);
                        // Update search bar
                        let query = state_for_key.search.get_query();
                        let match_count = state_for_key.search.get_match_count();
                        search_bar.set_query(&query);
                        search_bar.set_match_info(0, match_count);
                        tui_for_key.request_render(false);
                        continue;
                    }
                    KeyCode::Char(c) => {
                        state_for_key.search.append_char(c);
                        // Re-search with updated query
                        let lines = collect_transcript_lines(&state_for_key.chat_container);
                        state_for_key.search.find_matches(&lines);
                        // Update search bar
                        let query = state_for_key.search.get_query();
                        let match_count = state_for_key.search.get_match_count();
                        search_bar.set_query(&query);
                        search_bar.set_match_info(0, match_count);
                        tui_for_key.request_render(false);
                        continue;
                    }
                    _ => continue,
                }
            }

            // 3. Ctrl+L: open the model selector. Routed through the `/model`
            //    command so the hotkey and the slash command share one path
            //    (TS binds Ctrl+L to model-select).
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::MODEL_SELECT,
            ) {
                if let Some(cmd) = registry_for_key.find("/model") {
                    cmd.execute(&ctx_for_key, "");
                }
                continue;
            }

            // 4. Tab: accept the top autocomplete suggestion (if any).
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::Tab {
                if accept_top_suggestion(&state_for_key, &editor_for_key) {
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            }

            // 5. Global transcript scroll. PageUp/PageDown use the actual
            // viewport height with four rows of overlap (upstream behavior),
            // while Home/End jump to the transcript boundaries.
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::PageUp {
                let delta = -transcript_page_size(scroll_for_key.viewport_height());
                if scroll_for_key.scroll_by(delta) != delta {
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            }
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::PageDown {
                let delta = transcript_page_size(scroll_for_key.viewport_height());
                if scroll_for_key.scroll_by(delta) != delta {
                    tui_for_key.request_render_reusing_scroll_content();
                }
                continue;
            }
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::Home {
                scroll_for_key.scroll_to_start();
                tui_for_key.request_render_reusing_scroll_content();
                continue;
            }
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::End {
                scroll_for_key.scroll_to_end();
                tui_for_key.request_render_reusing_scroll_content();
                continue;
            }

            // 5b. ↑/↓ browse submitted-message history when the editor is
            //     EMPTY (a fresh prompt) — mirrors TS historyPrevious/Next
            //     without the surprise of replacing typed text. When the
            //     editor holds content, ↑/↓ fall through to cursor movement
            //     (typing "hello", pressing ↑ at the start, must never swap
            //     the draft for a history entry — reported as "text
            //     disappeared"). Once browsing, ↓ walks back and restores the
            //     draft.
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::Up {
                let browsing = *state_for_key.history_index.lock().unwrap() != -1;
                if editor_for_key.get_text().is_empty() || browsing {
                    navigate_history(&state_for_key, &editor_for_key, -1);
                    tui_for_key.request_render_reusing_scroll_content();
                    continue;
                }
            }
            if key.modifiers == KeyModifiers::NONE && key.code == KeyCode::Down {
                let browsing = *state_for_key.history_index.lock().unwrap() != -1;
                if editor_for_key.get_text().is_empty() || browsing {
                    navigate_history(&state_for_key, &editor_for_key, 1);
                    tui_for_key.request_render_reusing_scroll_content();
                    continue;
                }
            }

            // `app.message.dequeue` (Alt+Q on Windows, Alt+Up elsewhere):
            // restore every queued steering/follow-up message into the editor
            // so it can be edited before resending. Mirrors upstream's
            // `handleDequeue`; the pending-messages display shows the hint.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::DEQUEUE,
            ) {
                // Handled here, on the key worker — NOT via the mailbox. The
                // async main loop parks inside `run_prompt_streaming(..).await`
                // for the whole run, and a queue only exists *while* a run is
                // in flight, so a `TuiMessage::Dequeue` sat unread until the
                // run finished (after the lane had already consumed the queue).
                // Alt+Q therefore looked like a no-op while it was most needed.
                // Spawn the drain so it lands while the user is still looking at
                // the queue, exactly like the Alt+Enter `follow_up` path above.
                // Routed through `handle_dequeue` (not the raw restore) so the
                // `Restored N queued message(s)` status note fires, mirroring
                // upstream's `handleDequeue`.
                tokio::spawn(handle_dequeue(
                    lane_for_key.clone(),
                    editor_for_key.clone(),
                    state_for_key.clone(),
                    tui_for_key.clone(),
                ));
                continue;
            }

            // `app.message.followUp` (Alt+Enter; Ctrl+Q and Alt+Enter on
            // Windows) queues a follow-up while a run is active. It is handled
            // here because Editor treats only a bare Enter as submit; when idle
            // the same key keeps the normal prompt behavior.
            if keybinding_matches(
                &keybindings_for_key,
                &key,
                rpi_tui::keybindings::keys::MESSAGE_FOLLOW_UP,
            ) {
                let prompt = editor_for_key.get_expanded_text().trim().to_string();
                if prompt.is_empty() {
                    continue;
                }
                editor_for_key.clear();
                let status = *state_for_key.status.lock().unwrap();
                if status == RunStatus::Idle {
                    if state_for_key.try_start_working() {
                        // Direct send: the harness emits no user `message_start`
                        // for it, so render the bubble here (see the submit
                        // handler in `interactive_tui`).
                        add_user_message(&state_for_key.chat_container, &prompt);
                        push_history(&state_for_key, &prompt);
                        let _ = tx_for_key.send(TuiMessage::UserInput(prompt));
                    }
                } else {
                    // Follow-ups are echoed by the loop's
                    // `AgentEvent::MessageStart` once they are consumed; while
                    // they wait, the pending-messages display shows them.
                    let message = AgentMessage::User(UserMessage::new(prompt, 0));
                    let lane = lane_for_key.clone();
                    let chat = state_for_key.chat_container.clone();
                    let tui = tui_for_key.clone();
                    let state = state_for_key.clone();
                    tokio::spawn(async move {
                        if let Err(error) = lane.follow_up(message).await {
                            add_error_message(&chat, &format!("Could not queue message: {error}"));
                            tui.request_render(false);
                            return;
                        }
                        refresh_pending_messages(&state, &lane).await;
                        tui.request_render(false);
                    });
                }
                tui_for_key.request_render(false);
                continue;
            }

            // Windows' console backend has no Event::Paste. Assemble text keys
            // into one payload; only absorb Enter when another key is queued
            // or the clipboard confirms a trailing pasted newline. A standalone
            // Enter must reach Editor::handle_key so it submits normally.
            if cfg!(windows) {
                let text_key = match key.code {
                    KeyCode::Char(c)
                        if !key
                            .modifiers
                            .intersects(KeyModifiers::CONTROL | KeyModifiers::ALT) =>
                    {
                        Some(c)
                    }
                    _ => None,
                };
                if let Some(ch) = text_key {
                    if ch == '\r' || ch == '\n' {
                        // Treat these the same as KeyCode::Enter below.
                    } else {
                        windows_paste_run.feed(ch, std::time::Instant::now());
                        continue;
                    }
                }
                if key.modifiers.is_empty()
                    && matches!(
                        key.code,
                        KeyCode::Enter | KeyCode::Char('\n') | KeyCode::Char('\r')
                    )
                {
                    let (more_queued, stashed) = probe_paste_input(pending_event.take(), || {
                        if crossterm::event::poll(PASTE_PROBE).unwrap_or(false) {
                            crossterm::event::read().ok()
                        } else {
                            None
                        }
                    });
                    pending_event = stashed;
                    let clipboard = if !more_queued && windows_paste_run.burst {
                        read_clipboard_text()
                    } else {
                        None
                    };
                    if windows_enter_in_paste(&windows_paste_run, more_queued, clipboard.as_deref())
                    {
                        windows_paste_run.feed('\n', std::time::Instant::now());
                        crate::key_trace::note("windows paste run -> newline");
                        continue;
                    }
                    crate::key_trace::note("windows paste run -> flush + submit");
                    windows_paste_run.flush(&editor_for_key);
                } else {
                    windows_paste_run.flush(&editor_for_key);
                }
            }

            // 6. Otherwise forward to the editor + refresh autocomplete. The
            //    editor maps unmodified Enter and the encodings a remote client
            //    may send for it (`Char('\n')`/`Char('\r')`, and the raw LF
            //    crossterm reports as `Ctrl+J`) to submit, so a remote Enter
            //    sends instead of inserting a newline.
            editor_for_key.handle_key(key);
            refresh_autocomplete(&state_for_key, &editor_for_key);
            tui_for_key.request_render_reusing_scroll_content();
        }
    });

    // ---- Session lifecycle (P1): SessionStart ----
    // The TUI + key worker are up and the session is ready to accept input.
    // Notify subscribed extensions now so they can initialize session-scoped
    // state. A veto here is **advisory** (the session is already up) — warn and
    // continue. No-op when no extension subscribes.
    if let Some(reason) = crate::session::dispatch_session_event_async(
        reload_context,
        rpi_plugin_sdk::EventTag::SessionStart,
    )
    .await
    {
        tracing::warn!("[rpi] extension vetoed SessionStart (advisory): {reason}");
    }

    // ---- Initial prompts (run before reading from the channel) ----
    let mut prompts: Vec<String> = Vec::new();
    if let Some(init) = initial {
        prompts.push(init);
    }
    for m in extra_messages {
        prompts.push(m.clone());
    }
    // ---- Continue a run that recovery repaired, the way upstream does ----
    // This happens before any user input, and only when nothing was passed on the
    // command line: an explicit `-p` means the user has already said what they
    // want next. Driven here rather than inside the harness so the run's output
    // goes through the same streaming/render path as any other run, and so
    // startup is never blocked by a run the user cannot see.
    if prompts.is_empty() && lane.has_pending_resume().await {
        run_prompt_streaming(
            &lane,
            "",
            true,
            &tui,
            &state,
            drain_handle.is_some(),
            Vec::new(),
        )
        .await;
    }

    let mut images = initial_images;
    for prompt in prompts {
        if !*running.lock().unwrap() {
            break;
        }
        // The harness emits no user `message_start` for a directly-sent prompt
        // (it drives the loop with an empty prompts vec), so the initial
        // `-p` / `--prompt` bubbles are rendered here.
        add_user_message(&chat_container, &prompt);
        tui.request_render(false);
        run_prompt_streaming(
            &lane,
            &prompt,
            false,
            &tui,
            &state,
            drain_handle.is_some(),
            std::mem::take(&mut images),
        )
        .await;
    }

    // ---- Main loop: process submitted input + lifecycle messages ----
    loop {
        if !*running.lock().unwrap() {
            break;
        }
        match rx.recv().await {
            Some(TuiMessage::UserInput(prompt)) => {
                // Clear the editor so the next prompt starts fresh (the submit
                // handler runs on the blocking key thread and can't mutate the
                // editor state safely there; clearing here, on the async loop,
                // keeps it on one thread). Marked programmatic: this is the host
                // tidying up after a submit, not the user typing — reporting it
                // as a user edit made a hands-free voice session switch itself
                // off the moment it was started.
                state.clear_editor_programmatically();
                let prompt_images = state.take_pending_images();
                if !prompt_images.is_empty() {
                    add_note_message(
                        &chat_container,
                        &format!("Attached {} image(s) to this prompt.", prompt_images.len()),
                    );
                }
                run_prompt_streaming(
                    &lane,
                    &prompt,
                    false,
                    &tui,
                    &state,
                    drain_handle.is_some(),
                    prompt_images,
                )
                .await;
            }
            Some(TuiMessage::ExternalEditorResult(result)) => {
                match result {
                    Ok(text) => {
                        let cursor = text.chars().count();
                        editor.set_text(&text);
                        editor.set_cursor(0, cursor);
                        add_note_message(&chat_container, "Draft updated from external editor.");
                    }
                    Err(error) => add_error_message(&chat_container, &error),
                }
                tui.request_render(false);
            }
            Some(TuiMessage::UserBashFinished(report)) => {
                // Free the run slot first: the guard and the Esc router both
                // read it, so a finished command must never block the next one.
                state.finish_user_bash();
                let message = rpi_harness::messages::bash_execution_message(
                    report.command,
                    report.output,
                    report.exit_code,
                    report.cancelled,
                    report.truncated,
                    report.full_output_path,
                    Some(report.exclude_from_context),
                    now_ms(),
                );
                // While a run is in flight the message is deferred so it is not
                // spliced into the middle of a turn's tool sequence; it is
                // flushed at `AgentEnd` (upstream `_pendingBashMessages`).
                if *state.status.lock().unwrap() == RunStatus::Idle {
                    if let Err(error) = lane.append_message(message).await {
                        add_error_message(
                            &chat_container,
                            &format!("Could not record bash result: {error}"),
                        );
                        tui.request_render(false);
                    }
                } else {
                    state.pending_bash_messages.lock().unwrap().push(message);
                }
            }
            Some(TuiMessage::OpenTree) => {
                if *state.status.lock().unwrap() != RunStatus::Idle {
                    add_note_message(
                        &chat_container,
                        "Wait for the current run to finish before opening the tree.",
                    );
                    tui.request_render(false);
                } else {
                    open_tree_selector(
                        &harness,
                        &state,
                        &editor_container,
                        &editor,
                        &tui,
                        &chat_container,
                        &tx,
                    )
                    .await;
                }
            }
            Some(TuiMessage::NavigateTree(entry_id)) => {
                match lane.navigate_tree(Some(&entry_id), false, None, None).await {
                    Ok(result) => match result.outcome {
                        rpi_harness::agent_harness::NavigationOutcome::Completed { .. } => {
                            chat_container.clear();
                            add_welcome_message(&chat_container);
                            render_session_history(
                                &harness,
                                &chat_container,
                                state.markdown_transformer(),
                                Some(state.extension_session.clone()),
                            )
                            .await;
                            add_note_message(
                                &chat_container,
                                "Moved to the selected session entry.",
                            );
                        }
                        rpi_harness::agent_harness::NavigationOutcome::Failed { error, .. } => {
                            add_error_message(&chat_container, &error.message);
                        }
                        _ => add_note_message(
                            &chat_container,
                            "The selected entry could not be opened.",
                        ),
                    },
                    Err(error) => add_error_message(
                        &chat_container,
                        &format!("Could not navigate session tree: {error}"),
                    ),
                }
                tui.request_render(false);
            }
            Some(TuiMessage::ClearChat) => {
                chat_container.clear();
                add_welcome_message(&chat_container);
                tui.request_render(false);
            }
            Some(TuiMessage::Compact) => {
                run_compact(&lane, &tui, &state).await;
            }
            Some(TuiMessage::Copy) => {
                copy_last_assistant(&state, &chat_container);
                tui.request_render(false);
            }
            Some(TuiMessage::Exit) => {
                *running.lock().unwrap() = false;
                break;
            }
            Some(TuiMessage::SwitchSession(id)) => {
                switch_to_session(
                    &harness,
                    &lane,
                    &id,
                    &cwd,
                    &chat_container,
                    &state,
                    &reload_context.tool_context,
                )
                .await;
                tui.request_render(false);
            }
            Some(TuiMessage::ImportSession(path)) => {
                import_session(
                    &harness,
                    &lane,
                    &path,
                    &cwd,
                    &chat_container,
                    &state,
                    &reload_context.tool_context,
                )
                .await;
                tui.request_render(false);
            }
            Some(TuiMessage::ShareSession) => {
                share_session(&harness, &chat_container).await;
                tui.request_render(false);
            }
            Some(TuiMessage::SetSessionName(name)) => {
                let outcome = harness.session().set_name(Some(&name)).await;
                match outcome {
                    Ok(_) => add_note_message(
                        &chat_container,
                        &format!("Session renamed to \"{name}\"."),
                    ),
                    Err(e) => add_error_message(
                        &chat_container,
                        &format!("Could not rename session: {e}"),
                    ),
                }
                tui.request_render(false);
            }
            Some(TuiMessage::ExportSession) => {
                let file_name = agent_session
                    .default_export_file_name(crate::export::ExportFormat::Markdown)
                    .await;
                let path = cwd.join(&file_name);
                match agent_session.export_to_markdown(&path).await {
                    Ok(_) => add_note_message(
                        &chat_container,
                        &format!("Exported session to {}", path.display()),
                    ),
                    Err(e) => {
                        add_error_message(&chat_container, &format!("Could not write export: {e}"))
                    }
                }
                tui.request_render(false);
            }
            Some(TuiMessage::ExportSessionWithFormat(format)) => {
                let file_name = agent_session.default_export_file_name(format.clone()).await;
                let path = cwd.join(&file_name);
                match agent_session.export(format, &path).await {
                    Ok(_) => add_note_message(
                        &chat_container,
                        &format!("Exported session to {}", path.display()),
                    ),
                    Err(e) => {
                        add_error_message(&chat_container, &format!("Could not write export: {e}"))
                    }
                }
                tui.request_render(false);
            }
            Some(TuiMessage::ShowUsage) => {
                let stats = agent_session.usage_stats().await.ok();
                let total = agent_session.total_usage().await.ok();
                let snapshot = agent_session.snapshot().await.ok();
                match stats {
                    Some(stats) => {
                        let mut lines = vec![
                            "## Usage".to_string(),
                            String::new(),
                            format!("- messages: {}", stats.message_count),
                            format!("- total tokens: {}", stats.total_tokens),
                            format!("- cached tokens: {}", stats.cached_tokens),
                            format!("- uncached tokens: {}", stats.uncached_tokens),
                            format!("- cost: ${:.4}", stats.cost_total),
                        ];
                        match stats.cache_hit_ratio() {
                            Some(ratio) => {
                                lines.push(format!("- cache hit ratio: {:.1}%", ratio * 100.0))
                            }
                            None => lines.push("- cache hit ratio: n/a (no input yet)".to_string()),
                        }
                        if let Some(total) = total {
                            lines.push(String::new());
                            lines.push(format!(
                                "- last cumulative input/output: {} / {}",
                                total.input, total.output
                            ));
                        }
                        if let Some(snapshot) = snapshot {
                            lines.push(String::new());
                            lines.push(format!("- lane: `{}`", snapshot.lane));
                            lines.push(format!(
                                "- leaf: `{}`",
                                snapshot.leaf_id.clone().unwrap_or_else(|| "(empty)".into())
                            ));
                            if let Some(active) = &snapshot.active {
                                lines.push(format!(
                                    "- active operation: {} (`{}`)",
                                    active.kind.as_str(),
                                    active.run_id
                                ));
                            }
                        }
                        add_note_message(&chat_container, &lines.join("\n"));
                    }
                    None => {
                        add_error_message(&chat_container, "Could not read session usage stats.")
                    }
                }
                tui.request_render(false);
            }
            Some(TuiMessage::ForkSession) => {
                fork_session(
                    &harness,
                    &cwd,
                    &chat_container,
                    &state,
                    &reload_context.tool_context,
                )
                .await;
                tui.request_render(false);
            }
            Some(TuiMessage::ReloadExtensions) => {
                // B5d: drive the shared reload routine on the async runtime,
                // then surface the outcome. `reload_context` was passed into
                // `interactive_tui` and is the same `Arc<ReloadContext>` the
                // `ReloadCommand` + the plugin mailbox both route through —
                // clone the `Arc` out so the borrow of `harness` (the main
                // loop's `&AgentHarness`) lives across the await.
                let reload_ctx = ctx.reload_context.clone();
                add_note_message(&chat_container, "Reloading extensions + resources…");
                tui.request_render(false);
                let outcome =
                    crate::session::reload_extension_resources(&harness, &reload_ctx).await;
                // B5e: the reload swapped a fresh `ExtensionSession` into the
                // context's cell. Rebuild the markdown transformer from that
                // fresh snapshot and install it on the in-flight streaming
                // component (so a reloaded plugin's transformer takes effect on
                // the visible message immediately) + future components (they
                // read `state.markdown_transformer()` at construction). The old
                // closure no-ops once its snapshot's `active` flag flips false
                // (reload already did that before the swap).
                let fresh_transformer = build_markdown_transformer(
                    reload_ctx.extension_session.lock().unwrap().snapshot_arc(),
                );
                state.set_markdown_transformer_with_reinstall(fresh_transformer);
                if outcome.had_errors {
                    // Hard failure: the summary itself carries the error detail
                    // (e.g. "Settings reload failed: …"), so render it as an
                    // error without an extra stderr pointer.
                    add_error_message(&chat_container, &outcome.summary);
                } else if outcome.had_warnings {
                    // Reload succeeded but produced soft diagnostics (skill
                    // shadowing, name validation, …). The details are printed
                    // to stderr; keep this as an informational note so a
                    // successful reload isn't shown as a red ✗ error.
                    add_note_message(
                        &chat_container,
                        &format!(
                            "{} (with warnings — see stderr for details).",
                            outcome.summary
                        ),
                    );
                } else {
                    add_note_message(&chat_container, &outcome.summary);
                }
                tui.request_render(false);
            }
            None => break,
        }
    }

    // ---- Shutdown ----
    ask_user_bridge.shutdown();
    *running.lock().unwrap() = false;
    for handle in update_check_handles {
        handle.abort();
        let _ = handle.await;
    }
    // The input worker checks `running` at least every 50ms. Join it before
    // restoring cooked mode so no late event read races terminal cleanup.
    let _ = key_handle.await;
    tick_handle.abort();
    if let Some(handle) = drain_handle {
        handle.abort();
    }
    // Drop the reload bridge: clearing the mailbox closes the signal channel,
    // the drain task's `recv` returns `None`, and the task exits. (Aborting is
    // redundant — the recv terminates — but cheap + makes shutdown explicit.)
    reload_context.mailbox.clear();
    reload_bridge_handle.abort();
    tui.stop(Default::default());

    // upstream prints how to resume the session after an interactive exit so
    // a terminal that scrolled away can be recovered. Mirrors
    // `formatResumeCommand` (id + `--session-dir` only when non-default).
    let session_id = harness.session().storage().metadata().id;
    if let Some(command) = format_resume_command(&session_id, &cwd, args.session_dir.as_deref()) {
        println!("\x1b[2mTo resume this session:\x1b[0m {command}");
    }
    println!("\nGoodbye!");
    let _ = args;

    0
}

// ===========================================================================
// TUI support + entry detection
// ===========================================================================

/// Check if the terminal supports TUI mode.
pub fn is_tui_supported() -> bool {
    std::io::stdout().is_terminal()
}

// Keep the `Color` import used (theme accent rendering in autocomplete).
#[allow(unused_imports)]
use rpi_tui::Color as _Color;