par-term 0.49.0

//! Standalone egui overlay renderers used inside `submit_gpu_frame`.
//!
//! Each function in this module is a pure free function that takes only the data
//! it needs and an `egui::Context`.  They contain no borrow of `self`, which lets
//! them be called freely from inside the `egui_ctx.run_ui(|ctx| { ... })` closure
//! while `self.renderer` is mutably borrowed.

use crate::config::ScrollbackMark;
use crate::copy_mode::VisualMode;
use par_term_config::text::truncate_chars;

/// Render the FPS / frame-time debug overlay in the top-right corner.
///
/// Only renders when `show_fps` is `true`.
pub(super) fn render_fps_overlay(
    ctx: &egui::Context,
    show_fps: bool,
    fps_value: f64,
    frame_time_ms: f64,
) {
    if !show_fps {
        return;
    }
    egui::Area::new(egui::Id::new("fps_overlay"))
        .anchor(egui::Align2::RIGHT_TOP, egui::vec2(-30.0, 10.0))
        .order(egui::Order::Foreground)
        .show(ctx, |ui| {
            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(0, 0, 0, 200))
                .inner_margin(egui::Margin::same(8))
                .corner_radius(4.0)
                .show(ui, |ui| {
                    ui.style_mut().visuals.override_text_color =
                        Some(egui::Color32::from_rgb(0, 255, 0));
                    ui.label(
                        egui::RichText::new(format!(
                            "FPS: {:.1}\nFrame: {:.2}ms",
                            fps_value, frame_time_ms
                        ))
                        .monospace()
                        .size(14.0),
                    );
                });
        });
}

/// Render the resize overlay (centered) showing current grid/pixel dimensions.
///
/// Only renders when `resize_overlay_visible` is `true` and `dimensions` is `Some`.
pub(super) fn render_resize_overlay(
    ctx: &egui::Context,
    resize_overlay_visible: bool,
    dimensions: Option<(u32, u32, usize, usize)>,
) {
    if !resize_overlay_visible {
        return;
    }
    let Some((width_px, height_px, cols, rows)) = dimensions else {
        return;
    };
    egui::Area::new(egui::Id::new("resize_overlay"))
        .anchor(egui::Align2::CENTER_CENTER, egui::vec2(0.0, 0.0))
        .order(egui::Order::Foreground)
        .show(ctx, |ui| {
            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(0, 0, 0, 220))
                .inner_margin(egui::Margin::same(16))
                .corner_radius(8.0)
                .show(ui, |ui| {
                    ui.style_mut().visuals.override_text_color =
                        Some(egui::Color32::from_rgb(255, 255, 255));
                    ui.label(
                        egui::RichText::new(format!(
                            "{}×{}\n{}×{} px",
                            cols, rows, width_px, height_px
                        ))
                        .monospace()
                        .size(24.0),
                    );
                });
        });
}

/// Render the IME preedit (composing) text at the terminal cursor.
///
/// Shows a small composition box directly under the cursor row while an IME
/// composition is active, mirroring the inline preedit other terminals draw.
/// `cursor_rect` is the focused cursor's rect in logical points; when `None`
/// (cursor hidden or scrolled into scrollback) the overlay anchors at the
/// bottom-left so an active composition is never fully invisible.
pub(super) fn render_ime_preedit_overlay(
    ctx: &egui::Context,
    preedit: Option<&str>,
    cursor_rect: Option<(f32, f32, f32, f32)>,
) {
    let Some(text) = preedit else { return };
    if text.is_empty() {
        return;
    }
    ensure_ime_fallback_font(ctx);

    let screen = ctx.input(|i| i.viewport_rect());
    let area = egui::Area::new(egui::Id::new("ime_preedit_overlay")).order(egui::Order::Foreground);
    let area = match cursor_rect {
        Some((x, y, _w, h)) => {
            let pos = egui::pos2(
                x.min(screen.right() - 40.0),
                (y + h).min(screen.bottom() - h),
            );
            area.fixed_pos(pos)
        }
        None => area.anchor(egui::Align2::LEFT_BOTTOM, egui::vec2(10.0, -30.0)),
    };
    let font_size = cursor_rect
        .map(|(_, _, _, h)| (h * 0.85).clamp(10.0, 22.0))
        .unwrap_or(14.0);
    area.show(ctx, |ui| {
        egui::Frame::NONE
            .fill(egui::Color32::from_rgba_unmultiplied(30, 30, 30, 240))
            .inner_margin(egui::Margin::symmetric(8, 4))
            .corner_radius(4.0)
            .stroke(egui::Stroke::new(
                1.0,
                egui::Color32::from_rgb(100, 149, 237).additive(),
            ))
            .show(ui, |ui| {
                ui.style_mut().visuals.override_text_color =
                    Some(egui::Color32::from_rgb(240, 240, 240));
                ui.label(egui::RichText::new(text).size(font_size).underline());
            });
    });
}

/// egui's bundled fonts cover Latin scripts only; CJK preedit text would
/// render as tofu boxes. Lazily install the first readable system CJK font
/// as a fallback family member so Japanese/Chinese composition is legible.
/// No-op when none of the candidates exists (Latin preedit still renders
/// with the bundled font) and runs at most once per process.
fn ensure_ime_fallback_font(ctx: &egui::Context) {
    use std::sync::atomic::{AtomicBool, Ordering};
    static TRIED: AtomicBool = AtomicBool::new(false);
    if TRIED.swap(true, Ordering::Relaxed) {
        return;
    }
    install_cjk_fallback_font(ctx);
}

/// Try the system CJK font candidates and install the first readable one as
/// an egui fallback family member. Builds on the full shipped stack
/// (`nerd_font::font_definitions`) — `set_fonts` replaces everything — so
/// the nerd and braille fallbacks survive. Returns whether a font was installed.
fn install_cjk_fallback_font(ctx: &egui::Context) -> bool {
    for path in CJK_FONT_CANDIDATES {
        let Ok(bytes) = std::fs::read(path) else {
            continue;
        };
        ctx.set_fonts(cjk_font_definitions(bytes));
        return true;
    }
    false
}

/// The CJK fallback composed onto the full shipped stack — the pure half of
/// [`install_cjk_fallback_font`], so a test can assert the nerd and braille
/// fallbacks survive the install.
fn cjk_font_definitions(bytes: Vec<u8>) -> egui::FontDefinitions {
    let mut fonts = crate::settings_ui::nerd_font::font_definitions();
    fonts.font_data.insert(
        "ime_cjk".into(),
        std::sync::Arc::new(egui::FontData::from_owned(bytes)),
    );
    for family in [egui::FontFamily::Proportional, egui::FontFamily::Monospace] {
        fonts
            .families
            .entry(family)
            .or_default()
            .push("ime_cjk".into());
    }
    fonts
}

/// System fonts with CJK coverage, tried in order for the IME preedit overlay.
#[cfg_attr(not(test), allow(dead_code))]
const CJK_FONT_CANDIDATES: &[&str] = {
    #[cfg(target_os = "macos")]
    {
        &[
            "/System/Library/Fonts/Hiragino Sans GB.ttc",
            "/System/Library/Fonts/Supplemental/Arial Unicode.ttf",
            "/System/Library/Fonts/Supplemental/Songti.ttc",
        ]
    }
    #[cfg(target_os = "linux")]
    {
        &[
            "/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc",
            "/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
            "/usr/share/fonts/opentype/noto/NotoSansCJK.ttc",
        ]
    }
    #[cfg(not(any(target_os = "macos", target_os = "linux")))]
    {
        &[
            r"C:\Windows\Fonts\YuGothM.ttc",
            r"C:\Windows\Fonts\msgothic.ttc",
            r"C:\Windows\Fonts\msyh.ttc",
        ]
    }
};

/// Render the scrollbar mark tooltip near the mouse pointer.
///
/// The tooltip shows command, time, duration, and exit code from a `ScrollbackMark`.
/// It is shown when the user hovers over a scrollbar mark; pass `None` to skip.
pub(super) fn render_scrollbar_mark_tooltip(ctx: &egui::Context, mark: Option<&ScrollbackMark>) {
    let Some(mark) = mark else {
        return;
    };

    let mut lines = Vec::new();

    if let Some(ref cmd) = mark.command {
        let truncated = if cmd.chars().count() > 50 {
            format!("{}...", truncate_chars(cmd, 47))
        } else {
            cmd.clone()
        };
        lines.push(format!("Command: {}", truncated));
    }

    if let Some(start_time) = mark.start_time {
        use chrono::{DateTime, Local, Utc};
        let dt = DateTime::<Utc>::from_timestamp_millis(start_time as i64)
            .expect("window_state: start_time millis out of valid timestamp range");
        let local: DateTime<Local> = dt.into();
        lines.push(format!("Time: {}", local.format("%H:%M:%S")));
    }

    if let Some(duration_ms) = mark.duration_ms {
        if duration_ms < 1000 {
            lines.push(format!("Duration: {}ms", duration_ms));
        } else if duration_ms < 60000 {
            lines.push(format!("Duration: {:.1}s", duration_ms as f64 / 1000.0));
        } else {
            let mins = duration_ms / 60000;
            let secs = (duration_ms % 60000) / 1000;
            lines.push(format!("Duration: {}m {}s", mins, secs));
        }
    }

    if let Some(exit_code) = mark.exit_code {
        lines.push(format!("Exit: {}", exit_code));
    }

    let tooltip_text = lines.join("\n");

    let mouse_pos = ctx.pointer_hover_pos().unwrap_or(egui::pos2(100.0, 100.0));
    let tooltip_x = (mouse_pos.x - 180.0).max(10.0);
    let tooltip_y = (mouse_pos.y - 20.0).max(10.0);

    egui::Area::new(egui::Id::new("scrollbar_mark_tooltip"))
        .order(egui::Order::Tooltip)
        .fixed_pos(egui::pos2(tooltip_x, tooltip_y))
        .show(ctx, |ui| {
            ui.set_min_width(150.0);
            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(30, 30, 30, 240))
                .inner_margin(egui::Margin::same(8))
                .corner_radius(4.0)
                .stroke(egui::Stroke::new(1.0, egui::Color32::from_rgb(80, 80, 80)))
                .show(ui, |ui| {
                    ui.set_min_width(140.0);
                    ui.style_mut().visuals.override_text_color =
                        Some(egui::Color32::from_rgb(220, 220, 220));
                    ui.label(egui::RichText::new(&tooltip_text).monospace().size(12.0));
                });
        });
}

/// Render the copy-mode status bar overlay pinned to the bottom-left of the window.
///
/// Shows the current copy-mode type (COPY / VISUAL / V-LINE / V-BLOCK / SEARCH) and
/// status text.  Only renders when `active` and `show_status` are both `true`.
pub(super) fn render_copy_mode_status_bar(
    ctx: &egui::Context,
    active: bool,
    show_status: bool,
    is_searching: bool,
    visual_mode: VisualMode,
    mode_text_str: &str,
    status: &str,
) {
    if !active || !show_status {
        return;
    }
    let color = if is_searching {
        egui::Color32::from_rgb(255, 165, 0)
    } else {
        match visual_mode {
            VisualMode::None => egui::Color32::from_rgb(100, 200, 100),
            VisualMode::Char | VisualMode::Line | VisualMode::Block => {
                egui::Color32::from_rgb(100, 150, 255)
            }
        }
    };
    egui::Area::new(egui::Id::new("copy_mode_status_bar"))
        .anchor(egui::Align2::LEFT_BOTTOM, egui::vec2(0.0, 0.0))
        .order(egui::Order::Foreground)
        .show(ctx, |ui| {
            let available_width = ui.available_width();
            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(40, 40, 40, 230))
                .inner_margin(egui::Margin::symmetric(12, 6))
                .show(ui, |ui| {
                    ui.set_min_width(available_width);
                    ui.horizontal(|ui| {
                        ui.label(
                            egui::RichText::new(mode_text_str)
                                .monospace()
                                .size(13.0)
                                .color(color)
                                .strong(),
                        );
                        ui.separator();
                        ui.label(
                            egui::RichText::new(status)
                                .monospace()
                                .size(12.0)
                                .color(egui::Color32::from_rgb(200, 200, 200)),
                        );
                    });
                });
        });
}

/// Render the automation confirmation dialog (center modal).
///
/// Serves every producer that queues onto `pending_trigger_actions`: output
/// triggers, profile auto-switch commands, and script `WriteText`. A producer
/// that is not an output trigger registers a `TriggerState::automation_action_notes`
/// entry so the dialog does not claim terminal output caused the action.
///
/// Shows the first pending action and presents Allow Once / Always Allow / Deny buttons.
/// On approval: moves the action to whichever approved queue matches its target —
/// `approved_pending_actions` for the active tab, `approved_targeted_actions` when the
/// action names a tab of its own. On deny: discards the action.
///
/// `target_note` is the caller-resolved sentence naming that tab (see
/// `WindowState::pending_action_target_note`). It must be present whenever the head
/// action carries a target: approving a write into a tab the user cannot see is only
/// legitimate if the dialog says which tab that is.
///
/// Not on `overlay::confirm`: Escape must stay inert here, because Deny discards
/// the queued action and Always Allow is an approval (see `confirm.rs`).
///
/// Uses `trigger_prompt_activated_frame` as a flicker guard to prevent the click that opens
/// the dialog from immediately dismissing it.
pub(super) fn render_trigger_prompt_dialog(
    ctx: &egui::Context,
    trigger_state: &mut crate::app::window_state::TriggerState,
    target_note: Option<&str>,
) {
    if trigger_state.pending_trigger_actions.is_empty() {
        trigger_state.trigger_prompt_dialog_open = false;
        trigger_state.trigger_prompt_activated_frame = None;
        return;
    }

    // A targeted action the caller could not name is one whose tab closed
    // between `prune_orphaned_pending_actions` and this frame. Withholding the
    // dialog makes "a targeted prompt always names its tab" true by
    // construction rather than by convention; the next prune withdraws it.
    if trigger_state.pending_trigger_actions[0].target.is_some() && target_note.is_none() {
        trigger_state.trigger_prompt_dialog_open = false;
        trigger_state.trigger_prompt_activated_frame = None;
        return;
    }

    // Record activation frame on first open (flicker guard)
    if !trigger_state.trigger_prompt_dialog_open {
        trigger_state.trigger_prompt_dialog_open = true;
        trigger_state.trigger_prompt_activated_frame = Some(ctx.cumulative_frame_nr());
    }

    let activated_frame = trigger_state.trigger_prompt_activated_frame.unwrap_or(0);
    let current_frame = ctx.cumulative_frame_nr();

    // Extract display info before the egui closure to avoid re-borrowing trigger_state inside it
    let trigger_name = trigger_state.pending_trigger_actions[0]
        .trigger_name
        .clone();
    let description = trigger_state.pending_trigger_actions[0].description.clone();
    let pending_count = trigger_state.pending_trigger_actions.len();

    // Actions that no output trigger produced carry their own source sentence;
    // without one, this is a trigger and the default sentence is accurate.
    let action_id = trigger_state.pending_trigger_actions[0].trigger_id;
    let source_note = trigger_state
        .automation_action_notes
        .get(&action_id)
        .cloned();
    let source_label = if source_note.is_some() {
        format!("Source: {}", trigger_name)
    } else {
        format!("Trigger: {}", trigger_name)
    };
    let source_note = source_note.unwrap_or_else(|| {
        "A trigger matched terminal output and wants to run this action.".to_string()
    });

    let mut approved = false;
    let mut always_approve = false;
    let mut denied = false;

    egui::Window::new("Automation Action Confirmation")
        .id(egui::Id::new("trigger_prompt_dialog"))
        .collapsible(false)
        .resizable(false)
        .anchor(egui::Align2::CENTER_CENTER, egui::vec2(0.0, 0.0))
        .show(ctx, |ui| {
            ui.set_min_width(380.0);
            ui.set_max_width(500.0);

            ui.add_space(4.0);
            ui.label(
                egui::RichText::new("Automation Action Requires Confirmation")
                    .strong()
                    .size(15.0),
            );
            ui.add_space(8.0);
            ui.label(source_label.as_str());
            ui.add_space(4.0);

            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(0, 0, 0, 40))
                .inner_margin(egui::Margin::same(8))
                .corner_radius(4.0)
                .show(ui, |ui| {
                    ui.label(egui::RichText::new(&description).monospace());
                });

            ui.add_space(4.0);
            ui.label(egui::RichText::new(source_note.as_str()).weak().small());

            // Where the write lands. Rendered at full strength rather than as
            // weak small print like the source note above: for a background tab
            // this is the part of the dialog that changes the decision.
            if let Some(note) = target_note {
                ui.add_space(6.0);
                ui.label(
                    egui::RichText::new(note)
                        .strong()
                        .color(egui::Color32::from_rgb(230, 170, 60)),
                );
            }

            ui.add_space(12.0);
            ui.separator();
            ui.add_space(8.0);

            ui.horizontal(|ui| {
                if ui
                    .button(egui::RichText::new("Deny").color(egui::Color32::from_rgb(220, 60, 60)))
                    .clicked()
                    && current_frame > activated_frame
                {
                    denied = true;
                }
                ui.add_space(4.0);
                if ui.button("Allow Once").clicked() && current_frame > activated_frame {
                    approved = true;
                }
                ui.add_space(4.0);
                if ui
                    .button(
                        egui::RichText::new("Always Allow")
                            .color(egui::Color32::from_rgb(80, 180, 80)),
                    )
                    .clicked()
                    && current_frame > activated_frame
                {
                    always_approve = true;
                    approved = true;
                }
            });

            if pending_count > 1 {
                ui.add_space(4.0);
                ui.label(
                    egui::RichText::new(format!("({} more pending actions)", pending_count - 1))
                        .weak()
                        .small(),
                );
            }
        });

    if denied || approved {
        let pending = trigger_state.pending_trigger_actions.remove(0);
        trigger_state
            .automation_action_notes
            .remove(&pending.trigger_id);
        if approved {
            if always_approve {
                trigger_state
                    .always_allow_trigger_ids
                    .insert(pending.trigger_id);
            }
            match pending.target {
                Some(target) => trigger_state
                    .approved_targeted_actions
                    .push((target, pending.action)),
                None => trigger_state.approved_pending_actions.push(pending.action),
            }
        }
        if trigger_state.pending_trigger_actions.is_empty() {
            trigger_state.trigger_prompt_dialog_open = false;
            trigger_state.trigger_prompt_activated_frame = None;
        } else {
            // More actions queued — reset activated frame for the next one
            trigger_state.trigger_prompt_activated_frame = Some(ctx.cumulative_frame_nr());
        }
    }
}

/// Render large pane index labels centered on each pane (used by the "identify panes" feature).
///
/// Each entry in `pane_bounds` is `(pane_index, PaneBounds)`.
/// Renders nothing when `pane_bounds` is empty.
pub(super) fn render_pane_identify_overlay(
    ctx: &egui::Context,
    pane_bounds: &[(usize, crate::pane::PaneBounds)],
) {
    for (index, bounds) in pane_bounds {
        let center_x = bounds.x + bounds.width / 2.0;
        let center_y = bounds.y + bounds.height / 2.0;
        egui::Area::new(egui::Id::new(format!("pane_identify_{}", index)))
            .fixed_pos(egui::pos2(center_x - 30.0, center_y - 30.0))
            .order(egui::Order::Foreground)
            .interactable(false)
            .show(ctx, |ui| {
                egui::Frame::NONE
                    .fill(egui::Color32::from_rgba_unmultiplied(0, 0, 0, 200))
                    .inner_margin(egui::Margin::symmetric(16, 8))
                    .corner_radius(8.0)
                    .stroke(egui::Stroke::new(
                        2.0,
                        egui::Color32::from_rgb(100, 200, 255),
                    ))
                    .show(ui, |ui| {
                        ui.label(
                            egui::RichText::new(format!("Pane {}", index))
                                .monospace()
                                .size(28.0)
                                .color(egui::Color32::from_rgb(100, 200, 255)),
                        );
                    });
            });
    }
}

/// Broadcast receiver outlines (UX.md V5): a colored border on every pane
/// that receives broadcast input.
pub(super) fn render_broadcast_outlines(ctx: &egui::Context, panes: &[crate::pane::PaneBounds]) {
    if panes.is_empty() {
        return;
    }
    let painter = ctx.layer_painter(egui::LayerId::new(
        egui::Order::Foreground,
        egui::Id::new("broadcast_outlines"),
    ));
    let ppp = ctx.pixels_per_point();
    for b in panes {
        let rect = egui::Rect::from_min_size(
            egui::pos2(b.x / ppp, b.y / ppp),
            egui::vec2(b.width / ppp, b.height / ppp),
        )
        .shrink(1.5);
        painter.rect_stroke(
            rect,
            0.0,
            egui::Stroke::new(2.0, BROADCAST_OUTLINE_COLOR),
            egui::StrokeKind::Inside,
        );
    }
}

/// Broadcast outline color: amber, distinct from the focus indicator.
const BROADCAST_OUTLINE_COLOR: egui::Color32 = egui::Color32::from_rgb(255, 176, 32);

/// Badge entries for the pane-hint selection mode: (label, pane bounds).
pub(super) struct PaneHintBadge {
    /// One letter, or two once a tab has more than 26 panes (V7).
    pub(super) label: String,
    pub(super) bounds: crate::pane::PaneBounds,
}

/// Pane-hint selection badges (tmux `display-panes` style): one letter on a
/// circle background, centered in each pane. A modal mode per the mode-stack
/// contract — this draws above every plugin overlay and the mode owns the
/// key stream while armed.
pub(super) fn render_pane_hint_overlay(ctx: &egui::Context, badges: &[PaneHintBadge]) {
    for badge in badges {
        let center_x = badge.bounds.x + badge.bounds.width / 2.0;
        let center_y = badge.bounds.y + badge.bounds.height / 2.0;
        // Circle body: 56px diameter, accent fill, thin dark outline.
        let radius = 28.0;
        let center = egui::pos2(center_x, center_y);
        let painter = ctx.layer_painter(egui::LayerId::new(
            egui::Order::Foreground,
            egui::Id::new("pane_hint_badges"),
        ));
        painter.circle_filled(
            center,
            radius,
            egui::Color32::from_rgba_unmultiplied(0, 0, 0, 200),
        );
        painter.circle_stroke(
            center,
            radius,
            egui::Stroke::new(2.0, egui::Color32::from_rgb(100, 200, 255)),
        );
        painter.text(
            center,
            egui::Align2::CENTER_CENTER,
            &badge.label,
            egui::FontId::monospace(if badge.label.chars().count() > 1 {
                24.0
            } else {
                32.0
            }),
            egui::Color32::from_rgb(100, 200, 255),
        );
    }
}

/// First-run confirmation dialog for an agent-authored script command (D4b).
///
/// Shows the full command body and offers Run / Cancel. Run persists the
/// approved body hash to the confirmation ledger (later runs of the same
/// body need no dialog) and hands the file back for execution; Cancel drops
/// it. The flicker guard (`confirm_dialog_activated_frame`) follows the
/// `render_trigger_prompt_dialog` pattern so the keypress that opened the
/// palette row cannot also click a button on this same frame.
///
/// Not on `overlay::confirm`: Cancel drops the command unread and Run is an
/// approval, so Escape stays inert (see `confirm.rs`).
pub(super) fn render_agent_command_confirm_dialog(
    ctx: &egui::Context,
    store: &mut crate::agent_commands_store::AgentCommandStore,
) -> Option<par_term_config::agent_commands::AgentCommandFile> {
    if store.pending_confirmations.is_empty() {
        store.confirm_dialog_activated_frame = None;
        return None;
    }

    if store.confirm_dialog_activated_frame.is_none() {
        store.confirm_dialog_activated_frame = Some(ctx.cumulative_frame_nr());
    }
    let activated_frame = store.confirm_dialog_activated_frame.unwrap_or(0);
    let current_frame = ctx.cumulative_frame_nr();

    // Display info extracted before the egui closure to avoid re-borrowing.
    let head = &store.pending_confirmations[0];
    let title = head.file.title().to_string();
    let id = head.file.id().to_string();
    let source_line = match &head.file.source_agent {
        Some(agent) => format!("Agent command from {agent}"),
        None => "Agent command".to_string(),
    };
    // The script body shown for approval: command plus args, monospaced.
    let body = match &head.file.action {
        par_term_config::CustomActionConfig::ShellCommand { command, args, .. } => {
            let mut s = command.clone();
            for a in args {
                s.push(' ');
                s.push_str(a);
            }
            s
        }
        // Unreachable: only script commands are queued.
        _ => String::new(),
    };
    let queued_count = store.pending_confirmations.len();

    let mut approved = false;
    let mut denied = false;

    egui::Window::new("Agent Command Confirmation")
        .id(egui::Id::new("agent_command_confirm_dialog"))
        .collapsible(false)
        .resizable(false)
        .anchor(egui::Align2::CENTER_CENTER, egui::vec2(0.0, 0.0))
        .show(ctx, |ui| {
            ui.set_min_width(380.0);
            ui.set_max_width(520.0);

            ui.add_space(4.0);
            ui.label(
                egui::RichText::new(format!("Run agent command \u{201c}{title}\u{201d}?"))
                    .strong()
                    .size(15.0),
            );
            ui.add_space(8.0);
            ui.label(egui::RichText::new(&source_line).weak().small());
            ui.label(
                egui::RichText::new(format!("id: {id}"))
                    .weak()
                    .small()
                    .monospace(),
            );
            ui.add_space(6.0);

            egui::Frame::NONE
                .fill(egui::Color32::from_rgba_unmultiplied(0, 0, 0, 40))
                .inner_margin(egui::Margin::same(8))
                .corner_radius(4.0)
                .show(ui, |ui| {
                    ui.label(egui::RichText::new(&body).monospace());
                });

            ui.add_space(4.0);
            ui.label(
                egui::RichText::new(
                    "First run of this command body. Approving remembers it until the \
                     command changes.",
                )
                .weak()
                .small(),
            );

            ui.add_space(12.0);
            ui.separator();
            ui.add_space(8.0);

            ui.horizontal(|ui| {
                if ui
                    .button(
                        egui::RichText::new("Cancel").color(egui::Color32::from_rgb(220, 60, 60)),
                    )
                    .clicked()
                    && current_frame > activated_frame
                {
                    denied = true;
                }
                ui.add_space(4.0);
                if ui
                    .button(egui::RichText::new("Run").color(egui::Color32::from_rgb(80, 180, 80)))
                    .clicked()
                    && current_frame > activated_frame
                {
                    approved = true;
                }
            });

            if queued_count > 1 {
                ui.add_space(4.0);
                ui.label(
                    egui::RichText::new(format!("({} more queued commands)", queued_count - 1))
                        .weak()
                        .small(),
                );
            }
        });

    if approved {
        let file = store.approve_head();
        if store.pending_confirmations.is_empty() {
            store.confirm_dialog_activated_frame = None;
        } else {
            store.confirm_dialog_activated_frame = Some(ctx.cumulative_frame_nr());
        }
        file
    } else {
        if denied {
            store.cancel_head();
        }
        if store.pending_confirmations.is_empty() {
            store.confirm_dialog_activated_frame = None;
        }
        None
    }
}

#[cfg(test)]
mod ime_tests {
    use super::{CJK_FONT_CANDIDATES, install_cjk_fallback_font, render_ime_preedit_overlay};

    fn run_with(preedit: Option<&str>, cursor_rect: Option<(f32, f32, f32, f32)>) -> egui::Context {
        let ctx = egui::Context::default();
        let input = egui::RawInput {
            screen_rect: Some(egui::Rect::from_min_size(
                egui::pos2(0.0, 0.0),
                egui::vec2(800.0, 600.0),
            )),
            ..Default::default()
        };
        let mut output = ctx.run_ui(input, |ctx| {
            render_ime_preedit_overlay(ctx, preedit, cursor_rect);
        });
        // No GPU backend in the test: acknowledge the font-texture rebuild
        // the CJK fallback install schedules, or the delta asserts on drop.
        output.textures_delta.clear();
        ctx
    }

    #[test]
    fn preedit_overlay_renders_for_all_branches_without_panicking() {
        // Cursor-rect branch, bottom-left fallback branch, and the no-op cases.
        run_with(Some("あいう"), Some((100.0, 200.0, 8.0, 16.0)));
        run_with(Some("composing"), None);
        run_with(Some(""), Some((0.0, 0.0, 8.0, 16.0)));
        run_with(None, None);
    }

    #[test]
    fn preedit_overlay_installs_cjk_fallback_when_a_system_font_exists() {
        // The render-side once-guard already ran in the branches test above,
        // so exercise the installer directly on a fresh context.
        let ctx = egui::Context::default();
        let has_candidate = CJK_FONT_CANDIDATES
            .iter()
            .any(|p| std::path::Path::new(p).exists());
        assert_eq!(
            install_cjk_fallback_font(&ctx),
            has_candidate,
            "a system CJK font exists, so composing text must not render as tofu"
        );
    }

    #[test]
    fn cjk_composition_preserves_shipped_fallbacks() {
        // The IME overlay's install composes onto the shipped stack instead
        // of replacing it: the nerd font (tab icons) and, where the system
        // provides one, the braille fallback must survive `set_fonts`.
        let fonts = super::cjk_font_definitions(Vec::new());
        assert!(fonts.font_data.contains_key("ime_cjk"));
        assert!(fonts.font_data.contains_key("nerd_font_symbols"));
        for family in [egui::FontFamily::Proportional, egui::FontFamily::Monospace] {
            let list = &fonts.families[&family];
            assert!(list.iter().any(|f| f == "ime_cjk"), "{family:?}");
            assert!(list.iter().any(|f| f == "nerd_font_symbols"), "{family:?}");
        }
        let shipped = crate::settings_ui::nerd_font::font_definitions();
        if shipped.font_data.contains_key("braille_fallback") {
            assert!(fonts.font_data.contains_key("braille_fallback"));
        }
    }
}