use anyhow::Result;

#[cfg(not(coverage))]
use {
    super::clipboard::send_clipboard_to_remote,
    super::devices::DeviceCatalog,
    super::diagnostics::quality_probe_command,
    super::launcher_focus_signal_path,
    super::preview::{LauncherPreview, PreviewBinding},
    super::runtime_env_vars,
    super::state::{DisplaySurface, InputRouting, LauncherState},
    super::LAUNCHER_FOCUS_SIGNAL_ENV,
    gtk::glib,
    gtk::prelude::*,
    std::cell::RefCell,
    std::path::{Path, PathBuf},
    std::process::{Child, Command},
    std::rc::Rc,
    std::time::Duration,
};

#[cfg(not(coverage))]
const INPUT_CONTROL_ENV: &str = "LESAVKA_LAUNCHER_INPUT_CONTROL";
#[cfg(not(coverage))]
const INPUT_STATE_ENV: &str = "LESAVKA_LAUNCHER_INPUT_STATE";
#[cfg(not(coverage))]
const DEFAULT_INPUT_CONTROL_PATH: &str = "/tmp/lesavka-launcher-input.control";
#[cfg(not(coverage))]
const DEFAULT_INPUT_STATE_PATH: &str = "/tmp/lesavka-launcher-input.state";

#[cfg(not(coverage))]
#[derive(Clone)]
struct SummaryWidgets {
    relay_value: gtk::Label,
    routing_value: gtk::Label,
    displays_value: gtk::Label,
    shortcut_value: gtk::Label,
}

#[cfg(not(coverage))]
#[derive(Clone)]
struct DisplayPaneWidgets {
    root: gtk::Box,
    stack: gtk::Stack,
    picture: gtk::Picture,
    stream_status: gtk::Label,
    placeholder: gtk::Label,
    action_button: gtk::Button,
    preview_binding: Option<PreviewBinding>,
    title: String,
}

#[cfg(not(coverage))]
struct PopoutWindowHandle {
    window: gtk::ApplicationWindow,
    binding: PreviewBinding,
}

#[cfg(not(coverage))]
#[derive(Clone)]
struct LauncherWidgets {
    status_label: gtk::Label,
    summary: SummaryWidgets,
    display_panes: [DisplayPaneWidgets; 2],
    start_button: gtk::Button,
    stop_button: gtk::Button,
    input_toggle_button: gtk::Button,
    clipboard_button: gtk::Button,
    toggle_key_combo: gtk::ComboBoxText,
}

#[cfg(not(coverage))]
pub fn run_gui_launcher(server_addr: String) -> Result<()> {
    let app = gtk::Application::builder()
        .application_id("dev.lesavka.launcher")
        .build();
    let catalog = Rc::new(DeviceCatalog::discover());
    let state = Rc::new(RefCell::new(LauncherState::new()));
    state.borrow_mut().apply_catalog_defaults(&catalog);
    let child_proc = Rc::new(RefCell::new(None::<Child>));
    let server_addr = Rc::new(server_addr);
    let focus_signal_path = Rc::new(launcher_focus_signal_path());
    let input_control_path = Rc::new(input_control_path());
    let input_state_path = Rc::new(input_state_path());
    let _ = std::fs::remove_file(focus_signal_path.as_path());
    let _ = std::fs::remove_file(input_control_path.as_path());
    let _ = std::fs::remove_file(input_state_path.as_path());

    {
        let child_proc = Rc::clone(&child_proc);
        let focus_signal_path = Rc::clone(&focus_signal_path);
        let input_control_path = Rc::clone(&input_control_path);
        let input_state_path = Rc::clone(&input_state_path);
        app.connect_shutdown(move |_| {
            stop_child_process(&child_proc);
            let _ = std::fs::remove_file(focus_signal_path.as_path());
            let _ = std::fs::remove_file(input_control_path.as_path());
            let _ = std::fs::remove_file(input_state_path.as_path());
        });
    }

    {
        let catalog = Rc::clone(&catalog);
        let state = Rc::clone(&state);
        let child_proc = Rc::clone(&child_proc);
        let server_addr = Rc::clone(&server_addr);
        let focus_signal_path = Rc::clone(&focus_signal_path);
        let input_control_path = Rc::clone(&input_control_path);
        let input_state_path = Rc::clone(&input_state_path);

        app.connect_activate(move |app| {
            let window = gtk::ApplicationWindow::builder()
                .application(app)
                .title("Lesavka Launcher")
                .default_width(1120)
                .default_height(920)
                .build();

            let scroll = gtk::ScrolledWindow::new();
            scroll.set_policy(gtk::PolicyType::Never, gtk::PolicyType::Automatic);

            let root = gtk::Box::new(gtk::Orientation::Vertical, 14);
            root.set_margin_start(18);
            root.set_margin_end(18);
            root.set_margin_top(18);
            root.set_margin_bottom(18);

            let heading = gtk::Label::new(Some("Lesavka Control Deck"));
            heading.add_css_class("title-2");
            heading.set_halign(gtk::Align::Start);
            root.append(&heading);

            let status_label = gtk::Label::new(Some(
                "Launcher ready - previews stay here, relay starts only when you ask for it.",
            ));
            status_label.set_halign(gtk::Align::Start);
            status_label.set_wrap(true);
            status_label.set_selectable(true);
            root.append(&status_label);

            let (summary_frame, summary_box) = build_section("Session Status");
            let summary_grid = gtk::Grid::new();
            summary_grid.set_row_spacing(8);
            summary_grid.set_column_spacing(12);
            summary_box.append(&summary_grid);
            let summary = SummaryWidgets {
                relay_value: attach_summary_row(&summary_grid, 0, "Relay", "Stopped"),
                routing_value: attach_summary_row(&summary_grid, 1, "Input Target", "Remote"),
                displays_value: attach_summary_row(
                    &summary_grid,
                    2,
                    "Displays",
                    "Display 1: preview | Display 2: preview",
                ),
                shortcut_value: attach_summary_row(&summary_grid, 3, "Swap Key", "Pause"),
            };
            root.append(&summary_frame);

            let (connection_frame, connection_box) = build_section("Connection");
            let server_row = gtk::Box::new(gtk::Orientation::Horizontal, 10);
            let server_label = gtk::Label::new(Some("Server"));
            server_label.set_halign(gtk::Align::Start);
            let server_entry = gtk::Entry::new();
            server_entry.set_hexpand(true);
            server_entry.set_text(server_addr.as_ref());
            let start_button = gtk::Button::with_label("Start Relay");
            let stop_button = gtk::Button::with_label("Stop Relay");
            server_row.append(&server_label);
            server_row.append(&server_entry);
            server_row.append(&start_button);
            server_row.append(&stop_button);
            connection_box.append(&server_row);
            let connection_note = gtk::Label::new(Some(
                "Starting relay launches the live input/audio session to the remote host. Stopping relay severs that session cleanly.",
            ));
            connection_note.set_wrap(true);
            connection_note.set_halign(gtk::Align::Start);
            connection_box.append(&connection_note);
            root.append(&connection_frame);

            let (inputs_frame, inputs_box) = build_section("Input Routing And Devices");
            let inputs_grid = gtk::Grid::new();
            inputs_grid.set_row_spacing(8);
            inputs_grid.set_column_spacing(12);
            inputs_box.append(&inputs_grid);

            let input_toggle_button = gtk::Button::with_label("Switch To Local Inputs");
            inputs_grid.attach(&gtk::Label::new(Some("Live Input Target")), 0, 0, 1, 1);
            inputs_grid.attach(&input_toggle_button, 1, 0, 1, 1);

            let toggle_key_combo = gtk::ComboBoxText::new();
            toggle_key_combo.append(Some("scrolllock"), "Scroll Lock");
            toggle_key_combo.append(Some("sysrq"), "SysRq / PrtSc");
            toggle_key_combo.append(Some("pause"), "Pause");
            toggle_key_combo.append(Some("f12"), "F12");
            toggle_key_combo.append(Some("f11"), "F11");
            toggle_key_combo.append(Some("f10"), "F10");
            toggle_key_combo.append(Some("off"), "Disabled");
            let _ = toggle_key_combo.set_active_id(Some("pause"));
            inputs_grid.attach(&gtk::Label::new(Some("Swap Key")), 0, 1, 1, 1);
            inputs_grid.attach(&toggle_key_combo, 1, 1, 1, 1);

            let camera_combo = gtk::ComboBoxText::new();
            camera_combo.append(Some("auto"), "auto");
            for camera in &catalog.cameras {
                camera_combo.append(Some(camera), camera);
            }
            set_combo_active_text(&camera_combo, state.borrow().devices.camera.as_deref());
            inputs_grid.attach(&gtk::Label::new(Some("Camera")), 0, 2, 1, 1);
            inputs_grid.attach(&camera_combo, 1, 2, 1, 1);

            let microphone_combo = gtk::ComboBoxText::new();
            microphone_combo.append(Some("auto"), "auto");
            for microphone in &catalog.microphones {
                microphone_combo.append(Some(microphone), microphone);
            }
            set_combo_active_text(
                &microphone_combo,
                state.borrow().devices.microphone.as_deref(),
            );
            inputs_grid.attach(&gtk::Label::new(Some("Microphone")), 0, 3, 1, 1);
            inputs_grid.attach(&microphone_combo, 1, 3, 1, 1);

            let speaker_combo = gtk::ComboBoxText::new();
            speaker_combo.append(Some("auto"), "auto");
            for speaker in &catalog.speakers {
                speaker_combo.append(Some(speaker), speaker);
            }
            set_combo_active_text(&speaker_combo, state.borrow().devices.speaker.as_deref());
            inputs_grid.attach(&gtk::Label::new(Some("Speaker")), 0, 4, 1, 1);
            inputs_grid.attach(&speaker_combo, 1, 4, 1, 1);

            let inputs_note = gtk::Label::new(Some(
                "Press the swap key while relay is running to flip between local and remote input ownership. The launcher reflects that live state and macros stay launcher-only.",
            ));
            inputs_note.set_wrap(true);
            inputs_note.set_halign(gtk::Align::Start);
            inputs_box.append(&inputs_note);
            root.append(&inputs_frame);

            let (displays_frame, displays_box) = build_section("Displays");
            let display_row = gtk::Box::new(gtk::Orientation::Horizontal, 14);
            let left_pane = build_display_pane("Display 1");
            let right_pane = build_display_pane("Display 2");
            display_row.append(&left_pane.root);
            display_row.append(&right_pane.root);
            displays_box.append(&display_row);
            root.append(&displays_frame);

            let (actions_frame, actions_box) = build_section("Remote Actions");
            let clipboard_button = gtk::Button::with_label("Send Clipboard");
            actions_box.append(&clipboard_button);
            let actions_note = gtk::Label::new(Some(
                "Clipboard paste is a launcher action only. It types the current local clipboard into the remote target machine when relay is active.",
            ));
            actions_note.set_wrap(true);
            actions_note.set_halign(gtk::Align::Start);
            actions_box.append(&actions_note);
            root.append(&actions_frame);

            let (diagnostics_frame, diagnostics_box) = build_section("Diagnostics");
            let probe_hint = gtk::Label::new(Some(quality_probe_command()));
            probe_hint.set_halign(gtk::Align::Start);
            probe_hint.set_selectable(true);
            diagnostics_box.append(&probe_hint);
            let diagnostics_note = gtk::Label::new(Some(
                "Keep the hygiene and quality gates green before calling the launcher changes done. Metrics still land in the local Prometheus textfile output.",
            ));
            diagnostics_note.set_wrap(true);
            diagnostics_note.set_halign(gtk::Align::Start);
            diagnostics_box.append(&diagnostics_note);
            root.append(&diagnostics_frame);

            let preview = match LauncherPreview::new(server_addr.as_ref().to_string()) {
                Ok(preview) => Some(Rc::new(preview)),
                Err(err) => {
                    let msg = format!("Preview unavailable: {err}");
                    status_label.set_text(&msg);
                    None
                }
            };

            let mut left_pane = left_pane;
            let mut right_pane = right_pane;
            if let Some(preview) = preview.as_ref() {
                left_pane.preview_binding =
                    preview.install_on_picture(0, &left_pane.picture, &left_pane.stream_status);
                right_pane.preview_binding =
                    preview.install_on_picture(1, &right_pane.picture, &right_pane.stream_status);
            } else {
                left_pane.stream_status.set_text("Preview unavailable");
                right_pane.stream_status.set_text("Preview unavailable");
            }

            let widgets = LauncherWidgets {
                status_label: status_label.clone(),
                summary,
                display_panes: [left_pane.clone(), right_pane.clone()],
                start_button: start_button.clone(),
                stop_button: stop_button.clone(),
                input_toggle_button: input_toggle_button.clone(),
                clipboard_button: clipboard_button.clone(),
                toggle_key_combo: toggle_key_combo.clone(),
            };
            let popouts = Rc::new(RefCell::new([None, None]));
            refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());

            {
                let widgets = widgets.clone();
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                toggle_key_combo.connect_changed(move |_| {
                    refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());
                });
            }

            {
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                let server_entry = server_entry.clone();
                let camera_combo = camera_combo.clone();
                let microphone_combo = microphone_combo.clone();
                let speaker_combo = speaker_combo.clone();
                let input_control_path = Rc::clone(&input_control_path);
                let input_state_path = Rc::clone(&input_state_path);
                let server_addr_fallback = Rc::clone(&server_addr);
                start_button.connect_clicked(move |_| {
                    if child_proc.borrow().is_some() {
                        widgets.status_label.set_text("Relay is already running");
                        refresh_launcher_ui(&widgets, &state.borrow(), true);
                        return;
                    }
                    {
                        let mut state = state.borrow_mut();
                        state.select_camera(selected_combo_value(&camera_combo));
                        state.select_microphone(selected_combo_value(&microphone_combo));
                        state.select_speaker(selected_combo_value(&speaker_combo));
                    }
                    let _ = std::fs::remove_file(input_control_path.as_path());
                    let _ = std::fs::remove_file(input_state_path.as_path());
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    let launch_state = state.borrow().clone();
                    let input_toggle_key = selected_toggle_key(&widgets.toggle_key_combo);
                    match spawn_client_process(
                        &server_addr,
                        &launch_state,
                        &input_toggle_key,
                        input_control_path.as_path(),
                        input_state_path.as_path(),
                    ) {
                        Ok(child) => {
                            *child_proc.borrow_mut() = Some(child);
                            let _ = state.borrow_mut().start_remote();
                            let routing = state.borrow().routing;
                            widgets.status_label.set_text(&format!(
                                "Relay started - input target is {}",
                                routing_name(routing)
                            ));
                        }
                        Err(err) => {
                            widgets
                                .status_label
                                .set_text(&format!("Relay start failed: {err}"));
                        }
                    }
                    refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());
                });
            }

            {
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                stop_button.connect_clicked(move |_| {
                    stop_child_process(&child_proc);
                    let _ = state.borrow_mut().stop_remote();
                    widgets.status_label.set_text("Relay stopped");
                    refresh_launcher_ui(&widgets, &state.borrow(), false);
                });
            }

            {
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                let input_control_path = Rc::clone(&input_control_path);
                input_toggle_button.connect_clicked(move |_| {
                    let next = next_input_routing(state.borrow().routing);
                    let child_running = child_proc.borrow().is_some();
                    if child_running {
                        if let Err(err) =
                            write_input_routing_request(input_control_path.as_path(), next)
                        {
                            widgets.status_label.set_text(&format!(
                                "Could not update live input target: {err}"
                            ));
                            refresh_launcher_ui(&widgets, &state.borrow(), true);
                            return;
                        }
                        widgets.status_label.set_text(&format!(
                            "Requested {} input control - pressing the swap key mirrors this live.",
                            routing_name(next)
                        ));
                    } else {
                        widgets.status_label.set_text(&format!(
                            "Relay will start with {} input control.",
                            routing_name(next)
                        ));
                    }
                    state.borrow_mut().set_routing(next);
                    refresh_launcher_ui(&widgets, &state.borrow(), child_running);
                });
            }

            {
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                let server_entry = server_entry.clone();
                let server_addr_fallback = Rc::clone(&server_addr);
                clipboard_button.connect_clicked(move |_| {
                    if child_proc.borrow().is_none() {
                        widgets.status_label.set_text("Start relay before sending clipboard");
                        return;
                    }
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    widgets.status_label.set_text("Sending clipboard to remote...");
                    let (result_tx, result_rx) = std::sync::mpsc::channel::<String>();
                    std::thread::spawn(move || {
                        let message = match send_clipboard_to_remote(&server_addr) {
                            Ok(mode) => mode,
                            Err(err) => format!("Clipboard send failed: {err}"),
                        };
                        let _ = result_tx.send(message);
                    });

                    let status_label = widgets.status_label.clone();
                    glib::timeout_add_local(Duration::from_millis(100), move || {
                        match result_rx.try_recv() {
                            Ok(message) => {
                                status_label.set_text(&message);
                                glib::ControlFlow::Break
                            }
                            Err(std::sync::mpsc::TryRecvError::Empty) => {
                                glib::ControlFlow::Continue
                            }
                            Err(std::sync::mpsc::TryRecvError::Disconnected) => {
                                status_label
                                    .set_text("Clipboard send failed: launcher worker exited");
                                glib::ControlFlow::Break
                            }
                        }
                    });
                });
            }

            for monitor_id in 0..2 {
                let app = app.clone();
                let preview = preview.clone();
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let popouts = Rc::clone(&popouts);
                let widgets = widgets.clone();
                let action_button = widgets.display_panes[monitor_id].action_button.clone();
                action_button.connect_clicked(move |_| {
                    let Some(preview) = preview.as_ref() else {
                        widgets
                            .status_label
                            .set_text("Preview is unavailable for breakout windows");
                        return;
                    };
                    let surface = state.borrow().display_surface(monitor_id);
                    match surface {
                        DisplaySurface::Preview => {
                            open_popout_window(
                                &app,
                                preview,
                                &state,
                                &child_proc,
                                &popouts,
                                &widgets,
                                monitor_id,
                            );
                            widgets.status_label.set_text(&format!(
                                "{} moved into its own window",
                                widgets.display_panes[monitor_id].title
                            ));
                        }
                        DisplaySurface::Window => {
                            dock_display_to_preview(
                                &state,
                                &child_proc,
                                &popouts,
                                &widgets,
                                monitor_id,
                            );
                            widgets.status_label.set_text(&format!(
                                "{} returned to the launcher preview",
                                widgets.display_panes[monitor_id].title
                            ));
                        }
                    }
                });
            }

            {
                let window = window.clone();
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                let focus_signal_path = Rc::clone(&focus_signal_path);
                let input_state_path = Rc::clone(&input_state_path);
                let last_focus_marker =
                    Rc::new(RefCell::new(path_marker(focus_signal_path.as_path())));
                let last_state_marker =
                    Rc::new(RefCell::new(path_marker(input_state_path.as_path())));
                glib::timeout_add_local(Duration::from_millis(180), move || {
                    let child_running = reap_exited_child(&child_proc);
                    if !child_running && state.borrow().remote_active {
                        let _ = state.borrow_mut().stop_remote();
                        widgets.status_label.set_text("Relay ended");
                    }

                    let next_state_marker = path_marker(input_state_path.as_path());
                    let mut last_state = last_state_marker.borrow_mut();
                    if next_state_marker > *last_state {
                        *last_state = next_state_marker;
                        if let Some(routing) = read_input_routing_state(input_state_path.as_path())
                        {
                            state.borrow_mut().set_routing(routing);
                            refresh_launcher_ui(&widgets, &state.borrow(), child_running);
                        }
                    }

                    let next_focus_marker = path_marker(focus_signal_path.as_path());
                    let mut last_focus = last_focus_marker.borrow_mut();
                    if next_focus_marker > *last_focus {
                        *last_focus = next_focus_marker;
                        state.borrow_mut().set_routing(InputRouting::Local);
                        refresh_launcher_ui(&widgets, &state.borrow(), child_running);
                        widgets
                            .status_label
                            .set_text("Local control restored - launcher focused");
                        window.present();
                    }

                    refresh_launcher_ui(&widgets, &state.borrow(), child_running);
                    glib::ControlFlow::Continue
                });
            }

            scroll.set_child(Some(&root));
            window.set_child(Some(&scroll));
            window.present();
        });
    }

    let _ = app.run_with_args::<&str>(&[]);
    Ok(())
}

#[cfg(coverage)]
pub fn run_gui_launcher(_server_addr: String) -> Result<()> {
    Ok(())
}

#[cfg(not(coverage))]
fn build_section(title: &str) -> (gtk::Frame, gtk::Box) {
    let frame = gtk::Frame::new(Some(title));
    let body = gtk::Box::new(gtk::Orientation::Vertical, 10);
    body.set_margin_start(12);
    body.set_margin_end(12);
    body.set_margin_top(12);
    body.set_margin_bottom(12);
    frame.set_child(Some(&body));
    (frame, body)
}

#[cfg(not(coverage))]
fn attach_summary_row(grid: &gtk::Grid, row: i32, label: &str, value: &str) -> gtk::Label {
    let key = gtk::Label::new(Some(label));
    key.set_halign(gtk::Align::Start);
    let value_label = gtk::Label::new(Some(value));
    value_label.set_halign(gtk::Align::Start);
    value_label.set_selectable(true);
    grid.attach(&key, 0, row, 1, 1);
    grid.attach(&value_label, 1, row, 1, 1);
    value_label
}

#[cfg(not(coverage))]
fn build_display_pane(title: &str) -> DisplayPaneWidgets {
    let root = gtk::Box::new(gtk::Orientation::Vertical, 8);
    root.set_hexpand(true);
    root.set_vexpand(true);

    let title_label = gtk::Label::new(Some(title));
    title_label.add_css_class("title-4");
    title_label.set_halign(gtk::Align::Center);
    root.append(&title_label);

    let picture = gtk::Picture::new();
    picture.set_hexpand(true);
    picture.set_vexpand(true);
    picture.set_can_shrink(true);
    picture.set_size_request(460, 258);

    let preview_box = gtk::Box::new(gtk::Orientation::Vertical, 6);
    preview_box.append(&picture);

    let placeholder = gtk::Label::new(Some("This display is docked in the launcher preview."));
    placeholder.set_wrap(true);
    placeholder.set_justify(gtk::Justification::Center);
    placeholder.set_halign(gtk::Align::Center);
    placeholder.set_valign(gtk::Align::Center);

    let placeholder_box = gtk::Box::new(gtk::Orientation::Vertical, 6);
    placeholder_box.set_hexpand(true);
    placeholder_box.set_vexpand(true);
    placeholder_box.set_size_request(460, 258);
    placeholder_box.append(&placeholder);

    let stack = gtk::Stack::new();
    stack.set_hexpand(true);
    stack.set_vexpand(true);
    stack.add_named(&preview_box, Some("preview"));
    stack.add_named(&placeholder_box, Some("placeholder"));
    stack.set_visible_child_name("preview");
    root.append(&stack);

    let stream_status = gtk::Label::new(Some("Waiting for stream..."));
    stream_status.set_halign(gtk::Align::Start);
    root.append(&stream_status);

    let action_button = gtk::Button::with_label("Break Out");
    action_button.set_halign(gtk::Align::Center);
    root.append(&action_button);

    DisplayPaneWidgets {
        root,
        stack,
        picture,
        stream_status,
        placeholder,
        action_button,
        preview_binding: None,
        title: title.to_string(),
    }
}

#[cfg(not(coverage))]
fn refresh_launcher_ui(widgets: &LauncherWidgets, state: &LauncherState, child_running: bool) {
    widgets.summary.relay_value.set_text(if child_running || state.remote_active {
        "Running"
    } else {
        "Stopped"
    });
    widgets
        .summary
        .routing_value
        .set_text(routing_name(state.routing));
    widgets.summary.displays_value.set_text(&format!(
        "Display 1: {} | Display 2: {}",
        state.display_surface(0).label(),
        state.display_surface(1).label()
    ));
    widgets
        .summary
        .shortcut_value
        .set_text(&selected_toggle_key_label(&widgets.toggle_key_combo));

    widgets.start_button.set_sensitive(!child_running);
    widgets.stop_button.set_sensitive(child_running);
    widgets.clipboard_button.set_sensitive(child_running);
    widgets.input_toggle_button.set_label(match state.routing {
        InputRouting::Remote => "Switch To Local Inputs",
        InputRouting::Local => "Switch To Remote Inputs",
    });

    for monitor_id in 0..2 {
        refresh_display_pane(&widgets.display_panes[monitor_id], state.display_surface(monitor_id));
    }
}

#[cfg(not(coverage))]
fn refresh_display_pane(pane: &DisplayPaneWidgets, surface: DisplaySurface) {
    if let Some(binding) = pane.preview_binding.as_ref() {
        binding.set_enabled(matches!(surface, DisplaySurface::Preview));
    }
    pane.action_button.set_sensitive(pane.preview_binding.is_some());
    match surface {
        DisplaySurface::Preview => {
            pane.stack.set_visible_child_name("preview");
            pane.action_button.set_label("Break Out");
            pane.placeholder
                .set_text("This display is docked in the launcher preview.");
            if pane.preview_binding.is_none() {
                pane.stream_status.set_text("Preview unavailable");
            }
        }
        DisplaySurface::Window => {
            pane.stack.set_visible_child_name("placeholder");
            pane.action_button.set_label("Return To Preview");
            pane.placeholder.set_text(&format!(
                "{} is open in its own window.\nUse \"Return To Preview\" to dock it back here.",
                pane.title
            ));
            pane.stream_status.set_text("Streaming in its own window");
        }
    }
}

#[cfg(not(coverage))]
fn open_popout_window(
    app: &gtk::Application,
    preview: &LauncherPreview,
    state: &Rc<RefCell<LauncherState>>,
    child_proc: &Rc<RefCell<Option<Child>>>,
    popouts: &Rc<RefCell<[Option<PopoutWindowHandle>; 2]>>,
    widgets: &LauncherWidgets,
    monitor_id: usize,
) {
    let already_open = popouts.borrow()[monitor_id].is_some();
    if already_open {
        return;
    }

    if let Some(binding) = widgets.display_panes[monitor_id].preview_binding.as_ref() {
        binding.set_enabled(false);
    }

    let window = gtk::ApplicationWindow::builder()
        .application(app)
        .title(&format!("Lesavka {}", widgets.display_panes[monitor_id].title))
        .default_width(1280)
        .default_height(760)
        .build();
    window.maximize();

    let root = gtk::Box::new(gtk::Orientation::Vertical, 8);
    root.set_margin_start(10);
    root.set_margin_end(10);
    root.set_margin_top(10);
    root.set_margin_bottom(10);

    let title = gtk::Label::new(Some(&widgets.display_panes[monitor_id].title));
    title.add_css_class("title-3");
    title.set_halign(gtk::Align::Center);
    root.append(&title);

    let picture = gtk::Picture::new();
    picture.set_hexpand(true);
    picture.set_vexpand(true);
    picture.set_can_shrink(true);
    root.append(&picture);

    let stream_status = gtk::Label::new(Some("Waiting for stream..."));
    stream_status.set_halign(gtk::Align::Start);
    root.append(&stream_status);

    let binding = preview
        .install_on_picture(monitor_id, &picture, &stream_status)
        .expect("preview binding for popout");

    window.set_child(Some(&root));

    let state_handle = Rc::clone(state);
    let child_proc_handle = Rc::clone(child_proc);
    let popouts_handle = Rc::clone(popouts);
    let widgets_handle = widgets.clone();
    let close_binding = binding.clone();
    window.connect_close_request(move |_| {
        let handle = {
            let mut popouts = popouts_handle.borrow_mut();
            popouts[monitor_id].take()
        };
        if let Some(handle) = handle {
            handle.binding.close();
            if let Some(preview_binding) =
                widgets_handle.display_panes[monitor_id].preview_binding.as_ref()
            {
                preview_binding.set_enabled(true);
            }
            state_handle
                .borrow_mut()
                .set_display_surface(monitor_id, DisplaySurface::Preview);
            refresh_launcher_ui(
                &widgets_handle,
                &state_handle.borrow(),
                child_proc_handle.borrow().is_some(),
            );
        } else {
            close_binding.close();
        }
        glib::Propagation::Proceed
    });

    state
        .borrow_mut()
        .set_display_surface(monitor_id, DisplaySurface::Window);
    popouts.borrow_mut()[monitor_id] = Some(PopoutWindowHandle {
        window: window.clone(),
        binding,
    });
    refresh_launcher_ui(widgets, &state.borrow(), child_proc.borrow().is_some());
    window.present();
}

#[cfg(not(coverage))]
fn dock_display_to_preview(
    state: &Rc<RefCell<LauncherState>>,
    child_proc: &Rc<RefCell<Option<Child>>>,
    popouts: &Rc<RefCell<[Option<PopoutWindowHandle>; 2]>>,
    widgets: &LauncherWidgets,
    monitor_id: usize,
) {
    let handle = {
        let mut popouts = popouts.borrow_mut();
        popouts[monitor_id].take()
    };
    if let Some(handle) = handle {
        handle.binding.close();
        handle.window.close();
    }
    if let Some(binding) = widgets.display_panes[monitor_id].preview_binding.as_ref() {
        binding.set_enabled(true);
    }
    state
        .borrow_mut()
        .set_display_surface(monitor_id, DisplaySurface::Preview);
    refresh_launcher_ui(widgets, &state.borrow(), child_proc.borrow().is_some());
}

#[cfg(not(coverage))]
fn selected_combo_value(combo: &gtk::ComboBoxText) -> Option<String> {
    combo.active_text().and_then(|value| {
        let value = value.to_string();
        let trimmed = value.trim();
        if trimmed.is_empty() || trimmed.eq_ignore_ascii_case("auto") {
            None
        } else {
            Some(trimmed.to_string())
        }
    })
}

#[cfg(not(coverage))]
fn selected_toggle_key(combo: &gtk::ComboBoxText) -> String {
    combo
        .active_id()
        .map(|value| value.to_string())
        .unwrap_or_else(|| "pause".to_string())
}

#[cfg(not(coverage))]
fn selected_toggle_key_label(combo: &gtk::ComboBoxText) -> String {
    combo.active_text()
        .map(|value| value.to_string())
        .unwrap_or_else(|| "Pause".to_string())
}

#[cfg(not(coverage))]
fn selected_server_addr(entry: &gtk::Entry, fallback: &str) -> String {
    let current = entry.text();
    let trimmed = current.trim();
    if trimmed.is_empty() {
        fallback.to_string()
    } else {
        trimmed.to_string()
    }
}

#[cfg(not(coverage))]
fn input_control_path() -> PathBuf {
    std::env::var(INPUT_CONTROL_ENV)
        .map(PathBuf::from)
        .unwrap_or_else(|_| PathBuf::from(DEFAULT_INPUT_CONTROL_PATH))
}

#[cfg(not(coverage))]
fn input_state_path() -> PathBuf {
    std::env::var(INPUT_STATE_ENV)
        .map(PathBuf::from)
        .unwrap_or_else(|_| PathBuf::from(DEFAULT_INPUT_STATE_PATH))
}

#[cfg(not(coverage))]
fn write_input_routing_request(path: &Path, routing: InputRouting) -> Result<()> {
    std::fs::write(path, format!("{}\n", routing_name(routing)))?;
    Ok(())
}

#[cfg(not(coverage))]
fn read_input_routing_state(path: &Path) -> Option<InputRouting> {
    let raw = std::fs::read_to_string(path).ok()?;
    match raw.trim().to_ascii_lowercase().as_str() {
        "local" => Some(InputRouting::Local),
        "remote" => Some(InputRouting::Remote),
        _ => None,
    }
}

#[cfg(not(coverage))]
fn routing_name(routing: InputRouting) -> &'static str {
    match routing {
        InputRouting::Local => "local",
        InputRouting::Remote => "remote",
    }
}

#[cfg(not(coverage))]
fn path_marker(path: &Path) -> u128 {
    std::fs::metadata(path)
        .ok()
        .and_then(|meta| meta.modified().ok())
        .and_then(|stamp| stamp.duration_since(std::time::UNIX_EPOCH).ok())
        .map(|duration| duration.as_millis())
        .unwrap_or_default()
}

#[cfg(not(coverage))]
fn set_combo_active_text(combo: &gtk::ComboBoxText, wanted: Option<&str>) {
    let wanted = wanted.unwrap_or("auto");
    if !combo.set_active_id(Some(wanted)) {
        let _ = combo.set_active_id(Some("auto"));
    }
}

#[cfg(not(coverage))]
fn spawn_client_process(
    server_addr: &str,
    state: &LauncherState,
    input_toggle_key: &str,
    input_control_path: &Path,
    input_state_path: &Path,
) -> Result<Child> {
    let exe = std::env::current_exe()?;
    let mut command = Command::new(exe);
    command.env("LESAVKA_LAUNCHER_CHILD", "1");
    command.env("LESAVKA_SERVER_ADDR", server_addr);
    command.env("LESAVKA_INPUT_TOGGLE_KEY", input_toggle_key);
    command.env("LESAVKA_LAUNCHER_WINDOW_TITLE", "Lesavka Launcher");
    command.env("LESAVKA_FOCUS_LAUNCHER_ON_LOCAL", "1");
    command.env(LAUNCHER_FOCUS_SIGNAL_ENV, launcher_focus_signal_path());
    command.env(INPUT_CONTROL_ENV, input_control_path);
    command.env(INPUT_STATE_ENV, input_state_path);
    command.env("LESAVKA_DISABLE_VIDEO_RENDER", "1");
    command.env("LESAVKA_CLIPBOARD_PASTE", "0");
    for (key, value) in runtime_env_vars(state) {
        command.env(key, value);
    }
    Ok(command.spawn()?)
}

#[cfg(not(coverage))]
fn stop_child_process(child_proc: &Rc<RefCell<Option<Child>>>) {
    if let Some(mut child) = child_proc.borrow_mut().take() {
        let _ = child.kill();
        let _ = child.wait();
    }
}

#[cfg(not(coverage))]
fn reap_exited_child(child_proc: &Rc<RefCell<Option<Child>>>) -> bool {
    let mut slot = child_proc.borrow_mut();
    match slot.as_mut() {
        Some(child) => match child.try_wait() {
            Ok(Some(_)) => {
                *slot = None;
                false
            }
            Ok(None) | Err(_) => true,
        },
        None => false,
    }
}

#[cfg(not(coverage))]
fn next_input_routing(routing: InputRouting) -> InputRouting {
    match routing {
        InputRouting::Remote => InputRouting::Local,
        InputRouting::Local => InputRouting::Remote,
    }
}

#[cfg(all(test, coverage))]
mod tests {
    use super::run_gui_launcher;

    #[test]
    fn coverage_stub_returns_ok() {
        assert!(run_gui_launcher("http://127.0.0.1:50051".to_string()).is_ok());
    }
}