use anyhow::Result;

#[cfg(not(coverage))]
use {
    super::clipboard::send_clipboard_to_remote,
    super::device_test::DeviceTestController,
    super::devices::DeviceCatalog,
    super::diagnostics::quality_probe_command,
    super::launcher_focus_signal_path,
    super::power::{fetch_capture_power, set_capture_power_mode},
    super::state::{CapturePowerStatus, DisplaySurface, InputRouting, LauncherState},
    super::ui_components::build_launcher_view,
    super::ui_runtime::{
        dock_display_to_preview, input_control_path, input_state_path, next_input_routing,
        open_popout_window, path_marker, read_input_routing_state, reap_exited_child,
        refresh_launcher_ui, refresh_test_buttons, routing_name, selected_combo_value,
        selected_server_addr, selected_toggle_key, spawn_client_process, stop_child_process,
        update_test_action_result, write_input_routing_request,
    },
    gtk::glib,
    gtk::prelude::*,
    lesavka_common::lesavka::CapturePowerCommand,
    std::cell::{Cell, RefCell},
    std::process::Child,
    std::rc::Rc,
    std::time::{Duration, Instant},
};

#[cfg(not(coverage))]
enum PowerMessage {
    Poll(std::result::Result<CapturePowerStatus, String>),
    Command(std::result::Result<CapturePowerStatus, String>),
}

#[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 tests = Rc::new(RefCell::new(DeviceTestController::new()));
    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);
        let tests = Rc::clone(&tests);
        app.connect_shutdown(move |_| {
            stop_child_process(&child_proc);
            tests.borrow_mut().stop_all();
            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 tests = Rc::clone(&tests);
        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 view = build_launcher_view(app, server_addr.as_ref(), &catalog, &state.borrow());
            let window = view.window.clone();
            let server_entry = view.server_entry.clone();
            let camera_combo = view.camera_combo.clone();
            let microphone_combo = view.microphone_combo.clone();
            let speaker_combo = view.speaker_combo.clone();
            let widgets = view.widgets.clone();
            let preview = view.preview.clone();
            let popouts = Rc::clone(&view.popouts);

            {
                let mut tests = tests.borrow_mut();
                if let Err(err) = tests.bind_camera_preview(
                    &view.device_stage.camera_preview,
                    &view.device_stage.camera_status,
                ) {
                    widgets
                        .status_label
                        .set_text(&format!("Camera preview setup failed: {err}"));
                }
                if let Err(err) =
                    tests.set_camera_selection(state.borrow().devices.camera.as_deref())
                {
                    widgets
                        .status_label
                        .set_text(&format!("Camera staging setup failed: {err}"));
                }
            }

            refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());
            refresh_test_buttons(&widgets, &mut tests.borrow_mut());

            let (power_tx, power_rx) = std::sync::mpsc::channel::<PowerMessage>();
            let power_request_in_flight = Rc::new(Cell::new(false));
            let last_power_poll = Rc::new(RefCell::new(None::<Instant>));

            {
                let state = Rc::clone(&state);
                let widgets = widgets.clone();
                let child_proc = Rc::clone(&child_proc);
                let tests = Rc::clone(&tests);
                let camera_combo = camera_combo.clone();
                let camera_combo_read = camera_combo.clone();
                camera_combo.connect_changed(move |_| {
                    let selected = selected_combo_value(&camera_combo_read);
                    state.borrow_mut().select_camera(selected.clone());
                    if let Err(err) = tests.borrow_mut().set_camera_selection(selected.as_deref()) {
                        widgets
                            .status_label
                            .set_text(&format!("Camera preview update failed: {err}"));
                    }
                    refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());
                    refresh_test_buttons(&widgets, &mut tests.borrow_mut());
                });
            }

            {
                let state = Rc::clone(&state);
                let widgets = widgets.clone();
                let child_proc = Rc::clone(&child_proc);
                let microphone_combo = microphone_combo.clone();
                let microphone_combo_read = microphone_combo.clone();
                microphone_combo.connect_changed(move |_| {
                    state
                        .borrow_mut()
                        .select_microphone(selected_combo_value(&microphone_combo_read));
                    refresh_launcher_ui(&widgets, &state.borrow(), child_proc.borrow().is_some());
                });
            }

            {
                let state = Rc::clone(&state);
                let widgets = widgets.clone();
                let child_proc = Rc::clone(&child_proc);
                let speaker_combo = speaker_combo.clone();
                let speaker_combo_read = speaker_combo.clone();
                speaker_combo.connect_changed(move |_| {
                    state
                        .borrow_mut()
                        .select_speaker(selected_combo_value(&speaker_combo_read));
                    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);
                let start_button = widgets.start_button.clone();
                let widgets_handle = widgets.clone();
                start_button.connect_clicked(move |_| {
                    if child_proc.borrow().is_some() {
                        widgets_handle
                            .status_label
                            .set_text("Relay is already running.");
                        refresh_launcher_ui(&widgets_handle, &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();
                            widgets_handle.status_label.set_text(&format!(
                                "Relay started. Inputs are routed to {}.",
                                routing_name(state.borrow().routing)
                            ));
                        }
                        Err(err) => {
                            widgets_handle
                                .status_label
                                .set_text(&format!("Relay start failed: {err}"));
                        }
                    }
                    refresh_launcher_ui(
                        &widgets_handle,
                        &state.borrow(),
                        child_proc.borrow().is_some(),
                    );
                });
            }

            {
                let state = Rc::clone(&state);
                let child_proc = Rc::clone(&child_proc);
                let widgets = widgets.clone();
                let stop_button = widgets.stop_button.clone();
                let widgets_handle = widgets.clone();
                stop_button.connect_clicked(move |_| {
                    stop_child_process(&child_proc);
                    let _ = state.borrow_mut().stop_remote();
                    widgets_handle.status_label.set_text("Relay stopped.");
                    refresh_launcher_ui(&widgets_handle, &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);
                let input_toggle_button = widgets.input_toggle_button.clone();
                let widgets_handle = widgets.clone();
                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_handle
                                .status_label
                                .set_text(&format!("Could not update live input target: {err}"));
                            refresh_launcher_ui(&widgets_handle, &state.borrow(), true);
                            return;
                        }
                        widgets_handle.status_label.set_text(&format!(
                            "Input routing switched toward {}.",
                            routing_name(next)
                        ));
                    } else {
                        widgets_handle.status_label.set_text(&format!(
                            "Relay will start with {} input ownership.",
                            routing_name(next)
                        ));
                    }
                    state.borrow_mut().set_routing(next);
                    refresh_launcher_ui(&widgets_handle, &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);
                widgets.clipboard_button.connect_clicked(move |_| {
                    if child_proc.borrow().is_none() {
                        widgets
                            .status_label
                            .set_text("Start the relay before sending clipboard text.");
                        return;
                    }
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    widgets
                        .status_label
                        .set_text("Sending clipboard to the remote target...");
                    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
                            }
                        }
                    });
                });
            }

            {
                let widgets = widgets.clone();
                widgets.probe_button.connect_clicked(move |_| {
                    if let Some(display) = gtk::gdk::Display::default() {
                        let clipboard = display.clipboard();
                        clipboard.set_text(quality_probe_command());
                        widgets
                            .status_label
                            .set_text("Quality probe command copied to the local clipboard.");
                    } else {
                        widgets
                            .status_label
                            .set_text("No desktop clipboard is available in this session.");
                    }
                });
            }

            {
                let widgets = widgets.clone();
                let tests = Rc::clone(&tests);
                let camera_combo = camera_combo.clone();
                let camera_test_button = widgets.camera_test_button.clone();
                let widgets_handle = widgets.clone();
                camera_test_button.connect_clicked(move |_| {
                    let selected = selected_combo_value(&camera_combo);
                    let result = {
                        let mut tests = tests.borrow_mut();
                        let _ = tests.set_camera_selection(selected.as_deref());
                        tests.toggle_camera()
                    };
                    update_test_action_result(
                        &widgets_handle,
                        &mut tests.borrow_mut(),
                        result,
                        "Camera preview started inside the launcher.",
                        "Camera preview stopped.",
                    );
                });
            }

            {
                let widgets = widgets.clone();
                let tests = Rc::clone(&tests);
                let microphone_combo = microphone_combo.clone();
                let speaker_combo = speaker_combo.clone();
                let microphone_test_button = widgets.microphone_test_button.clone();
                let widgets_handle = widgets.clone();
                microphone_test_button.connect_clicked(move |_| {
                    let mic = selected_combo_value(&microphone_combo);
                    let sink = selected_combo_value(&speaker_combo);
                    let result = tests
                        .borrow_mut()
                        .toggle_microphone(mic.as_deref(), sink.as_deref());
                    update_test_action_result(
                        &widgets_handle,
                        &mut tests.borrow_mut(),
                        result,
                        "Microphone monitor started.",
                        "Microphone monitor stopped.",
                    );
                });
            }

            {
                let widgets = widgets.clone();
                let tests = Rc::clone(&tests);
                let speaker_combo = speaker_combo.clone();
                let speaker_test_button = widgets.speaker_test_button.clone();
                let widgets_handle = widgets.clone();
                speaker_test_button.connect_clicked(move |_| {
                    let result = tests
                        .borrow_mut()
                        .toggle_speaker(selected_combo_value(&speaker_combo).as_deref());
                    update_test_action_result(
                        &widgets_handle,
                        &mut tests.borrow_mut(),
                        result,
                        "Speaker test tone started.",
                        "Speaker test tone stopped.",
                    );
                });
            }

            {
                let widgets = widgets.clone();
                let server_entry = server_entry.clone();
                let server_addr_fallback = Rc::clone(&server_addr);
                let power_tx = power_tx.clone();
                let power_request_in_flight = Rc::clone(&power_request_in_flight);
                let power_auto_button = widgets.power_auto_button.clone();
                let widgets_handle = widgets.clone();
                power_auto_button.connect_clicked(move |_| {
                    if power_request_in_flight.replace(true) {
                        return;
                    }
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    widgets_handle
                        .status_label
                        .set_text("Returning capture feeds to automatic mode...");
                    let tx = power_tx.clone();
                    std::thread::spawn(move || {
                        let result =
                            set_capture_power_mode(&server_addr, CapturePowerCommand::Auto)
                                .map_err(|err| err.to_string());
                        let _ = tx.send(PowerMessage::Command(result));
                    });
                });
            }

            {
                let server_entry = server_entry.clone();
                let server_addr_fallback = Rc::clone(&server_addr);
                let power_tx = power_tx.clone();
                let power_request_in_flight = Rc::clone(&power_request_in_flight);
                let power_on_button = widgets.power_on_button.clone();
                let widgets_handle = widgets.clone();
                power_on_button.connect_clicked(move |_| {
                    if power_request_in_flight.replace(true) {
                        return;
                    }
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    widgets_handle
                        .status_label
                        .set_text("Forcing capture feeds on for staging...");
                    let tx = power_tx.clone();
                    std::thread::spawn(move || {
                        let result =
                            set_capture_power_mode(&server_addr, CapturePowerCommand::ForceOn)
                                .map_err(|err| err.to_string());
                        let _ = tx.send(PowerMessage::Command(result));
                    });
                });
            }

            {
                let server_entry = server_entry.clone();
                let server_addr_fallback = Rc::clone(&server_addr);
                let power_tx = power_tx.clone();
                let power_request_in_flight = Rc::clone(&power_request_in_flight);
                let power_off_button = widgets.power_off_button.clone();
                let widgets_handle = widgets.clone();
                power_off_button.connect_clicked(move |_| {
                    if power_request_in_flight.replace(true) {
                        return;
                    }
                    let server_addr =
                        selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                    widgets_handle
                        .status_label
                        .set_text("Forcing capture feeds off for staging...");
                    let tx = power_tx.clone();
                    std::thread::spawn(move || {
                        let result =
                            set_capture_power_mode(&server_addr, CapturePowerCommand::ForceOff)
                                .map_err(|err| err.to_string());
                        let _ = tx.send(PowerMessage::Command(result));
                    });
                });
            }

            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;
                    };
                    match state.borrow().display_surface(monitor_id) {
                        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 tests = Rc::clone(&tests);
                let server_entry = server_entry.clone();
                let server_addr_fallback = Rc::clone(&server_addr);
                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())));
                let power_request_in_flight = Rc::clone(&power_request_in_flight);
                let last_power_poll = Rc::clone(&last_power_poll);
                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 and the launcher is focused.");
                        window.present();
                    }

                    while let Ok(message) = power_rx.try_recv() {
                        power_request_in_flight.set(false);
                        match message {
                            PowerMessage::Poll(Ok(power)) => {
                                state.borrow_mut().set_capture_power(power);
                            }
                            PowerMessage::Poll(Err(err)) => {
                                state.borrow_mut().set_capture_power(CapturePowerStatus {
                                    available: false,
                                    enabled: false,
                                    unit: "relay.service".to_string(),
                                    detail: err,
                                    active_leases: 0,
                                    mode: "auto".to_string(),
                                });
                            }
                            PowerMessage::Command(Ok(power)) => {
                                let mode = power.mode.clone();
                                state.borrow_mut().set_capture_power(power);
                                widgets.status_label.set_text(match mode.as_str() {
                                    "forced-on" => "Capture feeds forced on.",
                                    "forced-off" => "Capture feeds forced off.",
                                    _ => "Capture feeds returned to automatic mode.",
                                });
                            }
                            PowerMessage::Command(Err(err)) => {
                                widgets
                                    .status_label
                                    .set_text(&format!("Capture power update failed: {err}"));
                            }
                        }
                    }

                    let should_poll_power = !power_request_in_flight.get()
                        && last_power_poll
                            .borrow()
                            .map(|stamp| stamp.elapsed() >= Duration::from_millis(1400))
                            .unwrap_or(true);
                    if should_poll_power {
                        *last_power_poll.borrow_mut() = Some(Instant::now());
                        power_request_in_flight.set(true);
                        let server_addr =
                            selected_server_addr(&server_entry, server_addr_fallback.as_ref());
                        let tx = power_tx.clone();
                        std::thread::spawn(move || {
                            let result =
                                fetch_capture_power(&server_addr).map_err(|err| err.to_string());
                            let _ = tx.send(PowerMessage::Poll(result));
                        });
                    }

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

            window.present();
        });
    }

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

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

#[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());
    }
}