use std::{cell::RefCell, rc::Rc};

use gtk::prelude::*;

use super::{
    devices::DeviceCatalog,
    preview::{LauncherPreview, PreviewBinding},
    state::LauncherState,
};

#[derive(Clone)]
pub struct SummaryWidgets {
    pub relay_value: gtk::Label,
    pub routing_value: gtk::Label,
    pub power_value: gtk::Label,
    pub displays_value: gtk::Label,
    pub shortcut_value: gtk::Label,
}

#[derive(Clone)]
pub struct DisplayPaneWidgets {
    pub root: gtk::Box,
    pub stack: gtk::Stack,
    pub picture: gtk::Picture,
    pub stream_status: gtk::Label,
    pub placeholder: gtk::Label,
    pub action_button: gtk::Button,
    pub preview_binding: Option<PreviewBinding>,
    pub title: String,
}

pub struct PopoutWindowHandle {
    pub window: gtk::ApplicationWindow,
    pub binding: PreviewBinding,
}

#[derive(Clone)]
pub struct LauncherWidgets {
    pub status_label: gtk::Label,
    pub summary: SummaryWidgets,
    pub power_detail: gtk::Label,
    pub display_panes: [DisplayPaneWidgets; 2],
    pub start_button: gtk::Button,
    pub stop_button: gtk::Button,
    pub power_button: gtk::Button,
    pub input_toggle_button: gtk::Button,
    pub clipboard_button: gtk::Button,
    pub probe_button: gtk::Button,
    pub toggle_key_combo: gtk::ComboBoxText,
    pub camera_test_button: gtk::Button,
    pub microphone_test_button: gtk::Button,
    pub speaker_test_button: gtk::Button,
}

pub struct LauncherView {
    pub window: gtk::ApplicationWindow,
    pub server_entry: gtk::Entry,
    pub camera_combo: gtk::ComboBoxText,
    pub microphone_combo: gtk::ComboBoxText,
    pub speaker_combo: gtk::ComboBoxText,
    pub widgets: LauncherWidgets,
    pub preview: Option<Rc<LauncherPreview>>,
    pub popouts: Rc<RefCell<[Option<PopoutWindowHandle>; 2]>>,
}

pub fn build_launcher_view(
    app: &gtk::Application,
    server_addr: &str,
    catalog: &DeviceCatalog,
    state: &LauncherState,
) -> LauncherView {
    let window = gtk::ApplicationWindow::builder()
        .application(app)
        .title("Lesavka Launcher")
        .default_width(1480)
        .default_height(900)
        .build();
    install_css(&window);

    let root = gtk::Box::new(gtk::Orientation::Vertical, 16);
    root.add_css_class("launcher-root");
    root.set_margin_start(20);
    root.set_margin_end(20);
    root.set_margin_top(20);
    root.set_margin_bottom(20);

    let hero = gtk::Box::new(gtk::Orientation::Horizontal, 16);
    hero.set_hexpand(true);

    let brand_box = gtk::Box::new(gtk::Orientation::Vertical, 4);
    let heading = gtk::Label::new(Some("Lesavka Control Deck"));
    heading.add_css_class("title-2");
    heading.set_halign(gtk::Align::Start);
    let subheading = gtk::Label::new(Some(
        "Relay, capture power, device staging, and eye previews in one control surface.",
    ));
    subheading.add_css_class("dim-label");
    subheading.set_halign(gtk::Align::Start);
    brand_box.append(&heading);
    brand_box.append(&subheading);
    hero.append(&brand_box);

    let chips = gtk::Box::new(gtk::Orientation::Horizontal, 10);
    chips.set_halign(gtk::Align::End);
    chips.set_hexpand(true);
    let (relay_chip, relay_value) = build_status_chip("Relay", "Stopped");
    let (routing_chip, routing_value) = build_status_chip("Inputs", "Remote");
    let (power_chip, power_value) = build_status_chip("Capture", "Unknown");
    let (display_chip, displays_value) = build_status_chip("Displays", "Preview");
    let (shortcut_chip, shortcut_value) = build_status_chip("Swap Key", "Pause");
    chips.append(&relay_chip);
    chips.append(&routing_chip);
    chips.append(&power_chip);
    chips.append(&display_chip);
    chips.append(&shortcut_chip);
    hero.append(&chips);
    root.append(&hero);

    let content = gtk::Box::new(gtk::Orientation::Horizontal, 16);
    content.set_hexpand(true);
    content.set_vexpand(true);
    root.append(&content);

    let sidebar = gtk::Box::new(gtk::Orientation::Vertical, 12);
    sidebar.set_size_request(410, -1);
    sidebar.set_valign(gtk::Align::Fill);
    content.append(&sidebar);

    let stage = gtk::Box::new(gtk::Orientation::Vertical, 12);
    stage.set_hexpand(true);
    stage.set_vexpand(true);
    content.append(&stage);

    let (connection_panel, connection_body) = build_panel("Connection");
    let server_row = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let server_entry = gtk::Entry::new();
    server_entry.add_css_class("server-entry");
    server_entry.set_hexpand(true);
    server_entry.set_text(server_addr);
    server_entry.set_tooltip_text(Some(
        "Relay host address for previews, power control, and the live session.",
    ));
    let start_button = gtk::Button::with_label("Start Relay");
    start_button.add_css_class("suggested-action");
    let stop_button = gtk::Button::with_label("Stop Relay");
    stop_button.add_css_class("destructive-action");
    server_row.append(&server_entry);
    server_row.append(&start_button);
    server_row.append(&stop_button);
    connection_body.append(&server_row);

    let power_row = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let power_button = gtk::Button::with_label("Power Up Feeds");
    power_button.set_tooltip_text(Some(
        "Turns the relay.service-backed capture power on or off from the launcher.",
    ));
    let power_detail = gtk::Label::new(Some("Capture power status is loading..."));
    power_detail.add_css_class("dim-label");
    power_detail.set_wrap(true);
    power_detail.set_xalign(0.0);
    power_row.append(&power_button);
    power_row.append(&power_detail);
    connection_body.append(&power_row);
    sidebar.append(&connection_panel);

    let (routing_panel, routing_body) = build_panel("Input Routing");
    let routing_row = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let input_toggle_button = gtk::Button::with_label("Route Inputs To Local");
    input_toggle_button.set_hexpand(true);
    input_toggle_button.set_tooltip_text(Some(
        "Switch live keyboard and mouse ownership between the local machine and the remote target.",
    ));
    routing_row.append(&input_toggle_button);
    routing_body.append(&routing_row);

    let swap_row = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let swap_label = gtk::Label::new(Some("Swap key"));
    swap_label.set_halign(gtk::Align::Start);
    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"));
    toggle_key_combo.set_tooltip_text(Some(
        "Single-key live input swap while the relay is running.",
    ));
    swap_row.append(&swap_label);
    swap_row.append(&toggle_key_combo);
    routing_body.append(&swap_row);
    sidebar.append(&routing_panel);

    let (devices_panel, devices_body) = build_panel("Devices");
    let devices_grid = gtk::Grid::new();
    devices_grid.set_row_spacing(8);
    devices_grid.set_column_spacing(8);
    devices_body.append(&devices_grid);

    let camera_combo = gtk::ComboBoxText::new();
    camera_combo.append(Some("auto"), "auto");
    for camera in &catalog.cameras {
        camera_combo.append(Some(camera), camera);
    }
    super::ui_runtime::set_combo_active_text(&camera_combo, state.devices.camera.as_deref());
    let camera_test_button = gtk::Button::with_label("Test");
    camera_test_button.set_tooltip_text(Some(
        "Open a local preview for the selected webcam so you can confirm the right source.",
    ));
    attach_device_row(
        &devices_grid,
        0,
        "Camera",
        &camera_combo,
        &camera_test_button,
    );

    let microphone_combo = gtk::ComboBoxText::new();
    microphone_combo.append(Some("auto"), "auto");
    for microphone in &catalog.microphones {
        microphone_combo.append(Some(microphone), microphone);
    }
    super::ui_runtime::set_combo_active_text(
        &microphone_combo,
        state.devices.microphone.as_deref(),
    );
    let microphone_test_button = gtk::Button::with_label("Test");
    microphone_test_button.set_tooltip_text(Some(
        "Monitor the selected microphone through the selected speaker until you stop the test.",
    ));
    attach_device_row(
        &devices_grid,
        1,
        "Microphone",
        &microphone_combo,
        &microphone_test_button,
    );

    let speaker_combo = gtk::ComboBoxText::new();
    speaker_combo.append(Some("auto"), "auto");
    for speaker in &catalog.speakers {
        speaker_combo.append(Some(speaker), speaker);
    }
    super::ui_runtime::set_combo_active_text(&speaker_combo, state.devices.speaker.as_deref());
    let speaker_test_button = gtk::Button::with_label("Test");
    speaker_test_button.set_tooltip_text(Some(
        "Play a short continuous tone through the selected speaker until you stop the test.",
    ));
    attach_device_row(
        &devices_grid,
        2,
        "Speaker",
        &speaker_combo,
        &speaker_test_button,
    );
    sidebar.append(&devices_panel);

    let (actions_panel, actions_body) = build_panel("Remote Actions");
    let actions_row = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let clipboard_button = gtk::Button::with_label("Send Clipboard");
    clipboard_button.set_tooltip_text(Some(
        "Type the current local clipboard into the remote target. This stays launcher-only.",
    ));
    let probe_button = gtk::Button::with_label("Copy Gate Probe");
    probe_button.set_tooltip_text(Some(
        "Copy the hygiene/quality probe command into the local clipboard.",
    ));
    actions_row.append(&clipboard_button);
    actions_row.append(&probe_button);
    actions_body.append(&actions_row);
    sidebar.append(&actions_panel);

    let stage_header = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let stage_title = gtk::Label::new(Some("Remote Eyes"));
    stage_title.add_css_class("title-4");
    stage_title.set_halign(gtk::Align::Start);
    stage_header.append(&stage_title);
    stage.append(&stage_header);

    let display_row = gtk::Box::new(gtk::Orientation::Horizontal, 16);
    display_row.set_hexpand(true);
    display_row.set_vexpand(true);
    let left_pane = build_display_pane("Left Eye", "/dev/lesavka_l_eye");
    let right_pane = build_display_pane("Right Eye", "/dev/lesavka_r_eye");
    display_row.append(&left_pane.root);
    display_row.append(&right_pane.root);
    stage.append(&display_row);

    let status_label = gtk::Label::new(Some("Launcher ready."));
    status_label.add_css_class("status-line");
    status_label.set_halign(gtk::Align::Start);
    status_label.set_ellipsize(gtk::pango::EllipsizeMode::End);
    root.append(&status_label);

    let preview = match LauncherPreview::new(server_addr.to_string()) {
        Ok(preview) => Some(Rc::new(preview)),
        Err(err) => {
            status_label.set_text(&format!("Preview unavailable: {err}"));
            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: SummaryWidgets {
            relay_value,
            routing_value,
            power_value,
            displays_value,
            shortcut_value,
        },
        power_detail,
        display_panes: [left_pane.clone(), right_pane.clone()],
        start_button: start_button.clone(),
        stop_button: stop_button.clone(),
        power_button: power_button.clone(),
        input_toggle_button: input_toggle_button.clone(),
        clipboard_button: clipboard_button.clone(),
        probe_button: probe_button.clone(),
        toggle_key_combo: toggle_key_combo.clone(),
        camera_test_button: camera_test_button.clone(),
        microphone_test_button: microphone_test_button.clone(),
        speaker_test_button: speaker_test_button.clone(),
    };
    let popouts = Rc::new(RefCell::new([None, None]));

    window.set_child(Some(&root));

    LauncherView {
        window,
        server_entry,
        camera_combo,
        microphone_combo,
        speaker_combo,
        widgets,
        preview,
        popouts,
    }
}

pub fn install_css(window: &gtk::ApplicationWindow) {
    let provider = gtk::CssProvider::new();
    provider.load_from_data(
        r#"
        window.lesavka-launcher {
            background: #101319;
            color: #eef2f7;
        }
        box.launcher-root {
            background: linear-gradient(180deg, #11161f 0%, #161d28 100%);
        }
        box.panel {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 18px;
            padding: 14px;
        }
        label.panel-title {
            font-weight: 700;
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        box.status-chip {
            background: rgba(91, 179, 162, 0.12);
            border: 1px solid rgba(91, 179, 162, 0.25);
            border-radius: 999px;
            padding: 8px 12px;
        }
        label.status-chip-label {
            font-size: 0.78rem;
            opacity: 0.72;
        }
        label.status-chip-value {
            font-weight: 700;
        }
        box.display-card {
            background: rgba(255, 255, 255, 0.045);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 22px;
            padding: 16px;
        }
        box.display-placeholder {
            background: rgba(255, 255, 255, 0.03);
            border: 1px dashed rgba(255, 255, 255, 0.18);
            border-radius: 16px;
            padding: 24px;
        }
        label.status-line {
            opacity: 0.88;
        }
        entry.server-entry {
            min-height: 38px;
        }
        "#,
    );
    if let Some(display) = gtk::gdk::Display::default() {
        gtk::style_context_add_provider_for_display(
            &display,
            &provider,
            gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
        );
    }
    window.add_css_class("lesavka-launcher");
}

fn build_panel(title: &str) -> (gtk::Box, gtk::Box) {
    let panel = gtk::Box::new(gtk::Orientation::Vertical, 10);
    panel.add_css_class("panel");

    let heading = gtk::Label::new(Some(title));
    heading.add_css_class("panel-title");
    heading.set_halign(gtk::Align::Start);
    panel.append(&heading);

    let body = gtk::Box::new(gtk::Orientation::Vertical, 10);
    panel.append(&body);
    (panel, body)
}

fn build_status_chip(label: &str, value: &str) -> (gtk::Box, gtk::Label) {
    let chip = gtk::Box::new(gtk::Orientation::Vertical, 2);
    chip.add_css_class("status-chip");

    let label_widget = gtk::Label::new(Some(label));
    label_widget.add_css_class("status-chip-label");
    label_widget.set_halign(gtk::Align::Start);
    let value_widget = gtk::Label::new(Some(value));
    value_widget.add_css_class("status-chip-value");
    value_widget.set_halign(gtk::Align::Start);
    chip.append(&label_widget);
    chip.append(&value_widget);
    (chip, value_widget)
}

fn attach_device_row(
    grid: &gtk::Grid,
    row: i32,
    label: &str,
    combo: &gtk::ComboBoxText,
    test_button: &gtk::Button,
) {
    let label_widget = gtk::Label::new(Some(label));
    label_widget.set_halign(gtk::Align::Start);
    combo.set_hexpand(true);
    grid.attach(&label_widget, 0, row, 1, 1);
    grid.attach(combo, 1, row, 1, 1);
    grid.attach(test_button, 2, row, 1, 1);
}

fn build_display_pane(title: &str, capture_path: &str) -> DisplayPaneWidgets {
    let root = gtk::Box::new(gtk::Orientation::Vertical, 10);
    root.add_css_class("display-card");
    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::Start);
    let capture_label = gtk::Label::new(Some(capture_path));
    capture_label.add_css_class("dim-label");
    capture_label.set_halign(gtk::Align::Start);
    root.append(&title_label);
    root.append(&capture_label);

    let picture = gtk::Picture::new();
    picture.set_hexpand(true);
    picture.set_vexpand(true);
    picture.set_can_shrink(true);
    picture.set_size_request(540, 304);

    let preview_box = gtk::Box::new(gtk::Orientation::Vertical, 0);
    preview_box.append(&picture);

    let placeholder = gtk::Label::new(Some(
        "This feed is running in its own window.\nUse Return To Preview to dock it back here.",
    ));
    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.add_css_class("display-placeholder");
    placeholder_box.set_hexpand(true);
    placeholder_box.set_vexpand(true);
    placeholder_box.set_size_request(540, 304);
    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 footer = gtk::Box::new(gtk::Orientation::Horizontal, 8);
    let stream_status = gtk::Label::new(Some("Waiting for stream..."));
    stream_status.set_halign(gtk::Align::Start);
    stream_status.set_hexpand(true);
    let action_button = gtk::Button::with_label("Break Out");
    action_button.set_halign(gtk::Align::End);
    footer.append(&stream_status);
    footer.append(&action_button);
    root.append(&footer);

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