BetterFrame/kiosk/src/ui.rs

use std::cell::{Cell, RefCell};
use std::sync::mpsc;
use std::time::{Duration, Instant};
use url::Url;

use gtk4::prelude::*;
use gtk4::{self as gtk, Application, ApplicationWindow, Box as GtkBox, Grid, Label, Orientation, Picture};
use tracing::{info, warn};

use crate::bundle::KioskBundle;
use crate::cec;
use crate::hwmon;
use crate::pipeline;
use crate::server;
use crate::ws_client;
use crate::ServerMsg;

thread_local! {
    /// camera_id → (pipeline, paintable, badge). Pipelines stay warm across
    /// layout swaps for cameras still referenced or in preload_camera_ids.
    /// badge is 'M' / 'S' / ' ' indicating which stream is active.
    static WARM_CAMERAS: RefCell<std::collections::HashMap<u32, (gstreamer::Pipeline, gtk::gdk::Paintable, char)>>
        = RefCell::new(std::collections::HashMap::new());

    /// Most recently rendered bundle. Used for layout-switch + idle revert.
    static CURRENT_BUNDLE: RefCell<Option<KioskBundle>> = const { RefCell::new(None) };

    /// Server URL + kiosk key for re-rendering on layout-switch.
    static CURRENT_AUTH: RefCell<Option<(String, String)>> = const { RefCell::new(None) };

    /// Layout id currently on screen, if any.
    static CURRENT_LAYOUT_ID: Cell<Option<u32>> = const { Cell::new(None) };

    /// Timestamp of the last "activity" event (render, switch, wake).
    static LAST_ACTIVITY: RefCell<Instant> = RefCell::new(Instant::now());

    /// True after we've fired CEC standby due to sleep timeout.
    static IS_ASLEEP: Cell<bool> = const { Cell::new(false) };

    /// Has the idle-watchdog already been installed on the main loop?
    static WATCHDOG_INSTALLED: Cell<bool> = const { Cell::new(false) };
}

const APP_ID: &str = "dev.betterframe.kiosk";
const BETTERFRAME_LOGO_SVG: &str = include_str!("../../server/src/web-static/betterframe-logo.svg");
const BETTERFRAME_MARK_SVG: &str = include_str!("../../server/src/web-static/betterframe-mark.svg");

pub fn build_app() -> Application {
    let app = Application::builder().application_id(APP_ID).build();
    app.connect_activate(activate);
    app
}

fn activate(app: &Application) {
    let window = ApplicationWindow::builder()
        .application(app)
        .title("BetterFrame")
        .fullscreened(true)
        .build();

    let provider = gtk::CssProvider::new();
    provider.load_from_string("window { background-color: #000000; }");
    gtk::style_context_add_provider_for_display(
        &WidgetExt::display(&window),
        &provider,
        gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
    );

    show_logo(&window);
    window.present();

    let (tx, rx) = mpsc::channel::<WorkerMsg>();

    let server_url = std::env::var("BETTERFRAME_SERVER").ok()
        .or_else(|| std::env::args().nth(1));
    std::thread::spawn(move || {
        let server = server::discover_server(server_url.as_deref());
        info!("server: {server}");

        let key = if server::is_paired() {
            info!("already paired");
            server::load_key()
        } else {
            let (code, expires) = server::initiate_pairing(&server);
            info!("pairing code: {code} (expires {expires})");
            let _ = tx.send(WorkerMsg::ShowPairingCode(code.clone()));

            let (name, key) = server::poll_claim(&server, &code);
            info!("paired as: {name}");
            key
        };

        // Try fetching live bundle. If server unreachable, fall back to
        // cached on-disk bundle and keep retrying every 30s in the background.
        let initial = match server::fetch_bundle(&server, &key) {
            Some(b) => {
                info!("bundle: {} cameras, {} layouts", b.cameras.len(), b.layouts.len());
                Some(b)
            }
            None => {
                if let Some(cached) = server::load_cached_bundle() {
                    warn!("offline mode: rendering cached bundle");
                    Some(cached)
                } else {
                    warn!("no bundle available (server unreachable, no cache)");
                    None
                }
            }
        };

        if let Some(bundle) = initial {
            let _ = tx.send(WorkerMsg::RenderBundle(bundle, server.clone(), key.clone()));
        }

        // Spawn WS client in a separate thread for live updates
        let server_ws = server.clone();
        let key_ws = key.clone();
        let (ws_tx, ws_rx) = mpsc::channel::<ServerMsg>();
        let tx_for_reload = tx.clone();
        let server_for_reload = server.clone();
        let key_for_reload = key.clone();

        std::thread::spawn(move || {
            ws_client::run(&server_ws, &key_ws, ws_tx);
        });

        // Background retry thread: if we couldn't fetch a live bundle on boot,
        // try again every 30s until we get one. Once fetched, send a render.
        let retry_tx = tx.clone();
        let retry_server = server.clone();
        let retry_key = key.clone();
        std::thread::spawn(move || {
            // Only loop while we have no live bundle yet — best-effort heuristic:
            // we attempt once, then sleep. If server unreachable each time we
            // keep waiting; once a fetch succeeds we push a fresh render.
            // After first success we exit; subsequent updates flow via WS.
            loop {
                std::thread::sleep(Duration::from_secs(30));
                if let Some(b) = server::fetch_bundle(&retry_server, &retry_key) {
                    info!("offline-retry: fresh bundle fetched, rendering");
                    let _ = retry_tx.send(WorkerMsg::RenderBundle(
                        b,
                        retry_server.clone(),
                        retry_key.clone(),
                    ));
                    return;
                }
            }
        });

        // Listen for WS messages and dispatch
        std::thread::spawn(move || {
            for msg in ws_rx {
                match msg {
                    ServerMsg::ReloadBundle => {
                        info!("reloading bundle");
                        match server::fetch_bundle(&server_for_reload, &key_for_reload) {
                            Some(bundle) => {
                                let _ = tx_for_reload.send(WorkerMsg::RenderBundle(
                                    bundle,
                                    server_for_reload.clone(),
                                    key_for_reload.clone(),
                                ));
                            }
                            None => warn!("reload-bundle: fetch failed, keeping current render"),
                        }
                    }
                    ServerMsg::Standby => cec::standby(),
                    ServerMsg::Wake => {
                        let _ = tx_for_reload.send(WorkerMsg::Wake);
                    }
                    ServerMsg::Fan(pwm) => { hwmon::set_fan(pwm); }
                    ServerMsg::SwitchLayout(id) => {
                        let _ = tx_for_reload.send(WorkerMsg::SwitchLayout(id));
                    }
                }
            }
        });

        // Heartbeat loop — reports display geometry + hwmon
        loop {
            std::thread::sleep(std::time::Duration::from_secs(60));
            let displays = query_displays();
            let hw = hwmon::read();
            server::heartbeat(&server, &key, &displays, &hw);
        }
    });

    // Poll channel from UI thread via timeout
    let window_clone = window.clone();
    gtk::glib::timeout_add_local(std::time::Duration::from_millis(100), move || {
        while let Ok(msg) = rx.try_recv() {
            match msg {
                WorkerMsg::ShowPairingCode(code) => show_pairing_code(&window_clone, &code),
                WorkerMsg::RenderBundle(bundle, server, key) => {
                    render_bundle(&window_clone, bundle, &server, &key);
                    install_idle_watchdog(&window_clone);
                }
                WorkerMsg::SwitchLayout(id) => {
                    render_layout(&window_clone, id);
                }
                WorkerMsg::Wake => {
                    cec::wake();
                    IS_ASLEEP.with(|c| c.set(false));
                    mark_activity();
                }
            }
        }
        gtk::glib::ControlFlow::Continue
    });
}

enum WorkerMsg {
    ShowPairingCode(String),
    RenderBundle(KioskBundle, String, String),
    SwitchLayout(u32),
    Wake,
}

/// Reset activity timer. If we were asleep, wake the display first.
fn mark_activity() {
    LAST_ACTIVITY.with(|t| *t.borrow_mut() = Instant::now());
    if IS_ASLEEP.with(|c| c.get()) {
        info!("activity while asleep → waking display");
        cec::wake();
        IS_ASLEEP.with(|c| c.set(false));
    }
}

/// Install the once-per-second watchdog that enforces idle/sleep timeouts.
/// Safe to call multiple times — installs at most once.
fn install_idle_watchdog(window: &ApplicationWindow) {
    if WATCHDOG_INSTALLED.with(|c| c.get()) { return; }
    WATCHDOG_INSTALLED.with(|c| c.set(true));
    let window = window.clone();
    gtk::glib::timeout_add_local(Duration::from_secs(1), move || {
        let elapsed = LAST_ACTIVITY.with(|t| t.borrow().elapsed());

        // Need the bundle to read display timeouts + default layout.
        let (idle_to, sleep_to, default_id) = CURRENT_BUNDLE.with(|b| {
            match b.borrow().as_ref() {
                Some(bundle) => (
                    bundle.display.idle_timeout_seconds as u64,
                    bundle.display.sleep_timeout_seconds as u64,
                    bundle.display.default_layout_id,
                ),
                None => (0, 0, None),
            }
        });

        // Idle revert: if elapsed >= idle timeout AND current layout is not
        // default AND current layout doesn't itself reset the idle timer.
        if idle_to > 0 && elapsed >= Duration::from_secs(idle_to) {
            let cur = CURRENT_LAYOUT_ID.with(|c| c.get());
            let cur_resets_idle = CURRENT_BUNDLE.with(|b| {
                let bundle = b.borrow();
                let Some(bundle) = bundle.as_ref() else { return false };
                let Some(cur_id) = cur else { return false };
                bundle.layouts.iter().find(|l| l.id == cur_id)
                    .map(|l| l.resets_idle_timer)
                    .unwrap_or(false)
            });
            if let (Some(cur_id), Some(def_id)) = (cur, default_id) {
                if cur_id != def_id && cur_resets_idle {
                    info!("idle timeout reached → reverting to default layout");
                    render_layout(&window, def_id);
                }
            }
        }

        // Sleep: fire CEC standby once, mark asleep.
        if sleep_to > 0
            && elapsed >= Duration::from_secs(sleep_to)
            && !IS_ASLEEP.with(|c| c.get())
        {
            info!("sleep timeout reached → CEC standby");
            cec::standby();
            IS_ASLEEP.with(|c| c.set(true));
        }

        gtk::glib::ControlFlow::Continue
    });
}

/// Query connected HDMI displays from sysfs. Returns (name, width, height).
/// Reads /sys/class/drm/*/status and /sys/class/drm/*/modes.
fn query_displays() -> Vec<(String, u32, u32)> {
    let mut out = Vec::new();
    let Ok(entries) = std::fs::read_dir("/sys/class/drm") else { return out };
    for entry in entries.flatten() {
        let name = entry.file_name().to_string_lossy().to_string();
        // Skip non-HDMI connectors and the "card" parents
        if !name.contains("-HDMI-") && !name.contains("-DP-") { continue; }
        let path = entry.path();
        let status = std::fs::read_to_string(path.join("status")).unwrap_or_default();
        if status.trim() != "connected" { continue; }
        let modes = std::fs::read_to_string(path.join("modes")).unwrap_or_default();
        // First line = preferred mode
        let mode = modes.lines().next().unwrap_or("");
        let parts: Vec<&str> = mode.split('x').collect();
        if parts.len() != 2 { continue; }
        let w: u32 = parts[0].parse().unwrap_or(0);
        let h: u32 = parts[1].trim().parse().unwrap_or(0);
        if w == 0 || h == 0 { continue; }
        // Strip "cardN-" prefix for cleaner name
        let clean_name = name.split_once('-').map(|(_, rest)| rest.to_string()).unwrap_or(name);
        out.push((clean_name, w, h));
    }
    out
}

fn show_pairing_code(window: &ApplicationWindow, code: &str) {
    let vbox = GtkBox::new(Orientation::Vertical, 20);
    vbox.set_valign(gtk::Align::Center);
    vbox.set_halign(gtk::Align::Center);
    vbox.set_vexpand(true);

    let title = logo_picture(BETTERFRAME_LOGO_SVG, 360, 88, "pairing-logo");

    let code_label = Label::new(Some(code));
    add_css(&code_label, ".code { font-size: 72px; color: #fff; font-weight: 700; letter-spacing: 12px; font-family: monospace; }");
    code_label.add_css_class("code");

    let hint = Label::new(Some("Enter this code in BetterFrame admin to pair"));
    add_css(&hint, ".hint { font-size: 14px; color: #666; }");
    hint.add_css_class("hint");

    vbox.append(&title);
    vbox.append(&code_label);
    vbox.append(&hint);
    window.set_child(Some(&vbox));
}

fn render_bundle(window: &ApplicationWindow, bundle: KioskBundle, server_url: &str, kiosk_key: &str) {
    // Cache the bundle + auth so layout-switch and idle-revert can re-render
    // without needing a full reload.
    CURRENT_BUNDLE.with(|b| *b.borrow_mut() = Some(bundle.clone()));
    CURRENT_AUTH.with(|a| *a.borrow_mut() = Some((server_url.to_string(), kiosk_key.to_string())));
    mark_activity();

    let target_layout_id = bundle.display.default_layout_id
        .or_else(|| bundle.layouts.iter().find(|l| l.is_default).map(|l| l.id));

    let Some(target_layout_id) = target_layout_id else {
        warn!("display has no default layout");
        clear_warm_cameras();
        CURRENT_LAYOUT_ID.with(|c| c.set(None));
        show_logo(window);
        return;
    };

    render_layout(window, target_layout_id);
}

/// Render a specific layout id from the cached bundle. If not found, fall back
/// to the display's default layout. If neither exists, show the logo.
fn render_layout(window: &ApplicationWindow, layout_id: u32) {
    mark_activity();

    // Snapshot what we need out of the cached bundle.
    let snapshot: Option<(KioskBundle, String, String)> = CURRENT_BUNDLE.with(|b| {
        let bundle = b.borrow();
        let bundle = bundle.as_ref()?.clone();
        let auth = CURRENT_AUTH.with(|a| a.borrow().clone());
        let (server_url, kiosk_key) = auth?;
        Some((bundle, server_url, kiosk_key))
    });
    let Some((bundle, server_url, kiosk_key)) = snapshot else {
        warn!("render_layout: no cached bundle yet");
        show_logo(window);
        return;
    };

    let layout = bundle.layouts.iter().find(|l| l.id == layout_id)
        .or_else(|| {
            warn!("render_layout: layout {layout_id} not found, falling back to default");
            bundle.display.default_layout_id
                .and_then(|did| bundle.layouts.iter().find(|l| l.id == did))
                .or_else(|| bundle.layouts.iter().find(|l| l.is_default))
        });

    let Some(layout) = layout else {
        warn!("render_layout: no usable layout");
        clear_warm_cameras();
        CURRENT_LAYOUT_ID.with(|c| c.set(None));
        show_logo(window);
        return;
    };

    if layout.cells.is_empty() {
        warn!("layout has no cells");
        clear_warm_cameras();
        CURRENT_LAYOUT_ID.with(|c| c.set(Some(layout.id)));
        show_logo(window);
        return;
    }

    CURRENT_LAYOUT_ID.with(|c| c.set(Some(layout.id)));

    info!("rendering layout '{}' (id {}) with {}x{} grid, {} cells",
        layout.name, layout.id, layout.grid_cols, layout.grid_rows, layout.cells.len());

    // Compute which cameras are needed: cells with content_type=camera + preload_camera_ids
    let mut needed: std::collections::HashSet<u32> = std::collections::HashSet::new();
    for cell in &layout.cells {
        if cell.content_type == "camera" {
            if let Some(id) = cell.camera_id { needed.insert(id); }
        }
    }
    for id in &layout.preload_camera_ids { needed.insert(*id); }

    // Stop pipelines for cameras no longer needed
    WARM_CAMERAS.with(|w| {
        let mut warm = w.borrow_mut();
        let stale: Vec<u32> = warm.keys().filter(|id| !needed.contains(id)).copied().collect();
        for id in stale {
            if let Some((pipe, _, _)) = warm.remove(&id) {
                info!("stopping pipeline for camera {id} (no longer needed)");
                pipeline::stop(&pipe);
            }
        }
    });

    let server_url = server_url.as_str();
    let kiosk_key = kiosk_key.as_str();

    let grid = Grid::new();
    grid.set_row_homogeneous(true);
    grid.set_column_homogeneous(true);
    grid.set_vexpand(true);
    grid.set_hexpand(true);

    let cam_map: std::collections::HashMap<u32, &crate::bundle::BundleCamera> =
        bundle.cameras.iter().map(|c| (c.id, c)).collect();

    // Total grid area for the heuristic
    let total_area = (layout.grid_cols.max(1) * layout.grid_rows.max(1)) as f32;

    // Ensure preloaded cameras have pipelines even if not visible (use sub for warmth)
    for cam_id in &layout.preload_camera_ids {
        if let Some(cam) = cam_map.get(cam_id) {
            ensure_warm(*cam_id, cam, None, 0.0);
        }
    }

    for cell in &layout.cells {
        let widget: gtk::Widget = match cell.content_type.as_str() {
            "camera" => {
                if let Some(cam_id) = cell.camera_id {
                    if let Some(cam) = cam_map.get(&cam_id) {
                        let area = (cell.col_span * cell.row_span) as f32 / total_area;
                        if let Some((paintable, badge)) = ensure_warm(cam_id, cam, cell.stream_selector.as_deref(), area) {
                            let picture = Picture::for_paintable(&paintable);
                            picture.set_content_fit(match cell.fit.as_str() {
                                "contain" => gtk::ContentFit::Contain,
                                "fill" => gtk::ContentFit::Fill,
                                _ => gtk::ContentFit::Cover,
                            });
                            picture.set_vexpand(true);
                            picture.set_hexpand(true);
                            // Wrap in Overlay so we can stack a stream-role badge on top
                            let overlay = gtk::Overlay::new();
                            overlay.set_child(Some(&picture));
                            overlay.set_vexpand(true);
                            overlay.set_hexpand(true);
                            if badge == 'M' || badge == 'S' {
                                let label = Label::new(Some(&badge.to_string()));
                                label.set_halign(gtk::Align::Start);
                                label.set_valign(gtk::Align::Start);
                                label.set_margin_start(4);
                                label.set_margin_top(4);
                                add_css(&label, "label { background: rgba(0,0,0,0.6); color: #fff; font-size: 11px; font-weight: 600; padding: 2px 6px; border-radius: 4px; min-width: 14px; }");
                                overlay.add_overlay(&label);
                            }
                            overlay.upcast()
                        } else {
                            placeholder(Some(&format!("{} (no stream)", cam.name)))
                        }
                    } else {
                        placeholder(Some("Unknown camera"))
                    }
                } else {
                    none_cell()
                }
            }
            "html" => {
                let html = cell.html_content.as_deref().unwrap_or("");
                if html.trim().is_empty() {
                    none_cell()
                } else {
                    let webview = webkit6::WebView::new();
                    webkit6::prelude::WebViewExt::load_html(&webview, html, None);
                    webview.set_vexpand(true);
                    webview.set_hexpand(true);
                    webview.upcast()
                }
            }
            "web" => {
                let url = cell.web_url.as_deref().unwrap_or("").trim();
                if url.is_empty() {
                    none_cell()
                } else {
                    let webview = webkit6::WebView::new();
                    load_webview_url(&webview, url, server_url, kiosk_key);
                    webview.set_vexpand(true);
                    webview.set_hexpand(true);
                    webview.upcast()
                }
            }
            "none" => none_cell(),
            _ => placeholder(Some("Unknown content")),
        };

        grid.attach(
            &widget,
            cell.col as i32,
            cell.row as i32,
            cell.col_span as i32,
            cell.row_span as i32,
        );
    }

    window.set_child(Some(&grid));
}

fn clear_warm_cameras() {
    WARM_CAMERAS.with(|w| {
        for (_, (pipe, _, _)) in w.borrow().iter() { pipeline::stop(pipe); }
        w.borrow_mut().clear();
    });
}

fn load_webview_url(webview: &webkit6::WebView, url: &str, server_url: &str, kiosk_key: &str) {
    if should_attach_kiosk_auth(url, server_url) {
        let request = webkit6::URIRequest::new(url);
        if let Some(headers) = request.http_headers() {
            headers.append("Authorization", &format!("Bearer {kiosk_key}"));
        }
        webkit6::prelude::WebViewExt::load_request(webview, &request);
        return;
    }

    webkit6::prelude::WebViewExt::load_uri(webview, url);
}

fn should_attach_kiosk_auth(url: &str, server_url: &str) -> bool {
    let Ok(target) = Url::parse(url) else { return false };
    let Ok(server) = Url::parse(server_url) else { return false };
    if target.scheme() != server.scheme()
        || target.host_str() != server.host_str()
        || target.port_or_known_default() != server.port_or_known_default()
    {
        return false;
    }

    let path = target.path();
    path.starts_with("/dash/") || path.starts_with("/in/kiosk/")
}

/// Returns (paintable, badge_char) for a camera, creating a warm pipeline if missing.
/// If cached pipeline's stream differs from what the cell needs (M↔S swap due
/// to layout change), tear down old and spin up new.
fn ensure_warm(
    cam_id: u32,
    cam: &crate::bundle::BundleCamera,
    selector: Option<&str>,
    area_fraction: f32,
) -> Option<(gtk::gdk::Paintable, char)> {
    let (uri, desired_badge) = cam.pick_stream(selector, area_fraction)?;

    // Check cached: if badge matches desired, reuse. Else swap.
    let cached = WARM_CAMERAS.with(|w| {
        w.borrow().get(&cam_id).map(|(p, paint, b)| (p.clone(), paint.clone(), *b))
    });
    if let Some((pipe, paintable, badge)) = cached {
        if badge == desired_badge {
            return Some((paintable, badge));
        }
        info!("camera {cam_id}: stream change {badge} → {desired_badge}, swapping");
        pipeline::stop(&pipe);
        WARM_CAMERAS.with(|w| { w.borrow_mut().remove(&cam_id); });
    }

    let (pipe, sink) = pipeline::create_camera_pipeline(&cam.name, &uri)?;
    let paintable = sink.property::<gtk::gdk::Paintable>("paintable");
    pipeline::play(&pipe);
    WARM_CAMERAS.with(|w| {
        w.borrow_mut().insert(cam_id, (pipe, paintable.clone(), desired_badge));
    });
    info!("warmed pipeline for camera {cam_id} (stream: {desired_badge})");
    Some((paintable, desired_badge))
}

fn show_logo(window: &ApplicationWindow) {
    let vbox = GtkBox::new(Orientation::Vertical, 0);
    vbox.set_valign(gtk::Align::Center);
    vbox.set_halign(gtk::Align::Center);
    vbox.set_vexpand(true);
    vbox.set_hexpand(true);
    vbox.append(&logo_picture(BETTERFRAME_LOGO_SVG, 480, 118, "idle-logo"));
    window.set_child(Some(&vbox));
}

fn none_cell() -> gtk::Widget {
    placeholder(None)
}

fn placeholder(text: Option<&str>) -> gtk::Widget {
    let vbox = GtkBox::new(Orientation::Vertical, 8);
    add_css(
        &vbox,
        ".bf-placeholder { background-color: #111; } .bf-placeholder-text { color: #666; font-size: 14px; }",
    );
    vbox.add_css_class("bf-placeholder");
    vbox.set_valign(gtk::Align::Center);
    vbox.set_halign(gtk::Align::Center);
    vbox.set_vexpand(true);
    vbox.set_hexpand(true);
    vbox.append(&logo_picture(BETTERFRAME_MARK_SVG, 56, 56, "cell-logo"));
    if let Some(text) = text {
        let label = Label::new(Some(text));
        label.add_css_class("bf-placeholder-text");
        vbox.append(&label);
    }
    vbox.upcast()
}

fn logo_picture(svg: &'static str, width: i32, height: i32, css_class: &str) -> gtk::Widget {
    let bytes = gtk::glib::Bytes::from_static(svg.as_bytes());
    match gtk::gdk::Texture::from_bytes(&bytes) {
        Ok(texture) => {
            let picture = Picture::for_paintable(&texture);
            picture.add_css_class(css_class);
            picture.set_content_fit(gtk::ContentFit::Contain);
            picture.set_can_shrink(true);
            picture.set_size_request(width, height);
            picture.set_valign(gtk::Align::Center);
            picture.set_halign(gtk::Align::Center);
            picture.upcast()
        }
        Err(err) => {
            warn!("failed to load embedded logo: {err}");
            let label = Label::new(Some("BetterFrame"));
            label.set_size_request(width, height);
            label.set_valign(gtk::Align::Center);
            label.set_halign(gtk::Align::Center);
            label.upcast()
        }
    }
}

fn add_css(widget: &impl IsA<gtk::Widget>, css: &str) {
    let provider = gtk::CssProvider::new();
    provider.load_from_string(css);
    gtk::style_context_add_provider_for_display(
        &widget.display(),
        &provider,
        gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
    );
}