use gtk4::prelude::*;
use libadwaita::prelude::*;

use crate::window::FeedTheMonkeyWindow;

const APP_ID: &str = "net.jeena.FeedTheMonkey";

glib::wrapper! {
    pub struct FeedTheMonkeyApp(ObjectSubclass<imp::FeedTheMonkeyApp>)
        @extends libadwaita::Application, gtk4::Application, gio::Application,
        @implements gio::ActionGroup, gio::ActionMap;
}

impl FeedTheMonkeyApp {
    pub fn new() -> Self {
        glib::Object::builder()
            .property("application-id", APP_ID)
            .property("flags", gio::ApplicationFlags::empty())
            .build()
    }

    pub fn run(&self) -> glib::ExitCode {
        ApplicationExtManual::run(self)
    }
}

mod imp {
    use super::*;
    use libadwaita::subclass::prelude::*;

    #[derive(Default)]
    pub struct FeedTheMonkeyApp;

    #[glib::object_subclass]
    impl ObjectSubclass for FeedTheMonkeyApp {
        const NAME: &'static str = "FeedTheMonkeyApp";
        type Type = super::FeedTheMonkeyApp;
        type ParentType = libadwaita::Application;
    }

    impl ObjectImpl for FeedTheMonkeyApp {}

    impl ApplicationImpl for FeedTheMonkeyApp {
        fn activate(&self) {
            self.parent_activate();
            let app = self.obj();

            // Register GResource
            let resource_bytes = glib::Bytes::from_static(include_bytes!(env!("GRESOURCE_FILE")));
            let resource = gio::Resource::from_data(&resource_bytes)
                .expect("failed to load GResource");
            gio::resources_register(&resource);

            // Apply application-level CSS tweaks
            let css = gtk4::CssProvider::new();
            css.load_from_string(
                "paned > :first-child .top-bar headerbar {
                    background-color: @headerbar_bg_color;
                    box-shadow: none;
                }
                paned > :first-child > toolbarview > .content {
                    padding-top: 0;
                    margin-top: 0;
                }
                .sidebar-content row:not(:selected) {
                    background-color: alpha(@window_fg_color, 0.07);
                }
                .sidebar-content row:not(:selected):hover {
                    background-color: alpha(@window_fg_color, 0.14);
                }
                .sidebar-content row:selected {
                    background-color: alpha(@window_fg_color, 0.22);
                }"
            );
            gtk4::style_context_add_provider_for_display(
                &gtk4::gdk::Display::default().unwrap(),
                &css,
                gtk4::STYLE_PROVIDER_PRIORITY_APPLICATION,
            );

            let window = FeedTheMonkeyWindow::new(app.upcast_ref());

            // Shortcuts overlay
            let builder = gtk4::Builder::from_resource(
                "/net/jeena/FeedTheMonkey/ui/shortcuts.ui",
            );
            let overlay: gtk4::ShortcutsWindow = builder.object("help_overlay").unwrap();
            window.set_help_overlay(Some(&overlay));

            setup_shortcuts(&window);

            // About action on app
            let app_weak = app.downgrade();
            let about_action = gio::SimpleAction::new("about", None);
            about_action.connect_activate(move |_, _| {
                if let Some(app) = app_weak.upgrade() {
                    let win = app.active_window();
                    let dialog = libadwaita::AboutDialog::builder()
                        .application_name("FeedTheMonkey")
                        .application_icon("feedthemonkey")
                        .version("3.0.0")
                        .copyright("© Jeena Paradies")
                        .license_type(gtk4::License::Gpl30)
                        .website("https://git.jeena.net/jeena/FeedTheMonkey")
                        .developer_name("Jeena Paradies")
                        .build();
                    dialog.present(win.as_ref().map(|w| w.upcast_ref::<gtk4::Widget>()));
                }
            });
            app.add_action(&about_action);

            // Quit action
            let app_weak = app.downgrade();
            let quit_action = gio::SimpleAction::new("quit", None);
            quit_action.connect_activate(move |_, _| {
                if let Some(app) = app_weak.upgrade() {
                    app.quit();
                }
            });
            app.add_action(&quit_action);

            window.present();
        }
    }

    impl GtkApplicationImpl for FeedTheMonkeyApp {}
    impl AdwApplicationImpl for FeedTheMonkeyApp {}
}

fn setup_shortcuts(window: &FeedTheMonkeyWindow) {
    use gtk4::gdk::{Key, ModifierType};

    let controller = gtk4::ShortcutController::new();
    controller.set_scope(gtk4::ShortcutScope::Global);

    let add = |controller: &gtk4::ShortcutController,
               key: Key,
               mods: ModifierType,
               action_name: &str| {
        let trigger = gtk4::KeyvalTrigger::new(key, mods);
        let action = gtk4::NamedAction::new(action_name);
        let shortcut = gtk4::Shortcut::new(Some(trigger), Some(action));
        controller.add_shortcut(shortcut);
    };

    // j/k/Left/Right are handled by a capture-phase key controller in window.rs
    // so they work regardless of which widget has focus.
    add(&controller, Key::r,      ModifierType::empty(),       "win.reload");
    add(&controller, Key::u,      ModifierType::empty(),       "win.mark-unread");
    add(&controller, Key::Return, ModifierType::empty(),       "win.open-in-browser");
    add(&controller, Key::n,      ModifierType::empty(),       "win.open-in-browser");
    add(&controller, Key::plus,   ModifierType::CONTROL_MASK,  "win.zoom-in");
    add(&controller, Key::equal,  ModifierType::CONTROL_MASK,  "win.zoom-in");
    add(&controller, Key::minus,  ModifierType::CONTROL_MASK,  "win.zoom-out");
    add(&controller, Key::_0,     ModifierType::CONTROL_MASK,  "win.zoom-reset");
    add(&controller, Key::F9,     ModifierType::empty(),       "win.toggle-sidebar");
    add(&controller, Key::F11,    ModifierType::empty(),       "win.toggle-fullscreen");
    add(&controller, Key::w,      ModifierType::CONTROL_MASK,  "window.close");
    add(&controller, Key::q,      ModifierType::CONTROL_MASK,  "app.quit");
    add(&controller, Key::F1,     ModifierType::empty(),       "win.show-help-overlay");

    window.add_controller(controller);
}