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use adw::subclass::prelude::*;
use gtk::{glib, glib::clone, prelude::*, CompositeTemplate};
use tracing::error;

mod user_session_row;

use self::user_session_row::UserSessionRow;
use crate::{
    session::model::{User, UserSession, UserSessionsList},
    utils::{BoundObject, LoadingState},
};

mod imp {
    use std::cell::RefCell;

    use glib::subclass::InitializingObject;

    use super::*;

    #[derive(Debug, Default, CompositeTemplate, glib::Properties)]
    #[template(
        resource = "/org/gnome/Fractal/ui/session/view/account_settings/user_sessions_page/mod.ui"
    )]
    #[properties(wrapper_type = super::UserSessionsPage)]
    pub struct UserSessionsPage {
        #[template_child]
        pub stack: TemplateChild<gtk::Stack>,
        #[template_child]
        pub current_session_group: TemplateChild<adw::PreferencesGroup>,
        #[template_child]
        pub current_session: TemplateChild<gtk::ListBox>,
        #[template_child]
        pub other_sessions_group: TemplateChild<adw::PreferencesGroup>,
        #[template_child]
        pub other_sessions: TemplateChild<gtk::ListBox>,
        /// The list of user sessions.
        #[property(get, set = Self::set_user_sessions, explicit_notify, nullable)]
        pub user_sessions: BoundObject<UserSessionsList>,
        other_sessions_handler: RefCell<Option<glib::SignalHandlerId>>,
    }

    #[glib::object_subclass]
    impl ObjectSubclass for UserSessionsPage {
        const NAME: &'static str = "UserSessionsPage";
        type Type = super::UserSessionsPage;
        type ParentType = adw::PreferencesPage;

        fn class_init(klass: &mut Self::Class) {
            Self::bind_template(klass);
            Self::Type::bind_template_callbacks(klass);
        }

        fn instance_init(obj: &InitializingObject<Self>) {
            obj.init_template();
        }
    }

    #[glib::derived_properties]
    impl ObjectImpl for UserSessionsPage {
        fn dispose(&self) {
            if let Some(user_sessions) = self.user_sessions.obj() {
                if let Some(handler) = self.other_sessions_handler.take() {
                    user_sessions.other_sessions().disconnect(handler);
                }
            }

            // AdwPreferencesPage doesn't handle children other than AdwPreferencesGroup.
            self.stack.unparent();
        }
    }

    impl WidgetImpl for UserSessionsPage {}
    impl PreferencesPageImpl for UserSessionsPage {}

    impl UserSessionsPage {
        /// Set the list of user sessions.
        fn set_user_sessions(&self, user_sessions: Option<UserSessionsList>) {
            let prev_user_sessions = self.user_sessions.obj();

            if prev_user_sessions == user_sessions {
                return;
            }

            if let Some(user_sessions) = prev_user_sessions {
                if let Some(handler) = self.other_sessions_handler.take() {
                    user_sessions.other_sessions().disconnect(handler);
                }
            }
            self.user_sessions.disconnect_signals();

            if let Some(user_sessions) = user_sessions {
                let other_sessions = user_sessions.other_sessions();

                self.other_sessions
                    .bind_model(Some(&other_sessions), |item| {
                        let Some(user_session) = item.downcast_ref::<UserSession>() else {
                            error!("Did not get a user session as an item of user session list");
                            return adw::Bin::new().upcast();
                        };

                        UserSessionRow::new(user_session).upcast()
                    });

                let other_sessions_handler = other_sessions.connect_items_changed(
                    clone!(@weak self as imp => move |other_sessions, _, _, _| {
                        imp.other_sessions_group.set_visible(other_sessions.n_items() > 0);
                    }),
                );
                self.other_sessions_handler
                    .replace(Some(other_sessions_handler));
                self.other_sessions_group
                    .set_visible(other_sessions.n_items() > 0);

                let loading_state_handler = user_sessions.connect_loading_state_notify(
                    clone!(@weak self as imp => move |_| {
                        imp.update_state();
                    }),
                );
                let is_empty_handler =
                    user_sessions.connect_is_empty_notify(clone!(@weak self as imp => move |_| {
                        imp.update_state();
                    }));
                let current_session_handler = user_sessions.connect_current_session_notify(
                    clone!(@weak self as imp => move |_| {
                        imp.update_current_session();
                    }),
                );

                self.user_sessions.set(
                    user_sessions,
                    vec![
                        loading_state_handler,
                        is_empty_handler,
                        current_session_handler,
                    ],
                );
            } else {
                self.other_sessions.unbind_model();
            }

            self.obj().notify_user_sessions();

            self.update_current_session();
            self.update_state();
        }

        /// Update the state of the UI according to the current state.
        fn update_state(&self) {
            let (is_empty, state) = self
                .user_sessions
                .obj()
                .map(|s| (s.is_empty(), s.loading_state()))
                .unwrap_or((true, LoadingState::Loading));

            let page = if is_empty {
                match state {
                    LoadingState::Error | LoadingState::Ready => "error",
                    _ => "loading",
                }
            } else {
                "list"
            };
            self.stack.set_visible_child_name(page);
        }

        /// Update the section about the current session.
        fn update_current_session(&self) {
            if let Some(child) = self.current_session.first_child() {
                self.current_session.remove(&child);
            }

            let current_session = self.user_sessions.obj().and_then(|s| s.current_session());
            let Some(current_session) = current_session else {
                self.current_session_group.set_visible(false);
                return;
            };

            self.current_session
                .append(&UserSessionRow::new(&current_session));
            self.current_session_group.set_visible(true);
        }
    }
}

glib::wrapper! {
    /// User sessions page.
    pub struct UserSessionsPage(ObjectSubclass<imp::UserSessionsPage>)
        @extends gtk::Widget, gtk::Window, adw::Window, adw::PreferencesWindow, @implements gtk::Accessible;
}

#[gtk::template_callbacks]
impl UserSessionsPage {
    pub fn new(user: &User) -> Self {
        glib::Object::builder().property("user", user).build()
    }

    /// Reload the user sessions list.
    #[template_callback]
    async fn reload_list(&self) {
        let Some(user_sessions) = self.user_sessions() else {
            return;
        };

        user_sessions.load().await;
    }
}