use adw::subclass::prelude::*;
use gettextrs::gettext;
use gtk::{glib, glib::clone, prelude::*, CompositeTemplate};

use crate::{
    components::LoadingButton, gettext_f, prelude::*, session::model::IdentityVerification, toast,
};

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

    use glib::subclass::InitializingObject;

    use super::*;

    #[derive(Debug, Default, CompositeTemplate, glib::Properties)]
    #[template(
        resource = "/org/gnome/Fractal/ui/identity_verification_view/confirm_qr_code_page.ui"
    )]
    #[properties(wrapper_type = super::ConfirmQrCodePage)]
    pub struct ConfirmQrCodePage {
        /// The current identity verification.
        #[property(get, set = Self::set_verification, explicit_notify, nullable)]
        pub verification: glib::WeakRef<IdentityVerification>,
        pub display_name_handler: RefCell<Option<glib::SignalHandlerId>>,
        #[template_child]
        pub question: TemplateChild<gtk::Label>,
        #[template_child]
        pub confirm_btn: TemplateChild<LoadingButton>,
        #[template_child]
        pub cancel_btn: TemplateChild<LoadingButton>,
    }

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

        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 ConfirmQrCodePage {
        fn dispose(&self) {
            if let Some(verification) = self.verification.upgrade() {
                if let Some(handler) = self.display_name_handler.take() {
                    verification.user().disconnect(handler);
                }
            }
        }
    }

    impl WidgetImpl for ConfirmQrCodePage {
        fn grab_focus(&self) -> bool {
            self.confirm_btn.grab_focus()
        }
    }

    impl BinImpl for ConfirmQrCodePage {}

    impl ConfirmQrCodePage {
        /// Set the current identity verification.
        fn set_verification(&self, verification: Option<IdentityVerification>) {
            let prev_verification = self.verification.upgrade();

            if prev_verification == verification {
                return;
            }
            let obj = self.obj();

            obj.reset();

            if let Some(verification) = prev_verification {
                if let Some(handler) = self.display_name_handler.take() {
                    verification.user().disconnect(handler);
                }
            }

            if let Some(verification) = &verification {
                let display_name_handler = verification.user().connect_display_name_notify(clone!(
                    #[weak]
                    obj,
                    move |_| {
                        obj.update_labels();
                    }
                ));
                self.display_name_handler
                    .replace(Some(display_name_handler));
            }

            self.verification.set(verification.as_ref());

            obj.update_labels();
            obj.notify_verification();
        }
    }
}

glib::wrapper! {
    /// A page to confirm whether the QR Code was scanned successfully by the other party.
    pub struct ConfirmQrCodePage(ObjectSubclass<imp::ConfirmQrCodePage>)
        @extends gtk::Widget, adw::Bin, @implements gtk::Accessible;
}

#[gtk::template_callbacks]
impl ConfirmQrCodePage {
    pub fn new() -> Self {
        glib::Object::new()
    }

    /// Update the labels for the current verification.
    fn update_labels(&self) {
        let Some(verification) = self.verification() else {
            return;
        };
        let imp = self.imp();

        if verification.is_self_verification() {
            imp.question
                .set_label(&gettext("Does the other session show a confirmation?"));
        } else {
            let name = verification.user().display_name();
            imp.question.set_markup(&gettext_f(
                // Translators: Do NOT translate the content between '{' and '}', this is a
                // variable name.
                "Does {user} see a confirmation on their session?",
                &[("user", &format!("<b>{name}</b>"))],
            ));
        }
    }

    /// Reset the UI to its initial state.
    pub fn reset(&self) {
        let imp = self.imp();

        imp.confirm_btn.set_is_loading(false);
        imp.cancel_btn.set_is_loading(false);
        self.set_sensitive(true);
    }

    /// Confirm that the QR Code was successfully scanned.
    #[template_callback]
    async fn confirm_scanned(&self) {
        let Some(verification) = self.verification() else {
            return;
        };

        self.imp().confirm_btn.set_is_loading(true);
        self.set_sensitive(false);

        if verification.confirm_qr_code_scanned().await.is_err() {
            toast!(self, gettext("Could not confirm the scan of the QR Code"));
            self.reset();
        }
    }

    /// Cancel the verification.
    #[template_callback]
    async fn cancel(&self) {
        let Some(verification) = self.verification() else {
            return;
        };

        self.imp().cancel_btn.set_is_loading(true);
        self.set_sensitive(false);

        if verification.cancel().await.is_err() {
            toast!(self, gettext("Could not cancel the verification"));
            self.reset();
        }
    }
}