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//! A button with a selection menu.

use crate::ui::{description_item, menu};
use gtk::{Cast, MenuButtonExt, PopoverExt, WidgetExt};
use relm::{
    create_component, Component, ContainerWidget, Relm, Update, Widget,
};
use uuid::Uuid;

/// A button widget with a selection menu.
pub struct W {
    relm: Relm<Self>,
    root: gtk::MenuButton,
    back_icon: gdk_pixbuf::Pixbuf,
    menu: Option<Component<menu::W>>,
    description: Component<description_item::W>,
}

/// Parameter of the widget.
pub struct Param {
    /// The menu that gets shown when the button is clicked.
    pub menu: Option<menu::TopMenu>,

    /// The icon of the button.
    pub description: description_item::Item,

    /// The back icon shown in nested menus.
    pub back_icon: gdk_pixbuf::Pixbuf,
}

/// Messages of the widget.
#[derive(Msg)]
pub enum Msg {
    /// Update the button with a new menu.
    UpdateMenu(Option<menu::TopMenu>),

    /// Update the menu button description.
    UpdateDescription(description_item::Item),

    #[doc(hidden)]
    ResetMenu(Intern),

    /// An item got activated.
    ItemActivated(Uuid, Intern),
}

impl Widget for W {
    type Root = gtk::MenuButton;

    fn root(&self) -> Self::Root {
        self.root.clone()
    }

    fn view(relm: &Relm<Self>, model: Self::Model) -> Self {
        let Param {
            menu,
            description,
            back_icon,
        } = model;

        let param = description_item::Param { item: description };
        let description = create_component::<description_item::W>(param);

        let root = gtk::MenuButtonBuilder::new()
            .child(description.widget().upcast_ref())
            .build();

        relm.stream().emit(Msg::UpdateMenu(menu));

        W {
            relm: relm.clone(),
            root,
            description,
            back_icon,
            menu: None,
        }
    }
}

impl Update for W {
    type Model = Param;
    type ModelParam = Param;
    type Msg = Msg;

    fn model(_relm: &Relm<Self>, details: Param) -> Self::Model {
        details
    }

    fn update(&mut self, e: Msg) {
        match e {
            Msg::UpdateMenu(menu) => {
                if let Some(menu) = menu {
                    self.menu = Some(self.root.enable_menu(
                        &self.relm,
                        self.back_icon.clone(),
                        menu,
                    ));
                } else {
                    self.root.disable_menu();
                    self.menu = None;
                }
            }
            Msg::UpdateDescription(item) => {
                self.description.emit(description_item::Msg::Update(item));
            }
            Msg::ResetMenu(_) => {
                if let Some(ref menu) = self.menu {
                    menu.emit(menu::Msg::Reset);
                }
            }
            Msg::ItemActivated(_, _) => {
                if let Some(popover) = self.root.get_popover() {
                    popover.popdown();
                }
            }
        }
    }
}

trait ManageMenu {
    fn set_menu(
        &self,
        relm: &Relm<W>,
        back_icon: gdk_pixbuf::Pixbuf,
        menu: Option<menu::TopMenu>,
    ) -> Option<Component<menu::W>> {
        match menu {
            Some(menu) => Some(self.enable_menu(relm, back_icon, menu)),
            None => {
                self.disable_menu();
                None
            }
        }
    }
    fn enable_menu(
        &self,
        relm: &Relm<W>,
        back_icon: gdk_pixbuf::Pixbuf,
        menu: menu::TopMenu,
    ) -> Component<menu::W>;
    fn disable_menu(&self);
}

impl ManageMenu for gtk::MenuButton {
    fn enable_menu(
        &self,
        relm: &Relm<W>,
        back_icon: gdk_pixbuf::Pixbuf,
        menu: menu::TopMenu,
    ) -> Component<menu::W> {
        self.set_visible(true);
        let param = menu::Param { menu, back_icon };

        let scroller = gtk::ScrolledWindowBuilder::new()
            .overlay_scrolling(false)
            .max_content_height(600)
            .propagate_natural_width(true)
            .propagate_natural_height(true)
            .build();
        let w = scroller.add_widget::<menu::W>(param);

        scroller.show_all();

        let popover = gtk::PopoverBuilder::new()
            .child(scroller.upcast_ref())
            .relative_to(self.upcast_ref())
            .constrain_to(gtk::PopoverConstraint::Window)
            .build();

        connect!(
            w@menu::Msg::ItemActivated(uuid, _),
            relm,
            Msg::ItemActivated(uuid, intern()));
        connect!(
            relm,
            popover,
            connect_closed(_),
            Msg::ResetMenu(intern())
        );

        self.set_popover(Some(&popover));

        w
    }

    fn disable_menu(&self) {
        self.set_visible(false);
        let o: Option<&gtk::Popover> = None;
        self.set_popover(o);
    }
}

#[doc(hidden)]
#[derive(Clone, Debug)]
struct InternFlag;

#[doc(hidden)]
#[derive(Clone, Debug)]
pub struct Intern {
    _flag: InternFlag,
}

#[doc(hidden)]
fn intern() -> Intern {
    Intern { _flag: InternFlag }
}