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//! A widget showing an expander with a submenu.

use gtk::{ExpanderExt, StyleContextExt, WidgetExt};
use indexmap::IndexMap;
use relm::{Component, ContainerWidget, Relm, Update, Widget};
use uuid::Uuid;
use {description_item, menu_item, menu_listbox};

/// The parameter passed to the widget on creation.
#[derive(Debug, Clone)]
pub struct Param {
    /// The expander label item
    pub item: description_item::Item,
    /// The submenu items
    pub children: IndexMap<Uuid, menu_item::Item>,
}

/// Messages for updating the widget.
#[derive(Msg, Debug)]
pub enum Msg {
    /// Internal message
    Internal(Internal),
    /// Outgoing message
    Outgoing(Outgoing),
}

/// Internal message.
#[derive(Debug)]
pub struct Internal {
    msg: InternalMsg,
}

#[derive(Debug)]
enum InternalMsg {
    /// A submenu item got activated.
    FromChildren(menu_listbox::OutgoingMsg),
}

impl From<InternalMsg> for Msg {
    fn from(msg: InternalMsg) -> Msg {
        Msg::Internal(Internal { msg })
    }
}

/// Outgoing message.
#[derive(Debug)]
pub struct Outgoing {
    /// The message.
    pub msg: OutgoingMsg,
}

/// Outgoing message.
#[derive(Debug, Clone)]
pub enum OutgoingMsg {
    /// An item was selected.
    ItemActivated(Uuid),
}

impl From<OutgoingMsg> for Msg {
    fn from(msg: OutgoingMsg) -> Msg {
        Msg::Outgoing(Outgoing { msg })
    }
}

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, msg: Msg) {
        use self::Msg::*;
        match msg {
            Internal(msg) => self.update_internal(msg.msg),
            Outgoing(_) => {}
        }
    }
}

impl W {
    fn update_internal(&mut self, msg: InternalMsg) {
        use self::InternalMsg::*;
        match msg {
            FromChildren(msg) => {
                use menu_listbox::OutgoingMsg::*;
                match msg {
                    ItemActivated(uuid) => {
                        self.root.set_expanded(false);
                        self.relm.stream().emit(Msg::from(
                            OutgoingMsg::ItemActivated(uuid),
                        ));
                    }
                }
            }
        }
    }
}

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

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

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

        let root = gtk::Expander::new(None);

        let label = relm::create_component::<description_item::W>(
            description_item::Param { item },
        );
        root.set_label_widget(Some(label.widget()));
        let children =
            root.add_widget::<menu_listbox::W>(menu_listbox::Param {
                items: children,
            });
        connect!(
            children@menu_listbox::Msg::Outgoing(ref msg),
            relm,
            Msg::from(InternalMsg::FromChildren(msg.msg.clone())));

        children.widget().get_style_context().add_class("indented");

        W {
            root,
            relm: relm.clone(),
            _label: label,
            _children: children,
        }
    }
}

/// The widget.
pub struct W {
    root: gtk::Expander,
    relm: Relm<Self>,
    _label: Component<description_item::W>,
    _children: Component<menu_listbox::W>,
}