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//! A widget showing a list of descriptions.

use description_item;
use gtk::{ListBoxExt, ListBoxRowExt};
use indexmap::IndexMap;
use relm::{Component, ContainerWidget, Relm, Update, Widget};
use uuid::Uuid;

/// The param passed to the widget on creation.
#[derive(Debug, Clone)]
pub struct Param {
    /// The items shown in the model.
    pub items: IndexMap<Uuid, description_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 row of the view got activated.
    RowActivated(usize),
}

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

impl W {
    fn update_internal(&mut self, e: InternalMsg) {
        use self::InternalMsg::*;
        match e {
            RowActivated(index) => {
                let uuid = self.items.get_index(index).unwrap().0;

                println!("Selected uuid {:?}", uuid);
                self.relm
                    .stream()
                    .emit(Msg::from(OutgoingMsg::ItemActivated(*uuid)));
            }
        }
    }
}

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

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

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

        let root = gtk::ListBox::new();

        let items = items
            .into_iter()
            .map(|(uuid, item)| {
                (
                    uuid,
                    root.add_widget::<description_item::W>(
                        description_item::Param { item },
                    ),
                )
            })
            .collect();

        connect!(
            relm,
            root,
            connect_row_activated(_, row),
            Msg::from(InternalMsg::RowActivated(row.get_index() as usize))
        );

        W {
            relm: relm.clone(),
            root,
            items,
        }
    }
}

/// The widget.
pub struct W {
    relm: Relm<W>,
    root: gtk::ListBox,
    items: IndexMap<Uuid, Component<description_item::W>>,
}