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//! A widget for editing text.

use gtk::{ButtonExt, ContainerExt, EntryExt, PopoverExt, WidgetExt};
use relm::{Relm, Update, Widget};
use tr;

/// The parameter passed to the model on creation.
#[derive(Debug)]
pub struct Param {
    /// The value.
    pub value: String,
}

/// Message 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 {
    Popup,
    Ok,
}

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 {
    /// Value changed.
    ValueChanged(String),
}

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 {
            Popup => {
                self.entry.set_text(
                    self.root
                        .get_label()
                        .unwrap_or_else(|| glib::GString::from(""))
                        .as_ref(),
                );
                self.popover.popup()
            }
            Ok => {
                let value = self
                    .entry
                    .get_text()
                    .unwrap_or_else(|| glib::GString::from(""));
                self.root.set_label(&value);
                self.popover.popdown();
                self.relm.stream().emit(Msg::from(
                    OutgoingMsg::ValueChanged(value.to_string()),
                ));
            }
        }
    }
}

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

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

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

        let root = gtk::Button::new_with_label(value.as_str());

        connect!(
            relm,
            root,
            connect_clicked(_),
            Msg::from(InternalMsg::Popup)
        );

        let popover = gtk::Popover::new(Some(&root));
        let entry = gtk::Entry::new();
        {
            let vbox = gtk::Box::new(gtk::Orientation::Vertical, 0);

            entry.set_text(&value);

            let button = gtk::Button::new_with_label(&tr("Ok"));

            connect!(
                relm,
                button,
                connect_clicked(_),
                Msg::from(InternalMsg::Ok)
            );

            vbox.add(&entry);
            vbox.add(&button);

            popover.add(&vbox);
            vbox.show_all();
        }

        W {
            relm: relm.clone(),
            root,
            entry,
            popover,
        }
    }
}

/// The widget.
pub struct W {
    relm: Relm<W>,
    root: gtk::Button,
    entry: gtk::Entry,
    popover: gtk::Popover,
}