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//! A widget showing a boolean samplic parameter.

use gtk::{BoxExt, LabelExt, StyleContextExt, WidgetExt};
use ommui_data::samplic::{
    BooleanParameterDescription, ProfileParameterDescription,
};
use relm::{Relm, Update, Widget};
use std::marker::PhantomData;
use XTr;

/// The parameter passed to the model on creation.
#[derive(Debug)]
pub struct Param<TR: XTr> {
    /// The parameter value.
    pub value: bool,
    /// The description.
    pub description: BooleanParameterDescription,
    /// The profile description.
    pub profile: ProfileParameterDescription,
    /// The translation.
    pub translation: TR,
}

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

/// An incoming message.
#[derive(Debug)]
pub struct Incoming {
    /// The message.
    pub msg: IncomingMsg,
}

/// A message which can be sent to a W instance.
#[derive(Debug)]
pub enum IncomingMsg {
    /// Toggle the value.
    Toggle,
}

impl From<IncomingMsg> for Msg {
    fn from(msg: IncomingMsg) -> Msg {
        Msg::Incoming(Incoming { msg })
    }
}

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

/// A message which can be emitted by a W instance.
#[derive(Debug, Clone)]
pub enum OutgoingMsg {
    /// The value changed.
    ValueChanged(bool),
}

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

impl<TR: XTr> Update for W<TR> {
    type Model = Param<TR>;
    type ModelParam = Param<TR>;
    type Msg = Msg;

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

    fn update(&mut self, event: Msg) {
        use self::Msg::*;
        match event {
            Incoming(e) => self.update_incoming(e.msg),
            Outgoing(_) => {}
        }
    }
}

impl<TR: XTr> W<TR> {
    fn update_incoming(&mut self, e: IncomingMsg) {
        use self::IncomingMsg::*;
        match e {
            Toggle => {
                self.value = !self.value;
                self.update_value_caption();
                self.relm.stream().emit(Msg::from(
                    OutgoingMsg::ValueChanged(self.value),
                ));
            }
        }
    }

    fn update_value_caption(&mut self) {
        let value_caption = if self.value {
            &self.value_caption_true
        } else {
            &self.value_caption_false
        };
        self.label.set_text(value_caption);
    }
}

impl<TR: XTr> Widget for W<TR> {
    type Root = gtk::Box;

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

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

        let hbox = gtk::Box::new(gtk::Orientation::Horizontal, 3);

        let value_caption_true =
            translation.xtr(&description.value_caption_true);
        let value_caption_false =
            translation.xtr(&description.value_caption_false);

        let caption = translation.xtr(&description.caption);
        let caption = gtk::Label::new(Some(caption.as_str()));
        caption.get_style_context().add_class("caption");
        hbox.pack_start(&caption, false, false, 5);

        let label = {
            let value_caption = if value {
                &value_caption_true
            } else {
                &value_caption_false
            };
            gtk::Label::new(Some(value_caption.as_str()))
        };
        label.get_style_context().add_class("value");
        hbox.pack_end(&label, false, false, 5);

        Self {
            relm: relm.clone(),
            hbox,
            label,
            value,
            value_caption_true,
            value_caption_false,
            phantom: PhantomData,
        }
    }
}

/// The widget.
pub struct W<TR: XTr> {
    relm: Relm<W<TR>>,
    hbox: gtk::Box,
    label: gtk::Label,
    value: bool,
    value_caption_true: String,
    value_caption_false: String,
    phantom: PhantomData<TR>,
}