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/*
 * Copyright (c) 2017 Boucher, Antoni <bouanto@zoho.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

use std::sync::{Arc, Mutex};

use super::{EventStream, Receiver, Widget};

#[derive(Clone)]
pub struct Comp<WIDGET: Widget> {
    pub model: Arc<Mutex<WIDGET::Model>>,
    pub _receiver: Arc<Receiver>,
    pub stream: EventStream<WIDGET::Msg>,
    pub widget: WIDGET,
}

impl<WIDGET: Widget> Drop for Comp<WIDGET> {
    fn drop(&mut self) {
        let _ = self.stream.close();
    }
}

/// Widget that was added by the `ContainerWidget::add_widget()` method.
///
/// ## Warning
/// You must keep your components as long as you want them to send/receive events.
/// Common practice is to store `Component`s in the `Widget` struct (see the [communication
/// example](https://github.com/antoyo/relm/blob/master/examples/communication.rs#L182-L188)).
/// The `#[widget]` attribute takes care of storing them in the struct automatically (see the
/// [communication-attribute example](https://github.com/antoyo/relm/blob/master/examples/communication-attribute.rs)).
#[must_use]
#[derive(Clone)]
pub struct Component<WIDGET: Widget>(Comp<WIDGET>)
    where WIDGET::Model: Clone;

impl<WIDGET: Widget> Component<WIDGET>
    where WIDGET::Model: Clone
{
    #[doc(hidden)]
    pub fn new(component: Comp<WIDGET>) -> Self {
        Component(component)
    }
}

impl<WIDGET: Widget> Component<WIDGET>
    where WIDGET::Model: Clone
{
    /// Get the event stream of the widget.
    /// This is used internally by the library.
    pub fn stream(&self) -> &EventStream<WIDGET::Msg> {
        &self.0.stream
    }

    /// Get the widget of this component.
    pub fn widget(&self) -> &WIDGET {
        &self.0.widget
    }
}