/*
 * OrbTK - The Orbital Widget Toolkit
 *
 * Copyright 2021 Ralf Zerres <ralf.zerres@networkx.de>
 * SPDX-License-Identifier: (0BSD or MIT)
 */

use orbtk::prelude::*;

/// Enumeration of valid `action variants` that need to be handled as
/// state changes for the `SenderView` widget.
#[derive(Clone, Debug)]
pub enum SenderAction {
    UpdateProgress(f64),
}

/// Valid `structure members` of the `SenderState` used to react on
/// state changes inside the `SenderView` widget.
#[derive(AsAny, Default)]
pub struct SenderState {
    // actions
    actions: Vec<SenderAction>,
    // entity that will receive the message
    target: Entity
}

/// Method definitions, we provide inside the `SenderState`.
impl SenderState {
    /// Sending message 'UpdateProgress'
    pub fn send_message(&mut self) {
        println!("Sender: push 'UpdateProgress' action");
        self.actions.push(SenderAction::UpdateProgress(0.1));
    }
}

/// Trait methods provided for the `SenderState`
impl State for SenderState {
    // initialize the view entities
    fn init(&mut self, _registry: &mut Registry, ctx: &mut Context) {
        // create the target entity, that receives the Sender messages
        self.target = Entity::from(ctx.widget().try_clone::<u32>("target")
            .expect("ERROR: SenderState::init(): target entity not found!"));
    }

    // update entities, before we render the view
    fn update(&mut self, _: &mut Registry, ctx: &mut Context) {
        let actions: Vec<SenderAction> = self.actions.drain(..).collect();

        for action in actions {
            match action {
                SenderAction::UpdateProgress(amount) => {
                    ctx.send_message(SenderAction::UpdateProgress(amount), self.target);
                    println!("Sender: send message 'SenderAction::UpdateProgress'");
                }
            }
        }
    }
}