cargo-embed 0.9.1

use std::sync::mpsc;
use std::sync::{atomic::AtomicBool, Arc};
use std::thread;
use std::time::Duration;

use crossterm::event::{self, Event as CEvent, KeyEvent};

pub enum Event<I> {
    Input(I),
    Tick,
}

/// A small event handler that wrap termion input and tick events. Each event
/// type is handled in its own thread and returned to a common `Receiver`
pub struct Events {
    rx: mpsc::Receiver<Event<KeyEvent>>,
    _input_handle: thread::JoinHandle<()>,
    _ignore_exit_key: Arc<AtomicBool>,
    _tick_handle: thread::JoinHandle<()>,
}

#[derive(Debug, Clone, Copy)]
pub struct Config {
    pub tick_rate: Duration,
}

impl Default for Config {
    fn default() -> Config {
        Config {
            tick_rate: Duration::from_millis(250),
        }
    }
}

impl Events {
    pub fn new() -> Events {
        Events::with_config(Config::default())
    }

    pub fn with_config(config: Config) -> Events {
        let (tx, rx) = mpsc::channel();
        let ignore_exit_key = Arc::new(AtomicBool::new(false));
        let input_handle = {
            let tx = tx.clone();
            thread::spawn(move || {
                loop {
                    // poll for tick rate duration, if no events, sent tick event.
                    if event::poll(std::time::Duration::from_millis(10)).unwrap() {
                        if let CEvent::Key(key) = event::read().unwrap() {
                            if tx.send(Event::Input(key)).is_err() {
                                return;
                            }
                        }
                    }
                }
            })
        };
        let tick_handle = {
            thread::spawn(move || {
                let tx = tx.clone();
                loop {
                    tx.send(Event::Tick).unwrap();
                    thread::sleep(config.tick_rate);
                }
            })
        };
        Events {
            rx,
            _ignore_exit_key: ignore_exit_key,
            _input_handle: input_handle,
            _tick_handle: tick_handle,
        }
    }

    pub fn next(&self) -> Result<Event<KeyEvent>, mpsc::RecvError> {
        self.rx.recv()
    }
}