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#![doc = include_str!("channel.md")]

use crate::runner::Runner;
use crate::runner::{self, Task};
use async_channel as achannel;
use std::time::Duration;

pub const TASK_SIGNAL: u8 = 0;
pub const TASK_DONE: u8 = TASK_SIGNAL;

/// Create a [`runner::Runner`].
/// Signals every `interval`.
pub fn new(interval: Duration) -> (achannel::Receiver<u8>, Runner<Task>) {
    struct Test(achannel::Sender<u8>);
    impl runner::FnTask for Test {
        fn call(&self) {
            if let Err(e) = self.0.send_blocking(TASK_SIGNAL) {
                panic!("[task-controler] error sending start signal: {}", e);
            }
        }
    }

    let (sub_sender, main_receiver) = achannel::bounded::<u8>(1);

    let mut runner = runner::new_external_close_runner(interval);
    runner.set_task(runner::Task::TaskFn(Box::new(Test(sub_sender))));
    (main_receiver, runner)
}

/// Create a [`runner::Runner`].
/// Signals every `interval` and waits for [`TASK_DONE`] signal.
pub fn new_blocking(
    interval: Duration,
) -> (achannel::Sender<u8>, achannel::Receiver<u8>, Runner<Task>) {
    struct Test {
        s: achannel::Sender<u8>,
        r: achannel::Receiver<u8>,
    }
    impl runner::FnTask for Test {
        fn call(&self) {
            if let Err(e) = self.s.send_blocking(TASK_SIGNAL) {
                panic!("[task-controler] error sending start signal: {}", e);
            }
            if let Err(e) = self.r.recv_blocking() {
                panic!("[task-controler] error receiving done signal: {}", e)
            }
        }
    }

    let (sub_sender, main_receiver) = achannel::bounded::<u8>(1);
    let (main_sender, sub_receiver) = achannel::bounded::<u8>(1);

    let mut runner = runner::new_external_close_runner(interval);
    runner.set_task(runner::Task::new_fn_task(Test {
        s: sub_sender,
        r: sub_receiver,
    }));
    (main_sender, main_receiver, runner)
}