use anyhow::Result;
use delay_timer::prelude::*;
use smol::Timer;
use std::time::Duration;

fn main() -> Result<()> {
    // Build an DelayTimer that uses the default configuration of the `smol` runtime internally.
    let delay_timer = DelayTimerBuilder::default().build();

    // Develop a print job that runs in an asynchronous cycle.
    // A chain of task instances.
    let task_instance_chain = delay_timer.insert_task(build_task_async_print()?)?;

    // Get the running instance of task 1.
    let task_instance = task_instance_chain.next_with_wait()?;

    // Cancel running task instances.
    task_instance.cancel_with_wait()?;

    // Remove task which id is 1.
    delay_timer.remove_task(1)?;

    // No new tasks are accepted; running tasks are not affected.
    delay_timer.stop_delay_timer()?;

    Ok(())
}

fn build_task_async_print() -> Result<Task, TaskError> {
    let mut task_builder = TaskBuilder::default();

    let body = || async {
        println!("create_async_fn_body!");

        Timer::after(Duration::from_secs(3)).await;

        println!("create_async_fn_body:i'success");
    };

    task_builder
        .set_task_id(1)
        .set_frequency_repeated_by_seconds(1)
        .set_maximum_parallel_runnable_num(2)
        .spawn_async_routine(body)
}