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#![no_std]
use core::future::Future;
use js::*;

pub type Handle = f64;

pub fn set_timeout(
    callback: impl FnMut() -> () + Send + 'static,
    milliseconds: impl Into<f64>,
) -> (Handle, JSFunction) {
    let cb = create_callback_0(callback);
    let handle = js!("function(handler,time){
        window.setTimeout(this.createCallback(handler),time);
    }")
    .invoke_2(cb, milliseconds);
    (handle, cb.into())
}

pub fn sleep(milliseconds: impl Into<f64>) -> impl Future {
    let (future, cb) = create_callback_future_0();
    js!("function(handler,time){
        window.setTimeout(this.createCallback(handler),time);
    }")
    .invoke_2(cb, milliseconds);
    future
}

pub fn set_interval(
    callback: impl FnMut() -> () + Send + 'static,
    milliseconds: impl Into<f64>,
) -> (Handle, JSFunction) {
    let cb = create_callback_0(callback);
    let handle = js!("function(handler,time){
        window.setInterval(this.createCallback(handler),time);
    }")
    .invoke_2(cb, milliseconds);
    (handle, cb.into())
}

pub fn request_animation_frame(callback: impl FnMut() -> () + Send + 'static) -> JSFunction {
    let cb = create_callback_0(callback);
    js!("function(handler){
        window.requestAnimationFrame(this.createCallback(handler));
    }")
    .invoke_1(cb);
    cb.into()
}

pub fn request_animation_loop(callback: impl FnMut(f64) -> () + Send + 'static) -> JSFunction {
    let cb = create_callback_1(callback);
    js!("function(cb){
        cb = this.createCallback(cb);
        let time = Date.now();
        function run(){
            let new_time = Date.now();
            let delta = new_time-time;
            time = new_time;
            window.requestAnimationFrame(run);
            cb(delta);
        }
        window.requestAnimationFrame(run);
    }")
    .invoke_1(cb);
    cb.into()
}

pub fn clear_timeout(handle: Handle) {
    js!("function(handle){
        window.clearTimeout(handle);
    }")
    .invoke_1(handle);
}

pub fn clear_interval(handle: Handle) {
    js!("function(handle){
        window.clearInterval(handle);
    }")
    .invoke_1(handle);
}