import { Fn, isObject } from '../type'

type Timing = (n: number, c?: number, d?: number, x?: number, y?: number) => number

type TimingObject = {
  fn: (duration: number) => Timing
}

interface AnimateOptions {
  duration: number
  draw: (n: number) => void
  timing: Timing | TimingObject
  lapse?: number
  end?: Fn
}

export function animate({ duration, draw, timing, lapse, end }: AnimateOptions): Promise<void> {
  return new Promise(resolve => {
    if (isObject(timing)) {
      timing = (timing as any).fn(duration)
    }
    let start = Date.now()
    let progress = 0
    requestAnimationFrame(function anim(time) {
      let timeFraction = (time - start) / duration
      if (timeFraction > 1) timeFraction = 1
      progress = (timing as Timing)(timeFraction, time - start, duration)
      draw(progress)
      if (timeFraction < 1) {
        requestAnimationFrame(anim, lapse)
      } else {
        end && end()
        resolve()
      }
    })
  })
}

function requestAnimationFrame(f: (...args: any[]) => any, lapse = 0) {
  setTimeout(() => f(Date.now()), lapse)
}

export namespace easing {

  function makeEaseOut(timing: Timing) {
    return function(timeFraction: any) {
      return 1 - timing(1 - timeFraction)
    }
  }

  function bounceFn(timeFraction: number) {
    for (let a = 0, b = 1, result; 1; a += b, b /= 2) {
      if (timeFraction >= (7 - 4 * a) / 11) {
        return -Math.pow((11 - 6 * a - 11 * timeFraction) / 4, 2) + Math.pow(b, 2)
      }
    }
  }

  /** 
   * Imagine we are dropping a ball. It falls down, then bounces back a few times and stops. The bounce function does the same, but in the reverse order: “bouncing” starts immediately. 
   * */
  export const bounceEasyOut: () => Timing = () => makeEaseOut(bounceFn as any)

  /** 
   * parabolic curve 
   */
  export function quad(timeFraction: number) {
    return Math.pow(timeFraction, 2)
  }

  /**
   * “bow shooting”. First we “pull the bowstring”, and then “shoot”.
   * @param x “elasticity coefficient”. The distance of “bowstring pulling” is defined by it. Default value 1.5.
   */
  export const back = (x = 1.5) => (timeFraction: number) => Math.pow(timeFraction, 2) * ((x + 1) * timeFraction - x)
  /**
   * @param x “initial range”
   */
  export const elastic = (x = 1.5) => (timeFraction: number) =>
    Math.pow(2, 10 * (timeFraction - 1)) * Math.cos(((20 * Math.PI * x) / 3) * timeFraction)

  function makeEaseInOut(timing: Timing) {
    return function(timeFraction: number) {
      if (timeFraction < 0.5) return timing(2 * timeFraction) / 2
      else return (2 - timing(2 * (1 - timeFraction))) / 2
    }
  }

  export const bounceEaseInOut: () => Timing = () => makeEaseInOut(bounceFn as any)

  let c = 1
  let b = 0

  export const easeInQuad: () => Timing = () => ({ fn: (d: number) => (x: number, t: number) => c * (t /= d) * t + b } as any)

  export const easeOutQuad: () => Timing = () => ({ fn: (d: number) => (x: number, t: number) => -c * (t /= d) * (t - 2) + b } as any)

  export const easeInOutQuad: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if ((t /= d / 2) < 1) return (c / 2) * t * t + b
        return (-c / 2) * (--t * (t - 2) - 1) + b
      }
    } as any)

  export const easeInElastic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        let s = 1.70158
        let p = 0
        let a = c
        if (t == 0) return b
        if ((t /= d) == 1) return b + c
        if (!p) p = d * 0.3
        if (a < Math.abs(c)) {
          a = c
          let s = p / 4
        } else { s = (p / (2 * Math.PI)) * Math.asin(c / a) }
        return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p)) + b
      }
    } as any)

  export const easeOutBounce: () => TimingObject = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if ((t /= d) < 1 / 2.75) {
          return c * (7.5625 * t * t) + b
        } else if (t < 2 / 2.75) {
          return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b
        } else if (t < 2.5 / 2.75) {
          return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b
        } else {
          return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b
        }
      }
    } as any)

  export const easeInCubic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return c * (t /= d) * t * t + b
      }
    } as any)

  export const easeOutCubic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return c * ((t = t / d - 1) * t * t + 1) + b
      }
    } as any)

  export const easeInOutCubic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if ((t /= d / 2) < 1) return (c / 2) * t * t * t + b
        return (c / 2) * ((t -= 2) * t * t + 2) + b
      }
    } as any)

  export const easeInQuart: Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return c * (t /= d) * t * t * t + b
      }
    } as any)

  export const easeInOutQuart: Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t + b
        return (-c / 2) * ((t -= 2) * t * t * t - 2) + b
      }
    } as any)

  export const easeInQuint: Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return c * (t /= d) * t * t * t * t + b
      }
    } as any)

  export const easeOutQuint: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return c * ((t = t / d - 1) * t * t * t * t + 1) + b
      }
    } as any)

  export const easeInExpo: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return t == 0 ? b : c * Math.pow(2, 10 * (t / d - 1)) + b
      }
    } as any)

  export const easeInOutQuint: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if ((t /= d / 2) < 1) return (c / 2) * t * t * t * t * t + b
        return (c / 2) * ((t -= 2) * t * t * t * t + 2) + b
      }
    } as any)

  export const easeInSine: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        return -c * Math.cos((t / d) * (Math.PI / 2)) + c + b
      }
    } as any)

  export const easeInOutElastic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        let s = 1.70158
        let p = 0
        let a = c
        if (t == 0) return b
        if ((t /= d / 2) == 2) return b + c
        if (!p) p = d * (0.3 * 1.5)
        if (a < Math.abs(c)) {
          a = c
          let s = p / 4
        } else { s = (p / (2 * Math.PI)) * Math.asin(c / a) }
        if (t < 1) return -0.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p)) + b
        return a * Math.pow(2, -10 * (t -= 1)) * Math.sin(((t * d - s) * (2 * Math.PI)) / p) * 0.5 + c + b
      }
    } as any)

  export const easeOutElastic: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        let s = 1.70158
        let p = 0
        let a = c
        if (t == 0) return b
        if ((t /= d) == 1) return b + c
        if (!p) p = d * 0.3
        if (a < Math.abs(c)) {
          a = c
          let s = p / 4
        } else { s = (p / (2 * Math.PI)) * Math.asin(c / a) }
        return a * Math.pow(2, -10 * t) * Math.sin(((t * d - s) * (2 * Math.PI)) / p) + c + b
      }
    } as any)

  export const easeInOutExpo: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        if (t == 0) return b
        if (t == d) return b + c
        if ((t /= d / 2) < 1) return (c / 2) * Math.pow(2, 10 * (t - 1)) + b
        return (c / 2) * (-Math.pow(2, -10 * --t) + 2) + b
      }
    } as any)

  export const easeInOutBack: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number) => {
        let s = 1.70158
        if ((t /= d / 2) < 1) return (c / 2) * (t * t * (((s *= 1.525) + 1) * t - s)) + b
        return (c / 2) * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b
      }
    } as any)

  export const easeOutBack: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number, d: number) => {
        let s = 1.70158
        return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b
      }
    } as any)

  export const easeInBounce: () => TimingObject = () =>
    ({
      fn: (d: number) => (x: number, t: number, d: number) => {
        return c - easeOutBounce().fn(d)(x, d - t, 0, c, d) + b
      }
    } as any)

  export const easeInOutBounce: () => Timing = () =>
    ({
      fn: (d: number) => (x: number, t: number, d: number) => {
        if (t < d / 2) return easeInBounce().fn(d)(x, t * 2, 0, c, d) * 0.5 + b
        return easeOutBounce().fn(d)(x, t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b
      }
    } as any)
}

// animate({
//   duration: 2000,
//   timing: easeInQuad(),
//   lapse: 20,
//   draw(progress) {
//   console.log(progress * 100 + '%');
//   }
// });

// TODO:
// easeInOutSine: function (x, t, b, c, d) {
// 	return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
// },
// easeOutExpo: function (x, t, b, c, d) {
// 	return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
// },
// easeInCirc: function (x, t, b, c, d) {
// 	return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
// },
// easeOutCirc: function (x, t, b, c, d) {
// 	return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
// },
// easeInOutCirc: function (x, t, b, c, d) {
// 	if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
// 	return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
// },
// easeInBack: function (x, t, b, c, d, s) {
// 	if (s == undefined) s = 1.70158;
// 	return c*(t/=d)*t*((s+1)*t - s) + b;
// },
// easeInBounce: function (x, t, b, c, d) {
// 	return c - jQuery.easing.easeOutBounce (x, d-t, 0, c, d) + b;
// },
// easeInOutBounce: function (x, t, b, c, d) {
// 	if (t < d/2) return jQuery.easing.easeInBounce (x, t*2, 0, c, d) * .5 + b;
// 	return jQuery.easing.easeOutBounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
// }

// animate({
//   duration: 1000,
//   timing(timeFraction) {
//     return timeFraction;
//   },
//   draw(progress) {
//   console.log(progress * 100 + '%');

//   }
// });

// setImmediate((t)=>{
//   console.log(t);

// })

// function requestAnimationFrame(f){
//   setImmediate(()=>f(Date.now()))
// }

// function animate({duration, draw, timing}) {

//   let start = performance.now();

//   requestAnimationFrame(function animate(time) {
//     let timeFraction = (time - start) / duration;
//     if (timeFraction > 1) timeFraction = 1;

//     let progress = timing(timeFraction)

//     draw(progress);

//     if (timeFraction < 1) {
//       requestAnimationFrame(animate);
//     }

//   });
// }
// The code for it: