const Tween = {
  Linear: function(t: number, b: number, c: number, d: number) {
      return c * t / d + b;
  },
  Quad: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return c * (t /= d) * t + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return -c *(t /= d)*(t-2) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          if ((t /= d / 2) < 1) return c / 2 * t * t + b;
          return -c / 2 * ((--t) * (t-2) - 1) + b;
      }
  },
  Cubic: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return c * (t /= d) * t * t + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return c * ((t = t/d - 1) * t * t + 1) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          if ((t /= d / 2) < 1) return c / 2 * t * t*t + b;
          return c / 2*((t -= 2) * t * t + 2) + b;
      }
  },
  Quart: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return c * (t /= d) * t * t*t + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return -c * ((t = t/d - 1) * t * t*t - 1) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
          return -c / 2 * ((t -= 2) * t * t*t - 2) + b;
      }
  },
  Quint: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return c * (t /= d) * t * t * t * t + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return c * ((t = t/d - 1) * t * t * t * t + 1) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: 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;
      }
  },
  Sine: {
      easeIn: function(t: number, b: any, c: number, d: number) {
          return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return c * Math.sin(t/d * (Math.PI/2)) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          return -c / 2 * (Math.cos(Math.PI * t/d) - 1) + b;
      }
  },
  Expo: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return (t==d) ? b + c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: 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;
      }
  },
  Circ: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number) {
          return c * Math.sqrt(1 - (t = t/d - 1) * t) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          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;
      }
  },
  Elastic: {
      easeIn: function(t: number, b: number, c: number, d: number, a: number, p: number) {
          var s: number;
          if (t==0) return b;
          if ((t /= d) == 1) return b + c;
          if (typeof p == "undefined") p = d * .3;
          if (!a || a < Math.abs(c)) {
              s = p / 4;
              a = c;
          } 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;
      },
      easeOut: function(t: number, b: any, c: number, d: number, a: number, p: number) {
          var s: number;
          if (t==0) return b;
          if ((t /= d) == 1) return b + c;
          if (typeof p == "undefined") p = d * .3;
          if (!a || a < Math.abs(c)) {
              a = c; 
              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);
      },
      easeInOut: function(t: number, b: number, c: number, d: number, a: number, p: number) {
          var s: number;
          if (t==0) return b;
          if ((t /= d / 2) == 2) return b+c;
          if (typeof p == "undefined") p = d * (.3 * 1.5);
          if (!a || a < Math.abs(c)) {
              a = c; 
              s = p / 4;
          } else {
              s = p / (2  *Math.PI) * Math.asin(c / a);
          }
          if (t < 1) return -.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 ) * .5 + c + b;
      }
  },
  Back: {
      easeIn: function(t: number, b: number, c: number, d: number, s: number) {
          if (typeof s == "undefined") s = 1.70158;
          return c * (t /= d) * t * ((s + 1) * t - s) + b;
      },
      easeOut: function(t: number, b: number, c: number, d: number, s: number) {
          if (typeof s == "undefined") s = 1.70158;
          return c * ((t = t/d - 1) * t * ((s + 1) * t + s) + 1) + b;
      },
      easeInOut: function(t: number, b: number, c: number, d: number, s: number) {
          if (typeof s == "undefined") 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;
      }
  },
  Bounce: {
      easeIn: function(t: number, b: number, c: number, d: number) {
          return c - Tween.Bounce.easeOut(d-t, 0, c, d) + b;
      },
      easeOut: function(t: number, b: number, c: number, d: 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 + .75) + b;
          } else if (t < (2.5 / 2.75)) {
              return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
          } else {
              return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
          }
      },
      easeInOut: function(t: number, b: number, c: number, d: number) {
          if (t < d / 2) {
              return Tween.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
          } else {
              return Tween.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
          }
      }
  }
}

export const TweenMap = {
  'Linear': Tween.Linear,
  'Quad-easeIn': Tween.Quad.easeIn,
  'Quad-easeOut': Tween.Quad.easeOut,
  'Quad-easeInOut': Tween.Quad.easeInOut,
  'Cubic-easeIn': Tween.Cubic.easeIn,
  'Cubic-easeOut': Tween.Cubic.easeOut,
  'Cubic-easeInOut': Tween.Cubic.easeInOut,
  'Quart-easeIn': Tween.Quart.easeIn,
  'Quart-easeOut': Tween.Quart.easeOut,
  'Quart-easeInOut': Tween.Quart.easeInOut,
  'Quint-easeIn': Tween.Quint.easeIn,
  'Quint-easeOut': Tween.Quint.easeOut,
  'Quint-easeInOut': Tween.Quint.easeInOut,
  'Sine-easeIn': Tween.Sine.easeIn,
  'Sine-easeOut': Tween.Sine.easeOut,
  'Sine-easeInOut': Tween.Sine.easeInOut,
  'Expo-easeIn': Tween.Expo.easeIn,
  'Expo-easeOut': Tween.Expo.easeOut,
  'Expo-easeInOut': Tween.Expo.easeInOut,
  'Circ-easeIn': Tween.Circ.easeIn,
  'Circ-easeOut': Tween.Circ.easeOut,
  'Circ-easeInOut': Tween.Circ.easeInOut,
  'Elastic-easeIn': Tween.Elastic.easeIn,
  'Elastic-easeOut': Tween.Elastic.easeOut,
  'Elastic-easeInOut': Tween.Elastic.easeInOut,
  'Back-easeIn': Tween.Back.easeIn,
  'Back-easeOut': Tween.Back.easeOut,
  'Back-easeInOut': Tween.Back.easeInOut,
  'Bounce-easeIn': Tween.Bounce.easeIn,
  'Bounce-easeOut': Tween.Bounce.easeOut,
  'Bounce-easeInOut': Tween.Bounce.easeInOut,
}

export default Tween