export class AnimationEaseElastic {
    static in(t:number, b:number, c:number, d:number):number {
        return AnimationEaseElastic.inExtended(t, b, c, d, 0.0, 0.0);
    }


    static inExtended(t:number, b:number, c:number, d:number, a:number, p:number):number {
        if (t == 0.0) return b;
        if ((t /= d) == 1.0) return b + c;
        if (p == 0.0) p = d * 0.3;

        let s:number = 0.0;

        if (a == 0.0 || a < Math.abs(c)) {
            a = c;
            s = p * 0.25;
        } 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)) + b;
    }


    static out(t:number, b:number, c:number, d:number):number {
        return AnimationEaseElastic.outExtended(t, b, c, d, 0.0, 0.0);
    }


    static outExtended(t:number, b:number, c:number, d:number, a:number, p:number):number {
        if (t == 0.0) return b;
        if ((t /= d) == 1) return b + c;
        if (p == 0.0) p = d * 0.3;

        let s:number = 0.0;

        if (a == 0.0 || a < Math.abs(c)) {
            a = c;
            s = p * 0.25;
        } 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;
    }


    static inOut(t:number, b:number, c:number, d:number):number {
        return AnimationEaseElastic.inOutExtended(t, b, c, d, 0.0, 0.0);
    }


    static inOutExtended(t:number, b:number, c:number, d:number, a:number, p:number):number {
        if (t == 0.0) return b;
        if ((t /= d * 0.5) == 2) return b + c;
        if (p == 0.0) p = d * (0.3 * 1.5);

        let s:number = 0.0;
        if (a == 0 || a < Math.abs(c)) {
            a = c;
            s = p * 0.25;
        } else s = p / (2 * Math.PI) * Math.asin(c / a);

        if (t < 1.0) 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;
    }
} // End class


export default AnimationEaseElastic;