/*jslint bitwise: true */
'use strict';

(function() {
    return {
        abs: Math.abs,
        acos: Math.acos,
        asin: Math.asin,
        atan: Math.atan,
        atan2: Math.atan2,
        ceil: Math.ceil,
        cos: Math.cos,
        cosh: function(x) {
            var y = Math.exp(x);
            return (y + 1 / y) / 2;
        },
        deg: function(x) {
            return x / (Math.PI / 180);
        },
        exp: Math.exp,
        floor: Math.floor,
        fmod: function(x, y) {
            return Number((x - (Math.floor(x / y) * y)).toPrecision(8));
        },
        // Article: http://croquetweak.blogspot.com/2014/08/deconstructing-floats-frexp-and-ldexp.html
        // https://github.com/bertfreudenberg/SqueakJS/commit/e4d60ea16cc1d9868872dde6033e0bbf5166bd6f
        frexp: function(x) {
            if (x === 0.0) return 0;
            var data = new DataView(new ArrayBuffer(8));
            data.setFloat64(0, x);
            var bits = (data.getUint32(0) >>> 20) & 0x7FF;
            if (bits === 0) {
                data.setFloat64(0, x * Math.pow(2, 64));
                bits = ((data.getUint32(0) >>> 20) & 0x7FF) - 64;
            }
            var e = bits - 1022;
            var m = this.ldexp(x, -e);
            return [m, e];
        },
        huge: Infinity,
        // Article: http://croquetweak.blogspot.com/2014/08/deconstructing-floats-frexp-and-ldexp.html
        // https://github.com/bertfreudenberg/SqueakJS/commit/e4d60ea16cc1d9868872dde6033e0bbf5166bd6f
        ldexp: function(m, e) {
            return e <= 1023 ?
              m * Math.pow(2, e) :
                m * Math.pow(2, 1023) * Math.pow(2, e - 1023);
        },
        log: Math.log,
        log10: function(x) {
            return Math.log(x) / Math.LN10;
        },
        max: Math.max,
        min: Math.min,
        modf: function(x) {
            return [Math.floor(x), x % 1];
        },
        pi: Math.PI,
        pow: Math.pow,
        rad: function(x) {
            return x * (Math.PI / 180);
        },
        random: function(m, n) {
            var r = Math.random();
            var l, u;
            if (m && n) {
                            l = m;
              u = n;
              return Math.floor(r * (u - l + 1) + l);
            } else if (m) {
              u = m;
              return Math.floor(r * u) + 1;
            } else {
              return r;
            }
        },
        // Does nothing
        randomseed: function(){},
        sin: Math.sin,
        sinh: function(x) {
            var y = Math.exp(x);
            return (y - 1/y) / 2;
        },
        sqrt: Math.sqrt,
        tan: Math.tan,
        tanh: function(x) {
            if(x === Infinity) {
                return 1;
            } else if(x === -Infinity) {
                return -1;
            } else {
                var y = Math.exp(2 * x);
                return (y - 1) / (y + 1);
            }
        }
    };
}());