/**
 * @author alteredq / http://alteredqualia.com/
 * @author mrdoob / http://mrdoob.com/
 * @author WestLangley / http://github.com/WestLangley
 * @author thezwap
 */

var _lut = [];

for ( var i = 0; i < 256; i ++ ) {

	_lut[ i ] = ( i < 16 ? '0' : '' ) + ( i ).toString( 16 );

}

var MathUtils = {

	DEG2RAD: Math.PI / 180,
	RAD2DEG: 180 / Math.PI,

	generateUUID: function () {

		// http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript/21963136#21963136

		var d0 = Math.random() * 0xffffffff | 0;
		var d1 = Math.random() * 0xffffffff | 0;
		var d2 = Math.random() * 0xffffffff | 0;
		var d3 = Math.random() * 0xffffffff | 0;
		var uuid = _lut[ d0 & 0xff ] + _lut[ d0 >> 8 & 0xff ] + _lut[ d0 >> 16 & 0xff ] + _lut[ d0 >> 24 & 0xff ] + '-' +
			_lut[ d1 & 0xff ] + _lut[ d1 >> 8 & 0xff ] + '-' + _lut[ d1 >> 16 & 0x0f | 0x40 ] + _lut[ d1 >> 24 & 0xff ] + '-' +
			_lut[ d2 & 0x3f | 0x80 ] + _lut[ d2 >> 8 & 0xff ] + '-' + _lut[ d2 >> 16 & 0xff ] + _lut[ d2 >> 24 & 0xff ] +
			_lut[ d3 & 0xff ] + _lut[ d3 >> 8 & 0xff ] + _lut[ d3 >> 16 & 0xff ] + _lut[ d3 >> 24 & 0xff ];

		// .toUpperCase() here flattens concatenated strings to save heap memory space.
		return uuid.toUpperCase();

	},

	clamp: function ( value, min, max ) {

		return Math.max( min, Math.min( max, value ) );

	},

	// compute euclidian modulo of m % n
	// https://en.wikipedia.org/wiki/Modulo_operation

	euclideanModulo: function ( n, m ) {

		return ( ( n % m ) + m ) % m;

	},

	// Linear mapping from range <a1, a2> to range <b1, b2>

	mapLinear: function ( x, a1, a2, b1, b2 ) {

		return b1 + ( x - a1 ) * ( b2 - b1 ) / ( a2 - a1 );

	},

	// https://en.wikipedia.org/wiki/Linear_interpolation

	lerp: function ( x, y, t ) {

		return ( 1 - t ) * x + t * y;

	},

	// http://en.wikipedia.org/wiki/Smoothstep

	smoothstep: function ( x, min, max ) {

		if ( x <= min ) return 0;
		if ( x >= max ) return 1;

		x = ( x - min ) / ( max - min );

		return x * x * ( 3 - 2 * x );

	},

	smootherstep: function ( x, min, max ) {

		if ( x <= min ) return 0;
		if ( x >= max ) return 1;

		x = ( x - min ) / ( max - min );

		return x * x * x * ( x * ( x * 6 - 15 ) + 10 );

	},

	// Random integer from <low, high> interval

	randInt: function ( low, high ) {

		return low + Math.floor( Math.random() * ( high - low + 1 ) );

	},

	// Random float from <low, high> interval

	randFloat: function ( low, high ) {

		return low + Math.random() * ( high - low );

	},

	// Random float from <-range/2, range/2> interval

	randFloatSpread: function ( range ) {

		return range * ( 0.5 - Math.random() );

	},

	degToRad: function ( degrees ) {

		return degrees * MathUtils.DEG2RAD;

	},

	radToDeg: function ( radians ) {

		return radians * MathUtils.RAD2DEG;

	},

	isPowerOfTwo: function ( value ) {

		return ( value & ( value - 1 ) ) === 0 && value !== 0;

	},

	ceilPowerOfTwo: function ( value ) {

		return Math.pow( 2, Math.ceil( Math.log( value ) / Math.LN2 ) );

	},

	floorPowerOfTwo: function ( value ) {

		return Math.pow( 2, Math.floor( Math.log( value ) / Math.LN2 ) );

	},

	setQuaternionFromProperEuler: function ( q, a, b, c, order ) {

		// Intrinsic Proper Euler Angles - see https://en.wikipedia.org/wiki/Euler_angles

		// rotations are applied to the axes in the order specified by 'order'
		// rotation by angle 'a' is applied first, then by angle 'b', then by angle 'c'
		// angles are in radians

		var cos = Math.cos;
		var sin = Math.sin;

		var c2 = cos( b / 2 );
		var s2 = sin( b / 2 );

		var c13 = cos( ( a + c ) / 2 );
		var s13 = sin( ( a + c ) / 2 );

		var c1_3 = cos( ( a - c ) / 2 );
		var s1_3 = sin( ( a - c ) / 2 );

		var c3_1 = cos( ( c - a ) / 2 );
		var s3_1 = sin( ( c - a ) / 2 );

		switch ( order ) {

			case 'XYX':
				q.set( c2 * s13, s2 * c1_3, s2 * s1_3, c2 * c13 );
				break;

			case 'YZY':
				q.set( s2 * s1_3, c2 * s13, s2 * c1_3, c2 * c13 );
				break;

			case 'ZXZ':
				q.set( s2 * c1_3, s2 * s1_3, c2 * s13, c2 * c13 );
				break;

			case 'XZX':
				q.set( c2 * s13, s2 * s3_1, s2 * c3_1, c2 * c13 );
				break;

			case 'YXY':
				q.set( s2 * c3_1, c2 * s13, s2 * s3_1, c2 * c13 );
				break;

			case 'ZYZ':
				q.set( s2 * s3_1, s2 * c3_1, c2 * s13, c2 * c13 );
				break;

			default:
				console.warn( 'THREE.MathUtils: .setQuaternionFromProperEuler() encountered an unknown order: ' + order );

		}

	}

};


export { MathUtils };
