/**
 * Tween.js - Licensed under the MIT license
 * https://github.com/tweenjs/tween.js
 * ----------------------------------------------
 *
 * See https://github.com/tweenjs/tween.js/graphs/contributors for the full list of contributors.
 * Thank you all, you're awesome!
 */

var TWEEN = TWEEN || (function () {

	var _tweens = [];

	return {

		getAll: function () {

			return _tweens;

		},

		removeAll: function () {

			_tweens = [];

		},

		add: function (tween) {

			_tweens.push(tween);

		},

		remove: function (tween) {

			var i = _tweens.indexOf(tween);

			if (i !== -1) {
				_tweens.splice(i, 1);
			}

		},

		update: function (time, preserve) {

			if (_tweens.length === 0) {
				return false;
			}

			var i = 0;

			time = time !== undefined ? time : TWEEN.now();

			while (i < _tweens.length) {

				if (_tweens[i].update(time) || preserve) {
					i++;
				} else {
					_tweens.splice(i, 1);
				}

			}

			return true;

		}
	};

})();


// Include a performance.now polyfill.
// In node.js, use process.hrtime.
if (typeof (window) === 'undefined' && typeof (process) !== 'undefined') {
	TWEEN.now = function () {
		var time = process.hrtime();

		// Convert [seconds, nanoseconds] to milliseconds.
		return time[0] * 1000 + time[1] / 1000000;
	};
}
// In a browser, use window.performance.now if it is available.
else if (typeof (window) !== 'undefined' &&
         window.performance !== undefined &&
		 window.performance.now !== undefined) {
	// This must be bound, because directly assigning this function
	// leads to an invocation exception in Chrome.
	TWEEN.now = window.performance.now.bind(window.performance);
}
// Use Date.now if it is available.
else if (Date.now !== undefined) {
	TWEEN.now = Date.now;
}
// Otherwise, use 'new Date().getTime()'.
else {
	TWEEN.now = function () {
		return new Date().getTime();
	};
}


TWEEN.Tween = function (object) {

	var _object = null;
	if(object) _object = object;


	var _duration = 1000;
	var _time = 0;
	var _startTime = null;

	var _reversed = false;
	this.isPlaying = false;

	
	var _easingFunction = TWEEN.Easing.Linear.None;
	var _interpolationFunction = TWEEN.Interpolation.Linear;


	var _valuesStartOrigin = null;
	var _valuesEndOrigin = null;
	var _valuesStart = {};
	var _valuesEnd = {};

	

	var _isReset = true;



	var _deltas = {};
	var _deltas_init = {};

	var _onCompleteCallback = null;
	var _onCompleteCallbackScope = null;
	var _onReverseCompleteCallback = null;
	var _onReverseCompleteCallbackScope = null;

	
	this.setObject = function (object) {
		if(object)
			_object = object;
	};

	//Computes new deltas to tween to
	this.to = function (properties, duration) {
		_isReset = true;
		if (duration !== undefined) {
			_duration = duration;
		}

		var property, start=0, end=0;
		for (property in properties)
		{
			if (_object[property] === undefined) {
				continue;
			}

			start = _object[property];
			end = properties[property];
			_deltas[property] = end - start;
			_deltas_init[property] = _deltas[property];
		}

		return this;
	};


	this.reverse = function () {

		var property;
		
		if(this.isPlaying){
			this.isPlaying = false;
			for (property in _deltas) {
				if(_reversed){
					_deltas[property] = (1-_value)*_deltas[property];
				}else{
					_deltas[property] = _deltas_init[property]-(1-_value)*_deltas[property];
				}
			}

			if(_reversed){
				//console.log("start reverse, currently playing, reverse");
			}else{
				//console.log("start reverse, currently playing, no reverse");
			}
		}else{
			//console.log("start reverse, currently not playing; ");
			for (property in _deltas)
			{
				_deltas[property] = _deltas_init[property];
			}
		}

		_isReset = false;
		_prevValue = 0;
		_reversed = true;
		_time = TWEEN.now();
		_startTime = TWEEN.now();
		this.isPlaying = true;


		return this;
	};

	this.start = function (time) {
		var property;
		
		
		if(this.isPlaying){
			this.isPlaying = false;
			
			if(!_isReset){
				for (property in _deltas) {
					if(_reversed){
						_deltas[property] = _deltas_init[property]-(1-_value)*_deltas[property];
					}else{
						_deltas[property] = (1-_value)*_deltas[property];
					}
				}
			}


			if(_reversed){
				//console.log("start, currently playing, reverse");
			}else{
				//console.log("start, currently playing, no reverse");
			}
		}else{
			//console.log("start, currently not playing; ");
			for (property in _deltas)
			{
				_deltas[property] = _deltas_init[property];
			}
		}


		
		_isReset = false;
		_reversed = false;
		_prevValue = 0;
		_time = TWEEN.now();
		_startTime = _time;
		this.isPlaying = true;

		
		return this;
	};


	
	
	var _value = 0; //from 0 to 1 ; output of the tween function
	var _dvalue = 0; //delta _value and the one of the previous dt
	var _prevValue = 0; //_value of the previous dt

	this.update = function (dt) {

		var property;
		var elapsed; //% of the duration; from 0 to 1;

		_time = _time + dt;
		if (_time < _startTime) {
			return true;
		}
		elapsed = (_time - _startTime) / _duration;
		elapsed = elapsed > 1 ? 1 : elapsed;


		_value = _easingFunction(elapsed);
		_dvalue = _value - _prevValue;
		_prevValue = _value;
		
		var dv = 0;

		for (property in _deltas) {
			if(_reversed){
				_object[property] += -_dvalue*_deltas[property];
			}else{
				_object[property] += _dvalue*_deltas[property];	
			}
			

			/*_object[property] = start + dValues[property] * value;
			dv = (start + (end - start) * value) - _object[property];*/
		}



		if (elapsed === 1) {
			if (_onCompleteCallback !== null && !_reversed) {
				if(_onCompleteCallbackScope!=null){
					_onCompleteCallback.call(_onCompleteCallbackScope);
				}else{
					_onCompleteCallback.call(_object, _object);	
				}
				
			}

			if ((_onReverseCompleteCallback !== null) && _reversed) {
				if(_onReverseCompleteCallbackScope!=null){
					_onReverseCompleteCallback.call(_onReverseCompleteCallbackScope);
				}else{
					_onReverseCompleteCallback.call(_object, _object);
				}
			}

			this.isPlaying = false;
			return false;
		}

		return true;

	};






	this.onComplete = function (callback,scope) {
		_onCompleteCallback = callback;
		_onCompleteCallbackScope = scope;
		return this;
	};

	this.onReverseComplete = function (callback,scope) {

		_onReverseCompleteCallback = callback;
		_onReverseCompleteCallbackScope = scope;
		return this;

	};


	this.easing = function (easing) {

		_easingFunction = easing;
		return this;

	};

	this.interpolation = function (interpolation) {

		_interpolationFunction = interpolation;
		return this;

	};

};

TWEEN.Easing = {

	Linear: {

		None: function (k) {

			return k;

		}

	},

	Quadratic: {

		In: function (k) {

			return k * k;

		},

		Out: function (k) {

			return k * (2 - k);

		},

		InOut: function (k) {

			if ((k *= 2) < 1) {
				return 0.5 * k * k;
			}

			return - 0.5 * (--k * (k - 2) - 1);

		}

	},

	Cubic: {

		In: function (k) {

			return k * k * k;

		},

		Out: function (k) {

			return --k * k * k + 1;

		},

		InOut: function (k) {

			if ((k *= 2) < 1) {
				return 0.5 * k * k * k;
			}

			return 0.5 * ((k -= 2) * k * k + 2);

		}

	},

	Quartic: {

		In: function (k) {

			return k * k * k * k;

		},

		Out: function (k) {

			return 1 - (--k * k * k * k);

		},

		InOut: function (k) {

			if ((k *= 2) < 1) {
				return 0.5 * k * k * k * k;
			}

			return - 0.5 * ((k -= 2) * k * k * k - 2);

		}

	},

	Quintic: {

		In: function (k) {

			return k * k * k * k * k;

		},

		Out: function (k) {

			return --k * k * k * k * k + 1;

		},

		InOut: function (k) {

			if ((k *= 2) < 1) {
				return 0.5 * k * k * k * k * k;
			}

			return 0.5 * ((k -= 2) * k * k * k * k + 2);

		}

	},

	Sinusoidal: {

		In: function (k) {

			return 1 - Math.cos(k * Math.PI / 2);

		},

		Out: function (k) {

			return Math.sin(k * Math.PI / 2);

		},

		InOut: function (k) {

			return 0.5 * (1 - Math.cos(Math.PI * k));

		}

	},

	Exponential: {

		In: function (k) {

			return k === 0 ? 0 : Math.pow(1024, k - 1);

		},

		Out: function (k) {

			return k === 1 ? 1 : 1 - Math.pow(2, - 10 * k);

		},

		InOut: function (k) {

			if (k === 0) {
				return 0;
			}

			if (k === 1) {
				return 1;
			}

			if ((k *= 2) < 1) {
				return 0.5 * Math.pow(1024, k - 1);
			}

			return 0.5 * (- Math.pow(2, - 10 * (k - 1)) + 2);

		}

	},

	Circular: {

		In: function (k) {

			return 1 - Math.sqrt(1 - k * k);

		},

		Out: function (k) {

			return Math.sqrt(1 - (--k * k));

		},

		InOut: function (k) {

			if ((k *= 2) < 1) {
				return - 0.5 * (Math.sqrt(1 - k * k) - 1);
			}

			return 0.5 * (Math.sqrt(1 - (k -= 2) * k) + 1);

		}

	},

	Elastic: {

		In: function (k) {

			if (k === 0) {
				return 0;
			}

			if (k === 1) {
				return 1;
			}

			return -Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);

		},

		Out: function (k) {

			if (k === 0) {
				return 0;
			}

			if (k === 1) {
				return 1;
			}

			return Math.pow(2, -10 * k) * Math.sin((k - 0.1) * 5 * Math.PI) + 1;

		},

		InOut: function (k) {

			if (k === 0) {
				return 0;
			}

			if (k === 1) {
				return 1;
			}

			k *= 2;

			if (k < 1) {
				return -0.5 * Math.pow(2, 10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI);
			}

			return 0.5 * Math.pow(2, -10 * (k - 1)) * Math.sin((k - 1.1) * 5 * Math.PI) + 1;

		}

	},

	Back: {

		In: function (k) {

			var s = 1.70158;

			return k * k * ((s + 1) * k - s);

		},

		Out: function (k) {

			var s = 1.70158;

			return --k * k * ((s + 1) * k + s) + 1;

		},

		InOut: function (k) {

			var s = 1.70158 * 1.525;

			if ((k *= 2) < 1) {
				return 0.5 * (k * k * ((s + 1) * k - s));
			}

			return 0.5 * ((k -= 2) * k * ((s + 1) * k + s) + 2);

		}

	},

	Bounce: {

		In: function (k) {

			return 1 - TWEEN.Easing.Bounce.Out(1 - k);

		},

		Out: function (k) {

			if (k < (1 / 2.75)) {
				return 7.5625 * k * k;
			} else if (k < (2 / 2.75)) {
				return 7.5625 * (k -= (1.5 / 2.75)) * k + 0.75;
			} else if (k < (2.5 / 2.75)) {
				return 7.5625 * (k -= (2.25 / 2.75)) * k + 0.9375;
			} else {
				return 7.5625 * (k -= (2.625 / 2.75)) * k + 0.984375;
			}

		},

		InOut: function (k) {

			if (k < 0.5) {
				return TWEEN.Easing.Bounce.In(k * 2) * 0.5;
			}

			return TWEEN.Easing.Bounce.Out(k * 2 - 1) * 0.5 + 0.5;

		}

	}

};

TWEEN.Interpolation = {

	Linear: function (v, k) {

		var m = v.length - 1;
		var f = m * k;
		var i = Math.floor(f);
		var fn = TWEEN.Interpolation.Utils.Linear;

		if (k < 0) {
			return fn(v[0], v[1], f);
		}

		if (k > 1) {
			return fn(v[m], v[m - 1], m - f);
		}

		return fn(v[i], v[i + 1 > m ? m : i + 1], f - i);

	},

	Bezier: function (v, k) {

		var b = 0;
		var n = v.length - 1;
		var pw = Math.pow;
		var bn = TWEEN.Interpolation.Utils.Bernstein;

		for (var i = 0; i <= n; i++) {
			b += pw(1 - k, n - i) * pw(k, i) * v[i] * bn(n, i);
		}

		return b;

	},

	CatmullRom: function (v, k) {

		var m = v.length - 1;
		var f = m * k;
		var i = Math.floor(f);
		var fn = TWEEN.Interpolation.Utils.CatmullRom;

		if (v[0] === v[m]) {

			if (k < 0) {
				i = Math.floor(f = m * (1 + k));
			}

			return fn(v[(i - 1 + m) % m], v[i], v[(i + 1) % m], v[(i + 2) % m], f - i);

		} else {

			if (k < 0) {
				return v[0] - (fn(v[0], v[0], v[1], v[1], -f) - v[0]);
			}

			if (k > 1) {
				return v[m] - (fn(v[m], v[m], v[m - 1], v[m - 1], f - m) - v[m]);
			}

			return fn(v[i ? i - 1 : 0], v[i], v[m < i + 1 ? m : i + 1], v[m < i + 2 ? m : i + 2], f - i);

		}

	},

	Utils: {

		Linear: function (p0, p1, t) {

			return (p1 - p0) * t + p0;

		},

		Bernstein: function (n, i) {

			var fc = TWEEN.Interpolation.Utils.Factorial;

			return fc(n) / fc(i) / fc(n - i);

		},

		Factorial: (function () {

			var a = [1];

			return function (n) {

				var s = 1;

				if (a[n]) {
					return a[n];
				}

				for (var i = n; i > 1; i--) {
					s *= i;
				}

				a[n] = s;
				return s;

			};

		})(),

		CatmullRom: function (p0, p1, p2, p3, t) {

			var v0 = (p2 - p0) * 0.5;
			var v1 = (p3 - p1) * 0.5;
			var t2 = t * t;
			var t3 = t * t2;

			return (2 * p1 - 2 * p2 + v0 + v1) * t3 + (- 3 * p1 + 3 * p2 - 2 * v0 - v1) * t2 + v0 * t + p1;

		}

	}

};

// UMD (Universal Module Definition)
(function (root) {

	if (typeof define === 'function' && define.amd) {

		// AMD
		define([], function () {
			return TWEEN;
		});

	} else if (typeof module !== 'undefined' && typeof exports === 'object') {

		// Node.js
		module.exports = TWEEN;

	} else if (root !== undefined) {

		// Global variable
		root.TWEEN = TWEEN;

	}

})(this);