define(["dojo/_base/lang", "./_base", "./matrix", "dojo/_base/Color", "dojo/_base/array", "dojo/_base/fx", "dojo/_base/connect", "dojo/sniff"], 
  function(lang, g, m, Color, arr, fx, Hub, has){
	var fxg = g.fx = {};

	// Generic interpolators. Should they be moved to dojox.fx?

	function InterpolNumber(start, end){
		this.start = start, this.end = end;
	}
	InterpolNumber.prototype.getValue = function(r){
		return (this.end - this.start) * r + this.start;
	};

	function InterpolUnit(start, end, units){
		this.start = start, this.end = end;
		this.units = units;
	}
	InterpolUnit.prototype.getValue = function(r){
		return (this.end - this.start) * r + this.start + this.units;
	};

	function InterpolColor(start, end){
		this.start = start, this.end = end;
		this.temp = new Color();
	}
	InterpolColor.prototype.getValue = function(r){
		return Color.blendColors(this.start, this.end, r, this.temp);
	};

	function InterpolValues(values){
		this.values = values;
		this.length = values.length;
	}
	InterpolValues.prototype.getValue = function(r){
		return this.values[Math.min(Math.floor(r * this.length), this.length - 1)];
	};

	function InterpolObject(values, def){
		this.values = values;
		this.def = def ? def : {};
	}
	InterpolObject.prototype.getValue = function(r){
		var ret = lang.clone(this.def);
		for(var i in this.values){
			ret[i] = this.values[i].getValue(r);
		}
		return ret;
	};

	function InterpolTransform(stack, original){
		this.stack = stack;
		this.original = original;
	}
	InterpolTransform.prototype.getValue = function(r){
		var ret = [];
		arr.forEach(this.stack, function(t){
			if(t instanceof m.Matrix2D){
				ret.push(t);
				return;
			}
			if(t.name == "original" && this.original){
				ret.push(this.original);
				return;
			}
 			// Adding support for custom matrices
 			if(t.name == "matrix"){
 				if((t.start instanceof m.Matrix2D) && (t.end instanceof m.Matrix2D)){
 					var transfMatrix = new m.Matrix2D();
 					for(var p in t.start) {
 						transfMatrix[p] = (t.end[p] - t.start[p])*r + t.start[p];
 					}
 					ret.push(transfMatrix);
 				}
 				return;
 			}
			if(!(t.name in m)){ return; }
			var f = m[t.name];
			if(typeof f != "function"){
				// constant
				ret.push(f);
				return;
			}
			var val = arr.map(t.start, function(v, i){
							return (t.end[i] - v) * r + v;
						}),
				matrix = f.apply(m, val);
			if(matrix instanceof m.Matrix2D){
				ret.push(matrix);
			}
		}, this);
		return ret;
	};

	var transparent = new Color(0, 0, 0, 0);

	function getColorInterpol(prop, obj, name, def){
		if(prop.values){
			return new InterpolValues(prop.values);
		}
		var value, start, end;
		if(prop.start){
			start = g.normalizeColor(prop.start);
		}else{
			start = value = obj ? (name ? obj[name] : obj) : def;
		}
		if(prop.end){
			end = g.normalizeColor(prop.end);
		}else{
			if(!value){
				value = obj ? (name ? obj[name] : obj) : def;
			}
			end = value;
		}
		return new InterpolColor(start, end);
	}

	function getNumberInterpol(prop, obj, name, def){
		if(prop.values){
			return new InterpolValues(prop.values);
		}
		var value, start, end;
		if(prop.start){
			start = prop.start;
		}else{
			start = value = obj ? obj[name] : def;
		}
		if(prop.end){
			end = prop.end;
		}else{
			if(typeof value != "number"){
				value = obj ? obj[name] : def;
			}
			end = value;
		}
		return new InterpolNumber(start, end);
	}

	fxg.animateStroke = function(/*Object*/ args){
		// summary:
		//		Returns an animation which will change stroke properties over time.
		// args:
		//		an object defining the animation setting.
		// example:
		//	|	fxg.animateStroke{{
		//	|		shape: shape,
		//	|		duration: 500,
		//	|		color: {start: "red", end: "green"},
		//	|		width: {end: 15},
		//	|		join:  {values: ["miter", "bevel", "round"]}
		//	|	}).play();
		if(!args.easing){ args.easing = fx._defaultEasing; }
		var anim = new fx.Animation(args), shape = args.shape, stroke;
		Hub.connect(anim, "beforeBegin", anim, function(){
			stroke = shape.getStroke();
			var prop = args.color, values = {}, value, start, end;
			if(prop){
				values.color = getColorInterpol(prop, stroke, "color", transparent);
			}
			prop = args.style;
			if(prop && prop.values){
				values.style = new InterpolValues(prop.values);
			}
			prop = args.width;
			if(prop){
				values.width = getNumberInterpol(prop, stroke, "width", 1);
			}
			prop = args.cap;
			if(prop && prop.values){
				values.cap = new InterpolValues(prop.values);
			}
			prop = args.join;
			if(prop){
				if(prop.values){
					values.join = new InterpolValues(prop.values);
				}else{
					start = prop.start ? prop.start : (stroke && stroke.join || 0);
					end = prop.end ? prop.end : (stroke && stroke.join || 0);
					if(typeof start == "number" && typeof end == "number"){
						values.join = new InterpolNumber(start, end);
					}
				}
			}
			this.curve = new InterpolObject(values, stroke);
		});
		Hub.connect(anim, "onAnimate", shape, "setStroke");
		return anim; // dojo.Animation
	};

	fxg.animateFill = function(/*Object*/ args){
		// summary:
		//		Returns an animation which will change fill color over time.
		//		Only solid fill color is supported at the moment
		// args:
		//		an object defining the animation setting.
		// example:
		//	|	gfx.animateFill{{
		//	|		shape: shape,
		//	|		duration: 500,
		//	|		color: {start: "red", end: "green"}
		//	|	}).play();
		if(!args.easing){ args.easing = fx._defaultEasing; }
		var anim = new fx.Animation(args), shape = args.shape, fill;
		Hub.connect(anim, "beforeBegin", anim, function(){
			fill = shape.getFill();
			var prop = args.color, values = {};
			if(prop){
				this.curve = getColorInterpol(prop, fill, "", transparent);
			}
		});
		Hub.connect(anim, "onAnimate", shape, "setFill");
		return anim; // dojo.Animation
	};

	fxg.animateFont = function(/*Object*/ args){
		// summary:
		//		Returns an animation which will change font properties over time.
		// args:
		//		an object defining the animation setting.
		// example:
		//	|	gfx.animateFont{{
		//	|		shape: shape,
		//	|		duration: 500,
		//	|		variant: {values: ["normal", "small-caps"]},
		//	|		size:  {end: 10, units: "pt"}
		//	|	}).play();
		if(!args.easing){ args.easing = fx._defaultEasing; }
		var anim = new fx.Animation(args), shape = args.shape, font;
		Hub.connect(anim, "beforeBegin", anim, function(){
			font = shape.getFont();
			var prop = args.style, values = {}, value, start, end;
			if(prop && prop.values){
				values.style = new InterpolValues(prop.values);
			}
			prop = args.variant;
			if(prop && prop.values){
				values.variant = new InterpolValues(prop.values);
			}
			prop = args.weight;
			if(prop && prop.values){
				values.weight = new InterpolValues(prop.values);
			}
			prop = args.family;
			if(prop && prop.values){
				values.family = new InterpolValues(prop.values);
			}
			prop = args.size;
			if(prop && prop.units){
				start = parseFloat(prop.start ? prop.start : (shape.font && shape.font.size || "0"));
				end = parseFloat(prop.end ? prop.end : (shape.font && shape.font.size || "0"));
				values.size = new InterpolUnit(start, end, prop.units);
			}
			this.curve = new InterpolObject(values, font);
		});
		Hub.connect(anim, "onAnimate", shape, "setFont");
		return anim; // dojo.Animation
	};

	fxg.animateTransform = function(/*Object*/ args){
		// summary:
		//		Returns an animation which will change transformation over time.
		// args:
		//		an object defining the animation setting.
		// example:
		//	|	gfx.animateTransform{{
		//	|		shape: shape,
		//	|		duration: 500,
		//	|		transform: [
		//	|			{name: "translate", start: [0, 0], end: [200, 200]},
		//	|			{name: "original"}
		//	|		]
		//	|	}).play();
		if(!args.easing){ args.easing = fx._defaultEasing; }
		var anim = new fx.Animation(args), shape = args.shape, original;
		Hub.connect(anim, "beforeBegin", anim, function(){
			original = shape.getTransform();
			this.curve = new InterpolTransform(args.transform, original);
		});
		Hub.connect(anim, "onAnimate", shape, "setTransform");
		if(g.renderer === "svg" && has("ie") >= 10){
			// fix http://bugs.dojotoolkit.org/ticket/16879
			var handlers = [
					Hub.connect(anim, "onBegin", anim, function(){
						var parent = shape.getParent();
						while(parent && parent.getParent){
							parent = parent.getParent();
						}
						if(parent){
							shape.__svgContainer = parent.rawNode.parentNode;
						}
					}),
					Hub.connect(anim, "onAnimate", anim, function(){
						try{
							if(shape.__svgContainer){
								var ov = shape.__svgContainer.style.visibility;
								shape.__svgContainer.style.visibility = "visible";
								var pokeNode = shape.__svgContainer.offsetHeight;
								shape.__svgContainer.style.visibility = ov;
							}
						}catch(e){}
					}),
					Hub.connect(anim, "onEnd", anim, function(){
						arr.forEach(handlers, Hub.disconnect);
						if(shape.__svgContainer){
							var ov = shape.__svgContainer.style.visibility;
							var sn = shape.__svgContainer;
							shape.__svgContainer.style.visibility = "visible";
							setTimeout(function(){
								try{
									sn.style.visibility = ov;
									sn = null;
								}catch(e){}
							},100);
						}
						delete shape.__svgContainer;
					})
				];
		}
		return anim; // dojo.Animation
	};
	
	return fxg;
});
