dojo.provide("dojo.fx");
dojo.require("dojo.fx.Toggler");
/*=====
dojo.fx = {
	// summary: Effects library on top of Base animations
};
=====*/
(function(){
	
	var d = dojo, 
		_baseObj = {
			_fire: function(evt, args){
				if(this[evt]){
					this[evt].apply(this, args||[]);
				}
				return this;
			}
		};

	var _chain = function(animations){
		this._index = -1;
		this._animations = animations||[];
		this._current = this._onAnimateCtx = this._onEndCtx = null;

		this.duration = 0;
		d.forEach(this._animations, function(a){
			this.duration += a.duration;
			if(a.delay){ this.duration += a.delay; }
		}, this);
	};
	d.extend(_chain, {
		_onAnimate: function(){
			this._fire("onAnimate", arguments);
		},
		_onEnd: function(){
			d.disconnect(this._onAnimateCtx);
			d.disconnect(this._onEndCtx);
			this._onAnimateCtx = this._onEndCtx = null;
			if(this._index + 1 == this._animations.length){
				this._fire("onEnd");
			}else{
				// switch animations
				this._current = this._animations[++this._index];
				this._onAnimateCtx = d.connect(this._current, "onAnimate", this, "_onAnimate");
				this._onEndCtx = d.connect(this._current, "onEnd", this, "_onEnd");
				this._current.play(0, true);
			}
		},
		play: function(/*int?*/ delay, /*Boolean?*/ gotoStart){
			if(!this._current){ this._current = this._animations[this._index = 0]; }
			if(!gotoStart && this._current.status() == "playing"){ return this; }
			var beforeBegin = d.connect(this._current, "beforeBegin", this, function(){
					this._fire("beforeBegin");
				}),
				onBegin = d.connect(this._current, "onBegin", this, function(arg){
					this._fire("onBegin", arguments);
				}),
				onPlay = d.connect(this._current, "onPlay", this, function(arg){
					this._fire("onPlay", arguments);
					d.disconnect(beforeBegin);
					d.disconnect(onBegin);
					d.disconnect(onPlay);
				});
			if(this._onAnimateCtx){
				d.disconnect(this._onAnimateCtx);
			}
			this._onAnimateCtx = d.connect(this._current, "onAnimate", this, "_onAnimate");
			if(this._onEndCtx){
				d.disconnect(this._onEndCtx);
			}
			this._onEndCtx = d.connect(this._current, "onEnd", this, "_onEnd");
			this._current.play.apply(this._current, arguments);
			return this;
		},
		pause: function(){
			if(this._current){
				var e = d.connect(this._current, "onPause", this, function(arg){
						this._fire("onPause", arguments);
						d.disconnect(e);
					});
				this._current.pause();
			}
			return this;
		},
		gotoPercent: function(/*Decimal*/percent, /*Boolean?*/ andPlay){
			this.pause();
			var offset = this.duration * percent;
			this._current = null;
			d.some(this._animations, function(a){
				if(a.duration <= offset){
					this._current = a;
					return true;
				}
				offset -= a.duration;
				return false;
			});
			if(this._current){
				this._current.gotoPercent(offset / this._current.duration, andPlay);
			}
			return this;
		},
		stop: function(/*boolean?*/ gotoEnd){
			if(this._current){
				if(gotoEnd){
					for(; this._index + 1 < this._animations.length; ++this._index){
						this._animations[this._index].stop(true);
					}
					this._current = this._animations[this._index];
				}
				var e = d.connect(this._current, "onStop", this, function(arg){
						this._fire("onStop", arguments);
						d.disconnect(e);
					});
				this._current.stop();
			}
			return this;
		},
		status: function(){
			return this._current ? this._current.status() : "stopped";
		},
		destroy: function(){
			if(this._onAnimateCtx){ d.disconnect(this._onAnimateCtx); }
			if(this._onEndCtx){ d.disconnect(this._onEndCtx); }
		}
	});
	d.extend(_chain, _baseObj);

	dojo.fx.chain = function(/*dojo._Animation[]*/ animations){
		// summary: Chain a list of dojo._Animation s to run in sequence
		// example:
		//	|	dojo.fx.chain([
		//	|		dojo.fadeIn({ node:node }),
		//	|		dojo.fadeOut({ node:otherNode })
		//	|	]).play();
		//
		return new _chain(animations) // dojo._Animation
	};

	var _combine = function(animations){
		this._animations = animations||[];
		this._connects = [];
		this._finished = 0;

		this.duration = 0;
		d.forEach(animations, function(a){
			var duration = a.duration;
			if(a.delay){ duration += a.delay; }
			if(this.duration < duration){ this.duration = duration; }
			this._connects.push(d.connect(a, "onEnd", this, "_onEnd"));
		}, this);
		
		this._pseudoAnimation = new d._Animation({curve: [0, 1], duration: this.duration});
		var self = this;
		d.forEach(["beforeBegin", "onBegin", "onPlay", "onAnimate", "onPause", "onStop"], 
			function(evt){
				self._connects.push(d.connect(self._pseudoAnimation, evt,
					function(){ self._fire(evt, arguments); }
				));
			}
		);
	};
	d.extend(_combine, {
		_doAction: function(action, args){
			d.forEach(this._animations, function(a){
				a[action].apply(a, args);
			});
			return this;
		},
		_onEnd: function(){
			if(++this._finished == this._animations.length){
				this._fire("onEnd");
			}
		},
		_call: function(action, args){
			var t = this._pseudoAnimation;
			t[action].apply(t, args);
		},
		play: function(/*int?*/ delay, /*Boolean?*/ gotoStart){
			this._finished = 0;
			this._doAction("play", arguments);
			this._call("play", arguments);
			return this;
		},
		pause: function(){
			this._doAction("pause", arguments);
			this._call("pause", arguments);
			return this;
		},
		gotoPercent: function(/*Decimal*/percent, /*Boolean?*/ andPlay){
			var ms = this.duration * percent;
			d.forEach(this._animations, function(a){
				a.gotoPercent(a.duration < ms ? 1 : (ms / a.duration), andPlay);
			});
			this._call("gotoPercent", arguments);
			return this;
		},
		stop: function(/*boolean?*/ gotoEnd){
			this._doAction("stop", arguments);
			this._call("stop", arguments);
			return this;
		},
		status: function(){
			return this._pseudoAnimation.status();
		},
		destroy: function(){
			d.forEach(this._connects, dojo.disconnect);
		}
	});
	d.extend(_combine, _baseObj);

	dojo.fx.combine = function(/*dojo._Animation[]*/ animations){
		// summary: Combine an array of `dojo._Animation`s to run in parallel
		//
		// description:
		//		Combine an array of `dojo._Animation`s to run in parallel, 
		//		providing a new `dojo._Animation` instance encompasing each
		//		animation, firing standard animation events.
		//
		// example:
		//	|	dojo.fx.combine([
		//	|		dojo.fadeIn({ node:node }),
		//	|		dojo.fadeOut({ node:otherNode })
		//	|	]).play();
		//
		// example:
		//	When the longest animation ends, execute a function:
		//	| 	var anim = dojo.fx.combine([
		//	|		dojo.fadeIn({ node: n, duration:700 }),
		//	|		dojo.fadeOut({ node: otherNode, duration: 300 })
		//	|	]);
		//	|	dojo.connect(anim, "onEnd", function(){
		//	|		// overall animation is done.
		//	|	});
		//	|	anim.play(); // play the animation
		//
		return new _combine(animations); // dojo._Animation
	};

	dojo.fx.wipeIn = function(/*Object*/ args){
		// summary:
		//		Returns an animation that will expand the
		//		node defined in 'args' object from it's current height to
		//		it's natural height (with no scrollbar).
		//		Node must have no margin/border/padding.
		args.node = d.byId(args.node);
		var node = args.node, s = node.style, o;

		var anim = d.animateProperty(d.mixin({
			properties: {
				height: {
					// wrapped in functions so we wait till the last second to query (in case value has changed)
					start: function(){
						// start at current [computed] height, but use 1px rather than 0
						// because 0 causes IE to display the whole panel
						o = s.overflow;
						s.overflow="hidden";
						if(s.visibility=="hidden"||s.display=="none"){
							s.height="1px";
							s.display="";
							s.visibility="";
							return 1;
						}else{
							var height = d.style(node, "height");
							return Math.max(height, 1);
						}
					},
					end: function(){
						return node.scrollHeight;
					}
				}
			}
		}, args));

		d.connect(anim, "onEnd", function(){ 
			s.height = "auto";
			s.overflow = o;
		});

		return anim; // dojo._Animation
	}

	dojo.fx.wipeOut = function(/*Object*/ args){
		// summary:
		//		Returns an animation that will shrink node defined in "args"
		//		from it's current height to 1px, and then hide it.
		var node = args.node = d.byId(args.node), s = node.style, o;
		
		var anim = d.animateProperty(d.mixin({
			properties: {
				height: {
					end: 1 // 0 causes IE to display the whole panel
				}
			}
		}, args));

		d.connect(anim, "beforeBegin", function(){
			o = s.overflow;
			s.overflow = "hidden";
			s.display = "";
		});
		d.connect(anim, "onEnd", function(){
			s.overflow = o;
			s.height = "auto";
			s.display = "none";
		});

		return anim; // dojo._Animation
	}

	dojo.fx.slideTo = function(/*Object?*/ args){
		// summary:
		//		Returns an animation that will slide "node" 
		//		defined in args Object from its current position to
		//		the position defined by (args.left, args.top).
		// example:
		//	|	dojo.fx.slideTo({ node: node, left:"40", top:"50", unit:"px" }).play()

		var node = args.node = d.byId(args.node), 
			top = null, left = null;

		var init = (function(n){
			return function(){
				var cs = d.getComputedStyle(n);
				var pos = cs.position;
				top = (pos == 'absolute' ? n.offsetTop : parseInt(cs.top) || 0);
				left = (pos == 'absolute' ? n.offsetLeft : parseInt(cs.left) || 0);
				if(pos != 'absolute' && pos != 'relative'){
					var ret = d.coords(n, true);
					top = ret.y;
					left = ret.x;
					n.style.position="absolute";
					n.style.top=top+"px";
					n.style.left=left+"px";
				}
			};
		})(node);
		init();

		var anim = d.animateProperty(d.mixin({
			properties: {
				top: args.top || 0,
				left: args.left || 0
			}
		}, args));
		d.connect(anim, "beforeBegin", anim, init);

		return anim; // dojo._Animation
	}

})();