define(["dojo", "../../util/oo", "../../manager/_registry", "../../util/positioning", "../Arrow"],
function(dojo, oo, registry, positioning, Arrow){

var Vector = oo.declare(
	Arrow,
	function(options){
		this.minimumSize = this.style.arrows.length;
		this.addShadow({size:3, mult:2});
	},
	{
		// summary:
		//		Creates a Vector Stencil.
		// description:
		//		Generally the same as an arrow, except that the arrow
		//		head is only at the end. There is additionaly functionality
		//		to allow for a 'zero vector' - one with no length.

		draws:true,
		type:"dojox.drawing.tools.custom.Vector",
		minimumSize:30,
		showAngle:true,
		
		
		
		changeAxis: function(cosphi){
			// summary:
			//		Converts a vector to and from the z axis.
			//		If passed a cosphi value that is used to set
			//		the axis, otherwise it is the opp of what it is.
			cosphi = cosphi!==undefined?cosphi:this.style.zAxis? 0 : 1;
			if(cosphi == 0){
				this.style.zAxis = false;
				this.data.cosphi = 0;
			}else{
				this.style.zAxis = true;
				var p = this.points;
				var pt = this.zPoint();
				this.setPoints([
					{x:p[0].x, y:p[0].y},
					{x:pt.x, y:pt.y}
				]);
			}
			this.render();
		},
		
		_createZeroVector: function(shp, d, sty){
			// summary:
			//		Special creation function for the zero-vector shape

			var s = shp=="hit" ? this.minimumSize : this.minimumSize/6;
			var f = shp=="hit" ? sty.fill : null;
			d = {
				cx:this.data.x1,
				cy:this.data.y1,
				rx:s,
				ry:s
			};
			
			this.remove(this[shp]);
			this[shp] = this.container.createEllipse(d)
				.setStroke(sty)
				.setFill(f);
			this.util.attr(this[shp], "drawingType", "stencil");
		},
		
		_create: function(/*String*/shp, /*StencilData*/d, /*Object*/sty){
			// summary:
			//		Creates a dojox.gfx.shape based on passed arguments.
			//		Can be called many times by implementation to create
			//		multiple shapes in one stencil.

			this.remove(this[shp]);
			this[shp] = this.container.createLine(d)
				.setStroke(sty);
			this._setNodeAtts(this[shp]);
		},
		
		onDrag: function(/*EventObject*/obj){
			// summary:
			//		See stencil._Base.onDrag

			if(this.created){ return; }
			
			var x1 = obj.start.x,
				y1 = obj.start.y,
				x2 = obj.x,
				y2 = obj.y;
			
			if(this.keys.shift && !this.style.zAxis){
				var pt = this.util.snapAngle(obj, 45/180);
				x2 = pt.x;
				y2 = pt.y;
			}
			
			if(this.keys.alt){
				// FIXME:
				// should double the length of the line
				// FIXME:
				//	if alt dragging past ZERO it seems to work
				//	but select/deselect shows bugs
				var dx = x2>x1 ? ((x2-x1)/2) : ((x1-x2)/-2);
				var dy = y2>y1 ? ((y2-y1)/2) : ((y1-y2)/-2);
				x1 -= dx;
				x2 -= dx;
				y1 -= dy;
				y2 -= dy;
			}
			
			if(this.style.zAxis){
				var pts = this.zPoint(obj);
				x2 = pts.x;
				y2 = pts.y;
			}
			
			this.setPoints([
				{x:x1, y:y1},
				{x:x2, y:y2}
			]);
			this.render();
		},
		
		onTransform: function(/* ? manager.Anchor */anchor){
			// summary:
			//		Called from anchor point mouse drag
			//		also called from plugins.Pan.checkBounds
			if(!this._isBeingModified){
				this.onTransformBegin();
			}
			// this is not needed for anchor moves, but it
			// is for stencil move:
			
			this.setPoints(this.points);
			this.render();
		},
		
		anchorConstrain: function(x, y){
			// summary:
			//		Called from anchor point mouse drag
			if(!this.style.zAxis){ return null; }
			var radians = this.style.zAngle*Math.PI/180;
			//Constrain to angle
			var test = x<0 ? x>-y : x<-y;
			var dx = test ? x : -y/Math.tan(radians);
			var dy = !test ? y : -Math.tan(radians)*x;
			return {x:dx, y:dy}
		},
		
		zPoint: function(obj){
			// summary:
			//		Takes any point and converts it to
			//		be on the z-axis.
			if(obj===undefined){
				if(!this.points[0]){ return null; };
				var d = this.pointsToData();
				obj = {
					start:{
						x:d.x1,
						y:d.y1
					},
					x:d.x2,
					y:d.y2
				};
			}
			var radius = this.util.length(obj);
			var angle = positioning.angle(obj.start, obj);
			angle<0 ? angle = 360 + angle : angle;
			
			angle = angle > 135 && angle < 315 ? this.style.zAngle : this.util.oppAngle(this.style.zAngle);
			
			return this.util.pointOnCircle(obj.start.x, obj.start.y, radius, angle);
		},
		
		pointsToData: function(p){
			// summary:
			//		Converts points to data
			p = p || this.points;
			var cosphi = 0;
			var obj = {start:{x:p[0].x, y:p[0].y}, x:p[1].x, y:p[1].y};
			if(this.style.zAxis && (this.util.length(obj)>this.minimumSize)){
				
				var angle = positioning.angle(obj.start, obj);
				angle<0 ? angle = 360 + angle : angle;
				cosphi = angle > 135 && angle < 315 ? 1 : -1;
			}
			this.data = {
				x1: p[0].x,
				y1: p[0].y,
				x2: p[1].x,
				y2: p[1].y,
				cosphi: cosphi
			};
			return this.data;
		},
		
		dataToPoints: function(o){
			// summary:
			//		Converts data to points.
			o = o || this.data;
			if(o.radius || o.angle){
				// instead of using x1,x2,y1,y1,
				// it's been set as x,y,angle,radius
				var cosphi = 0;
				var pt = this.util.pointOnCircle(o.x,o.y,o.radius,o.angle);
				if(this.style.zAxis || (o.cosphi && o.cosphi!=0)){
					this.style.zAxis = true;
					cosphi = o.angle > 135 && o.angle < 315 ? 1 : -1;
				}
				//console.log(" ---- pts:", pt.x, pt.y);
				this.data = o = {
					x1:o.x,
					y1:o.y,
					x2:pt.x,
					y2:pt.y,
					cosphi:cosphi
				}
				
			}
			this.points = [
				{x:o.x1, y:o.y1},
				{x:o.x2, y:o.y2}
			];
			return this.points;
		},
		
		render: function(){
			// summary:
			//		Renders the 'hit' object (the shape used for an expanded
			//		hit area and for highlighting) and the'shape' (the actual
			//		display object). Additionally checks if Vector should be
			//		drawn as an arrow or a circle (zero-length)

			this.onBeforeRender(this);
			if(this.getRadius() >= this.minimumSize){
				this._create("hit", this.data, this.style.currentHit);
				this._create("shape", this.data, this.style.current);
			
			}else{
				this.data.cosphi = 0;
				this._createZeroVector("hit", this.data, this.style.currentHit);
				this._createZeroVector("shape", this.data, this.style.current);
			}
		},
		onUp: function(/*EventObject*/obj){
			// summary:
			//		See stencil._Base.onUp

			if(this.created || !this._downOnCanvas){ return; }
			this._downOnCanvas = false;
			//Default vector for single click
			if(!this.shape){
				var d = 100;
				obj.start.x = this.style.zAxis ? obj.start.x + d : obj.start.x;
				obj.y = obj.y+d;
				this.setPoints([
					{x:obj.start.x, y:obj.start.y},
					{x:obj.x, y:obj.y}
				]);
				this.render();
			}
			
			// When within minimum size this sets zero vector length to zero
			if(this.getRadius()<this.minimumSize){
				var p = this.points;
				this.setPoints([
					{x:p[0].x, y:p[0].y},
					{x:p[0].x, y:p[0].y}
				]);
			}else{
				//SnapAngle fails for the zero length vector
				var p = this.points;
				var pt = this.style.zAxis ? this.zPoint(obj) : this.util.snapAngle(obj, this.angleSnap/180);
				this.setPoints([
					{x:p[0].x, y:p[0].y},
					{x:pt.x, y:pt.y}
				]);
			}
			this.renderedOnce = true;
			this.onRender(this);
		}
	}
	
);

dojo.setObject("dojox.drawing.tools.custom.Vector", Vector);
Vector.setup = {
	// summary:
	//		See stencil._Base ToolsSetup

	name:"dojox.drawing.tools.custom.Vector",
	tooltip:"Vector Tool",
	iconClass:"iconVector"
};

//TODO
if(0 && dojox.drawing.defaults.zAxisEnabled){
	dojox.drawing.tools.custom.Vector.setup.secondary = {
		// summary:
		//		Creates a secondary tool for the Vector Stencil.
		// description:
		//		See Toolbar.js makeButtons function.  The toolbar
		//		checks Vector.setup for a secondary tool and requires
		//		name, label, and funct.  Currently it doesn't accept icon
		//		and only uses text from label for the button.  Funct is the
		//		function that fires when the button is clicked.
		//
		//		Setup and postSetup are optional
		//		and allow tool specific functions to be added to the
		//		Toolbar object as if they were written there.
		name: "vectorSecondary",
		label: "z-axis",
		funct: function(button){
			button.selected ? this.zDeselect(button) : this.zSelect(button);
			
			var stencils = this.drawing.stencils.selectedStencils;
			for(var nm in stencils){
				if(stencils[nm].shortType == "vector" && (stencils[nm].style.zAxis != dojox.drawing.defaults.zAxis)){
					var s = stencils[nm];
					s.changeAxis();
					//Reset anchors
					if(s.style.zAxis){ s.deselect(); s.select(); }
				}
			}
			
		},
		setup: function(){
			// summary:
			//		All functions, variables and connections defined here
			//		are treated as if they were added directly to toolbar.
			//		They are included with the tool because secondary buttons
			//		are tool specific.
			var zAxis = dojox.drawing.defaults.zAxis;
			this.zSelect = function(button){
				if(!button.enabled){ return; }
				zAxis = true;
				dojox.drawing.defaults.zAxis = true;
				button.select();
				this.vectorTest();
				this.zSelected = button;
			};
			this.zDeselect = function(button){
				if(!button.enabled){ return; }
				zAxis = false;
				dojox.drawing.defaults.zAxis = false;
				button.deselect();
				this.vectorTest();
				this.zSelected = null;
			};
			this.vectorTest = function(){
				dojo.forEach(this.buttons, function(b){
					if(b.toolType=="vector" && b.selected){
						this.drawing.currentStencil.style.zAxis = zAxis;
					}
				},this);
			};
			dojo.connect(this, "onRenderStencil", this, function(){ if(this.zSelected){ this.zDeselect(this.zSelected)}});
			var c = dojo.connect(this.drawing, "onSurfaceReady", this, function(){
				dojo.disconnect(c);
				dojo.connect(this.drawing.stencils, "onSelect", this, function(stencil){
					if(stencil.shortType == "vector"){
						if(stencil.style.zAxis){
							//If stencil is on the z-axis, update button to reflect that
							dojo.forEach(this.buttons, function(b){
								if(b.toolType=="vectorSecondary"){
									this.zSelect(b);
								}
							},this);
							
						}else{
							//Update button to not be z-axis
							dojo.forEach(this.buttons, function(b){
								if(b.toolType=="vectorSecondary"){
									this.zDeselect(b);
								}
							},this);
						}
					};
				});
			});
		},
		postSetup: function(btn){
			// summary:
			//		Depending on the secondary tool, it may need
			//		extra functionality for some of the basic functions.
			//		Post is passed the button so those connections can
			//		be made.
			dojo.connect(btn, "enable", function(){ dojox.drawing.defaults.zAxisEnabled = true; });
			dojo.connect(btn, "disable", function(){ dojox.drawing.defaults.zAxisEnabled = false; });
		}
	};
}
registry.register(Vector.setup, "tool");
return Vector;
});
