/*
Copyright (c) 2006 Lukasz Szajkowski <http://www.szajkowski.com/>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
*/

var Zorya = {
	divFactory : function() {
		if (!Zorya._divFactory) throw "Zorya divFactory module isn't loaded";
		return Zorya._divFactory
	},	

	debug : function() {
		if (!Zorya._debug) throw "Zorya debug module isn't loaded";
		return Zorya._debug
	},
	
	Graph : function(id, name, dragPar, colorPar, vertexesStruct, edgesStruct) {
		if (!Zorya._Graph) {
			var msg = "Zorya Graph class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._Graph(id, name, dragPar, colorPar, vertexesStruct, edgesStruct);
	},
	
	GraphView : function(drag, color, graphModel) {
		if (!Zorya._GraphView) {
			var msg = "Zorya GraphView class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._GraphView(drag, color, graphModel);
	},
	
	GraphModel : function(id, name) {
		if (!Zorya._GraphModel) {
			var msg = "Zorya GraphModel class isn't loaded";
			Zorya.debug().alert(msg, 1);	
			throw msg;
		}
		return new Zorya._GraphModel(id, name);
	},
				
	Vertex : function(vertexModel, vertexView) {
		if (!Zorya._Vertex) {
			var msg = "Zorya Vertex class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._Vertex(vertexModel, vertexView);
	},

	VertexView : function (drag, color, vertexModel) {
	//Zorya.debug().alert('test', 1);
		if (!Zorya._VertexView) {
			var msg = "Zorya VertexView class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._VertexView(drag, color, vertexModel);
	},

	VertexModel : function(struct) {
		if (!Zorya._VertexModel) {
			var msg = "Zorya VertexModel class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._VertexModel(struct);
	},
	
	Edge : function(edgeModel, edgeView) {
		if (!Zorya._Edge) {
			var msg = "Zorya Edge class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._Edge(edgeModel, edgeView);
	},
	
	EdgeView : function(drag, color, edgeModel, vertexViewArray) {
		if (!Zorya._EdgeView) {
			var msg = "Zorya EdgeView class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._EdgeView(drag, color, edgeModel, vertexViewArray);
	},
	
	EdgeModel : function (struct, vertexArray) {
		if (!Zorya._EdgeModel) {
			var msg = "Zorya EdgeModel class isn't loaded";
			Zorya.debug().alert(msg, 1);			
			throw msg;			
		}
		return new Zorya._EdgeModel(struct, vertexArray);
	}
} 

Zorya._divFactory = {
	printDiv : function(dx, dy, dw, txt, newdiv, bgcolor) {
		if(NS4) {
			l = document.layers[newdiv];
			l.document.open("text/html");
			l.document.write(txt);
			l.document.close();
			l.document.bgColor  = bgcolor;
			l.width             = dw;
			l.left              = dx;
			l.top               = dy;
		} else if(IE4) {
			l = document.getElementById(newdiv);
			l.style.backgroundColor = bgcolor;
			l.innerHTML             = txt;
			l.style.pixelWidth      = dw;
			l.style.pixelLeft       = dx;
			l.style.pixelTop        = dy;
		} else if(NS6) {
			l = document.getElementById(newdiv);
			rng = document.createRange();
			rng.setStartBefore(l);
			htmlFrag = rng.createContextualFragment(txt);
			
			while (l.hasChildNodes()) {
				l.removeChild(l.lastChild);
			}
			l.appendChild(htmlFrag);
			l.style.border          = 1;
			l.style.backgroundColor = bgcolor;
			l.style.left            = dx;
			l.style.top             = dy;
		}
  		return true;
	},
	
	/** 
	 * The method appends txt to div content
	 */
	appendToDiv : function(txt, div) {
		if(NS4) {
			l = document.layers[div];
			var oldText; 
			l.document.open("text/html");
			oldText = l.document.read();
			l.document.close();
			var newText = oldText + txt;			
			l.document.open("text/html");
			l.document.write(newText);
			l.document.close();
		} else if(IE4) {
			l = document.getElementById(div);
			l.innerHTML             = l.innerHTML + txt;
		} else if(NS6) {
			l = document.getElementById(div);
			rng = document.createRange();
			rng.setStartBefore(l);
			htmlFrag = rng.createContextualFragment(txt);
			l.appendChild(htmlFrag);
		}
	},
	
	/** The method returns div in Netscape 4 */
	getDivForN4 : function (obj,name) {
		var x = obj.layers;
		var foundLayer;
		for (var i = 0;i < x.length;i++) {
			if (x[i].id == name) {
			 	foundLayer = x[i];
			} else if (x[i].layers.length) {
				var tmp = getObjNN4(x[i],name);
			}
			if (tmp) { 
				foundLayer = tmp;
			}
		}
		return foundLayer;
	}	
	
}