/**
 * NicEdit Instance
 * This class creates an editable area out of any block level node and converting textarea nodes into editable areas. Instances of this class use the contentEditable attribute and besides textareas do not modify the orginal node.
 * @author: Brian Kirchoff
 * @requires: nicCore
 * @version 0.9
 */
 
var nicEditorInstance = bkClass.extend({
	isSelected : false,
	
	construct : function(e,options,nicEditor) {
		this.ne = nicEditor;
		this.elm = this.e = e;
		this.options = options || {};
		
    newX = e.clientWidth || parseInt(e.getStyle('width'));
		newY = parseInt(e.getStyle('height')) || e.clientHeight;
		this.initialHeight = newY-8;
		
		var isTextarea = (e.nodeName.toLowerCase() == "textarea");
		if(isTextarea || this.options.hasPanel) {
			var ie7s = (bkLib.isMSIE && !((typeof document.body.style.maxHeight != "undefined") && document.compatMode == "CSS1Compat"))
			var s = {width: newX+'px', border : '1px solid #ccc', borderTop : 0, overflowY : 'auto', overflowX: 'hidden' };
			s[(ie7s) ? 'height' : 'maxHeight'] = (this.ne.options.maxHeight) ? this.ne.options.maxHeight+'px' : null;
			this.editorContain = new bkElement('DIV').setStyle(s).appendBefore(e);
			var editorElm = new bkElement('DIV').setStyle({width : (newX-8)+'px', margin: '4px', minHeight : newY+'px'}).addClass('main').appendTo(this.editorContain);

			e.setStyle({display : 'none'});
				
			editorElm.innerHTML = e.innerHTML;		
			if(isTextarea) {
				editorElm.setContent(e.value);
				this.copyElm = e;
				var f = e.parentTag('FORM');
				if(f) { bkLib.addEvent( f, 'submit', this.saveContent.closure(this)); }
			}
			editorElm.setStyle((ie7s) ? {height : newY+'px'} : {overflow: 'hidden'});
			this.elm = editorElm;	
		}
		this.ne.addEvent('blur',this.blur.closure(this));

		this.init();
		this.blur();
	},
	
	init : function() {
		this.elm.setAttribute('contentEditable','true');	
		if(this.getContent() == "") {
			this.setContent('<br />');
		}
		this.instanceDoc = document.defaultView;
		this.elm.addEvent('mousedown',this.selected.closureListener(this)).addEvent('keypress',this.keyDown.closureListener(this)).addEvent('focus',this.selected.closure(this)).addEvent('blur',this.blur.closure(this)).addEvent('keyup',this.selected.closure(this));
		this.ne.fireEvent('add',this);
	},
	
	remove : function() {
		this.saveContent();
		if(this.copyElm || this.options.hasPanel) {
			this.editorContain.remove();
			this.e.setStyle({'display' : 'block'});
			this.ne.removePanel();
		}
		this.disable();
		this.ne.fireEvent('remove',this);
	},
	
	disable : function() {
		this.elm.setAttribute('contentEditable','false');
	},
	
	getSel : function() {
		return (window.getSelection) ? window.getSelection() : document.selection;	
	},
	
	getRng : function() {
		var s = this.getSel();
		if(!s) { return null; }
		return (s.rangeCount > 0) ? s.getRangeAt(0) : s.createRange();
	},
	
	selRng : function(rng,s) {
		if(window.getSelection) {
			s.removeAllRanges();
			s.addRange(rng);
		} else {
			rng.select();
		}
	},
	
	selElm : function() {
		var r = this.getRng();
		if(r.startContainer) {
			var contain = r.startContainer;
			if(r.cloneContents().childNodes.length == 1) {
				for(var i=0;i<contain.childNodes.length;i++) {
					var rng = contain.childNodes[i].ownerDocument.createRange();
					rng.selectNode(contain.childNodes[i]);					
					if(r.compareBoundaryPoints(Range.START_TO_START,rng) != 1 && 
						r.compareBoundaryPoints(Range.END_TO_END,rng) != -1) {
						return $BK(contain.childNodes[i]);
					}
				}
			}
			return $BK(contain);
		} else {
			return $BK((this.getSel().type == "Control") ? r.item(0) : r.parentElement());
		}
	},
	
	saveRng : function() {
		this.savedRange = this.getRng();
		this.savedSel = this.getSel();
	},
	
	restoreRng : function() {
		if(this.savedRange) {
			this.selRng(this.savedRange,this.savedSel);
		}
	},
	
	keyDown : function(e,t) {
		if(e.ctrlKey) {
			this.ne.fireEvent('key',this,e);
		}
	},
	
	selected : function(e,t) {
		if(!t) {t = this.selElm()}
		if(!e.ctrlKey) {
			var selInstance = this.ne.selectedInstance;
			if(selInstance != this) {
				if(selInstance) {
					this.ne.fireEvent('blur',selInstance,t);
				}
				this.ne.selectedInstance = this;	
				this.ne.fireEvent('focus',selInstance,t);
			}
			this.ne.fireEvent('selected',selInstance,t);
			this.isFocused = true;
			this.elm.addClass('selected');
		}
		return false;
	},
	
	blur : function() {
		this.isFocused = false;
		this.elm.removeClass('selected');
	},
	
	saveContent : function() {
		if(this.copyElm || this.options.hasPanel) {
			this.ne.fireEvent('save',this);
			(this.copyElm) ? this.copyElm.value = this.getContent() : this.e.innerHTML = this.getContent();
		}	
	},
	
	getElm : function() {
		return this.elm;
	},
	
	getContent : function() {
		this.content = this.getElm().innerHTML;
		this.ne.fireEvent('get',this);
		return this.content;
	},
	
	setContent : function(e) {
		this.content = e;
		this.ne.fireEvent('set',this);
		this.elm.innerHTML = this.content;	
	},
	
	nicCommand : function(cmd,args) {
		document.execCommand(cmd,false,args);
	}		
});