// DOM MANIPULATION TO DYNAMICALLY RENDER COMMENTS SCOPES IN TEXT 

// cf. http://www.quirksmode.org/dom/w3c_core.html#nodemanipulation (informative!)

// classes :
// c-s is for 'textnode wrapper span'
// c-c is a comment marker

paintCommentScope = function(comment) {
	if (comment.reply_to_id == null) {
		var selection = { 	'start' : { 'elt' : document.getElementById("sv_"+comment['start_wrapper']), 'offset' : comment['start_offset'] },
							'end' : { 'elt' : document.getElementById("sv_"+comment['end_wrapper']), 'offset' : comment['end_offset'] }
						} ;
		if (document.getElementById("sv_"+comment['start_wrapper'])== null)
			warn_server({'from':'paintCommentScope', 'start_wrapper':comment['start_wrapper']}) ;
		else {
			if (document.getElementById("sv_"+comment['end_wrapper'])== null)
				warn_server({'from':'paintCommentScope', 'end_wrapper':comment['end_wrapper']}) ;
			else {
			    selection['start'] = _convertSelectionFromCSToCC(selection['start']) ;
			    selection['end'] = _convertSelectionFromCSToCC(selection['end']) ;
			
			    renderComment(selection, comment['id']) ;
			}
		}
	}
} ;

getCommentIdsFromClasses = function (elt) {
	var commentIds = [] ;
	var classes = elt['className'].split(" ") ;
	for (var i = 0, ilen = classes.length ; i < ilen ; i++) {
		if (classes[i].indexOf('c-id-') == 0) {
			commentIds.push(parseInt(classes[i].substring('c-id-'.length))) ;
		}
	}
	return commentIds ;
} ;

renderComment = function (selection, commentId) {
	var startOffset = selection['start']['offset'] ;
	var endOffset = selection['end']['offset'] ;
	var startElt = selection['start']['elt'] ;
	var endElt = selection['end']['elt'] ;

	
    if ((startElt != null) && (endElt != null) && _getTextNodeContent(startElt) != '' && _getTextNodeContent(endElt) != ''){
// log('startElt.id : ' + startElt.id) ;
// log('endElt.id : ' + endElt.id) ;
//    	log('startElt.innerHTML : ' + startElt.innerHTML) ;
//    	log('endElt.innerHTML : ' + endElt.innerHTML) ;
	    markWholeNodesAsComments(startElt, endElt, commentId) ;
	    markEndsAsComments(startElt, startOffset, endElt, endOffset, commentId) ;
	}
} ;

markWholeNodesAsComments = function (startElt, endElt, commentId) {
    var commonAncestor = _findCommonAncestor(startElt, endElt) ;
    _dynSpanToAnc(startElt, commonAncestor, commentId, false) ;
    
    _dynSpanToAnc(endElt, commonAncestor, commentId, true) ;

    _dynSpanInBetween(commonAncestor, startElt, endElt, commentId) ;
} ;

_setTextNodeContent = function(txtNodeParent, contentString) {
    CY.DOM.setText(txtNodeParent, contentString);
} ;

_getTextNodeContent = function(txtNodeParent) {
    return CY.DOM.getText(txtNodeParent);
} ;

markEndsAsComments = function(startElt, startOffset, endElt, endOffset, commentId) {
	
//	alert('starting with: ' + startElt.childNodes.length + 'and a length of : ' + startElt.firstChild.data.length) ; 
//	alert('2 and a length of : ' + CY.DOM.getText(startElt).length) ; 

	var beforeStart = _getTextNodeContent(startElt).substring(0, startOffset) ; 
	var afterStart = _getTextNodeContent(startElt).substring(startOffset) ;
	var beforeEnd = _getTextNodeContent(endElt).substring(0, endOffset) ;
	var afterEnd = _getTextNodeContent(endElt).substring(endOffset) ;

    var sameNode = (startElt === endElt) ;
    
//    log('beforeStart : ' + beforeStart + ' , afterStart : ' + afterStart + ' , beforeEnd : ' + beforeEnd + ' , afterEnd : ' + afterEnd + ' , sameNode : ' + sameNode) ;
 
    // taking care of start node : (and 'sameNode' case when start and end lie
	// on same node)
    if (afterStart != "") { // otherwise nothing to do on the start node
    	if (CY.DOM.hasClass(startElt, 'c-c')) {
    		var lastElt = null, afterStartElt = null, afterEndElt = null, beforeStartElt = null ;
    		
        	var btw = (sameNode) ? _getTextNodeContent(startElt).substring(startOffset, endOffset) : afterStart ;
        	        	

        	if (sameNode && (afterEnd != "")) {
				afterEndElt = startElt ;
				lastElt = afterEndElt ;
			}
	    	if (btw != "") {
	    		if (lastElt == null) {
	    			afterStartElt = startElt ;
	    		}
	    		else {
	    			afterStartElt = _yuiCloneNode(startElt) ;
	    			lastElt.parentNode.insertBefore(afterStartElt, lastElt) ;
	    		}
				lastElt = afterStartElt ;
	    	}
	    	if (beforeStart != "") {
	    		if (lastElt == null) {
	    			beforeStartElt = startElt ;
	    		}
	    		else {
	    			beforeStartElt = _yuiCloneNode(startElt) ;
	    			lastElt.parentNode.insertBefore(beforeStartElt, lastElt) ;
	    		}
				lastElt = beforeStartElt ;
	    	}
	    	
			if (afterEndElt != null) {
				_setTextNodeContent(afterEndElt, afterEnd) ;
			}
			
	    	if (afterStartElt != null) {
				_setTextNodeContent(afterStartElt, btw) ;
	    		_addIdClass(afterStartElt, commentId) ;
	    	}

//	    	alert('beforeStartElt.firstChild.data.length: ' + beforeStartElt.firstChild.data.length);
//	    	alert('beforeStartElt.childNodes.length: ' + beforeStartElt.childNodes.length);
	    	if (beforeStartElt != null) {
				_setTextNodeContent(beforeStartElt, beforeStart) ; 
	    	}
//	    	alert('beforeStartElt.childNodes.length: ' + beforeStartElt.childNodes.length);
	    	//alert('typeof beforeStartElt: ' + typeof beforeStartElt);
//	    	alert('beforeStartElt.lastChild ==  beforeStartElt.firstChild : ' + (beforeStartElt.lastChild == beforeStartElt.firstChild));
	    	
//	    	alert('beforeStartElt.firstChild.id : ' + beforeStartElt.firstChild.id);
//	    	alert('beforeStartElt.lastChild.data : ' + beforeStartElt.lastChild.data);
//	    	alert('beforeStartElt.firstChild.data : ' + beforeStartElt.firstChild.data);
//	    	alert('afterStartElt.firstChild.data : ' + afterStartElt.firstChild.data);
//	    	alert('afterEndElt.firstChild.data : ' + afterEndElt.firstChild.data);
	    	
       	}
    }
    if ( ( !sameNode ) && ( beforeEnd != "" ) ) { // otherwise nothing to do
													// on the end node
    	if (CY.DOM.hasClass(endElt, 'c-c')) {
    		var lastElt = null, beforeEndElt = null, afterEndElt = null ;
    		
	    	if (afterEnd != "") {
	    		afterEndElt = endElt ;
				lastElt = endElt ;
			}
			
	    	if (beforeEnd != "") {
	    		if (lastElt == null)
	    			beforeEndElt = endElt ;
	    		else {
	    			beforeEndElt = _yuiCloneNode(endElt) ;
	    			lastElt.parentNode.insertBefore(beforeEndElt, lastElt) ;
	    		}
				lastElt = beforeEndElt ;
	    	}
	    	if (afterEndElt != null) {
	    		_setTextNodeContent(afterEndElt, afterEnd) ;
			}
			
	    	if (beforeEndElt != null) {
	    		_addIdClass(beforeEndElt, commentId) ;
	    		_setTextNodeContent(beforeEndElt, beforeEnd) ;
	    	}
    	}
    }
} ;

// WARNING (200891108): had to use YUI cloneNode instead of the native cloneNode
// (because of the _yuid that is cloned under IE, cf tests made in textYUIcloneNode.html)
// so code like :
// afterStartElt = startElt.cloneNode(true) ;
// afterStartElt.id = CY.guid() ;
// was replaced with :
// afterStartElt = _yuiCloneNode(startElt) ;
_yuiCloneNode = function (srcElt) {
	var ret = CY.Node.getDOMNode(CY.get('#'+srcElt.id).cloneNode(true)) ;
	ret.id = CY.guid();
	return ret ;
} ;

// will wrap textNodes into c-c spans going up the DOM tree from elt to ancestor
// textNodes impacted here will be those that are :
// the same generation or older than elt (but elt is excluded)
// AND not older than grand children of to
// assumption :
// 1 ancestor is an ancestor of elt (we'll be going up the DOM tree)
// 2 elt is a textNode.
// argumentss :
// prev : will spannify previous siblings if true, next siblings otherwise
_dynSpanToAnc = function (elt, ancestor, commentId, prev) {
// log('in : _dynSpanToAnc, elt : ' + elt.id) ;
	var c = elt ;
    while ((c != null) && (c !== ancestor) && (c.parentNode !== ancestor)) {
		var c_sib = null ;
		if (prev) {
			c_sib = c.previousSibling ;
		}
		else {
			c_sib = c.nextSibling ;
		}
		
		if (c_sib == null) {
			c = c.parentNode ;
		}
		else {
			c = c_sib ;			
			_recAddComment(c, commentId) ;
		}
	} ;
} ;

// between elt1 and elt2 (which are excluded)
_dynSpanInBetween = function (anc, elt1, elt2, commentId) {
	var a = elt1 ;
	var elt1Anc = null ;
    while (a) {
        if (a.parentNode === anc) {
        	elt1Anc = a ;
        	break;
        }
        a = a.parentNode;
    }
	if (elt1Anc != null) {
		a = elt2 ;
		var elt2Anc = null ;
	    while (a) {
	        if (a.parentNode === anc) {
	        	elt2Anc = a ;
	        	break;
	        }
	        a = a.parentNode;
	    }
		if (elt2Anc != null) { // found both ancestor, now doing the work
			a = elt1Anc.nextSibling ;
			while ((a != null) && (a !== elt2Anc)) {
				_recAddComment(a, commentId) ;
				a = a.nextSibling ;
			}
		}
	}
} ;

// (copied from YUI dom-base)
_bruteContains = function(element, needle) {
    while (needle) {
        if (element === needle) {
            return true;
        }
        needle = needle.parentNode;
    }
    return false;
},

//elt is supposed to be c-c classed
_addIdClass = function (elt, commentId) {
	CY.DOM.addClass(elt, 'c-id-' + commentId) ;
	_updateCommentCounter(elt) ;
} ;

//elt is supposed to be c-c classed
_removeIdClass = function (elt, commentId) {
	CY.DOM.removeClass(elt, 'c-id-' + commentId) ;
	_updateCommentCounter(elt) ;
} ;

//elt is supposed to be c-c classed
_removeIdClasses = function (elt) {
	var re = _cgetRegExp('(?:^|\\s+)c-id-(?:\\d+)', 'g');
	elt['className'] = elt['className'].replace(re, " ") ;
	_updateCommentCounter(elt) ;
} ;

_recAddComment = function (elt, commentId) {
	if (CY.DOM.hasClass(elt, 'c-c')) {
		_addIdClass(elt, commentId) ;
	}
	else {
		var c = elt.firstChild ;
        while (c != null) {
        	_recAddComment(c, commentId) ;
			c = c.nextSibling ;
        }
    }
} ;

// might be expensive ... (? maybe should use contains when available, instead
// of custom _bruteContains)
_findCommonAncestor = function (elt1, elt2) {
	if (_bruteContains(elt1, elt2))
		return elt1 ;
	else {
		var e = elt2 ;
		while ((e != null) && !_bruteContains(e, elt1)) {
			e = e.parentNode ; 
		}
		return e ;
	}
} ;

_cregexCache = {} ;
// inspired (copied) from dom-base-debug in yui
_cgetRegExp = function(str, flags) {
    flags = flags || '';
    if (!_cregexCache[str + flags]) {
        _cregexCache[str + flags] = new RegExp(str, flags);
    }
    return _cregexCache[str + flags];
} ;

//c-c should be classed with a c-count-x where x is a number for color graduation
//c-c should be classed with many c-id-xid where xid is the comment db id of comment that apply to it
_updateCommentCounter = function (elt) {
	var re = _cgetRegExp('(?:^|\\s+)c-id-(?:\\d+)', 'g');
	var matches = elt['className'].match(re);
	var countIds = (matches == null) ? 0 : matches.length ;
	
	re = _cgetRegExp('(?:^|\\s+)c-count-(?:\\d+)', 'g');
	elt['className'] = elt['className'].replace(re, " ") ;
	CY.DOM.addClass(elt, 'c-count-'+countIds+' ') ;
} ;

_convertSelectionFromCCToCS = function (sel) {
	var offset = sel['offset'] ;
	var elt = sel['elt'].parentNode ;
	
	var e = sel['elt'].previousSibling ;
	while (e != null) {
		offset += _getTextNodeContent(e).length ;
		e = e.previousSibling ; // will be a c-c !!
	}
	
	return  {'elt':elt, 'offset':offset} ;
} ;

_convertSelectionFromCSToCC = function (sel) {
	var ret = {'elt':null, 'offset':-1} ;
	
	var cc = null ;
	var ccElt = sel['elt'].firstChild ;
	var length = 0 ;
	while (ccElt != null) {
		var prevLength = length ;
		length += _getTextNodeContent(ccElt).length ;
		if (length >= sel['offset']) {
			ret['elt'] = ccElt ;
			ret['offset'] = sel['offset'] - prevLength ;
			break ;
		}
		ccElt = ccElt.nextSibling ; // will be a c-c !!
	}
	return ret ;
} ;


/*******************************************************************************/
/* SCOPE REMOVAL */
/*******************************************************************************/

unpaintCommentScope = function(comment) {
    var dbId = comment.id;

	var classeId = 'c-id-' + dbId ;
	var toBeRemovedElts = [] ;

	var cNodeList = CY.all("."+classeId) ;
	if (cNodeList != null) { // null in case of a reply ...
		for (var i = 0, ilen = cNodeList.size() ; i < ilen ; i++)  {
			var c = cNodeList.item(i) ;
			if (c.hasClass('c-c')) { // always will !!
				var cElt = CY.Node.getDOMNode(c) ;
				_removeIdClass(cElt, dbId) ;
				
				var cIds = getCommentIdsFromClasses(cElt) ;
				quicksort(cIds) ;
				
				var p = c.get('previousSibling') ;
				if (p != null) {
					var pElt = CY.Node.getDOMNode(p) ;
					var pIds = getCommentIdsFromClasses(pElt) ; 
					quicksort(pIds) ;
					if (areSortedArraysEqual(cIds, pIds)) {
						_setTextNodeContent(cElt, _getTextNodeContent(pElt) + _getTextNodeContent(cElt)) ;						
						toBeRemovedElts.push(pElt) ;
					}
				}
				
				var n = c.get('nextSibling') ;
				if (n != null) {
					var nElt = CY.Node.getDOMNode(n) ;
					var nIds = getCommentIdsFromClasses(nElt) ; 
					quicksort(nIds) ;
					if (areSortedArraysEqual(cIds, nIds)) {
						cElt.firstChild.data = cElt.firstChild.data + nElt.firstChild.data; 
						toBeRemovedElts.push(nElt) ;
					}
				}
			}
			else {
				alert('HAS NO c-c ? : ' + commentNode.get('id') + " , innerHTML :" + commentNode.get('innerHTML')) ;
				return ;
			}
		}
	}
	for (var i = 0, ilen = toBeRemovedElts.length ; i < ilen ; i++)  {
		toBeRemovedElts[i].parentNode.removeChild(toBeRemovedElts[i]) ;
	}
} ;

// not related to the unpaintCommentScope function (faster)
unpaintAllComments = function() {
	var cNodeList= CY.all(".c-s") ;
	var toBeRemovedElts = [] ;
	for (var i = 0, ilen = cNodeList.size() ; i < ilen ; i++)  {
		var c = cNodeList.item(i) ;
		
		// remove Classes
		var fc = c.get('firstChild') ;
		var fcElt = CY.Node.getDOMNode(c.get('firstChild')) ;
		_removeIdClasses(fcElt) ;
		
		// merge nodes
		var n = fc.get('nextSibling') ;
		while (n != null)  {
			var nElt = CY.Node.getDOMNode(n) ;
			fcElt.firstChild.data = fcElt.firstChild.data + nElt.firstChild.data; 
			toBeRemovedElts.push(nElt) ;
			n = n.get('nextSibling') ;
		}
	}
	for (var i = 0, ilen = toBeRemovedElts.length ; i < ilen ; i++)  {
		toBeRemovedElts[i].parentNode.removeChild(toBeRemovedElts[i]) ;
	}

} ;

showScope = function(commentDbId) {
	var s = CY.all('.c-id-' + commentDbId); 
	if (s != null)
		s.addClass('c-scope') ;
} ;

hideScopeAnyway = function() {
	var s = CY.all('.c-scope'); 
	if (s != null)
		s.removeClass('c-scope') ;
}

