// 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 && comment['start_wrapper'] != -1) {

    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+' ') ;

  if (countIds > 0) {

    elt.setAttribute ('title', countIds + ngettext(' comment', ' comments', countIds));

    if (countIds > 25) {

      // ensure that we have the last color even if there are too many comments on the same place

      CY.DOM.addClass(elt, 'c-count-25') ;

    }

  }

} ;