// gConf
IComments = function() {
  // this class manages Comments interface (fetched comments <--> IComment.commentId != null)

  this._c = [] ; // IComments instances   // commentId == null means is connected to no comment anymore

  this._a = [] ; // IComments animations to run

  this._nbEndedAnim = 0 ;

  this._topActiveCommentDbId = null ; // active 
}

IComments.prototype = {
    init : function (container) {
      for (var i = 0 ; i < gConf['iCommentsInitAlloc']; i++) { 
        this._c.push(new IComment()) ;
      }
    },

    getIComment : function (commentId) {
      return CY.Array.find(this._c, function(iComment) { return (iComment.isfetched() && iComment.commentId == commentId) ;}) ;
    },
    
    insertAfter : function (previousComment, comment) {
      var _cids = CY.Array.map(this._c, function(iComment) { return iComment.commentId ; }) ;
      var index = CY.Array.indexOf(_cids, previousComment.id) ;
      if (index != -1) {
        this._c.splice(index + 1, 0, new IComment()) ; // will append when index + 1 == array length
        this._c[index + 1].fetch(comment) ;
        return this._c[index + 1] ;
      }
      return null ;
    },
    
    _remove : function (iComments) {
      var toRemoveIds = CY.Array.map(iComments, function(comment) { return comment.commentId ; }) ;
      
      for (var i = 0 ; i < this._c.length ; i++) { // starting at the bottom to be sure that last remove will be iComment  
        var iComment2 = this._c[i] ;
        if (iComment2.isfetched() && CY.Array.indexOf(toRemoveIds, iComment2.commentId) != -1) {
          
          iComment2.unfetch() ;

          this._c.push(this._c.splice(i, 1)[0]) ;
          
          i-- ;
        }
      }
    },
    
    // all children, comment's IComment included !
    // model based (cf. gDb)
    _getChildren : function (commentId) {
      return CY.Array.filter(this._c, function(iComment) { return (iComment.isfetched() && gDb.isChild(iComment.commentId,commentId)) ; }) ;
    },

    _getInvisibleChildren : function (commentId) {
      return CY.Array.filter(this._getChildren(commentId), function(iComment) { return (!iComment.isVisible()) ; }) ;
    },

    // REFRESH (readreplies link etc ?..)
    refresh : function (commentId) {
      
      var iComment = this.getIComment(commentId) ;

      var invisibleChildrenIComments = this._getInvisibleChildren(commentId) ;
      if (invisibleChildrenIComments.length > 0) //parentIComment is supposed to be visible
        iComment.showReadRepliesLnk() ;
      else
        iComment.hideReadRepliesLnk() ;
    },

    remove : function (commentId) {
      this._remove(this._getChildren(commentId)) ;
    },

    close : function (commentId) {
      CY.Array.each(this._getChildren(commentId), function (iComment) { iComment.hide() ; }) ;
    },

    open : function (commentId) {
      CY.Array.each(this._getChildren(commentId), function (iComment) { iComment.show() ; }) ;
    },

    fetch : function (comments) {
      // fill
      for (var i = 0 ; i < comments.length; i++) {
        if (i == this._c.length)
          this._c.push(new IComment()) ;
        
        this._c[i].fetch(comments[i]) ;
      }
      
      // nullify others
      for (var i = comments.length ; i < this._c.length ; i++) {
        this._c[i].unfetch() ;
      }
    },
    
    setPosition : function (xy) {
      CY.each(this._c, function (iComment) { iComment.setPosition(xy) ; }) ;
    },

    show : function () {
      CY.each(this._c, function (iComment) { 
        if (iComment.isfetched()) {
          iComment.show();
        }}) ;
    },
    
    hide : function () {
      this.deactivate(); // to prevent a chain of activate / deactivate while hiding IComments one by one
      CY.each(this._c, function (iComment) { if (iComment.commentId != null) iComment.hide(); }) ;
    },
    
    setWidth : function (colWidth) {
      var nextY = null ;
      for (var i = 0 ; i < this._c.length; i++) {
        var iComment = this._c[i] ;
        iComment.setWidth(colWidth) ;
        
        if (iComment.commentId != null && iComment.isVisible()) {
          var xy = iComment.getPosition() ;
          if (nextY == null) 
            nextY = xy[1] ;
          xy[1] = nextY ;
          iComment.setPosition(xy) ;
          nextY += iComment.getHeight() ;
        }
      }
    },

    getTopPosition:function() {
      for (var i = 0 ; i < this._c.length; i++) {
        var iComment = this._c[i] ;
        if (iComment.commentId != null && iComment.isVisible())
          return iComment.getPosition() ;
      }
      return null
    },

    getPosition:function(id) {
      for (var i = 0 ; i < this._c.length; i++) {
        var iComment = this._c[i] ;
        if (iComment.commentId == id && iComment.isVisible())
          return iComment.getPosition() ;
      }
      return null ;
    },

    setAnimationToPositions : function (y) {
      this._initAnimations();
      //CY.log(gPrefs.get('comments','threadpad')) ;
      var lpad = (gPrefs.get('comments','threadpad') == '1') ? gConf['iCommentThreadPadding'] : 0 ; // gIThreadPad ... TODO 'configurize'

      var nextY = y ;
      for (var i = 0 ; i < this._c.length;i++) {
        var iComment = this._c[i] ;
        if (iComment.isfetched && iComment.isVisible()) {
          var comment_path = gDb.getPath(gDb.getComment(iComment.commentId)) ;
          var iCommentX = ((comment_path.length - 1) * lpad) + gConf['iCommentLeftPadding'] ;

          if (nextY == null) {
            var xy = iComment.getPosition() ;
            nextY = xy[1] ;
          }
          
          this._a.push(iComment.setAnimationToPosition([iCommentX, nextY])) ;
          nextY += iComment.getHeight() ;
        }
      }
    },
    
    setAnimationToPositionsAndFocus : function (y, focusCommentId, reply) {
      this._initAnimations();
      var lpad = (gPrefs.get('comments','threadpad') == '1') ? gConf['iCommentThreadPadding'] : 0 ;

      var nextY = y ;
      for (var i = 0 ; i < this._c.length;i++) {
        var iComment = this._c[i] ;
        if (iComment.isfetched && iComment.isVisible()) {
          var comment_path = gDb.getPath(gDb.getComment(iComment.commentId)) ;
          var iCommentX = ((comment_path.length - 1) * lpad) + gConf['iCommentLeftPadding'] ;

          if (nextY == null) {
            var xy = iComment.getPosition() ;
            nextY = xy[1] ;
          }
          
          if (iComment.commentId >= focusCommentId)
            this._a.push(iComment.setAnimationToPosition([iCommentX, nextY], focusCommentId, reply)) ;
          else
            this._a.push(iComment.setAnimationToPosition([iCommentX, nextY])) ;
          nextY += iComment.getHeight() ;
        }
      }
    },
    
// ANIMATION FUNCTIONS    
    _initAnimations : function () {
      this._a = [] ;
      this._nbEndedAnim = 0 ;     
    },
    
    runAnimations : function () {
      if (this._a.length == 0) // will occur when closing last displayed comment
        gSync.resetAutoContinue("animationRun") ;
      else 
        CY.each(this._a, function (animation) { animation.run() ; }) ;
    },
    
    whenAnimationsEnd : function () {
      gSync.resume() ;    
    },
    
    whenAnimationsEndFocus : function () {
      gGETValues = CY.JSON.parse(sv_get_params);
      if ("comment_id_key" in gGETValues) {
        var id_key = gGETValues["comment_id_key"];
        var focusComment = gDb.getCommentByIdKey(id_key);
        if (focusComment != null)
          gIComments.getIComment(focusComment.id).overlay.focus();
      }
      gSync.resume();
    },
    
    whenAnimationsEndReply : function () {
      gGETValues = CY.JSON.parse(sv_get_params);
      if ("comment_id_key" in gGETValues) {
        var id_key = gGETValues["comment_id_key"];
        var focusComment = gDb.getCommentByIdKey(id_key);
        if (focusComment != null) {
          gSync.showReplyForm(gIComments.getIComment(focusComment.id));
        }
      }
      gSync.resume();
    },
    
    animationsEnded : function () {
      return ((this._a.length == 0) || (this._a.length == this._nbEndedAnim)) ;     
    },
    
    signalAnimationEnd : function () {
      this._nbEndedAnim++ ;         
    },
    
// ACTIVE RELATED FUNCTIONS   
    // returns true only for the top iComment
    isTopActive : function(commentDbId) {
      return ((commentDbId != null) && (this._topActiveCommentDbId == commentDbId)) ;
    },
    
    isAnyActive : function() {
      return (this._topActiveCommentDbId != null) ;
    },
    
    //warning : calling this function "focus" would make IE get mad
    activate : function(commentDbId) {
      
      if (this._topActiveCommentDbId != null) {// then deactivate current 
        this.deactivate() ;
      }

      // activate whole top parent thread
      var comment = gDb.getComment(commentDbId) ;
      var comment_path = gDb.getPath(comment) ;
      var topParent = comment_path[comment_path.length - 1] ;
      
      var iComments = this._getChildren(topParent.id) ;
      CY.Array.each(iComments, function(iComment){iComment.activate();}) ;

      this._topActiveCommentDbId = topParent.id ;

      // update browser index
      if (gLayout.isInFrame()) {
        var indxDict = gDb.browsingIndex(this._topActiveCommentDbId) ;
        parent.$("#browse_by option").each(function() {
          var rank = 1 + indxDict[this.value] ;
          parent.$("#c_browse_indx_"+this.value).html(''+ rank) ;
        }) ;
      }
      
      showScope(topParent.id) ;
    },
    
    deactivate : function() {
      if (this._topActiveCommentDbId != null) {
        parent.$("#browse_by option").each(function() {
          parent.$("#c_browse_indx_"+this.value).html('-') ;
        }) ;

        // scopes
        hideScopeAnyway() ;
        
        var iComments = this._getChildren(this._topActiveCommentDbId) ;
        CY.Array.each(iComments, function(iComment){iComment.deactivate();}) ;

        this._topActiveCommentDbId = null ;
      }
    },

    // active next IComment among the displayed ones (try below and if couldn't try above)
    // model based
    activateVisibleNext : function() {
      
      if (this._topActiveCommentDbId != null) {

        for (var j = 0 ; j < 2 ; j++) {
          
          var start = (j==0) ? 0 : this._c.length - 1 ; 
          
          var b = false ;
          
          for (var i = start ; (i >= 0) && i <= (this._c.length - 1) ;) {
            var iComment = this._c[i] ;
            
            if (iComment.commentId != null && iComment.isVisible()) {
              b = b || (gDb.isChild(iComment.commentId,this._topActiveCommentDbId)) ; 
              if (b && (!gDb.isChild(iComment.commentId,this._topActiveCommentDbId))) { // found the one below that doesn't have topActive as parent
                this.activate(iComment.commentId) ;
                return true ;
              }
            }
            i = (j == 0) ? i + 1 : i - 1 ;
          }
        }
      }
      return false ;
    },
    
    browse : function(order, whereto) {
      var wt = whereto ;
      if ((whereto == "prev") && !this.isAnyActive()) {
        wt = "last" ;
      }
      if ((whereto == "next") && !this.isAnyActive()) {
        wt = "first" ;
      }
      return gDb.browse(order, wt, this._topActiveCommentDbId) ;
    }
    
}