/*
 * library for ajaxcourse formats, the classes and related functions for sections and resources
 * this library requires a 'main' object created in calling document 
 */
 
 
function section_class(id,group,config,isDraggable){
    this.init_section(id,group,config,isDraggable);
}
YAHOO.extend(section_class, YAHOO.util.DDProxy);

section_class.prototype.debug = false;

section_class.prototype.init_section = function(id, group,config,isDraggable){
        if (!id) { return; }
        
        this.is = 'section'; 
        this.sectionId = null;
        
                   
        if(!isDraggable){            
            this.initTarget(id,group,config);
            this.removeFromGroup('sections');
        }else{                 
            this.init(id,group,config);         
            this.handle = null;           
        }
                           
        this.createFrame();     
        this.isTarget = true;

        this.resources = [];
        this.numberDisplay = null;
        this.summary = null;
        this.content_td = null;
        this.hidden = false;
        this.highlighted = false;
        this.showOnly = false;
        this.resources_ul = null;        
        this.process_section();
        
        this.viewButton = null;
        this.highlightButton = null;
        this.showOnlyButton = null;
        this.init_buttons();
       
        if(isDraggable)this.add_handle();                       
           
        if(this.debug)YAHOO.log("init_section "+id+" draggable="+isDraggable);

        
        if(YAHOO.util.Dom.hasClass(this.getEl(),'hidden'))
           this.toggle_hide(null,null,true);
                
    }
    
section_class.prototype.init_buttons = function(){      
       var commandContainer = this.getEl().childNodes[2];
        
       //clear all but show only button 
       var commandContainerCount = commandContainer.childNodes.length;
       for(var i=(commandContainerCount-1);i>0;i--)
         commandContainer.removeChild(commandContainer.childNodes[i])
      
       
       if(!this.isWeekFormat){        
           var highlightbutton = main.mk_button('div','/pix/i/marker.gif');
           YAHOO.util.Event.addListener(highlightbutton,'click',this.mk_marker,this,true);
           commandContainer.appendChild(highlightbutton); 
           this.highlightButton = highlightbutton;            
       }
       var viewbutton = main.mk_button('div','/pix/i/hide.gif');
       YAHOO.util.Event.addListener(viewbutton,'click',this.toggle_hide,this,true);
       commandContainer.appendChild(viewbutton);
       this.viewButton = viewbutton;
           
    }


section_class.prototype.add_handle = function(){
        var handleRef = main.mk_button('div','/pix/i/move_2d.gif',[['style','cursor:move']]);
        YAHOO.util.Dom.generateId(handleRef,'sectionHandle');

        this.handle = handleRef;
        
        this.getEl().childNodes[0].appendChild(handleRef);
        this.setHandleElId(this.handle.id);
    }
       
    
section_class.prototype.process_section = function(){
       this.content_td = this.getEl().childNodes[1];
              
            
       if(YAHOO.util.Dom.hasClass(this.getEl(),'current')){
           this.highlighted = true;
           main.marker = this;
       }
           
       
       //create holder for display number for access later
       
       this.numberDisplay = document.createElement('div');
       this.numberDisplay.innerHTML = this.getEl().childNodes[0].innerHTML;
       this.getEl().childNodes[0].innerHTML = '';
       this.getEl().childNodes[0].appendChild(this.numberDisplay);  
       
       this.sectionId = this.numberDisplay.innerHTML;

       if(this.debug)YAHOO.log("Creating section "+this.getEl().id+" in position "+this.sectionId);
       //find/edit resources

        this.resources_ul = this.content_td.getElementsByTagName('ul')[0];
        if(this.resources_ul == null){
            this.resources_ul = document.createElement('ul');
            this.resources_ul.className='section';
            this.content_td.insertBefore(this.resources_ul,this.content_td.childNodes[1]);
        }
        
        var resource_count = this.resources_ul.getElementsByTagName('li').length;
        
        
        for(var i=0;i<resource_count;i++){
            var resource = this.resources_ul.getElementsByTagName('li')[i];
            if(YAHOO.util.Dom.hasClass(resource,'resource')){
                this.resources[this.resources.length] = new resource_class(resource.id,'resources',null,this);
                if(this.debug)YAHOO.log("Found resource");
            }else{
                this.resources[this.resources.length] = new activity_class(resource.id,'resources',null,this);                
            }
        }                

        this.summary = YAHOO.util.Dom.getElementsByClassName('summary',null,this.getEl())[0].firstChild.data || '';

       
    }
    
section_class.prototype.startDrag = function(x, y) {   
    //operates in point mode
    YAHOO.util.DDM.mode = YAHOO.util.DDM.POINT;
    
    //remove from resources group temporarily
    this.removeFromGroup('resources');
    
    //reinitialize dd element
    this.getDragEl().innerHTML = '';
    
    var targets = YAHOO.util.DDM.getRelated(this, true);
    if(this.debug)YAHOO.log(this.sectionId + " startDrag "+targets.length + " targets");

    }

section_class.prototype.onDragDrop = function(e, id) {
    // get the drag and drop object that was targeted
    var target = YAHOO.util.DDM.getDDById(id);

    if(this.debug)YAHOO.log("Section dropped on id="+id+" el = "+this.getEl().id+" x="+YAHOO.util.Dom.getXY(this.getDragEl()));
    
    this.move_to_section(target);
    
     //add back to resources group
    this.addToGroup('resources');    
    }  
section_class.prototype.endDrag = function(){
     //nessicary to defeat default action
     
     //add back to resources group
    this.addToGroup('resources');
    }    
    
section_class.prototype.move_to_section = function(target){
       var tempTd = document.createElement('td');
       var tempStore = null;
       var sectionCount = main.sections.length;
       var found = null;
       
       //determine if original is above or below target and adjust loop
       var oIndex=main.get_section_index(this);
       var tIndex=main.get_section_index(target);
       
       if(this.debug)YAHOO.log("original is at: "+oIndex+" target is at:"+tIndex+" of "+(sectionCount-1));
       
       if(oIndex < tIndex){
          var loopCondition = 'i<sectionCount';
          var loopStart = 1;
          var loopInc = 'i++';
          var loopmodifier = 'i-1'; 
       }else{
          var loopCondition = 'i>0';
          var loopStart = sectionCount-1;  
          var loopInc = 'i--'; 
          var loopmodifier = 'i+1';       
       }
       
       //move on backend
       main.connect('post','class=section&field=move',null,'id='+this.sectionId+'&value='+(target.sectionId-this.sectionId));
           
       
       //move on front end
       for(var i=loopStart;eval(loopCondition);eval(loopInc)){
          
           if((main.sections[i] == this)&& !found){
               //enounter with original node
                if(this.debug)YAHOO.log("Found Original "+main.sections[i].getEl().id);
               if(main.sections[i] == this){
                   found = true;               
               }
             
           }else if(main.sections[i] == target){
               //encounter with target node
               if(this.debug)YAHOO.log("Found target "+main.sections[i].getEl().id);
                main.sections[i].swap_with_section(main.sections[eval(loopmodifier)]);
                found = false;
                break;
                                     
           }else if(found){
              //encounter with nodes inbetween 
                 main.sections[i].swap_with_section(main.sections[eval(loopmodifier)]);
           }            
       }  
              
    }
    
    
section_class.prototype.swap_with_section = function(sectionIn){    
       var tmpStore = null;
              
       thisIndex = main.get_section_index(this);
       targetIndex = main.get_section_index(sectionIn);
       main.sections[targetIndex] = this;
       main.sections[thisIndex] = sectionIn;
       
       this.changeId(targetIndex);
       sectionIn.changeId(thisIndex);
       
       if(this.debug)YAHOO.log("Swapping "+this.getEl().id+" with "+sectionIn.getEl().id);
              
       YAHOO.util.DDM.swapNode(this.getEl(),sectionIn.getEl());        
                
       
    }

section_class.prototype.toggle_hide = function(e,target,superficial){
       if(this.hidden){  
          YAHOO.util.Dom.removeClass(this.getEl(),'hidden');
          this.viewButton.childNodes[0].src = this.viewButton.childNodes[0].src.replace(/show.gif/i,'hide.gif');          
          this.hidden = false;
          
          if(!superficial){
              main.connect('post','class=section&field=visible',null,'value=1&id='+this.sectionId);
              for(var x=0;x<this.resources.length;x++){                                
                  this.resources[x].toggle_hide(null,null,true,this.resources[x].hiddenStored);
                  this.resources[x].hiddenStored = null;
              }
          }
          
       }else{
          YAHOO.util.Dom.addClass(this.getEl(),'hidden');
          this.viewButton.childNodes[0].src = this.viewButton.childNodes[0].src.replace(/hide.gif/i,'show.gif');           
          this.hidden = true;
          
          if(!superficial){
              main.connect('post','class=section&field=visible',null,'value=0&id='+this.sectionId);
              for(var x=0;x<this.resources.length;x++){
                  this.resources[x].hiddenStored = this.resources[x].hidden;                                
                  this.resources[x].toggle_hide(null,null,true,true);
              }             
          }
       }
    }

section_class.prototype.toggle_highlight = function(){
       if(this.highlighted){  
          YAHOO.util.Dom.removeClass(this.getEl(),'current');
          this.highlighted = false;
       }else{
           YAHOO.util.Dom.addClass(this.getEl(),'current');
           this.highlighted = true;
       }
    } 
    
section_class.prototype.mk_marker = function(){
      if(main.marker != this){
         main.update_marker(this);
      
      }else{//if currently the marker
         main.marker = null;
         
         main.connect('post','class=course&field=marker',null,'value=0');
         this.toggle_highlight();
          
      }
    
    }    
    
section_class.prototype.changeId = function(newId){                       
        this.sectionId = newId;       
        this.numberDisplay.firstChild.data = newId;                      
                      
        //main.connectQueue_add('post','class=section&field=all',null,'id='+newId+"&summary="+main.mk_safe_for_transport(this.summary)+"&sequence="+this.write_sequence_list(true)+'&visible='+(this.hidden?0:1))           
        
        if(main.marker == this)
              main.update_marker(this);                   
    }     

section_class.prototype.get_resource_index = function(el){
       for(var x=0;x<this.resources.length;x++)
           if(this.resources[x]==el)
                return x;
       YAHOO.log("Could not find resource to remove "+el.getEl().id,"error");
       return -1;
    }
    
section_class.prototype.remove_resource = function(el){
        var resourceCount = this.resources.length;
        if(resourceCount == 1){
            if(this.resources[0] == el)
                 this.resources = new Array();    
        }else{
            var found = false;
            for(var i=0;i<resourceCount;i++){
                if(found){
                    this.resources[i-1] = this.resources[i];         
                    if(i==resourceCount-1){
                        this.resources = this.resources.slice(0,-1);
                        resourceCount--;
                    }
                    this.resources[i-1].update_index(i-1);
                }else if(this.resources[i]==el){
                   found = true;
                }
            }
        }
                   
             
        //remove "text" nodes to keep DOM clean
        var childIndex = null;
        var childrenCount = this.resources_ul.childNodes.length; 
        for(var i=0;i<childrenCount;i++)
            if(this.resources_ul.childNodes[i] == el.getEl())
                childIndex = i;
        if(childIndex > 0 && childIndex < this.resources_ul.childNodes.length)
            this.resources_ul.removeChild(this.resources_ul.childNodes[childIndex-1]);
       YAHOO.log("removing "+el.getEl().id);
       if(el.getEl().parentNode != null)
          el.getEl().parentNode.removeChild(el.getEl()); 
          
       this.write_sequence_list();          
       
    }   
    
section_class.prototype.insert_resource = function(el,targetel){
        var resourcecount = this.resources.length;
        var found = false;
        var tempStore = nextStore = null;
        
        //update in backend
        targetId='';
        if(targetel !=null){
            targetId=targetel.id;
        }
        
        main.connect('post','class=resource&field=move',null,'id='+el.id+'&beforeId='+targetId+'&sectionId='+this.sectionId);
        
        
        
        //if inserting into a hidden resource hide
        if(this.hidden){
            el.hiddenStored = el.hidden; 
            el.toggle_hide(null,null,true,true);           
        }else{
            if(el.hiddenStored != null){
                el.toggle_hide(null,null,true,el.hiddenStored);
                el.hiddenStored = null;                
            }
        }
        
        //update model
        if(targetel == null){
            this.resources[this.resources.length] = el;
        }else 
            for(var i=0;i<resourcecount;i++){
                if(found){
                    tempStore = this.resources[i];
                    this.resources[i] = nextStore;
                    nextStore = tempStore;           
                    
                    if(nextStore != null)     
                       nextStore.update_index(i+1); 
                    
                }else if(this.resources[i] == targetel){
                    found = true;
                    nextStore = this.resources[i];
                    this.resources[i] = el;               
                    resourcecount++;
                    
                    this.resources[i].update_index(i,this.ident);
                    nextStore.update_index(i+1); 
                }                              
            }

       //update on frontend 
       if(targetel != null){ 
           this.resources_ul.insertBefore(el.getEl(),targetel.getEl());
           this.resources_ul.insertBefore(document.createTextNode(''),targetel.getEl());        
       
       }else{
           this.resources_ul.appendChild(el.getEl());
           this.resources_ul.appendChild(document.createTextNode(" "));
       }    
       el.parentObj = this;       
    }    
   
section_class.prototype.write_sequence_list = function(toReturn){
       var listOutput = '';
       for(var i=0;i<this.resources.length;i++){
           listOutput += this.resources[i].id;
           if(i != (this.resources.length-1))
                listOutput += ',';
       }
       
       if(toReturn)
            return listOutput;
       
    }   
   
   
   
/*
 * Resource Class extends util.DDProxy
 */   
   

function resource_class(id,group,config,parentObj){

    this.init_resource(id,group,config,parentObj);
}
YAHOO.extend(resource_class, YAHOO.util.DDProxy);

resource_class.prototype.debug = true;

resource_class.prototype.init_resource = function(id,group,config,parentObj){
        if (!id) { 
               YAHOO.log("Init resource, NO ID FOUND!",'error');
               return; 
            }
        
        this.is = 'resource';  
        this.init(id,group,config);  
        this.createFrame();     
        this.isTarget = true;
        
        this.id = this.getEl().id.replace(/module-/i,'');          
        
        this.hidden = false;
        if(YAHOO.util.Dom.hasClass(this.getEl().getElementsByTagName('a')[0],'dimmed'))
            this.hidden = true;
        this.hiddenStored = null;

        this.linkContainer = this.getEl().getElementsByTagName('a')[0];
        
        this.commandContainer = null;
        this.viewButton = null;
        this.handle = null;        
        this.init_buttons();
        
        this.parentObj = parentObj;        

        if(this.debug)YAHOO.log("init_resource "+id+" parent = "+parentObj.getEl().id);

    }
   
resource_class.prototype.init_buttons = function(){
       var  commandContainer = YAHOO.util.Dom.getElementsByClassName('commands','span',this.getEl())[0];
       if( commandContainer == null){
            YAHOO.log('Cannot find command container for '+this.getEl().id,'error');
            return;
       }

       this.commandContainer = commandContainer;
       
       //find edit button
       var updateButton = null;
       var buttons =  commandContainer.getElementsByTagName('a');
       for(var x=0;x<buttons.length;x++)
            if(buttons[x].title == 'Update')
                updateButton = buttons[x];
                     
       if(updateButton == null)
        YAHOO.log('Cannot find updateButton for '+this.getEl().id,'error');                     
        
       commandContainer.innerHTML = '';
                    
                    
       //add move-handle
       var handleRef = main.mk_button('a','/pix/i/move_2d.gif',[['style','cursor:move']],[['height','11'],['width','11'],['hspace','2'],['border','0']]);
       YAHOO.util.Dom.generateId(handleRef,'sectionHandle');
       this.handle = handleRef;
       
       commandContainer.appendChild(handleRef);
       this.setHandleElId(this.handle.id);
       
       
       
       //add edit button back in
       commandContainer.appendChild(updateButton);                  
       
       //add rest
       var button = main.mk_button('a','/pix/t/delete.gif');      
       YAHOO.util.Event.addListener(button,'click',this.delete_button,this,true);
       commandContainer.appendChild(button);       
       
       if(this.hidden)
           var button = main.mk_button('a','/pix/t/show.gif');      
       else
           var button = main.mk_button('a','/pix/t/hide.gif');                 
       YAHOO.util.Event.addListener(button,'click',this.toggle_hide,this,true);
       commandContainer.appendChild(button);   
       this.viewButton = button;
                                              
    }    
    
resource_class.prototype.toggle_hide = function(target,e,superficial,force){
       if(force != null){
           if(this.debug)YAHOO.log("Resource "+this.getEl().id+" forced to "+force);
           this.hidden = !force;           
       }
    
       if(this.hidden){
           YAHOO.util.Dom.removeClass(this.linkContainer,'dimmed');
           this.viewButton.childNodes[0].src = this.viewButton.childNodes[0].src.replace(/show.gif/i,'hide.gif');
           this.hidden = false;  
            
           if(!superficial){
               main.connect('post','class=resource&field=visible',null,'value=1&id='+this.id);
           }
       }else{
           YAHOO.util.Dom.addClass(this.linkContainer,'dimmed');
           this.viewButton.childNodes[0].src = this.viewButton.childNodes[0].src.replace(/hide.gif/i,'show.gif');
           this.hidden = true;
           
           if(!superficial){
              main.connect('post','class=resource&field=visible',null,'value=0&id='+this.id);           
           }
       }
    }

resource_class.prototype.delete_button = function(){
        if(this.debug)YAHOO.log("Deleteing "+this.getEl().id+"from parent "+this.parentObj.getEl().id);
        
        if(!confirm('Are you sure you wish to delete this '+this.is+"?")){
           return false;
        }
        
        this.getEl().parentNode.removeChild(this.getEl());
        this.parentObj.remove_resource(this);
        
        main.connect('delete','class=resource&id='+this.id);        
    }  
    
resource_class.prototype.update_index = function(index){
        if(this.debug)YAHOO.log("update Index for resource "+this.getEl().id+"to"+index);
   }   
    
    
resource_class.prototype.startDrag = function(x, y) {   
    //operates in intersect mode
    YAHOO.util.DDM.mode = YAHOO.util.DDM.INTERSECT;
    
    //reinitialize dd element
    this.getDragEl().innerHTML = '';
    
    var targets = YAHOO.util.DDM.getRelated(this, true);
    if(this.debug)YAHOO.log(this.id + " startDrag "+targets.length + " targets");
        
    }

resource_class.prototype.onDragDrop = function(e, ids) {
    // best fit Id
    var id=[];
    for(var i=0;i<ids.length;i++)
      if(ids[i].is == 'resource')
          id[id.length] = ids[i];

    if(id.length == 0)
       id = ids;
      
      
    // get the drag and drop object that was targeted
    var target = YAHOO.util.DDM.getBestMatch(id);

    if(this.debug)YAHOO.log("dropped on id="+target+" el = "+this.getEl().id+" x="+YAHOO.util.Dom.getXY(this.getDragEl()));
    
    this.parentObj.remove_resource(this);    

    if(target.is == 'resource'||target.is == 'activity'){             
        target.parentObj.insert_resource(this,target);
        
    }else if(target.is =='section'){
        target.insert_resource(this);
        
    }

    return;
    }    

resource_class.prototype.endDrag = function() {
     //eliminates default action
    }
    
/*
 * activity Class extends resource class
 */    
    
    
function activity_class(id,group,config,parentObj){
    this.init_activity(id,group,config,parentObj);
}
YAHOO.extend(activity_class, resource_class);

activity_class.prototype.init_activity = function(id,group,config,parentObj){
        if (!id) { 
              YAHOO.log("Init activity, NO ID FOUND!",'error');
              return; 
         }    
         
        this.is = 'activity'; 
        this.currentGroup = this.get_current_group(id);
        
        this.init_resource(id,group,config,parentObj);
             
        this.groupButton= null;
        this.init_activity_button();
                  
        if(this.debug)YAHOO.log("--init_activity "+id);         
        
    }
    
activity_class.prototype.groupImages = ['/pix/t/groupn.gif','/pix/t/groups.gif','/pix/t/groupv.gif'];    
    
activity_class.prototype.init_activity_button = function(){         
       var button = main.mk_button('a',this.groupImages[this.currentGroup]); 
       YAHOO.util.Event.addListener(button,'click',this.toggle_group,this,true);
       this.commandContainer.appendChild(button);   
       this.groupButton = button;        
    }    

activity_class.prototype.get_current_group = function(id){
       if(document.getElementById(id) == null){
          return;
       }
       
       var groupNodeArray = document.getElementById(id).getElementsByTagName('a');
       var groupNode = groupNodeArray[groupNodeArray.length-1];

       for(var x=0;x<this.groupImages.length;x++){
            if(main.portal.wwwroot+this.groupImages[x] == groupNode.getElementsByTagName('img')[0].src){
                return x;
            }
       }
       
       return 0;
    }
    
activity_class.prototype.toggle_group = function(){
        this.currentGroup++;
        if(this.currentGroup > 2)
          this.currentGroup = 0;
        
        this.groupButton.getElementsByTagName('img')[0].src = main.portal.wwwroot + this.groupImages[this.currentGroup];
        
        main.connect('post','class=resource&field=groupmode',null,'value='+this.currentGroup+'&id='+this.id);
    }