/* $Id: claroline.linker.js 12500 2010-07-14 13:08:29Z dimitrirambout $ */

/*
This code will work with html like this
<div id="lnk_panel">
 <div id="lnk_ajax_loading">load</div>
 <div id="lnk_selected_resources"></div>
 <h4 id="lnk_location"></h4>
 <div id="lnk_resources"></div>
 <div id="lnk_hidden_fields"></div>
</div>

*/


$(document).ready(function(){
    
    // hide elements that should not be shown directly
    
    // resources browser
    $("#lnk_browser").hide();
    // hide browser link
    $("#lnk_hide_browser").hide();
    // activity  
    $("#lnk_ajax_loading").hide();
    
    // load link list
    linkerFrontend.loadLinkList();
    
    // load list
    linkerFrontend.loadList();
    
    // output list to page
    
    // bind event on each added icon
    // - on category : min max display || select resource ?
    // - on resources : select resources
    
    // listen to browse events - binded with livequery as these item are added and removed to DOM
    $("#lnk_location a.navigable").livequery( 'click', function(){
        linkerFrontend.loadList($(this).attr("rel"), $(this).attr("title"));
        return false;
    });
    
    $("#lnk_resources a.navigable").livequery( 'click', function(){
        linkerFrontend.loadList($(this).attr("rel"), $(this).attr("title"));
        return false;
    });
    
    // listen to attach events
    $("#lnk_resources a.linkable").livequery( 'click', function(){
        if( ($(this).attr('class')) == 'linkable invisible' )
        {
            if( linkerFrontend.alertVisible( false ) )
            {
                linkerFrontend.select($(this).attr("id"), $(this).attr("title"));
            }
            else
            {
                return false;
            }
        }
        else
        {
            linkerFrontend.select($(this).attr("id"), $(this).attr("title"));
        }
        return false;
    });
    // listen to detach events
    $("#lnk_selected_resources div a").livequery( 'click', function(){
        linkerFrontend.unselect($(this).attr("rel"));
        return false;
    });
    
    // listen to close events (min/max display)
    // do not use livequery here as these items always exists in DOM
    $("#lnk_show_browser").click(function(){
        $("#lnk_browser").show();
        // toggle commands
        $("#lnk_show_browser").hide();
        $("#lnk_hide_browser").show();
    });
    
    $("#lnk_hide_browser").click(function(){
        $("#lnk_browser").hide();
        // toggle commands
        $("#lnk_hide_browser").hide();
        $("#lnk_show_browser").show();
    });
    
    // ajax activity led
    $("#lnk_ajax_loading").ajaxStart(function(){
        $(this).show();
    });
        
    $("#lnk_ajax_loading").ajaxStop(function(){
        $(this).hide();
    });
    

});

var linkerFrontend = {

    // vars
    selected : {},
    history : [],
    base_url : '',
    deleteIconUrl : '',
    invisibleIconUrl : '',
    currentIdx : 0,
    currentCrl: '',
    
    // methods
    
    loadLinkList : function(){
        var url = this.base_url + '?cmd=getLinkList';
        
        if( linkerFrontend.currentCrl )
        {
            url = url + '&crl=' + escape(linkerFrontend.currentCrl);
        }
        
        $.getJSON( url, function(response){
            if ( !Claroline.json.isResponse(response) ){
                alert("Invalid response");
                return;
            }
            
            if ( Claroline.json.isError(response) ){
                Claroline.json.handleJsonError( response );
                return;
            }
            
            var data = Claroline.json.getResponseBody( response );
            
            // alert( data.toSource() );
            
            if ( data.length ) {
                for ( var i = 0; i < data.length; i++ ) {
                    linkerFrontend.addSelected( data[i].crl, data[i].name );
                }
            }
        })
    },
   
    loadList : function(crl, resourceName ) {
        var url = this.base_url;
        
        if( typeof crl != 'undefined' )
        {
            url = url + '?crl=' + escape(crl);
        }
        
        $.getJSON( url,
            function(response){
                
                if ( !Claroline.json.isResponse(response) ){
                    alert("Invalid response");
                    return;
                }
                
                if ( Claroline.json.isError(response) ){
                    Claroline.json.handleJsonError( response );
                    return;
                }
                
                var data = Claroline.json.getResponseBody( response );
                
                if( typeof resourceName == 'undefined' )
                {
                    resourceName = data.name;
                }
                
                var current;
                
                // alert( linkerFrontend.history.toSource() );
                
                if ( ! linkerFrontend.inHistory(data.crl) ){
                    linkerFrontend.history.push({ crl: data.crl, fullname:data.name, name: resourceName });
                }
                
                // alert( linkerFrontend.history.toSource() );
                
                if ( crl ) {
                    while( ( current = linkerFrontend.history.pop() ) ){
                        // alert( current.crl );
                        // alert( crl );
                        if ( current.crl == crl ){
                            linkerFrontend.history.push( current );
                            break;
                        }
                    }
                }
                
                // alert( linkerFrontend.history.toSource() );
                
                linkerFrontend.renderBreadcrumbs( data.name );
                
                // 
                
                $("#lnk_back_link").empty();
                
                if ( linkerFrontend.history.length > 1 )
                {
                    // alert( linkerFrontend.history.toSource() );
                    
                    $("<a />")
                        .text('['+Claroline.getLang('Up')+']')
                        .attr("onclick", "linkerFrontend.loadList('"+data.parent+"');return false;")
                        .appendTo("#lnk_back_link")
                        ;
                }
                else
                {
                    $("<br />")
                        .appendTo("#lnk_back_link")
                        ;
                }
                
                $("#lnk_resources").empty();
                
                var currentResource;
                for ( var x in data.resources ) {
                    currentResource = data.resources[x];
                    /* 
                        "name":"Course description"
                        "icon":"\/~fragile\/claroline\/claroline\/course_description\/icon.png"
                        "crl":"crl:\/\/claroline.net\/ca801b57eca5b49e077071709f42c924\/EXAMPLE_003\/CLDSC"
                        "parent":"crl:\/\/claroline.net\/ca801b57eca5b49e077071709f42c924\/EXAMPLE_003"
                        "isVisible":true
                        "isLinkable":true
                        "isNavigable":false
                    */
                    visibleClass = 'visible';
                    if( ! currentResource.isVisible )
                    {
                        visibleClass = 'invisible';
                    }
  
                    // style for !isVisible to add on a and span
                    if( currentResource.isNavigable )
                    {
                        $("#lnk_resources")
                            .append('<a class="navigable '+ visibleClass +'" rel="'+currentResource.crl+'" title="'+currentResource.name+'">'+currentResource.name+'</a>');
                    }
                    else
                    {
                         // !isNavigable
                         $("#lnk_resources")
                          .append('<span class="'+ visibleClass +'">'+currentResource.name+'</span>');
                    }
                    if( ! currentResource.isVisible )
                    {
                        $("#lnk_resources")
                            .append( ' <img src="'+ linkerFrontend.invisibleIconUrl +'" alt="" />')
                            ;                     
                    }
                    if( currentResource.isLinkable )
                    {/*
                         $("<a />")
                         .text(' [Attach]')
                         .attr("title",currentResource.name)
                         .attr("onclick", "linkerFrontend.select('"+currentResource.crl+"','"+currentResource.name+"');return false;")
                         .appendTo("#lnk_resources")
                         ;*/
                          $("#lnk_resources")
                          .append(' <a class="linkable '+ visibleClass +'" id="'+currentResource.crl+'" title="'+currentResource.name+'">['+Claroline.getLang('Attach')+']</a>');
                    }
                    
                    $("#lnk_resources").children().css('cursor','pointer');
                    
                    $("<br />").appendTo("#lnk_resources"); 
                  }
              });
    },
    
    inHistory: function( crl ){
        for ( var idx = 0; idx < linkerFrontend.history.length; idx++ ) {
            if ( linkerFrontend.history[idx].crl == crl ){
                return true;
            }
        }
        
        return false;
    },
    
    renderBreadcrumbs: function( name ) {
        $("#lnk_location").empty();
        
        var links = [];
        
        for ( var idx = 0; idx < linkerFrontend.history.length; idx++ ) {
            links.push('<a class="breadcrumb navigable" href="#" rel="'+linkerFrontend.history[idx].crl+'" title="'+linkerFrontend.history[idx].name+'">'+linkerFrontend.history[idx].name+'</a>');
        }
        
        $("#lnk_location")
            .append(links.join(' &gt; '));
    },
    
    submit : function() {
        // add each selected resource to form before submitting it
    },
    
    select : function( crl, name ) {
        // mark a resource as selected
        // - add it to selected array
        this.selected[crl] = name;
        // - repaint list of selected resources
        this.addSelected(crl, name);
    },
    
    unselect : function(crl) {
        // mark a resource as not selected
        // - remove it from selected array
        delete this.selected[crl];
        // - repaint list of selected resources
        this.removeSelected(crl);
    },
    
    unselectAll : function() {
        // - remove all resources from selected array
        // - repaint list of selected resources
    },
    
    
    // rendering methods
    
    renderSelected : function() {
        $("#lnk_selected_resources").empty();
        var i=0;
        for ( var x in this.selected ) {
            // ajouter chemin complet
             // add element in displayed list
             $("#lnk_selected_resources")
             .append('<div id="'+x+'"><a href="#" rel="'+x+'"><img src="'+this.deleteIconUrl+'" alt="'+ Claroline.getLang('Delete') +'" /></a>'+this.selected[x]+'</div>');
             
             // add a form element
             $("#lnk_hidden_fields")
             .append('<input name="resourceList['+i+']" value="'+x+'" type="hidden">');
             
             i++;
        }
    },
    
    addSelected : function(crl, name) {
        var alreadyDisplayed = false;
        
        $("#lnk_selected_resources div a").each(function(i){
            if( $(this).attr('rel') == crl ) {
                alreadyDisplayed = true;
            }
        });
        
        if( ! alreadyDisplayed )
        {
            $("#lnk_selected_resources")
            .append('<div id="'+crl+'"><a href="#" rel="'+crl+'"><img src="'+this.deleteIconUrl+'" alt="'+ Claroline.getLang('Delete')+'" /></a>'+name+'</div>');

            // add a form element
            $("#lnk_hidden_fields")
            .append('<input name="resourceList['+ this.currentIdx +']" value="'+crl+'" type="hidden">');

            this.currentIdx++;
        }
    },
    
    removeSelected : function(crl) {
        // find the a with crl as rel
        // remove the div enclosing the a
        $("#lnk_selected_resources div a").each(function(i){
          if( $(this).attr('rel') == crl ) {
              $(this).parent().remove();
          }
        });
        
        // same for input hidden field
        $("#lnk_hidden_fields input").each(function(i){
          if( $(this).attr('value') == crl ) {
              $(this).remove();
          }
        });
    },
    
    alertVisible : function( visibility ) {
        //Popup a confirm message when the resource is invisible.
        return confirm( 'The resource is invisible. Are you sure that you want to attack this resource ?' );
    }
}