/*
 ### jQuery Multiple File Upload Plugin v1.24 - 2008-01-14 ###
 By Diego A., http://www.fyneworks.com, diego@fyneworks.com
 
	Project: http://jquery.com/plugins/project/MultiFile/
 Website: http://www.fyneworks.com/jquery/multiple-file-upload/
 Forums:  http://www.nabble.com/jQuery-Multiple-File-Upload-f20931.html
 
	CHANGE LOG:
 12-April-2007: v1.1
                Added events and file extension validation
                See website for details.
 
 06-June-2007: v1.2
                Now works in Opera.
 
 12-June-2007: v1.21
                Preserves name of file input so all current server-side
                functions don't need to be changed on new installations.
 
 24-June-2007: v1.22
                Now works perfectly in Opera, thanks to Adrian Wróbel <adrian [dot] wrobel [at] gmail.com>
 
 10-Jan-2008: v1.24
                Fixed bug in event trigger - sending incorrect parameters to event handlers
 
 14-Jan-2008: v1.24
                Fixed bug 1251: http://plugins.jquery.com/project/comments/add/1251
 
 25-Jan-2008: v1.24
                Implemented feature request: http://plugins.jquery.com/node/1363
																The plugin now automatically intercepts ajaxSubmit function (form plugin)
																and disbales empty file input elements for submission
*/

/*# AVOID COLLISIONS #*/
if(jQuery) (function($){
/*# AVOID COLLISIONS #*/

 // Fix for Opera: 6-June-2007
 // Stop confusion between null, 'null' and 'undefined'
 function IsNull(i){
  return (i==null || i=='null' || i=='' || i=='undefined');
 };
 
 // extend jQuery - $.MultiFile hook
 $.extend($, {
  MultiFile: function( o /* Object */ ){
   return $("INPUT[@type='file'].multi").MultiFile(o);
  }
 });
 
 // extend jQuery function library
 $.extend($.fn, {
   
   // MultiFile function
   MultiFile: function( o /* Object */ ){
    // DEBUGGING: disable plugin
    //return false;
				
				
				//### http://plugins.jquery.com/node/1363
				// utility method to integrate this plugin with others...
				if(!$.MultiFile.intercepted) (function(ai){
     $.MultiFile.intercepted = {};
     for(var i=0;i<ai.length;i++){
						var func = ai[i];
						if(func){
							//console.log('TEST: Install interception for '+func+'');
							$.MultiFile.intercepted[func] = $.fn[func] || function(){};
							$.fn[func] = function(){
								LOG([ai,arguments]);
								//console.log('TEST: Intercepeted '+func+'');
								$('input:file').each(function(){
									var $this = $(this);
									if($this.val()=='') $this.addClass('tmpDisabled').disable();
								});
								//console.log('TEST: Executing original '+func+'');
								$.MultiFile.intercepted[func].apply( this, arguments );
								//console.log('TEST: Clean up after intercepting '+func+'');
								$('input:file.tmpDisabled').removeClass('tmpDisabled').enable();
								return this;
							}; // interception
						};// if func
					};// for each ai
				})([ 'ajaxSubmit' /* array of methods to intercept */ ]);
				//###
				
				
    // Bind to each element in current jQuery object
    return $(this).each(function(i){
					if(this._MultiFile) return;
					this._MultiFile = true;
					
       // BUG 1251 FIX: http://plugins.jquery.com/project/comments/add/1251
       // variable i would repeat itself on multiple calls to the plugin.
       // this would cause a conflict with multiple elements
       // changes scope of variable to global so id will be unique over n calls
       window.MultiFile = (window.MultiFile || 0) + 1;
       i = window.MultiFile;
       
       // Remember our ancestors...
       var MASTER = this;
       
       // Copy parent attributes - Thanks to Jonas Wagner
       // we will use this one to create new input elements
       var xCLONE = $(MASTER).clone();
       
       //#########################################
       // Find basic configuration in class string
       // debug???
       MASTER.debug = (MASTER.className.indexOf('debug')>0);
       // limit number of files that can be selected?
       if(IsNull(MASTER.max)){
        MASTER.max = $(MASTER).attr('maxlength');
        if(IsNull(MASTER.max)){
         MASTER.max = ((MASTER.className.match(/\b((max|limit)\-[0-9]+)\b/gi) || [''])[0]);
         if(IsNull(MASTER.max)){
          MASTER.max = -1;
         }else{
          MASTER.max = MASTER.max.match(/[0-9]+/gi)[0];
         }
        }
       };
       MASTER.max = new Number(MASTER.max);
       // limit extensions?
       if(!MASTER.accept){
        MASTER.accept = (MASTER.className.match(/\b(accept\-[\w\|]+)\b/gi)) || '';
        MASTER.accept = new String(MASTER.accept).replace(/^(accept|ext)\-/i,'');
       };
       //#########################################
       
       // DEBUGGING: report status in Firebug console
       /*DBG*/// MASTER.debug = true;
       /*DBG*/// if(MASTER.debug && console) console.log('MultipleFile Upload plugin debugging enabled on "'+(MASTER.id?'#':'')+''+(MASTER.id || MASTER.name)+'"');
       
       // Attach a bunch of events, jQuery style ;-)
       /*DBG*/// $.each("on,after".split(","), function(i,o){
       /*DBG*///  $.each("FileSelect,FileRemove,FileAppend".split(","), function(j,event){
       /*DBG*///   MASTER[o+event] = function(element, value, master){ // default event handlers just show debugging info...
       /*DBG*///    if(MASTER.debug && console) console.log('*** '+o+event+' *** DEFAULT HANDLER' +'\nElement:' +element.name+ '\nValue: ' +value+ '\nMaster: ' +master.name+ '');
       /*DBG*///   };
       /*DBG*///  });
       /*DBG*/// });
       
       // Setup a global event handler
       MASTER.trigger = function(event, element){
        var handler = MASTER[event];
        var value = $(element).attr('value');
        /*DBG*/// if(MASTER.debug && console) console.log('*** TRIGGER EVENT: '+event+' ***' +'\nCustom Handler:' +(handler ? 'Yes':'No') +'\nElement:' +element.name+ '\nValue: ' +value+ '\nMaster: ' +MASTER.name+ '');
        if(handler){
         var returnValue = handler(element, value, MASTER);
         if( returnValue!=null ) return returnValue;
        }
        return true;
       };
       
       
       // Initialize options
       if( typeof o == 'number' ){ o = {max:o}; };
       $.extend(MASTER, MASTER.data || {}, o);
       
       // Default properties - INTERNAL USE ONLY
       $.extend(MASTER, {
        STRING: MASTER.STRING || {}, // used to hold string constants
        n: 0, // How many elements are currently selected?
        instanceKey: 'multi', // Instance Key?
        generateID: function(z){ return MASTER.instanceKey+'_'+String(i)+'_'+String(z); }
       });
       
       // Visible text strings...
       // $file = file name (with path), $ext = file extension
       MASTER.STRING = $.extend({
        remove:'remove',
        denied:'You cannot select a $ext file.\nTry again...',
        selected:'File selected: $file'
       }, MASTER.STRING);
       
       
       // Setup dynamic regular expression for extension validation
       // - thanks to John-Paul Bader: http://smyck.de/2006/08/11/javascript-dynamic-regular-expresions/
       if(String(MASTER.accept).length>1){
        MASTER.rxAccept = new RegExp('\\.('+(MASTER.accept?MASTER.accept:'')+')$','gi');
       };
       
       // Create wrapper to hold our file list
       MASTER.wrapID = MASTER.instanceKey+'_'+i; // Wrapper ID?
       $(MASTER).wrap('<div id="'+MASTER.wrapID+'"></div>');
							MASTER.wrapper = $('#'+MASTER.wrapID+'');
							
							// Create a wrapper for the labels
							// this changes allows us to keep the files in the order they were selected
							MASTER.labels = $('<span id="'+MASTER.wrapID+'_labels"></span>');
							MASTER.wrapper.append(MASTER.labels);
							
       // Bind a new element
       MASTER.addSlave = function( slave, ii ){
        
        // Keep track of how many elements have been displayed
        MASTER.n++;
        
        // Add reference to master element
        slave.MASTER = MASTER;
        
        // Define element's ID and name (upload components need this!)
        slave.i = ii;
        slave.id = MASTER.generateID(slave.i);
        slave.name = (slave.name || $(MASTER).attr('name') || 'file') + (slave.i>0?slave.i:''); // same name as master element
        
        // If we've reached maximum number, disable input slave
        if( (MASTER.max != -1) && ((MASTER.n-1) > (MASTER.max)) ){ // MASTER.n Starts at 1, so subtract 1 to find true count
         slave.disabled = true;
        };
        
        // Remember most recent slave
        MASTER.curEle = slave;
        
        /// now let's use jQuery
        slave = $(slave);
        
        // Triggered when a file is selected
        slave.change(function(){
          
          //# Trigger Event! onFileSelect
          if(!MASTER.trigger('onFileSelect', this, MASTER)) return false;
          //# End Event!
          
          // check extension
          if(MASTER.accept){
           var v = String(slave.attr('value'));
           if(!v.match(MASTER.rxAccept)){
            // Clear element value by force damn you!
            slave.val('').attr('value', '')[0].value = '';
            
            // OPERA BUG FIX - 2007-06-24
            // Thanks to Adrian Wróbel <adrian [dot] wrobel [at] gmail.com>
            // we add new input element and remove present one for browsers that can't clear value of input element
            //var newEle = $('<input name="'+($(MASTER).attr('name') || '')+'" type="file"/>');
            var newEle = xCLONE.clone();// Copy parent attributes - Thanks to Jonas Wagner
            
            MASTER.n--;
            MASTER.addSlave(newEle[0], this.i);
            slave.parent().prepend(newEle);
            slave.remove();
            
            // Show error message
            // TO-DO: Some people have suggested alternative methods for displaying this message
            // such as inline HTML, lightbox, etc... maybe integrate with blockUI plugin?
            alert(MASTER.STRING.denied.replace('$ext', String(v.match(/\.\w{1,4}$/gi))));
            
            return false;
           }
          };
          
          // Create a new file input element
          //var newEle = $('<input name="'+($(MASTER).attr('name') || '')+'" type="file"/>');
          var newEle = xCLONE.clone();// Copy parent attributes - Thanks to Jonas Wagner
          
          // Hide this element (NB: display:none is evil!)
										$(this).css({ position:'absolute', left: '-3000px' });
          
										// Add new element to the form
										MASTER.labels.before(newEle);//.append(newEle);
          
          // Update list
          MASTER.addToList( this );
          
          // Bind functionality
          MASTER.addSlave( newEle[0], this.i+1 );
          
          //# Trigger Event! afterFileSelect
          if(!MASTER.trigger('afterFileSelect', this, MASTER)) return false;
          //# End Event!
          
        });
       
       };// MASTER.addSlave
       // Bind a new element
       
							
							
       // Add a new file to the list
       MASTER.addToList = function( slave ){
        
        //# Trigger Event! onFileAppend
        if(!MASTER.trigger('onFileAppend', slave, MASTER)) return false;
        //# End Event!
        
        // Create label elements
        var
         r = $('<div></div>'),
         v = $(slave).attr('value')+'',
         a = $('<span class="file" title="'+MASTER.STRING.selected.replace('$file', v)+'">'+v.match(/[^\/\\]+$/gi)[0]+'</span>'),
         b = $('<a href="#'+MASTER.wrapID+'">'+MASTER.STRING.remove+'</a>');
								
								// Insert label
								MASTER.labels.append(
         r//.prepend(slave.i+': ')
									.append('[', b, ']&nbsp;', a)
								);
        
        b.click(function(){
         
          //# Trigger Event! onFileRemove
          if(!MASTER.trigger('onFileRemove', slave, MASTER)) return false;
          //# End Event!
          
          MASTER.n--;
          MASTER.curEle.disabled = false;
          $('#'+MASTER.generateID(slave.i)).remove();
          $(this).parent().remove();
          
          //# Trigger Event! afterFileRemove
          if(!MASTER.trigger('afterFileRemove', slave, MASTER)) return false;
          //# End Event!
          
          return false;
        });
        
        //# Trigger Event! afterFileAppend
        if(!MASTER.trigger('afterFileAppend', slave, MASTER)) return false;
        //# End Event!
        
       }; // MASTER.addToList
       // Add element to selected files list
							
							
							
       // Bind functionality to the first element
       if(!MASTER.MASTER) MASTER.addSlave(MASTER, 0);
       
							// Increment control count
							MASTER.I++;
       MASTER.n++;
       
    });
    // each element
   
   }
   // MultiFile function
 
 });
 // extend jQuery function library



/*
 ### Default implementation ###
 The plugin will attach itself to file inputs
 with the class 'multi' when the page loads
	
	Use the jQuery start plugin to 
*/
/*
if($.start){ $.start('MultiFile', $.MultiFile) }
else $(function(){ $.MultiFile() });
*/
if($.start)
	$.start('MultiFile', function(context){ context = context || this; // attach to start-up
		$("INPUT[@type='file'].multi", context).MultiFile();
	});
// $.start
else
 $(function(){ $.MultiFile() });
// $()



/*# AVOID COLLISIONS #*/
})(jQuery);
/*# AVOID COLLISIONS #*/
