;if(window.jQuery) (function($){

 $.extend($, {
  MultiFile: function( o /* Object */ ){

   return $("input:file.multi").MultiFile(o);
  }
 });

 $.extend($.MultiFile, {
  options: {
   accept: '', max: -1,
   error: function(s){
     alert(s);
   },

   namePattern: '$name',

   STRING: {
    remove:'x',
    denied:'You cannot select a $ext file.\nTry again...',
    file:'$file',
    selected:'File selected: $file',
    duplicate:'This file has already been selected:\n$file'
   }
  }
 });

 $.extend($.MultiFile, {

  disableEmpty: function(klass){
   var o = [];
   $('input:file').each(function(){ if($(this).val()=='') o[o.length] = this; });
   return $(o).each(function(){ this.disabled = true }).addClass(klass || 'mfD');
  },

  reEnableEmpty: function(klass){
   klass = klass || 'mfD';
   return $('input:file.'+klass).removeClass(klass).each(function(){ this.disabled = false });
  },

  autoIntercept: [ 'submit', 'ajaxSubmit', 'validate'  ],
  intercepted: {},
  intercept: function(methods, context, args){
   var method, value; args = args || [];
   if(args.constructor.toString().indexOf("Array")<0) args = [ args ];
   if(typeof(methods)=='function'){
    $.MultiFile.disableEmpty();
    value = methods.apply(context || window, args);
    $.MultiFile.reEnableEmpty();
    return value;
   };
   if(methods.constructor.toString().indexOf("Array")<0) methods = [methods];
   for(var i=0;i<methods.length;i++){
    method = methods[i]+'';
    if(method) (function(method){
     $.MultiFile.intercepted[method] = $.fn[method] || function(){};
     $.fn[method] = function(){
      $.MultiFile.disableEmpty();
      value = $.MultiFile.intercepted[method].apply(this, arguments);
      $.MultiFile.reEnableEmpty();
      return value;
     };
    })(method);
   };
  }
 });

 $.extend($.fn, {

			reset: function(){ return this.each(function(){ try{ this.reset(); }catch(e){} }); },

   MultiFile: function( options /* Object */ ){

    if($.MultiFile.autoIntercept){
     $.MultiFile.intercept( $.MultiFile.autoIntercept  );
     $.MultiFile.autoIntercept = null;
    };

    return $(this).each(function(group_count){
     if(this._MultiFile) return; this._MultiFile = true;

       window.MultiFile = (window.MultiFile || 0) + 1;
       group_count = window.MultiFile;

       var MF = {e:this, E:$(this), clone:$(this).clone()};

       if(typeof options=='number') options = {max:options};
       if(typeof options=='string') options = {accept:options};
       var o = $.extend({},
        $.MultiFile.options,
        options || {},
        ($.meta ? MF.E.data() :
        ($.metadata ? MF.E.metadata() :
        null)) || {}
       );

       if(!(o.max>0)){
        o.max = MF.E.attr('maxlength');
        if(!(o.max>0) ){
         o.max = (String(MF.e.className.match(/\b(max|limit)\-([0-9]+)\b/gi) || ['']).match(/[0-9]+/gi) || [''])[0];
         if(!(o.max>0)) o.max = -1;
         else           o.max = String(o.max).match(/[0-9]+/gi)[0];
        }
       };
       o.max = new Number(o.max);

       o.accept = o.accept || MF.E.attr('accept') || '';
       if(!o.accept){
        o.accept = (MF.e.className.match(/\b(accept\-[\w\|]+)\b/gi)) || '';
        o.accept = new String(o.accept).replace(/^(accept|ext)\-/i,'');
       };

       $.extend(MF, o || {});
       MF.STRING = $.extend({},$.MultiFile.options.STRING,MF.STRING);

       $.extend(MF, {
        n: 0,
        slaves: [], files: [],
        instanceKey: MF.e.id || 'MultiFile'+String(group_count),
        generateID: function(z){ return MF.instanceKey + (z>0 ?'_F'+String(z):''); },
        trigger: function(event, element){
         var handler = MF[event], value = $(element).attr('value');
         if(handler){
          var returnValue = handler(element, value, MF);
          if( returnValue!=null ) return returnValue;
         }
         return true;
        }
       });

       if(String(MF.accept).length>1){
        MF.rxAccept = new RegExp('\\.('+(MF.accept?MF.accept:'')+')$','gi');
       };

       MF.wrapID = MF.instanceKey+'_wrap'; // Wrapper ID?
       MF.E.wrap('<div id="'+MF.wrapID+'"></div>');
       MF.wrapper = $('#'+MF.wrapID+'');

       MF.e.name = MF.e.name || 'file'+ group_count +'[]';


							if(!MF.list){

								MF.wrapper.append( '<span id="'+MF.wrapID+'_list"></span>' );
								MF.list = $('#'+MF.wrapID+'_list');
							};
       MF.list = $(MF.list);

       MF.addSlave = function( slave, slave_count ){

        MF.n++;

        slave.MF = MF;

        slave.i = slave_count;

        if(slave.i>0) slave.id = slave.name = null;

        slave.id = slave.id || MF.generateID(slave.i);

        slave.name = String(MF.namePattern
         /*master name*/.replace(/\$name/gi,MF.E.attr('name'))
         /*master id  */.replace(/\$id/gi,  MF.E.attr('id'))
         /*group count*/.replace(/\$g/gi,   (group_count>0?group_count:''))
         /*slave count*/.replace(/\$i/gi,   (slave_count>0?slave_count:''))
        );

        $(slave).val('').attr('value','')[0].value = '';

        if( (MF.max > 0) && ((MF.n-1) > (MF.max)) )
         slave.disabled = true;

        MF.current = MF.slaves[slave.i] = slave;

        slave = $(slave);

        $(slave).change(function(){

          $(this).blur();

          if(!MF.trigger('onFileSelect', this, MF)) return false;

          var ERROR = '', v = String(this.value || ''/*.attr('value)*/);

          if(MF.accept && v && !v.match(MF.rxAccept))//{
            ERROR = MF.STRING.denied.replace('$ext', String(v.match(/\.\w{1,4}$/gi)));

										for(var f in MF.slaves)//{
           if(MF.slaves[f] && MF.slaves[f]!=this)//{

            if(MF.slaves[f].value==v)//{
             ERROR = MF.STRING.duplicate.replace('$file', v.match(/[^\/\\]+$/gi));

          var newEle = $(MF.clone).clone();

          newEle.addClass('MultiFile');

          if(ERROR!=''){

            MF.error(ERROR);

            MF.n--;
            MF.addSlave(newEle[0], this.i);
            slave.parent().prepend(newEle);
            slave.remove();
            return false;
          };

          $(this).css({ position:'absolute', top: '-3000px' });

          MF.list.before(newEle);

          MF.addToList( this );

          MF.addSlave( newEle[0], this.i+1 );

          if(!MF.trigger('afterFileSelect', this, MF)) return false;

        });

       };

       MF.addToList = function( slave ){

        if(!MF.trigger('onFileAppend', slave, MF)) return false;

        var
         r = $('<div></div>'),
         v = String(slave.value || ''/*.attr('value)*/),
         a = $('<span class="file" title="'+MF.STRING.selected.replace('$file', v)+'">'+MF.STRING.file.replace('$file', v.match(/[^\/\\]+$/gi)[0])+'</span>'),
         b = $('<a href="#'+MF.wrapID+'">'+MF.STRING.remove+'</a>');

        MF.list.append(
         r.append(b, ' ', a)
        );

        b.click(function(){

          if(!MF.trigger('onFileRemove', slave, MF)) return false;

          MF.n--;
          MF.current.disabled = false;

										MF.slaves[slave.i] = null;
										$(slave).remove();
										$(this).parent().remove();

          $(MF.current).css({ position:'', top: '' });
										$(MF.current).reset().val('').attr('value', '')[0].value = '';

          if(!MF.trigger('afterFileRemove', slave, MF)) return false;

          return false;
        });

        if(!MF.trigger('afterFileAppend', slave, MF)) return false;

       };

       if(!MF.MF) MF.addSlave(MF.e, 0);

       MF.n++;

    });

   }

 });

 $(function(){ $.MultiFile() });

})(jQuery);