// JavaScript Document
jQuery.extend({

    createUploadIframe: function(id, uri)
 {
   //create frame
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
                //var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
            	if(jQuery.browser.version=="9.0" || jQuery.browser.version=="10.0"){  
                    var io = document.createElement('iframe');  
                    io.id = frameId;  
                    io.name = frameId;  
                }else if(jQuery.browser.version=="6.0" || jQuery.browser.version=="7.0" || jQuery.browser.version=="8.0"){  
                    var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');  
	                if(typeof uri== 'boolean'){
	                    io.src = 'javascript:false';
	                }
	                else if(typeof uri== 'string'){
	                    io.src = uri;
	                }
                }
            }else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io;   
    },
    createUploadForm: function(id, fileElementId, data)
 {
  //create form 
  var formId = 'jUploadForm' + id;
  var fileId = 'jUploadFile' + id;
  var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 
  var oldElement = jQuery('#' + fileElementId);
  var newElement = jQuery(oldElement).clone();
  jQuery(oldElement).attr('id', fileId);
  jQuery(oldElement).before(newElement);
  jQuery(oldElement).appendTo(form);
  
  //add data
  if(data) { 
    for (var i in data) { 
        $('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); 
    } 
  }
  //set attributes
  jQuery(form).css('position', 'absolute');
  jQuery(form).css('top', '-1200px');
  jQuery(form).css('left', '-1200px');
  jQuery(form).appendTo('body');  
  return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = s.id;        
        //var id = s.fileElementId;        
		var form = jQuery.createUploadForm(id, s.fileElementId,s.data);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;  
        
		if( s.global && ! jQuery.active++ ){
			// Watch for a new set of requests
			jQuery.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        // Create the request object
        var xml = {};   
        if( s.global ){
         jQuery.event.trigger("ajaxSend", [xml, s]);
        }            
        
        var uploadCallback = function(isTimeout){  
			// Wait for a response to come back 
			var io = document.getElementById(frameId);
			try{    
				if(io.contentWindow){
					xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
					xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
			    }else if(io.contentDocument){
			    	xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
			    	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
			    }      
			}catch(e){
				jQuery.handleError(s, xml, null, e);
			}
            if( xml || isTimeout == "timeout"){    
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    // Make sure that the request was successful or notmodified
                    if( status != "error" ){
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = jQuery.uploadHttpData( xml, s.dataType );                        
                        if( s.success ){
                        	// ifa local callback was specified, fire it and pass it the data
                    		s.success( data, status );
                        };                 
                        if( s.global ){
                        	// Fire the global callback
                        	jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                        };                            
                    } else{
                     jQuery.handleError(s, xml, status);
                    }
                        
                } catch(e){
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                };                
                if( s.global ){
                	// The request was completed
            		jQuery.event.trigger( "ajaxComplete", [xml, s] );
                };

                // Handle the global AJAX counter
                if(s.global && ! --jQuery.active){
                 jQuery.event.trigger("ajaxStop");
                };
                if(s.complete){
                  s.complete(xml, status);
                };                 

                jQuery(io).unbind();
                setTimeout(function(){
                try{
					jQuery(io).remove();
					jQuery(form).remove(); 
                }catch(e){
		    	  	jQuery.handleError(s, xml, null, e);
            	}}, 100);
                xml = null;
            };
        }
        // Timeout checker
        if( s.timeout > 0 ){
            setTimeout(function(){if(!requestDone ){uploadCallback( "timeout" );}}, s.timeout);
        }
        try{
			var form = jQuery('#' + formId);
			jQuery(form).attr('action', s.url);
			jQuery(form).attr('method', 'POST');
			jQuery(form).attr('target', frameId);
            if(form.encoding){
                form.encoding = 'multipart/form-data';    
            }else{    
                form.enctype = 'multipart/form-data';
            }   
            jQuery(form).submit();

        } catch(e){   
            jQuery.handleError(s, xml, null, e);
        }
        /*if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        }   */
        jQuery('#' + frameId).load(uploadCallback);
        return {abort: function () {}}; 

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        // ifthe type is "script", eval it in global context
        if( type == "script" ){
         jQuery.globalEval( data );
        }
            
        // Get the JavaScript object, ifJSON is used.
        if( type == "json" ){
        	data = r.responseText;  
            var start = data.indexOf(">");  
            if(start != -1) {  
              var end = data.indexOf("<", start + 1);  
              if(end != -1) {  
                data = data.substring(start + 1, end);  
               }  
            }  
            eval( "data = " + data);  
        }
            
        // evaluate scripts within html
        if( type == "html" ){
         jQuery("<div>").html(data).evalScripts();
        }
            
        return data;
    },
    /*handleError: function( s, xml, status, e ) {
		// If a local callback was specified, fire it
		if ( s.error )
			s.error( xml, status, e );

		// Fire the global callback
		if ( s.global )
			jQuery.event.trigger( "ajaxError", [xml, s, e] );
	}*/
    handleError: function( s, xhr, status, e ) {
        // If a local callback was specified, fire it
        if ( s.error ) {
            s.error.call( s.context || s, xhr, status, e );
        }
        // Fire the global callback
        if ( s.global ) {
        	(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e] );
        }
    }
});
