/**
 * Created by zhangyouce on 14-4-17.
 */
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(typeof uri== 'boolean'){
            // io.src = 'javascript:false';
            // }
            // else if(typeof uri== 'string'){
            // io.src = uri;
            // }

            //fix ie9 and ie 10-------------
            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, tag_name, tag_link, tag_sort, tag_status, tag_id)
    {
        //create form
        var formId = 'jUploadForm' + id;
        var fileId = 'jUploadFile' + id;
        //--
        var tagNameId = 'tag_name' + id;
        var tagLinkId = 'tag_link' + id;
        var tagSortId = 'tag_sort' + id;
        var tagStatusId = 'tag_status' + id;
        var tagIdId = 'tag_id' + id;
        //--end
        var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
        var oldElement = $('#' + fileElementId);
        var newElement = $(oldElement).clone();
        //--
        var tagNameElement = '<input type="text" name="tag_name" value="'+tag_name+'">';
        var tagLinkElement = '<input type="text" name="tag_link" value="'+tag_link+'">';
        var tagSortElement = '<input type="text" name="tag_sort" value="'+tag_sort+'">';
        var tagStatusElement = '<input type="text" name="tag_status" value="'+tag_status+'">';
        var tagIdElement = '<input type="text" name="tag_id" value="'+tag_id+'">';
        //--end
        $(oldElement).attr('id', fileId);
        $(oldElement).before(newElement);
        $(oldElement).appendTo(form);
        //--
        $(tagNameElement).appendTo(form);
        $(tagLinkElement).appendTo(form);
        $(tagSortElement).appendTo(form);
        $(tagStatusElement).appendTo(form);
        $(tagIdElement).appendTo(form);
        //--end
        //set attributes
        $(form).css('position', 'absolute');
        $(form).css('top', '-1200px');
        $(form).css('left', '-1200px');
        $(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 = new Date().getTime()
        var form = jQuery.createUploadForm(id, s.fileElementId, s.tag_name, s.tag_link, s.tag_sort, s.tag_status, s.tag_id);
        var io = jQuery.createUploadIframe(id, s.secureuri);
        var frameId = 'jUploadFrame' + id;
        var formId = 'jUploadForm' + id;
        // Watch for a new set of requests
        if ( s.global && ! jQuery.active++ )
        {
            jQuery.event.trigger( "ajaxStart" );
        }
        var requestDone = false;
        // Create the request object
        var xml = {}
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        // Wait for a response to come back
        var uploadCallback = function(isTimeout)
        {
            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 a local callback was specified, fire it and pass it the data
                        if ( s.success )
                            s.success( data, status );

                        // Fire the global callback
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
                        jQuery.handleError(s, xml, status);
                } catch(e)
                {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                }

                // The request was completed
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );

                // Process result
                if ( s.complete )
                    s.complete(xml, status);

                jQuery(io).unbind()

                setTimeout(function()
                {	try
                {
                    $(io).remove();
                    $(form).remove();

                } catch(e)
                {
                    jQuery.handleError(s, xml, null, e);
                }

                }, 100)

                xml = null

            }
        }
        // Timeout checker
        if ( s.timeout > 0 )
        {
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try
        {
            // var io = $('#' + frameId);
            var form = $('#' + formId);
            $(form).attr('action', s.url);
            $(form).attr('method', 'POST');
            $(form).attr('target', frameId);
            if(form.encoding)
            {
                form.encoding = 'multipart/form-data';
            }
            else
            {
                form.enctype = 'multipart/form-data';
            }
            $(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);
        }
        return {abort: function () {}};

    },

    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        data = jQuery(data).text();
        // If the type is "script", eval it in global context

//        if ( type == "script" )
//            jQuery.globalEval( data );
//        // Get the JavaScript object, if JSON is used.
//        if ( type == "json" )
//            eval( "data = " + data );
//        // evaluate scripts within html
//        if ( type == "html" )
//            jQuery("<div>").html(data).evalScripts();
//        //alert($('param', data).each(function(){alert($(this).attr('value'));}));
        return data;
    }
})

