/*********
* Javascript for file upload demo
* Copyright (C) Tomas Larsson 2006
* http://tomas.epineer.se/

* Licence:
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
* 
* Software distributed under this License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*/
var uploads_in_progress = 0;
var sids = {};
var g_sid;
var g_upload_base = 'http://www.ascetinteractive.biz/upload/';

function beginUpload(ul) {			
	ul.form.submit();
	sids[ul.name] = g_sid;
	uploads_in_progress = uploads_in_progress + 1;
	var pb = $(ul.name + "_progress");
	Element.show(pb.parentNode);
	new Ajax.PeriodicalUpdater({}, g_upload_base + 'upload/fileprogress.php',{'decay': 2,'frequency' : 0.5,'method': 'post','parameters': 'sid=' + g_sid,'onSuccess' : function(request){updateProgress(pb,request)},'onFailure':function(request){updateFailure(pb,request)}})
}

function updateProgress(pb,req) {
	var percent = req.responseText;
	if(!percent) percent = 0;
	pb.style.width = percent;
	if(percent == "100") {
		var inp_id = pb.id.replace("_progress","");
		if(sids[inp_id]) {
			uploads_in_progress = uploads_in_progress - 1;
			
			
			new Ajax.Updater( 'dummy', g_upload_base + 'upload/receive.php', {method: 'post', parameters: 'sid=' + g_sid , onComplete: function(req){ fetchImageLibrary()}});
			initializeUpload();
			
			var inp = $(inp_id);
			if(inp) {
				inp.value = sids[inp_id];
			}
		}
		Element.hide(pb.parentNode);
		sids[inp_id] = false;
	}
}

function updateFailure(pb,req) {
	var mes = req.responseText;
	pb.style.width=0;
	//alert(mes);
	uploads_in_progress = uploads_in_progress - 1;
}

function submitUpload(frm) {
	if(uploads_in_progress > 0) {
		alert("File upload in progress. Please wait until upload finishes and try again.");
	} else {
		frm.submit();
	}
}

function initializeUpload () {
	g_sid = randomString();
	document.getElementById('myFile').action= g_upload_base + "upload/upload.cgi?sid=" + g_sid;
	$('imagefile').onChange = beginUpload;
}

function randomString() {
	var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
	var string_length = 8;
	var randomstring = '';
	for (var i=0; i<string_length; i++) {
		var rnum = Math.floor(Math.random() * chars.length);
		randomstring += chars.substring(rnum,rnum+1);
	}
	return randomstring;
}