/**
 * MF (2011-08-29):
 * I have modified this component to fix cosmetic bugs, as the AjaxUpload
 * component no longer is maintained. The closest available component is
 * FileUploader -- available at http://github.com/valums/file-uploader.
 *
 */



/**
 * Ajax upload
 * Project page - http://valums.com/ajax-upload/
 * Copyright (c) 2008 Andris Valums, http://valums.com
 * Licensed under the MIT license (http://valums.com/mit-license/)
 * Version 3.7 (09.07.2009)
 */

/**
 * Changes from the previous version:
 * 1. Fixed minor bug where click outside the button
 * would open the file browse window
 * 2. Fixed Upload hanging in Safari
 * http://blog.airbladesoftware.com/2007/8/17/note-to-self-prevent-uploads-hanging-in-safari
 * 3. Added hoverClass parameter
 *
 * For the full changelog please visit:
 * http://valums.com/ajax-upload-changelog/
 */

(function(){

var d = document, w = window;

/**
 * Get element by id
 */
function get(element){
	if (typeof element == "string")
		element = d.getElementById(element);
	return element;
}

/**
 * Attaches event to a dom element
 */
function addEvent(el, type, fn){
	if (w.addEventListener){
		el.addEventListener(type, fn, false);
	} else if (w.attachEvent){
		var f = function(){
		  fn.call(el, w.event);
		};
		el.attachEvent('on' + type, f)
	}
}


/**
 * Creates and returns element from html chunk
 */
var toElement = function(){
	var div = d.createElement('div');
	return function(html){
		div.innerHTML = html;
		var el = div.childNodes[0];
		div.removeChild(el);
		return el;
	}
}();

function hasClass(ele,cls){
	return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
function addClass(ele,cls) {
	if (!hasClass(ele,cls)) ele.className += " "+cls;
}
function removeClass(ele,cls) {
	var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
	ele.className=ele.className.replace(reg,' ');
}

// getInternetExplorerVersion copied from http://msdn.microsoft.com/en-us/library/ms537509%28v=vs.85%29.aspx
function getInternetExplorerVersion()
	//Returns the version of Internet Explorer or a -1
	//(indicating the use of another browser).
	{
	var rv = -1; // Return value assumes failure.
	if (navigator.appName == 'Microsoft Internet Explorer')
	{
	 var ua = navigator.userAgent;
	 var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
	 if (re.exec(ua) != null)
	   rv = parseFloat( RegExp.$1 );
	}
	return rv;
}

// getOffset function copied from jQuery lib (http://jquery.com/)
if (document.documentElement["getBoundingClientRect"]){
	// Get Offset using getBoundingClientRect
	// http://ejohn.org/blog/getboundingclientrect-is-awesome/
	var getOffset = function(el){
		var box = el.getBoundingClientRect(),
		doc = el.ownerDocument,
		body = doc.body,
		docElem = doc.documentElement,

		// for ie
		clientTop = docElem.clientTop || body.clientTop || 0,
		clientLeft = docElem.clientLeft || body.clientLeft || 0,

		// In Internet Explorer 7 getBoundingClientRect property is treated as physical,
		// while others are logical. Make all logical, like in IE8.

		zoom = 1;

		if (body.getBoundingClientRect) {
			var bound = body.getBoundingClientRect();
			zoom = (bound.right - bound.left)/body.clientWidth;
		}

		if (zoom > 1){
			clientTop = 0;
			clientLeft = 0;
		}

		var top = box.top/zoom + (window.pageYOffset || docElem && docElem.scrollTop/zoom || body.scrollTop/zoom) - clientTop,
		left = box.left/zoom + (window.pageXOffset|| docElem && docElem.scrollLeft/zoom || body.scrollLeft/zoom) - clientLeft;

		return {
			top: top,
			left: left
		};
	}

} else {
	// Get offset adding all offsets
	var getOffset = function(el){
		if (w.jQuery){
			return jQuery(el).offset();
		}

		var top = 0, left = 0;
		do {
			top += el.offsetTop || 0;
			left += el.offsetLeft || 0;
		}
		while (el = el.offsetParent);

		return {
			left: left,
			top: top
		};
	}
}

function getBox(el){
	var left, right, top, bottom;
	var offset = getOffset(el);
	left = offset.left;
	top = offset.top;

	right = left + el.offsetWidth;
	bottom = top + el.offsetHeight;

	return {
		left: left,
		right: right,
		top: top,
		bottom: bottom
	};
}

/**
 * Function generates unique id
 */
var getUID = function(){
	var id = 0;
	return function(){
		return 'ValumsAjaxUpload' + id++;
	}
}();

function fileFromPath(file){
	return file.replace(/.*(\/|\\)/, "");
}

function getExt(file){
	return (/[.]/.exec(file)) ? /[^.]+$/.exec(file.toLowerCase()) : '';
}

/**
 * Cross-browser way to get xhr object
 */
var getXhr = function(){
	var xhr;

	return function(){
		if (xhr) return xhr;

		if (typeof XMLHttpRequest !== 'undefined') {
			xhr = new XMLHttpRequest();
		} else {
			var v = [
				"Microsoft.XmlHttp",
				"MSXML2.XmlHttp.5.0",
				"MSXML2.XmlHttp.4.0",
				"MSXML2.XmlHttp.3.0",
				"MSXML2.XmlHttp.2.0"
			];

			for (var i=0; i < v.length; i++){
				try {
					xhr = new ActiveXObject(v[i]);
					break;
				} catch (e){}
			}
		}

		return xhr;
	}
}();

// Ensures inline elements become the equivalent inline-block element, so that
// overflow: hidden is still effective ... IE6/7 doesn't need this.
var ensureInlineIsBlockInline = function(element) {
	if (getInternetExplorerVersion() != -1 && getInternetExplorerVersion() < 8)
		return;

    if ((element.currentStyle ? element.currentStyle.display : getComputedStyle(element, null).display) == 'inline') {
    	element.style.display = 'inline-block';
    	// This is targeted at WebKit browsers, but doesn't hurt the others
    	// (unless you're using Firefox and your text is semitransparent!)
    	// Note: 'inherit' is good because it preserves hover states as well
    	if (element.parentNode.tagName.toLowerCase() == 'a')
        	element.style.textDecoration = 'inherit';

        if (getInternetExplorerVersion() == -1 || getInternetExplorerVersion() >= 8)
    		element.style.verticalAlign = 'bottom';

    	element.style.zoom = '1';
    }
}

// Please use AjaxUpload , Ajax_upload will be removed in the next version
Ajax_upload = AjaxUpload = function(button, options){
	if (button.jquery){
		// jquery object was passed
		button = button[0];
	} else if (typeof button == "string" && /^#.*/.test(button)){
		button = button.slice(1);
	}
	button = get(button);

	this._input = null;
	this._button = button;
	this._element = button; /* Using fileuploader.js's createInput, which uses this._element */
	this._disabled = false;
	this._submitting = false;
	// Variable changes to true if the button was clicked
	// 3 seconds ago (requred to fix Safari on Mac error)
	this._justClicked = false;
	this._parentDialog = d.body;

	if (window.jQuery && jQuery.ui && jQuery.ui.dialog){
		var parentDialog = jQuery(this._button).parents('.ui-dialog');
		if (parentDialog.length){
			this._parentDialog = parentDialog[0];
		}
	}

	this._settings = {
		// Location of the server-side upload script
		action: 'upload.php',
		// File upload name
		name: 'userfile',
		// Additional data to send
		data: {},
		// Submit file as soon as it's selected
		autoSubmit: true,
		// The type of data that you're expecting back from the server.
		// Html and xml are detected automatically.
		// Only useful when you are using json data as a response.
		// Set to "json" in that case.
		responseType: false,
		// Location of the server-side script that fixes Safari
		// hanging problem returning "Connection: close" header
		closeConnection: '',
		// Class applied to button when mouse is hovered
		hoverClass: 'qq-upload-button-hover',
		// Class applied to button when button is focused
		hoverClass: 'qq-upload-button-focus',
		// When user selects a file, useful with autoSubmit disabled
		onChange: function(file, extension){},
		// Callback to fire before file is uploaded
		// You can return false to cancel upload
		onSubmit: function(file, extension){},
		// Fired when file upload is completed
		// WARNING! DO NOT USE "FALSE" STRING AS A RESPONSE!
		onComplete: function(file, response) {}
	};

	// Merge the users options with our defaults
	for (var i in options) {
		this._settings[i] = options[i];
	}

    var elementStyles = {
        position: 'relative',
        overflow: 'hidden',
        zoom: '1',
        // Make sure browse button is in the right side
        // in Internet Explorer
        direction: 'ltr'
    };
    ensureInlineIsBlockInline(this._element);
	for (var i in elementStyles){
		this._element.style[i] = elementStyles[i];
	}

	this._createInput();
}

// assigning methods to our class
AjaxUpload.prototype = {
	setData : function(data){
		this._settings.data = data;
	},
	disable : function(){
		this._disabled = true;
	},
	enable : function(){
		this._disabled = false;
	},
	// removes ajaxupload
	destroy : function(){
		if(this._input){
			if(this._input.parentNode){
				this._input.parentNode.removeChild(this._input);
			}
			this._input = null;
		}
	},
	/**
	 * Creates invisible file input above the button
	 */
	/* MF (2011-08-29) This function was patched in from fileuploader.js, which gets it right */
    _createInput: function(){
        var self = this;
        var input = document.createElement("input");

        input.setAttribute("type", "file");
        input.setAttribute("name", this._settings.name);

        var inputStyles = {
            position: 'absolute',
            // in Opera only 'browse' button
            // is clickable and it is located at
            // the right side of the input
            right: 0,
            top: 0,
            fontFamily: 'Arial',
            // 4 persons reported this, the max values that worked for them
            // were 243, 236, 236, 118
            fontSize: '118px',
            margin: 0,
            padding: 0,
            cursor: 'pointer',
            opacity: 0,
            '-moz-opacity': 0,
            '-ms-filter': 'progid:DXImageTransform.Microsoft.Alpha(Opacity=0)',
            filter: 'alpha(opacity: 0)'
        };
		for (var i in inputStyles){
			input.style[i] = inputStyles[i];
		}

        this._element.appendChild(input);

		addEvent(input, 'change', function(){
			// get filename from input
			var file = fileFromPath(this.value);
			if(self._settings.onChange.call(self, file, getExt(file)) == false ){
				return;
			}
			// Submit form when value is changed
			if (self._settings.autoSubmit){
				self.submit();
			}
		});

		// Fixing problem with Safari
		// The problem is that if you leave input before the file select
		// dialog opens it does not upload the file.
		// As dialog opens slowly (it is a sheet dialog which takes some time
		// to open) there is some time while you can leave the button.
		// So we should not change display to none immediately

		addEvent(input, 'click', function(){
			self.justClicked = true;
			setTimeout(function(){
				// we will wait 3 seconds for dialog to open
				self.justClicked = false;
			}, 2500);
		});

        addEvent(input, 'mouseover', function(){
            addClass(self._element, self._settings.hoverClass);
        });
        addEvent(input, 'mouseout', function(){
            removeClass(self._element, self._settings.hoverClass);
        });
        addEvent(input, 'focus', function(){
            addClass(self._element, self._settings.focusClass);
        });
        addEvent(input, 'blur', function(){
            removeClass(self._element, self._settings.focusClass);
        });

        // IE and Opera, unfortunately have 2 tab stops on file input
        // which is unacceptable in our case, disable keyboard access
        if (window.attachEvent){
            // it is IE or Opera
            input.setAttribute('tabIndex', "-1");
        }

        this._input = input;
    },
	/**
	 * Creates iframe with unique name
	 */
	_createIframe : function(){
		// unique name
		// We cannot use getTime, because it sometimes return
		// same value in safari :(
		var id = getUID();

		// Remove ie6 "This page contains both secure and nonsecure items" prompt
		// http://tinyurl.com/77w9wh
		var iframe = toElement('<iframe src="javascript:false;" name="' + id + '" />');
		iframe.id = id;
		iframe.style.display = 'none';
		d.body.appendChild(iframe);
		return iframe;
	},
	/**
	 * Upload file without refreshing the page
	 */
	submit : function(){
		var self = this, settings = this._settings;

		if (this._input.value === ''){
			// there is no file
			return;
		}

		// get filename from input
		var file = fileFromPath(this._input.value);

		// execute user event
		if (! (settings.onSubmit.call(this, file, getExt(file)) == false)) {
			// Create new iframe for this submission
			var iframe = this._createIframe();

			// Do not submit if user function returns false
			var form = this._createForm(iframe);
			form.appendChild(this._input);

			// A pretty little hack to make uploads not hang in Safari. Just call this
			// immediately before the upload is submitted. This does an Ajax call to
			// the server, which returns an empty document with the "Connection: close"
			// header, telling Safari to close the active connection.
			// http://blog.airbladesoftware.com/2007/8/17/note-to-self-prevent-uploads-hanging-in-safari
			if (settings.closeConnection && /AppleWebKit|MSIE/.test(navigator.userAgent)){
				var xhr = getXhr();
				// Open synhronous connection
				xhr.open('GET', settings.closeConnection, false);
				xhr.send('');
			}

			form.submit();

			d.body.removeChild(form);
			form = null;
			this._input = null;

			// create new input
			this._createInput();

			var toDeleteFlag = false;

			addEvent(iframe, 'load', function(e){

				if (// For Safari
					iframe.src == "javascript:'%3Chtml%3E%3C/html%3E';" ||
					// For FF, IE
					iframe.src == "javascript:'<html></html>';"){

					// First time around, do not delete.
					if( toDeleteFlag ){
						// Fix busy state in FF3
						setTimeout( function() {
							d.body.removeChild(iframe);
						}, 0);
					}
					return;
				}

				var doc = iframe.contentDocument ? iframe.contentDocument : frames[iframe.id].document;

				// fixing Opera 9.26
				if (doc.readyState && doc.readyState != 'complete'){
					// Opera fires load event multiple times
					// Even when the DOM is not ready yet
					// this fix should not affect other browsers
					return;
				}

				// fixing Opera 9.64
				if (doc.body && doc.body.innerHTML == "false"){
					// In Opera 9.64 event was fired second time
					// when body.innerHTML changed from false
					// to server response approx. after 1 sec
					return;
				}

				var response;

				if (doc.XMLDocument){
					// response is a xml document IE property
					response = doc.XMLDocument;
				} else if (doc.body){
					// response is html document or plain text
					response = doc.body.innerHTML;
					if (settings.responseType && settings.responseType.toLowerCase() == 'json'){
						// If the document was sent as 'application/javascript' or
						// 'text/javascript', then the browser wraps the text in a <pre>
						// tag and performs html encoding on the contents.  In this case,
						// we need to pull the original text content from the text node's
						// nodeValue property to retrieve the unmangled content.
						// Note that IE6 only understands text/html
						if (doc.body.firstChild && doc.body.firstChild.nodeName.toUpperCase() == 'PRE'){
							response = doc.body.firstChild.firstChild.nodeValue;
						}
						if (response) {
							response = window["eval"]("(" + response + ")");
						} else {
							response = {};
						}
					}
				} else {
					// response is a xml document
					var response = doc;
				}

				settings.onComplete.call(self, file, response);

				// Reload blank page, so that reloading main page
				// does not re-submit the post. Also, remember to
				// delete the frame
				toDeleteFlag = true;

				// Fix IE mixed content issue
				iframe.src = "javascript:'<html></html>';";
			});

		} else {
			// clear input to allow user to select same file
			// Doesn't work in IE6
			// this._input.value = '';
			d.body.removeChild(this._input);
			this._input = null;

			// create new input
			this._createInput();
		}
	},
	/**
	 * Creates form, that will be submitted to iframe
	 */
	_createForm : function(iframe){
		var settings = this._settings;

		// method, enctype must be specified here
		// because changing this attr on the fly is not allowed in IE 6/7
		var form = toElement('<form method="post" enctype="multipart/form-data"></form>');
		form.style.display = 'none';
		form.action = settings.action;
		form.target = iframe.name;
		d.body.appendChild(form);

		// Create hidden input element for each data key
		for (var prop in settings.data){
			var el = d.createElement("input");
			el.type = 'hidden';
			el.name = prop;
			el.value = settings.data[prop];
			form.appendChild(el);
		}
		return form;
	}
};
})();