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/**
 * 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 3.5 (23.06.2009)
 */

/**
 * Changes from the previous version:
 * 1. Added better JSON handling that allows to use 'application/javascript' as a response
 * 2. Added demo for usage with jQuery UI dialog
 * 3. Fixed IE "mixed content" issue when used with secure connections
 *
 * 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;
	}
}();

// 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
	};
}

/**
 * Crossbrowser mouse coordinates
 */
function getMouseCoords(e){
	// pageX/Y is not supported in IE
	// http://www.quirksmode.org/dom/w3c_cssom.html
	if (!e.pageX && e.clientX){
		// In Internet Explorer 7 some properties (mouse coordinates) are treated as physical,
		// while others are logical (offset).
		var zoom = 1;
		var body = document.body;

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

return {
			x: e.clientX / zoom + d.body.scrollLeft + d.documentElement.scrollLeft,
			y: e.clientY / zoom + d.body.scrollTop + d.documentElement.scrollTop
		};
	}

return {
		x: e.pageX,
		y: e.pageY
	};

}
/**
 * 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()) : '';
}

// 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._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,
		// 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];
	}

this._createInput();
	this._rerouteClicks();
}

// 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
	 */
	_createInput : function(){
		var self = this;
		var input = d.createElement("input");
		input.setAttribute('type', 'file');
		input.setAttribute('name', this._settings.name);
		var styles = {
			'position' : 'absolute'
			,'margin': '-5px 0 0 -175px'
			,'padding': 0
			,'width': '220px'
			,'height': '30px'
			,'fontSize': '14px'
			,'opacity': 0
			,'cursor': 'pointer'
			,'display' : 'none'
			,'zIndex' :  2147483583 //Max zIndex supported by Opera 9.0-9.2x
			// Strange, I expected 2147483647
		};
		for (var i in styles){
			input.style[i] = styles[i];
		}

// Make sure that element opacity exists
		// (IE uses filter instead)
		if ( ! (input.style.opacity === "0")){
			input.style.filter = "alpha(opacity=0)";
		}

this._parentDialog.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;
			}, 3000);
		});

this._input = input;
	},
	_rerouteClicks : function (){
		var self = this;

// IE displays 'access denied' error when using this method
		// other browsers just ignore click()
		// addEvent(this._button, 'click', function(e){
		//   self._input.click();
		// });

var box, dialogOffset = {top:0, left:0}, over = false;
		addEvent(self._button, 'mouseover', function(e){
			if (!self._input || over) return;
			over = true;
			box = getBox(self._button);

if (self._parentDialog != d.body){
				dialogOffset = getOffset(self._parentDialog);
			}
		});

// we can't use mouseout on the button,
		// because invisible input is over it
		addEvent(document, 'mousemove', function(e){
			var input = self._input;
			if (!input || !over) return;

if (self._disabled){
				removeClass(self._button, 'hover');
				input.style.display = 'none';
				return;
			}

var c = getMouseCoords(e);

if ((c.x >= box.left) && (c.x <= box.right) &&
			(c.y >= box.top) && (c.y <= box.bottom)){
				input.style.top = c.y - dialogOffset.top + 'px';
				input.style.left = c.x - dialogOffset.left + 'px';
				input.style.display = 'block';
				addClass(self._button, 'hover');
			} else {
				// mouse left the button
				over = false;
				if (!self.justClicked){
					input.style.display = 'none';
				}
				removeClass(self._button, 'hover');
			}
		});

},
	/**
	 * 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);

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;
	}
};
})();