/**
  @license html2canvas v0.33 <http://html2canvas.hertzen.com>
  Copyright (c) 2011 Niklas von Hertzen. All rights reserved.
  http://www.twitter.com/niklasvh

  Released under MIT License
 */
 function dataURItoBlob(dataURI) {
    // convert base64 to raw binary data held in a string
    // convert base64/URLEncoded data component to raw binary data held in a string
	var byteString;
	if (dataURI.split(',')[0].indexOf('base64') >= 0)
		byteString = atob(dataURI.split(',')[1]);
	else
		byteString = unescape(dataURI.split(',')[1]);

    // separate out the mime component
    var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]

    // write the bytes of the string to an ArrayBuffer
    var ab = new ArrayBuffer(byteString.length);
    var ia = new Uint8Array(ab);
    for (var i = 0; i < byteString.length; i++) {
        ia[i] = byteString.charCodeAt(i);
    }

    // write the ArrayBuffer to a blob, and you're done
    var bb = new BlobBuilder();
    bb.append(ab);
    return bb.getBlob(mimeString);
}
/*
 * jQuery helper plugin for examples and tests
 */
(function( $ ){
    $.fn.html2canvas = function(options) {
        if (options && options.profile && window.console && window.console.profile) {
            console.profile();
        }
        var date = new Date(),
        $message = null,
        timeoutTimer = false,
        timer = date.getTime();
        options = options || {};
        options.elements = this;
        options.flashcanvas = "../external/flashcanvas.min.js";
        
        html2canvas.logging = options && options.logging;
        options.complete = function(images){
            var queue = html2canvas.Parse(this[0], images, options),
            $canvas = $(html2canvas.Renderer(queue, options)),
            finishTime = new Date();

            if (options && options.profile && window.console && window.console.profileEnd) {
                console.profileEnd();
            }
			
            $canvas.attr('id','id-screenshot').css({
                position: 'absolute', 
                left: 0, 
                top: 0
            }).appendTo(document.body);
            //$canvas.siblings().toggle();

            /*$(window).click(function(){
                $canvas.toggle().siblings().toggle();
                throwMessage("Canvas Render " + ($canvas.is(':visible') ? "visible" : "hidden"));
            });*/
            //throwMessage('Screenshot created in '+ ((finishTime.getTime()-timer)) + " ms<br />",4000);
            
            // test if canvas is read-able
            try {
                var dataURL = document.getElementById('id-screenshot').toDataURL('image/jpeg', 0.7);
				$('#id-screenshot').remove();
				send_feedback(dataURL);
            } catch(e) {
                if ($canvas[0].nodeName.toLowerCase() === "canvas") {
                    // TODO, maybe add a bit less offensive way to present this, but still something that can easily be noticed
                    alert("Canvas is tainted, unable to read data");
                }
            }
			
			
        };
        html2canvas.Preload(this[0],  options);

        function throwMessage(msg,duration){
            window.clearTimeout(timeoutTimer);
            timeoutTimer = window.setTimeout(function(){
                $message.fadeOut(function(){
                    $message.remove();
                    $message = null;
                });
            },duration || 2000);
            if ($message)
                $message.remove();
            $message = $('<div />').html(msg).css({
                margin:0,
                padding:10,
                background: "#000",
                opacity:0.7,
                position:"fixed",
                top:10,
                right:10,
                fontFamily: 'Tahoma',
                color:'#fff',
                fontSize:12,
                borderRadius:12,
                width:'auto',
                height:'auto',
                textAlign:'center',
                textDecoration:'none',
                display:'none'
            }).appendTo(document.body).fadeIn();
            html2canvas.log(msg);
        }
    };
})( jQuery );