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

  Released under MIT License
*/
"use strict";

var _html2canvas = {},
html2canvas;


function h2clog(a) {
    if (_html2canvas.logging && window.console && window.console.log) {
        window.console.log(a);
    }
}

_html2canvas.Util = {};

_html2canvas.Util.backgroundImage = function (src) {
  
    if (/data:image\/.*;base64,/i.test( src ) || /^(-webkit|-moz|linear-gradient|-o-)/.test( src )) {
        return src;
    }
    
    if (src.toLowerCase().substr( 0, 5 ) === 'url("') {
        src = src.substr( 5 );
        src = src.substr( 0, src.length - 2 );                 
    } else {
        src = src.substr( 4 );
        src = src.substr( 0, src.length - 1 );  
    }

    return src;  
};

_html2canvas.Util.Bounds = function getBounds (el) {
    var clientRect,
    bounds = {};
        
    if (el.getBoundingClientRect){	
        clientRect = el.getBoundingClientRect();

            
        // TODO add scroll position to bounds, so no scrolling of window necessary
        bounds.top = clientRect.top;
        bounds.bottom = clientRect.bottom || (clientRect.top + clientRect.height);
        bounds.left = clientRect.left;
        
        // older IE doesn't have width/height, but top/bottom instead
        bounds.width = clientRect.width || (clientRect.right - clientRect.left);
        bounds.height = clientRect.height || (clientRect.bottom - clientRect.top);
    
        return bounds;
            
    }  /*else{
           
           
            p = $(el).offset();       
          
            return {               
                left: p.left + getCSS(el,"borderLeftWidth", true),
                top: p.top + getCSS(el,"borderTopWidth", true),
                width:$(el).innerWidth(),
                height:$(el).innerHeight()                
            };
            

        }     */      
};

_html2canvas.Util.getCSS = function (el, attribute) {
    // return jQuery(el).css(attribute);
    /*
    var val,
    left,
    rsLeft = el.runtimeStyle && el.runtimeStyle[ attribute ],
    style = el.style;
    
    if ( el.currentStyle ) {
        val = el.currentStyle[ attribute ];
    } else if (window.getComputedStyle) {
        val = document.defaultView.getComputedStyle(el, null)[ attribute ];
    }
    */
    // Check if we are not dealing with pixels, (Opera has issues with this)
    // Ported from jQuery css.js
    // From the awesome hack by Dean Edwards
    // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291

    // If we're not dealing with a regular pixel number
    // but a number that has a weird ending, we need to convert it to pixels
    
    // if ( !/^-?\d+(?:px)?$/i.test( val ) && /^-?\d/.test( val ) ) {
    /*
        // Remember the original values
        left = style.left;

        // Put in the new values to get a computed value out
        if ( rsLeft ) {
            el.runtimeStyle.left = el.currentStyle.left;
        }
        style.left = attribute === "fontSize" ? "1em" : (val || 0);
        val = style.pixelLeft + "px";

        // Revert the changed values
        style.left = left;
        if ( rsLeft ) {
            el.runtimeStyle.left = rsLeft;
        }*/
    // val = $(el).css(attribute);
    // }
    
    /*
    var val = $(el).css(attribute);
    
    if (val === "medium") {
        val = 3;
    }*/
    
    return $(el).css(attribute);
    
  
};


_html2canvas.Util.BackgroundPosition = function ( el, bounds, image ) {
    // TODO add support for multi image backgrounds
    
    var bgposition = (function( bgp ){   
            
        if (bgp !== undefined) {
            return (bgp.split(",")[0] || "0 0").split(" ");
        } else {
            // Older IE uses -x and -y 
            return [ _html2canvas.Util.getCSS( el, "backgroundPositionX" ), _html2canvas.Util.getCSS( el, "backgroundPositionY" ) ];
        }
            
            
    })( _html2canvas.Util.getCSS( el, "backgroundPosition" ) ),
    topPos,
    left,
    percentage,
    val;
    
    if (bgposition.length === 1){
        val = bgposition;
            
        bgposition = [];
        
        bgposition[0] = val;
        bgposition[1] = val;
    }  

    

    if (bgposition[0].toString().indexOf("%") !== -1){    
        percentage = (parseFloat(bgposition[0])/100);        
        left =  ((bounds.width * percentage)-(image.width*percentage));
      
    }else{
        left = parseInt(bgposition[0],10);
    }

    if (bgposition[1].toString().indexOf("%") !== -1){  

        percentage = (parseFloat(bgposition[1])/100);     
        topPos =  ((bounds.height * percentage)-(image.height*percentage));
    }else{      
        topPos = parseInt(bgposition[1],10);      
    }

    

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

_html2canvas.Util.Extend = function (options, defaults) {
    var key;
    for (key in options) {              
        if (options.hasOwnProperty(key)) {
            defaults[key] = options[key];
        }
    }
    return defaults;           
};

_html2canvas.Util.Children = function(el) {
    // $(el).contents() !== el.childNodes, Opera / IE have issues with that
    var children;
    try {
        children = $(el).contents();
    } catch (ex) {
        h2clog("html2canvas.Util.Children failed with exception: " + ex.message);
        children = [];
    }
    return children;
};