/******************************************************
    * jQuery plug-in
    * Easy Background Image Resizer
    * Developed by J.P. Given (http://johnpatrickgiven.com)
    * Useage: anyone so long as credit is left alone
******************************************************/

(function($) {
	// Global Namespace
    var jqez = {};

    // Define the plugin
    $.fn.ezBgResize = function(options) {
		
		// Set global to obj passed
		jqez = options;
		
		// If img option is string convert to array.
		// This is in preparation for accepting an slideshow of images.
		if (!$.isArray(jqez.img)) {
			var tmp_img = jqez.img;
			jqez.img = [tmp_img]
		}
		
		$(window).load(function() {
			jqez.width = jqez.imgWidth;
			jqez.height = jqez.imgHeight;
			
			// Create a unique div container
			$("body").append('<div id="jq_ez_bg"></div>');

			// Add the image to it.
			$("#jq_ez_bg").html('<img src="' + jqez.img[0] + '" width="' + jqez.width + '" height="' + jqez.height + '" border="0">');

			// First position object
	        $("#jq_ez_bg").css("visibility","hidden");

			// Overflow set to hidden so scroll bars don't mess up image size.
	        $("body").css({
	            "overflow":"hidden"
	        });

			resizeImage();
		});
    };

	$(window).bind("resize", function() {
		resizeImage();
	});
	
	// Actual resize function
    function resizeImage() {
        
        //stick the footer at the bottom of the page if we're on an iPad/iPhone due to viewport/page bugs in mobile webkit
        if(navigator.platform == 'iPad' || navigator.platform == 'iPhone' || navigator.platform == 'iPod')
        {
             $("#jq_ez_bg").css({
                "position":"fixed",
                "top":"0px",
                "left":"0px",
                "z-index":"-1",
                "overflow":"hidden",
                "height":"665px",
                            "opacity" : jqez.opacity
            });
        }else {
            $("#jq_ez_bg").css({
                "position":"fixed",
                "top":"0px",
                "left":"0px",
                "z-index":"-1",
                "overflow":"hidden",
                "width":$(window).width() + "px",
                "height":$(window).height() + "px",
                            "opacity" : jqez.opacity
            });
        }
	
        
		
		// Image relative to its container
		$("#jq_ez_bg").children('img').css("position", "relative");

        // Resize the img object to the proper ratio of the window.
        var iw = $("#jq_ez_bg").children('img').width();
        var ih = $("#jq_ez_bg").children('img').height();
        
        if(navigator.platform != 'iPad' && navigator.platform != 'iPhone' && navigator.platform != 'iPod'){
            if ($(window).width() > $(window).height()) {
                //console.log(iw, ih);
                if (iw > ih) {
                    var fRatio = iw/ih;
                    $("#jq_ez_bg").children('img').css("width",$(window).width() + "px");
                    $("#jq_ez_bg").children('img').css("height",Math.round($(window).width() * (1/fRatio)));

                    var newIh = Math.round($(window).width() * (1/fRatio));

                    if(newIh < $(window).height()) {
                        var fRatio = ih/iw;
                        $("#jq_ez_bg").children('img').css("height",$(window).height());
                        $("#jq_ez_bg").children('img').css("width",Math.round($(window).height() * (1/fRatio)));
                    }
                } else {
                    var fRatio = ih/iw;
                    $("#jq_ez_bg").children('img').css("height",$(window).height());
                    $("#jq_ez_bg").children('img').css("width",Math.round($(window).height() * (1/fRatio)));
                }
            } else {
                var fRatio = ih/iw;
                $("#jq_ez_bg").children('img').css("height",$(window).height());
                $("#jq_ez_bg").children('img').css("width",Math.round($(window).height() * (1/fRatio)));
            }
            
            // Center the image
            if (typeof(jqez.center) == 'undefined' || jqez.center) {
                    if ($("#jq_ez_bg").children('img').width() > $(window).width()) {
                            var this_left = ($("#jq_ez_bg").children('img').width() - $(window).width()) / 2;
                            $("#jq_ez_bg").children('img').css({
                                    "top"  : 0,
                                    "left" : -this_left
                            });
                    }
                    if ($("#jq_ez_bg").children('img').height() > $(window).height()) {
                            var this_height = ($("#jq_ez_bg").children('img').height() - $(window).height()) / 2;
                            $("#jq_ez_bg").children('img').css({
                                    "left" : 0,
                                    "top" : -this_height
                            });
                    }
            }
        }
        
        
        

        $("#jq_ez_bg").css({
			"visibility" : "visible"
		});

		// Allow scrolling again
		$("body").css({
            "overflow":"auto"
        });
		
        
    }
})(jQuery);