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

var containerObj;

(function($) {
    // plugin definition
    $.fn.resizeImage = function() {
        // First position object

        containerObj = this;
        containerObj.css("position","fixed");
        containerObj.css("visibility","hidden");
        containerObj.css("top","0px");
        containerObj.css("left","0px");
        containerObj.css("z-index","1");
        containerObj.css("overflow","hidden");

        // Set obj to the width and height of window
        containerObj.css("width",getWindowWidth() + "px");
        containerObj.css("height",getWindowHeight() + "px");
        
        
        
        // Resize the img object to the proper ratio of the window.
        var iw = containerObj.children('img').width();
        var ih = containerObj.children('img').height();
        if (getWindowWidth() > getWindowHeight()) {
            if (iw > ih) {
                var fRatio = iw/ih;
                containerObj.children('img').css("width",getWindowWidth() + "px");
                containerObj.children('img').css("height",Math.round(getWindowWidth() * (1/fRatio)));

                var newIh = Math.round(getWindowWidth() * (1/fRatio));

                if(newIh < getWindowHeight()) {
                    var fRatio = ih/iw;
                    containerObj.children('img').css("height",getWindowHeight());
                    containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
                }
            } else {
                var fRatio = ih/iw;
                containerObj.children('img').css("height",getWindowHeight());
                containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
            }
        } else {
            var fRatio = ih/iw;
            containerObj.children('img').css("height",getWindowHeight());
            containerObj.children('img').css("width",Math.round(getWindowHeight() * (1/fRatio)));
        }
        containerObj.css("visibility","visible");
    }

    // private function for debugging
    function debug($obj) {
        if (window.console && window.console.log) {
            window.console.log('Window Width: ' + $(window).width());
            window.console.log('Window Height: ' + $(window).height());
        }
    };

    // Dependable function to get Window Height
    function getWindowHeight() {
        var windowHeight = 0;
        if (typeof(window.innerHeight) == 'number') {
            windowHeight = window.innerHeight;
        }
        else {
            if (document.documentElement && document.documentElement.clientHeight) {
                windowHeight = document.documentElement.clientHeight;
            }
            else {
                if (document.body && document.body.clientHeight) {
                    windowHeight = document.body.clientHeight;
                }
            }
        }
        return windowHeight;
    };

    // Dependable function to get Window Width
    function getWindowWidth() {
        var windowWidth = 0;
        if (typeof(window.innerWidth) == 'number') {
            windowWidth = window.innerWidth;
        }
        else {
            if (document.documentElement && document.documentElement.clientWidth) {
                windowWidth = document.documentElement.clientWidth;
            }
            else {
                if (document.body && document.body.clientWidth) {
                    windowWidth = document.body.clientWidth;
                }
            }
        }
        return windowWidth;
    };
})(jQuery);