//Portfolio Image Rotator by Soh Tanaka
//http://www.sohtanaka.com/web-design/automatic-image-slider-w-css-jquery/

$(document).ready(function () {

    var index;
    //Set Default State of each portfolio piece
    $(".paging").show();
    $(".paging a").attr('id', 'notactive');
    $(".paging a:first").attr('id', 'active');

    //Get size of images, how many there are, then determin the size of the image reel.
    var imageWidth = $(".window").width();
    var imageSum = $(".image_reel img").size();
    var imageReelWidth = imageWidth * imageSum;

    //Adjust the image reel to its new size
    $(".image_reel").css({ 'width': imageReelWidth });
    
    function setFocusEvents() {
        if (navigator.appName == "Microsoft Internet Explorer") {
            document.onfocusout = function () { onWindowBlur(); }
            document.onfocusin = function () { onWindowFocus(); }
        } else {
            window.onblur = function () { onWindowBlur(); }
            window.onfocus = function () { onWindowFocus(); }
        }
    }

    function onWindowFocus() {
        rotateSwitch(); 
    }

    function onWindowBlur() {
        clearInterval();
    }
    
    //Paging + Slider Function
    rotate = function () {
        var triggerID = $active.attr("rel") - 1; //Get number of times to slide
        var image_reelPosition = triggerID * imageWidth; //Determines the distance the image reel needs to slide
        $(".paging a").removeAttr('id'); //Remove all active class
        $(".paging a").attr('id', 'notactive');
        $active.attr('id', 'active'); //Add active class (the $active is declared in the rotateSwitch function)
        //Slider Animation
        $(".image_reel").animate({
            left: -image_reelPosition
        }, 400);
        index = 1;
        if (index == 30) clearInterval(play);
    };

    //Rotation + Timing Event
    rotateSwitch = function () {
        play = setInterval(function () { //Set timer - this will repeat itself every 3 seconds
            $active = $('.paging a#active').next();
            if ($active.length === 0) { //If paging reaches the end...
                $active = $('.paging a:first'); //go back to first
            }
            rotate(); //Trigger the paging and slider function
        }, 7000); //Timer speed in milliseconds (3 seconds)
    };

    rotateSwitch(); //Run function on launch

    //On Hover
    $(".image_reel a").hover(function () {
        clearInterval(play); //Stop the rotation
    }, function () {
        rotateSwitch(); //Resume rotation
    });

    //On Click
    $(".paging a").click(function () {
        $active = $(this); //Activate the clicked paging
        //Reset Timer
        clearInterval(play); //Stop the rotation
        rotate(); //Trigger rotation immediately
        rotateSwitch(); // Resume rotation
        return false; //Prevent browser jump to link anchor
    });
});