/*
* Author:      Marco Kuiper (http://www.marcofolio.net/)
*/

// Speed of the automatic slideshow
var slideshowSpeed = 6000;

// Variable to store the images we need to set as background
// which also includes some text and url's.
var photos = [ {
                "title" : "Stairs",
                "image" : "back_main.jpg",
                "url" : "http://www.sxc.hu/photo/1271909",
                "firstline" : "Going on",
                "secondline" : "vacation?"
        }, {
                "title" : "Office Appartments",
                "image" : "back_main2.jpg",
                "url" : "http://www.sxc.hu/photo/1265695",
                "firstline" : "Or still busy at",
                "secondline" : "work?"
        }, {
                "title" : "Office Appartments",
                "image" : "back_main3.jpg",
                "url" : "http://www.sxc.hu/photo/1265695",
                "firstline" : "Or still busy at",
                "secondline" : "work?"
        }, {
                "title" : "Office Appartments",
                "image" : "back_main4.jpg",
                "url" : "http://www.sxc.hu/photo/1265695",
                "firstline" : "Or still busy at",
                "secondline" : "work?"
        }, {
                "title" : "Office Appartments",
                "image" : "back_main5.jpg",
                "url" : "http://www.sxc.hu/photo/1265695",
                "firstline" : "Or still busy at",
                "secondline" : "work?"
        }
];



$(document).ready(function() {

        // Backwards navigation
        $("#back").click(function() {
                stopAnimation();
                navigate("back");
        });

        // Forward navigation
        $("#next").click(function() {
                stopAnimation();
                navigate("next");
        });

        var interval;
        $("#control").toggle(function(){
                stopAnimation();
        }, function() {
                // Change the background image to "pause"
                $(this).css({ "background-image" : "url(images/btn_pause.png)" });

                // Show the next image
                navigate("next");

                // Start playing the animation
                interval = setInterval(function() {
                        navigate("next");
                }, slideshowSpeed);
        });


        var activeContainer = 1;
        var currentImg = 0;
        var animating = false;
        var navigate = function(direction) {
                // Check if no animation is running. If it is, prevent the action
                if(animating) {
                        return;
                }

                // Check which current image we need to show
                if(direction == "next") {
                        currentImg++;
                        if(currentImg == photos.length + 1) {
                                currentImg = 1;
                        }
                } else {
                        currentImg--;
                        if(currentImg == 0) {
                                currentImg = photos.length;
                        }
                }

                // Check which container we need to use
                var currentContainer = activeContainer;
                if(activeContainer == 1) {
                        activeContainer = 2;
                } else {
                        activeContainer = 1;
                }

                showImage(photos[currentImg - 1], currentContainer, activeContainer);

        };

        var currentZindex = -1;
        var showImage = function(photoObject, currentContainer, activeContainer) {
                animating = true;

                // Make sure the new container is always on the background
                currentZindex--;

                // Set the background image of the new active container
                $("#headerimg" + activeContainer).css({
                        "background-image" : "url(http://www.designscopecompany.com/bg_slides/" + photoObject.image + ")",
                        "display" : "block",
                        "z-index" : currentZindex
                });

                // Hide the header text
                $("#headertxt").css({"display" : "none"});

                // Set the new header text
                $("#firstline").html(photoObject.firstline);
                $("#secondline")
                        .attr("href", photoObject.url)
                        .html(photoObject.secondline);
                $("#pictureduri")
                        .attr("href", photoObject.url)
                        .html(photoObject.title);


                // Fade out the current container
                // and display the header text when animation is complete
                $("#headerimg" + currentContainer).fadeOut(function() {
                        setTimeout(function() {
                                $("#headertxt").css({"display" : "block"});
                                animating = false;
                        }, 500);
                });
        };

        var stopAnimation = function() {
                // Change the background image to "play"
                $("#control").css({ "background-image" : "url(images/btn_play.png)" });

                // Clear the interval
                clearInterval(interval);
        };

        // We should statically set the first image
        navigate("next");

        // Start playing the animation
        interval = setInterval(function() {
                navigate("next");
        }, slideshowSpeed);

});