/**
* Easy Gallery for jQuery
* Create your web gallery with easy layout and easy configuration.
* @url http://www.freelancer-id.com/easy-gallery/
* @version 2.0
* CopyRight: GNU General Public License v2
* 
* Developed by: Alaa Badran
* http://www.freelancer-id.com/
* Email alaa@freelancer-id.com
*
*/
$.fn.egallery = function (options) {
    // Default settings.
    var settings = {
        animation: 'scroll',
        width: 400, // Width for gallery holder, li
        height: 400, // Height for each element
        speed: 500, // Animation speed in MS
        delay: 4000, // delay for auto play to transact.
        easing: 'swing', // Easing animation. require to include easing plugin http://gsgd.co.uk/sandbox/jquery/easing/
        thumbs: 'none', //  Thumbs: none, numbers, image OR custom
        thumbClass: '', // Thumb CSS class
        thumbImage: '', // Image url for thumbs.
        aClass: '', // Thumb active class
        auto: true // True to enable auto play
    };
    // Exteding options
    settings = $.extend(settings, options);

    // sgObj is a holder for #gallery container.. Cashing it.
    var sgObj = $(this);
    // anim used for animation.. to stop any action while animating.
    var anim = false;
    // li items count handler
    var licount = 0;
    // Auto play handler.
    var ap = null;
    // Item index for autoplay
    var aind = 0;

    /**
    * This function applies CSS for container and inside elements.
    */
    function _css() {
        $(sgObj).css({ 'overflow': 'hidden', 'width': settings.width + 'px', 'height': settings.height + 'px', 'position': 'relative' });
        $(sgObj).find("ul").css({ 'list-style': 'none', 'position': 'absolute', 'top': 0, 'left': 0, 'width': (settings.width * $(sgObj).find("li").length) + 'px', 'height': settings.height + 'px' });
        $(sgObj).find("li").css({ "float": "left", 'width': settings.width + 'px' });
    }

    /**
    * Creating numeric thumbs. Depending on elements count.
    */
    function _createThumbsNumbers() {
        var n_all = $(sgObj).find("li").length;
        if (settings.animation == "slide");
        --n_all;
        var htm = '<ul>';
        for (i = 0; i < n_all; i++) {
            htm += '<li class="' + settings.thumbClass + '">' + (i + 1) + '</' + 'li>';
        }
        htm += '</' + 'ul>';
        return htm;
    }

    function _createThumbsImage() {
        var htm = '<ul>';
        var n_all = $(sgObj).find("li").length;
        if (settings.animation == "slide");
        --n_all;
        for (i = 0; i < n_all; i++) {
            htm += '<li class="' + settings.thumbClass + '" style="background:url(\'' + settings.thumbImage + '\') center 0 no-repeat;"></' + 'li>';
        }
        htm += '</' + 'ul>';
        return htm;
    }

    /**
    * This function calls functions to generate thumbs depending on the settings.
    */
    function _thumbs(th) {
        if ($("#ssgThumbs").length < 1) {
            return false;
        }
        var animated = false;
        switch (th) {
            case "numbers":
                $("#ssgThumbs").html(_createThumbsNumbers());
                break;
            case "image":
                $("#ssgThumbs").html(_createThumbsImage());
                break;
            case "custom":
                // do nothing.
                break;
            default:
                return false;
                break;
        }
        $("#ssgThumbs li").click(function () { _cthumbs($("#ssgThumbs li").index(this), true); });
        $("#ssgThumbs li").eq(0).addClass(settings.aClass);
    }

    /**
    * This function animates the gallery to the clicked thumb OR animate the gallery for AutoPlay
    * @param ind index of clicked object
    */
    function _cthumbs(ind, c) {
        if (anim == false) {
            clearInterval(ap);
            anim = true;
            if (settings.thumbs != "none") {
                $("#ssgThumbs li").removeClass(settings.aClass); //alert(settings.aClass);
                if (ind >= licount)
                    lind = 0;
                else
                    lind = ind;
                $("#ssgThumbs li").eq(lind).addClass(settings.aClass);
                $(sgObj).find('ul').animate({ 'left': -(ind * settings.width) + 'px' }, settings.speed, settings.easing, function () {
                    anim = false;
                    if (c == true) {
                        aind = ind;
                    }
                    if (settings.auto == true) { ap = setInterval(function () { _autoplay(); }, settings.delay) }
                });
            } else {
                $(sgObj).find('ul').animate({ 'left': -(ind * settings.width) + 'px' }, settings.speed, settings.easing, function () {
                    anim = false;
                    if (settings.auto == true) { ap = setInterval(function () { _autoplay(); }, settings.delay) }
                });
            }
        }
    }

    /**
    * This function adds the first item (duplicate it) at the end WHEN using slide animation.
    * 
    */
    function _prepareGallery() {
        var first_item = $(sgObj).find("li").eq(0).html();
        licount = $(sgObj).find("li").length;
        $(sgObj).find("ul").eq(0).append("<li>" + first_item + "</li>");
    }

    /**
    * calls the thumb creator function
    */
    function _prepare() {
        _thumbs(settings.thumbs);
    }

    /**
    * Starts the auto play.
    */
    function _run() {
        // Runs autoplay
        ap = setInterval(function () {
            _autoplay();
        }, settings.delay);
    }

    /**
    * Animate the gallery on Auto play
    */
    function _autoplay() {
        aind++; //alert("Ok: "+aind);
        if (aind > licount) {
            if (settings.animation == "slide") {
                $(sgObj).find("ul").css("left", 0);
                aind = 1;
                _cthumbs(aind, false);
                return false;
            } else {
                aind = 0;
            }
        }
        _cthumbs(aind, false);
    }

    /**
    * The initializer for this plugin.
    */
    function _init() {
        if (settings.animation == "slide")
            _prepareGallery();
        _css();
        _prepare();
        if (settings.auto == true) {
            _run();
        }
    }

    return _init();

};