/**
* jquery.scrollable 0.13. Put your HTML scroll.
* 
* http://flowplayer.org/tools/scrollable.html
*
* Copyright (c) 2008 Tero Piirainen (support@flowplayer.org)
*
* Released under the MIT License:
* http://www.opensource.org/licenses/mit-license.php
* 
* >> Basically you can do anything you want but leave this header as is <<
*
* Since  : 0.10 - 03/01/2008
* Version: 0.13 - Wed Nov 05 2008 12:04:04 GMT-0000 (GMT+00:00)
*/
(function($) {

    // constructor
    function Scrollable(el, config) {

        // current instance
        var self = this;

        if (!Scrollable.current) {
            Scrollable.current = this;
        }

        var opts = {
            size: 5,
            vertical: false,
            activeClass: 'active',
            speed: 300,
            onSeek: null,
            clickable: true,

            // jquery selectors
            items: '.items',
            prev: '.prev',
            next: '.next',
            navi: '.navi',
            naviItem: 'span',
            loop: false
        };


        this.opts = $.extend(opts, config);
        this.opts.horizontal = !opts.vertical;

        // root / itemRoot
        this.root = $(el);
        var root = this.root;
        var itemRoot = $(opts.items, root);
        if (!itemRoot.length) { itemRoot = root; }


        // wrap itemRoot.children() inside container
        itemRoot.css({ position: 'relative', overflow: 'hidden', visibility: 'visible' });
        //itemRoot.children().wrapAll('<div class="__scrollable" style="position:absolute"/>');

        this.wrap = itemRoot.find(":first");
        this.wrap.css(opts.horizontal ? "width" : "height", "200000em").after('<br clear="all" />');
        this.items = this.wrap.children();
        this.index = 0;

        /*		
        // set dimensions based on offsets of the two first elements
        if (opts.horizontal) {
        itemRoot.width(opts.size * (this.items.eq(1).offset().left - this.items.eq(0).offset().left) -2);	
        } else {
        itemRoot.height(opts.size * (this.items.eq(1).offset().top - this.items.eq(0).offset().top) -2);	
        } 
        */
        // mousewheel
        if ($.isFunction($.fn.mousewheel)) {
            root.bind("mousewheel.scrollable", function(e, delta) {
                self.move(-delta, 50);
                return false;
            });
        }

        // item.click()
        if (opts.clickable) {
            this.items.each(function(index, arg) {
                $(this).bind("click.scrollable", function() {
                    self.click(index);
                });
            });
        }


        this.activeIndex = 0;

        // prev
        $(opts.prev, root).click(function() {
            self.prev();
        });


        // next
        $(opts.next, root).click(function() {
            self.next();
        });

    }


    // methods
    $.extend(Scrollable.prototype, {


        getVersion: function() {
            return '@VERSION';
        },

        click: function(index) {

            var item = this.items.eq(index);
            var klass = this.opts.activeClass;

            if (!item.hasClass(klass) && (index >= 0 || index < this.items.size())) {
                this.items.removeClass(klass);
                item.addClass(klass);
                var delta = Math.floor(this.opts.size / 2);
                var to = index - delta;

                if (to !== this.activeIndex) {
                    this.seekTo(to);
                }
            }
        },

        refresh: function() {
            this.items = this.wrap.children();
        },
        getStatus: function() {
            var len = this.items.size();
            return {
                size: this.opts.size,
                total: len,
                index: this.index,
                pages: Math.ceil(len / this.opts.size),
                page: Math.ceil(this.index / this.opts.size)
            };
        },


        // all other seeking functions depend on this generic seeking function
        seekTo: function(index, time) {

            if (index < 0) { index = 0; }
            var item = this.items.eq(index);
            var itemWidth = item.width();
            var left = item.position().left;
            var right = left + itemWidth;

            var pos1 = this.wrap.position().left;
            var pos2 = item.parent().parent().width();

            if (left + pos1 < 0)
                this.wrap.animate({ left: -left }, time || this.opts.speed);
            if (right + pos1 > pos2)
                this.wrap.animate({ left: pos2 - right }, time || this.opts.speed);

            // custom onSeek callback
            if ($.isFunction(this.opts.onSeek)) {
                this.opts.onSeek.call(this);
            }


            this.activeIndex = index;
            return true;
        },
        seekTo1: function(index, time) {

            if (index < 0) { index = 0; }
            var max = Math.min(index, this.items.length - this.opts.size);

            if (index <= max) {

                var item = this.items.eq(index);
                this.index = index;

                if (this.opts.horizontal) {
                    var left = this.wrap.offset().left - item.offset().left;
                    this.wrap.animate({ left: left }, time || this.opts.speed);

                } else {
                    var top = this.wrap.offset().top - item.offset().top;
                    this.wrap.animate({ top: top }, time || this.opts.speed);
                }

                Scrollable.current = this;
            }


            // custom onSeek callback
            if ($.isFunction(this.opts.onSeek)) {
                this.opts.onSeek.call(this);
            }


            this.activeIndex = index;
            return true;
        },


        move: function(offset, time) {
            var item = this.items.eq(0);
            var itemWidth = item.outerWidth(true);
            var pos1 = this.wrap.position().left;
            pos1 -= offset * itemWidth;
            if (pos1 > 0)
                pos1 = 0;
            if (pos1 < -(this.items.length - this.opts.size) * itemWidth)
                pos1 = -(this.items.length - this.opts.size) * itemWidth;
            this.wrap.animate({ left: pos1 }, time || this.opts.speed);
        },

        next: function(time) {
            this.move(1, time);
        },

        prev: function(time) {
            this.move(-1, time);
        },

        movePage: function(offset, time) {
            this.move(this.opts.size * offset, time);
        },

        setPage: function(page, time) {
            var size = this.opts.size;
            var index = size * page;
            var lastPage = index + size >= this.items.size();
            if (lastPage) {
                index = this.items.size() - this.opts.size;
            }
            this.seekTo(index, time);
        },

        prevPage: function(time) {
            this.setPage(this.getStatus().page - 1, time);
        },

        nextPage: function(time) {
            this.setPage(this.getStatus().page + 1, time);
        },

        begin: function(time) {
            this.seekTo(0, time);
        },

        end: function(time) {
            this.seekTo(this.items.size() - this.opts.size, time);
        }

    });



    // jQuery plugin implementation
    jQuery.prototype.scrollable = function(opts, arg0, arg1) {

        // return API associated with this instance
        if (!opts || typeof opts == 'number') {
            var index = opts || 0;
            var el = $.data(this.get()[index], "scrollable");
            if (el) { return el; }
        }

        this.each(function() {

            // @deprecated way of accessing API
            if (typeof opts == "string") {
                var el = $.data(this, "scrollable");
                el[opts].apply(el, [arg0, arg1]);

                // create new Scrollable instance
            } else {
                var instance = new Scrollable(this, opts);
                $.data(this, "scrollable", instance);
            }
        });

        return this;
    };


})(jQuery);