/*!
 * waterwheel carousel
 * version 2.3.0
 * http://www.bkosborne.com
 *
 * copyright 2011-2013 brian osborne
 * dual licensed under gplv3 or mit
 * copies of the licenses have been distributed
 * with this plugin.
 *
 * plugin written by brian osborne
 * for use with the jquery javascript framework
 * http://www.jquery.com
 */
;
(function ($) {
    'use strict';
    $.fn.waterwheelcarousel = function (startingoptions) {
        if (this.length > 1) {
            this.each(function () {
                $(this).waterwheelcarousel(startingoptions);
            });
            return this;
        }
        var carousel = this;
        var options = {};
        var data = {};

        function initializecarouseldata() {
            data = {
                itemscontainer: $(carousel),
                totalitems: $(carousel).find('img').length,
                containerwidth: $(carousel).width(),
                containerheight: $(carousel).height(),
                currentcenteritem: null,
                previouscenteritem: null,
                items: [],
                calculations: [],
                carouselrotationsleft: 10,
                currentlymoving: false,
                itemsanimating: 0,
                currentspeed: options.speed,
                intervaltimer: null,
                currentdirection: 'forward',
                leftitemscount: 0,
                rightitemscount: 0,
                performingsetup: true
            };
            data.itemscontainer.find('img').removeclass(options.activeclassname);
        }

        function autoplay(stop) {
            cleartimeout(data.autoplaytimer);
            if (!stop && options.autoplay !== 0) {
                data.autoplaytimer = settimeout(function () {
                    if (options.autoplay > 0) {
                        moveonce('forward');
                    } else {
                        moveonce('backward');
                    }
                }, math.abs(options.autoplay));
            }
        }

        function preload(callback) {
            if (options.preloadimages === false) {
                callback();
                return;
            }
            var $imageelements = data.itemscontainer.find('img'),
                loadedimages = 0,
                totalimages = $imageelements.length;
            $imageelements.each(function () {
                $(this).bind('load', function () {
                    loadedimages += 1;
                    if (loadedimages === totalimages) {
                        callback();
                        return;
                    }
                });
                $(this).attr('src', $(this).attr('src'));
                if (this.complete) {
                    $(this).trigger('load');
                }
            });
        }

        function setoriginalitemdimensions() {
            data.itemscontainer.find('img').each(function () {
                if ($(this).data('original_width') == undefined || options.forcedimagewidth > 0) {
                    $(this).data('original_width', $(this).width());
                }
                if ($(this).data('original_height') == undefined || options.forcedimageheight > 0) {
                    $(this).data('original_height', $(this).height());
                }
            });
        }

        function forceimagedimensionsifenabled() {
            if (options.forcedimagewidth && options.forcedimageheight) {
                data.itemscontainer.find('img').each(function () {
                    $(this).width(options.forcedimagewidth);
                    $(this).height(options.forcedimageheight);
                });
            }
        }

        function precalculatepositionproperties() {
            var $firstitem = data.itemscontainer.find('img:first');
            data.calculations[0] = {
                distance: 0,
                offset: 0,
                opacity: 1
            }
            var horizonoffset = options.horizonoffset;
            var separation = options.separation;
            for (var i = 1; i <= options.flankingitems + 2; i++) {
                if (i > 1) {
                    horizonoffset *= options.horizonoffsetmultiplier;
                    separation *= options.separationmultiplier;
                }
                data.calculations[i] = {
                    distance: data.calculations[i - 1].distance + separation,
                    offset: data.calculations[i - 1].offset + horizonoffset,
                    opacity: data.calculations[i - 1].opacity * options.opacitymultiplier
                }
            }
            if (options.edgefadeenabled) {
                data.calculations[options.flankingitems + 1].opacity = 0;
            } else {
                data.calculations[options.flankingitems + 1] = {
                    distance: 0,
                    offset: 0,
                    opacity: 0
                }
            }
        }

        function setupcarousel() {
            data.items = data.itemscontainer.find('img');
            for (var i = 0; i < data.totalitems; i++) {
                data.items[i] = $(data.items[i]);
            }
            if (options.horizon === 0) {
                if (options.orientation === 'horizontal') {
                    options.horizon = data.containerheight / 2;
                } else {
                    options.horizon = data.containerwidth / 2;
                }
            }
            data.itemscontainer.css('position', 'relative').find('img').each(function () {
                var centerposleft, centerpostop;
                if (options.orientation === 'horizontal') {
                    centerposleft = (data.containerwidth / 2) - ($(this).data('original_width') / 2);
                    centerpostop = options.horizon - ($(this).data('original_height') / 2);
                } else {
                    centerposleft = options.horizon - ($(this).data('original_width') / 2);
                    centerpostop = (data.containerheight / 2) - ($(this).data('original_height') / 2);
                }
                $(this).css({
                    'left': centerposleft,
                    'top': centerpostop,
                    'visibility': 'visible',
                    'position': 'absolute',
                    'z-index': 0,
                    'opacity': 0
                }).data({
                    top: centerpostop,
                    left: centerposleft,
                    oldposition: 0,
                    currentposition: 0,
                    depth: 0,
                    opacity: 0
                }).show();
            });
        }

        function setupstarterrotation() {
            options.startingitem = (options.startingitem === 0) ? math.round(data.totalitems / 2) : options.startingitem;
            data.rightitemscount = math.ceil((data.totalitems - 1) / 2);
            data.leftitemscount = math.floor((data.totalitems - 1) / 2);
            data.carouselrotationsleft = 1;
            moveitem(data.items[options.startingitem - 1], 0);
            data.items[options.startingitem - 1].css('opacity', 1);
            var itemindex = options.startingitem - 1;
            for (var pos = 1; pos <= data.rightitemscount; pos++) {
                (itemindex < data.totalitems - 1) ? itemindex += 1: itemindex = 0;
                data.items[itemindex].css('opacity', 1);
                moveitem(data.items[itemindex], pos);
            }
            var itemindex = options.startingitem - 1;
            for (var pos = -1; pos >= data.leftitemscount * -1; pos--) {
                (itemindex > 0) ? itemindex -= 1: itemindex = data.totalitems - 1;
                data.items[itemindex].css('opacity', 1);
                moveitem(data.items[itemindex], pos);
            }
        }

        function performcalculations($item, newposition) {
            var newdistancefromcenter = math.abs(newposition);
            if (newdistancefromcenter < options.flankingitems + 1) {
                var calculations = data.calculations[newdistancefromcenter];
            } else {
                var calculations = data.calculations[options.flankingitems + 1];
            }
            var distancefactor = math.pow(options.sizemultiplier, newdistancefromcenter)
            var newwidth = distancefactor * $item.data('original_width');
            var newheight = distancefactor * $item.data('original_height');
            var widthdifference = math.abs($item.width() - newwidth);
            var heightdifference = math.abs($item.height() - newheight);
            var newoffset = calculations.offset
            var newdistance = calculations.distance;
            if (newposition < 0) {
                newdistance *= -1;
            }
            if (options.orientation == 'horizontal') {
                var center = data.containerwidth / 2;
                var newleft = center + newdistance - (newwidth / 2);
                var newtop = options.horizon - newoffset - (newheight / 2);
            } else {
                var center = data.containerheight / 2;
                var newleft = options.horizon - newoffset - (newwidth / 2);
                var newtop = center + newdistance - (newheight / 2);
            }
            var newopacity;
            if (newposition === 0) {
                newopacity = 1;
            } else {
                newopacity = calculations.opacity;
            }
            var newdepth = options.flankingitems + 2 - newdistancefromcenter;
            $item.data('width', newwidth);
            $item.data('height', newheight);
            $item.data('top', newtop);
            $item.data('left', newleft);
            $item.data('oldposition', $item.data('currentposition'));
            $item.data('depth', newdepth);
            $item.data('opacity', newopacity);
        }

        function moveitem($item, newposition) {
            if (math.abs(newposition) <= options.flankingitems + 1) {
                performcalculations($item, newposition);
                data.itemsanimating++;
                $item.css('z-index', $item.data().depth).animate({
                    left: $item.data().left,
                    width: $item.data().width,
                    height: $item.data().height,
                    top: $item.data().top,
                    opacity: $item.data().opacity
                }, data.currentspeed, options.animationeasing, function () {
                    itemanimationcomplete($item, newposition);
                });
            } else {
                $item.data('currentposition', newposition)
                if ($item.data('oldposition') === 0) {
                    $item.css({
                        'left': $item.data().left,
                        'width': $item.data().width,
                        'height': $item.data().height,
                        'top': $item.data().top,
                        'opacity': $item.data().opacity,
                        'z-index': $item.data().depth
                    });
                }
            }
        }

        function itemanimationcomplete($item, newposition) {
            data.itemsanimating--;
            $item.data('currentposition', newposition);
            if (newposition === 0) {
                data.currentcenteritem = $item;
            }
            if (data.itemsanimating === 0) {
                data.carouselrotationsleft -= 1;
                data.currentlymoving = false;
                if (data.carouselrotationsleft > 0) {
                    rotatecarousel(0);
                } else {
                    data.currentspeed = options.speed;
                    data.currentcenteritem.addclass(options.activeclassname);
                    if (data.performingsetup === false) {
                        options.movedtocenter(data.currentcenteritem);
                        options.movedfromcenter(data.previouscenteritem);
                    }
                    data.performingsetup = false;
                    autoplay();
                }
            }
        }

        function rotatecarousel(rotations) {
            if (data.currentlymoving === false) {
                data.currentcenteritem.removeclass(options.activeclassname);
                data.currentlymoving = true;
                data.itemsanimating = 0;
                data.carouselrotationsleft += rotations;
                if (options.quickerforfurther === true) {
                    if (rotations > 1) {
                        data.currentspeed = options.speed / rotations;
                    }
                    data.currentspeed = (data.currentspeed < 100) ? 100 : data.currentspeed;
                }
                for (var i = 0; i < data.totalitems; i++) {
                    var $item = $(data.items[i]);
                    var currentposition = $item.data('currentposition');
                    var newposition;
                    if (data.currentdirection == 'forward') {
                        newposition = currentposition - 1;
                    } else {
                        newposition = currentposition + 1;
                    }
                    var flankingallowance = (newposition > 0) ? data.rightitemscount : data.leftitemscount;
                    if (math.abs(newposition) > flankingallowance) {
                        newposition = currentposition * -1;
                        if (data.totalitems % 2 == 0) {
                            newposition += 1;
                        }
                    }
                    moveitem($item, newposition);
                }
            }
        }
        $(this).find('img').bind("click", function () {
            var itemposition = $(this).data().currentposition;
            if (options.imagenav == false) {
                return;
            }
            if (math.abs(itemposition) >= options.flankingitems + 1) {
                return;
            }
            if (data.currentlymoving) {
                return;
            }
            data.previouscenteritem = data.currentcenteritem;
            autoplay(true);
            options.autoplay = 0;
            var rotations = math.abs(itemposition);
            if (itemposition == 0) {
                options.clickedcenter($(this));
            } else {
                options.movingfromcenter(data.currentcenteritem);
                options.movingtocenter($(this));
                if (itemposition < 0) {
                    data.currentdirection = 'backward';
                    rotatecarousel(rotations);
                } else if (itemposition > 0) {
                    data.currentdirection = 'forward';
                    rotatecarousel(rotations);
                }
            }
        });
        $(this).find('a').bind("click", function (event) {
            var iscenter = $(this).find('img').data('currentposition') == 0;
            if (options.linkhandling === 1 || (options.linkhandling === 2 && !iscenter)) {
                event.preventdefault();
                return false;
            }
        });

        function nextitemfromcenter() {
            var $next = data.currentcenteritem.next();
            if ($next.length <= 0) {
                $next = data.currentcenteritem.parent().children().first();
            }
            return $next;
        }

        function previtemfromcenter() {
            var $prev = data.currentcenteritem.prev();
            if ($prev.length <= 0) {
                $prev = data.currentcenteritem.parent().children().last();
            }
            return $prev;
        }

        function moveonce(direction) {
            if (data.currentlymoving === false) {
                data.previouscenteritem = data.currentcenteritem;
                options.movingfromcenter(data.currentcenteritem);
                if (direction == 'backward') {
                    options.movingtocenter(previtemfromcenter());
                    data.currentdirection = 'backward';
                } else if (direction == 'forward') {
                    options.movingtocenter(nextitemfromcenter());
                    data.currentdirection = 'forward';
                }
            }
            rotatecarousel(1);
        }
        $(document).keydown(function (e) {
            if (options.keyboardnav) {
                if ((e.which === 37 && options.orientation == 'horizontal') || (e.which === 38 && options.orientation == 'vertical')) {
                    autoplay(true);
                    options.autoplay = 0;
                    moveonce('backward');
                } else if ((e.which === 39 && options.orientation == 'horizontal') || (e.which === 40 && options.orientation == 'vertical')) {
                    autoplay(true);
                    options.autoplay = 0;
                    moveonce('forward');
                }
                if (options.keyboardnavoverride && ((options.orientation == 'horizontal' && (e.which === 37 || e.which === 39)) || (options.orientation == 'vertical' && (e.which === 38 || e.which === 40)))) {
                    e.preventdefault();
                    return false;
                }
            }
        });
        this.reload = function (newoptions) {
            if (typeof newoptions === "object") {
                var combinedefaultwith = newoptions;
            } else {
                var combinedefaultwith = {};
            }
            options = $.extend({}, $.fn.waterwheelcarousel.defaults, newoptions);
            initializecarouseldata();
            data.itemscontainer.find('img').hide();
            forceimagedimensionsifenabled();
            preload(function () {
                setoriginalitemdimensions();
                precalculatepositionproperties();
                setupcarousel();
                setupstarterrotation();
            });
        }
        this.next = function () {
            autoplay(true);
            options.autoplay = 0;
            moveonce('forward');
        }
        this.prev = function () {
            autoplay(true);
            options.autoplay = 0;
            moveonce('backward');
        }
        this.reload(startingoptions);
        return this;
    };
    $.fn.waterwheelcarousel.defaults = {
        startingitem: 1,
        separation: 175,
        separationmultiplier: 0.6,
        horizonoffset: 0,
        horizonoffsetmultiplier: 1,
        sizemultiplier: 0.7,
        opacitymultiplier: 0.8,
        horizon: 0,
        flankingitems: 3,
        speed: 300,
        animationeasing: 'linear',
        quickerforfurther: true,
        edgefadeenabled: false,
        linkhandling: 2,
        autoplay: 0,
        orientation: 'horizontal',
        activeclassname: 'carousel-center',
        keyboardnav: false,
        keyboardnavoverride: true,
        imagenav: true,
        preloadimages: true,
        forcedimagewidth: 0,
        forcedimageheight: 0,
        movingtocenter: $.noop,
        movedtocenter: $.noop,
        clickedcenter: $.noop,
        movingfromcenter: $.noop,
        movedfromcenter: $.noop
    };
})(jquery);