; (function ($, window, document, undefined) {

'use strict';

Foundation.libs.clearing = {
    name: 'clearing',

    version: '5.5.0',

    settings: {
        templates: {
            viewing: '<a href="#" class="clearing-close">&times;</a>' +
            '<div class="visible-img" style="display: none"><div class="clearing-touch-label"></div><img src="data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs%3D" alt="" />' +
            '<p class="clearing-caption"></p><a href="#" class="clearing-main-prev"><span></span></a>' +
            '<a href="#" class="clearing-main-next"><span></span></a></div>'
        },

        // comma delimited list of selectors that, on click, will close clearing,
        // add 'div.clearing-blackout, div.visible-img' to close on background click
        close_selectors: '.clearing-close, div.clearing-blackout',

        // Default to the entire li element.
        open_selectors: '',

        // Image will be skipped in carousel.
        skip_selector: '',

        touch_label: '',

        // event initializers and locks
        init: false,
        locked: false
    },

    init: function (scope, method, options) {
        var self = this;
        Foundation.inherit(this, 'throttle image_loaded');

        this.bindings(method, options);

        if (self.S(this.scope).is('[' + this.attr_name() + ']')) {
            this.assemble(self.S('li', this.scope));
        } else {
            self.S('[' + this.attr_name() + ']', this.scope).each(function () {
                self.assemble(self.S('li', this));
            });
        }
    },

    events: function (scope) {
        var self = this,
            S = self.S,
            $scroll_container = $('.scroll-container');

        if ($scroll_container.length > 0) {
            this.scope = $scroll_container;
        }

        S(this.scope)
            .off('.clearing')
            .on('click.fndtn.clearing', 'ul[' + this.attr_name() + '] li ' + this.settings.open_selectors,
            function (e, current, target) {
                var current = current || S(this),
                    target = target || current,
                    next = current.next('li'),
                    settings = current.closest('[' + self.attr_name() + ']').data(self.attr_name(true) + '-init'),
                    image = S(e.target);

                e.preventDefault();

                if (!settings) {
                    self.init();
                    settings = current.closest('[' + self.attr_name() + ']').data(self.attr_name(true) + '-init');
                }

                // if clearing is open and the current image is
                // clicked, go to the next image in sequence
                if (target.hasClass('visible') &&
                    current[0] === target[0] &&
                    next.length > 0 && self.is_open(current)) {
                    target = next;
                    image = S('img', target);
                }

                // set current and target to the clicked li if not otherwise defined.
                self.open(image, current, target);
                self.update_paddles(target);
            })

            .on('click.fndtn.clearing', '.clearing-main-next',
            function (e) {
                self.nav(e, 'next')
            })
            .on('click.fndtn.clearing', '.clearing-main-prev',
            function (e) {
                self.nav(e, 'prev')
            })
            .on('click.fndtn.clearing', this.settings.close_selectors,
            function (e) {
                Foundation.libs.clearing.close(e, this)
            });

        $(document).on('keydown.fndtn.clearing',
            function (e) {
                self.keydown(e)
            });

        S(window).off('.clearing').on('resize.fndtn.clearing',
            function () {
                self.resize()
            });

        this.swipe_events(scope);
    },

    swipe_events: function (scope) {
        var self = this,
            S = self.S;

        S(this.scope)
            .on('touchstart.fndtn.clearing', '.visible-img', function (e) {
                if (!e.touches) {
                    e = e.originalEvent;
                }
                var data = {
                    start_page_x: e.touches[0].pageX,
                    start_page_y: e.touches[0].pageY,
                    start_time: (new Date()).getTime(),
                    delta_x: 0,
                    is_scrolling: undefined
                };

                S(this).data('swipe-transition', data);
                e.stopPropagation();
            })
            .on('touchmove.fndtn.clearing', '.visible-img', function (e) {
                if (!e.touches) {
                    e = e.originalEvent;
                }
                // Ignore pinch/zoom events
                if (e.touches.length > 1 || e.scale && e.scale !== 1) return;

                var data = S(this).data('swipe-transition');

                if (typeof data === 'undefined') {
                    data = {};
                }

                data.delta_x = e.touches[0].pageX - data.start_page_x;

                if (Foundation.rtl) {
                    data.delta_x = -data.delta_x;
                }

                if (typeof data.is_scrolling === 'undefined') {
                    data.is_scrolling = !!( data.is_scrolling || Math.abs(data.delta_x) < Math.abs(e.touches[0].pageY - data.start_page_y) );
                }

                if (!data.is_scrolling && !data.active) {
                    e.preventDefault();
                    var direction = (data.delta_x < 0) ? 'next' : 'prev';
                    data.active = true;
                    self.nav(e, direction);
                }
            })
            .on('touchend.fndtn.clearing', '.visible-img', function (e) {
                S(this).data('swipe-transition', {});
                e.stopPropagation();
            });
    },

    assemble: function ($li) {
        var $el = $li.parent();

        if ($el.parent().hasClass('carousel')) {
            return;
        }

        $el.after('<div id="foundationClearingHolder"></div>');

        var grid = $el.detach(),
            grid_outerHTML = '';

        if (grid[0] == null) {
            return;
        } else {
            grid_outerHTML = grid[0].outerHTML;
        }

        var holder = this.S('#foundationClearingHolder'),
            settings = $el.data(this.attr_name(true) + '-init'),
            data = {
                grid: '<div class="carousel">' + grid_outerHTML + '</div>',
                viewing: settings.templates.viewing
            },
            wrapper = '<div class="clearing-assembled"><div>' + data.viewing +
                data.grid + '</div></div>',
            touch_label = this.settings.touch_label;

        if (Modernizr.touch) {
            wrapper = $(wrapper).find('.clearing-touch-label').html(touch_label).end();
        }

        holder.after(wrapper).remove();
    },

    open: function ($image, current, target) {
        var self = this,
            body = $(document.body),
            root = target.closest('.clearing-assembled'),
            container = self.S('div', root).first(),
            visible_image = self.S('.visible-img', container),
            image = self.S('img', visible_image).not($image),
            label = self.S('.clearing-touch-label', container),
            error = false;

        // Event to disable scrolling on touch devices when Clearing is activated
        $('body').on('touchmove', function (e) {
            e.preventDefault();
        });

        image.error(function () {
            error = true;
        });

        function startLoad() {
            setTimeout(function () {
                this.image_loaded(image, function () {
                    if (image.outerWidth() === 1 && !error) {
                        startLoad.call(this);
                    } else {
                        cb.call(this, image);
                    }
                }.bind(this));
            }.bind(this), 100);
        }

        function cb(image) {
            var $image = $(image);
            $image.css('visibility', 'visible');
            // toggle the gallery
            body.css('overflow', 'hidden');
            root.addClass('clearing-blackout');
            container.addClass('clearing-container');
            visible_image.show();
            this.fix_height(target)
                .caption(self.S('.clearing-caption', visible_image), self.S('img', target))
                .center_and_label(image, label)
                .shift(current, target, function () {
                    target.closest('li').siblings().removeClass('visible');
                    target.closest('li').addClass('visible');
                });
            visible_image.trigger('opened.fndtn.clearing')
        }

        if (!this.locked()) {
            visible_image.trigger('open.fndtn.clearing');
            // set the image to the selected thumbnail
            image
                .attr('src', this.load($image))
                .css('visibility', 'hidden');

            startLoad.call(this);
        }
    },

    close: function (e, el) {
        e.preventDefault();

        var root = (function (target) {
                if (/blackout/.test(target.selector)) {
                    return target;
                } else {
                    return target.closest('.clearing-blackout');
                }
            }($(el))),
            body = $(document.body), container, visible_image;

        if (el === e.target && root) {
            body.css('overflow', '');
            container = $('div', root).first();
            visible_image = $('.visible-img', container);
            visible_image.trigger('close.fndtn.clearing');
            this.settings.prev_index = 0;
            $('ul[' + this.attr_name() + ']', root)
                .attr('style', '').closest('.clearing-blackout')
                .removeClass('clearing-blackout');
            container.removeClass('clearing-container');
            visible_image.hide();
            visible_image.trigger('closed.fndtn.clearing');
        }

        // Event to re-enable scrolling on touch devices
        $('body').off('touchmove');

        return false;
    },

    is_open: function (current) {
        return current.parent().prop('style').length > 0;
    },

    keydown: function (e) {
        var clearing = $('.clearing-blackout ul[' + this.attr_name() + ']'),
            NEXT_KEY = this.rtl ? 37 : 39,
            PREV_KEY = this.rtl ? 39 : 37,
            ESC_KEY = 27;

        if (e.which === NEXT_KEY) this.go(clearing, 'next');
        if (e.which === PREV_KEY) this.go(clearing, 'prev');
        if (e.which === ESC_KEY) this.S('a.clearing-close').trigger('click').trigger('click.fndtn.clearing');
    },

    nav: function (e, direction) {
        var clearing = $('ul[' + this.attr_name() + ']', '.clearing-blackout');

        e.preventDefault();
        this.go(clearing, direction);
    },

    resize: function () {
        var image = $('img', '.clearing-blackout .visible-img'),
            label = $('.clearing-touch-label', '.clearing-blackout');

        if (image.length) {
            this.center_and_label(image, label);
            image.trigger('resized.fndtn.clearing')
        }
    },

    // visual adjustments
    fix_height: function (target) {
        var lis = target.parent().children(),
            self = this;

        lis.each(function () {
            var li = self.S(this),
                image = li.find('img');

            if (li.height() > image.outerHeight()) {
                li.addClass('fix-height');
            }
        })
            .closest('ul')
            .width(lis.length * 100 + '%');

        return this;
    },

    update_paddles: function (target) {
        target = target.closest('li');
        var visible_image = target
            .closest('.carousel')
            .siblings('.visible-img');

        if (target.next().length > 0) {
            this.S('.clearing-main-next', visible_image).removeClass('disabled');
        } else {
            this.S('.clearing-main-next', visible_image).addClass('disabled');
        }

        if (target.prev().length > 0) {
            this.S('.clearing-main-prev', visible_image).removeClass('disabled');
        } else {
            this.S('.clearing-main-prev', visible_image).addClass('disabled');
        }
    },

    center_and_label: function (target, label) {
        if (!this.rtl) {
            target.css({
                marginLeft: -(target.outerWidth() / 2),
                marginTop: -(target.outerHeight() / 2)
            });

            if (label.length > 0) {
                label.css({
                    marginLeft: -(label.outerWidth() / 2),
                    marginTop: -(target.outerHeight() / 2) - label.outerHeight() - 10
                });
            }
        } else {
            target.css({
                marginRight: -(target.outerWidth() / 2),
                marginTop: -(target.outerHeight() / 2),
                left: 'auto',
                right: '50%'
            });

            if (label.length > 0) {
                label.css({
                    marginRight: -(label.outerWidth() / 2),
                    marginTop: -(target.outerHeight() / 2) - label.outerHeight() - 10,
                    left: 'auto',
                    right: '50%'
                });
            }
        }
        return this;
    },

    // image loading and preloading

    load: function ($image) {
        var href;

        if ($image[0].nodeName === 'A') {
            href = $image.attr('href');
        } else {
            href = $image.closest('a').attr('href');
        }

        this.preload($image);

        if (href) return href;
        return $image.attr('src');
    },

    preload: function ($image) {
        this
            .img($image.closest('li').next())
            .img($image.closest('li').prev());
    },

    img: function (img) {
        if (img.length) {
            var new_img = new Image(),
                new_a = this.S('a', img);

            if (new_a.length) {
                new_img.src = new_a.attr('href');
            } else {
                new_img.src = this.S('img', img).attr('src');
            }
        }
        return this;
    },

    // image caption

    caption: function (container, $image) {
        var caption = $image.attr('data-caption');

        if (caption) {
            container
                .html(caption)
                .show();
        } else {
            container
                .text('')
                .hide();
        }
        return this;
    },

    // directional methods

    go: function ($ul, direction) {
        var current = this.S('.visible', $ul),
            target = current[direction]();

        // Check for skip selector.
        if (this.settings.skip_selector && target.find(this.settings.skip_selector).length != 0) {
            target = target[direction]();
        }

        if (target.length) {
            this.S('img', target)
                .trigger('click', [current, target]).trigger('click.fndtn.clearing', [current, target])
                .trigger('change.fndtn.clearing');
        }
    },

    shift: function (current, target, callback) {
        var clearing = target.parent(),
            old_index = this.settings.prev_index || target.index(),
            direction = this.direction(clearing, current, target),
            dir = this.rtl ? 'right' : 'left',
            left = parseInt(clearing.css('left'), 10),
            width = target.outerWidth(),
            skip_shift;

        var dir_obj = {};

        // we use jQuery animate instead of CSS transitions because we
        // need a callback to unlock the next animation
        // needs support for RTL **
        if (target.index() !== old_index && !/skip/.test(direction)) {
            if (/left/.test(direction)) {
                this.lock();
                dir_obj[dir] = left + width;
                clearing.animate(dir_obj, 300, this.unlock());
            } else if (/right/.test(direction)) {
                this.lock();
                dir_obj[dir] = left - width;
                clearing.animate(dir_obj, 300, this.unlock());
            }
        } else if (/skip/.test(direction)) {
            // the target image is not adjacent to the current image, so
            // do we scroll right or not
            skip_shift = target.index() - this.settings.up_count;
            this.lock();

            if (skip_shift > 0) {
                dir_obj[dir] = -(skip_shift * width);
                clearing.animate(dir_obj, 300, this.unlock());
            } else {
                dir_obj[dir] = 0;
                clearing.animate(dir_obj, 300, this.unlock());
            }
        }

        callback();
    },

    direction: function ($el, current, target) {
        var lis = this.S('li', $el),
            li_width = lis.outerWidth() + (lis.outerWidth() / 4),
            up_count = Math.floor(this.S('.clearing-container').outerWidth() / li_width) - 1,
            target_index = lis.index(target),
            response;

        this.settings.up_count = up_count;

        if (this.adjacent(this.settings.prev_index, target_index)) {
            if ((target_index > up_count) && target_index > this.settings.prev_index) {
                response = 'right';
            } else if ((target_index > up_count - 1) && target_index <= this.settings.prev_index) {
                response = 'left';
            } else {
                response = false;
            }
        } else {
            response = 'skip';
        }

        this.settings.prev_index = target_index;

        return response;
    },

    adjacent: function (current_index, target_index) {
        for (var i = target_index + 1; i >= target_index - 1; i--) {
            if (i === current_index) return true;
        }
        return false;
    },

    // lock management

    lock: function () {
        this.settings.locked = true;
    },

    unlock: function () {
        this.settings.locked = false;
    },

    locked: function () {
        return this.settings.locked;
    },

    off: function () {
        this.S(this.scope).off('.fndtn.clearing');
        this.S(window).off('.fndtn.clearing');
    },

    reflow: function () {
        this.init();
    }
};

}(jQuery, window, window.document));