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

'use strict';

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

  version : '5.3.0',

  settings : {
    active_class: 'active',
    callback : function () {},
    deep_linking: false,
    scroll_to_content: true,
    is_hover: false
  },

  default_tab_hashes: [],

  init : function (scope, method, options) {
    var self = this,
        S = this.S;

    this.bindings(method, options);
    this.handle_location_hash_change();

    // Store the default active tabs which will be referenced when the
    // location hash is absent, as in the case of navigating the tabs and
    // returning to the first viewing via the browser Back button.
    S('[' + this.attr_name() + '] > .active > a', this.scope).each(function () {
      self.default_tab_hashes.push(this.hash);
    });
  },

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

    S(this.scope)
      .off('.tab')
      // Click event: tab title
      .on('click.fndtn.tab', '[' + this.attr_name() + '] > * > a', function (e) {
        var settings = S(this).closest('[' + self.attr_name() +']').data(self.attr_name(true) + '-init');
        if (!settings.is_hover || Modernizr.touch) {
          e.preventDefault();
          e.stopPropagation();
          self.toggle_active_tab(S(this).parent());
        }
      })
      // Hover event: tab title
      .on('mouseenter.fndtn.tab', '[' + this.attr_name() + '] > * > a', function (e) {
        var settings = S(this).closest('[' + self.attr_name() +']').data(self.attr_name(true) + '-init');
        if (settings.is_hover) self.toggle_active_tab(S(this).parent());
      });

    // Location hash change event
    S(window).on('hashchange.fndtn.tab', function (e) {
      e.preventDefault();
      self.handle_location_hash_change();
    });
  },

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

    S('[' + this.attr_name() + ']', this.scope).each(function () {
      var settings = S(this).data(self.attr_name(true) + '-init');
      if (settings.deep_linking) {
        // Match the location hash to a label
        var hash = self.scope.location.hash;
        if (hash != '') {
          // Check whether the location hash references a tab content div or
          // another element on the page (inside or outside the tab content div)
          var hash_element = S(hash);
          if (hash_element.hasClass('content') && hash_element.parent().hasClass('tab-content')) {
            // Tab content div
            self.toggle_active_tab($('[' + self.attr_name() + '] > * > a[href=' + hash + ']').parent());
          } else {
            // Not the tab content div. If inside the tab content, find the
            // containing tab and toggle it as active.
            var hash_tab_container_id = hash_element.closest('.content').attr('id');
            if (hash_tab_container_id != undefined) {
              self.toggle_active_tab($('[' + self.attr_name() + '] > * > a[href=#' + hash_tab_container_id + ']').parent(), hash);
            }
          }
        } else {
          // Reference the default tab hashes which were initialized in the init function
          for (var ind in self.default_tab_hashes) {
            self.toggle_active_tab($('[' + self.attr_name() + '] > * > a[href=' + self.default_tab_hashes[ind] + ']').parent());
          }
        }
      }
     });
   },

  toggle_active_tab: function (tab, location_hash) {
    var S = this.S,
        tabs = tab.closest('[' + this.attr_name() + ']'),
        anchor = tab.children('a').first(),
        target_hash = '#' + anchor.attr('href').split('#')[1],
        target = S(target_hash),
        siblings = tab.siblings(),
        settings = tabs.data(this.attr_name(true) + '-init');

    // allow usage of data-tab-content attribute instead of href
    if (S(this).data(this.data_attr('tab-content'))) {
      target_hash = '#' + S(this).data(this.data_attr('tab-content')).split('#')[1];
      target = S(target_hash);
    }

    if (settings.deep_linking) {
      // Get the scroll Y position prior to moving to the hash ID
      var cur_ypos = $('body,html').scrollTop();

      // Update the location hash to preserve browser history
      // Note that the hash does not need to correspond to the
      // tab content ID anchor; it can be an ID inside or outside of the tab
      // content div.
      if (location_hash != undefined) {
        window.location.hash = location_hash;
      } else {
        window.location.hash = target_hash;
      }

      if (settings.scroll_to_content) {
        // If the user is requesting the content of a tab, then scroll to the
        // top of the title area; otherwise, scroll to the element within
        // the content area as defined by the hash value.
        if (location_hash == undefined || location_hash == target_hash) {
          tab.parent()[0].scrollIntoView();
        } else {
          S(target_hash)[0].scrollIntoView();
        }
      } else {
        // Adjust the scrollbar to the Y position prior to setting the hash
        // Only do this for the tab content anchor, otherwise there will be
        // conflicts with in-tab anchor links nested in the tab-content div
        if (location_hash == undefined || location_hash == target_hash) {
          $('body,html').scrollTop(cur_ypos);
        }
      }
    }

    // WARNING: The activation and deactivation of the tab content must
    // occur after the deep linking in order to properly refresh the browser
    // window (notably in Chrome).
    tab.addClass(settings.active_class).triggerHandler('opened');
    siblings.removeClass(settings.active_class);
    target.siblings().removeClass(settings.active_class).end().addClass(settings.active_class);
    settings.callback(tab);
    target.triggerHandler('toggled', [tab]);
    tabs.triggerHandler('toggled', [target]);
  },

  data_attr: function (str) {
    if (this.namespace.length > 0) {
      return this.namespace + '-' + str;
    }

    return str;
  },

  off : function () {},

  reflow : function () {}
};

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