/**

 * @file

 * Attaches behaviors for the Dashboard module.

 */

(function ($) {

/**

 * Implements Drupal.behaviors for the Dashboard module.

 */

Drupal.behaviors.dashboard = {

  attach: function (context, settings) {

    $('#dashboard', context).once(function () {

      $(this).prepend('<div class="customize clearfix"><ul class="action-links"><li><a href="#">' + Drupal.t('Customize dashboard') + '</a></li></ul><div class="canvas"></div></div>');

      $('.customize .action-links a', this).click(Drupal.behaviors.dashboard.enterCustomizeMode);

    });

    Drupal.behaviors.dashboard.addPlaceholders();

    if (Drupal.settings.dashboard.launchCustomize) {

      Drupal.behaviors.dashboard.enterCustomizeMode();

    }

  },

  addPlaceholders: function() {

    $('#dashboard .dashboard-region .region').each(function () {

      var empty_text = "";

      // If the region is empty

      if ($('.block', this).length == 0) {

        // Check if we are in customize mode and grab the correct empty text

        if ($('#dashboard').hasClass('customize-mode')) {

          empty_text = Drupal.settings.dashboard.emptyRegionTextActive;

        } else {

          empty_text = Drupal.settings.dashboard.emptyRegionTextInactive;

        }

        // We need a placeholder.

        if ($('.dashboard-placeholder', this).length == 0) {

          $(this).append('<div class="dashboard-placeholder"></div>');

        }

        $('.dashboard-placeholder', this).html(empty_text);

      }

      else {

        $('.dashboard-placeholder', this).remove();

      }

    });

  },

  /**

   * Enters "customize" mode by displaying disabled blocks.

   */

  enterCustomizeMode: function () {

    $('#dashboard').addClass('customize-mode customize-inactive');

    Drupal.behaviors.dashboard.addPlaceholders();

    // Hide the customize link

    $('#dashboard .customize .action-links').hide();

    // Load up the disabled blocks

    $('div.customize .canvas').load(Drupal.settings.dashboard.drawer, Drupal.behaviors.dashboard.setupDrawer);

  },

  /**

   * Exits "customize" mode by simply forcing a page refresh.

   */

  exitCustomizeMode: function () {

    $('#dashboard').removeClass('customize-mode customize-inactive');

    Drupal.behaviors.dashboard.addPlaceholders();

    location.href = Drupal.settings.dashboard.dashboard;

  },

  /**

   * Sets up the drag-and-drop behavior and the 'close' button.

   */

  setupDrawer: function () {

    $('div.customize .canvas-content input').click(Drupal.behaviors.dashboard.exitCustomizeMode);

    $('div.customize .canvas-content').append('<a class="button" href="' + Drupal.settings.dashboard.dashboard + '">' + Drupal.t('Done') + '</a>');

    // Initialize drag-and-drop.

    var regions = $('#dashboard div.region');

    regions.sortable({

      connectWith: regions,

      cursor: 'move',

      cursorAt: {top:0},

      dropOnEmpty: true,

      items: '> div.block, > div.disabled-block',

      placeholder: 'block-placeholder clearfix',

      tolerance: 'pointer',

      start: Drupal.behaviors.dashboard.start,

      over: Drupal.behaviors.dashboard.over,

      sort: Drupal.behaviors.dashboard.sort,

      update: Drupal.behaviors.dashboard.update

    });

  },

  /**

   * Makes the block appear as a disabled block while dragging.

   *

   * This function is called on the jQuery UI Sortable "start" event.

   *

   * @param event

   *  The event that triggered this callback.

   * @param ui

   *  An object containing information about the item that is being dragged.

   */

  start: function (event, ui) {

    $('#dashboard').removeClass('customize-inactive');

    var item = $(ui.item);

    // If the block is already in disabled state, don't do anything.

    if (!item.hasClass('disabled-block')) {

      item.css({height: 'auto'});

    }

  },

  /**

   * Adapts block's width to the region it is moved into while dragging.

   *

   * This function is called on the jQuery UI Sortable "over" event.

   *

   * @param event

   *  The event that triggered this callback.

   * @param ui

   *  An object containing information about the item that is being dragged.

   */

  over: function (event, ui) {

    var item = $(ui.item);

    // If the block is in disabled state, remove width.

    if ($(this).closest('#disabled-blocks').length) {

      item.css('width', '');

    }

    else {

      item.css('width', $(this).width());

    }

  },

  /**

   * Adapts a block's position to stay connected with the mouse pointer.

   *

   * This function is called on the jQuery UI Sortable "sort" event.

   *

   * @param event

   *  The event that triggered this callback.

   * @param ui

   *  An object containing information about the item that is being dragged.

   */

  sort: function (event, ui) {

    var item = $(ui.item);

    if (event.pageX > ui.offset.left + item.width()) {

      item.css('left', event.pageX);

    }

  },

  /**

   * Sends block order to the server, and expand previously disabled blocks.

   *

   * This function is called on the jQuery UI Sortable "update" event.

   *

   * @param event

   *   The event that triggered this callback.

   * @param ui

   *   An object containing information about the item that was just dropped.

   */

  update: function (event, ui) {

    $('#dashboard').addClass('customize-inactive');

    var item = $(ui.item);

    // If the user dragged a disabled block, load the block contents.

    if (item.hasClass('disabled-block')) {

      var module, delta, itemClass;

      itemClass = item.attr('class');

      // Determine the block module and delta.

      module = itemClass.match(/\bmodule-(\S+)\b/)[1];

      delta = itemClass.match(/\bdelta-(\S+)\b/)[1];

      // Load the newly enabled block's content.

      $.get(Drupal.settings.dashboard.blockContent + '/' + module + '/' + delta, {},

        function (block) {

          if (block) {

            item.html(block);

          }

          if (item.find('div.content').is(':empty')) {

            item.find('div.content').html(Drupal.settings.dashboard.emptyBlockText);

          }

          Drupal.attachBehaviors(item);

        },

        'html'

      );

      // Remove the "disabled-block" class, so we don't reload its content the

      // next time it's dragged.

      item.removeClass("disabled-block");

    }

    Drupal.behaviors.dashboard.addPlaceholders();

    // Let the server know what the new block order is.

    $.post(Drupal.settings.dashboard.updatePath, {

        'form_token': Drupal.settings.dashboard.formToken,

        'regions': Drupal.behaviors.dashboard.getOrder

      }

    );

  },

  /**

   * Returns the current order of the blocks in each of the sortable regions.

   *

   * @return

   *   The current order of the blocks, in query string format.

   */

  getOrder: function () {

    var order = [];

    $('#dashboard div.region').each(function () {

      var region = $(this).parent().attr('id').replace(/-/g, '_');

      var blocks = $(this).sortable('toArray');

      $.each(blocks, function() {

        order.push(region + '[]=' + this);

      });

    });

    order = order.join('&');

    return order;

  }

};

})(jQuery);