/* --------------------------------------------------------------
 tablednd.js 2015-09-17 gm
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * ## Table Dnd Extension
 *
 * Sorts lines in connected tables.
 *
 * @module Admin/Extensions/tablednd
 * @ignore
 */
gx.extensions.module(
    'tablednd',

    [
        jse.source + '/vendor/jquery-ui-dist/jquery-ui.min.css',
        jse.source + '/vendor/jquery-ui-dist/jquery-ui.min.js'
    ],

    function (data) {

        'use strict';

        // ------------------------------------------------------------------------
        // VARIABLE DEFINITION
        // ------------------------------------------------------------------------

        var
            /**
             * Extension Reference
             *
             * @type {object}
             */
            $this = $(this),

            /**
             * Table Body Selector
             *
             * @type {object}
             */
            $tbody = null,

            /**
             * Default Options for Extension
             *
             * @type {object}
             */
            defaults = {
                'addclass': 'clsDnd', // classname added to body
                'disabledclass': 'sort-disabled', // classname added to body
                'handle': false // handler which enables the sortable
            },

            /**
             * Final Extension Options
             *
             * @type {object}
             */
            options = $.extend(true, {}, defaults, data),

            /**
             * Module Object
             *
             * @type {object}
             */
            module = {};

        // ------------------------------------------------------------------------
        // INITIALIZATION
        // ------------------------------------------------------------------------

        /**
         * Setup Dummies
         */
        var setupDummies = function () {
            // On drag stop, update dummy line visibility
            $tbody.each(function () {
                var $self = $(this),
                    $sortDisabled = $self.find('.' + options.disabledclass);

                if ($self.children().length > 1) {
                    $sortDisabled.hide();
                } else {
                    $sortDisabled.show();
                }

                var rowHidden = $sortDisabled.clone();
                $sortDisabled.remove();
                $self.prepend(rowHidden);

            });
        };

        /**
         * Initialize method of the extension, called by the engine.
         */
        module.init = function (done) {
            $tbody = $this.find('tbody');
            var strTimestamp = parseInt(new Date().getTime() * Math.random(), 10),
                strClsDnd = options.addclass + '_' + strTimestamp,
                config = {
                    'handle': options.handle,
                    'connectWith': '.' + strClsDnd,
                    'containment': $this,
                    'sort': function (event, ui) {
                        $(event.target).each(function () {
                            var $self = $(this),
                                $sortDisabled = $self.find('.' + options.disabledclass);

                            if ($self.children().length > 2) {
                                $sortDisabled.hide();
                            } else {
                                $sortDisabled.show();
                                var rowHidden = $sortDisabled.clone();
                                $sortDisabled.remove();
                                $self.append(rowHidden);
                            }
                        });

                    },
                    'stop': function (event, ui) {
                        setupDummies();
                        // Trigger an update event on table
                        $this.trigger('tablednd.update', []);
                    }
                };

            // Add a special class and start the sortable plugin.
            $tbody
                .addClass(strClsDnd)
                .sortable(config);

            setupDummies();

            done();
        };

        // Return data to module engine.
        return module;
    });