// {{{ICINGA_LICENSE_HEADER}}}
/**
 * This file is part of Icinga 2 Web.
 *
 * Icinga 2 Web - Head for multiple monitoring backends.
 * Copyright (C) 2013 Icinga Development Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @copyright  2013 Icinga Development Team <info@icinga.org>
 * @license    http://www.gnu.org/licenses/gpl-2.0.txt GPL, version 2
 * @author     Icinga Development Team <info@icinga.org>
 */
// {{{ICINGA_LICENSE_HEADER}}}

/**
 * A component registry that maps components to unique IDs and keeps track
 * of component types to allow easy querying
 *
 */
define(['jquery'], function($) {
    "use strict";

    var ComponentRegistry = function() {
        var self = this;

        /**
         * Map ids to components
         */
        var components = {};

        /**
         * Generate a new component id
         */
        var createId = (function() {
            var id = 0;
            return function() {
                return 'icinga-component-' + id++;
            };
        })();

        /**
         * Get the id of the given component, if one is assigned
         *
         * @param   {*}             component   The component of which the id should be retrieved
         *
         * @returns {String|null}               The id of the component, or null
         */
        this.getId = function(cmp) {
            var id = null;
            $.each(components, function(key, value) {
                if (value && value.cmp === cmp) {
                    id = key;
                }
            });
            return id;
        };

        /**
         * Get the component that is assigned to the given id
         *
         * @param   {String}        id          The id of the component
         *
         * @returns {*}                         The component or null
         */
        this.getById = function(id) {
            return components[id] && components[id].cmp;
        };

        /**
         * Get all components that match the given type
         *
         * @param   {String}        type        The component type in the form '<module>/<component>'
         *
         * @returns {*|Array}                   The components or an empty array
         */
        this.getByType = function(type) {
            return $.map(components, function(entry) {
                return entry.type === type ? entry.cmp : null;
            });
        };

        /**
         * Get all components
         *
         * @returns {*|Array}                   The components or an empty array
         */
        this.getComponents = function() {
            return $.map(components, function(entry) {
                return entry.cmp;
            });
        };

        /**
         * Add the given component to the registry and return the assigned id
         *
         * @param {*}               cmp         The component to add
         * @param {String}          id          The optional id that should be assigned to that component
         * @param {String}          type        The component type to load '<module>/<component>'
         *
         * @returns {*|Array}
         */
        this.add = function(cmp, type) {
            var id = createId();
            components[id] = {
                cmp:    cmp,
                type:   type,
                active: true
            };
            return id;
        };

        /**
         * Mark all components inactive
         */
        this.markAllInactive = function() {
            $.each(components,function(index, el){
                if (el && el.active) {
                    el.active = false;
                }
            });
        };

        /**
         * Mark the component with the given id as active
         */
        this.markActive = function(id) {
            if (components[id]) {
                components[id].active = true;
            }
        };

        /**
         * Let the garbage collection remove all inactive components
         */
        this.removeInactive = function() {
            $.each(components, function(key,value) {
                if (!value || !value.active) {
                    delete components[key];
                }
            });
        };
    };
    return new ComponentRegistry();
});