/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2022 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

define('metadata', [], function () {

    /**
     * Application metadata.
     *
     * @class
     * @name Class
     * @memberOf module:metadata
     *
     * @param {module:cache.Class} [cache] A cache.
     */
    let Metadata = function (cache) {
        /**
         * @private
         * @type {module:cache.Class|null}
         */
        this.cache = cache || null;

        /**
         * @private
         * @type {Object}
         */
        this.data = {};
    };

    _.extend(Metadata.prototype, /** @lends module:metadata.Class# */{

        /**
         * @private
         */
        url: 'Metadata',

        /**
         * Load from cache or the backend (if not yet cached).
         *
         * @param {Function|null} [callback] Deprecated. Use a promise.
         * @param {boolean} [disableCache=false] Bypass cache.
         * @returns {Promise}
         */
        load: function (callback, disableCache) {
            this.off('sync');

            if (callback) {
                this.once('sync', callback);
            }

            if (!disableCache) {
                 if (this.loadFromCache()) {
                    this.trigger('sync');

                    return new Promise(resolve => resolve());
                }
            }

            return new Promise(resolve => {
                this.fetch()
                    .then(() => resolve());
            });
        },

        /**
         * Load from the server.
         *
         * @returns {Promise}
         */
        loadSkipCache: function () {
            return this.load(null, true);
        },

        /**
         * @private
         * @returns {Promise}
         */
        fetch: function () {
            return Espo.Ajax
                .getRequest(this.url, null, {
                    dataType: 'json',
                    success: data => {
                        this.data = data;
                        this.storeToCache();
                        this.trigger('sync');
                    },
                });
        },

        /**
         * Get a value.
         *
         * @param {string[]|string} path A key path.
         * @param {*} [defaultValue] A value to return if not set.
         * @returns {*} Null if not set.
         */
        get: function (path, defaultValue) {
            defaultValue = defaultValue || null;

            let arr;

            if (Array && Array.isArray && Array.isArray(path)) {
                arr = path;
            }
            else {
                arr = path.split('.');
            }

            let pointer = this.data;
            let result = defaultValue;

            for (var i = 0; i < arr.length; i++) {
                let key = arr[i];

                if (!(key in pointer)) {
                    result = defaultValue;

                    break;
                }

                if (arr.length - 1 === i) {
                    result = pointer[key];
                }

                pointer = pointer[key];
            }

            return result;
        },

        /**
         * @private
         * @returns {boolean} True if success.
         */
        loadFromCache: function () {
            if (this.cache) {
                let cached = this.cache.get('app', 'metadata');

                if (cached) {
                    this.data = cached;

                    return true;
                }
            }

            return null;
        },

        /**
         * @private
         */
        storeToCache: function () {
            if (this.cache) {
                this.cache.set('app', 'metadata', this.data);
            }
        },

        /**
         * Clear cache.
         */
        clearCache: function () {
            if (!this.cache) {
                return;
            }

            this.cache.clear('app', 'metadata');
        },

        /**
         * Get a scope list.
         *
         * @returns {string}
         */
        getScopeList: function () {
            let scopes = this.get('scopes') || {};
            let scopeList = [];

            for (let scope in scopes) {
                var d = scopes[scope];

                if (d.disabled) {
                    continue;
                }

                scopeList.push(scope);
            }

            return scopeList;
        },

        /**
         * Get an object-scope list. An object-scope represents a business entity.
         *
         * @returns {string[]}
         */
        getScopeObjectList: function () {
            let scopes = this.get('scopes') || {};
            let scopeList = [];

            for (let scope in scopes) {
                let d = scopes[scope];

                if (d.disabled) {
                    continue;
                }

                if (!d.object) {
                    continue;
                }

                scopeList.push(scope);
            }

            return scopeList;
        },

        /**
         * Get an entity-scope list. Scopes that represents entities.
         *
         * @returns {string[]}
         */
        getScopeEntityList: function () {
            var scopes = this.get('scopes') || {};
            var scopeList = [];

            for (let scope in scopes) {
                let d = scopes[scope];

                if (d.disabled) {
                    continue;
                }

                if (!d.entity) {
                    continue;
                }

                scopeList.push(scope);
            }

            return scopeList;
        }

    }, Backbone.Events);

    return Metadata;
});