"use strict";

import {Check} from "../Utils/Checks.ecma.js";
import {Common} from "../Utils/Common.ecma.js";

/**
 * @typedef {import("../Application/AnP.ecma.js").AnP} AnP
 */

/**
 * @class ModelsManager
 * @constructor
 * @param {!AnP} anp 
 * @returns {void}
 * @access private
 * @static
 */
export const ModelsManager = (function(){

    /**
     * @callback default_callback
     * @return {void}
     */

    /**
     * @callback continue_callback
     * @param {!boolean} ok 
     * @return {boolean}
     */

    /**
     * @constructs ModelsManager
     * @param {!AnP} anp 
     * @returns {void}
     * @access private
     * @static
     */
    const ModelsManager = function(anp){

        /** @type {ModelsManager} */
        const self = this, 
              /** @type {Object.<string, Object.<string, any|null>|Function>} */
              models = {};

        /**
         * @returns {void}
         * @access private
         */
        const constructor = () => {};

        /**
         * @param {?continue_callback} callback 
         * @returns {boolean}
         * @access public
         */
        this.update = (callback = null) => {

            Common.execute(callback);

        };

        /**
         * @param {?continue_callback} callback 
         * @returns {boolean}
         * @access public
         */
        this.reset = (callback = null) => {

            Common.clear_dictionary(models);

            self.update(callback);

        };

        /**
         * @param {?continue_callback} callback 
         * @returns {boolean}
         * @access public
         */
        this.start = (callback = null) => {

            /** @type {continue_callback} */
            const end = ok => Common.execute(callback, ok);

            if(started){
                end(false);
                return false;
            };
            started = true;

            self.update(end);

            return true;
        };

        /**
         * @param {?continue_callback} callback 
         * @returns {boolean}
         * @access public
         */
        this.close = (callback = null) => {

            /** @type {continue_callback} */
            const end = ok => Common.execute(callback, ok);

            if(!started){
                end(false);
                return false;
            };
            started = false;

            end(true);

            return true;
        };

        /**
         * @param {?any} inputs 
         * @param {!boolean} [overwrite = false] 
         * @param {?default_callback} [callback = null] 
         * @return {void}
         * @access public
         */
        this.add = (inputs, overwrite = false, callback = null) => {
            anp.files.load_json(inputs, data => {
                Object.entries(data).forEach(([key, Model]) => {
                    Model && 
                    (overwrite || !models[key]) && 
                    (Check.is_function(Model) || Check.is_object(Model)) && 
                    (models[key] = Model);
                });
                Common.execute(callback);
            }, true);
        };

        /**
         * @param {!string} name 
         * @returns {Object.<string, any|null>|Function|null}
         */
        this.get = name => models[name] || null;

        constructor();

    };

    return ModelsManager;

})();