"use string";

import {Utils} from "../Utils/Utils.ecma.js";

/**
 * @callback anp_events_manager_callback
 * @param {...any} [parameters] 
 * @returns {any|null}
 */

/**
 * @class
 * @constructor
 * @param {?(Object.<string, any|null>|Array.<any|null>)} [inputs = null] 
 * @returns {void}
 * @access public
 */
export const EventsManager = (function(){

    /**
     * @constructs EventsManager
     * @param {?(Object.<string, any|null>|Array.<any|null>)} [inputs = null] 
     * @returns {void}
     * @access private
     */
    const EventsManager = function(inputs = null){

        /** @type {Array.<anp_events_manager_callback|null>} */
        const events = [];

        /** @type {boolean} */
        this.autoexecute = Utils.get_value("autoexecute", inputs, false);

        /**
         * @param  {...any} [parameters] 
         * @returns {Array.<any|null>}
         * @access public
         */
        this.execute = (...parameters) => events.map(callback => callback ? callback(...parameters) : null);

        /**
         * @param {!anp_events_manager_callback} callback 
         * @returns {number}
         * @access public
         */
        this.add = callback => {

            /** @type {number} */
            let i = -1;
            /** @type {number} */
            const l = events.length;

            while(++ i < l)
                if(!events[i])
                    break;
            events[i] = callback;

            return i;
        };

        /**
         * @param {!number} i 
         * @returns {void}
         * @access public
         */
        this.remove = i => {
            events[i] && (events[i] = null);
        };

    };

    return EventsManager;
})();