"use strict";

/**
 * @class Options
 * @constructor
 * @returns {void}
 * @access public
 * @static
 */
export const Options = (function(){

    /**
     * @constructs Options
     * @returns {void}
     * @access private
     * @static
     */
    const Options = function(options, _default = null){

        /** @type {Options} */
        const self = this;

        /** @type {boolean|null} */
        this.overwrite = null;
        /** @type {boolean|null} */
        this.allow_nulls = null;

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

            _default || (_default = Options.DEFAULT);

            [
                ["overwrite", Options.OVERWRITE],
                ["allow_nulls", Options.NULLISH]
            ].forEach(([key, option]) => {

                /** @type {boolean|null} */
                const value = Options.get_value(options, option);

                self[key] = value !== null ? value : _default[key];

            });

        };

        /**
         * @returns {number}
         * @access public
         */
        this.get = () => {

            /** @type {number} */
            let code = 0;

            [
                [Options.OVERWRITING, self.overwrite], 
                [Options.NULLISH, self.allow_nulls], 
            ].forEach(([option, value]) => {
                code += (
                    value ? 1 : 
                    value === false ? 2 : 
                0) * 3 ** option;
            });

            return code;
        };

        constructor();

    };

    /** @type {number} */
    Options.OVERWRITING = 0;
    /** @type {number} */
    Options.OVERWRITE = 1 + 3 * Options.OVERWRITING;
    /** @type {number} */
    Options.NO_OVERWRITE = 2 + 3 * Options.OVERWRITING;

    /** @type {number} */
    Options.NULLISH = 1;
    /** @type {number} */
    Options.ALLOW_NULLS = 1 + 3 * Options.NULLISH;
    /** @type {number} */
    Options.NOT_NULLS = 2 + 3 * Options.NULLISH;

    /** @type {Options} */
    Options.DEFAULT = new Options(Options.NO_OVERWRITE | Options.ALLOW_NULLS);

    /**
     * @param {!number} value 
     * @param {!number} option 
     * @returns {boolean|null}
     * @access public
     * @static
     */
    Options.get_value = (value, option) => {

        /** @type {number} */
        const ternary = (value / 3 ** option >> 0) % 3;

        return (
            ternary === 1 ? true :
            ternary === 2 ? false :
            null
        );
    }

    return Options;
})();