"use strict";

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

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

/**
 * @class ViewsManager
 * @constructor
 * @param {!AnP} anp 
 * @return {void}
 * @access public
 * @static
 */
export const ViewsManager = (function(){

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

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

        /** @type {ViewsManager} */
        const self = this, 
              /** @type {Object.<string, Object.<string, any|null>>} */
              views = {};
        /** @type {boolean} */
        let started = false;

        /**
         * @returns {void}
         * @access private
         */
        const constructor = () => {};
        
        /**
         * @param {?continue_callback} callback 
         * @returns {boolean}
         * @access public
         */
        this.update = (callback = null) => {
            Common.execute_array(["default_views_files", "views_files", "default_views", "views"], (key, next) => {
                self.add(self.get(key), true, next);
            }, callback, true);
        };

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

            Common.clear_dictionary(views);

            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(true));

            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 {?(Object.<string, any|null>|Array.<any|null>)} inputs 
         * @param {!boolean} [overwrite = false] 
         * @param {?continue_callback} [callback = null] 
         * @return {void}
         * @access public
         */
        this.add = (inputs, overwrite = false, callback = null) => {
            anp.files.load_json(inputs, data => {
                data.forEach(set => {
                    Object.entries(set).forEach(([key, value]) => {
                        if(overwrite || !views[key])
                            views[key] = value;
                    });
                });
                Common.execute(callback, true);
            }, true);
        };

        this.get = (key, inputs = null) => {};

        constructor();
    };

    return ViewsManager;
})();