/**
 * main storage object ...
 */
const windows = {};

/**
 * retrieve all exists window id's ...
 * 
 * @returns an array of strings which represents window id's ...
 */
function keys() {
    return Object.keys(windows);
}

/**
 * retrieve all available windows ...
 * 
 * @returns an array of strings which represent BrowserWindow Objects ...
 */
function values() {
    return Object.values(windows);
}

/**
 * retrieve count of available windows ...
 * 
 * @returns number
 */
function count() {
    return Object.keys(windows).length;
}

/**
 * check a BrowserWindow id exists or not ...
 * 
 * @param {string} key window id ...
 * @returns a boolean value which represent window exists or not ...
 */
function has(key) {
    //
    if (!key) {
        return false;
    }

    //
    return keys()
        .includes(key);
}

/**
 * retrieve a window by providing it's id ...
 * 
 * @param {string} key window id ...
 * @returns an instance of Browserwindow instance ...
 */
function get(key) {
    //
    if (!has(key)) {
        return undefined;
    }

    //
    return windows[key];
}

/**
 * set a window by it's id ...
 * 
 * @param {string} key window id ...
 * @param {BrowserWindow} value specified window instance ...
 * @returns a boolean value ...
 */
function set(key, value) {
    //
    try {
        windows[key] = value;
        return true;
    } catch {
        return false;
    }
}

/**
 * remove a key/value from windows ...
 * 
 * @param {string} key window id ...
 * @returns a boolean value ...
 */
function remove(key) {
    //
    if (!has(key)) {
        return false;
    }

    //
    try {
        //
        delete windows[key];
        return true;
    } catch {
        return false;
    }
}

/**
 * clear all registered objects ...
 */
function clear() {
    windows = {};
}

module.exports = {
    //
    windows: windows,

    //
    has: has,
    get: get,
    set: set,
    keys: keys,
    count: count,
    clear: clear,
    values: values,
    remove: remove,
}