const express = require('express');
const app = express();
const http = require('http');
const server = http.createServer(app);
const { Server, Socket } = require("socket.io");
const { instrument } = require("@socket.io/admin-ui");
const io = new Server(server);

class Client {
    constructor(login, password) {
        this.login = login;
        this.password = password;
    }
}

class Game {
    constructor(id, player1, player2) {
        this.id = id;
        this.player1 = player1;
        this.player2 = player2;
        this.turn = 1;
        this.board = [
            [0, 0, 0],
            [0, 0, 0],
            [0, 0, 0]
        ];
    }
}

/** @type {Client[]} */
let registeredClients = [];

/** @type {Map<Socket, Client>} */
let onlineClients = new Map();

let games = [];

app.get('/', (req, res) => {
    res.send('<h1>Hello world</h1>');
});

io.on('connection', (socket) => {
    console.log('someone connected');

    socket.on('register', (login, password) => {
        console.log('user send register with login: ' + login + ' and password: ' + password);
        if (login.length < 3 || login.length > 20 || password.length < 3 || password.length > 20) {
            socket.emit('register', false, 'Login or password is too short or too long');
            console.log('user tried to register with too short or too long login or password');
            return;
        }
        if (registeredClients.find(client => client.login === login)) {
            socket.emit('register', false, 'User with this login already exists');
            console.log('user tried to register with existing login');
            return;
        }
        registeredClients.push(new Client(login, password));
        onlineClients.set(socket, new Client(login, password));
        socket.emit('register', true, 'User registered successfully');
        console.log('user registered successfully');
    });

    socket.on('login', (login, password) => {
        console.log('user send login with login: ' + login + ' and password: ' + password);
        if (login.length < 3 || login.length > 20 || password.length < 3 || password.length > 20) {
            socket.emit('login', false, 'Login or password is too short or too long');
            console.log('user tried to login with too short or too long login or password');
            return;
        }
        if (!registeredClients.find(client => client.login === login)) {
            socket.emit('login', false, 'User with this login does not exist');
            console.log('user tried to login with non existing login');
            return;
        }
        if (registeredClients.find(client => client.login === login && client.password !== password)) {
            socket.emit('login', false, 'Wrong password');
            console.log('user tried to login with wrong password');
            return;
        }
        onlineClients.set(socket, new Client(login, password));
        socket.emit('login', true, 'User logged in successfully');
    });

    socket.on('disconnect', () => {
        if (onlineClients.has(socket)) {
            console.log('user ' + onlineClients.get(socket).login + ' disconnected');
        } else {
            console.log('anonymous disconnected');
        }
    });
});

instrument(io, {
    auth: false
});

server.listen(9800, () => {
    console.log('listening on *:9800');
});