import express, { Express, Request, Response } from "express";
import http from "http";
import { v4 as uuidv4 } from "uuid";

import { Server, Socket } from "socket.io";
import { instrument } from "@socket.io/admin-ui";

import { pallette, availableColors } from "./pallette";

const app = express();
const server = http.createServer(app);

const io = new Server(server, {
    cors: {
        origin: ["https://admin.socket.io"],
        credentials: true,
    },
});

class Client {
    private _login: String;
    private _password: String;
    private _inGame: Boolean;

    public get login() {
        return this._login;
    }
    public get password() {
        return this._password;
    }
    public get inGame() {
        return this._inGame;
    }

    constructor(login: String, password: String) {
        this._login = login;
        this._password = password;
        this._inGame = false;
    }

    public setInGame(inGame: Boolean) {
        this._inGame = inGame;
    }

    public simplify() {
        return {
            login: this.login,
            inGame: this.inGame,
        };
    }
}

class Game {
    private id: String;
    private guesser: Client;
    private suggester: Client;
    private tries: number;

    private guesses: Set<String>;
    private colors: Set<String>;

    public get Id() {
        return this.id;
    }
    public get Guesser() {
        return this.guesser;
    }
    public get Suggester() {
        return this.suggester;
    }
    public get Tries() {
        return this.tries;
    }
    public get Guesses() {
        return this.guesses;
    }
    public get Colors() {
        return this.colors;
    }

    constructor(id: String, guesser: Client, suggester: Client, tries: number) {
        this.id = id;
        this.guesser = guesser;
        this.suggester = suggester;
        this.tries = tries;
        this.guesses = new Set<String>();
        this.colors = new Set<String>();

        while (this.colors.size < 6) {
            const key = availableColors[Math.floor(Math.random() * availableColors.length)];
            this.colors.add(key);
        }
    }

    public Opponent(player: Client): Client {
        if (this.guesser === player) {
            return this.suggester;
        }
        return this.guesser;
    }

    public Guess(player: Client, guess: String) {
        if (this.guesses.has(guess)) {
            return true;
        }
        this.guesses.add(guess);
        const opponent = this.Opponent(player);
        const opponentSocket = Array.from(onlineClients.keys()).find((socket) => onlineClients.get(socket) === opponent);
        if (opponentSocket) {
            opponentSocket.emit("guess", guess);
        } else {
            console.log("opponent socket not found");
            return false;
        }
        return true;
    }

    public GameWon() {
        for (const color of this.colors) {
            if (!this.guesses.has(color)) {
                return false;
            }
        }
        return true;
    }

    public GameLost() {
        const countOfGuesses = this.guesses.size;
        const countOfCorrectGuesses = Array.from(this.guesses).filter((guess) => this.colors.has(guess)).length;
        return countOfGuesses - countOfCorrectGuesses >= this.tries;
    }

    public simplify() {
        return {
            id: this.id,
            guesser: this.guesser.login,
            suggester: this.suggester.login,
            tries: this.tries,
        };
    }
}

class AvailableGame {
    private _id: String;
    private _player: Client;
    private _tries: number;
    private _neededRole: String;

    public get id(): String {
        return this._id;
    }
    public get player(): Client {
        return this._player;
    }
    public get tries(): number {
        return this._tries;
    }
    public get neededRole(): String {
        return this._neededRole;
    }

    constructor(id: String, player: Client, tries: number, neededRole: String) {
        this._id = id;
        this._player = player;
        this._tries = tries;
        this._neededRole = neededRole;
    }

    simplify() {
        return {
            id: this.id,
            player: this.player.login,
            tries: this.tries,
            neededRole: this.neededRole,
        };
    }
}

let registeredClients: Client[] = [];
let onlineClients: Map<Socket, Client> = new Map<Socket, Client>();
let availableGames: Map<String, AvailableGame> = new Map<String, AvailableGame>();
let runningGames: Map<String, Game> = new Map<String, Game>();

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

app.get("/pallette", (req, res) => {
    res.json(pallette);
});

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

    socket.emit("hello", "I don't know you");

    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");

        registerSocketLoggedInFunctions(socket);

        io.emit("updateNeeded");
    });

    socket.on("disconnect", () => {
        const client = onlineClients.get(socket);
        if (client !== undefined) {
            console.log("user " + client.login + " disconnected");
            for (const game of Array.from(availableGames.values())) {
                if (game.player === client) {
                    availableGames.delete(game.id);
                    return;
                }
            }
            if (client.inGame) {
                const game = Array.from(runningGames.values()).find((game) => game.Guesser === client || game.Suggester === client);
                if (game !== undefined) {
                    const opponentPlayer = game.Opponent(client);
                    const otherClientSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === opponentPlayer.login);
                    if (otherClientSocket !== undefined) {
                        otherClientSocket.emit("leaveGameResponse", true, 410);
                    }
                    client.setInGame(false);
                    opponentPlayer.setInGame(false);

                    runningGames.delete(game.Id);
                }
            }
            onlineClients.delete(socket);
        } else {
            console.log("anonymous disconnected");
        }

        io.emit("updateNeeded");
    });
});

instrument(io, {
    mode: "development",
    auth: {
        type: "basic",
        username: "admin",
        password: "$2a$12$84FqmSh7yVv46tdygZ2rNuJYqWPXYtYC3JxjSJBY8PyXB0Oe8qCfO",
    },
});

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

function registerSocketLoggedInFunctions(socket: Socket) {
    socket.on("getUpdate", getUpdateEventHandler);
    socket.on("createGame", createGameEventHandler);
    socket.on("joinGame", joinGameEventHandler);
    socket.on("removeGame", removeGameEventHandler);
    socket.on("chat", chatEventHandler);
    socket.on("guess", guessEventHandler);
    socket.on("leaveGame", leaveGameEventHandler);

    const client = onlineClients.get(socket)!;

    function getUpdateEventHandler(): void {
        socket.emit("update", true, {
            availableGames: Array.from(availableGames.values()).map((e) => e.simplify()),
        });
    }

    function createGameEventHandler(tries: number, role: String): void {
        if (client.inGame) {
            socket.emit("createGameResponse", false, "Player is already in game");
            return;
        }

        if (tries < 20 || tries > 50) {
            socket.emit("createGameResponse", false, "Tries must be between 20 and 50");
            return;
        }

        if (role !== "guesser" && role !== "suggester") {
            socket.emit("createGameResponse", false, "Role must be 'guesser' or 'suggester'");
            return;
        }

        for (const game of Array.from(availableGames.values())) {
            if (game.player.login === client.login) {
                socket.emit("createGameResponse", false, "You already created a game");
                return;
            }
        }

        const game = new AvailableGame(uuidv4(), client, tries, role);
        availableGames.set(game.id, game);
        io.emit("updateNeeded");
    }

    function joinGameEventHandler(gameId: String): void {
        const game = availableGames.get(gameId);
        if (game === undefined) {
            socket.emit("joinGameResponse", false, "Game does not exist");
            return;
        }

        if (game.player.login === client.login) {
            socket.emit("joinGameResponse", false, "You cannot join your own game");
            return;
        }

        if (game.player.inGame) {
            socket.emit("joinGameResponse", false, "Player is already in game");
            return;
        }

        const gameSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === game.player.login);
        if (gameSocket === undefined) {
            socket.emit("joinGameResponse", false, "Player is not online");
            return;
        }

        availableGames.delete(gameId);
        io.emit("updateNeeded");

        let suggester: Client;
        let guesser: Client;
        if (game.neededRole === "suggester") {
            suggester = client;
            guesser = game.player;
        } else {
            suggester = game.player;
            guesser = client;
        }
        suggester.setInGame(true);
        guesser.setInGame(true);
        const gameInfo = new Game(uuidv4(), guesser, suggester, game.tries);
        const suggesterSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === suggester.login)!;
        const guesserSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === guesser.login)!;
        suggesterSocket.emit("joinGameResponse", true, gameInfo.simplify(), Array.from(gameInfo.Colors));
        guesserSocket.emit("joinGameResponse", true, gameInfo.simplify(), []);
        runningGames.set(gameInfo.Id, gameInfo);
    }

    function removeGameEventHandler(gameId: String): void {
        const game = availableGames.get(gameId);
        if (game === undefined) {
            socket.emit("removeGameResponse", false, "Game does not exist");
            return;
        }

        if (game.player.login !== client.login) {
            socket.emit("removeGameResponse", false, "You cannot remove game that is not yours");
            return;
        }

        availableGames.delete(gameId);
        io.emit("updateNeeded");
    }

    function chatEventHandler(gameId: String, message: String): void {
        const game = runningGames.get(gameId);
        if (game === undefined || !client.inGame) {
            socket.emit("chatResponse", false, 400);
            console.log("user " + client.login + " tried to chat in non existing game");

            return;
        }

        const opponentPlayer = game.Opponent(client);
        const otherClientSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === opponentPlayer.login);
        if (otherClientSocket === undefined) {
            socket.emit("chatResponse", false, 404);
            console.log("user " + client.login + " tried to chat with non existing user");

            return;
        }

        socket.emit("chatResponse", true, {
            from: client.login,
            message,
        });
        otherClientSocket.emit("chatResponse", true, {
            from: client.login,
            message,
        });
    }

    function guessEventHandler(gameId: String, guess: String): void {
        const game = runningGames.get(gameId);
        if (game === undefined || !client.inGame) {
            socket.emit("guessResponse", false, 400);
            console.log("user " + client.login + " tried to guess in non existing game");

            return;
        }

        if (game.Guesser.login !== client.login) {
            socket.emit("guessResponse", false, 400);
            console.log("user " + client.login + " tried to guess in game he is not guessing in");

            return;
        }

        if (!game.Guess(client, guess)) {
            socket.emit("guessResponse", false, 400);
            console.log("user " + client.login + " tried to guess but something gone terribly wrong");

            return;
        }

        const opponentPlayer = game.Opponent(client);
        const otherClientSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === opponentPlayer.login)!;
        if (game.GameWon()) {
            console.log(`game ${gameId} won by ${client.login} and ${opponentPlayer.login}`);

            socket.emit("gameStatus", [true]);
            otherClientSocket.emit("gameStatus", [true]);

            client.setInGame(false);
            opponentPlayer.setInGame(false);
            runningGames.delete(gameId);
            return;
        }
        if (game.GameLost()) {
            console.log(`game ${gameId} lost by ${client.login} and ${opponentPlayer.login}`);

            socket.emit("gameStatus", [false]);
            otherClientSocket.emit("gameStatus", [false]);

            client.setInGame(false);
            opponentPlayer.setInGame(false);
            runningGames.delete(gameId);
        }
    }

    function leaveGameEventHandler(gameId: String): void {
        const game = runningGames.get(gameId);
        if (game === undefined || !client.inGame) {
            socket.emit("guessResponse", false, 400);
            console.log("user " + client.login + " tried to guess in non existing game");

            return;
        }

        socket.emit("leaveGameResponse", true, 200);
        const opponentPlayer = game.Opponent(client);
        const otherClientSocket = Array.from(onlineClients.keys()).find((key) => onlineClients.get(key)?.login === opponentPlayer.login);
        if (otherClientSocket !== undefined) {
            otherClientSocket.emit("leaveGameResponse", true, 410);
        }

        client.setInGame(false);
        opponentPlayer.setInGame(false);
        runningGames.delete(game.Id);
    }
}