/**
 * Network protocol for client-server communication
 * Matches the Python protocol implementation
 */

const MessageType = {
    // Client -> Server
    JOIN: 'JOIN',
    MOVE: 'MOVE',
    START_GAME: 'START_GAME',
    LEAVE: 'LEAVE',

    // Server -> Client
    WELCOME: 'WELCOME',
    STATE_UPDATE: 'STATE_UPDATE',
    PLAYER_JOINED: 'PLAYER_JOINED',
    PLAYER_LEFT: 'PLAYER_LEFT',
    GAME_STARTED: 'GAME_STARTED',
    GAME_OVER: 'GAME_OVER',
    ERROR: 'ERROR'
};

class Message {
    constructor(type, data = {}) {
        this.type = type;
        this.data = data;
    }

    toJSON() {
        return JSON.stringify({
            type: this.type,
            data: this.data
        });
    }

    static fromJSON(jsonStr) {
        const obj = JSON.parse(jsonStr);
        return new Message(obj.type, obj.data || {});
    }
}

// Helper functions for creating messages
function createJoinMessage(playerName) {
    return new Message(MessageType.JOIN, { player_name: playerName });
}

function createMoveMessage(direction) {
    return new Message(MessageType.MOVE, { direction: direction });
}

function createStartGameMessage() {
    return new Message(MessageType.START_GAME);
}

function createLeaveMessage() {
    return new Message(MessageType.LEAVE);
}

// Direction constants (matching Python)
const Direction = {
    UP: [0, -1],
    DOWN: [0, 1],
    LEFT: [-1, 0],
    RIGHT: [1, 0]
};