// Configuration for MacroPad Relay Server

import dotenv from 'dotenv';
import path from 'path';

dotenv.config();

function parseTrustProxy(): boolean | number | string {
  const v = process.env.TRUST_PROXY ?? '1';
  if (v === 'false') return false;
  if (v === 'true') return true;
  const n = Number(v);
  return Number.isNaN(n) ? v : n;
}

export const config = {
  port: parseInt(process.env.PORT || '3000', 10),
  host: process.env.HOST || '0.0.0.0',

  // Data storage
  dataDir: process.env.DATA_DIR || path.join(__dirname, '..', 'data'),

  // Session settings
  sessionIdLength: parseInt(process.env.SESSION_ID_LENGTH || '12', 10),

  // Maximum number of sessions that may exist at once
  maxSessions: parseInt(process.env.MAX_SESSIONS || '1000', 10),

  // Minimum password length enforced when creating a new session
  minPasswordLength: parseInt(process.env.MIN_PASSWORD_LENGTH || '6', 10),

  // Sessions unused for this many days are pruned
  sessionTtlDays: parseInt(process.env.SESSION_TTL_DAYS || '90', 10),

  // Security
  bcryptRounds: parseInt(process.env.BCRYPT_ROUNDS || '10', 10),

  // Rate limiting (HTTP)
  rateLimitWindowMs: parseInt(process.env.RATE_LIMIT_WINDOW_MS || '900000', 10), // 15 minutes
  rateLimitMax: parseInt(process.env.RATE_LIMIT_MAX || '300', 10),

  // WebSocket upgrade rate limiting (per IP)
  wsUpgradeWindowMs: parseInt(process.env.WS_UPGRADE_WINDOW_MS || '60000', 10), // 1 minute
  wsUpgradeMax: parseInt(process.env.WS_UPGRADE_MAX || '60', 10), // max upgrades per IP per window

  // Auth brute-force protection
  authMaxSocketFailures: parseInt(process.env.AUTH_MAX_SOCKET_FAILURES || '5', 10),
  authLockoutMaxAttempts: parseInt(process.env.AUTH_LOCKOUT_MAX_ATTEMPTS || '10', 10),
  authLockoutWindowMs: parseInt(process.env.AUTH_LOCKOUT_WINDOW_MS || '900000', 10), // 15 minutes
  authLockoutDurationMs: parseInt(process.env.AUTH_LOCKOUT_DURATION_MS || '900000', 10), // 15 minutes

  // WebSocket
  pingInterval: parseInt(process.env.PING_INTERVAL || '30000', 10), // 30 seconds
  requestTimeout: parseInt(process.env.REQUEST_TIMEOUT || '30000', 10), // 30 seconds

  // Origin / CORS allowlist (comma-separated). Empty = same-host only.
  allowedOrigins: (process.env.ALLOWED_ORIGINS || '')
    .split(',')
    .map((o) => o.trim())
    .filter((o) => o.length > 0),

  // Trust the X-Forwarded-* headers from a reverse proxy
  trustProxy: parseTrustProxy(),

  // Logging
  logLevel: process.env.LOG_LEVEL || 'info',

  // Environment
  nodeEnv: process.env.NODE_ENV || 'development',
  isDevelopment: process.env.NODE_ENV !== 'production',
};