backend/src/config/configuration.ts

export default () => ({
  // Application
  app: {
    name: process.env.APP_NAME || 'Real Estate Agent Platform',
    env: process.env.NODE_ENV || 'development',
    port: parseInt(process.env.PORT || '3001', 10),
    apiUrl: process.env.API_URL || 'http://localhost:3001',
    frontendUrl: process.env.FRONTEND_URL || 'http://localhost:3000',
    adminUrl: process.env.ADMIN_URL || 'http://localhost:3002',
  },

  // Database
  database: {
    url: process.env.DATABASE_URL,
  },

  // JWT Authentication
  jwt: {
    secret: process.env.JWT_SECRET,
    accessExpiration: process.env.JWT_ACCESS_EXPIRATION || '15m',
    refreshExpiration: process.env.JWT_REFRESH_EXPIRATION || '7d',
  },

  // Password Hashing
  bcrypt: {
    saltRounds: parseInt(process.env.BCRYPT_SALT_ROUNDS || '12', 10),
  },

  // Google OAuth
  google: {
    clientId: process.env.GOOGLE_CLIENT_ID,
    clientSecret: process.env.GOOGLE_CLIENT_SECRET,
    callbackUrl: process.env.GOOGLE_CALLBACK_URL,
  },

  // Facebook OAuth
  facebook: {
    appId: process.env.FACEBOOK_APP_ID,
    appSecret: process.env.FACEBOOK_APP_SECRET,
    callbackUrl: process.env.FACEBOOK_CALLBACK_URL,
  },

  // AWS S3
  aws: {
    accessKeyId: process.env.AWS_ACCESS_KEY_ID,
    secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
    region: process.env.AWS_REGION || 'us-east-1',
    s3Bucket: process.env.AWS_S3_BUCKET,
  },

  // Email
  mail: {
    host: process.env.MAIL_HOST,
    port: parseInt(process.env.MAIL_PORT || '587', 10),
    user: process.env.MAIL_USER,
    password: process.env.MAIL_PASSWORD,
    from: process.env.MAIL_FROM,
  },

  // Stripe
  stripe: {
    secretKey: process.env.STRIPE_SECRET_KEY,
    webhookSecret: process.env.STRIPE_WEBHOOK_SECRET,
    publishableKey: process.env.STRIPE_PUBLISHABLE_KEY,
  },

  // Firebase
  firebase: {
    serviceAccountKeyPath: process.env.FIREBASE_SERVICE_ACCOUNT_KEY_PATH,
    projectId: process.env.FIREBASE_PROJECT_ID,
    clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
    privateKey: process.env.FIREBASE_PRIVATE_KEY?.replace(/\\n/g, '\n'),
  },

  // Redis
  redis: {
    host: process.env.REDIS_HOST || 'localhost',
    port: parseInt(process.env.REDIS_PORT || '6379', 10),
    password: process.env.REDIS_PASSWORD || undefined,
    db: parseInt(process.env.REDIS_DB || '0', 10),
  },

  // Rate Limiting
  throttle: {
    ttl: parseInt(process.env.THROTTLE_TTL || '60', 10),
    limit: parseInt(process.env.THROTTLE_LIMIT || '100', 10),
  },

  // Logging
  logging: {
    level: process.env.LOG_LEVEL || 'debug',
  },

  // CORS
  cors: {
    origins: process.env.CORS_ORIGINS?.split(',') || [
      'http://localhost:3000',
      'http://localhost:3002',
    ],
  },
});