/**
 * MongoDB configuration using envalid
 * Document storage for sentiment data, raw documents, and unstructured data
 */
import { cleanEnv, str, port, bool, num } from 'envalid';

/**
 * MongoDB configuration with validation and defaults
 */
export const mongodbConfig = cleanEnv(process.env, {
  // MongoDB Connection
  MONGODB_HOST: str({ default: 'localhost', desc: 'MongoDB host' }),
  MONGODB_PORT: port({ default: 27017, desc: 'MongoDB port' }),
  MONGODB_DATABASE: str({ default: 'trading_documents', desc: 'MongoDB database name' }),
  
  // Authentication
  MONGODB_USERNAME: str({ default: 'trading_admin', desc: 'MongoDB username' }),
  MONGODB_PASSWORD: str({ default: '', desc: 'MongoDB password' }),
  MONGODB_AUTH_SOURCE: str({ default: 'admin', desc: 'MongoDB authentication database' }),
  
  // Connection URI (alternative to individual settings)
  MONGODB_URI: str({ default: '', desc: 'Complete MongoDB connection URI (overrides individual settings)' }),
  
  // Connection Pool Settings
  MONGODB_MAX_POOL_SIZE: num({ default: 10, desc: 'Maximum connection pool size' }),
  MONGODB_MIN_POOL_SIZE: num({ default: 0, desc: 'Minimum connection pool size' }),
  MONGODB_MAX_IDLE_TIME: num({ default: 30000, desc: 'Maximum idle time for connections in ms' }),
  
  // Timeouts
  MONGODB_CONNECT_TIMEOUT: num({ default: 10000, desc: 'Connection timeout in ms' }),
  MONGODB_SOCKET_TIMEOUT: num({ default: 30000, desc: 'Socket timeout in ms' }),
  MONGODB_SERVER_SELECTION_TIMEOUT: num({ default: 5000, desc: 'Server selection timeout in ms' }),
  
  // SSL/TLS Settings
  MONGODB_TLS: bool({ default: false, desc: 'Enable TLS for MongoDB connection' }),
  MONGODB_TLS_INSECURE: bool({ default: false, desc: 'Allow invalid certificates in TLS mode' }),
  MONGODB_TLS_CA_FILE: str({ default: '', desc: 'Path to TLS CA certificate file' }),
  
  // Additional Settings
  MONGODB_RETRY_WRITES: bool({ default: true, desc: 'Enable retryable writes' }),
  MONGODB_JOURNAL: bool({ default: true, desc: 'Enable write concern journal' }),
  MONGODB_READ_PREFERENCE: str({ 
    default: 'primary', 
    choices: ['primary', 'primaryPreferred', 'secondary', 'secondaryPreferred', 'nearest'],
    desc: 'MongoDB read preference' 
  }),
  MONGODB_WRITE_CONCERN: str({ default: 'majority', desc: 'Write concern level' }),
});

// Export typed configuration object
export type MongoDbConfig = typeof mongodbConfig;

// Export individual config values for convenience
export const {
  MONGODB_HOST,
  MONGODB_PORT,
  MONGODB_DATABASE,
  MONGODB_USERNAME,
  MONGODB_PASSWORD,
  MONGODB_AUTH_SOURCE,
  MONGODB_URI,
  MONGODB_MAX_POOL_SIZE,
  MONGODB_MIN_POOL_SIZE,
  MONGODB_MAX_IDLE_TIME,
  MONGODB_CONNECT_TIMEOUT,
  MONGODB_SOCKET_TIMEOUT,
  MONGODB_SERVER_SELECTION_TIMEOUT,
  MONGODB_TLS,
  MONGODB_TLS_INSECURE,
  MONGODB_TLS_CA_FILE,
  MONGODB_RETRY_WRITES,
  MONGODB_JOURNAL,
  MONGODB_READ_PREFERENCE,
  MONGODB_WRITE_CONCERN,
} = mongodbConfig;