import { Logger } from '../types.js'

export interface OnSignalsOptions {
  logger: Logger
  cleanup?: () => void
}

/**
 * Sets up signal handlers for graceful shutdown.
 *
 * @param options Configuration options
 * @param options.logger Logger instance
 * @param options.cleanup Optional cleanup function to be called before exit
 */
export function onSignals(options: OnSignalsOptions): void {
  const { logger, cleanup } = options

  const handleSignal = (signal: string) => {
    logger.info(`Caught ${signal}. Exiting...`)
    if (cleanup) {
      cleanup()
    }
    process.exit(0)
  }

  process.on('SIGINT', () => handleSignal('SIGINT'))

  process.on('SIGTERM', () => handleSignal('SIGTERM'))

  process.on('SIGHUP', () => handleSignal('SIGHUP'))

  process.stdin.on('close', () => {
    logger.info('stdin closed. Exiting...')
    if (cleanup) {
      cleanup()
    }
    process.exit(0)
  })
}