/**
 * Maps host SIGINT into a process event for guest cancellation (optional `bare-signals` on Bare).
 */

/**
 * @param {{ onSigint?: () => void }} [opts]
 * @returns {Promise<() => void>} disposer
 */
export async function installBareOsHostSignalsBridge(opts = {}) {
  const onSigint = typeof opts.onSigint === 'function' ? opts.onSigint : () => {}
  /** @type {(() => void)[]} */
  const disposers = []
  try {
    const mod = await import('bare-signals')
    const Signal = mod.default
    if (typeof Signal === 'function') {
      const h = new Signal('SIGINT')
      const fn = () => {
        onSigint()
      }
      h.on('signal', fn)
      h.start()
      disposers.push(() => {
        try {
          void h.close()
        } catch {
          /* ignore */
        }
      })
    }
  } catch {
    /* bare-signals optional (native binding) */
  }
  if (
    disposers.length === 0 &&
    globalThis.process &&
    typeof globalThis.process.on === 'function'
  ) {
    const fn = () => {
      onSigint()
    }
    globalThis.process.on('SIGINT', fn)
    disposers.push(() => {
      try {
        globalThis.process.off('SIGINT', fn)
      } catch {
        /* ignore */
      }
    })
  }
  return () => {
    for (const d of disposers) {
      try {
        d()
      } catch {
        /* ignore */
      }
    }
  }
}