Genarrative/apps/mobile-shell/src/host-bridge/haptics.ts

import * as Haptics from 'expo-haptics';

import {
  type HapticsImpactPayload,
  type HostBridgeError,
  type HostBridgeHapticsImpactStyle,
  type HostBridgeRequest,
  normalizeHostBridgeHapticsImpactStyle,
} from '../../../../packages/shared/src/contracts/hostBridge';
import { invalidRequest, ok } from './protocol';

function toExpoImpactStyle(style: HostBridgeHapticsImpactStyle) {
  return style === 'heavy'
    ? Haptics.ImpactFeedbackStyle.Heavy
    : style === 'medium'
      ? Haptics.ImpactFeedbackStyle.Medium
      : Haptics.ImpactFeedbackStyle.Light;
}

function logMobileHapticsFailure(label: string, _error: unknown) {
  console.warn(`mobile haptics failed for ${label}`);
}

export async function runMobileHapticsImpact(rawStyle: unknown) {
  const style = normalizeHostBridgeHapticsImpactStyle(rawStyle);
  if (!style) {
    return false;
  }

  try {
    await Haptics.impactAsync(toExpoImpactStyle(style));
  } catch (error) {
    logMobileHapticsFailure('impact.dispatch', error);
    throw {
      code: 'host_error',
      message: 'haptics impact unavailable',
    } satisfies HostBridgeError;
  }
  return true;
}

export async function runMobileHostBridgeHapticsImpact(
  request: HostBridgeRequest,
) {
  const style = (request.payload as HapticsImpactPayload | undefined)?.style;
  if (!(await runMobileHapticsImpact(style))) {
    throw invalidRequest(
      'haptics impact style must be light, medium, or heavy',
    );
  }

  return ok(request, true);
}