TREK/client/src/native/trekShell.ts

import { registerPlugin } from '@capacitor/core';
import type { NativeCapabilities } from './capabilities';

/**
 * The app's own native plugin, implemented in
 * ios/App/App/TrekShellPlugin.swift and
 * android/app/src/main/java/com/liketrek/trek/TrekShellPlugin.java.
 *
 * The app is a frame around the UI the user's server delivers, so what the
 * web side needs from it is small: which server that is, a way to change it,
 * a system browser for the sign-ins a WebView cannot do, and on iOS the
 * offline copy of the start page that stands in for the missing service
 * worker.
 */
export interface TrekShellPlugin {
  getServer(): Promise<{ url: string | null }>;
  /** Remembers the server and loads it. The current page is gone afterwards. */
  setServer(options: { url: string }): Promise<void>;
  /** Forgets the server and returns to the address screen. */
  resetServer(): Promise<void>;
  /** Loads the remembered server again, after it could not be reached. */
  reload(): Promise<void>;
  /**
   * Opens `url` in the system browser and resolves with the URL it was sent
   * back to under `callbackScheme`. Rejects with code `CANCELLED` when the
   * user closes the browser.
   */
  authenticate(options: { url: string; callbackScheme: string }): Promise<{ url: string }>;
  /** iOS: stores the server's start page for a cold start without network. */
  refreshOfflineCopy(): Promise<{ saved: boolean }>;
  /** iOS: loads that copy under the server's origin. False when there is none. */
  openOfflineCopy(): Promise<{ opened: boolean }>;
  /** What this binary offers the UI (native/capabilities.ts). Missing before shell API 2. */
  getCapabilities(): Promise<NativeCapabilities>;
  /** Feature tileCache: what the map tile store takes on disk, and its limit (iOS: every map; Android: Mapbox's). */
  getTileCacheUsage(): Promise<{ bytes: number; limit: number }>;
  /** Feature tileCache: empties the map tile store. */
  clearTileCache(): Promise<void>;
  /** Feature biometricLock: which biometry the device offers for the app lock. */
  biometryInfo(): Promise<{ available: boolean; type: string }>;
  /** Feature biometricLock: Face ID, Touch ID or the passcode. Rejects with CANCELLED or FAILED. */
  authenticateBiometric(options: { reason: string }): Promise<{ ok: true }>;
  /** Feature biometricLock: a blurred cover in the app switcher while the lock is on. */
  setPrivacyCover(options: { enabled: boolean }): Promise<void>;
  /** Feature geolocation: starts the native location stream (the "location" event). */
  startLocation(options: { highAccuracy: boolean }): Promise<void>;
  stopLocation(): Promise<void>;
  addListener(
    event: 'location',
    listener: (payload: NativeLocationPayload) => void
  ): Promise<{ remove: () => Promise<void> }>;
  addListener(
    event: 'sharedFile',
    listener: (payload: SharedFilePayload) => void
  ): Promise<{ remove: () => Promise<void> }>;
  /** Feature sharedFiles: the booking document shared to TREK before the UI ran. */
  takeSharedFile(): Promise<{ file: SharedFilePayload | null }>;
  /** Feature nativePush: permission, APNs and the device keys, as a Web Push subscription. Rejects with DENIED. */
  registerPush(): Promise<{ endpoint: string; keys: { p256dh: string; auth: string } }>;
  /** Feature nativePush: the notification the app was opened from, before the UI ran. */
  takeOpenedPush(): Promise<{ url: string | null }>;
  /** Feature widgets: what the home-screen widget shows (native/widgets.ts), as JSON. */
  /** Feature widgetTrips adds `key`: "trip.<id>" for one trip's snapshot, "trips" for the list a widget picks from. */
  setWidgetSnapshot(options: { json: string; key?: string }): Promise<void>;
  /** Feature liveActivity: starts the travel day's Live Activity, or updates the running one. */
  syncTripDay(options: {
    tripTitle: string;
    path: string;
    dayLabel: string;
    nextName: string;
    nextTime?: string;
    done: number;
    total: number;
    /** Android: minutes after midnight of the next stop, for the countdown in the Live Update. */
    nextMinutes?: number;
    /** Android: each stop's colour (#rrggbb) for the Live Update's segments. */
    colors?: (string | null)[];
  }): Promise<{ running: boolean }>;
  endTripDay(): Promise<void>;
  /** Feature storeKit (iOS) or playBilling (Android): the store's price strings for the products it knows. */
  storeProducts(options: {
    ids: string[];
  }): Promise<{ products: { id: string; displayPrice: string }[]; sandbox?: boolean }>;
  /**
   * The purchase sheet. Set when bought: on iOS `jws`, the signed transaction; on
   * Android `purchaseToken`, which the control plane verifies with Google Play.
   */
  storePurchase(options: { productId: string }): Promise<{
    kind: 'bought' | 'cancelled' | 'pending' | 'failed';
    jws?: string;
    purchaseToken?: string;
    productId?: string;
    transactionId?: string;
  }>;
  /** Marks a purchase delivered once its instance exists (Android: acknowledges it with Google Play). */
  storeFinish(options: { transactionId: string }): Promise<void>;
  /** iOS, feature wallet: adds a .pkpass (base64) to Apple Wallet, or opens it there when it is already in. */
  addToWallet(options: { data: string }): Promise<{ result: 'added' | 'opened' | 'cancelled' }>;
  /** The newest active subscription under `prefix` on this Apple ID or Google account, if any. */
  storeRestore(options: {
    prefix: string;
  }): Promise<{ jws?: string; purchaseToken?: string; productId?: string; transactionId?: string }>;
  /** Android, feature googleWallet: opens a Google Wallet save link (https://pay.google.com/gp/v/save/...). */
  addToGoogleWallet(options: { url: string }): Promise<{ result: 'opened' }>;
  /** Android, feature windowLayout: the window's size classes and a foldable's posture and hinge. */
  getWindowLayout(): Promise<NativeWindowLayout>;
  addListener(
    event: 'windowLayout',
    listener: (payload: NativeWindowLayout) => void
  ): Promise<{ remove: () => Promise<void> }>;
  addListener(
    event: 'pushOpened',
    listener: (payload: { url: string }) => void
  ): Promise<{ remove: () => Promise<void> }>;
}

/** A document shared to TREK, as the native side reads it. */
export interface SharedFilePayload {
  name: string;
  mimeType: string;
  /** base64 */
  data: string;
  /** Set when the share sheet already asked which trip it belongs to (feature shareSheet). */
  tripId?: number;
}

/**
 * The window as the Android app sees it (feature windowLayout): its size in CSS
 * pixels, Android's size classes, and a foldable's posture with the hinge's
 * place in the window. `posture` is none on a device without a fold.
 */
interface NativeWindowLayout {
  width: number;
  height: number;
  widthClass: 'compact' | 'medium' | 'expanded';
  heightClass: 'compact' | 'medium' | 'expanded';
  posture: 'none' | 'flat' | 'halfOpened';
  orientation?: 'vertical' | 'horizontal';
  separating?: boolean;
  occluding?: boolean;
  hinge?: { left: number; top: number; right: number; bottom: number };
}

/** A position, or an error shaped like GeolocationPositionError (1 denied, 2 unavailable). */
export type NativeLocationPayload =
  | {
      latitude: number;
      longitude: number;
      accuracy: number;
      altitude: number | null;
      speed: number | null;
      heading: number | null;
      timestamp: number;
      error?: undefined;
    }
  | { error: { code: number; message: string } };

export const TrekShell = registerPlugin<TrekShellPlugin>('TrekShell');

export const APP_URL_SCHEME = 'com.liketrek.trek';

/**
 * True for the rejection Capacitor gives when the installed app has no such
 * native method: the UI comes from the server, so a newer server can call into
 * an app binary that predates the method.
 */
export function isUnimplemented(err: unknown): boolean {
  return typeof err === 'object' && err !== null && (err as { code?: unknown }).code === 'UNIMPLEMENTED';
}