import { requireOptionalNativeModule } from "expo-modules-core";

import type * as ImagePickerModule from "expo-image-picker";

export type ImagePickerApi = typeof ImagePickerModule;

/** The native module expo-image-picker is a JS wrapper around. */
const NATIVE_MODULE = "ExponentImagePicker";

/**
 * Whether photo capture can work at all in this build.
 *
 * `requireOptionalNativeModule` is the non-throwing twin of the
 * `requireNativeModule` call that expo-image-picker makes as it loads: it
 * returns null instead of raising `Cannot find native module
 * 'ExponentImagePicker'`. Asking first means the error is never constructed,
 * never logged, and never has a chance to escape into a driver's face — which
 * beats importing the package and catching the throw, because a throw that
 * happens while a module is evaluating can surface in places a try/catch
 * around the import does not cover.
 *
 * expo-modules-core itself is part of every Expo binary, so importing it here
 * is safe on exactly the old builds this is guarding against.
 */
export const isImagePickerAvailable = (): boolean =>
  requireOptionalNativeModule(NATIVE_MODULE) !== null;

/**
 * Loads expo-image-picker, or returns null when this binary predates it.
 *
 * The package resolves its native counterpart at *import* time, so importing
 * it at the top of a screen doesn't fail politely at the camera button: it
 * fails while the route tree is being built, taking the whole app down —
 * riders included — on any build made before the package was added. Deferring
 * the require moves that failure to the one tap that needs it and makes it
 * recoverable.
 *
 * A null return means one thing only: the app needs rebuilding. Photo capture
 * genuinely requires the native module; nothing here can substitute for it.
 */
let cached: ImagePickerApi | null = null;

export const loadImagePicker = (): ImagePickerApi | null => {
  if (cached) return cached;
  if (!isImagePickerAvailable()) return null;

  try {
    // Static string so Metro still bundles it — only the evaluation is
    // deferred, not the packaging.
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    cached = require("expo-image-picker") as ImagePickerApi;
    return cached;
  } catch (error) {
    console.log("[IMAGE_PICKER_UNAVAILABLE]: ", error);
    return null;
  }
};