import * as ImagePicker from 'expo-image-picker';

export interface PickedImage {
  uri: string;
  mimeType: string;
  sizeBytes: number;
  width: number;
  height: number;
}

// Pick an image from the photo library. Requests permission on demand;
// returns null on cancel / denial.
export async function pickFromLibrary(): Promise<PickedImage | null> {
  const perm = await ImagePicker.requestMediaLibraryPermissionsAsync();
  if (!perm.granted) return null;
  const res = await ImagePicker.launchImageLibraryAsync({
    mediaTypes: ImagePicker.MediaTypeOptions.Images,
    quality: 0.85,
    base64: false,
    exif: false,
  });
  if (res.canceled || res.assets.length === 0) return null;
  return toPicked(res.assets[0]!);
}

// Capture an image via the device camera. Same return shape as
// pickFromLibrary so call sites can stay shape-agnostic.
export async function captureFromCamera(): Promise<PickedImage | null> {
  const perm = await ImagePicker.requestCameraPermissionsAsync();
  if (!perm.granted) return null;
  const res = await ImagePicker.launchCameraAsync({
    quality: 0.85,
    base64: false,
    exif: false,
  });
  if (res.canceled || res.assets.length === 0) return null;
  return toPicked(res.assets[0]!);
}

function toPicked(asset: ImagePicker.ImagePickerAsset): PickedImage {
  return {
    uri: asset.uri,
    mimeType: asset.mimeType ?? 'image/jpeg',
    sizeBytes: asset.fileSize ?? 0,
    width: asset.width,
    height: asset.height,
  };
}