import { Platform } from 'react-native';

import {
  coalesceExpirations,
  coalesceStatuses,
  coalesceCanAskAgain,
  coalesceGranted,
} from './CoalescedPermissions';
import Permissions from './ExpoPermissions';
import {
  PermissionResponse,
  PermissionType,
  PermissionMap,
  PermissionStatus,
  PermissionExpiration,
  PermissionInfo,
} from './Permissions.types';

export {
  PermissionStatus,
  PermissionResponse,
  PermissionExpiration,
  PermissionMap,
  PermissionInfo,
  PermissionType,
};

export const CAMERA = 'camera';
export const MEDIA_LIBRARY = 'mediaLibrary';
export const MEDIA_LIBRARY_WRITE_ONLY = 'mediaLibraryWriteOnly';
/**
 * @deprecated Use `MEDIA_LIBRARY` or `MEDIA_LIBRARY_WRITE_ONLY`
 */
export const CAMERA_ROLL = MEDIA_LIBRARY;
export const AUDIO_RECORDING = 'audioRecording';
/** @deprecated Use `LOCATION_FOREGROUND` or `LOCATION_BACKGROUND` instead */
export const LOCATION = 'location';
export const LOCATION_FOREGROUND = 'locationForeground';
export const LOCATION_BACKGROUND = 'locationBackground';
export const USER_FACING_NOTIFICATIONS = 'userFacingNotifications';
export const NOTIFICATIONS = 'notifications';
export const CONTACTS = 'contacts';
export const CALENDAR = 'calendar';
export const REMINDERS = 'reminders';
export const SYSTEM_BRIGHTNESS = 'systemBrightness';
export const MOTION = 'motion';

// Map corresponding permission to correct package
const PERMISSION_MODULE_MAPPING = {
  [CAMERA]: 'expo-camera',
  [CAMERA_ROLL]: 'expo-media-library',
  [MEDIA_LIBRARY]: 'expo-media-library',
  [MEDIA_LIBRARY_WRITE_ONLY]: 'expo-media-library',
  [AUDIO_RECORDING]: 'expo-av',
  [LOCATION]: 'expo-location',
  [USER_FACING_NOTIFICATIONS]: 'expo-notifications',
  [NOTIFICATIONS]: 'expo-notifications',
  [CONTACTS]: 'expo-contacts',
  [CALENDAR]: 'expo-calendar',
  [REMINDERS]: 'expo-calendar',
  [SYSTEM_BRIGHTNESS]: 'expo-brightness',
  [MOTION]: 'expo-sensors',
};

export async function getAsync(...types: PermissionType[]): Promise<PermissionResponse> {
  console.warn(
    `expo-permissions is now deprecated — the functionality has been moved to other expo packages that directly use these permissions (e.g. expo-location, expo-camera). The package will be removed in the upcoming releases.`
  );

  if (Platform.OS === 'ios') {
    return await _handleMultiPermissionsRequestIOSAsync(types, Permissions.getAsync);
  }
  return await _handlePermissionsRequestAsync(types, Permissions.getAsync);
}

export async function askAsync(...types: PermissionType[]): Promise<PermissionResponse> {
  console.warn(
    `expo-permissions is now deprecated — the functionality has been moved to other expo packages that directly use these permissions (e.g. expo-location, expo-camera). The package will be removed in the upcoming releases.`
  );

  if (Platform.OS === 'ios') {
    return await _handleMultiPermissionsRequestIOSAsync(types, Permissions.askAsync);
  }
  return await _handlePermissionsRequestAsync(types, Permissions.askAsync);
}

async function _handleSinglePermissionRequestIOSAsync(
  type: PermissionType,
  handlePermission: (type: PermissionType) => Promise<PermissionInfo>
): Promise<PermissionInfo> {
  if (Platform.OS !== 'web' && type === 'motion') {
    return {
      status: PermissionStatus.GRANTED,
      expires: 'never',
      granted: true,
      canAskAgain: true,
    };
  }
  try {
    return await handlePermission(type);
  } catch (error) {
    // We recognize the permission's library, so we inform the user to link that library to request the permission.
    if (error.code === 'E_PERMISSIONS_UNKNOWN' && PERMISSION_MODULE_MAPPING[type]) {
      const library = PERMISSION_MODULE_MAPPING[type];
      error.message = `${error.message}, please install and link the package ${PERMISSION_MODULE_MAPPING[type]}, see more at https://github.com/expo/expo/tree/master/packages/${library}`;
    }
    throw error;
  }
}

async function _handleMultiPermissionsRequestIOSAsync(
  types: PermissionType[],
  handlePermission: (type: PermissionType) => Promise<PermissionInfo>
): Promise<PermissionResponse> {
  if (!types.length) {
    throw new Error('At least one permission type must be specified');
  }

  const permissions = {};
  for (const type of types) {
    permissions[type] = await _handleSinglePermissionRequestIOSAsync(type, handlePermission);
  }

  return {
    status: coalesceStatuses(permissions),
    expires: coalesceExpirations(permissions),
    canAskAgain: coalesceCanAskAgain(permissions),
    granted: coalesceGranted(permissions),
    permissions,
  };
}

async function _handlePermissionsRequestAsync(
  types: PermissionType[],
  handlePermissions: (types: PermissionType[]) => Promise<PermissionMap>
): Promise<PermissionResponse> {
  if (!types.length) {
    throw new Error('At least one permission type must be specified');
  }

  if (Platform.OS !== 'web' && types.length === 1 && types[0] === 'motion') {
    const approvedPermission = {
      status: PermissionStatus.GRANTED,
      expires: 'never',
      granted: true,
      canAskAgain: true,
    };
    return {
      ...approvedPermission,
      // @ts-ignore
      permissions: { motion: approvedPermission },
    };
  }

  const permissions = await handlePermissions(types);
  return {
    status: coalesceStatuses(permissions),
    expires: coalesceExpirations(permissions),
    canAskAgain: coalesceCanAskAgain(permissions),
    granted: coalesceGranted(permissions),
    permissions,
  };
}