/**
 * Permissions Utility
 * Handle camera, location, and storage permissions
 */

import { Platform, PermissionsAndroid } from 'react-native';
import { check, request, PERMISSIONS, RESULTS } from 'react-native-permissions';

/**
 * Request camera permission
 */
export async function requestCameraPermission() {
  if (Platform.OS === 'ios') {
    const result = await check(PERMISSIONS.IOS.CAMERA);
    if (result === RESULTS.DENIED) {
      return await request(PERMISSIONS.IOS.CAMERA);
    }
    return result;
  } else {
    const result = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.CAMERA,
      {
        title: 'Camera Permission',
        message: 'quiXzoom needs camera access to capture observations.',
        buttonPositive: 'Allow',
        buttonNegative: 'Deny',
      }
    );
    return result === PermissionsAndroid.RESULTS.GRANTED ? RESULTS.GRANTED : RESULTS.DENIED;
  }
}

/**
 * Request location permission
 */
export async function requestLocationPermission() {
  if (Platform.OS === 'ios') {
    const result = await check(PERMISSIONS.IOS.LOCATION_WHEN_IN_USE);
    if (result === RESULTS.DENIED) {
      return await request(PERMISSIONS.IOS.LOCATION_WHEN_IN_USE);
    }
    return result;
  } else {
    const result = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
      {
        title: 'Location Permission',
        message: 'quiXzoom needs location access to tag observations with GPS.',
        buttonPositive: 'Allow',
        buttonNegative: 'Deny',
      }
    );
    return result === PermissionsAndroid.RESULTS.GRANTED ? RESULTS.GRANTED : RESULTS.DENIED;
  }
}

/**
 * Request storage permission
 */
export async function requestStoragePermission() {
  if (Platform.OS === 'ios') {
    const result = await check(PERMISSIONS.IOS.PHOTO_LIBRARY);
    if (result === RESULTS.DENIED) {
      return await request(PERMISSIONS.IOS.PHOTO_LIBRARY);
    }
    return result;
  } else {
    const result = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE,
      {
        title: 'Storage Permission',
        message: 'quiXzoom needs storage access to save observations.',
        buttonPositive: 'Allow',
        buttonNegative: 'Deny',
      }
    );
    return result === PermissionsAndroid.RESULTS.GRANTED ? RESULTS.GRANTED : RESULTS.DENIED;
  }
}

/**
 * Request all required permissions
 */
export async function requestAllPermissions() {
  const results = await Promise.all([
    requestCameraPermission(),
    requestLocationPermission(),
    requestStoragePermission(),
  ]);

  return {
    camera: results[0],
    location: results[1],
    storage: results[2],
    allGranted: results.every(r => r === RESULTS.GRANTED),
  };
}

/**
 * Check if all permissions are granted
 */
export async function checkPermissions() {
  if (Platform.OS === 'ios') {
    const [camera, location, storage] = await Promise.all([
      check(PERMISSIONS.IOS.CAMERA),
      check(PERMISSIONS.IOS.LOCATION_WHEN_IN_USE),
      check(PERMISSIONS.IOS.PHOTO_LIBRARY),
    ]);
    return {
      camera,
      location,
      storage,
      allGranted: camera === RESULTS.GRANTED && location === RESULTS.GRANTED && storage === RESULTS.GRANTED,
    };
  } else {
    const [camera, location, storage] = await Promise.all([
      PermissionsAndroid.check(PermissionsAndroid.PERMISSIONS.CAMERA),
      PermissionsAndroid.check(PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION),
      PermissionsAndroid.check(PermissionsAndroid.PERMISSIONS.READ_EXTERNAL_STORAGE),
    ]);
    return {
      camera: camera ? RESULTS.GRANTED : RESULTS.DENIED,
      location: location ? RESULTS.GRANTED : RESULTS.DENIED,
      storage: storage ? RESULTS.GRANTED : RESULTS.DENIED,
      allGranted: camera && location && storage,
    };
  }
}