import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:permission_handler/permission_handler.dart';

import '../services/permission_service.dart';

/// Helpers for requesting and checking the platform location permission.
///
/// Mirrors the pattern in [notification_permission.dart] so that location
/// can be requested at app launch and before location-dependent actions.

Future<PermissionStatus> requestLocationPermission() async {
  if (kIsWeb) {
    return PermissionStatus.granted;
  }
  return requestPermission(Permission.location);
}

/// Ensures location permission is granted. Returns `true` if granted.
///
/// Call on app launch and before check-in, check-out, or toggling location
/// tracking so the user always has the opportunity to grant permission.
Future<bool> ensureLocationPermission() async {
  if (kIsWeb) return true;
  final status = await Permission.location.status;
  if (status.isGranted) return true;
  if (status.isDenied || status.isRestricted || status.isLimited) {
    final newStatus = await requestLocationPermission();
    return newStatus.isGranted;
  }
  // permanently denied – send user to settings so they can enable it
  await openAppSettings();
  return false;
}

/// Ensures "Allow all the time" (background) location permission is granted.
///
/// This is required for `background_locator_2` to track location when the app
/// is backgrounded or killed. On Android 10+ this triggers the system prompt
/// for `ACCESS_BACKGROUND_LOCATION`. Must be called **after** the foreground
/// location permission (`Permission.location`) has been granted.
Future<bool> ensureBackgroundLocationPermission() async {
  if (kIsWeb) return true;

  // Foreground location must be granted first; this helper already opens
  // settings if the user permanently denied the fine/coarse prompt.
  final fgGranted = await ensureLocationPermission();
  if (!fgGranted) return false;

  final bgStatus = await Permission.locationAlways.status;
  if (bgStatus.isGranted) return true;

  if (bgStatus.isDenied || bgStatus.isRestricted || bgStatus.isLimited) {
    final newStatus = await Permission.locationAlways.request();
    if (newStatus.isGranted) return true;
    if (newStatus.isPermanentlyDenied) {
      // user chose "Don't ask again" – send them to settings
      await openAppSettings();
    }
    return false;
  }

  // Permanently denied – user must open settings
  await openAppSettings();
  return false;
}