import 'package:flutter/foundation.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

import '../storage/storage_keys.dart';
import '../storage/storage_service.dart';
import '../widgets/notification_permission_tip.dart';

abstract final class NotificationPermission {
  static Future<bool> isGranted() async =>
      !kIsWeb && (await Permission.notification.status).isGranted;

  /// 对齐研听：Android 13+ 由应用解释后主动申请；iOS 由 U-Push 注册 APNs
  /// 时触发系统授权，绝不展示 Android 的自定义顶部提示。
  static Future<bool> requestIfNeeded(BuildContext context) async {
    if (kIsWeb || defaultTargetPlatform != TargetPlatform.android) {
      return isGranted();
    }
    final android = await DeviceInfoPlugin().androidInfo;
    if (android.version.sdkInt < 33 ||
        StorageService.to.getBool(storagePushPermissionPrompted)) {
      return isGranted();
    }
    if (await isGranted() || !context.mounted) return true;
    await showNotificationPermissionTip(context);
    await StorageService.to.setBool(storagePushPermissionPrompted, true);
    return (await Permission.notification.request()).isGranted;
  }

  /// 设置页不使用顶部说明；iOS/Android 都直接请求系统授权。
  static Future<bool> requestFromSettings() async {
    if (kIsWeb) return false;
    final current = await Permission.notification.status;
    if (current.isGranted) return true;
    await StorageService.to.setBool(storagePushPermissionPrompted, true);
    return (await Permission.notification.request()).isGranted;
  }

  static Future<bool> openSystemSettings() => openAppSettings();
}