import 'dart:convert';

import 'package:http/http.dart' as http;

class AppNotification {
  const AppNotification({
    required this.id,
    required this.type,
    required this.title,
    required this.body,
    required this.createdAt,
    this.resourceType,
    this.resourceId,
    this.readAt,
  });

  final String id;
  final String type;
  final String title;
  final String body;
  final String? resourceType;
  final String? resourceId;
  final DateTime createdAt;
  final DateTime? readAt;

  bool get isRead => readAt != null;

  factory AppNotification.fromJson(Map<String, Object?> json) =>
      AppNotification(
        id: json['id']! as String,
        type: json['type']! as String,
        title: json['title']! as String,
        body: json['body']! as String,
        resourceType: json['resourceType'] as String?,
        resourceId: json['resourceId'] as String?,
        createdAt: DateTime.parse(json['createdAt']! as String),
        readAt: json['readAt'] == null
            ? null
            : DateTime.parse(json['readAt']! as String),
      );
}

class NotificationRepository {
  NotificationRepository({
    http.Client? client,
    this.baseUrl = const String.fromEnvironment(
      'AIOA_API_BASE_URL',
      defaultValue: 'http://127.0.0.1:8080/api/v1',
    ),
    this.accessToken = const String.fromEnvironment('AIOA_ACCESS_TOKEN'),
  }) : _client = client ?? http.Client();

  final http.Client _client;
  final String baseUrl;
  final String accessToken;

  Future<List<AppNotification>> list() async {
    final response = await _client.get(
      Uri.parse('$baseUrl/notifications'),
      headers: _headers,
    );
    _requireSuccess(response);
    return (jsonDecode(response.body) as List)
        .map(
          (item) =>
              AppNotification.fromJson(Map<String, Object?>.from(item as Map)),
        )
        .toList();
  }

  Future<AppNotification> markRead(String id) async {
    final response = await _client.post(
      Uri.parse('$baseUrl/notifications/$id/read'),
      headers: _headers,
    );
    _requireSuccess(response);
    return AppNotification.fromJson(
      jsonDecode(response.body) as Map<String, Object?>,
    );
  }

  Map<String, String> get _headers => {
    'Accept': 'application/json',
    if (accessToken.isNotEmpty) 'Authorization': 'Bearer $accessToken',
  };

  void _requireSuccess(http.Response response) {
    if (response.statusCode >= 200 && response.statusCode < 300) return;
    throw Exception('通知请求失败（${response.statusCode}）');
  }
}