social-app/apps/lib/features/friends/data/friends_api.dart

import 'package:social_app/core/api/i_api_client.dart';

class FriendsApi {
  final IApiClient _client;
  static const _prefix = '/api/v1/friends';

  FriendsApi(this._client);

  Future<List<FriendResponse>> getFriends() async {
    final response = await _client.get(_prefix);
    final List<dynamic> data = response.data;
    return data.map((json) => FriendResponse.fromJson(json)).toList();
  }

  Future<List<FriendResponse>> getIncomingRequests() async {
    final response = await _client.get('$_prefix/requests/inbox');
    final List<dynamic> data = response.data;
    return data.map((json) => FriendResponse.fromJson(json)).toList();
  }

  Future<List<FriendResponse>> getOutgoingRequests() async {
    final response = await _client.get('$_prefix/requests/outgoing');
    final List<dynamic> data = response.data;
    return data.map((json) => FriendResponse.fromJson(json)).toList();
  }

  Future<FriendResponse> sendRequest(String targetUserId) async {
    final response = await _client.post(
      '$_prefix/requests',
      data: {'target_user_id': targetUserId},
    );
    return FriendResponse.fromJson(response.data);
  }

  Future<FriendResponse> acceptRequest(String friendshipId) async {
    final response = await _client.post(
      '$_prefix/requests/$friendshipId/accept',
    );
    return FriendResponse.fromJson(response.data);
  }

  Future<FriendResponse> declineRequest(String friendshipId) async {
    final response = await _client.post(
      '$_prefix/requests/$friendshipId/decline',
    );
    return FriendResponse.fromJson(response.data);
  }

  Future<void> removeFriend(String friendshipId) async {
    await _client.delete('$_prefix/$friendshipId');
  }
}

class FriendResponse {
  final String id;
  final UserBasicInfo friend;
  final String status;
  final DateTime createdAt;
  final DateTime? acceptedAt;

  FriendResponse({
    required this.id,
    required this.friend,
    required this.status,
    required this.createdAt,
    this.acceptedAt,
  });

  factory FriendResponse.fromJson(Map<String, dynamic> json) {
    return FriendResponse(
      id: json['id'] as String,
      friend: UserBasicInfo.fromJson(json['friend'] as Map<String, dynamic>),
      status: json['status'] as String,
      createdAt: DateTime.parse(json['created_at'] as String),
      acceptedAt: json['accepted_at'] != null
          ? DateTime.parse(json['accepted_at'] as String)
          : null,
    );
  }
}

class UserBasicInfo {
  final String id;
  final String username;
  final String? avatarUrl;

  UserBasicInfo({required this.id, required this.username, this.avatarUrl});

  factory UserBasicInfo.fromJson(Map<String, dynamic> json) {
    return UserBasicInfo(
      id: json['id'] as String,
      username: json['username'] as String,
      avatarUrl: json['avatar_url'] as String?,
    );
  }
}