import 'dart:convert';

import 'package:please_pay_me/data/models/json.dart';

class AuthUser {
  const AuthUser({
    required this.userId,
    this.firstName,
    this.lastName,
    this.username,
    this.photoUrl,
  });

  factory AuthUser.fromJson(Map<String, dynamic> json) {
    return AuthUser(
      userId: asInt(json['user_id']),
      firstName: asStringOrNull(json['first_name']),
      lastName: asStringOrNull(json['last_name']),
      username: asStringOrNull(json['username']),
      photoUrl: asStringOrNull(json['photo_url']),
    );
  }

  static AuthUser? tryDecode(String? raw) {
    if (raw == null || raw.isEmpty) return null;
    try {
      return AuthUser.fromJson(asMap(jsonDecode(raw)));
    } on FormatException {
      return null;
    }
  }

  final int userId;
  final String? firstName;
  final String? lastName;
  final String? username;
  final String? photoUrl;

  String get displayName {
    final full = [firstName, lastName].whereType<String>().join(' ').trim();
    if (full.isNotEmpty) return full;
    if (username != null) return '@$username';
    return 'Пользователь $userId';
  }

  String get handle => username != null ? '@$username' : 'id $userId';

  String get initials {
    final source = firstName?.trim().isNotEmpty == true
        ? firstName!.trim()
        : username?.trim() ?? '';
    if (source.isEmpty) return '';
    return source.substring(0, 1);
  }

  Map<String, dynamic> toJson() => {
        'user_id': userId,
        'first_name': firstName,
        'last_name': lastName,
        'username': username,
        'photo_url': photoUrl,
      };

  String encode() => jsonEncode(toJson());
}

class AuthSession {
  const AuthSession({required this.accessToken, required this.user});

  factory AuthSession.fromJson(Map<String, dynamic> json) {
    return AuthSession(
      accessToken: asString(json['access_token']),
      user: AuthUser.fromJson(asMap(json['user'])),
    );
  }

  final String accessToken;
  final AuthUser user;
}