import 'dart:convert';
import 'package:http/http.dart' as http;
import '../app_config.dart';
import '../models/address_entry.dart';
import '../models/address_record.dart';
import '../models/auth_session.dart';

abstract class AddressRepository {
  Future<void> saveAddress({
    required AuthSession session,
    required AddressEntry address,
  });

  Future<List<AddressRecord>> getMyAddresses({required AuthSession session});
}

class HttpAddressRepository implements AddressRepository {
  const HttpAddressRepository({http.Client? client}) : _client = client;

  final http.Client? _client;

  @override
  Future<void> saveAddress({
    required AuthSession session,
    required AddressEntry address,
  }) async {
    final uri = Uri.parse('${AppConfig.apiBaseUrl}/addresses');

    late final http.Response response;
    try {
      response = await (_client ?? http.Client()).post(
        uri,
        headers: {
          'Content-Type': 'application/json',
          'Accept': 'application/json',
          'Authorization': 'Bearer ${session.token}',
        },
        body: jsonEncode(address.toJson()),
      );
    } catch (_) {
      throw AddressException(
        'No se pudo conectar con el backend en ${AppConfig.apiBaseUrl}.',
      );
    }

    if (response.statusCode < 200 || response.statusCode >= 300) {
      final payload = jsonDecode(response.body);
      final message = payload['message']?.toString() ?? 'Error al guardar la dirección.';
      throw AddressException(message);
    }
  }

  @override
  Future<List<AddressRecord>> getMyAddresses({required AuthSession session}) async {
    final uri = Uri.parse('${AppConfig.apiBaseUrl}/addresses/me');

    late final http.Response response;
    try {
      response = await (_client ?? http.Client()).get(
        uri,
        headers: {
          'Accept': 'application/json',
          'Authorization': 'Bearer ${session.token}',
        },
      );
    } catch (_) {
      throw AddressException(
        'No se pudo conectar con el backend en ${AppConfig.apiBaseUrl}.',
      );
    }

    if (response.statusCode < 200 || response.statusCode >= 300) {
      final payload = jsonDecode(response.body);
      final message = payload['message']?.toString() ?? 'Error al obtener las direcciones.';
      throw AddressException(message);
    }

    final decoded = jsonDecode(response.body);
    if (decoded is! List) {
      return <AddressRecord>[];
    }

    return decoded
        .whereType<Map<String, dynamic>>()
        .map(AddressRecord.fromJson)
        .toList(growable: false);
  }
}

class AddressException implements Exception {
  AddressException(this.message);
  final String message;

  @override
  String toString() => message;
}