import 'package:dio/dio.dart';

import '../../domain/wallet/wallet.dart';

/// Hitung mundur bawaan bila server menjawab `429` tanpa header `Retry-After`.
const int kDefaultOtpRetrySeconds = 60;

/// Membaca envelope `{ success, data, errors }`. Mengembalikan `null` bila
/// sukses, atau [WalletFailure] yang sesuai bila gagal.
WalletFailure? parseWalletFailure(Response response) {
  if (response.statusCode == 401) return const WalletFailure.unauthorized();

  final body = response.data;
  if (body is! Map) return _failureFromStatus(response);
  if (body['success'] == true) return null;

  // Error PIN: `data` berisi `code` dan field tambahan.
  final data = body['data'];
  if (data is Map) {
    final pinFailure = _pinFailure(data['code']?.toString(), data);
    if (pinFailure != null) return pinFailure;
  }

  final errors = body['errors'];
  final first = errors is List && errors.isNotEmpty && errors.first is Map
      ? errors.first as Map
      : null;
  final code = first?['code']?.toString();

  switch (code) {
    case '303':
    case '310':
      return const WalletFailure.invalidRequest();
    case '304':
      return WalletFailure.rejected(first?['cause']?.toString() ?? '');
    case '404':
      return const WalletFailure.notFound();
    case '429':
      return WalletFailure.tooManyRequests(_retryAfterSeconds(response));
    case '900':
      return const WalletFailure.internalError();
  }

  return _pinFailure(code, const {}) ?? _failureFromStatus(response);
}

/// Isi `data` dari envelope sukses. Beberapa endpoint (mis. `/wallet`)
/// membungkus lagi payload-nya dalam `{ status, message, data }`, jadi lapisan
/// itu ikut dikupas.
Map<String, dynamic> walletDataOf(Response response) {
  final data = response.data['data'] as Map;
  final isInnerEnvelope =
      data.containsKey('status') &&
      data.containsKey('message') &&
      data['data'] is Map;
  return Map<String, dynamic>.from(isInnerEnvelope ? data['data'] : data);
}

WalletFailure? _pinFailure(String? code, Map data) {
  switch (code) {
    case 'PIN_NOT_SET':
      return const WalletFailure.pinNotSet();
    case 'PIN_INVALID':
      return WalletFailure.pinInvalid(_toInt(data['remaining_attempts']));
    case 'PIN_LOCKED':
      return WalletFailure.pinLocked(_toDateTime(data['locked_until']));
    case 'TRANSFER_BLOCKED':
      return WalletFailure.transferBlocked(
        _toDateTime(data['transfer_blocked_until']),
      );
  }
  return null;
}

WalletFailure _failureFromStatus(Response response) {
  final status = response.statusCode ?? 0;
  if (status == 404) return const WalletFailure.notFound();
  if (status == 429) {
    return WalletFailure.tooManyRequests(_retryAfterSeconds(response));
  }
  if (status >= 500) return const WalletFailure.internalError();
  return const WalletFailure.unexpectedError();
}

int _retryAfterSeconds(Response response) =>
    int.tryParse(response.headers.value('retry-after') ?? '') ??
    kDefaultOtpRetrySeconds;

int? _toInt(Object? value) =>
    value is int ? value : int.tryParse(value?.toString() ?? '');

DateTime? _toDateTime(Object? value) =>
    value == null ? null : DateTime.tryParse(value.toString());