95 lines
2.7 KiB
Dart
95 lines
2.7 KiB
Dart
import 'dart:convert';
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import 'package:http/http.dart' as http;
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import 'package:intl/intl.dart';
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class ForexConversionResult {
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ForexConversionResult({required this.quote, required this.result});
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final double quote;
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final double result;
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}
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class ForexRateApiService {
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ForexRateApiService({required this.httpClient, required this.apiKey});
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final http.Client httpClient;
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final String apiKey;
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Future<double> fetchUsdToSekRate({required DateTime estDate}) async {
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if (apiKey == 'REPLACE_WITH_YOUR_FOREXRATE_API_KEY') {
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throw StateError('ForexRateAPI key is not configured.');
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}
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final date = DateFormat('yyyy-MM-dd').format(estDate);
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final uri = Uri.https('api.forexrateapi.com', '/v1/$date', <String, String>{
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'api_key': apiKey,
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'base': 'USD',
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'currencies': 'SEK',
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});
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final response = await httpClient.get(uri);
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if (response.statusCode != 200) {
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throw StateError('ForexRateAPI request failed (${response.statusCode}).');
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}
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final json = jsonDecode(response.body) as Map<String, dynamic>;
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final success = json['success'] as bool? ?? false;
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if (!success) {
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throw StateError('ForexRateAPI returned success=false.');
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}
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final rates = json['rates'] as Map<String, dynamic>?;
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final sek = rates?['SEK'];
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if (sek == null) {
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throw StateError('SEK rate was missing in API response.');
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}
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return (sek as num).toDouble();
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}
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Future<ForexConversionResult> convertUsdToSek({
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required DateTime estDate,
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required double amount,
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}) async {
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if (apiKey == 'REPLACE_WITH_YOUR_FOREXRATE_API_KEY') {
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throw StateError('ForexRateAPI key is not configured.');
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}
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final date = DateFormat('yyyy-MM-dd').format(estDate);
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final uri =
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Uri.https('api.forexrateapi.com', '/v1/convert', <String, String>{
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'api_key': apiKey,
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'from': 'USD',
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'to': 'SEK',
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'amount': amount.toStringAsFixed(2),
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'date': date,
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});
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final response = await httpClient.get(uri);
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if (response.statusCode != 200) {
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throw StateError('ForexRateAPI convert failed (${response.statusCode}).');
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}
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final json = jsonDecode(response.body) as Map<String, dynamic>;
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final success = json['success'] as bool? ?? false;
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if (!success) {
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throw StateError('ForexRateAPI convert returned success=false.');
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}
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final info = json['info'] as Map<String, dynamic>?;
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final quote = info?['quote'];
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final result = json['result'];
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if (quote == null || result == null) {
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throw StateError(
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'ForexRateAPI convert response was missing quote/result.',
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);
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}
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return ForexConversionResult(
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quote: (quote as num).toDouble(),
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result: (result as num).toDouble(),
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);
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}
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}
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