import 'package:flutter_test/flutter_test.dart';
import 'package:http/http.dart' as http;
import 'package:http/testing.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:words999/services/settings_repository.dart';
import 'package:words999/services/true_random_service.dart';

void main() {
  group('parseRandomOrgPlain', () {
    test('reads three d10 faces', () {
      expect(parseRandomOrgPlain('7\n4\n2\n', 3), [7, 4, 2]);
    });

    test('rejects quota / error pages', () {
      expect(
        () => parseRandomOrgPlain('Error: Quota exceeded', 3),
        throwsFormatException,
      );
    });
  });

  group('parseRandomOrgSequence', () {
    test('reads a permutation', () {
      expect(parseRandomOrgSequence('2\n0\n1\n', 0, 2), [2, 0, 1]);
    });

    test('rejects duplicates', () {
      expect(
        () => parseRandomOrgSequence('0\n0\n1\n', 0, 2),
        throwsFormatException,
      );
    });
  });

  group('parseRandomOrgJsonRpc', () {
    test('reads generateIntegers payload', () {
      const body = '''
      {"jsonrpc":"2.0","result":{"random":{"data":[0,9,5]},"bitsUsed":12},"id":1}
      ''';
      expect(parseRandomOrgJsonRpc(body, 3), [0, 9, 5]);
    });

    test('rejects API error objects', () {
      expect(
        () => parseRandomOrgJsonRpc(
          '{"jsonrpc":"2.0","error":{"code":401,"message":"bad key"},"id":1}',
          3,
        ),
        throwsFormatException,
      );
    });
  });

  group('TrueRandomService', () {
    test('uses RANDOM.ORG HTTP when the client succeeds', () async {
      final client = MockClient((request) async {
        expect(request.url.host, 'www.random.org');
        expect(request.url.path, '/integers/');
        expect(request.url.queryParameters['num'], '3');
        expect(request.url.queryParameters['min'], '0');
        expect(request.url.queryParameters['max'], '9');
        return http.Response('1\n8\n3\n', 200);
      });
      final service = TrueRandomService(
        client: client,
        apiKey: '',
        minInterval: Duration.zero,
      );
      final roll = await service.take(3);
      expect(roll.digits, [1, 8, 3]);
      expect(roll.source, RandomSource.randomOrg);
      expect(roll.asNumber, 183);
    });

    test('falls back to local CSPRNG when RANDOM.ORG fails', () async {
      final client = MockClient((request) async {
        return http.Response('Error: Service unavailable', 503);
      });
      final service = TrueRandomService(
        client: client,
        apiKey: '',
        timeout: const Duration(milliseconds: 200),
        minInterval: Duration.zero,
      );
      final roll = await service.take(3);
      expect(roll.digits.length, 3);
      expect(roll.digits.every((d) => d >= 0 && d <= 9), isTrue);
      expect(roll.source, RandomSource.local);
    });

    test('uses JSON-RPC when an API key is set', () async {
      final client = MockClient((request) async {
        expect(request.url.host, 'api.random.org');
        expect(request.method, 'POST');
        return http.Response(
          '{"jsonrpc":"2.0","result":{"random":{"data":[9,0,1]}},"id":1}',
          200,
        );
      });
      final service = TrueRandomService(
        client: client,
        apiKey: 'dev-key',
        minInterval: Duration.zero,
      );
      final roll = await service.take(3);
      expect(roll.digits, [9, 0, 1]);
      expect(roll.source, RandomSource.randomOrg);
    });

    test('production instance reads API key from settings, not the hashed dashboard value', () async {
      SharedPreferences.setMockInitialValues({});
      await SettingsRepository().init();
      await SettingsRepository().setRandomOrgApiKey(
        '11111111-2222-4333-8444-555555555555',
      );

      String? sentBody;
      final client = MockClient((request) async {
        sentBody = request.body;
        expect(request.url.host, 'api.random.org');
        return http.Response(
          '{"jsonrpc":"2.0","result":{"random":{"data":[2,2,8]}},"id":1}',
          200,
        );
      });
      final service = TrueRandomService(
        client: client,
        minInterval: Duration.zero,
      );
      final roll = await service.take(3);
      expect(roll.digits, [2, 2, 8]);
      expect(sentBody, contains('11111111-2222-4333-8444-555555555555'));
      expect(sentBody, isNot(contains('hashedApiKey')));
    });

    test('permutation uses generateIntegers without replacement', () async {
      String? body;
      final client = MockClient((request) async {
        expect(request.url.host, 'api.random.org');
        body = request.body;
        return http.Response(
          '{"jsonrpc":"2.0","result":{"random":{"data":[3,0,2,1]}},"id":1}',
          200,
        );
      });
      final service = TrueRandomService(
        client: client,
        apiKey: 'dev-key',
        minInterval: Duration.zero,
      );
      final shuffle = await service.permutation(min: 0, max: 3);
      expect(body, contains('"replacement":false'));
      expect(body, contains('"n":4'));
      expect(shuffle.source, RandomSource.randomOrg);
      expect(shuffle.order, [3, 0, 2, 1]);
      expect(isPermutation(shuffle.order, 0, 3), isTrue);
    });

    test('permutation falls back locally when RANDOM.ORG fails', () async {
      final client = MockClient((request) async {
        return http.Response('Error: Service unavailable', 503);
      });
      final service = TrueRandomService(
        client: client,
        apiKey: 'dev-key',
        minInterval: Duration.zero,
      );
      final shuffle = await service.permutation(min: 0, max: 9);
      expect(shuffle.source, RandomSource.local);
      expect(isPermutation(shuffle.order, 0, 9), isTrue);
    });
  });
}