import 'dart:convert';

import 'package:flutter_test/flutter_test.dart';

import 'package:http/http.dart' as http;
import 'package:http/testing.dart';

import 'package:sxchnge_auth/sxchnge_auth.dart';

void main() {
  http.Response response(Map<String, Object?> data, [int status = 202]) =>
      http.Response(jsonEncode({'data': data}), status);
  test('signup receipt avoids duplicate delivery and subsequent resend reaches API', () async {
    final paths = <String>[];
    final service = BackendAuthServices(
      baseUri: Uri.parse('https://api.example/api/v1'),
      clientId: 'web',
      client: MockClient((request) async {
        paths.add(request.url.path);
        if (request.url.path.endsWith('/signup')) {
          expect(jsonDecode(request.body)['password'], ' password preserved ');
          return response({'userId': 'user'});
        }
        return response({'accepted': true});
      }),
    );
    addTearDown(service.close);
    final result = await service.signup(
      const SignupRequest(
        name: 'User',
        email: 'USER@example.com',
        password: ' password preserved ',
        locale: 'en',
      ),
    );
    expect(result.isSimulated, isFalse);
    await service.send(email: 'user@example.com', locale: 'en');
    expect(paths, ['/api/v1/accounts/signup']);
    await service.send(email: 'user@example.com', locale: 'en');
    expect(paths.last, '/api/v1/accounts/verification/send');
  });
  test('login confirms backend session only after factor and consumes local grant once', () async {
    final now = DateTime.now();
    var verified = false;
    final service = BackendAuthServices(
      baseUri: Uri.parse('https://api.example/api/v1'),
      clientId: 'web',
      client: MockClient((request) async {
        final body = jsonDecode(request.body);
        if (request.url.path.endsWith('/login')) {
          expect(body['login'], {
            'login': 'user@example.com',
            'password': ' password ',
          });
          expect(body['clientId'], 'web');
          return response({
            'userId': 'user',
            'pendingToken': {'token': 'signed-pending'},
            'target': 'u***@example.com',
            'expiresAt': now.add(const Duration(minutes: 10)).toIso8601String(),
            'resendAt': now.add(const Duration(minutes: 1)).toIso8601String(),
          });
        }
        expect(request.url.path, '/api/v1/accounts/login/verify');
        expect(body['pendingToken'], 'signed-pending');
        if (body['code'] != '123456')
          return response({'error': 'invalid'}, 400);
        verified = true;
        return response({
          'account': {'id': 'user'},
          'accessToken': {'token': 'access'},
          'refreshToken': {'token': 'refresh'},
        }, 200);
      }),
    );
    addTearDown(service.close);
    final result = await service.login(
      const LoginRequest(
        email: 'user@example.com',
        password: ' password ',
        locale: 'en',
      ),
    );
    expect(result.challenge, isNotNull);
    expect(service.session, isNull);
    final challenge = result.challenge!;
    expect(challenge.id, isNot('signed-pending'));
    await expectLater(
      service.verify(challenge.id, '000000'),
      throwsA(isA<FactorException>()),
    );
    expect(verified, isFalse);
    expect(service.session, isNull);
    final grant = await service.verify(challenge.id, '123456');
    final accepted = await service.completeLogin(challenge, grant);
    expect(accepted.userId, 'user');
    expect(accepted.isSimulated, isFalse);
    expect(service.session!.accessToken, 'access');
    await expectLater(
      service.completeLogin(challenge, grant),
      throwsA(isA<AuthException>()),
    );
    await expectLater(
      service.authorize(FactorPurpose.payout, 'payment', grant.token),
      throwsA(isA<FactorException>()),
    );
  });
  test(
    'failed delivery preserves resend idempotency and never claims success',
    () async {
      final keys = <String>[];
      final service = BackendAuthServices(
        baseUri: Uri.parse('https://api.example/api/v1'),
        clientId: 'web',
        client: MockClient((request) async {
          keys.add(jsonDecode(request.body)['idempotencyKey'] as String);
          return response({'error': 'unavailable'}, 503);
        }),
      );
      addTearDown(service.close);
      for (var i = 0; i < 2; i++) {
        await expectLater(
          service.send(email: 'user@example.com', locale: 'en'),
          throwsA(isA<VerificationException>()),
        );
      }
      expect(keys[0], keys[1]);
    },
  );
  test('expired activation maps to recovery state', () async {
    final service = BackendAuthServices(
      baseUri: Uri.parse('https://api.example/api/v1'),
      clientId: 'web',
      client: MockClient((_) async => response({'error': 'expired'}, 400)),
    );
    addTearDown(service.close);
    await expectLater(
      service.confirm(token: 'expired'),
      throwsA(
        isA<VerificationException>().having(
          (e) => e.code,
          'code',
          VerificationError.expired,
        ),
      ),
    );
  });
}