import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/network/api_exception.dart';
import 'package:patbond_flutter/core/theme/app_theme.dart';
import 'package:patbond_flutter/core/widgets/inline_error_banner.dart';
import 'package:patbond_flutter/features/auth/auth_repository.dart';
import 'package:patbond_flutter/features/auth/login_page.dart';

import '../../helpers/auth_test_helpers.dart';

void main() {
  Future<void> pumpLogin(WidgetTester tester, AuthRepository repository) {
    return tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: LoginPage(authRepository: repository),
      ),
    );
  }

  Future<void> fillValidInput(WidgetTester tester) async {
    await tester.enterText(find.byType(TextFormField).at(0), 'gunnar');
    await tester.enterText(find.byType(TextFormField).at(1), 'passw0rd');
  }

  testWidgets('初始态：品牌区、两个输入框、登录按钮与注册链接，无错误无 loading', (tester) async {
    await pumpLogin(tester, FakeAuthRepository());

    expect(find.text('Patbond'), findsOneWidget);
    expect(find.text('用户名 / 手机号'), findsOneWidget);
    expect(find.text('密码'), findsOneWidget);
    expect(find.text('登录'), findsOneWidget);
    expect(find.text('立即注册'), findsOneWidget);
    expect(find.byType(InlineErrorBanner), findsNothing);
    expect(find.byType(CircularProgressIndicator), findsNothing);
  });

  testWidgets('loading 态：按钮转圈、字段禁用、注册链接不可点', (tester) async {
    final completer = Completer<void>();
    final repository = FakeAuthRepository(loginHandler: () => completer.future);
    await pumpLogin(tester, repository);

    await fillValidInput(tester);
    await tester.tap(find.text('登录'));
    await tester.pump();

    expect(find.byType(CircularProgressIndicator), findsOneWidget);
    final fields = tester.widgetList<TextFormField>(find.byType(TextFormField));
    expect(fields.every((field) => field.enabled == false), isTrue);
    final registerLink = tester.widget<TextButton>(
      find.widgetWithText(TextButton, '立即注册'),
    );
    expect(registerLink.onPressed, isNull);

    completer.complete();
    await tester.pumpAndSettle();
    expect(find.byType(CircularProgressIndicator), findsNothing);
  });

  testWidgets('字段错误态：空表单提交显示两条字段级错误，输入即清除', (tester) async {
    final repository = FakeAuthRepository();
    await pumpLogin(tester, repository);

    await tester.tap(find.text('登录'));
    await tester.pump();

    expect(find.text('请输入用户名或手机号'), findsOneWidget);
    expect(find.text('请输入密码'), findsOneWidget);
    expect(repository.loginCalls, 0);

    await tester.enterText(find.byType(TextFormField).at(0), 'g');
    await tester.pump();
    expect(find.text('请输入用户名或手机号'), findsNothing);
    expect(find.text('请输入密码'), findsOneWidget);
  });

  testWidgets('横幅错误态：40100 显示「用户名或密码错误」，任一字段输入即清除', (tester) async {
    final repository = FakeAuthRepository(
      loginHandler: () => Future.error(
        const ApiBusinessException(code: ApiCodes.badCredentials, message: ''),
      ),
    );
    await pumpLogin(tester, repository);

    await fillValidInput(tester);
    await tester.tap(find.text('登录'));
    await tester.pumpAndSettle();

    expect(find.byType(InlineErrorBanner), findsOneWidget);
    expect(find.text('用户名或密码错误'), findsOneWidget);
    expect(repository.loginCalls, 1);

    await tester.enterText(find.byType(TextFormField).at(1), 'changed1');
    await tester.pump();
    expect(find.byType(InlineErrorBanner), findsNothing);
  });
}