// feature_auth 的高价值断言：
//   1. 登录失败不能变成未捕获异常（"密码错了"不是崩溃），要留在 state 里展示。
//   2. 提交中按钮必须置灰——门店网络慢，用户会反复点。

import 'dart:async';

import 'package:core_auth/core_auth.dart';
import 'package:core_foundation/core_foundation.dart';
import 'package:feature_auth/feature_auth.dart';
// LoginPage 不对外导出（别的包没有直接构造它的正当理由），测试走 src。
import 'package:feature_auth/src/presentation/login_page.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';

class _FailingRepo implements AuthRepository {
  /// 非 null 时 login 挂在这个 completer 上，用来观察"请求在途"这一帧。
  Completer<LoginResult>? gate;
  int calls = 0;
  String? lastUsername;

  @override
  Future<LoginResult> login({required String username, required String password}) {
    calls++;
    lastUsername = username;
    return gate?.future ?? Future<LoginResult>.error(const BusinessException(40101, '账号或密码错误'));
  }

  @override
  Future<UserContext> fetchCurrentUser() => throw UnimplementedError();

  @override
  Future<List<StoreContext>> fetchAccessibleStores() => throw UnimplementedError();

  @override
  Future<StoreContext> switchStore(int storeId) => throw UnimplementedError();

  @override
  Future<void> revokeSession() => throw UnimplementedError();
}

void main() {
  testWidgets('登录失败展示业务文案，不抛出未捕获异常', (WidgetTester tester) async {
    final _FailingRepo repo = _FailingRepo();

    await tester.pumpWidget(
      ProviderScope(
        overrides: [authRepositoryProvider.overrideWithValue(repo)],
        child: const MaterialApp(home: LoginPage()),
      ),
    );

    // 前后空格是扫码枪/手动输入的常见污染，必须在提交前 trim。
    await tester.enterText(find.byKey(const Key('login_username')), '  clerk01  ');
    await tester.enterText(find.byKey(const Key('login_password')), 'pwd');
    await tester.tap(find.byKey(const Key('login_submit')));
    await tester.pump();

    expect(repo.lastUsername, 'clerk01');

    await tester.pumpAndSettle();
    expect(find.text('账号或密码错误'), findsOneWidget);
    expect(tester.takeException(), isNull);
  });

  testWidgets('提交中按钮置灰，重复点击不会重复发请求', (WidgetTester tester) async {
    final _FailingRepo repo = _FailingRepo()..gate = Completer<LoginResult>();

    await tester.pumpWidget(
      ProviderScope(
        overrides: [authRepositoryProvider.overrideWithValue(repo)],
        child: const MaterialApp(home: LoginPage()),
      ),
    );

    await tester.tap(find.byKey(const Key('login_submit')));
    await tester.pump(); // 请求还挂在 gate 上，这一帧就是"提交中"

    final FilledButton button = tester.widget(find.byKey(const Key('login_submit')));
    expect(button.onPressed, isNull, reason: '门店网络慢，用户会反复点');

    await tester.tap(find.byKey(const Key('login_submit')), warnIfMissed: false);
    await tester.pump();
    expect(repo.calls, 1);

    repo.gate!.completeError(const BusinessException(40101, '账号或密码错误'));
    await tester.pumpAndSettle();
  });
}