/// 修改密码页 widget 测试（P3 计划 Task 3）。
///
/// 覆盖：客户端校验（新密码 ≥8、两次一致；不发请求）、旧密码错误
/// （401 AUTH_INVALID_CREDENTIALS）→「当前密码错误」文案且本地会话保留
/// （password-change 的 401 不驱逐）、成功 → toast + pop 回上级且
/// 会话令牌不变（服务端保留当前会话语义）。
library;

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:photo_live/core/api_client.dart';
import 'package:photo_live/core/error_codes.dart';
import 'package:photo_live/core/session_store.dart';
import 'package:photo_live/l10n/app_localizations.dart';
import 'package:photo_live/pages/password_change_page.dart';

import '../helpers/fakes.dart';

void main() {
  late FakeSessionStore store;
  late int unauthorizedCalls;

  setUp(() {
    store = FakeSessionStore();
    unauthorizedCalls = 0;
  });

  ApiClient clientOf(FakeAdapter adapter) => ApiClient(
        sessionStore: store,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      )..onUnauthorized = () => unauthorizedCalls++;

  void seedSession() {
    store.session = Session(
      token: 'tok-live-1',
      expiresAt: DateTime.utc(2099, 1, 1),
      account: 'staff01',
    );
  }

  Future<void> pumpOverMarker(WidgetTester tester, ApiClient client) async {
    await tester.pumpWidget(
      ProviderScope(
        overrides: [apiClientProvider.overrideWith((ref) => client)],
        child: MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: const Scaffold(body: Center(child: Text('MARK'))),
          routes: {
            '/password-change': (context) => const PasswordChangePage(),
          },
        ),
      ),
    );
    tester.state<NavigatorState>(find.byType(Navigator).first)
        .pushNamed('/password-change');
    await tester.pumpAndSettle();
  }

  Future<void> fill(
    WidgetTester tester, {
    String oldPw = 'old-pass-123',
    String newPw = 'brand-new-pass-9',
    String confirmPw = 'brand-new-pass-9',
  }) async {
    await tester.enterText(
      find.widgetWithText(TextFormField, 'Current password'),
      oldPw,
    );
    await tester.enterText(
      find.widgetWithText(TextFormField, 'New password'),
      newPw,
    );
    await tester.enterText(
      find.widgetWithText(TextFormField, 'Confirm new password'),
      confirmPw,
    );
  }

  testWidgets('新密码过短 → 客户端校验提示，不发请求', (tester) async {
    seedSession();
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpOverMarker(tester, clientOf(adapter));

    await fill(tester, newPw: 'short7', confirmPw: 'short7');
    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
    await tester.pump();

    expect(
      find.text('New password must be at least 8 characters'),
      findsOneWidget,
    );
    expect(adapter.requests, isEmpty);
  });

  testWidgets('两次新密码不一致 → 校验提示，不发请求', (tester) async {
    seedSession();
    final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
    await pumpOverMarker(tester, clientOf(adapter));

    await fill(tester, confirmPw: 'different-pass-9');
    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
    await tester.pump();

    expect(
      find.text('New passwords do not match'),
      findsOneWidget,
    );
    expect(adapter.requests, isEmpty);
  });

  testWidgets('旧密码错误（401）→ 「当前密码错误」文案，会话保留不驱逐', (tester) async {
    seedSession();
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/auth/password-change'
          ? (401, errorBody(ErrorCodes.authInvalidCredentials))
          : throw StateError('unexpected ${o.path}'),
    );
    await pumpOverMarker(tester, clientOf(adapter));

    await fill(tester);
    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
    await tester.pumpAndSettle();

    expect(find.text('Current password is incorrect'), findsOneWidget);
    expect(store.session?.token, 'tok-live-1', reason: '旧密码错误不清会话');
    expect(unauthorizedCalls, 0, reason: 'password-change 的 401 不驱逐');
    expect(find.text('MARK'), findsNothing, reason: '停留在修改密码页');
  });

  testWidgets('成功 → toast + pop 回上级；会话令牌不变（当前会话保留）', (tester) async {
    seedSession();
    final adapter = FakeAdapter(
      (o) => o.path == '/v1/auth/password-change'
          ? (204, null)
          : throw StateError('unexpected ${o.path}'),
    );
    await pumpOverMarker(tester, clientOf(adapter));

    await fill(tester);
    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
    await tester.pumpAndSettle();

    final req = adapter.requests.single;
    expect(req.method, 'POST');
    expect(req.path, '/v1/auth/password-change');
    expect(req.headers['Authorization'], 'Bearer tok-live-1');
    expect(req.body, {
      'oldPassword': 'old-pass-123',
      'newPassword': 'brand-new-pass-9',
    });

    expect(find.text('Password changed'), findsOneWidget);
    expect(find.text('MARK'), findsOneWidget, reason: '成功后 pop 回上级');
    expect(
      store.session?.token,
      'tok-live-1',
      reason: '服务端保留当前会话：本地令牌无需变更',
    );
  });
}