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/community/community_models.dart';
import 'package:patbond_flutter/features/community/media_uploader.dart';
import 'package:patbond_flutter/features/profile/profile_controller.dart';
import 'package:patbond_flutter/features/profile/profile_edit_page.dart';

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

/// T3.5-08 编辑页：**PATCH 三态载荷**是本文件的重点。
///
/// 每个成功用例都断言一次「未改字段的键不出现在 JSON 里」——这是三态与
/// 两态的唯一可观测差别，也是「只改昵称却把头像清掉」这类事故的唯一防线。

/// 昵称输入框（AppTextField 内层 TextFormField）。
Finder get nicknameField => find.byType(TextFormField);

void main() {
  late FakeCommunityRepository community;
  late FakeMediaImagePicker picker;
  late FakeMediaCompressor compressor;
  late FakeDirectUploadClient direct;

  setUp(() {
    community = FakeCommunityRepository();
    community.onGetMyCommunityStats = () async =>
        CommunityStats.fromJson(sampleCommunityStatsJson());
    community.onGetFollowStats = (_) async =>
        FollowStats.fromJson(sampleFollowStatsJson());
    picker = FakeMediaImagePicker([decodablePickedImage()]);
    compressor = FakeMediaCompressor();
    direct = FakeDirectUploadClient();
    community.onCreateMediaUpload = (_) async => credentials();
    community.onCompleteMediaUpload = (assetId) async =>
        readyAsset(assetId: assetId);
  });

  MediaUploader buildUploader(MediaPurpose purpose) => MediaUploader(
    repository: community,
    purpose: purpose,
    picker: picker,
    compressor: compressor,
    directUpload: direct,
    maxImages: 1,
    maxConcurrentUploads: 1,
  );

  /// 直接 push 编辑页（资料页链路另有测试；这里只测编辑页本身）。
  Future<FakeAuthRepository> pumpEdit(
    WidgetTester tester, {
    String? nickname,
    String? avatarUrl,
    bool withUploader = true,
    ApiException? saveError,
  }) async {
    tester.view.physicalSize = const Size(700, 1800);
    tester.view.devicePixelRatio = 1.0;
    addTearDown(tester.view.reset);
    final auth = FakeAuthRepository(
      meHandler: () async => buildProfile(
        username: 'llx',
        nickname: nickname,
        avatarUrl: avatarUrl,
      ),
      updateMeHandler: (_) async {
        if (saveError != null) throw saveError;
        return buildProfile(username: 'llx', nickname: nickname);
      },
    );
    final controller = ProfileController(
      authRepository: auth,
      communityRepository: community,
    );
    addTearDown(controller.dispose);
    await controller.refresh();
    await tester.pumpWidget(
      MaterialApp(
        theme: buildAppTheme(),
        home: ProfileEditPage(
          controller: controller,
          avatarUploaderBuilder: withUploader ? buildUploader : null,
        ),
      ),
    );
    await tester.pumpAndSettle();
    return auth;
  }

  group('三态载荷', () {
    testWidgets('只改昵称 → 载荷只有 nickname，avatarAssetId 键不出现', (tester) async {
      final auth = await pumpEdit(
        tester,
        avatarUrl: 'https://m/a.jpg?X-Amz-Signature=s',
      );

      await tester.enterText(nicknameField, '小柴');
      await tester.pump();
      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      final payload = auth.updateMePayloads.single;
      expect(payload, {'nickname': '小柴'});
      expect(
        payload.containsKey('avatarAssetId'),
        isFalse,
        reason: '发成 avatarAssetId: null 会把用户已有头像一起清掉',
      );
    });

    testWidgets('点「清除昵称」 → nickname 显式 null，头像键不出现', (tester) async {
      final auth = await pumpEdit(
        tester,
        nickname: '小柴',
        avatarUrl: 'https://m/a.jpg?X-Amz-Signature=s',
      );

      await tester.tap(find.text('清除昵称'));
      await tester.pumpAndSettle();
      expect(find.text('保存后将清除昵称，展示名回退为用户名'), findsOneWidget);

      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      final payload = auth.updateMePayloads.single;
      expect(payload.containsKey('nickname'), isTrue);
      expect(payload['nickname'], isNull);
      expect(payload.containsKey('avatarAssetId'), isFalse);
    });

    testWidgets('点「清除头像」 → avatarAssetId 显式 null，nickname 键不出现', (
      tester,
    ) async {
      final auth = await pumpEdit(
        tester,
        nickname: '小柴',
        avatarUrl: 'https://m/a.jpg?X-Amz-Signature=s',
      );

      await tester.tap(find.text('清除头像'));
      await tester.pumpAndSettle();
      expect(find.text('保存后将移除头像'), findsOneWidget);

      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      final payload = auth.updateMePayloads.single;
      expect(payload.containsKey('avatarAssetId'), isTrue);
      expect(payload['avatarAssetId'], isNull);
      expect(
        payload.containsKey('nickname'),
        isFalse,
        reason: '昵称没碰过就不该出现在载荷里（更不该是 null）',
      );
    });

    testWidgets('输入与原昵称相同 → 视为未改，保存钮禁用、不发请求', (tester) async {
      final auth = await pumpEdit(tester, nickname: '小柴');

      // 预填即原值。
      expect(find.text('小柴'), findsOneWidget);
      final button = tester.widget<FilledButton>(
        find.widgetWithText(FilledButton, '保存'),
      );
      expect(button.onPressed, isNull);
      expect(auth.updateMePayloads, isEmpty);
    });

    testWidgets('无昵称时预填空串（不预填 username，避免把回退固化成真昵称）', (tester) async {
      await pumpEdit(tester);

      final field = tester.widget<TextFormField>(nicknameField);
      expect(field.controller!.text, '');
      expect(find.text('未设置，当前展示为用户名「llx」'), findsOneWidget);
      // 无昵称时不给「清除昵称」入口（清一个不存在的东西无意义）。
      expect(find.text('清除昵称'), findsNothing);
    });
  });

  group('校验与失败语义', () {
    testWidgets('33 码点昵称：字段级 errorText，不发请求', (tester) async {
      final auth = await pumpEdit(tester);

      await tester.enterText(nicknameField, '柴' * 33);
      await tester.pump();
      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      expect(find.text('昵称最多 32 个字'), findsOneWidget);
      expect(auth.updateMePayloads, isEmpty);
    });

    testWidgets('纯空格昵称：不是隐式清空，提示走显式清除入口', (tester) async {
      final auth = await pumpEdit(tester, nickname: '小柴');

      await tester.enterText(nicknameField, '   ');
      await tester.pump();
      // 空白输入被判为「不改」，保存钮禁用（不会误发清空）。
      final button = tester.widget<FilledButton>(
        find.widgetWithText(FilledButton, '保存'),
      );
      expect(button.onPressed, isNull);
      expect(auth.updateMePayloads, isEmpty);
    });

    testWidgets('42203 头像未就绪 → 横幅提示，页面留在编辑态可重试', (tester) async {
      await pumpEdit(
        tester,
        saveError: const ApiBusinessException(
          code: ApiCodes.mediaNotReady,
          message: 'asset uploading',
        ),
      );

      await tester.enterText(nicknameField, '小柴');
      await tester.pump();
      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      expect(find.byType(InlineErrorBanner), findsOneWidget);
      expect(find.text('头像还没上传完，请稍后重试'), findsOneWidget);
      expect(find.byType(ProfileEditPage), findsOneWidget);
    });

    testWidgets('40405 头像 asset 失效 → 提示重新上传', (tester) async {
      await pumpEdit(
        tester,
        saveError: const ApiBusinessException(
          code: ApiCodes.mediaNotFound,
          message: 'gone',
        ),
      );

      await tester.enterText(nicknameField, '小柴');
      await tester.pump();
      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      expect(find.text('头像已失效，请重新上传'), findsOneWidget);
    });
  });

  group('头像上传接线', () {
    testWidgets('上传全链路：purpose=user_avatar，ready 后确认 → 载荷带新 assetId', (
      tester,
    ) async {
      final auth = await pumpEdit(tester);

      await tester.tap(find.text('更换头像'));
      await tester.pumpAndSettle();

      // 上传成功后 sheet 给预览 + 「使用这张」。
      expect(find.text('使用这张'), findsOneWidget);
      await tester.tap(find.text('使用这张'));
      await tester.pumpAndSettle();

      // 用途即引用侧的类型检查：必须是 user_avatar。
      final request = community.lastMediaUploadRequest!;
      expect(request.purpose, MediaPurpose.userAvatar);
      expect(request.purpose.wire, 'user_avatar');

      expect(find.text('已选择\n新头像'), findsOneWidget);

      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      final payload = auth.updateMePayloads.single;
      expect(payload, {'avatarAssetId': 'a-1'});
      expect(payload.containsKey('nickname'), isFalse);
    });

    testWidgets('上传后再改昵称 → 两键齐出（一次 PATCH 改两样）', (tester) async {
      final auth = await pumpEdit(tester);

      await tester.tap(find.text('更换头像'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('使用这张'));
      await tester.pumpAndSettle();

      await tester.enterText(nicknameField, '小柴');
      await tester.pump();
      await tester.tap(find.text('保存'));
      await tester.pumpAndSettle();

      expect(auth.updateMePayloads.single, {
        'nickname': '小柴',
        'avatarAssetId': 'a-1',
      });
    });
  });
}