/// 照片管理网格 widget 测试（UI-01 §4.3；UI-03 §4 页面 17 回归）。
///
/// 覆盖：标题（计数 + 相册副标题）、网格列数（极窄 2 / 默认 3 / 宽屏 5）、
/// 状态角标（处理中/失败/隐藏/删除，每张至多一个）、筛选 chips（选中=
/// 主色蓝；服务端 visibility 重载 / 本地 processing 过滤）、scope 自适应
/// （all 403 → own + 协作者提示）、游标加载第二页、尾格失败重试、空态、
/// 点开大图查看器。
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/features/albums/models.dart';
import 'package:photo_live/l10n/app_localizations.dart';
import 'package:photo_live/pages/album_photos_page.dart';
import 'package:photo_live/pages/album_photo_viewer_page.dart';
import 'package:photo_live/ui/components/photo_thumbnail.dart';
import 'package:photo_live/ui/components/state_badge.dart';

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

void main() {
  late FakeSessionStore store;

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

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

  Future<void> pumpPhotos(WidgetTester tester, ApiClient client) async {
    await tester.pumpWidget(
      ProviderScope(
        overrides: [...pageTestOverrides(session: store, client: client)],
        child: MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: AlbumPhotosPage(album: Album.fromJson(albumJson())),
        ),
      ),
    );
    await tester.pumpAndSettle();
  }

  void setSurface(WidgetTester tester, Size size) {
    tester.view.physicalSize = size;
    tester.view.devicePixelRatio = 1.0;
  }

  testWidgets('标题：计数随筛选条目数 + 相册名做副标题', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-t1', preview: photoPreviewJson()),
          adminPhotoJson(photoId: 'ph-t2', preview: photoPreviewJson()),
          adminPhotoJson(photoId: 'ph-t3', preview: photoPreviewJson()),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));

    // 计数 = 当前筛选下已加载条目数（游标接口无总量，不伪造总数）。
    expect(find.text('3 photos'), findsOneWidget);
    // 副标题 = 相册展示名（en 回退）。
    expect(find.text('Opening Gala'), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('网格列数：350→2 / 390→3 / 800→5（平板按格宽扩列）', (tester) async {
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      // 非空列表（空态不渲染 GridView，无法断言 delegate）。
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-c1', preview: photoPreviewJson()),
          adminPhotoJson(photoId: 'ph-c2', preview: photoPreviewJson()),
        ]),
      );
    });
    final client = clientOf(adapter);

    setSurface(tester, const Size(350, 800));
    await pumpPhotos(tester, client);
    expect(_columnCount(tester), 2, reason: '极窄屏两列');

    setSurface(tester, const Size(390, 844));
    await pumpPhotos(tester, client);
    expect(_columnCount(tester), 3, reason: '默认三列');

    setSurface(tester, const Size(800, 600));
    await pumpPhotos(tester, client);
    expect(_columnCount(tester), 5, reason: '800/150 向下取整 5 列');

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('缩略图 + 状态角标（处理中/失败/隐藏；就绪公开无角标）', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-ready', preview: photoPreviewJson()),
          adminPhotoJson(
            photoId: 'ph-processing',
            processingState: 'processing',
            visibility: 'unpublished',
          ),
          adminPhotoJson(
            photoId: 'ph-failed',
            processingState: 'processing_failed',
            visibility: 'unpublished',
          ),
          adminPhotoJson(photoId: 'ph-hidden', visibility: 'hidden'),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));

    // 缩略图来自 preview.thumb（测试环境网络失败 → 替代图占位，不破图）。
    expect(find.byType(PhotoThumbnail), findsNWidgets(4));
    expect(find.byIcon(Icons.broken_image_outlined), findsOneWidget);
    // 角标：处理中/失败/隐藏（图标 + 文案，不只靠颜色；文案限定在角标
    // 组件内——筛选 chips 有同名标签）。
    Finder badgeText(String label) => find.descendant(
          of: find.byType(StateBadge),
          matching: find.text(label),
        );
    expect(badgeText('Processing'), findsOneWidget);
    expect(badgeText('Processing failed'), findsOneWidget);
    expect(badgeText('Hidden'), findsOneWidget);
    expect(find.byIcon(Icons.hourglass_top), findsOneWidget);
    expect(find.byIcon(Icons.error_outline), findsOneWidget);
    expect(find.byIcon(Icons.remove_circle_outline), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('scope 自适应：all 403 → own 重试 + 协作者提示', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      final scope = o.uri.queryParameters['scope'];
      if (scope == 'all') return (403, errorBody(ErrorCodes.authForbidden));
      if (scope == 'own') {
        return (
          200,
          cursorPageBody(<Map<String, dynamic>>[
            adminPhotoJson(photoId: 'ph-own-1'),
          ]),
        );
      }
      throw StateError('unexpected scope $scope');
    });
    await pumpPhotos(tester, clientOf(adapter));

    // 两次请求：all（403）→ own（200，服务端过滤自己上传）。
    expect(adapter.requests, hasLength(2));
    expect(adapter.requests.first.uri.queryParameters['scope'], 'all');
    expect(adapter.requests.last.uri.queryParameters['scope'], 'own');
    // 协作者范围提示可见。
    expect(
      find.text('Collaborator view: only photos you uploaded are shown'),
      findsOneWidget,
    );

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('游标加载第二页（携带 cursor）', (tester) async {
    setSurface(tester, const Size(390, 844));
    final page1 = List<Map<String, dynamic>>.generate(
      20,
      (i) => adminPhotoJson(
        photoId: 'ph-${(i + 1).toString().padLeft(8, '0')}',
        preview: photoPreviewJson(),
      ),
    );
    final page2 = <Map<String, dynamic>>[
      adminPhotoJson(photoId: 'ph-page2item', preview: photoPreviewJson()),
    ];
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      final cursor = o.uri.queryParameters['cursor'];
      if (cursor == null) {
        return (200, cursorPageBody(page1, nextCursor: 'pc1'));
      }
      if (cursor == 'pc1') return (200, cursorPageBody(page2));
      throw StateError('unexpected cursor $cursor');
    });
    await pumpPhotos(tester, clientOf(adapter));

    // 滚动加载第二页。
    await tester.drag(find.byType(GridView), const Offset(0, -4000));
    await tester.pumpAndSettle();
    expect(
      adapter.requests.last.uri.queryParameters['cursor'],
      'pc1',
    );

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('筛选 chips：Published 走服务端 visibility 重载', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-1', preview: photoPreviewJson()),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));

    await tester.tap(find.widgetWithText(FilterChip, 'Published'));
    await tester.pumpAndSettle();

    expect(
      adapter.requests.last.uri.queryParameters['visibility'],
      'published',
      reason: 'Published 筛选下发服务端 visibility 参数',
    );
    // 选中 chip = 主色蓝底（UI-03 页面 17）。
    final chip = tester.widget<FilterChip>(
      find.widgetWithText(FilterChip, 'Published'),
    );
    expect(chip.selected, isTrue);
    expect(chip.selectedColor, Theme.of(tester.element(find.byType(FilterChip).first)).colorScheme.primary);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('尾格：加载更多失败 → 可点重试 → 补齐第二页', (tester) async {
    setSurface(tester, const Size(390, 844));
    final page1 = List<Map<String, dynamic>>.generate(
      20,
      (i) => adminPhotoJson(
        photoId: 'ph-r${(i + 1).toString().padLeft(2, '0')}',
        preview: photoPreviewJson(),
      ),
    );
    var cursorCalls = 0;
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      final cursor = o.uri.queryParameters['cursor'];
      if (cursor == null) {
        return (200, cursorPageBody(page1, nextCursor: 'rc1'));
      }
      cursorCalls++;
      // 第一次翻页失败（保留已加载条目），重试成功。
      if (cursorCalls == 1) {
        return (500, errorBody(ErrorCodes.internalError));
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-r-page2', preview: photoPreviewJson()),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));

    // 滚到底触发翻页 → 失败 → 已加载条目保留 + 尾格显示重试入口。
    await tester.drag(find.byType(GridView), const Offset(0, -4000));
    await tester.pumpAndSettle();
    expect(find.text('Failed to load more. Tap to retry'), findsOneWidget);
    expect(find.byKey(const ValueKey('grid-photo-ph-r20')), findsOneWidget);
    expect(find.byKey(const ValueKey('grid-photo-ph-r-page2')), findsNothing);

    // 点重试 → 第二页补齐（重试入口消失、第二页条目可滚动到位）。
    await tester.tap(find.text('Failed to load more. Tap to retry'));
    await tester.pumpAndSettle();
    expect(find.text('Failed to load more. Tap to retry'), findsNothing);
    await tester.drag(find.byType(GridView), const Offset(0, -4000));
    await tester.pumpAndSettle();
    expect(find.byKey(const ValueKey('grid-photo-ph-r-page2')), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('本地筛选：Processing 只显示未就绪条目（不发新请求）', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-ready', preview: photoPreviewJson()),
          adminPhotoJson(
            photoId: 'ph-busy',
            processingState: 'processing',
            visibility: 'unpublished',
          ),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));
    final requestsBefore = adapter.requests.length;

    // 瓦片角标文案与 chip 同名（「Processing」），按组件类型锁定 chip；
    // 390 宽下 Processing/Failed 在横向滚动区外，先滚动到位。
    final processingChip = find.widgetWithText(FilterChip, 'Processing');
    await tester.ensureVisible(processingChip);
    await tester.pumpAndSettle();
    await tester.tap(processingChip);
    await tester.pumpAndSettle();

    // 本地过滤：无新请求，仅剩处理中条目（含其角标）。
    expect(adapter.requests, hasLength(requestsBefore));
    expect(
      find.descendant(of: find.byType(StateBadge), matching: find.text('Processing')),
      findsOneWidget,
    );
    expect(find.byType(PhotoThumbnail), findsOneWidget);

    // 本地筛选无匹配 → 空筛选态。
    final failedChip = find.widgetWithText(FilterChip, 'Failed');
    await tester.ensureVisible(failedChip);
    await tester.pumpAndSettle();
    await tester.tap(failedChip);
    await tester.pumpAndSettle();
    expect(find.text('No photos match this filter'), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('空列表 → 空态；点击瓦片进入大图查看器', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (200, cursorPageBody(<Map<String, dynamic>>[]));
    });
    await pumpPhotos(tester, clientOf(adapter));
    expect(find.text('No photos yet'), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });

  testWidgets('点击瓦片 → 大图查看器（关闭返回网格）', (tester) async {
    setSurface(tester, const Size(390, 844));
    final adapter = FakeAdapter((o) {
      if (o.path != '/v1/albums/alb-1/photos') {
        throw StateError('unexpected ${o.method} ${o.path}');
      }
      return (
        200,
        cursorPageBody(<Map<String, dynamic>>[
          adminPhotoJson(photoId: 'ph-1', preview: photoPreviewJson()),
        ]),
      );
    });
    await pumpPhotos(tester, clientOf(adapter));

    await tester.tap(find.byType(PhotoThumbnail).first);
    await tester.pumpAndSettle();
    expect(find.byType(AlbumPhotoViewerPage), findsOneWidget);

    await tester.tap(find.byIcon(Icons.close));
    await tester.pumpAndSettle();
    expect(find.byType(AlbumPhotoViewerPage), findsNothing);
    expect(find.byType(AlbumPhotosPage), findsOneWidget);

    tester.view.resetPhysicalSize();
    tester.view.resetDevicePixelRatio();
  });
}

/// 网格列数（GridView delegate 断言用）。
int _columnCount(WidgetTester tester) =>
    (tester.widget<GridView>(find.byType(GridView)).gridDelegate
            as SliverGridDelegateWithFixedCrossAxisCount)
        .crossAxisCount;