/// 连拍页 widget 测试（UI-03 页面 13 深色摄影界面；R17 连拍入队 / O01）。
///
/// 打桩面：FakeCaptureSource（capture 返回真实 JPEG 临时文件，无相机
/// 平台通道；可注入闪光灯能力/记录翻转释放）+ 内存 TaskStore + 临时目录
/// 准备器 + 非 Android 权限门替身。覆盖：快门即拍即入队、连拍串行、分类
/// 切换仅影响之后拍摄、多选补充入队、待传/失败徽章实时刷新、有待传任务
/// 退出确认、权限拒绝/初始化失败视图与重试、深色界面（#10161E）、快门
/// ≥72dp、闪光灯按能力显示、前后摄切换重建、最近一张缩略图。
library;

import 'dart:io';

import 'package:camera/camera.dart' show CameraException, XFile;
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/notification_permission.dart';
import 'package:photo_live/core/session_store.dart';
import 'package:photo_live/features/albums/models.dart';
import 'package:photo_live/features/uploads/enqueue.dart';
import 'package:photo_live/features/uploads/preparer.dart';
import 'package:photo_live/features/uploads/providers.dart';
import 'package:photo_live/features/uploads/queue_controller.dart';
import 'package:photo_live/features/uploads/task_state.dart';
import 'package:photo_live/features/uploads/task_store.dart';
import 'package:photo_live/l10n/app_localizations.dart';
import 'package:photo_live/pages/capture_page.dart';
import 'package:photo_live/ui/tokens.dart';

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

const List<int> kJpgBytes = <int>[
  0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00,
];

/// 拍摄源替身：capture 依次弹出预置文件；initialize 可注入失败次数；
/// 闪光灯能力可注入（记录开关调用）；释放计数供前后切换断言。
class FakeCaptureSource extends CaptureSource {
  FakeCaptureSource(this._files);

  final List<File> _files;
  int initializeCalls = 0;
  int failNextInits = 0;
  Object? initError;

  /// 闪光灯能力（默认不支持——UI 不显示开关）。
  bool flashSupported = false;
  final List<bool> flashCalls = <bool>[];

  /// dispose 计数（前后摄切换释放断言）。
  int disposeCalls = 0;

  @override
  Future<void> initialize() async {
    initializeCalls++;
    if (failNextInits > 0) {
      failNextInits--;
      throw initError ?? StateError('init failed');
    }
  }

  @override
  Future<XFile> capture() async => XFile(_files.removeAt(0).path);

  @override
  Widget buildPreview() => const ColoredBox(
        color: Color(0xFF101010),
        child: Center(child: Text('PREVIEW_MARK')),
      );

  @override
  bool get supportsFlash => flashSupported;

  @override
  Future<void> setFlashEnabled(bool enabled) async =>
      flashCalls.add(enabled);

  @override
  Future<void> dispose() async => disposeCalls++;
}

void main() {
  late FakeSessionStore session;
  late TaskStore store;
  late Directory tmp;
  late FakeCaptureSource source;
  late List<String> galleryPaths;

  /// 工厂调用记录（前后摄切换断言）。
  late List<bool> factoryPreferFront;

  final categories = <Category>[
    const Category(
      id: 'cat-1',
      albumId: 'alb-1',
      sortOrder: 0,
      translations: [
        CategoryTranslation(locale: 'zh-CN', name: '仪式'),
        CategoryTranslation(locale: 'en', name: 'Ceremony'),
      ],
    ),
    const Category(
      id: 'cat-2',
      albumId: 'alb-1',
      sortOrder: 1,
      translations: [
        CategoryTranslation(locale: 'zh-CN', name: '晚宴'),
        CategoryTranslation(locale: 'en', name: 'Gala'),
      ],
    ),
  ];

  setUp(() async {
    session = FakeSessionStore()
      ..session = Session(
        token: 'tok-1',
        expiresAt: DateTime.utc(2099, 1, 1),
        account: 'alice',
      );
    store = TaskStore.memory();
    tmp = await Directory.systemTemp.createTemp('capture-test-');
    final shot1 = File('${tmp.path}/IMG_0001.jpg')..writeAsBytesSync(kJpgBytes);
    final shot2 = File('${tmp.path}/IMG_0002.jpg')..writeAsBytesSync(kJpgBytes);
    final shot3 = File('${tmp.path}/IMG_0003.jpg')..writeAsBytesSync(kJpgBytes);
    source = FakeCaptureSource([shot1, shot2, shot3]);
    galleryPaths = <String>[];
    factoryPreferFront = <bool>[];
  });

  tearDown(() async {
    await store.close();
    try {
      await tmp.delete(recursive: true);
    } on Object {
      // Windows：底部缩略图 FileImage 的异步读取可能仍持有临时文件句柄
      //（fake-async 区内真实 IO 完成回调不被冲刷）——删除失败不判定
      // 业务断言失败，残留目录交由系统临时目录清理。
    }
  });

  CaptureTarget target() => CaptureTarget(
        accountId: 'alice',
        albumId: 'alb-1',
        albumTitle: 'Opening Gala',
        categories: categories,
      );

  Future<void> pumpCapture(WidgetTester tester) async {
    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          ...pageTestOverrides(
            session: session,
            taskStore: store,
            client: ApiClient(
              sessionStore: session,
              dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
                ..httpClientAdapter = FakeAdapter(
                    (_) => throw StateError('连拍页不应发起 API 请求')),
            ),
          ),
          captureSourceFactoryProvider.overrideWith(
            (ref) => ({bool preferFront = false}) async {
              factoryPreferFront.add(preferFront);
              return source;
            },
          ),
          uploadPreparerProvider.overrideWith(
            (ref) => UploadPreparer(
              store,
              baseDirProvider: () async => tmp,
            ),
          ),
          notificationPermissionProvider.overrideWith(
            (ref) => NotificationPermission(isAndroid: false),
          ),
          multiImagePickerProvider
              .overrideWith((ref) => () async => galleryPaths),
        ],
        child: MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: CapturePage(target: target()),
        ),
      ),
    );
    // 相机初始化完成：帧级 pump 直至预览出现（首个测试字体/主题冷启动
    // 较慢，固定双 pump 不够稳）。
    await tester.pump();
    var guard = 0;
    while (find.text('PREVIEW_MARK').evaluate().isEmpty && guard++ < 20) {
      await tester.pump(const Duration(milliseconds: 50));
    }
  }

  /// 触发一个会走真实文件 IO 的按钮：在 runAsync（真实事件循环）内直接
  /// 调用其回调——widget 测试的 fake-async 区里 dart:io 完成回调不会被
  /// pump 冲刷，入队链路必须整体跑在真实区；返回后 pump 刷新徽章防抖。
  Future<void> pressRealIo(WidgetTester tester, IconData icon) async {
    final button = find
        .ancestor(of: find.byIcon(icon), matching: find.byType(IconButton))
        .evaluate()
        .single
        .widget as IconButton;
    await tester.runAsync(() async {
      button.onPressed!();
      await Future<void>.delayed(const Duration(milliseconds: 300));
    });
    await tester.pump(kQueueRefreshDebounce);
    await tester.pump(const Duration(milliseconds: 60));
  }

  /// 快门（即拍即入队链路经 [pressRealIo]）。
  Future<void> shoot(WidgetTester tester, {int times = 1}) async {
    for (var i = 0; i < times; i++) {
      await pressRealIo(tester, Icons.camera);
    }
  }

  testWidgets('深色摄影界面：页面背景 #10161E（不随主题）', (tester) async {
    await pumpCapture(tester);
    expect(
      tester.widget<Scaffold>(find.byType(Scaffold)).backgroundColor,
      kColorPhotoBackdrop,
      reason: '§3 相机界面固定深色背景',
    );
  });

  testWidgets('快门 ≥72dp（§4 页面 13）+ 相机控制齐备', (tester) async {
    await pumpCapture(tester);

    final shutterSize = tester.getSize(find.byKey(const ValueKey('capture-shutter')));
    expect(shutterSize.width, greaterThanOrEqualTo(72));
    expect(shutterSize.height, greaterThanOrEqualTo(72));

    // 前后摄切换 + 相册入口（缩略图占位）常驻；闪光灯未注入能力不出现。
    expect(find.byIcon(Icons.flip_camera_ios_outlined), findsOneWidget);
    expect(find.byIcon(Icons.photo_library_outlined), findsOneWidget);
    expect(find.byIcon(Icons.flash_off), findsNothing,
        reason: '源不支持闪光灯时不显示开关');
  });

  testWidgets('快门即拍即入队：任务落库 queued + 顶栏待传徽章 1', (tester) async {
    await pumpCapture(tester);
    expect(find.text('PREVIEW_MARK'), findsOneWidget, reason: '相机预览就绪');
    expect(find.text('0 queued'), findsOneWidget);

    await shoot(tester);

    final tasks = await store.listByAccount('alice');
    expect(tasks, hasLength(1));
    expect(tasks.single.state, UploadTaskState.queued);
    expect(tasks.single.accountId, 'alice');
    expect(tasks.single.albumId, 'alb-1');
    expect(tasks.single.categoryId, isNull, reason: '默认分类');
    expect(tasks.single.filename, 'IMG_0001.jpg');
    expect(find.text('1 queued'), findsOneWidget, reason: '徽章实时刷新');
  });

  testWidgets('最近一张缩略图：拍摄前为相册占位，拍摄后显示照片',
      (tester) async {
    await pumpCapture(tester);
    expect(find.byType(Image), findsNothing, reason: '拍摄前无缩略图');

    await shoot(tester);

    expect(
      find.byType(Image),
      findsOneWidget,
      reason: '拍摄后底部显示最近一张（缩略图位）',
    );
  });

  testWidgets('入队成功反馈：短暂浮层出现（不逐张弹确认，§4.5）',
      (tester) async {
    await pumpCapture(tester);

    // 与 pressRealIo 同法但缩短真实等待（80ms < 200ms 反馈窗）：入队链路
    // 完成时浮层已翻转、计时器未到期，可在窗内断言不透明度 > 0。
    final button = find
        .ancestor(of: find.byIcon(Icons.camera), matching: find.byType(IconButton))
        .evaluate()
        .single
        .widget as IconButton;
    await tester.runAsync(() async {
      button.onPressed!();
      await Future<void>.delayed(const Duration(milliseconds: 80));
    });
    await tester.pump(const Duration(milliseconds: 180));

    // 反馈浮层淡入完成（AnimatedOpacity → 1），文案为「已加入队列」。
    expect(
      tester.widget<AnimatedOpacity>(find.byType(AnimatedOpacity).first).opacity,
      greaterThan(0),
      reason: '200ms 反馈窗内浮层可见',
    );
    expect(find.text('Added to queue'), findsOneWidget);
    // 等待 200ms 反馈计时器在真实事件循环中到期，避免悬挂计时器；随后
    // fake pump 冲刷淡出动画帧。
    await tester.runAsync(
      () async => Future<void>.delayed(const Duration(milliseconds: 250)),
    );
    await tester.pump(const Duration(milliseconds: 400));
  });

  testWidgets('连拍两张串行入队（不逐张确认）', (tester) async {
    await pumpCapture(tester);

    await shoot(tester, times: 2);

    final tasks = await store.listByAccount('alice');
    expect(tasks.map((t) => t.filename), unorderedEquals(<String>[
      'IMG_0001.jpg',
      'IMG_0002.jpg',
    ]));
    expect(find.text('2 queued'), findsOneWidget);
  });

  testWidgets('闪光灯：源支持才显示；点击开→关记录调用', (tester) async {
    source.flashSupported = true;
    await pumpCapture(tester);

    expect(find.byIcon(Icons.flash_off), findsOneWidget, reason: '默认关');
    await tester.tap(find.byIcon(Icons.flash_off));
    await tester.pump();

    expect(source.flashCalls, [true]);
    expect(find.byIcon(Icons.flash_on), findsOneWidget, reason: '开启后图标翻转');
  });

  testWidgets('前后摄切换：释放当前源 → 反向重建（工厂收 preferFront）',
      (tester) async {
    await pumpCapture(tester);
    expect(factoryPreferFront, [false]);

    await tester.tap(find.byIcon(Icons.flip_camera_ios_outlined));
    await tester.pump();
    var guard = 0;
    while (find.text('PREVIEW_MARK').evaluate().isEmpty && guard++ < 20) {
      await tester.pump(const Duration(milliseconds: 50));
    }

    expect(source.disposeCalls, 1, reason: '旧源已释放（相机生命周期）');
    expect(factoryPreferFront, [false, true], reason: '反向重建');
    expect(find.text('PREVIEW_MARK'), findsOneWidget, reason: '预览恢复');
  });

  testWidgets('分类切换：hint 提示 + 仅影响之后拍摄（A15 归属不变）',
      (tester) async {
    await pumpCapture(tester);
    await shoot(tester); // 第一张：默认分类。

    await tester.tap(find.text('Gala'));
    await tester.pump();
    expect(
      find.text('Switching only affects photos captured afterwards'),
      findsOneWidget,
      reason: '切换归属不变提示',
    );
    await tester.pumpAndSettle(); // snackbar 退场。

    await shoot(tester); // 第二张：新分类。

    final tasks = await store.listByAccount('alice');
    final first =
        tasks.firstWhere((t) => t.filename == 'IMG_0001.jpg');
    final second =
        tasks.firstWhere((t) => t.filename == 'IMG_0002.jpg');
    expect(first.categoryId, isNull, reason: '既有任务归属不变');
    expect(second.categoryId, 'cat-2', reason: '切换后拍摄走新分类');
  });

  testWidgets('相册多选补充入队 → 入队数提示', (tester) async {
    final pick1 = File('${tmp.path}/pick1.jpg')..writeAsBytesSync(kJpgBytes);
    final pick2 = File('${tmp.path}/pick2.jpg')..writeAsBytesSync(kJpgBytes);
    galleryPaths.addAll([pick1.path, pick2.path]);
    await pumpCapture(tester);

    // 多选入队走真实文件 IO（同快门路径）。
    await pressRealIo(tester, Icons.photo_library_outlined);
    await tester.pump(const Duration(milliseconds: 100));

    expect(find.text('Added 2 photo(s) to the upload queue'), findsOneWidget);
    expect(await store.listByAccount('alice'), hasLength(2));
  });

  testWidgets('退出确认：有待传任务 → 弹确认；保留继续拍 / 确认才退出',
      (tester) async {
    await pumpCapture(tester);
    expect(find.byType(CapturePage), findsOneWidget);

    await shoot(tester);

    // home 路由无返回按钮——经 Navigator.maybePop 驱动系统返回路径
    //（PopScope.canPop=false → onPopInvokedWithResult 弹确认）。
    Future<void> requestBack() async {
      final navigator = tester.state<NavigatorState>(
        find.byType(Navigator).first,
      );
      await navigator.maybePop();
      await tester.pumpAndSettle();
    }

    // 有待传 → 弹确认。
    await requestBack();
    expect(find.text('Leave shooting?'), findsOneWidget);
    expect(
      find.textContaining('still uploading'),
      findsOneWidget,
      reason: '正文含待传数与后台继续说明',
    );

    // 保留继续拍 → 不退出。
    await tester.tap(find.text('Keep shooting'));
    await tester.pumpAndSettle();
    expect(find.byType(CapturePage), findsOneWidget);

    // 再次退出 → 确认离开 → 出栈。
    await requestBack();
    await tester.tap(find.text('Leave'));
    await tester.pumpAndSettle();
    expect(find.byType(CapturePage), findsNothing);
  });

  testWidgets('权限拒绝视图：文案 + 重试入口', (tester) async {
    source.initError = CameraException('CameraAccessDenied', 'denied');
    source.failNextInits = 1;
    await pumpCapture(tester);

    expect(
      find.text(
          'Camera unavailable. Allow camera access in system settings'),
      findsOneWidget,
    );
    // 重试成功 → 预览就绪。
    await tester.tap(find.text('Retry'));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 50));
    expect(find.text('PREVIEW_MARK'), findsOneWidget);
  });

  testWidgets('初始化失败视图：非权限异常文案 + 重试恢复', (tester) async {
    source.failNextInits = 1;
    source.initError = StateError('camera broken');
    await pumpCapture(tester);

    expect(find.text('Camera failed to initialize'), findsOneWidget);

    await tester.tap(find.text('Retry'));
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 50));
    expect(find.text('PREVIEW_MARK'), findsOneWidget);
  });

  testWidgets('常驻信息层：相册名 + 分类候选', (tester) async {
    await pumpCapture(tester);

    expect(find.text('Opening Gala'), findsOneWidget);
    expect(find.text('Default category'), findsOneWidget);
    expect(find.text('Ceremony'), findsOneWidget);
    expect(find.text('Gala'), findsOneWidget);
  });
}