/// checkDuplicatesUnified 单元测试（Task 2 评审 #1/#3）+ 选图点选拦截器
/// [PickerDuplicateGate] 五态用例（方案 A）。
///
/// 页级测试覆盖弹窗三态；本文件钉住合并语义：同一文件被本机 TaskStore
/// 与服务器历史同时命中 → 单条结果（不重复呈现）且本地 uploadedAt 优先。
/// 经 Consumer 捕获 WidgetRef 驱动真实函数——drift/文件 stat 均真实异步，
/// 整体跑在 runAsync（真实事件循环）窗口内（同页级测试的 real-io 模式；
/// fake-async 区内不做真实异步 IO）。
///
/// 拦截器用例直接构造 [PickerDuplicateGate]（构造注入真实内存 TaskStore +
/// dio 打桩 ApiClient，同 checkDuplicatesUnified 的替身面）；资产事实用
/// [PickerAssetFact] 记录绕开 AssetEntity.fileSize 的平台通道。
library;

import 'dart:async';
import 'dart:io';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart'
    show BuildContext, Builder, MaterialApp, Scaffold, ScaffoldMessenger,
    SnackBar;
import 'package:flutter/widgets.dart' show SizedBox;
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/session_store.dart';
import 'package:photo_live/features/uploads/enqueue.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 '../../helpers/fakes.dart';

/// JPEG 魔数最小字节（同页级测试）。
const List<int> kJpgBytes = <int>[
  0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00,
];

void main() {
  testWidgets('本机∪服务器：同文件双命中 → 单条结果 + sourcePath + 本地时间优先',
      (tester) async {
    final session = FakeSessionStore()
      ..session = Session(
        token: 'tok-1',
        expiresAt: DateTime.utc(2099, 1, 1),
        account: 'alice',
      );
    final store = TaskStore.memory();
    final tmp = Directory.systemTemp.createTempSync('enqueue-test-');
    addTearDown(() async {
      await store.close();
      try {
        tmp.deleteSync(recursive: true);
      } on Object {
        // Windows 句柄残留容忍（同页级测试）。
      }
    });

    // 层 2 命中源：服务器预检命中 pick1（index 0；uploadedAt 早于本地）。
    final adapter = FakeAdapter(
      (o) => (
        200,
        {
          'duplicates': [
            {
              'index': 0,
              'bytes': kJpgBytes.length,
              'uploadedAt': '2020-01-01T00:00:00Z',
            },
          ],
        },
      ),
    );
    final client = ApiClient(
      sessionStore: session,
      dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
        ..httpClientAdapter = adapter,
    );

    late WidgetRef capturedRef;
    await tester.pumpWidget(
      ProviderScope(
        overrides: [
          ...pageTestOverrides(
            session: session,
            taskStore: store,
            client: client,
          ),
        ],
        child: Consumer(
          builder: (context, ref, _) {
            capturedRef = ref;
            return const SizedBox();
          },
        ),
      ),
    );

    // 本批照片（同步写盘；pick2 字节不同 = 两层的非命中）。
    final pick1 = File('${tmp.path}/pick1.jpg')..writeAsBytesSync(kJpgBytes);
    final pick2 = File('${tmp.path}/pick2.jpg')
      ..writeAsBytesSync([...kJpgBytes, 0x00]);

    // 层 1 命中源 + 统一查重：真实异步链整体在真实事件循环内完成。
    final seededAt = DateTime.utc(2026, 9, 20, 12);
    late final DateTime seedCreatedAt;
    late List<DuplicateMatch>? result;
    await tester.runAsync(() async {
      final seed = await store.create(
        UploadTaskDraft(
          id: 'task-seed',
          accountId: 'alice',
          albumId: 'alb-1',
          clientTaskId: 'ct-seed',
          sourceFilePath: '${tmp.path}/seed.jpg',
          filename: 'pick1.jpg',
          bytes: kJpgBytes.length,
          contentType: 'image/jpeg',
        ),
        now: seededAt,
      );
      for (final state in [
        UploadTaskState.queued,
        UploadTaskState.uploading,
        UploadTaskState.uploadedConfirming,
        UploadTaskState.completed,
      ]) {
        await store.updateState(seed.id, state);
      }
      seedCreatedAt = seed.createdAt;

      result = await checkDuplicatesUnified(
        capturedRef,
        accountId: 'alice',
        albumId: 'alb-1',
        sourcePaths: [pick1.path, pick2.path],
      );
    });

    expect(result, isNotNull, reason: '双命中至少一条');
    final matches = result!;
    expect(
        matches, hasLength(1), reason: '同一文件本地+服务器双命中合并为单条（不重复呈现）');
    expect(
      matches.single.sourcePath,
      pick1.path,
      reason: '重复项携带完整源路径（路径精确派生 dupPaths 的依据）',
    );
    expect(
      matches.single.uploadedAt,
      seedCreatedAt,
      reason: '本地历史时间优先（服务器回显 2020 不覆盖本地 2026-09-20）',
    );
    expect(
      adapter.requests,
      hasLength(1),
      reason: '服务器预检发起（≤500 项单请求）',
    );
    expect(
      (adapter.requests.single.body as Map<String, dynamic>)['items'],
      hasLength(2),
      reason: '两张均送预检（含本地已命中的那张——union 语义不做短路）',
    );
  });

  group('选图点选拦截器 PickerDuplicateGate（方案 A）', () {
    /// 宿主树：MaterialApp（含根 ScaffoldMessenger + l10n）——SnackBar 提示
    /// 与文案断言的载体；测试环境默认 en locale（同页级测试）。
    Future<void> pumpGateHost(
      WidgetTester tester,
      void Function(BuildContext) capture,
    ) async {
      await tester.pumpWidget(
        MaterialApp(
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          home: Scaffold(
            body: Builder(
              builder: (context) {
                capture(context);
                return const SizedBox();
              },
            ),
          ),
        ),
      );
    }

    /// 测试资产事实（fileSize 惰性求值——gate 缓存未命中才调用）。
    PickerAssetFact gateAsset({
      String id = 'asset-1',
      String? title = 'pick1.jpg',
      required int bytes,
    }) =>
        (
          id: id,
          title: title,
          fileSize: () async => bytes,
        );

    /// 种子：同账号+相册的已完成任务（本机半场命中源；runAsync 区内调用）。
    Future<void> seedCompletedTask(
      TaskStore store,
      String filename,
      int bytes,
    ) async {
      final seed = await store.create(
        UploadTaskDraft(
          id: 'task-seed',
          accountId: 'alice',
          albumId: 'alb-1',
          clientTaskId: 'ct-seed',
          sourceFilePath: '/tmp/seed.jpg',
          filename: filename,
          bytes: bytes,
          contentType: 'image/jpeg',
        ),
      );
      for (final state in [
        UploadTaskState.queued,
        UploadTaskState.uploading,
        UploadTaskState.uploadedConfirming,
        UploadTaskState.completed,
      ]) {
        await store.updateState(seed.id, state);
      }
    }

    /// 拦截提示收尾：等 SnackBar 挂载 → 断言由调用方完成 → 隐藏并冲刷，
    /// 避免 4s 自动关闭 timer 残留到 testWidgets 收尾。
    Future<void> drainBlockedSnackBar(WidgetTester tester, BuildContext ctx) async {
      await tester.pump();
      ScaffoldMessenger.of(ctx).hideCurrentSnackBar();
      await tester.pumpAndSettle();
    }

    testWidgets('① 本机命中 → 首次拒选+提示；二次点击强制放行；本机命中短路服务器预检',
        (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      // 服务器半场打桩为空命中（若被调用则请求被记录——本机命中应短路）。
      final adapter = FakeAdapter(
        (o) => (200, {'duplicates': <Map<String, dynamic>>[]}),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );
      final asset = gateAsset(bytes: kJpgBytes.length);

      late bool first;
      late bool second;
      await tester.runAsync(() async {
        await seedCompletedTask(store, 'pick1.jpg', kJpgBytes.length);
        first = await gate.decideFact(ctx, asset, false);
        second = await gate.decideFact(ctx, asset, false);
      });

      expect(first, isFalse, reason: '本机历史命中 → 首次点选拦下');
      expect(second, isTrue, reason: '二次点击同一张 → 强制选择（escape hatch）');
      expect(adapter.requests, isEmpty,
          reason: '本机命中短路服务器单项预检（点选延迟考量）');

      // 拦截提示：谓词 ctx 经根 messenger 呈现 SnackBar（en 文案）。
      await tester.pump();
      expect(find.byType(SnackBar), findsOneWidget);
      expect(
        find.text(
          'Already uploaded to this album — tap again to select anyway',
        ),
        findsOneWidget,
      );

      // 不堆积：快速点另一个重复资产 → 旧条清除后只留一条（无 N×4s 队列）。
      late bool otherBlocked;
      await tester.runAsync(() async {
        otherBlocked = await gate.decideFact(
          ctx,
          gateAsset(id: 'asset-2', bytes: kJpgBytes.length),
          false,
        );
      });
      expect(otherBlocked, isFalse, reason: '另一重复资产同样拦下');
      await tester.pumpAndSettle();
      expect(
        find.text(
          'Already uploaded to this album — tap again to select anyway',
        ),
        findsOneWidget,
        reason: '呈现前清旧条——当前仅一条提示',
      );
      ScaffoldMessenger.of(ctx).hideCurrentSnackBar();
      await tester.pumpAndSettle();
      expect(
        find.text(
          'Already uploaded to this album — tap again to select anyway',
        ),
        findsNothing,
        reason: '隐藏后无第二条在队列等待（不堆积）',
      );
    });

    testWidgets('② 服务器单项命中 → 拒选（单项请求携带 filename+bytes）',
        (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      // 本机无历史；服务器预检回 index=0 命中（本批仅此一项）。
      final adapter = FakeAdapter(
        (o) => (
          200,
          {
            'duplicates': [
              {
                'index': 0,
                'bytes': kJpgBytes.length,
                'uploadedAt': '2026-01-01T00:00:00Z',
              },
            ],
          },
        ),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );

      late bool first;
      await tester.runAsync(() async {
        first = await gate.decideFact(
          ctx,
          gateAsset(bytes: kJpgBytes.length),
          false,
        );
      });

      expect(first, isFalse, reason: '服务器历史命中 → 拒选');
      expect(adapter.requests, hasLength(1), reason: '单项预检恰好一次');
      final body = adapter.requests.single.body as Map<String, dynamic>;
      expect(body['items'], hasLength(1));
      expect(
        (body['items'] as List<Object?>).single,
        {'filename': 'pick1.jpg', 'bytes': kJpgBytes.length},
        reason: '请求条目 = asset.title + 文件字节数',
      );
      await drainBlockedSnackBar(tester, ctx);
    });

    testWidgets('③ 两路皆空 → 放行（判定缓存：二次调用不再发预检）',
        (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      final adapter = FakeAdapter(
        (o) => (200, {'duplicates': <Map<String, dynamic>>[]}),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );

      late bool first;
      late bool second;
      await tester.runAsync(() async {
        first = await gate.decideFact(
          ctx,
          gateAsset(bytes: kJpgBytes.length),
          false,
        );
        second = await gate.decideFact(
          ctx,
          gateAsset(bytes: kJpgBytes.length),
          false,
        );
      });

      expect(first, isTrue, reason: '本机/服务器均无历史 → 放行');
      expect(second, isTrue, reason: '缓存判定直接放行');
      expect(adapter.requests, hasLength(1),
          reason: '同一资产二次点选用缓存，不重复预检');
    });

    testWidgets('④ 服务器预检异常 → 放行（预检故障不挡选图）', (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      // 本机无历史 + 服务器半场抛错（网络/权限等任意异常）。
      final adapter = FakeAdapter(
        (_) => throw StateError('预检失败'),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );

      late bool verdict;
      await tester.runAsync(() async {
        verdict = await gate.decideFact(
          ctx,
          gateAsset(bytes: kJpgBytes.length),
          false,
        );
      });

      expect(verdict, isTrue,
          reason: '预检异常放行——enqueue 弹窗 + init 409 仍是兜底');
      expect(adapter.requests, hasLength(1));
    });

    testWidgets('⑤ 取消选择恒放行（不预热放行集，不发起查询）', (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      final adapter = FakeAdapter(
        (o) => (200, {'duplicates': <Map<String, dynamic>>[]}),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );
      final asset = gateAsset(bytes: kJpgBytes.length);

      late bool deselect;
      late bool reselect;
      await tester.runAsync(() async {
        await seedCompletedTask(store, 'pick1.jpg', kJpgBytes.length);
        deselect = await gate.decideFact(ctx, asset, true);
        reselect = await gate.decideFact(ctx, asset, false);
      });

      expect(deselect, isTrue, reason: '取消选择（selected=true）恒放行');
      expect(reselect, isFalse,
          reason: '取消选择不预热放行集——再点选仍按重复拦截');
      expect(adapter.requests, isEmpty,
          reason: '取消选择路径不发起任何查询（本机命中也短路服务器）');
      await drainBlockedSnackBar(tester, ctx);
    });

    testWidgets('⑥ 服务器预检超时（注入 50ms 帽）→ 放行（时间帽=无命中）',
        (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      // 永不回包的适配器：请求受理但响应挂起（模拟弱网下预检吊住——
      // 不等 dio 默认超时，靠注入的短时间帽放行）。
      final neverResponds = Completer<(int, Object?)>();
      final adapter = FakeAdapter((o) => neverResponds.future);
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
        serverCheckTimeout: const Duration(milliseconds: 50),
      );

      late bool verdict;
      await tester.runAsync(() async {
        verdict = await gate.decideFact(
          ctx,
          gateAsset(bytes: kJpgBytes.length),
          false,
        );
      });

      expect(verdict, isTrue, reason: '超时=无命中 → 放行（绝不吊起点选）');
      expect(adapter.requests, hasLength(1), reason: '预检确已发出（只是没回）');
    });

    testWidgets('⑦ fileSize 获取失败 → 放行（预检故障不挡选图）',
        (tester) async {
      final session = FakeSessionStore()
        ..session = Session(
          token: 'tok-1',
          expiresAt: DateTime.utc(2099, 1, 1),
          account: 'alice',
        );
      final store = TaskStore.memory();
      addTearDown(() => store.close());
      final adapter = FakeAdapter(
        (o) => (200, {'duplicates': <Map<String, dynamic>>[]}),
      );
      final client = ApiClient(
        sessionStore: session,
        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
          ..httpClientAdapter = adapter,
      );

      late BuildContext ctx;
      await pumpGateHost(tester, (c) => ctx = c);
      final gate = PickerDuplicateGate(
        store: store,
        client: client,
        accountId: 'alice',
        albumId: 'alb-1',
      );

      late bool verdict;
      await tester.runAsync(() async {
        verdict = await gate.decideFact(
          ctx,
          (
            id: 'asset-1',
            title: 'pick1.jpg',
            fileSize: () async => throw StateError('size failed'),
          ),
          false,
        );
      });

      expect(verdict, isTrue, reason: 'fileSize 失败 → 放行');
      expect(adapter.requests, isEmpty,
          reason: 'fileSize 失败短路两半场——不发起任何查询');
    });
  });
}