/// checkDuplicatesUnified 单元测试（Task 2 评审 #1/#3）。
///
/// 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）。
library;

import 'dart:io';

import 'package:dio/dio.dart';
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 '../../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）',
    );
  });
}