/// P3 Task 11 集成测试 · 后台延续与杀进程恢复（A04/A05，模拟器级）。
///
/// 由 `scripts/run-mobile-it.sh --background` 编排，两阶段经
/// `--dart-define IT_PHASE=` 区分（App 无法自己 HOME/杀自己——设备动作
/// 由脚本在见到 MARKER 后执行，属计划明示的 adb 编排场景）：
///
/// - **prepare**：登录（本次运行专属账号）→ API 建相册 → 直接经准备器
///   入队 2 张大图（~15MB，保证传输有可被中断的时间窗）→ 等任务进入
///   uploading → 打 `MARKER:UPLOADING`（脚本此刻 HOME 或 force-stop）→
///   就地等待全部 completed（HOME 场景：WorkManager 后台续传完成后本
///   测试自然通过；KILL 场景：进程被杀，本测试非零退出是预期）。
/// - **verify**：全新进程登录同账号 → 断言 2 张全部 completed（KILL 场景
///   覆盖 A05：drift 任务库持久 + 崩溃恢复 uploading→waitingNetwork→
///   幂等重传）→ 服务端历史可见。
library;

import 'package:flutter/foundation.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';
import 'package:photo_live/core/api_client.dart';
import 'package:photo_live/features/albums/models.dart';
import 'package:photo_live/features/uploads/models.dart';
import 'package:photo_live/features/uploads/providers.dart';
import 'package:photo_live/features/uploads/task_state.dart';

import 'helpers/app_boot.dart';
import 'helpers/it_config.dart';
import 'helpers/ui_steps.dart';

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
  final phase = const String.fromEnvironment('IT_PHASE', defaultValue: '');
  if (phase.isEmpty) {
    fail('缺少 --dart-define IT_PHASE=prepare|verify（经 run-mobile-it.sh 运行）');
  }
  final harness = ItAppHarness.create();

  testWidgets(
    'P3 后台延续/杀进程恢复 [$phase]',
    (tester) async {
      final account = ItConfig.mainAccount;

      if (phase == 'prepare') {
        await tester.pumpWidget(harness.appWidget());
        await loginViaUi(tester, account, ItConfig.mainPassword);

        // 相册走 API（建相册的 UI 驱动已在主流程覆盖；本场景主题是传输）。
        final api = harness.container.read(apiClientProvider);
        final album = await api.createAlbum(
          AlbumCreateRequest(
            translations: [
              AlbumTranslation(
                locale: 'zh-CN',
                title: '后台测试相册 ${ItConfig.runStamp}',
              ),
              AlbumTranslation(
                locale: 'en',
                title: 'BG Album ${ItConfig.runStamp}',
              ),
            ],
            defaultLocale: 'zh-CN',
            startAt: DateTime.now().toUtc(),
          ),
        );
        debugPrint('[IT] 后台场景相册：${album.id}');

        // 大图经准备器直接入队（选图 UI 已在主流程覆盖）。
        final support = await getApplicationSupportDirectory();
        final dir = await resolveImageDir(support.path);
        final largeFiles = [ItConfig.largeFileA, ItConfig.largeFileB]
            .map((name) => p.join(dir, name))
            .toList();
        for (final file in largeFiles) {
          final task = await harness
              .container
              .read(uploadPreparerProvider)
              .prepare(
                accountId: account,
                albumId: album.id,
                sourcePath: file,
              );
          expect(task.state, UploadTaskState.queued, reason: '入队 $file');
        }
        debugPrint('[IT] 2 张大图已入队：$largeFiles');

        // 等首个任务进入 uploading（引擎已领取、原生桥接已注册）。
        await pollUntil<Map<UploadTaskState, int>>(
          tester,
          () => queueSnapshot(harness, account),
          (counts) =>
              (counts[UploadTaskState.uploading] ?? 0) >= 1 ||
              (counts[UploadTaskState.uploadedConfirming] ?? 0) >= 1 ||
              (counts[UploadTaskState.completed] ?? 0) >= 1,
          timeout: const Duration(seconds: 60),
          because: '任务进入传输中（脚本随后执行 HOME/force-stop）',
        );
        // 脚本协调点：轮询本行出现在 flutter test 输出后立即动作。
        debugPrint('[IT] MARKER:UPLOADING');

        // HOME 场景：后台完成 → 本断言通过；KILL 场景：进程死于此循环
        // （非零退出是预期，脚本以 || true 容忍并以 verify 阶段收口）。
        await waitAllCompleted(tester, harness, account, 2);
        debugPrint('[IT] MARKER:BG_COMPLETED');
      } else if (phase == 'verify') {
        await tester.pumpWidget(harness.appWidget());
        await loginViaUi(tester, account, ItConfig.mainPassword);
        // 服务端权威判定：verify 是全新进程，测试装配的任务库为内存实例
        // （跨进程本就不共享）；设备侧真实 drift 持久化由 prepare 阶段的
        // App 进程行使。收敛断言 = 服务端 2 条 confirmed（幂等重传的最终
        // 落点，A04/A05 语义）。
        final api = harness.container.read(apiClientProvider);
        int confirmed = 0;
        final deadline = DateTime.now().add(const Duration(minutes: 3));
        while (DateTime.now().isBefore(deadline)) {
          await tester.pump();
          final page = await api.listUploads(limit: 20);
          confirmed = page.items
              .where((record) => record.state == UploadSessionState.confirmed)
              .length;
          if (confirmed >= 2) break;
          await Future<void>.delayed(const Duration(seconds: 3));
        }
        expect(confirmed, greaterThanOrEqualTo(2),
            reason: '服务端 confirmed 上传记录应 ≥2（后台/重启后收敛）');
        debugPrint('[IT] verify：服务端上传历史 $confirmed 条 confirmed OK');
      } else {
        fail('未知 IT_PHASE：$phase');
      }
    },
    timeout: const Timeout(Duration(minutes: 10)),
  );

  tearDownAll(harness.container.dispose);
}