/// 上传任务库（TaskStore）测试（P3 计划 Task 5）。
///
/// 内存库（drift NativeDatabase.memory）驱动，覆盖：
/// - CRUD 与幂等键（clientTaskId 同账号同相册唯一，应用侧校验）；
/// - 状态迁移守护（updateState 非法迁移拒绝且不落库）；
/// - 账号隔离硬守护（读路径无条件 accountId 过滤）；
/// - 列表筛选（相册/状态/时间）与 FIFO 排序；
/// - countsByState（队列 UI 徽章）；
/// - 源文件保留策略（cleanupCandidates 仅终态+过期；未完成永不清理——
///   评审缺口 1 的硬守护测试）；
/// - datetime 文本落库的亚秒精度。
library;

import 'package:flutter_test/flutter_test.dart';
import 'package:photo_live/features/uploads/task_state.dart';
import 'package:photo_live/features/uploads/task_store.dart';

/// 可覆盖默认值的 draft 构造器。
UploadTaskDraft draft({
  String id = 'task-0001',
  String accountId = 'alice',
  String albumId = 'alb-1',
  String? categoryId,
  String clientTaskId = 'ct-0001',
  String sourceFilePath = '/managed/uploads/alb-1/task-0001.jpg',
  String filename = 'IMG_0001.jpg',
  int bytes = 1024,
  String contentType = 'image/jpeg',
}) {
  return UploadTaskDraft(
    id: id,
    accountId: accountId,
    albumId: albumId,
    categoryId: categoryId,
    clientTaskId: clientTaskId,
    sourceFilePath: sourceFilePath,
    filename: filename,
    bytes: bytes,
    contentType: contentType,
  );
}

/// 将任务沿合法路径推进到目标状态（供 cleanup/counts 测试摆数据）。
Future<UploadTask> advanceTo(
  TaskStore store,
  String id,
  UploadTaskState target, {
  DateTime? at,
}) async {
  var current = (await store.get('alice', id))!;
  const path = <UploadTaskState, List<UploadTaskState>>{
    UploadTaskState.queued: [UploadTaskState.queued],
    UploadTaskState.uploading: [UploadTaskState.queued, UploadTaskState.uploading],
    UploadTaskState.completed: [
      UploadTaskState.queued,
      UploadTaskState.uploading,
      UploadTaskState.uploadedConfirming,
      UploadTaskState.completed,
    ],
    UploadTaskState.cancelled: [UploadTaskState.cancelled],
    UploadTaskState.waitingNetwork: [
      UploadTaskState.queued,
      UploadTaskState.waitingNetwork,
    ],
    UploadTaskState.retryableFailed: [
      UploadTaskState.queued,
      UploadTaskState.uploading,
      UploadTaskState.retryableFailed,
    ],
  };
  for (final state in path[target]!) {
    current = await store.updateState(id, state, now: at);
  }
  expect(current.state, target);
  return current;
}

void main() {
  late TaskStore store;

  setUp(() {
    store = TaskStore.memory();
  });

  tearDown(() async {
    await store.close();
  });

  group('create（初始态与幂等键）', () {
    test('初始状态 preparing、attempt=0、可空字段空、时间戳落库', () async {
      final createdAt = DateTime.utc(2026, 9, 19, 1, 2, 3, 456);
      final task = await store.create(draft(), now: createdAt);

      expect(task.state, UploadTaskState.preparing);
      expect(task.attempt, 0);
      expect(task.nextRetryAt, isNull);
      expect(task.serverUploadId, isNull);
      expect(task.serverPhotoId, isNull);
      expect(task.lastError, isNull);
      expect(task.cleanedAt, isNull);
      expect(task.accountId, 'alice');
      expect(task.albumId, 'alb-1');
      expect(task.bytes, 1024);
      expect(task.createdAt, createdAt);
      expect(task.updatedAt, createdAt);
    });

    test('datetime 文本落库保住亚秒/微秒精度，且本地输入统一 UTC 落库', () async {
      final stamp = DateTime.utc(2026, 9, 19, 8, 30, 15, 123, 456);
      await store.create(draft(), now: stamp);
      final task = await store.get('alice', 'task-0001');
      expect(task!.createdAt, stamp); // 完整相等而非秒级截断
      expect(task.updatedAt, stamp);

      // 本地时区输入（DateTime.now() 非 UTC）：同一时刻、UTC 归一落库——
      // 文本存储下字典序即时间序，SQL 时间比较（since/cutoff）不因
      // `Z`/`+08:00` 后缀混存而错位。
      final local = DateTime.now();
      await store.create(draft(id: 'task-local', clientTaskId: 'ct-local'), now: local);
      final normalized = await store.get('alice', 'task-local');
      expect(normalized!.createdAt.isUtc, isTrue);
      expect(normalized.createdAt, local.toUtc());
    });

    test('同账号同相册重复 clientTaskId 拒绝（应用侧唯一性）', () async {
      await store.create(draft());
      await expectLater(
        store.create(draft(id: 'task-0002')),
        throwsA(isA<StateError>()),
      );
      // 唯一存在的仍是第一条。
      final tasks = await store.listByAccount('alice');
      expect(tasks, hasLength(1));
      expect(tasks.single.id, 'task-0001');
    });

    test('幂等键作用域=账号+相册：换相册或换账号可复用同一 clientTaskId', () async {
      await store.create(draft());
      await store.create(
        draft(id: 'task-0002', albumId: 'alb-2'),
      );
      await store.create(
        draft(id: 'task-0003', accountId: 'bob'),
      );
      expect(await store.countsByState('alice'), containsPair(
        UploadTaskState.preparing, 2));
      expect(await store.countsByState('bob'), containsPair(
        UploadTaskState.preparing, 1));
    });
  });

  group('updateState（迁移守护 + 旁路字段）', () {
    test('全生命周期推进：patch 写入 serverId/attempt/nextRetryAt/lastError 并可在成功时清除', () async {
      await store.create(draft());
      final t0 = DateTime.utc(2026, 9, 19, 9);

      final queued = await store.updateState(
        'task-0001',
        UploadTaskState.queued,
        now: t0,
      );
      expect(queued.state, UploadTaskState.queued);
      expect(queued.updatedAt, t0);

      final uploading = await store.updateState(
        'task-0001',
        UploadTaskState.uploading,
        patch: UploadTaskPatch(
          serverUploadId: 'upl-1',
          serverPhotoId: 'pho-1',
        ),
        now: t0.add(const Duration(minutes: 1)),
      );
      expect(uploading.serverUploadId, 'upl-1');
      expect(uploading.serverPhotoId, 'pho-1');

      // 核验失败 → 重试路径：attempt+1、退避时间、错误码。
      final failed = await store.updateState(
        'task-0001',
        UploadTaskState.retryableFailed,
        patch: UploadTaskPatch(
          attempt: 1,
          nextRetryAt: t0.add(const Duration(minutes: 10)),
          lastError: 'UPLOAD_VERIFY_FAILED',
        ),
        now: t0.add(const Duration(minutes: 2)),
      );
      expect(failed.attempt, 1);
      expect(failed.nextRetryAt, t0.add(const Duration(minutes: 10)));
      expect(failed.lastError, 'UPLOAD_VERIFY_FAILED');

      // 重试：retryableFailed → queued → uploading（合法路径）。
      await store.updateState(
        'task-0001',
        UploadTaskState.queued,
        now: t0.add(const Duration(minutes: 10)),
      );
      await store.updateState(
        'task-0001',
        UploadTaskState.uploading,
        now: t0.add(const Duration(minutes: 11)),
      );
      await store.updateState(
        'task-0001',
        UploadTaskState.uploadedConfirming,
        now: t0.add(const Duration(minutes: 12)),
      );
      final done = await store.updateState(
        'task-0001',
        UploadTaskState.completed,
        patch: const UploadTaskPatch(
          clearNextRetryAt: true,
          clearLastError: true,
        ),
        now: t0.add(const Duration(minutes: 13)),
      );
      expect(done.state, UploadTaskState.completed);
      expect(done.nextRetryAt, isNull);
      expect(done.lastError, isNull);
      expect(done.cleanedAt, isNull, reason: '完成不等于已清理');
    });

    test('非法迁移抛 StateError 且不落库（守护）', () async {
      final createdAt = DateTime.utc(2026, 9, 19, 9);
      await store.create(draft(), now: createdAt);
      await expectLater(
        store.updateState('task-0001', UploadTaskState.completed),
        throwsA(isA<StateError>()),
      );
      final task = await store.get('alice', 'task-0001');
      expect(task!.state, UploadTaskState.preparing);
      expect(task.updatedAt, createdAt, reason: '失败的迁移不得刷新 updatedAt');
    });

    test('终态出边一律拒绝（completed 后不可复活）', () async {
      await store.create(draft());
      await advanceTo(store, 'task-0001', UploadTaskState.completed);
      await expectLater(
        store.updateState('task-0001', UploadTaskState.queued),
        throwsA(isA<StateError>()),
      );
      expect(
        (await store.get('alice', 'task-0001'))!.state,
        UploadTaskState.completed,
      );
    });

    test('不存在的 id 抛 StateError', () async {
      await expectLater(
        store.updateState('nope', UploadTaskState.queued),
        throwsA(isA<StateError>()),
      );
    });

    test('patch 未提供的列保持不变（文档契约，引擎重试依赖）', () async {
      // 场景（Task 6 引擎）：失败写入 serverUploadId/attempt/lastError 后，
      // 后续不带这些字段的迁移不得清空它们。
      await store.create(draft());
      await store.updateState('task-0001', UploadTaskState.queued);
      await store.updateState(
        'task-0001',
        UploadTaskState.uploading,
        patch: const UploadTaskPatch(
          serverUploadId: 'upl-1',
          serverPhotoId: 'pho-1',
        ),
      );
      await store.updateState(
        'task-0001',
        UploadTaskState.waitingNetwork,
        patch: const UploadTaskPatch(
          attempt: 2,
          lastError: 'NETWORK_ERROR',
        ),
      );
      final kept = await store.updateState(
        'task-0001',
        UploadTaskState.uploading,
        now: DateTime.utc(2026, 9, 19, 10),
      );
      expect(kept.serverUploadId, 'upl-1', reason: '未提供不得清空');
      expect(kept.serverPhotoId, 'pho-1');
      expect(kept.attempt, 2);
      expect(kept.lastError, 'NETWORK_ERROR');
    });

    test('updateMeta：旁路回填不迁移状态（引擎 init 后回填会话 ID）', () async {
      await store.create(draft());
      await store.updateState('task-0001', UploadTaskState.queued);
      await store.updateState('task-0001', UploadTaskState.uploading);
      final at = DateTime.utc(2026, 9, 19, 10);
      final updated = await store.updateMeta(
        'task-0001',
        serverUploadId: 'upl-9',
        serverPhotoId: 'pho-9',
        now: at,
      );
      expect(updated.state, UploadTaskState.uploading, reason: '状态不变');
      expect(updated.serverUploadId, 'upl-9');
      expect(updated.serverPhotoId, 'pho-9');
      expect(updated.updatedAt, at);
      // 未提供的字段保持不变（二次回填只更新一个）。
      final again = await store.updateMeta('task-0001', serverUploadId: 'upl-x');
      expect(again.serverUploadId, 'upl-x');
      expect(again.serverPhotoId, 'pho-9');
    });
  });

  group('账号隔离（硬守护）', () {
    test('listByAccount/get/countsByState 均不可见他人任务', () async {
      await store.create(draft(accountId: 'alice', clientTaskId: 'ct-a'));
      await store.create(
        draft(id: 'task-b', accountId: 'bob', clientTaskId: 'ct-b'),
      );

      final aliceTasks = await store.listByAccount('alice');
      expect(aliceTasks.map((t) => t.accountId), everyElement('alice'));
      expect(aliceTasks, hasLength(1));

      // get 跨账号视同不存在。
      expect(await store.get('alice', 'task-b'), isNull);
      expect(await store.get('bob', 'task-0001'), isNull);

      // 徽章计数同样隔离。
      final bobCounts = await store.countsByState('bob');
      expect(
        bobCounts.values.fold<int>(0, (a, b) => a + b),
        1,
        reason: 'bob 只应见到自己的 1 条',
      );
    });

    test('筛选组合不放松 accountId 过滤（相册/状态条件均在其内）', () async {
      await store.create(draft(albumId: 'alb-1', clientTaskId: 'ct-1'));
      await store.create(
        draft(id: 'task-bob', accountId: 'bob', albumId: 'alb-1', clientTaskId: 'ct-1'),
      );
      final onlyAlice = await store.listByAccount(
        'alice',
        albumId: 'alb-1',
        states: const {UploadTaskState.preparing},
      );
      expect(onlyAlice, hasLength(1));
      expect(onlyAlice.single.accountId, 'alice');
    });
  });

  group('listByAccount（三维筛选 + FIFO）', () {
    test('albumId 筛选', () async {
      await store.create(draft(albumId: 'alb-1', clientTaskId: 'ct-1'));
      await store.create(
        draft(id: 'task-2', albumId: 'alb-2', clientTaskId: 'ct-2'),
      );
      final tasks =
          await store.listByAccount('alice', albumId: 'alb-2');
      expect(tasks.map((t) => t.albumId), everyElement('alb-2'));
      expect(tasks, hasLength(1));
    });

    test('states 筛选（集合内 IN）', () async {
      await store.create(draft(clientTaskId: 'ct-1'));
      await store.create(draft(id: 'task-2', clientTaskId: 'ct-2'));
      await store.create(draft(id: 'task-3', clientTaskId: 'ct-3'));
      await advanceTo(store, 'task-2', UploadTaskState.completed);
      await advanceTo(store, 'task-3', UploadTaskState.cancelled);

      final active = await store.listByAccount(
        'alice',
        states: {UploadTaskState.preparing, UploadTaskState.queued},
      );
      expect(active.map((t) => t.id), ['task-0001']);

      final terminal = await store.listByAccount(
        'alice',
        states: {UploadTaskState.completed, UploadTaskState.cancelled},
      );
      expect(terminal.map((t) => t.id).toSet(), {'task-2', 'task-3'});
    });

    test('since 时间筛选（含边界：createdAt == since 计入）', () async {
      final t0 = DateTime.utc(2026, 9, 19, 10);
      await store.create(draft(clientTaskId: 'ct-1'), now: t0);
      await store.create(
        draft(id: 'task-2', clientTaskId: 'ct-2'),
        now: t0.add(const Duration(hours: 1)),
      );
      final tasks = await store.listByAccount(
        'alice',
        since: t0.add(const Duration(hours: 1)),
      );
      expect(tasks.map((t) => t.id), ['task-2']);
    });

    test('按 createdAt 升序（队列 FIFO）+ limit', () async {
      final t0 = DateTime.utc(2026, 9, 19, 10);
      for (var i = 1; i <= 3; i++) {
        await store.create(
          draft(
            id: 'task-$i',
            clientTaskId: 'ct-$i',
          ),
          now: t0.add(Duration(minutes: i)),
        );
      }
      final tasks = await store.listByAccount('alice');
      expect(tasks.map((t) => t.id), ['task-1', 'task-2', 'task-3']);
      expect(
        (await store.listByAccount('alice', limit: 2)).map((t) => t.id),
        ['task-1', 'task-2'],
      );
    });
  });

  group('countsByState（队列徽章）', () {
    test('全状态键 + 无任务计 0 + 分组计数正确', () async {
      await store.create(draft(clientTaskId: 'ct-1'));
      await store.create(draft(id: 'task-2', clientTaskId: 'ct-2'));
      await store.create(draft(id: 'task-3', clientTaskId: 'ct-3'));
      await advanceTo(store, 'task-2', UploadTaskState.completed);
      await advanceTo(store, 'task-3', UploadTaskState.waitingNetwork);

      final counts = await store.countsByState('alice');
      expect(counts.keys.toSet(), UploadTaskState.values.toSet(),
          reason: '徽章需要全部状态键（含 0）');
      expect(counts[UploadTaskState.preparing], 1);
      expect(counts[UploadTaskState.completed], 1);
      expect(counts[UploadTaskState.waitingNetwork], 1);
      expect(counts[UploadTaskState.uploading], 0);
      expect(counts[UploadTaskState.cancelled], 0);
    });
  });

  group('源文件保留策略（评审缺口 1 硬守护）', () {
    final now = DateTime.utc(2026, 9, 19, 12);
    final ancient = DateTime.utc(2026, 8, 30, 12); // now - 20 天（超过保留期）。

    test('cleanupCandidates：仅过期终态（completed+cancelled），新鲜与已清理的排除', () async {
      await store.create(
        draft(clientTaskId: 'ct-old-done'),
        now: ancient,
      );
      await advanceTo(
        store,
        'task-0001',
        UploadTaskState.completed,
        at: ancient.add(const Duration(minutes: 5)),
      );

      await store.create(
        draft(id: 'task-cancel', clientTaskId: 'ct-old-cancel'),
        now: ancient,
      );
      await advanceTo(
        store,
        'task-cancel',
        UploadTaskState.cancelled,
        at: ancient.add(const Duration(minutes: 5)),
      );

      // 保留期内完成的任务。
      await store.create(
        draft(id: 'task-fresh', clientTaskId: 'ct-fresh'),
        now: now.subtract(const Duration(days: 2)),
      );
      await advanceTo(
        store,
        'task-fresh',
        UploadTaskState.completed,
        at: now.subtract(const Duration(days: 2)).add(const Duration(minutes: 5)),
      );

      var candidates = await store.cleanupCandidates(14, now: now);
      expect(candidates.map((t) => t.id).toSet(), {'task-0001', 'task-cancel'});

      // 标记清理后不再出现（幂等）。
      await store.markCleanable('task-0001', now: now);
      candidates = await store.cleanupCandidates(14, now: now);
      expect(candidates.map((t) => t.id), ['task-cancel']);
    });

    test('硬守护：过期但未完成的任务永不出现在清理候选（全部非终态）', () async {
      // 各非终态摆一条"古老"任务（updatedAt 均早于保留期界）。
      await store.create(draft(clientTaskId: 'ct-p'), now: ancient);
      await store.create(draft(id: 'task-q', clientTaskId: 'ct-q'), now: ancient);
      await advanceTo(store, 'task-q', UploadTaskState.queued, at: ancient);
      await store.create(draft(id: 'task-u', clientTaskId: 'ct-u'), now: ancient);
      await advanceTo(store, 'task-u', UploadTaskState.uploading, at: ancient);
      await store.create(draft(id: 'task-w', clientTaskId: 'ct-w'), now: ancient);
      await advanceTo(
          store, 'task-w', UploadTaskState.waitingNetwork, at: ancient);
      await store.create(draft(id: 'task-r', clientTaskId: 'ct-r'), now: ancient);
      await advanceTo(
          store, 'task-r', UploadTaskState.retryableFailed, at: ancient);
      await store.create(draft(id: 'task-pf', clientTaskId: 'ct-pf'), now: ancient);
      await store.updateState(
        'task-pf',
        UploadTaskState.preparationFailed,
        now: ancient,
      );
      // uploading 停在核验中的古老任务。
      await store.create(draft(id: 'task-uc', clientTaskId: 'ct-uc'), now: ancient);
      await advanceTo(
        store,
        'task-uc',
        UploadTaskState.uploading,
        at: ancient,
      );
      await store.updateState(
        'task-uc',
        UploadTaskState.uploadedConfirming,
        now: ancient,
      );

      final candidates = await store.cleanupCandidates(14, now: now);
      expect(candidates, isEmpty,
          reason: '全部为未完成的古老任务，绝不进入清理候选');
    });

    test('markCleanable：非终态拒绝（守护另一面）且不落 cleanedAt', () async {
      await store.create(draft());
      await expectLater(
        store.markCleanable('task-0001'),
        throwsA(isA<StateError>()),
      );
      expect((await store.get('alice', 'task-0001'))!.cleanedAt, isNull);
    });

    test('markCleanable：终态可标记且幂等；delete 移除记录', () async {
      await store.create(draft());
      await advanceTo(store, 'task-0001', UploadTaskState.completed);
      final markAt = DateTime.utc(2026, 9, 20);
      await store.markCleanable('task-0001', now: markAt);
      expect((await store.get('alice', 'task-0001'))!.cleanedAt, markAt);
      // 幂等：重复标记只刷新时间。
      final markAgain = markAt.add(const Duration(days: 1));
      await store.markCleanable('task-0001', now: markAgain);
      expect((await store.get('alice', 'task-0001'))!.cleanedAt, markAgain);

      expect(await store.delete('task-0001'), 1);
      expect(await store.get('alice', 'task-0001'), isNull);
      expect(await store.delete('task-0001'), 0, reason: '重复删除返回 0');
    });
  });
}