import 'package:dio/dio.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/core/network/api_client.dart';
import 'package:patbond_flutter/core/network/api_exception.dart';
import 'package:patbond_flutter/core/network/token_refresher.dart';
import 'package:patbond_flutter/features/auth/session_manager.dart';
import 'package:patbond_flutter/features/community/community_exceptions.dart';
import 'package:patbond_flutter/features/community/community_models.dart';
import 'package:patbond_flutter/features/community/community_repository.dart';

import '../../helpers/auth_test_helpers.dart';
import '../../helpers/community_test_helpers.dart';

void main() {
  late SessionManager session;
  late FakeHttpAdapter adapter;
  late FakeHttpAdapter mediaAdapter;
  late ApiCommunityRepository repository;

  Future<void> setUpWith(
    Future<ResponseBody> Function(RequestOptions) handler,
  ) async {
    session = SessionManager(store: InMemoryTokenStore());
    await session.updateTokens(sampleTokens(access: 'community-access'));
    final dio = buildPatbondDio(
      session: session,
      baseUrl: 'http://community.local',
    );
    adapter = FakeHttpAdapter(handler);
    dio.httpClientAdapter = adapter;
    final refresher = TokenRefresher(dio: dio, session: session);
    // media 两步上传端点由 user 服务提供（13 号报告 §2），走独立客户端;
    // 两 adapter 分开记录以断言线路不串。
    final mediaDio = buildPatbondDio(
      session: session,
      baseUrl: 'http://user.local',
    );
    mediaAdapter = FakeHttpAdapter(handler);
    mediaDio.httpClientAdapter = mediaAdapter;
    repository = ApiCommunityRepository(
      api: ApiClient(dio: dio, session: session, refresher: refresher),
      mediaApi: ApiClient(
        dio: mediaDio,
        session: session,
        refresher: refresher,
      ),
    );
  }

  group('请求线路（路径 / 方法 / 鉴权 / 参数）', () {
    test(
      'createMediaUpload：POST /api/v1/media/uploads 走 user 服务客户端，携带 Bearer',
      () async {
        await setUpWith(
          (options) async =>
              jsonResponse(201, okEnvelope(sampleUploadCredentialsJson())),
        );

        final credentials = await repository.createMediaUpload(
          const CreateMediaUploadRequest(
            kind: MediaKind.image,
            purpose: MediaPurpose.postImage,
            mimeType: 'image/jpeg',
            byteSize: 204800,
          ),
        );

        // 线路：media 端点不打 community 客户端。
        expect(adapter.requests, isEmpty);
        final request = mediaAdapter.requests.single;
        expect(request.baseUrl, 'http://user.local');
        expect(request.path, '/api/v1/media/uploads');
        expect(request.method, 'POST');
        expect(request.headers['Authorization'], 'Bearer community-access');
        expect(request.data, {
          'kind': 'image',
          'purpose': 'post_image',
          'mimeType': 'image/jpeg',
          'byteSize': 204800,
        });
        expect(credentials.uploadUrl, contains('X-Amz-Signature'));
      },
    );

    test('completeMediaUpload：POST /complete 无请求体（服务端幂等）', () async {
      await setUpWith(
        (options) async =>
            jsonResponse(200, okEnvelope(sampleMediaAssetJson())),
      );

      final asset = await repository.completeMediaUpload('a-1');

      expect(adapter.requests, isEmpty);
      final request = mediaAdapter.requests.single;
      expect(request.path, '/api/v1/media/uploads/a-1/complete');
      expect(request.method, 'POST');
      expect(asset.status, MediaAssetStatus.ready);
    });

    test('帖子 CRUD：POST / GET / PATCH / DELETE 线路', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return switch (call) {
          1 => jsonResponse(201, okEnvelope(samplePostJson())),
          2 => jsonResponse(200, okEnvelope(samplePostJson())),
          3 => jsonResponse(200, okEnvelope(samplePostJson(version: 2))),
          _ => jsonResponse(200, {'code': 0, 'message': 'ok', 'data': null}),
        };
      });

      await repository.createPost(const CreatePostRequest(content: '正文'));
      await repository.getPost('p-1');
      final updated = await repository.updatePost(
        'p-1',
        const UpdatePostRequest(version: 1, publish: true),
      );
      await repository.deletePost('p-1');

      expect(adapter.requests[0].path, '/api/v1/posts');
      expect(adapter.requests[0].method, 'POST');
      expect(adapter.requests[1].path, '/api/v1/posts/p-1');
      expect(adapter.requests[1].method, 'GET');
      expect(adapter.requests[2].method, 'PATCH');
      expect(adapter.requests[2].data, {'version': 1, 'status': 'published'});
      expect(adapter.requests[3].method, 'DELETE');
      expect(updated.version, 2);
    });

    test('listMyPosts：/api/v1/me/posts 分页 + status 过滤，缺省不传', () async {
      await setUpWith(
        (options) async => jsonResponse(
          200,
          okEnvelope(
            cursorPageJson([samplePostJson()], nextCursor: 'c2', hasMore: true),
          ),
        ),
      );

      final page = await repository.listMyPosts(
        limit: 20,
        cursor: 'c1',
        status: PostStatus.draft,
      );
      await repository.listMyPosts();

      expect(adapter.requests[0].path, '/api/v1/me/posts');
      expect(adapter.requests[0].queryParameters, {
        'limit': 20,
        'cursor': 'c1',
        'status': 'draft',
      });
      expect(adapter.requests[1].queryParameters, isEmpty);
      expect(page.items.single.id, 'p-1');
      expect(page.nextCursor, 'c2');
      expect(page.hasMore, isTrue);
    });

    test('getFeed：/api/v1/feed 游标分页与 FeedCard 信封解析', () async {
      await setUpWith(
        (options) async => jsonResponse(
          200,
          okEnvelope(
            cursorPageJson(
              [sampleFeedCardJson()],
              nextCursor: 'f2',
              hasMore: true,
            ),
          ),
        ),
      );

      final page = await repository.getFeed(limit: 20, cursor: 'f1');

      final request = adapter.requests.single;
      expect(request.path, '/api/v1/feed');
      expect(request.queryParameters, {'limit': 20, 'cursor': 'f1'});
      expect(page.items.single.contentPreview, '晒了一下午太阳。');
      expect(page.nextCursor, 'f2');
    });

    test('评论：列表分页、创建、顶层短路径删除', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return switch (call) {
          1 => jsonResponse(
            200,
            okEnvelope(cursorPageJson([sampleCommentJson()])),
          ),
          2 => jsonResponse(201, okEnvelope(sampleCommentJson())),
          _ => jsonResponse(200, {'code': 0, 'message': 'ok', 'data': null}),
        };
      });

      final page = await repository.listComments('p-1', limit: 20);
      await repository.createComment(
        'p-1',
        const CreateCommentRequest(content: '好可爱！'),
      );
      await repository.deleteComment('c-1');

      expect(adapter.requests[0].path, '/api/v1/posts/p-1/comments');
      expect(adapter.requests[0].queryParameters, {'limit': 20});
      expect(adapter.requests[1].method, 'POST');
      expect(adapter.requests[1].data, {'content': '好可爱！'});
      expect(adapter.requests[2].path, '/api/v1/comments/c-1');
      expect(adapter.requests[2].method, 'DELETE');
      expect(page.items.single.content, '好可爱！');
      expect(page.hasMore, isFalse);
    });

    test('点赞/收藏：PUT 与 DELETE 同路径，返回权威终态', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return switch (call) {
          1 => jsonResponse(200, okEnvelope({'liked': true, 'likeCount': 7})),
          2 => jsonResponse(200, okEnvelope({'liked': false, 'likeCount': 6})),
          3 => jsonResponse(
            200,
            okEnvelope({'bookmarked': true, 'bookmarkCount': 3}),
          ),
          _ => jsonResponse(
            200,
            okEnvelope({'bookmarked': false, 'bookmarkCount': 2}),
          ),
        };
      });

      final liked = await repository.likePost('p-1');
      final unliked = await repository.unlikePost('p-1');
      final bookmarked = await repository.bookmarkPost('p-1');
      await repository.unbookmarkPost('p-1');

      expect(adapter.requests[0].path, '/api/v1/posts/p-1/like');
      expect(adapter.requests[0].method, 'PUT');
      expect(adapter.requests[1].path, '/api/v1/posts/p-1/like');
      expect(adapter.requests[1].method, 'DELETE');
      expect(adapter.requests[2].path, '/api/v1/posts/p-1/bookmark');
      expect(adapter.requests[2].method, 'PUT');
      expect(adapter.requests[3].method, 'DELETE');
      // PUT/DELETE 语义幂等：无 Idempotency-Key。
      for (final request in adapter.requests) {
        expect(request.headers.containsKey('Idempotency-Key'), isFalse);
      }
      expect(liked.liked, isTrue);
      expect(liked.likeCount, 7);
      expect(unliked.liked, isFalse);
      expect(bookmarked.bookmarkCount, 3);
    });

    test('listMyBookmarks：/api/v1/me/bookmarks，项形态 = FeedCard', () async {
      await setUpWith(
        (options) async => jsonResponse(
          200,
          okEnvelope(cursorPageJson([sampleFeedCardJson()])),
        ),
      );

      final page = await repository.listMyBookmarks(cursor: 'b1');

      expect(adapter.requests.single.path, '/api/v1/me/bookmarks');
      expect(adapter.requests.single.queryParameters, {'cursor': 'b1'});
      expect(page.items.single.id, 'p-1');
    });

    test('关注：PUT / DELETE / follow-stats 线路与终态', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return switch (call) {
          1 => jsonResponse(
            200,
            okEnvelope({'following': true, 'followerCount': 12}),
          ),
          2 => jsonResponse(
            200,
            okEnvelope({'following': false, 'followerCount': 11}),
          ),
          _ => jsonResponse(
            200,
            okEnvelope({
              'followerCount': 11,
              'followingCount': 34,
              'followedByMe': false,
            }),
          ),
        };
      });

      final followed = await repository.followUser('u-2');
      final unfollowed = await repository.unfollowUser('u-2');
      final stats = await repository.getFollowStats('u-2');

      expect(adapter.requests[0].path, '/api/v1/users/u-2/follow');
      expect(adapter.requests[0].method, 'PUT');
      expect(adapter.requests[1].method, 'DELETE');
      expect(adapter.requests[2].path, '/api/v1/users/u-2/follow-stats');
      expect(adapter.requests[2].method, 'GET');
      expect(followed.following, isTrue);
      expect(unfollowed.followerCount, 11);
      expect(stats.followingCount, 34);
    });
  });

  group('Idempotency-Key（community 域必带语义）', () {
    test('createPost / createComment 必带键，每次逻辑提交换新键', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return call <= 2
            ? jsonResponse(201, okEnvelope(samplePostJson()))
            : jsonResponse(201, okEnvelope(sampleCommentJson()));
      });

      await repository.createPost(const CreatePostRequest(content: '一'));
      await repository.createPost(const CreatePostRequest(content: '二'));
      await repository.createComment(
        'p-1',
        const CreateCommentRequest(content: '三'),
      );

      final keys = adapter.requests
          .map((r) => r.headers['Idempotency-Key'] as String?)
          .toList();
      expect(keys, everyElement(isNotNull));
      expect(keys, everyElement(isNotEmpty));
      // 每次逻辑提交换新键（契约：1~128 字符，建议 UUID）。
      expect(keys.toSet().length, 3);
      expect(keys.every((key) => key!.length <= 128), isTrue);
    });

    test('GET / PATCH / DELETE 不带 Idempotency-Key', () async {
      var call = 0;
      await setUpWith((options) async {
        call += 1;
        return switch (call) {
          1 => jsonResponse(200, okEnvelope(samplePostJson())),
          2 => jsonResponse(200, okEnvelope(samplePostJson(version: 2))),
          _ => jsonResponse(200, {'code': 0, 'message': 'ok', 'data': null}),
        };
      });

      await repository.getPost('p-1');
      await repository.updatePost('p-1', const UpdatePostRequest(version: 1));
      await repository.deletePost('p-1');

      for (final request in adapter.requests) {
        expect(request.headers.containsKey('Idempotency-Key'), isFalse);
      }
    });

    test('40101：单飞刷新后重放，重放沿用同一 Idempotency-Key', () async {
      await setUpWith((options) async {
        if (options.path == '/api/v1/auth/refresh') {
          return jsonResponse(
            200,
            okEnvelope(tokenDataJson(access: 'new-access')),
          );
        }
        if (options.headers['Authorization'] == 'Bearer community-access') {
          return jsonResponse(401, errorEnvelope(40101, 'token 过期'));
        }
        return jsonResponse(201, okEnvelope(samplePostJson()));
      });

      await repository.createPost(const CreatePostRequest(content: '正文'));

      final postRequests = adapter.requests
          .where((r) => r.path == '/api/v1/posts')
          .toList();
      expect(postRequests, hasLength(2));
      expect(postRequests.last.headers['Authorization'], 'Bearer new-access');
      // 刷新重放是同一逻辑提交：同键命中服务端首次结果，不重复建帖。
      expect(
        postRequests.first.headers['Idempotency-Key'],
        postRequests.last.headers['Idempotency-Key'],
      );
    });
  });

  group('错误码 → 类型化异常映射（v1.3.0 新增 9 码 + 40902）', () {
    Future<void> expectMapped(int httpStatus, int code, Matcher matcher) async {
      await setUpWith(
        (options) async => jsonResponse(httpStatus, errorEnvelope(code)),
      );
      await expectLater(repository.getPost('p-x'), throwsA(matcher));
    }

    test('40301 → PostAccessDeniedException', () async {
      await expectMapped(403, 40301, isA<PostAccessDeniedException>());
    });

    test('40403 → PostNotFoundException（防枚举合并）', () async {
      await expectMapped(404, 40403, isA<PostNotFoundException>());
    });

    test('40404 → CommentNotFoundException', () async {
      await expectMapped(404, 40404, isA<CommentNotFoundException>());
    });

    test('40405 → MediaAssetNotFoundException', () async {
      await expectMapped(404, 40405, isA<MediaAssetNotFoundException>());
    });

    test('40406 → CommunityUserNotFoundException', () async {
      await expectMapped(404, 40406, isA<CommunityUserNotFoundException>());
    });

    test('40902 → PostVersionConflictException（共码独立类型）', () async {
      await expectMapped(409, 40902, isA<PostVersionConflictException>());
    });

    test('40905 → IdempotencyMismatchException', () async {
      await expectMapped(409, 40905, isA<IdempotencyMismatchException>());
    });

    test('42203 → MediaNotReadyException', () async {
      await expectMapped(422, 42203, isA<MediaNotReadyException>());
    });

    test('42204 → SelfFollowException', () async {
      await expectMapped(422, 42204, isA<SelfFollowException>());
    });

    test('42205 → MediaUploadStateException', () async {
      await expectMapped(422, 42205, isA<MediaUploadStateException>());
    });

    test('40401（pets 域码）不升格，保持通用 ApiBusinessException', () async {
      await setUpWith(
        (options) async => jsonResponse(404, errorEnvelope(40401, '宠物不存在')),
      );
      await expectLater(
        repository.createPost(const CreatePostRequest(content: '带宠物')),
        throwsA(
          isA<ApiBusinessException>()
              .having((e) => e.code, 'code', 40401)
              .having((e) => e, 'type', isNot(isA<PostNotFoundException>())),
        ),
      );
    });

    test('类型化异常仍可按基类 ApiBusinessException 捕获', () {
      const error = SelfFollowException(message: '不能关注自己');
      expect(error, isA<ApiBusinessException>());
      expect(error.code, ApiCodes.selfFollow);
    });
  });

  test('community 服务基地址常量存在且默认指向 :8084', () {
    expect(patbondCommunityApiBaseUrl, 'http://127.0.0.1:8084');
  });
}