import 'dart:io';
import 'dart:typed_data';

import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/features/community/media_direct_upload.dart';

/// 预签名直传客户端（T3-13）：本地 HttpServer 模拟 MinIO
/// （埋点队列测试先例）——200 成功、403 签名过期、传输中断三线路。
void main() {
  Future<HttpServer> startServer(
    Future<void> Function(HttpRequest request) handler,
  ) async {
    final server = await HttpServer.bind(InternetAddress.loopbackIPv4, 0);
    server.listen((request) async => handler(request));
    return server;
  }

  test('200：PUT 本体逐字节到达，requiredHeaders 原样携带，无鉴权头泄漏', () async {
    late Map<String, String?> seenHeaders;
    late List<int> seenBody;
    late String seenMethod;
    final server = await startServer((request) async {
      seenMethod = request.method;
      seenHeaders = {
        'content-type': request.headers.value('content-type'),
        'authorization': request.headers.value('authorization'),
        'x-device-id': request.headers.value('x-device-id'),
      };
      seenBody = await request.fold<List<int>>(
        [],
        (all, chunk) => all..addAll(chunk),
      );
      request.response.statusCode = 200;
      await request.response.close();
    });
    addTearDown(() => server.close(force: true));

    final bytes = Uint8List.fromList(List.generate(4096, (i) => i % 251));
    final progress = <(int, int)>[];
    await DioMediaDirectUploadClient().put(
      url:
          'http://127.0.0.1:${server.port}/patbond-media/post_image/a-1?X-Amz-Signature=sig',
      headers: const {'Content-Type': 'image/jpeg'},
      bytes: bytes,
      onProgress: (sent, total) => progress.add((sent, total)),
    );

    expect(seenMethod, 'PUT');
    expect(seenBody, bytes);
    // Content-Type 已签进签名，必须原样携带。
    expect(seenHeaders['content-type'], 'image/jpeg');
    // 裸客户端：预签名 URL 即鉴权，业务侧 Bearer/设备头不得外漏给存储。
    expect(seenHeaders['authorization'], isNull);
    expect(seenHeaders['x-device-id'], isNull);
    expect(progress.last.$1, progress.last.$2);
    expect(progress.last.$2, bytes.length);
  });

  test('403（签名过期/被改动）→ isCredentialRejected 异常', () async {
    final server = await startServer((request) async {
      await request.drain<void>();
      request.response.statusCode = 403;
      await request.response.close();
    });
    addTearDown(() => server.close(force: true));

    await expectLater(
      DioMediaDirectUploadClient().put(
        url: 'http://127.0.0.1:${server.port}/patbond-media/a-1',
        headers: const {'Content-Type': 'image/jpeg'},
        bytes: Uint8List(16),
      ),
      throwsA(
        isA<MediaDirectUploadException>()
            .having((e) => e.statusCode, 'statusCode', 403)
            .having(
              (e) => e.isCredentialRejected,
              'isCredentialRejected',
              true,
            ),
      ),
    );
  });

  test('传输中断（服务端半途断连）→ 网络型异常（statusCode null，可重试）', () async {
    final server = await startServer((request) async {
      // 读取少量字节后直接断开 socket，不回任何响应。
      await request.take(1).drain<void>();
      final socket = await request.response.detachSocket(writeHeaders: false);
      await socket.close();
      socket.destroy();
    });
    addTearDown(() => server.close(force: true));

    await expectLater(
      DioMediaDirectUploadClient().put(
        url: 'http://127.0.0.1:${server.port}/patbond-media/a-1',
        headers: const {'Content-Type': 'image/jpeg'},
        bytes: Uint8List.fromList(List.filled(1 << 20, 7)),
      ),
      throwsA(
        isA<MediaDirectUploadException>()
            .having((e) => e.statusCode, 'statusCode', isNull)
            .having(
              (e) => e.isCredentialRejected,
              'isCredentialRejected',
              false,
            ),
      ),
    );
  });
}