import 'dart:convert';
import 'dart:io' show Platform;
import 'dart:typed_data';

import 'package:cupertino_http/cupertino_http.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
import 'package:http/http.dart' as http;

import '../auth/session_store.dart';
import '../config/app_config.dart';

/// 假目标上报 API 客户端（契约见 server/README.md「假目标上报」）。
/// 仅上传误报框裁剪图（客户端已重编码剥离元数据）+ 检测框快照字段。
class FeedbackApi {
  final String baseUrl;
  final SessionStore sessionStore;
  final http.Client _client;

  FeedbackApi({String? baseUrl, required this.sessionStore, http.Client? client})
      : baseUrl = baseUrl ?? AppConfig.apiBaseUrl,
        _client = client ?? _defaultHttpClient();

  static http.Client _defaultHttpClient() {
    if (!kIsWeb && Platform.isIOS) {
      return CupertinoClient.defaultSessionConfiguration();
    }
    return http.Client();
  }

  /// 上报假目标：[jpeg] 为上报瞬间的分析帧整图（与推理帧同源同尺寸），
  /// [detectionsJson] 为当前全部检测框快照 JSON 数组（可为空串）
  Future<int> reportFalseTarget({
    required Uint8List jpeg,
    required String detectionsJson,
    required int sourceW,
    required int sourceH,
  }) async {
    final token = await sessionStore.readToken();
    if (token == null || token.isEmpty) {
      throw Exception('登录已失效');
    }
    final req = http.MultipartRequest(
      'POST',
      Uri.parse('$baseUrl/api/v1/feedback/false-target'),
    )
      ..headers['Authorization'] = 'Bearer $token'
      ..fields['detections'] = detectionsJson
      ..fields['sourceW'] = '$sourceW'
      ..fields['sourceH'] = '$sourceH'
      ..files.add(
          http.MultipartFile.fromBytes('file', jpeg, filename: 'frame.jpg'));
    final streamed =
        await _client.send(req).timeout(const Duration(seconds: 30));
    final res = await http.Response.fromStream(streamed);
    final Map<String, dynamic> json;
    try {
      json = jsonDecode(res.body) as Map<String, dynamic>;
    } catch (_) {
      throw Exception('服务端响应异常 (${res.statusCode})');
    }
    if (res.statusCode != 200 || json['code'] != 0) {
      throw Exception(json['message'] as String? ?? '上报失败 (${res.statusCode})');
    }
    return ((json['data'] as Map?)?['id'] as num?)?.toInt() ?? 0;
  }
}