import '../../core/constants/api_endpoints.dart';
import '../../core/network/api_response.dart';
import '../../core/network/dio_client.dart';
import '../models/kline_candle.dart';

/// K线 REST API 服务
class KlineService {
  final DioClient _client;

  KlineService(this._client);

  /// 获取历史K线数据
  Future<ApiResponse<List<KlineCandle>>> fetchHistory({
    required String coinCode,
    required String interval,
    int limit = 200,
    int? before,
  }) async {
    final params = <String, dynamic>{
      'coinCode': coinCode,
      'interval': interval,
      'limit': limit,
    };
    if (before != null) params['before'] = before;

    final response = await _client.get<Map<String, dynamic>>(
      ApiEndpoints.klineHistory,
      queryParameters: params,
    );

    if (response.success && response.data != null) {
      final list = response.data!['list'] as List? ?? [];
      final candles = list
          .map((e) => KlineCandle.fromHistoryJson(e as Map<String, dynamic>))
          .toList();
      return ApiResponse.success(candles, response.message);
    }
    return ApiResponse.fail(response.message ?? '获取K线数据失败');
  }

  /// 获取当前进行中的K线
  Future<ApiResponse<KlineCandle>> fetchCurrentCandle({
    required String coinCode,
    required String interval,
  }) async {
    final response = await _client.get<Map<String, dynamic>>(
      ApiEndpoints.klineCurrent,
      queryParameters: {'coinCode': coinCode, 'interval': interval},
    );

    if (response.success && response.data != null) {
      return ApiResponse.success(
        KlineCandle.fromJson(response.data!),
        response.message,
      );
    }
    return ApiResponse.fail(response.message ?? '获取当前K线失败');
  }

  /// 获取支持的周期列表
  Future<ApiResponse<List<String>>> fetchIntervals() async {
    final response = await _client.get<Map<String, dynamic>>(
      ApiEndpoints.klineIntervals,
    );

    if (response.success && response.data != null) {
      final list = response.data!['list'] as List? ?? [];
      return ApiResponse.success(list.cast<String>(), response.message);
    }
    return ApiResponse.fail(response.message ?? '获取周期列表失败');
  }
}