import 'dart:async';
import 'package:finlytic_app/core/network/api_client.dart';
import 'package:finlytic_app/features/trades/models/trade_model.dart';
import 'package:finlytic_app/features/trades/models/trade_acceptance_dto.dart';
import 'package:finlytic_app/features/trades/models/close_trade_request_dto.dart';
import 'package:finlytic_app/features/trades/models/derivative_item_model.dart';

class TradeRepository {
  final ApiClient apiClient;

  const TradeRepository({required this.apiClient});

  Future<List<TradeModel>> fetchTrades({String? isin, String? status}) async {
    try {
      final queryParams = <String, dynamic>{
        '_t': DateTime.now().millisecondsSinceEpoch,
      };
      if (isin != null && isin.isNotEmpty) queryParams['isin'] = isin;
      if (status != null && status.isNotEmpty) queryParams['status'] = status;

      final response = await apiClient.get('/api/v1/user/trades', queryParameters: queryParams);

      if (response.statusCode == 200 && response.data != null) {
        final List<dynamic> data = response.data;
        return data.map((json) => TradeModel.fromJson(json)).toList();
      }
      return [];
    } catch (e) {
      throw Exception('Trades konnten nicht geladen werden: $e');
    }
  }

  Future<List<DerivativeItemModel>> fetchDerivatives(
    String isin, {
    String optionType = 'long',
    double? targetLeverage,
    double? minLeverage,
    double? maxLeverage,
    String? search,
    String? after,
    int? page,
    bool forceRefresh = false,
  }) async {
    try {
      final queryParams = <String, dynamic>{
        'optionType': optionType,
        if (targetLeverage != null && targetLeverage > 0) 'targetLeverage': targetLeverage,
        if (minLeverage != null) 'minLeverage': minLeverage,
        if (maxLeverage != null) 'maxLeverage': maxLeverage,
        if (search != null && search.isNotEmpty) 'search': search,
        if (after != null && after.isNotEmpty) 'after': after,
        if (page != null) 'page': page,
        if (forceRefresh) 'forceRefresh': 'true',
        '_t': DateTime.now().millisecondsSinceEpoch,
      };

      final response = await apiClient.get('/api/v1/assets/$isin/derivatives', queryParameters: queryParams);

      if (response.statusCode == 200 && response.data != null) {
        final List<dynamic> data = response.data;
        return data.map((json) => DerivativeItemModel.fromJson(json)).toList();
      }
      return [];
    } catch (e) {
      throw Exception('Derivate konnten nicht geladen werden: $e');
    }
  }

  Future<void> acceptTrade(TradeAcceptanceDto dto) async {
    final response = await apiClient.post('/api/v1/user/trades/accept', data: dto.toJson());
    if (response.statusCode != 200) {
      throw Exception('Trade konnte nicht akzeptiert werden');
    }
  }

  Future<void> rejectTrade(String tradeId) async {
    final response = await apiClient.post('/api/v1/user/trades/$tradeId/reject');
    if (response.statusCode != 200) {
      throw Exception('Trade konnte nicht abgelehnt werden');
    }
  }

  Future<void> closeTrade(String id, {CloseTradeRequestDto? dto}) async {
    final response = await apiClient.post('/api/v1/user/trades/$id/close', data: dto?.toJson());
    if (response.statusCode != 200) {
      throw Exception('Trade konnte nicht geschlossen werden');
    }
  }
}