import 'dart:async';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../../../core/network/dio_client.dart';
import '../domain/commodity_rate.dart';

class CommodityRatesNotifier extends AsyncNotifier<List<CommodityRateHistory>> {
  @override
  FutureOr<List<CommodityRateHistory>> build() async {
    return _fetchLatestRates();
  }

  Future<List<CommodityRateHistory>> _fetchLatestRates() async {
    try {
      final response = await DioClient().dio.get('/inventory/commodity-rates/latest');
      if (response.statusCode == 200) {
        final List<dynamic> data = response.data;
        return data.map((e) => CommodityRateHistory.fromJson(e)).toList();
      }
    } catch (e) {
      // Fallback if empty or endpoint fails
    }
    return [];
  }

  Future<List<CommodityRateHistory>> fetchRateHistory(String commodityCode) async {
    try {
      final response = await DioClient().dio.get('/inventory/commodity-rates/$commodityCode');
      if (response.statusCode == 200) {
        final List<dynamic> data = response.data;
        return data.map((e) => CommodityRateHistory.fromJson(e)).toList();
      }
    } catch (e) {
      // Error fetching history
    }
    return [];
  }

  Future<CommodityRateHistory?> addRate(
    String commodityCode, 
    double rate, {
    String? commodityName,
    String? purity,
    String? source,
  }) async {
    try {
      final payload = {
        'commodityCode': commodityCode,
        'commodityName': commodityName ?? commodityCode,
        if (purity != null) 'purity': purity,
        'rate': rate,
        'source': source ?? 'MANUAL',
      };
      
      final response = await DioClient().dio.post(
        '/inventory/commodity-rates',
        data: payload,
      );
      
      if (response.statusCode == 200 && response.data != null) {
        final newRate = CommodityRateHistory.fromJson(response.data);
        state = await AsyncValue.guard(() => _fetchLatestRates());
        return newRate;
      }
    } catch (e) {
      rethrow;
    }
    return null;
  }

  Future<int> syncRateToProducts(String commodityCode) async {
    try {
      final response = await DioClient().dio.post(
        '/inventory/commodity-rates/$commodityCode/sync',
      );
      if (response.statusCode == 200 && response.data != null) {
        return (response.data['updatedCount'] as num?)?.toInt() ?? 0;
      }
    } catch (e) {
      rethrow;
    }
    return 0;
  }
}

final commodityRatesProvider =
    AsyncNotifierProvider<CommodityRatesNotifier, List<CommodityRateHistory>>(() {
  return CommodityRatesNotifier();
});