import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:dio/dio.dart';

class ConversionUnit {
  final String name;
  final String symbol;
  final String category;
  final double rateToValue;

  ConversionUnit({required this.name, required this.symbol, required this.category, required this.rateToValue});
}

class ConverterNotifier extends StateNotifier<List<ConversionUnit>> {
  ConverterNotifier() : super(_initialUnits);

  static final List<ConversionUnit> _initialUnits = [
    ConversionUnit(name: 'Chilometri', symbol: 'km', category: 'Distanza', rateToValue: 1000),
    ConversionUnit(name: 'Metri', symbol: 'm', category: 'Distanza', rateToValue: 1),
    ConversionUnit(name: 'Kilogrammi', symbol: 'kg', category: 'Peso', rateToValue: 1),
    ConversionUnit(name: 'Libbre', symbol: 'lb', category: 'Peso', rateToValue: 0.453592),
  ];

  Future<void> fetchLiveRates() async {
    try {
      final response = await Dio().get('https://api.frankfurter.app/latest?from=EUR');
      final rates = response.data['rates'] as Map<String, dynamic>;
      state = [
        ...state,
        ConversionUnit(name: 'Dollaro USA', symbol: 'USD', category: 'Valuta', rateToValue: rates['USD']),
        ConversionUnit(name: 'Euro', symbol: 'EUR', category: 'Valuta', rateToValue: 1.0),
      ];
    } catch (e) {
      print("Errore API: $e");
    }
  }
}

final converterProvider = StateNotifierProvider<ConverterNotifier, List<ConversionUnit>>((ref) => ConverterNotifier());