import '../database/daos/statistiche_dao.dart';
import '../database/daos/articoli_dao.dart';
import '../database/daos/clienti_dao.dart';
import '../database/daos/agenti_dao.dart';
import '../database/database.dart';

class StatisticsService {
  final StatisticheDao _statisticheDao;
  final ArticoliDao _articoliDao;
  final ClientiDao _clientiDao;
  final AgentiDao _agentiDao;

  StatisticsService(this._statisticheDao, this._articoliDao, this._clientiDao, this._agentiDao);

  Future<List<StatisticheVenditaData>> getStatsForAgent(int idAgente, {String? da, String? a}) async {
    final from = da ?? DateTime.now().subtract(const Duration(days: 365)).toIso8601String();
    final to = a ?? DateTime.now().toIso8601String();
    return _statisticheDao.getPerAgente(idAgente, from, to);
  }

  Future<double> getTotalForAgent(int idAgente, {String? da, String? a}) async {
    final stats = await getStatsForAgent(idAgente, da: da, a: a);
    return stats.fold<double>(0.0, (sum, s) => sum + (s.importo ?? 0.0));
  }

  Future<Map<String, double>> getTotalsByClient(int idAgente, {String? da, String? a}) async {
    final stats = await getStatsForAgent(idAgente, da: da, a: a);
    final result = <String, double>{};
    for (final s in stats) {
      final key = s.idCliente.toString();
      result[key] = (result[key] ?? 0) + (s.importo ?? 0);
    }
    return result;
  }

  Future<Map<String, double>> getTotalsByArticle(int idAgente, {String? da, String? a}) async {
    final stats = await getStatsForAgent(idAgente, da: da, a: a);
    final result = <String, double>{};
    for (final s in stats) {
      final key = s.idArticolo.toString();
      result[key] = (result[key] ?? 0) + (s.importo ?? 0);
    }
    return result;
  }

  Future<Map<String, double>> getMonthlyTotals(int idAgente, {int months = 12}) async {
    final to = DateTime.now();
    final from = DateTime(to.year, to.month - months, to.day);
    final stats = await _statisticheDao.getPerAgente(
      idAgente,
      from.toIso8601String(),
      to.toIso8601String(),
    );
    final result = <String, double>{};
    for (final s in stats) {
      if (s.dataFattura == null || s.dataFattura!.length < 7) continue;
      final monthKey = s.dataFattura!.substring(0, 7);
      result[monthKey] = (result[monthKey] ?? 0) + (s.importo ?? 0);
    }
    return result;
  }
}