import 'package:isar/isar.dart';

import '../Entities/transaction.dart';
import '../Services/isar_service.dart';

/// Funktionen zum interagieren mit der Datenbank für die Transaktionen
class TransactionRepository {
  final IsarService _isarService = IsarService();

  /// Fügt eine neue Transaktion zur Datenbank hinzu
  Future<Transaction?> add(final Transaction transaction) async {
    final Isar isar = await _isarService.getDatabase();

    final int id = await isar.writeTxn(
      () => isar.transactions.put(transaction),
    );

    return find(id);
  }

  /// Entfernt eine Transaktion aus der Datenbank
  Future<bool> remove(final Transaction transaction) async {
    final Isar isar = await _isarService.getDatabase();
    return isar.writeTxn(() => isar.transactions.delete(transaction.id));
  }

  /// Sucht eine Transaktion anhand seiner Id aus der Datenbank
  Future<Transaction?> find(final int id) async {
    final Isar isar = await _isarService.getDatabase();

    return isar.transactions.get(id);
  }

  /// Sucht Transaktionen anhand der gegebenen Parameter aus der Datenbank
  Future<List<Transaction>> findBy({
    final int? id,
    final String? name,
    final DateTime? date,
    final DateTime? dateBefore,
    final DateTime? dateAfter,
    final double? amount,
    final double? amountMin,
    final double? amountMax,
    final String? orderBy,
  }) async {
    final Isar isar = await _isarService.getDatabase();

    final QueryBuilder<Transaction, Transaction, QAfterFilterCondition>
    baseQuery = isar.transactions
        .filter()
        .optional(
          id != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.idEqualTo(id!),
        )
        .optional(
          name != null && name.isNotEmpty,
          (
            final QueryBuilder<Transaction, Transaction, QAfterFilterCondition>
            q,
          ) => q.nameMatches('*$name*', caseSensitive: false),
        )
        .optional(
          date != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.dateEqualTo(date),
        )
        .optional(
          dateBefore != null && dateAfter == null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.dateGreaterThan(dateBefore),
        )
        .optional(
          dateBefore == null && dateAfter != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.dateLessThan(dateAfter),
        )
        .optional(
          dateBefore != null && dateAfter != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.dateBetween(dateBefore, dateAfter),
        )
        .optional(
          amount != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.amountEqualTo(amount!),
        )
        .optional(
          amountMin != null && amountMax == null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.amountGreaterThan(amountMin!),
        )
        .optional(
          amountMin == null && amountMax != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.amountLessThan(amountMax!),
        )
        .optional(
          amountMin != null && amountMax != null,
          (final QueryBuilder<Transaction, Transaction, QFilterCondition> q) =>
              q.amountBetween(amountMin!, amountMax!),
        );

    switch (orderBy) {
      case 'nameAsc':
        return baseQuery.sortByName().findAll();

      case 'nameDesc':
        return baseQuery.sortByNameDesc().findAll();

      case 'dateAsc':
        return baseQuery.sortByDate().findAll();

      case 'dateDesc':
        return baseQuery.sortByDateDesc().findAll();

      case 'amountAsc':
        return baseQuery.sortByAmount().findAll();

      case 'amountDesc':
        return baseQuery.sortByAmountDesc().findAll();

      default:
        return baseQuery.findAll();
    }
  }
}