class TransactionModel {
  final String id;
  final double amount;
  final String type; // 'income' or 'expense'
  final int categoryId;
  final DateTime date;
  final String? note;
  final DateTime createdAt;
  final DateTime updatedAt;

  TransactionModel({
    required this.id,
    required this.amount,
    required this.type,
    required this.categoryId,
    required this.date,
    this.note,
    required this.createdAt,
    required this.updatedAt,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'amount': amount,
      'type': type,
      'categoryId': categoryId,
      'date': date.millisecondsSinceEpoch,
      'note': note,
      'createdAt': createdAt.millisecondsSinceEpoch,
      'updatedAt': updatedAt.millisecondsSinceEpoch,
    };
  }

  factory TransactionModel.fromMap(Map<String, dynamic> map) {
    return TransactionModel(
      id: map['id'],
      amount: map['amount'],
      type: map['type'],
      categoryId: map['categoryId'],
      date: DateTime.fromMillisecondsSinceEpoch(map['date']),
      note: map['note'],
      createdAt: DateTime.fromMillisecondsSinceEpoch(map['createdAt']),
      updatedAt: DateTime.fromMillisecondsSinceEpoch(map['updatedAt']),
    );
  }
}