abstract class TableColumnDefinition {
  final String columnName;
  final bool isUnique;

  TableColumnDefinition({
    required this.columnName,
    required this.isUnique,
  });

  String get def => throw UnimplementedError("def getter not implemented");
}

class SerialPrimaryColumnDefinition extends TableColumnDefinition {
  SerialPrimaryColumnDefinition({
    required super.columnName,
  }) : super(isUnique: true);

  @override
  String get def => "$columnName:serial:primary";
}

class TextColumnDefinition extends TableColumnDefinition {
  TextColumnDefinition({
    required super.columnName,
    required super.isUnique,
  });

  @override
  String get def => "$columnName:str${isUnique ? ":unique" : ""}";
}

class BooleanColumnDefinition extends TableColumnDefinition {
  BooleanColumnDefinition({
    required super.columnName,
    required super.isUnique,
  });

  @override
  String get def => "$columnName:bool${isUnique ? ":unique" : ""}";
}

class TimestampColumnDefinition extends TableColumnDefinition {
  TimestampColumnDefinition({
    required super.columnName,
    required super.isUnique,
  });

  @override
  String get def => "$columnName:datetime${isUnique ? ":unique" : ""}";
}

class DoubleColumnDefinition extends TableColumnDefinition {
  DoubleColumnDefinition({
    required super.columnName,
    required super.isUnique,
  });

  @override
  String get def => "$columnName:float${isUnique ? ":unique" : ""}";
}

class IntegerColumnDefinition extends TableColumnDefinition {
  IntegerColumnDefinition({
    required super.columnName,
    required super.isUnique,
  });

  @override
  String get def => "$columnName:int${isUnique ? ":unique" : ""}";
}

class UserRefColumnDefinition extends TableColumnDefinition {
  UserRefColumnDefinition({
    required super.columnName,
  }) : super(isUnique: false);

  @override
  String get def => "$columnName:int-user";
}

class AssetRefColumnDefinition extends TableColumnDefinition {
  AssetRefColumnDefinition({
    required super.columnName,
  }) : super(isUnique: false);

  @override
  String get def => "$columnName:int-asset";
}