from typing import Optional

from tdw_catalog.utils import MetadataFieldType
import tdw_catalog.metadata.field as field


class Field(field.MetadataField[float]):
    """
    A field for confidence values or other fractional information

    Attributes
    ----------
    None
    """

    def __init__(self, key: str, value: Optional[float]) -> None:
        super().__init__(key, value)

    def serialize(self) -> dict:
        res = super().serialize()
        res["value"] = str(self.value)
        res["field_type"] = MetadataFieldType.FT_DECIMAL
        return res