from datetime import date
from typing import Optional

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


class Field(field.MetadataField[date]):
    """
    Add dates to the :class:`.Dataset` to keep track of timelines or events

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

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

    def serialize(self) -> dict:
        res = super().serialize()
        res["value"] = self.value.strftime("%Y-%m-%d") if self.value is not None else None
        res["field_type"] = MetadataFieldType.FT_DATE
        return res