from typing import List, Optional

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


class Field(field.MetadataField[str]):
    """
    A preconfigured set of options where one of the options may be applied to a :class:`.Dataset`

    Attributes
    ----------
    list_items : Optional[List[str]]
        An optional list of values from which a user may choose a value
    """
    list_items: Optional[List[str]]

    def __init__(self, key: str, value: Optional[field.T],
                 list_items: Optional[List[str]]) -> None:
        super().__init__(
            key,
            value,
        )
        self.list_items = list_items

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