from __future__ import annotations

from dataclasses import dataclass
from typing import Generic, TypeVar, Type, Callable, Any

from .enums import DataTypeId

T = TypeVar("T")


@dataclass(frozen=True, slots=True)
class DataType(Generic[T]):
    """Logical datatype used on ports.

    :param id: stable enum id
    :param name: human readable name
    :param py_type: Python runtime type
    :param encode: optional encoder to JSON safe data
    :param decode: optional decoder from JSON safe data
    """
    id: DataTypeId
    name: str
    py_type: Type[T]
    encode: Callable[[T], Any] | None = None
    decode: Callable[[Any], T] | None = None
    color: str = "#888888"