"""Portal — a transition point between zones."""

from __future__ import annotations

from dataclasses import dataclass

from mudlib.thing import Thing


@dataclass
class Portal(Thing):
    """A portal connecting zones.

    Portals are non-portable Things that exist in zones and define
    transitions to other zones via target coordinates.
    """

    target_zone: str = ""
    target_x: int = 0
    target_y: int = 0

    def __post_init__(self) -> None:
        """Force portals to be non-portable."""
        self.portable = False
        super().__post_init__()