from __future__ import annotations

from pathlib import Path


IMAGE_DIR = Path(__file__).resolve().parent / "image"


def _candidate_path(name: str | None) -> Path | None:
    if not name:
        return None
    candidate = IMAGE_DIR / f"{name}.png"
    if candidate.exists():
        return candidate
    return None


def get_scene_image_path(game_state, focus_npc: str | None = None) -> str | None:
    npc_candidate = _candidate_path(focus_npc)
    if npc_candidate is not None:
        return str(npc_candidate)

    for name in (
        getattr(game_state.world, "current_scene", None),
        getattr(game_state.player, "location", None),
    ):
        scene_candidate = _candidate_path(name)
        if scene_candidate is not None:
            return str(scene_candidate)

    return None