#!/usr/bin/env python3
"""rebuild_manifest.py — make public/props/manifest.json match what is on disk.

    python3 tools/gen/rebuild_manifest.py

The manifest is the list the game loads at boot; a prop missing from it renders
as a placeholder even though its PNG is sitting right there. Two ways that
happens: a concurrent batch losing an entry to a read-modify-write race (now
locked in props_import.py, but earlier runs were not), or a sprite copied into
the directory by hand.

Directory listing is the source of truth here, deliberately — the PNGs are what
the game can actually load.
"""
from __future__ import annotations

import json
from pathlib import Path

PROPS = Path(__file__).resolve().parent.parent.parent / "public" / "props"


def main() -> None:
    names = sorted(p.stem for p in PROPS.glob("*.png"))
    man_path = PROPS / "manifest.json"
    before = set(json.loads(man_path.read_text()).get("props", [])) if man_path.exists() else set()
    man_path.write_text(json.dumps({"props": names}, indent=2) + "\n")

    added = [n for n in names if n not in before]
    dropped = sorted(before - set(names))
    print(f"manifest now lists {len(names)} props")
    if added:
        print(f"  recovered (on disk, were missing from the manifest): {', '.join(added)}")
    if dropped:
        print(f"  removed (listed but no PNG on disk): {', '.join(dropped)}")


if __name__ == "__main__":
    main()