"""
Bundle the skeleton-gif package into a self-contained artifact ready for
`huggingface_hub.upload_folder` or `SkeletonGif.from_pretrained` against a
relocated directory.

What this does:
1. Vendors ../generate.py → ./engine.py so the model dir is fully portable.
2. Writes config.json snapshotting the current engine's label sets.
3. Leaves existing README.md and requirements.txt untouched (edit by hand
   when needed).

Run:
    python -m skeleton_gif_model.bundle
or:
    cd skeleton_gif_model && python bundle.py
"""

from __future__ import annotations

import shutil
import sys
from pathlib import Path


def bundle(root: Path | None = None) -> Path:
    here = Path(__file__).resolve().parent
    root = root or here.parent

    src = root / "generate.py"
    dst = here / "engine.py"
    if not src.exists():
        raise FileNotFoundError(f"Expected the engine at {src}")
    shutil.copyfile(src, dst)
    print(f"[bundle] vendored {src} -> {dst}")

    # Snapshot config by importing the freshly-vendored engine.
    if str(here.parent) not in sys.path:
        sys.path.insert(0, str(here.parent))
    # Reload, in case engine was already imported from a different location.
    import importlib
    if "skeleton_gif_model.engine" in sys.modules:
        importlib.reload(sys.modules["skeleton_gif_model.engine"])
    from skeleton_gif_model.modeling import SkeletonGif

    model = SkeletonGif()
    model.save_pretrained(here)
    print(f"[bundle] wrote {here / 'config.json'}")
    return here


if __name__ == "__main__":
    out = bundle()
    print(f"[bundle] done. Model dir: {out}")