#!/usr/bin/env python3
"""Example: discover and load a primitive assembly from the release manifest.

Run from the dataset repository root::

    python examples/load_artifact.py
    python examples/load_artifact.py --source toys4k --method superfrustum --object-id airplane_002
    python examples/load_artifact.py --artifact eval

Manifest discovery requires only the Python standard library plus
``load_release.py`` at the repo root. Actually unpickling primitive assemblies
may require SuperFit, PyTorch, NumPy, and related runtime dependencies. See:

    https://github.com/BardOfCodes/superfit
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path

# Allow `import load_release` when executed as `python examples/load_artifact.py`
_REPO_ROOT = Path(__file__).resolve().parent.parent
if str(_REPO_ROOT) not in sys.path:
    sys.path.insert(0, str(_REPO_ROOT))

from load_release import ReleaseIndex, load_metadata  # noqa: E402


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--root", type=Path, default=_REPO_ROOT, help="Dataset repo root.")
    parser.add_argument("--source", default="toys4k", choices=["toys4k", "partobjaverse"])
    parser.add_argument("--method", default="superfrustum")
    parser.add_argument("--object-id", default=None, help="Instance id; default: first match.")
    parser.add_argument(
        "--artifact",
        default="primitive_assembly",
        choices=[
            "primitive_assembly",
            "primitive_assembly_eval",
            "primitive_assembly_error",
            "primitive_assembly_textured",
        ],
    )
    args = parser.parse_args()

    meta = load_metadata(args.root)
    print(f"Release: {meta.get('release_root_name', args.root.name)}")
    print(f"Total instances in manifest: {meta.get('total_instances', '?')}")

    index = ReleaseIndex(args.root)
    if args.object_id:
        row = index.get(args.source, args.method, args.object_id)
    else:
        rows = index.filter(source_dataset=args.source, method=args.method)
        if not rows:
            raise SystemExit(f"No rows for {args.source}/{args.method}")
        row = rows[0]
        print(f"(using first of {len(rows)} matches)")

    print(f"Instance: {row['instance_dir']}")
    path = index.artifact_path(row, args.artifact)  # type: ignore[arg-type]
    print(f"Loading: {path} ({path.stat().st_size} bytes)")

    obj = index.load(row, args.artifact)  # type: ignore[arg-type]
    print(f"Loaded type: {type(obj).__name__}")
    if isinstance(obj, dict):
        print(f"Top-level keys ({len(obj)}): {list(obj.keys())[:20]}")
        if len(obj) > 20:
            print("  ...")


if __name__ == "__main__":
    main()