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"""Verify the exact Python/CUDA package surface used by the runtime."""

from __future__ import annotations

import hashlib
import importlib
import importlib.metadata
import json
import sys
from pathlib import Path
from typing import Any

EXPECTED_PYTHON = (3, 11)
EXPECTED_PACKAGES = {
    "av": "18.1.0",
    "decord": "0.6.0",
    "ms-swift": "4.5.2",
    "numpy": "2.3.5",
    "opencv-python-headless": "5.0.0.93",
    "Pillow": "10.4.0",
    "qwen-vl-utils": "0.0.14",
    "torch": "2.11.0+cu130",
    "transformers": "5.15.1",
    "vllm": "0.26.0",
}
IMPORT_NAMES = {
    "av": "av",
    "decord": "decord",
    "ms-swift": "swift",
    "numpy": "numpy",
    "opencv-python-headless": "cv2",
    "Pillow": "PIL",
    "qwen-vl-utils": "qwen_vl_utils",
    "torch": "torch",
    "transformers": "transformers",
    "vllm": "vllm",
}


def _sha256(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as handle:
        for block in iter(lambda: handle.read(8 * 1024 * 1024), b""):
            digest.update(block)
    return digest.hexdigest()


def verify_runtime() -> dict[str, Any]:
    """Import every direct runtime dependency and bind native OpenCV bytes."""

    if sys.version_info[:2] != EXPECTED_PYTHON:
        raise RuntimeError(
            f"Python version changed: {sys.version_info[:2]} != {EXPECTED_PYTHON}"
        )
    versions = {name: importlib.metadata.version(name) for name in EXPECTED_PACKAGES}
    if versions != EXPECTED_PACKAGES:
        raise RuntimeError(
            f"direct package versions changed: {versions} != {EXPECTED_PACKAGES}"
        )

    modules = {
        name: importlib.import_module(module_name)
        for name, module_name in IMPORT_NAMES.items()
    }
    torch = modules["torch"]
    if torch.version.cuda != "13.0":
        raise RuntimeError(f"Torch CUDA build changed: {torch.version.cuda!r}")

    cv2_root = (
        Path(modules["opencv-python-headless"].__file__).resolve(strict=True).parent
    )
    native_candidates = sorted(cv2_root.glob("cv2*.so"))
    if len(native_candidates) != 1 or not native_candidates[0].is_file():
        raise RuntimeError(
            f"expected one OpenCV native extension, found {native_candidates}"
        )
    native = native_candidates[0]
    return {
        "schema_version": "procedure.ep15_merged3225.runtime_verify.v1",
        "status": "PASS",
        "python": sys.version.split()[0],
        "packages": versions,
        "torch_cuda": torch.version.cuda,
        "opencv": {
            "module_root": str(cv2_root),
            "native_path": str(native),
            "native_bytes": native.stat().st_size,
            "native_sha256": _sha256(native),
        },
    }


def main() -> int:
    print(json.dumps(verify_runtime(), ensure_ascii=False, sort_keys=True))
    return 0


if __name__ == "__main__":
    raise SystemExit(main())