"""Keep the old Chinese vLLM guide URL as a full, generated Markdown mirror."""

import argparse
from pathlib import Path
import sys


ROOT = Path(__file__).resolve().parents[1]
SOURCE = ROOT / "docs/vllm_guide_zh.md"
TARGET = ROOT / "docs/vllm_guide_zh_v2.md"
NOTICE = (
    "<!-- Generated by scripts/sync_vllm_guide.py; edit vllm_guide_zh.md. -->\n"
    "> This compatibility page is generated from the "
    "[maintained Chinese guide](./vllm_guide_zh.md). "
    "Edit that source and run `python scripts/sync_vllm_guide.py`.\n\n"
).encode("utf-8")


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--check", action="store_true", help="Fail on drift without writing")
    args = parser.parse_args()
    try:
        expected = NOTICE + SOURCE.read_bytes()
        if args.check:
            if not TARGET.is_file() or TARGET.read_bytes() != expected:
                print("Run python scripts/sync_vllm_guide.py to update the mirror.", file=sys.stderr)
                return 1
        else:
            TARGET.write_bytes(expected)
    except OSError as error:
        print(str(error), file=sys.stderr)
        return 1
    return 0


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