#!/usr/bin/env python3
from shutil import which
import re
import subprocess
import sys


def get_correct_clang_format():
    path = which("clang-format-18")
    if path:
        return path

    if which("clang-format") is None:
        raise Exception("no clang-format found")

    result = subprocess.run(
        ["clang-format", "--version"], capture_output=True, text=True, check=True
    )
    match = re.search(r"\b(\d+\.\d+\.\d+)\b", result.stdout)
    if not match:
        raise Exception(
            f"could not determine clang-format version from: {result.stdout.strip()}"
        )
    version = match.group(1)
    if version.split(".")[0] != "18":
        raise Exception(f"clang-format version 18 required. Found {version}")

    return "clang-format"


def main():
    clang_format = get_correct_clang_format()
    try:
        completed = subprocess.run([clang_format] + sys.argv[1:])
    except FileNotFoundError:
        print(f"error: clang-format not found at '{clang_format}'", file=sys.stderr)
        sys.exit(1)
    except PermissionError:
        print(f"error: permission denied when running '{clang_format}'", file=sys.stderr)
        sys.exit(1)
    except OSError as exc:
        print(f"error: failed to run '{clang_format}': {exc}", file=sys.stderr)
        sys.exit(1)
    sys.exit(completed.returncode)


if __name__ == "__main__":
    main()