"""CLI entry point — execs the bundled msb binary.

Resolution order:
  1. ``MSB_PATH`` environment variable
  2. Wheel-bundled ``microsandbox/_bundled/bin/msb[.exe]``
"""

from __future__ import annotations

import os
import sys
from pathlib import Path


def _msb_filename() -> str:
    """Return the platform-specific bundled CLI filename."""
    return "msb.exe" if os.name == "nt" else "msb"


def main() -> None:
    override = os.environ.get("MSB_PATH")
    msb = override or str(Path(__file__).parent / "_bundled" / "bin" / _msb_filename())

    if not os.path.isfile(msb):
        sys.stderr.write(
            f"microsandbox: msb binary not found at {msb}. "
            "Set MSB_PATH or reinstall the package.\n"
        )
        sys.exit(127)

    os.execv(msb, ["msb", *sys.argv[1:]])