#!/usr/bin/env python3
"""Build the dependency-free GovOPlaN deployer as one executable zipapp."""

from __future__ import annotations

import argparse
from hashlib import sha256
from pathlib import Path
import zipapp


ROOT = Path(__file__).resolve().parent
DEFAULT_OUTPUT = ROOT.parent.parent / "runtime" / "deployment" / "govoplan-deploy.pyz"


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT)
    args = parser.parse_args(argv)

    output = args.output.expanduser().resolve()
    if output == ROOT or ROOT in output.parents:
        raise SystemExit("output must be outside the deployment source directory")
    output.parent.mkdir(mode=0o700, parents=True, exist_ok=True)
    temporary = output.with_name(f".{output.name}.tmp")
    if temporary.exists():
        temporary.unlink()
    zipapp.create_archive(
        ROOT,
        target=temporary,
        interpreter="/usr/bin/env python3",
        compressed=True,
        filter=_include_source,
    )
    temporary.chmod(0o755)
    temporary.replace(output)
    digest = sha256(output.read_bytes()).hexdigest()
    print(f"{digest}  {output}")
    return 0


def _include_source(path: Path) -> bool:
    return (
        "__pycache__" not in path.parts
        and path.suffix not in {".pyc", ".pyo"}
        and path.name != "build-deployer-zipapp.py"
    )


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