"""CLI: ``python -m simplex_chat install [--backend=sqlite|postgres]``."""

from __future__ import annotations

import argparse
import sys

from . import _native


def main(argv: list[str] | None = None) -> int:
    p = argparse.ArgumentParser(prog="simplex_chat")
    sub = p.add_subparsers(dest="command", required=True)
    install = sub.add_parser("install", help="Pre-fetch libsimplex into the user cache")
    install.add_argument(
        "--backend",
        choices=["sqlite", "postgres"],
        default="sqlite",
        help="which libsimplex variant to download (default: sqlite)",
    )
    args = p.parse_args(argv)
    # `args.command` is always set: `add_subparsers(required=True)` makes
    # argparse exit before reaching this point if no subcommand is given.
    assert args.command == "install"
    try:
        path = _native._resolve_libs_dir(args.backend)
        print(f"libsimplex installed at: {path}")
        return 0
    except Exception as e:
        print(f"install failed: {e}", file=sys.stderr)
        return 1


if __name__ == "__main__":
    sys.exit(main())