#!/usr/bin/env python3

# Libervia: an XMPP client
# Copyright (C) 2009-2026 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""Entry point for the Libervia CLI frontends."""

import os
import sys


def extract_isolation_arg(argv: list[str]) -> str | None:
    """Extract the isolation argument.

    Only arguments used before the first command are considered, avoiding conflicts with
    sub-commands.

    @param argv: The command line arguments, without the program name
    @return: The isolation name, or None if the argument is not used
    """
    for i, arg in enumerate(argv):
        if arg in ("-i", "--isolation"):
            if i + 1 >= len(argv):
                return None
            return argv[i + 1]
        if arg.startswith("-i") and len(arg) > 2:
            # combined short option, e.g. "-iname"
            return arg[2:]
        if arg.startswith("--isolation="):
            return arg.split("=", 1)[1]
        if not arg.startswith("-"):
            # first positional argument (the command), we stop here
            break
    return None


def main() -> None:
    """Run the Libervia CLI."""
    # The backend reads the environment variable at import time, we have to process the
    # isolation argument here, before first "libervia.backend" import.
    isolation = extract_isolation_arg(sys.argv[1:])
    if isolation is not None:
        os.environ["LIBERVIA_ISOLATION"] = isolation
    from libervia.cli.base import LiberviaCli

    LiberviaCli.run()