# Copyright 2022-2023 VMware, Inc.
# SPDX-License-Identifier: Apache-2
"""
The ``relenv fetch`` command.
"""

import os
import sys

from .build import platform_module, platform_versions
from .common import (
    CHECK_HOSTS,
    DATA_DIR,
    __version__,
    build_arch,
    check_url,
    download_url,
    get_triplet,
    work_dir,
)


def setup_parser(subparsers):
    """
    Setup the subparser for the ``fetch`` command.

    :param subparsers: The subparsers object returned from ``add_subparsers``
    :type subparsers: argparse._SubParsersAction
    """
    mod = platform_module()
    subparser = subparsers.add_parser("fetch", description="Fetch relenv builds")
    subparser.set_defaults(func=main)
    subparser.add_argument(
        "--arch",
        default=build_arch(),
        choices=mod.ARCHES,
        type=str,
        help="Architecture to download. [default: %(default)s]",
    )
    subparser.add_argument(
        "--python",
        default=platform_versions()[0],
        # Allow fetching of older versions
        # choices=platform_versions(),
        type=str,
        help="The python version [default: %(default)s]",
    )


def fetch(version, triplet, python, check_hosts=CHECK_HOSTS):
    """
    Fetch the specified python build.
    """
    for host in check_hosts:
        url = f"https://{host}/relenv/{version}/build/{python}-{triplet}.tar.xz"
        if check_url(url, timeout=5):
            break
    else:
        print(f"Unable to find file on any hosts {' '.join(check_hosts)}")
        sys.exit(1)
    builddir = work_dir("build", DATA_DIR)
    os.makedirs(builddir, exist_ok=True)
    download_url(url, builddir)


def main(args):
    """
    The entrypoint into the ``relenv fetch`` command.

    :param args: The args passed to the command
    :type args: argparse.Namespace
    """
    version = os.environ.get("RELENV_FETCH_VERSION", __version__)
    triplet = get_triplet(machine=args.arch)
    python = args.python
    check_hosts = CHECK_HOSTS
    if os.environ.get("RELENV_FETCH_HOST", ""):
        check_hosts = [os.environ["RELENV_FETCH_HOST"]]
    fetch(version, triplet, python, check_hosts)
