# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

import os
import argparse

from jupyter_client.kernelspec import KernelSpecManager


def install_my_kernel_spec(user=True, prefix=None):
    """Install the kernel spec for user in given prefix."""
    print('Installing mlir-opt IPython kernel spec')
    pkgroot = os.path.dirname(__file__)
    KernelSpecManager().install_kernel_spec(os.path.join(pkgroot, 'assets'),
                                            'mlir',
                                            user=user,
                                            prefix=prefix)


def _is_root():
    """Returns whether the current user is root."""
    try:
        return os.geteuid() == 0
    except AttributeError:
        # Return false wherever unknown.
        return False


def main(argv=None):
    parser = argparse.ArgumentParser(
        description='Install KernelSpec for MlirOpt Kernel')
    prefix_locations = parser.add_mutually_exclusive_group()

    prefix_locations.add_argument('--user',
                                  help='Install in user home directory',
                                  action='store_true')
    prefix_locations.add_argument('--prefix',
                                  help='Install directory prefix',
                                  default=None)

    args = parser.parse_args(argv)

    user = args.user or not _is_root()
    prefix = args.prefix

    install_my_kernel_spec(user=user, prefix=prefix)


if __name__ == '__main__':
    main()