r"""Convert surface to BEM FIF file.

Examples
--------
.. code-block:: console

    $ mne surf2bem --surf ${SUBJECTS_DIR}/${SUBJECT}/surf/lh.seghead \
        --fif ${SUBJECTS_DIR}/${SUBJECT}/bem/${SUBJECT}-head.fif \
        --id=4

"""

# Authors: The MNE-Python contributors.
# License: BSD-3-Clause
# Copyright the MNE-Python contributors.

import sys

import mne


def run():
    """Run command."""
    from mne.commands.utils import get_optparser

    parser = get_optparser(__file__)

    parser.add_option(
        "-s", "--surf", dest="surf", help="Surface in Freesurfer format", metavar="FILE"
    )
    parser.add_option(
        "-f", "--fif", dest="fif", help="FIF file produced", metavar="FILE"
    )
    parser.add_option(
        "-i",
        "--id",
        dest="id",
        default=4,
        help=("Surface Id (e.g. 4 for head surface)"),
    )

    options, args = parser.parse_args()

    if options.surf is None:
        parser.print_help()
        sys.exit(1)

    print(f"Converting {options.surf} to BEM FIF file.")
    surf = mne.bem._surfaces_to_bem([options.surf], [int(options.id)], sigmas=[1])
    mne.write_bem_surfaces(options.fif, surf)


mne.utils.run_command_if_main()
