#!/usr/bin/env python3

import os
import sys


def main(args):
    assert len(args) == 2, args

    infile = args.pop(0)
    assert os.path.isfile(infile), infile
    outdir = args.pop(0)
    assert os.path.isdir(outdir), outdir
    assert not args, args

    basename = os.path.basename(infile)
    fname, ext = basename.split('.', 1)

    part_a = []
    part_b = []

    direction = None
    for line in open(infile):
        if line.startswith('.subckt'):
            bits = line.split()
            assert len(bits) > 1, (bits, line)
            if bits[1].endswith('_b'):
                direction = 'b'
            else:
                direction = 'a'

        if direction is None:
            part_a.append(line)
            part_b.append(line)
        elif direction == 'a':
            part_a.append(line)
        elif direction == 'b':
            part_b.append(line)

    fname_a = os.path.join(outdir, f'{basename}')
    assert not os.path.exists(fname_a), fname_a
    fname_b = os.path.join(outdir, f'{fname}_b.new.{ext}')
    assert not os.path.exists(fname_b), fname_b

    print("split_nlowvt_rf.py: Wrote", fname_a, "with", len(part_a), "lines")
    with open(fname_a, 'w') as f:
        f.write(''.join(part_a))
    print("split_nlowvt_rf.py: Wrote", fname_b, "with", len(part_b), "lines")
    with open(fname_b, 'w') as f:
        f.write(''.join(part_b))


if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))