from sys import argv
from tqdm import tqdm
from itertools import product

sep_map = {'tab': '\t',
           'comma': ',',
           ',': ',',
           'semicolon': ';',
           ';': ';',
           'space': ' ',
           'pipe': '|',
           '|': '|'}


def main(fpath, inner_sep, outer_sep='tab'):
    """
    :param str fpath:
    :param str inner_sep:
    :param str outer_sep:
    """
    out_fpath = fpath[:-4] + '_unstacked'+fpath[-4:]
    if outer_sep not in sep_map:
        return
    if inner_sep not in sep_map:
        return

    outer_sep = sep_map[outer_sep]
    inner_sep = sep_map[inner_sep]

    def disaggregateded_lines(line):
        tokens = line.strip().split(outer_sep)
        subtokens = [token.split(inner_sep) for token in tokens]
        lines = '\n'.join([outer_sep.join(tpl) for tpl in product(*subtokens)])
        return lines + '\n'

    with open(out_fpath, 'w') as outfile:
        for line in tqdm(open(fpath, 'r')):
            outfile.write(disaggregateded_lines(line))


if __name__ == "__main__":
    args = argv[1:]
    if 0 < len(args) < 3:
        main(*args)
    else:
        print('Usage: python simple_unstacker.tsv')