#!/usr/bin/env python3

import hashlib
import os
import pprint
import re
import sys
import textwrap

from pathlib import Path


NON_ALPHA = re.compile('[^a-z._]')


def filename(s):
    s = s.lower()
    return NON_ALPHA.sub('_', s)


def get_line(lines):
    l = lines.pop(0)
    if l.startswith('* '):
        l = l[2:]
    elif l.startswith('*'):
        l = l[1:]
    return l

def main(argv):

    for fname in Path(argv[1]).rglob("*.comments"):
        basename = str(fname)[:-len('.comments')]
        odir = os.path.dirname(fname)

        tables = [[]]

        with open(fname) as f:
            lines = f.read().splitlines()

        while lines:
            l = get_line(lines)
            if l.lower().endswith('table'):
                tables[-1].append(l)

                while lines:
                    l = get_line(lines)
                    if not l:
                        break
                    tables[-1].append(l)
                tables.append([])
                continue

        if not tables[-1]:
            tables.pop(-1)

        tables_out = {}
        for i in range(0, len(tables)):
            table_name = tables[i].pop(0)
            table_data = textwrap.dedent('\n'.join(tables[i]))

            ofile = "{}.{}.table".format(basename, filename(table_name))

            data = '\n'.join([table_name, '', '', table_data])
            md5sum = hashlib.md5(data.encode('utf-8')).hexdigest()
            ofile_sum = os.path.join(odir, "{}.{}.table".format(filename(table_name), md5sum))

            if not os.path.exists(ofile_sum):
                with open(ofile_sum, 'w') as f:
                    f.write(data)
                print("Wrote", ofile_sum)
            print('Linked', ofile_sum, "to", ofile)

    return 0


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