#! /usr/bin/env python3

from argparse import ArgumentParser

from fileinput import FileInput, hook_encoded

import re, itertools, sys

try:

    from math import log2

except:

    from math import log

    def log2(x): return log(x) / log(2)

word = re.compile(r"(\S*?)(/|\s.*|$)")

unwanted = re.compile(r"(^\d|[^']*')")

space = re.compile(r'^\s')

p = ArgumentParser(description="create dictionary csv out of hunspell data")

p.add_argument('--hunspell', '-H', type=str, default="/usr/share/hunspell",

    help='directory where hunspell dictionary files reside (default: /usr/share/hunspell)')

p.add_argument('--lang', '-l', type=str, default="en_US",

    help='use dictionary for language LANG (default: en_US)')

p.add_argument('--encoding', '-e', type=str, default="utf-8",

    help='file encoding (default: utf-8)')

args = p.parse_args()

try:

    from icu import UnicodeString, Locale

except ImportError:

    print("warning: PyICU not installed, using fallback", file=sys.stderr)

    def upper(x):

        return x.upper();

else:

    locale = Locale(args.lang)

    def upper(x):

        u = UnicodeString(x)

        return str(u.toUpper(locale))

_all = (

    upper(word.match(line).group(1))

        for line in FileInput(

                args.hunspell + "/" + args.lang + ".dic",

                openhook=hook_encoded(args.encoding)

            )

        if not space.match(line)

)

_words = [w for w in _all if len(w) > 2 and not unwanted.match(w)]

_words.sort()

_words = [w for w, g in itertools.groupby(_words)]

while len(_words) > 65536 * 2:

    _words = _words[::2]

if len(_words) > 65536:

    _words = _words[:65536]

elif len(_words) < 65536:

    sys.stderr.write(

            "warning for {}: only {:.2f} bit in wordlist, that makes {:.2f} bit for 5 words\n".format(

                    args.lang,

                    log2(len(_words)),

                    log2(len(_words))*5

                )

        )

    _words.extend(_words[:65536-len(_words)])

assert len(_words) == 65536, "lenght is {}".format(len(_words))

for i, w in enumerate(_words):

    print("{l},{i},{w},0".format(l=args.lang[:2], i=i, w=w))