#!/usr/bin/env python
from __future__ import print_function
import sys
import os
import re
import datetime
import gzip
import fileinput
import string
import random


def check_filename(fname):
    if not os.path.exists(fname):
        return fname
    new_fname = fname + "." + "".join(random.sample(string.lowercase, 6))
    print("Warning: %s exists, nor overwriting, writing to %s instead" % (fname, new_fname))
    return new_fname


def main(file_names):
    fi = fileinput.FileInput(file_names, openhook=fileinput.hook_compressed)
    f = None
    last_date = None
    for line in fi:
        match = re.match(r".+?\[(.+?):.+?\]", line)
        try:
            date = match.group(1)
            if date != last_date:
                last_date = date
                dt = datetime.datetime.strptime(date, "%d/%b/%Y")
                fname = check_filename(dt.strftime("access.log-%Y%m%d.gz"))
                print(fname)
                if f is not None:
                    f.close()
                #f = open(fname, "w")
                f = gzip.GzipFile(fname, "w")
            f.write(line)
        except:
            print("Error context: %s:%d\n%s" % (fi.filename(), fi.filelineno(), line))
            raise
    f.close()


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