#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re
import argparse


LINE = re.compile(r"^{(?P<start>\d+)}{(?P<stop>\d+)}(?P<text>.*)")
TPL = """%d
%s --> %s
%s
"""


def get_time(frame, fps):
    hour = 0
    minute = 0
    second = 0
    milisecond = 0

    val = frame/fps

    if val > 3600:
        hour = int(val/3600)
        val = val - (hour * 3600)

    if val > 60:
        minute = int(val/60)
        val = val - (minute * 60)

    if val > 0:
        second = int(val)
        milisecond = (val - second) * 1000

    return "%02d:%02d:%02d,%03.3d" % (hour, minute, second, milisecond)


def get_line(lno, line, fps):
    start, stop, text = LINE.match(line).groups()
    start = get_time(int(start), fps)
    stop = get_time(int(stop), fps)

    return TPL % (lno, start, stop, "\n".join(text.split('|')))


def main():
    parser = argparse.ArgumentParser(description='Convert MicroDVD subtitles '
                                     'to SRT')
    parser.add_argument('-f', '--fps', help='Frames per second. The '
                        'destination movie file FPS. Default 25 frames per '
                        'second.', default=25, type=float)
    parser.add_argument('filename', help='Subtitle in MicroDVD format.')
    args = parser.parse_args()

    with open(args.filename) as fob:
        for index, line in enumerate(fob.readlines(), 1):
            print(get_line(index, line, float(args.fps)))


if __name__ == "__main__":
    main()