# -*- Mode: Python -*-

# fix subtitles that are too far off by adjusting all the timestamps
# this is for files with a '.SRT' extension, whatever those are.

import sys
import re
from pdb import set_trace as trace

stamp = re.compile ('([0-9][0-9]):([0-9][0-9]):([0-9][0-9]),([0-9]+) --> ([0-9][0-9]):([0-9][0-9]):([0-9][0-9]),([0-9]+)')

def pack (h,m,s):
    return int(h) * 60 * 60 + int(m) * 60 + int(s)

def unpack (t):
    m, s = divmod (t, 60)
    h, m = divmod (m, 60)
    return h, m, s

def adjust_line (line, offset):
    m = stamp.match (line)
    if not m:
        return line
    else:
        h0,m0,s0,x,h1,m1,s1,y = m.groups()
        t0 = pack (h0, m0, s0)
        t1 = pack (h1, m1, s1)
        t0 += offset
        t1 += offset
        h0, m0, s0 = unpack (t0)
        h1, m1, s1 = unpack (t1)
        return '%02d:%02d:%02d,%s --> %02d:%02d:%02d,%s%s' % (
            h0, m0, s0, x,
            h1, m1, s1, y,
            line[m.end():]
            )

input = open (sys.argv[1], 'rb')
output = open (sys.argv[1] + '.adjusted', 'wb')
offset = int (sys.argv[2])

while 1:
    line = input.readline()
    if not line:
        break
    else:
        output.write (adjust_line (line, offset))