#!/usr/bin/env python

#
# Copyright (C) 2007 Mark McLoughlin <mark@skynet.ie>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#

#
# Run with your 10k time, halfway time, 30k time and finish time e.g.:
#
# $> ./marathon.py 00:58:20 02:00:23 02:55:55 04:24:18
#

import sys
import string

START_TIME = "00:00:00"
MARATHON_IN_KM = 42.195

if len(sys.argv) != 5:
    sys.stderr.write("usage: %s <10k time> <halfway time> <30k time> <finish>\n" % sys.argv[0])
    sys.exit(1)

(tenk, halfway, thirtyk, finish) = sys.argv[1:]

def tm_to_secs(tm):
    (hours, minutes, seconds) = map(lambda s: float(s), string.split(tm, ":"))
    return (hours * 3600) + (minutes * 60) + seconds

def pace(start, end, len_in_km):
    p = (tm_to_secs(end) - tm_to_secs(start)) / len_in_km
    return "%.2d:%.2d" % (p / 60, p % 60)

print "Pace (time per km) at which each segment was run:"
print "  From start to 10k:   %s" % pace(START_TIME, tenk,    10)
print "  From 10k to halfway: %s" % pace(tenk,       halfway, (MARATHON_IN_KM / 2) - 10)
print "  From halfway to 30k: %s" % pace(halfway,    thirtyk, 30 - (MARATHON_IN_KM / 2))
print "  From 30k to finish:  %s" % pace(thirtyk,    finish,  MARATHON_IN_KM - 30)