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

# for http://www.reddit.com/r/dailyprogrammer/comments/pjsdx/difficult_challenge_2/

import time, math, sys

class Timer:
    running = False
    start = 0
    hour = 60*60
    minute = 60
    log = None
    def start_stop(self):
        if self.running:
            i = self.format_time(self.get_time_diff())
            self.running = False
            self.log.write('Finished: %s\n' % i)
            self.log.close()
            print('Clock stopped. Time is: %s' % i)
            return
        self.start = time.time()
        self.running = True
        self.log = open('timer.log', mode='w')
        print('Clock started.')

    def lap(self):
        if not self.running:
            print('You need to start the clock before you can get lap times.')
            return
        i = self.format_time(self.get_time_diff())
        self.log.write('Lap: %s\n' % i)
        print('Lap time is: %s' % i)

    def quit(self):
        if self.running:
            self.start_stop()
        sys.exit()

    def get_time_diff(self):
        return time.time() - self.start

    def format_time(self, seconds):
        h = '00'
        m = '00'
        s = '00'
        ms = '000'
        if (seconds >= self.hour):
            hours = int(math.floor(seconds/self.hour))
            h = '%02d' % hours
            seconds = seconds % self.hour
        if (seconds >= self.minute):
            minutes = int(math.floor(seconds/self.minute))
            m = '%02d' % minutes
            seconds = seconds % self.minute
        if (seconds > 0):
            secs = int(math.floor(seconds))
            s = '%02d' % secs
            seconds = seconds % 1
        if (seconds > 0):
            ms = '%s' % seconds
            ms = ms[2:5]
        return '%s:%s:%s.%s' % (h, m, s, ms)

print('Welcome to timer!\nAvailable commands are (s)tart/(s)top, (l)ap time and (q)uit.')
t = Timer();
while True:
    try:
        command = input('Command: ').strip()
    except EOFError:
        print('')
        continue
    if not len(command):
        continue
    command = command[0]
    if 'l' ==  command:
        t.lap()
    elif 's' == command:
        t.start_stop()
    elif 'q' == command:
        t.quit()
    else:
        print('invalid command "%s", plese try again.' % command)