#!/usr/bin/env python3

# Argument is minutes

import os
import sys
import time
import subprocess
import re

for time_arg in sys.argv:                                 # defined in commandline arguments
    print(time_arg, 'minutes')
    
time_mins = int(time_arg)                                 # convert str to int   
time_secs = time_mins * 60                                # convert to seconds for time.sleep 

mpc_vol_take = subprocess.check_output(['mpc', 'volume']) # take volume
mpc_vol_str = str(mpc_vol_take)                           # make string
mpc_vol_int = re.sub( r'b\'volume: ', '', mpc_vol_str )   # regex 1/2
mpc_vol_int = int(re.sub( r'%\\n\'', '', mpc_vol_int))    # regex 2/2 and take int

time_step = int(time_secs / 12)                           # time in seconds of volume reducing
vol_step = int(mpc_vol_int / 12)                          # volume in procents

mpc_vol_cmd = "mpc volume -{0}".format(vol_step)          # reduse volume
mpc_stop = "mpc stop"                                     # stop MPD
mpc_vol_replace = "mpc volume {0}".format(mpc_vol_int)    # replace start volume
 
while True:
    if time_secs > 0:
        time.sleep(time_step)
        os.system(mpc_vol_cmd)
        time_secs = int(time_secs - time_step)
    if time_secs == 0:
        os.system(mpc_stop)
        os.system(mpc_vol_replace)
        
        break