#!/bin/bash

######################################################################
#
#  Copyright (c) 2015 arakasi72 (https://github.com/arakasi72)
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 
#
#  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
#  --> Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
#
######################################################################

# rTorrent Stop/Start/Restart
PATH=/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/bin:/sbin
FILE="$HOME/rtorrent/.session/rtorrent.lock"
SERVICE='rtorrent'
SERVICEB='irssi'
RTPID=$(pgrep -fx -u $LOGNAME $SERVICE)
# Sets default status can be askkill, autokill, or donotkill
KILLSTATUS='askkill'
KILLSIGNAL='-2'
RTLOG="/dev/null"
loglines=500
useerr=0
LOGFLAG=0
helpflag=1

# write log file
log_header() {
RTLOG="$HOME/rt.log"
echo >> $RTLOG
date >> $RTLOG
echo "$0 $@" >> $RTLOG
if [ $(cat "$RTLOG" | wc -l) -gt $loglines ]; then
  tail -$loglines  "$RTLOG" > $HOME/rt.temp
  cat $HOME/rt.temp > $RTLOG
  rm -f $HOME/rt.temp
fi
}

# function to check if service is running
service_running(){
pgrep -fx -u $LOGNAME $SERVICE > /dev/null
}

# function to ask user for y/n response
ask_user(){
if [ -t 1 ]; then
  while true
    do
      read -p "Unable to close $SERVICE, close using kill -9? " answer
      case $answer in [Yy]* ) return 0 ;;
                      [Nn]* ) return 1 ;;
                          * ) echo "Enter y or n";;
      esac
    done
else
  echo "Running in background -a auto response is y" >> $RTLOG
  return 0
fi
}

# function that starts service
start_service(){
local seconds=0
if [ $SERVICE = "rtorrent" ]; then
  if [ -a $FILE ]; then
    echo "removing $FILE" | tee -a "$RTLOG"
    rm -f $FILE
  else
    echo "No session lock file" | tee -a "$RTLOG"
  fi
fi

echo -n "Starting $SERVICE"
screen -d -m -S $SERVICE $SERVICE

while ! (service_running)
  do
    seconds=$(( $seconds + 1 ))
    echo -n "."
    sleep 1
    if [ $seconds = 10 ]; then
      echo
      return 1
    fi
  done

echo
return 0
}

# function that stops service
stop_service(){
local seconds=0
echo -n "$SERVICE shutting down using kill $1"
kill $1 $RTPID

while ( service_running )
  do
     seconds=$(( $seconds + 1 ))
     echo -n " ."
     sleep 1
     if [ $seconds = 20 ]; then
       echo
       return 1
     fi
  done

echo
return 0
}

# reports any usage error
usage_error() {
echo "usage: [-h] [-a|-k|-d] [-l] [start | stop | restart]" | tee -a "$RTLOG"
if [ $1 = 1 ]; then
  echo "only one of the options -a -k -d allowed" | tee -a "$RTLOG"
elif [ $1 = 2 ]; then
  echo "incorrect option used" | tee -a "$RTLOG"
elif [ $1 = 3 ]; then
  echo "incorrect argument used" | tee -a "$RTLOG"
elif [ $1 = 4 ]; then
  echo "too many arguments, only 1 argument allowed" | tee -a "$RTLOG"
fi

exit 1
}

# prints usage help to screen
usage_help() {
echo "usage: [-h] [-i] [-a|-k|-d] [-l] [start | stop | restart]"
echo "options:"
echo "  -h usage help display"
echo "  -i sets service to $SERVICEB"
echo "  -l send results to log file (~/rt.log)"
echo "  -a if unable to close $SERVICE ask user whether to use kill -9"
echo "  -k if unable to close $SERVICE use kill -9"
echo "  -d if unable to close $SERVICE do not use kill -9"
echo "arguments:"
echo "  start starts $SERVICE"
echo "  stop stops $SERVICE"
echo "  restart first stops and then starts $SERVICE"

exit 0
}


# Check for options
while getopts ":hlikad" optname
  do
    case $optname in
      "k" )[[ -n $OPTFLAG ]]  && useerr=1 || KILLSTATUS='autokill' && OPTFLAG=1 ;;
      "a" )[[ -n $OPTFLAG ]]  && useerr=1 || KILLSTATUS='askkill' && OPTFLAG=1 ;;
      "d" )[[ -n $OPTFLAG ]]  && useerr=1 || KILLSTATUS='donotkill' && OPTFLAG=1 ;;
      "i" ) SERVICE=$SERVICEB && RTPID=$(pgrep -fx -u $LOGNAME $SERVICE) ;;
      "l" ) LOGFLAG=1 ;;
      "h" ) helpflag=0 ;;
        * ) useerr=2 ;;
    esac
  done

if [ $helpflag = 0 ]; then
  usage_help
fi

if [ $LOGFLAG = 1 ]; then
  log_header "$@"
fi

if [ $useerr -gt 0 ]; then
  usage_error $useerr
fi

shift $(( $OPTIND - 1 ))

# Check correct arguments used
if [ $# = 1 ]; then
  if ! [[ $1 = "stop" || $1 = "start" || $1 = "restart"  ]]; then
    useerr=3
    usage_error $useerr
  fi
fi

# Check if there is more than 1 argument
if [ $# -gt 1 ]; then
  useerr=4
  usage_error $useerr
fi

# Check if service is running
if [ $# = 0 ]; then
  if ( service_running ); then
    echo "$SERVICE is running"
  else
    echo "$SERVICE is NOT running"
  fi
fi

# Stop Service
if [[ $1 = "stop" || $1 = "restart" ]]; then
  if ! ( service_running ); then
    echo "$SERVICE was not running"
  else
    if ! ( stop_service $KILLSIGNAL ); then
      case $KILLSTATUS in
        "autokill" )
          KILLSIGNAL='-9'
          stop_service $KILLSIGNAL ;;
        "askkill" )
          if ( ask_user ); then
            KILLSIGNAL='-9'
            stop_service $KILLSIGNAL
          fi ;;
      esac
    fi

    if ( service_running ); then
      echo "WARNING unable to close $SERVICE using $KILLSIGNAL" | tee -a "$RTLOG"
      exit 1
    else
      echo "$SERVICE has been closed using kill $KILLSIGNAL" | tee -a "$RTLOG"
    fi
  fi
fi

# Start Service
if [[ $1 = "start" || $1 = "restart" ]]; then
  if ( service_running ); then
    echo "$SERVICE was already running"
  else
    if ( start_service ); then
      echo "$SERVICE has been started" | tee -a "$RTLOG"
    else
      echo "WARNING: Unable to start $SERVICE" | tee -a "$RTLOG"
    fi
  fi
fi

echo "There were no problems encountered" >> "$RTLOG"