#!/bin/bash

######################################################################
#
#  Copyright (c) 2015 arakasi72 (https://github.com/arakasi72)
#
#  --> 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
}

#exit if run by root
if [ "$(id -u)" = "0" ]; then
  echo "Cannot be run as root, or with sudo"
  exit
fi

# 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"