#!/bin/bash

# ARK: survival evolved manager
#
# Original author:      LeXaT
# Maintainer:           FezVrasta, Sispheor

# Check the user is not currently running this script as root
if [ "$(id -u)" == "0" ]; then
   echo "This script must NOT be run as root" 1>&2
   exit 1
fi

#---------------------
# Variables
#---------------------

# Global variables
source /etc/arkmanager/arkmanager.cfg

# Local variables
info=""
thejob=""
instver=""
bnumber=""
timestamp=$( date +%T )
GREEN="\\033[1;32m"
RED="\\033[1;31m"
NORMAL="\\033[0;39m"

#---------------------
# functions
#---------------------
function testfunction(){
  if [ -z $servermail ]; then
    echo "mail ok"
  fi

}

#
# Check if a new version is available but not apply it
#
function checkForUpdate(){
  if isUpdateNeeded; then
    echo "Current version:" $instver
    echo "Available version:" $bnumber
    echo "Your server needs to be restarted in order to receive the latest update."
    echo "Run \"arkmanager update\" to do so"
  else
    echo "No update available"
  fi
}

#
# Set the new current version in a file
#
function setCurrentVersion(){
  cd "$arkserverroot"
  echo $bnumber > arkversion
}

#
# Check if the server need to be updated
# Return 0 if update is needed, else return 1
#
function isUpdateNeeded(){
  getCurrentVersion
  getAvailableVersion
  if [ "$bnumber" -eq "$instver" ]; then
    return 1   # no update needed
  else
    return 0   # update needed
  fi

}

#
# Return the current version number
#
function getCurrentVersion(){
  cd "$arkserverroot"
  touch arkversion # If the file doesn't exist
  instver=`cat "arkversion"`
  return $instver

}

#
# Get the current available server version on steamdb
#
function getAvailableVersion(){
  bnumber=`$steamcmdroot/$steamcmdexec +login anonymous +app_info_print "$appid" +quit | grep -EA 5 "^\s+\"public\"$" | grep -E "^\s+\"buildid\"\s+" | tr '[:blank:]"' ' ' | tr -s ' ' | cut -f3 | sed 's/^ //' | cut -c9-14`
  return $bnumber
}

#
# Check id the server process is alive
#
function isTheServerRunning(){
  SERVICE="ShooterGameServer"
  ps aux | grep -v grep | grep $SERVICE > /dev/null
  result=$?
  return $result
}

#
# Check if the server is up and visible in steam server list
# If the server is listenning on his port return 0, else return 1
#
function isTheServerUp(){
  lsof -i |grep $arkserverport > /dev/null
  result=$?
  return $result
}


#
# start function
#
doStart() {
  if isTheServerRunning; then
    echo "The server is already running"
  else
    arkserveropts="TheIsland?SessionName=$sessioname?QueryPort=$arkqueryport?ServerPassword=$arkserverpass?ServerAdminPassword=$arkserverapass?listen"
    thejob="$arkserverroot/$arkserverexec $arkserveropts"
    # run the server in background
    $thejob >/dev/null 2>&1 &
    echo "$timestamp: start" >> "$logdir/arkserver.log"
  fi
}

#
# stop the ARK server
#
doStop() {
  if isTheServerRunning; then
    echo "Stopping server..."
    # kill the server with the PID
    PID=`ps -ef | grep "$arkserverroot/$arkserverexec" | grep -v grep | awk '{print $2}'`
    kill -9 $PID
    echo "$timestamp: stop" >> "$logdir/arkserver.log"
  else
    echo "The server is already stopped"
  fi
}

#
# install of ARK server
#
doInstall() {
  mkdir -p $arkserverroot

  cd "$steamcmdroot"
  # install the server
  ./$steamcmdexec +login anonymous +force_install_dir "$arkserverroot" +app_update $appid validate +quit
  # the current version should be the last version. We set our version
  getAvailableVersion
  setCurrentVersion
}

#
# Stop the server, update it and then start it back.
#
doUpdate() {
  cd "$arkserverroot"

  if isUpdateNeeded; then
    # check if the server was alive before the update so we can launch it back after the update
    serverWasAlive=0
    if isTheServerRunning ;then
      serverWasAlive=1
    fi
    doStop
    cd "$steamcmdroot"
    ./$steamcmdexec +login anonymous +force_install_dir "$arkserverroot" +app_update $appid +quit
    cd "$logdir"
    echo "$bnumber" > "$arkserverroot/arkversion"
    cd "$steamcmdroot"
    echo "$timestamp: update to $bnumber complete" >> "$logdir/update.log"
    
    # we restart the server only if it was started before the update
    if [ $serverWasAlive -eq 1 ]; then
      doStart
    fi
  else
      echo "No update available"
      echo "$timestamp: No update needed." >> "$logdir/update.log"
        tail -n 1 "$logdir/update.log"
  fi;
}

#
# Print the status of the server (running? online? version?)
#
printStatus(){
  if isTheServerRunning ;then
    echo -e "$NORMAL" "Server running:" "$GREEN" "Yes"
  else
    echo -e "$NORMAL" "Server running:" "$RED" "No"
  fi

  if isTheServerUp ;then
    echo -e "$NORMAL" "Server online:" "$GREEN" " Yes"
  else
    echo -e "$NORMAL" "Server online:" "$RED" " No"
  fi
  getCurrentVersion
  echo -e "$NORMAL" "Server version:" "$GREEN" $instver
  echo -e "$NORMAL"

}

#---------------------
# Main program
#---------------------
case "$1" in
    start)
        doStart
    ;;
    stop)
        doStop
    ;;
    restart)
        doStop
        echo "$timestamp: stop" >> "$logdir/arkserver.log"
        sleep 10
        doStart
        echo "$timestamp: start" >> "$logdir/arkserver.log"
        echo "$timestamp: restart" >> "$logdir/arkserver.log"
    ;;
    install)
        doInstall
    ;;
    update)
        doUpdate
        #testfunction
    ;;
    checkupdate)
      checkForUpdate
    ;;
    broadcast)
        doInfo $2
    ;;
    status)
      printStatus
    ;;
    *)
        echo "use arkmanager <start|stop|restart|install|update|broadcast|status>"
    ;;
esac