#!/bin/bash
root="$(pwd)"

# Ensure servers folders exist.
# If none, say so. If one, use it. If more, ask for selection if none provided.
input=$1
server_count="$(ls -lR|grep ^d|grep server|wc -l)"
if [ "$server_count" = "0" ];then
 echo "No servers found."
 exit 1
elif [ "$server_count" = "1" ];then
 for list in server_*;do
  server="$(echo $list|cut -f2 -d"_")"
 done
else
 valid=0
 until [ "$valid" = "1" ];do
  if [ "$input" = "" ];then
   echo "Available Servers:"
   for list in server_*;do
    echo "- $list"|cut -f2 -d"_"
   done
   until [ "$valid" = "1" ];do
    echo -n "Start: "
    read server
    if [ -d "server_$server" ];then
     valid=1
    else
     echo "No such server '$server'"
    fi
   done
  else
   if [ -d "server_$input" ];then
    server=$input
    valid=1
   else
    echo "No such server '$1'"
    unset input
   fi
  fi
 done
fi
unset input server_count list valid

# See what server executables we have (Spigot/Bukkit).
# If none, exit. If one, use it. If both, ask which to use.
cd executables
bukkit_amount="$(ls craftbukkit*.jar|wc -l)"
spigot_amount="$(ls spigot*.jar|wc -l)"

if [ "$bukkit_amount" != "0" ] && [ "$spigot_amount" != "0" ];then
 echo "Both Spigot and Bukkit executables found."
 valid=0
 until [ "$valid" = "1" ];do
  echo -n "[S/B] Use: "
  read -n1 jar
  if [ "${jar,,}" = "s" ]; then
   jar="spigot"
   valid=1
   echo
  elif [ "${jar,,}" = "b" ];then
   jar="craftbukkit"
   valid=1
   echo
  else
   echo -ne "          "\\r
   unset jar
  fi
 done
elif [ "$bukkit_amount" != "0" ];then
 jar="craftbukkit"
elif [ "$spigot_amount" != "0" ];then
 jar="spigot"
else
 echo "No Bukkit or Spigot executables found."
 echo -e "Ensure they're located at \e[33m$root/executables\e[0m, and are titled"
 echo -e "\e[33mcraftbukkit-version.jar\e[0m or \e[33mspigot-version.jar\e[0m respectively."
 exit 1
fi
unset bukkit_amount spigot_amount valid

# If multiple JAR files of the selected executable exists, move them all
# into the folder 'old-versions', then pull the last (latest, if named by version) back out.
echo "Moving any old versions into backup folder..."
if [ ! -d "old-versions" ];then mkdir old-versions;fi
for list in $jar*.jar;do
 mv $list old-versions/
done
jar="$list"
mv old-versions/$jar .
echo "Done."
unset list

# Ask if user wants the script to auto-restart the server upon exit.
valid=0
until [ "$valid" = "1" ];do
 echo -n "[Y/N] Auto-restart? "
 read -n1 input
 if [ "${input,,}" = "y" ];then
  keepalive=1
  valid=1
  echo
 elif [ "${input,,}" = "n" ];then
  keepalive=0
  valid=1
  echo
 else
  echo -n "          "\\r
 fi
done
unset valid input

# Execute server.
cd ../server_$server
echo "eula=true">eula.txt
loop=1
while [ "$loop" = "1" ];do
 # Disable the while loop we're in if user requested no auto-restart.
 if [ "$keepalive" = "0" ];then loop=0;fi
 unset keepalive

 # Give user time to ^C out of this script to prevent the next start.
 x=5
 while [ "$x" -gt "0" ];do
  echo -ne "Starting server in: $x     "\\r
  let x-=1
  sleep 1
 done
 unset x

 /usr/bin/java -jar ../executables/$jar;err=$?
 echo
 echo -n "Server exited, code "
 if [ "$err" = "0" ];then
  echo -e "\e[32m$err\e[0m."
 else
  echo -e "\e[31m$err\e[0m."
 fi

 echo
done