#!/bin/bash
### BEGIN INIT INFO
# Provides: craftbukkit
# Required-Start: mountkernfs $local_fs $network
# Required-Stop: mountkernfs $local_fs $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Craftbukkit Minecraft Server
# Description: Craftbukkit Minecraft Server
### END INIT INFO

# Config START
USER="craftbukkit"
SRVPATH="/opt/craftbukkit"
WORLDPATH="/opt/craftbukkit/world"
JAVAOPTS="-d64 -server -Xms1G -Xmx4G -XX:+UseG1GC -XX:+AggressiveOpts -XX:+UseFastAccessorMethods -XX:TargetSurvivorRatio=90 -XX:MaxGCPauseMillis=200 -XX:MaxPermSize=256m -Dlog4j.configurationFile=bukkit-log.xml"
JARNAME="craftbukkit.jar"
JAROPTS="--universe ${WORLDPATH}"
# Config END

# We want LSB functions here
. /lib/lsb/init-functions

server_running() {
  if [ -z "$(pgrep -f -n $JARNAME)" ]; then
    return 1
  else
    return 0
  fi
}

server_start() {
  if ! server_running; then
    log_daemon_msg "Starting Minecraft Server" "Craftbukkit"
    sudo -u ${USER} tmux new-session -d -s craftbukkit-console "cd ${SRVPATH}; java ${JAVAOPTS} -jar ${JARNAME} ${JAROPTS}" >/dev/null 2>&1
    if [ $? -gt 0 ]; then  # Tmux did not start
      log_failure_msg
      exit 1
    elif sleep 1 && ! server_running; then  # Tmux started, but Java did not
      logger -t craftbukkit -p local0.crit "Craftbukkit start failed"
      log_failure_msg
      exit 1
    else
      logger -t craftbukkit -p local0.info "Craftbukkit minecraft server started"
      log_success_msg
    fi
  else
    log_warning_msg "Craftbukkit is already running!"
    exit 1
  fi
}

server_stop() {
  if server_running; then
    log_daemon_msg "Stopping Minecraft Server" "Craftbukkit"
    sudo -u ${USER} tmux send-keys -t craftbukkit-console "say NOTICE: Server shutting down in 5 seconds!" C-m  >/dev/null 2>&1
    sleep 5
    sudo -u ${USER} tmux send-keys -t craftbukkit-console "save-all" C-m >/dev/null 2>&1
    sleep 1
    sudo -u ${USER} tmux send-keys -t craftbukkit-console "stop" C-m  >/dev/null 2>&1
    sleep 10
    if server_running; then
      logger -t craftbukkit -p local0.crit "Craftbukkit shutdown failed"
      log_failure_msg
      exit 1
    else
      logger -t craftbukkit -p local0.info "Craftbukkit minecraft server stopped"
      log_success_msg
    fi
  else
    log_warning_msg "Craftbukkit is not running!"
    exit 7
  fi
}

case "$1" in
  start)
    server_start
  ;;

  stop)
    server_stop
  ;;

  restart)
    server_stop
    server_start
  ;;

  status)
    if server_running; then
      log_success_msg "Craftbukkit is running"
    else
      log_failure_msg "Craftbukkit is not running!"
      exit 1
    fi
  ;;

  *)
    log_action_msg "Usage: $0 {start|stop|restart|status}"
    exit 1
esac

exit 0