#!/bin/bash
# /etc/init.d/minecraft
# version 0.4.1 2015-05-07 (YYYY-MM-DD)
#
### BEGIN INIT INFO
# Provides:   minecraft
# Required-Start: $local_fs $remote_fs screen-cleanup
# Required-Stop:  $local_fs $remote_fs
# Should-Start:   $network
# Should-Stop:    $network
# Default-Start:  2 3 4 5
# Default-Stop:   0 1 6
# Short-Description:    Minecraft server
# Description:    Starts the minecraft server
### END INIT INFO

### SETTINGS
#
# Server Name
SERVERNAME='craftbukkit-1.8.8'
# Linux Username
USERNAME='minecraft'
# Server Root Folder
MCPATH="/home/Minecraft"
# Server Jar File
SERVERJAR="$SERVERNAME.jar"
# Max RAM to Allocate
RAM='2G'
# Server Java Command
INVOCATION="java -Xmx${RAM} -Xms1G -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=128M -jar $SERVERJAR nogui"
# Minecraft Worlds
WORLDS=("world" "world_nether" "world_the_end")
# Backup Folder
BACKUPPATH="/home/$USERNAME/Backups/$SERVERNAME"
# Vote Message
VOTECMD="say Have you voted today? Use command /vote"

ME=`whoami`
as_user() {
        echo "$1"
        if [ $ME == $USERNAME ] ; then
                bash -c "$1"
        else
                su - $USERNAME -c "$1"
        fi
}

mc_start() {
        if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
        then
                echo "$SERVERJAR is already running."
        else
                echo "Starting $SERVERJAR..."
                cd $MCPATH
                as_user "cd $MCPATH && screen -dmS $SERVERNAME $INVOCATION"
                # Wait 5 seconds to start up
                sleep 5
                if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
                then
                        # Print output
                        tail -n $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`] "$MCPATH/logs/latest.log"
                else
                        echo "Could not start $SERVERJAR."
                fi
        fi
}

mc_stop() {
        if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
        then
                pre_log_len=`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`
                echo "$SERVERJAR is running. Stopping server..."
                as_user "screen -p 0 -S $SERVERNAME -X eval 'stuff \"stop\"\015'"
                # Wait 10 seconds to finish stopping
                sleep 10
                # Print output
                tail -n $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/logs/latest.log"
        else
                echo "$SERVERJAR is not running..."
        fi
}

mc_command() {
        command="$1";
        if [ "$command" == "" ]
        then
                echo "Usage: server.sh [ start | stop | restart | status | save | backup | \"command\" ]"
                return
        fi
        if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
        then
                pre_log_len=`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`
                echo "$SERVERJAR is running. Executing $command..."
                as_user "screen -p 0 -S $SERVERNAME -X eval 'stuff \"$command\"\015'"
                # Wait 1 second for the command to run and print to the log file
sleep 1
                # Print output
                tail -n $[`wc -l "$MCPATH/logs/latest.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/logs/latest.log"
        else
                echo "$SERVERJAR is not running..."
        fi
}

mc_saveall() {
        if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
        then
                echo "$SERVERJAR is running. Saving the world..."
                # Save the World
                as_user "screen -p 0 -S $SERVERNAME -X eval 'stuff \"save-all\"\015'"
                # Say World saved.
                as_user "screen -p 0 -S $SERVERNAME -X eval 'stuff \"say World saved.\"\015'"
                # Save WorldGuard Regions
                as_user "screen -p 0 -S $SERVERNAME -X eval 'stuff \"region save\"\015'"
                sync
                # Wait 10 seconds to finish saving
                sleep 10
                echo "World saved."
        else
                echo "$SERVERJAR was not running. Noting to save."
 fi
}

mc_backup() {
        NOW=`date "+%Y-%m-%d_%Hh%M"`

        # Backup Server World
        for world in ${!WORLDS[*]}
        do
                echo "Backing up world ${WORLDS[$world]}..."
                as_user "cd $MCPATH && zip -r $BACKUPPATH/${WORLDS[$world]}_${NOW}.zip ${WORLDS[$world]}"
                echo "${WORLDS[$world]} has been archived."
        done

        # Backup Server Plugins
        echo "Backing up server plugins..."
        as_user "cd $MCPATH && zip -r --exclude=plugins/dynmap/web/tiles/* $BACKUPPATH/Plugins_${NOW}.zip plugins"
        echo "The plugins have been archived."

        # Backup Server Data (Bans, White-list, etc...)
        echo "Backing up server data..."
        as_user "cd $MCPATH && zip $BACKUPPATH/Server_${NOW}.zip *"
        echo "The server data has been archived."
 echo "Server backup complete."
}

mc_status() {
        if pgrep -u $USERNAME -f $SERVERJAR > /dev/null
        then
                echo "$SERVERJAR is running."
        else
                echo "$SERVERJAR is not running."
        fi
}

#Start-Stop here
case "$1" in
        stop)
                mc_stop
        ;;
        restart)
                mc_stop
                mc_start
        ;;
        spigot-restart)
                # Wait 30 seconds for the server to fully stop then start again
                sleep 30
                mc_start
        ;;
        save)
                mc_saveall
        ;;
        backup)
                mc_saveall
                mc_command "save-off"
                mc_backup
                mc_command "save-on"
        ;;
        status)
                mc_status
        ;;
        votemsg)
                mc_command $VOTECMD
        ;;
        start)
                mc_start
        ;;
        *)
                echo "command received"
                mc_command "$*"
        ;;
esac

exit 0