#!/bin/bash

# ******** minecraft control script ********
# ******** using systemd + screen   ********

# **** configuration ****
user=minecraft
path=/opt/$user
bold="\033[1m"
normal="\033[0m"
red="\033[31m"
green="\033[32m"
yellow="\033[33m"


# **** start of script ****

state()
{
    if [ -r "$path/$2/minecraft_server.jar" ]; then
        systemctl status $1@$2 > /dev/null
	if [ $? -eq 0 ]; then
            return 0
	else
            return 1
	fi
    else
        return 2
    fi
}

usage()
{
    echo -e "usage: mc option <server>\n\n  ${bold}Servers:${normal}"
    servers=$(ls -l $path | grep '^d' | awk '{print $9}')
    for server in $servers; do
        state $user $server
        if [ $? -eq 0 ]; then
            echo -e "    [${green}✓${normal}] $server"
        else
            echo -e "    [${red}✗${normal}] $server"
        fi
    done

    echo -e "\n  ${bold}Options:${normal}
    help                 Print usage message
    status               Print server(s)
    start <server>       Start server instance
    stop <server>        Stop server instance
    console <server>     Connect to server console\n"
}



case "$1" in
    h|help|-h|--help|status|a|-a|--status|l|ls|list|-l|--list)
        usage
        ;;
    s|start|-s|--start)
        if [ $2 ]; then
            state $user $2
	    value=$?
	    if [ $value -eq 0 ]; then
                echo -e "\n  [${yellow}☀${normal}] Server already up.($2)\n"
	    elif [ $value -eq 1 ]; then
                echo -e "\n  [${green}✓${normal}] Starting server.($2)\n"
                sudo systemctl restart $user@$2
	    else
                echo -e "\n  [${red}✗${normal}] Server does not exist.($2)\n"
		exit 1
	    fi
	else
	    echo -e "\n  [${red}✗${normal}] No server given.\n"
	    exit 1
        fi
        ;;
    t|stop|-t|--stop)
	if [ $2 ]; then
            state $user $2
	    value=$?
	    if [ $value -eq 0 ]; then
		echo -e "\n  [${yellow}☀${normal}] Stopping server. Sending 10 second notice.($2)"
	        sudo systemctl stop $user@$2
		echo -e "  [${green}✓${normal}] Stopped server.($2)\n"

            elif [ $value -eq 1 ]; then
                echo -e "\n  [${yellow}☀${normal}] Server already down.($2)\n"
	    else
		echo -e "\n  [${red}✗${normal}] Server does not exist.($2)\n"
                exit 1
	    fi
	else
            echo -e "\n  [${red}✗${normal}] No server given.\n"
	    exit 1
	fi
        ;;
    c|console|-c|--console)
	if [ $2 ]; then
	    state $user $2
            value=$?
	    if [ $value -eq 0 ]; then
   	        echo -e "\n  [${yellow}☀${normal}] Connecting to server console on $user@$2."
		echo -e "  [${yellow}☀${normal}] Exit console with: ${bold}Strg-a d${normal}\n"; sleep 5
	        sudo -u $user /usr/bin/screen -R mc-$2
	    elif [ $value -eq 1 ]; then
		echo -e "\n  [${red}✗${normal}] Server not up.($2)\n"
		exit 1
	    else
		echo -e "\n  [${red}✗${normal}] Server does not exist.($2)\n"
		exit 1
	    fi
	else
            echo -e "\n  [${red}✗${normal}] No server given.\n"
	    exit 1
	fi
        exit 0
        ;;
    *)
	usage
        exit 1
        ;;
esac
exit 0

# **** end of script ****