#!/bin/bash

#########################
#### Author: Osguot  ####
#### Version: 0.1.3  ####
#########################

#### CHANGELOG ####
#
# *0.1.2 - Added System Java support
#        - Small fixes
# *0.1.3 - Added missed text strings
#
####

#### TODO ####
#
# *Backup manager
# *Launch Java through Screen and full input/output support
# *Autodetect Java
# *Changing runtime arguments (+-)
#
# *Make script "clean-start" compatible
#
####

## Variables
SERVER_DIR="/media/SSD_Data/.minecraft/Servers/OSGMC_v2"
TERMINAL="konsole"
TERMINAL_ARGS="--hide-menubar --hide-tabbar"
# Runtime
JAVA_8="/usr/lib/jvm/java-8-jre/jre/bin/java"
JAVA_8_OPENJDK="/usr/lib/jvm/java-8-openjdk/jre/bin/java"
# JVM Arguments
JVM_ARGS="-Xmx2500m -XX:MaxGCPauseMillis=500 -XX:+UseParallelGC -XX:ParallelGCThreads=4 -XX:+AggressiveOpts"
GAME_ARGS="nogui"

#########################
## Hello message
zenity --info --no-wrap --title="OSGMC Launch Server Script" --text="Hello!\n\nThis script allow you to configure and launch your Minecraft Server (WIP)"

## Choosing runtime
run=$(zenity --list --width=300 --height=200 --radiolist --title="OSGMC Launch Server Script" --text="Please, choose Java Runtime Environment" --column="" --column="Runtime" TRUE "Java 8" FALSE "Java 8 OpenJDK" FALSE "System Default" FALSE "Choose...")
if [ $? -eq "0" ]
then
    if [ "$run" = "Java 8" ]
    then
        RUNTIME=$JAVA_8
    elif [ "$run" = "Java 8 OpenJDK" ]
    then
        RUNTIME=$JAVA_8_OPENJDK
    elif [ "$run" = "System Default" ]
    then
        zenity --info --no-wrap --title="OSGMC Launch Server Script" --text="Warning!\n\nMake sure your System Java is supported by Minecraft."
        RUNTIME="java"
    elif [ "$run" = "Choose..." ]
    then
        zenity --info --no-wrap --title="OSGMC Launch Server Script" --text="Choose Java Runtime Environment executable."
        RUNTIME=`zenity --file-selection --file-filter="java"`
    else
        end
    fi
else
    end
fi

# Detecting Server Version
cd $SERVER_DIR
motd="motd="
SERVER_VERSION_FULL=$(grep "$motd" server.properties)
SERVER_VERSION=$(echo $SERVER_VERSION_FULL | cut -c 6-)

## Changing server version
ver=$(zenity --list --width=300 --height=200 --radiolist --title="OSGMC Launch Server Script" --text="Do you want to change server version?\n\nCurrent version: $SERVER_VERSION" --column="" --column="" TRUE "No" FALSE "Yes")
if [ $? -eq "0" ]
then
    if [ "$ver" != "No" ]
    then
        version=`zenity --forms --title="OSGMC Launch Server Script" --text="Type Server Version [Old: $SERVER_VERSION]" --add-entry="Server Version"`
        if [ $? -eq "0" ]
        then
            if [ -n "$version" ]
            then
                sed -i -e "s/$SERVER_VERSION_FULL/$motd$version/g" server.properties
                SERVER_VERSION=$version
            fi
        fi
    fi
else
    end
fi

## Detecting Forge Version
FORGE=$(find -maxdepth 1 -name "forge*" | cut -c 3-)

## Launch server
function launch {
    # Looping
    ON=true
    until [ $ON = false ]
    do
        $TERMINAL $TERMINAL_ARGS -e $RUNTIME $JVM_ARGS -jar $SERVER_DIR/$FORGE $GAME_ARGS
        loop=$(zenity --list --width=300 --height=200 --radiolist --ok-label="OK" --cancel-label="Cancel" --title="OSGMC Launch Server Script" --text="Server was stopped. What do you do?" --column="" --column="Action" TRUE "Restart" FALSE "Exit")
        if [ $? -eq "0" ]
        then
            if [ "$loop" = "Restart" ]
            then
                ON=true
            else
                ON=false
            fi
        else
            ON=false
        fi
    done

    end
}

function end {
    ## DEBUG
    zenity --info --no-wrap --title="OSGMC Launch Server Script" --text="$SERVER_DIR\n\n$JAVA_8\n\n$JAVA_8_OPENJDK\n\n$RUNTIME\n\n$JVM_ARGS\n\n$FORGE\n\n$GAME_ARGS\n\n$SERVER_VERSION"
    exit 1
}

launch