#!/bin/bash

printf "Better to run as root, because of permisions handeling.\n"

sleep 2

home=$(pwd)


### RAM ###

printf "How much of RAM are you willing to allocate in GB (Max) [4G/?G]: \n"
read maxRam

printf "How little you want to let RAM go down to in GB (Min) [1G/?G]: \n"
read minRam

### Proxy ###

printf "Are you planing to use Velocity proxy to acces this server? [Y/n]: \n"
read ansVeloProxy

if [[ "$ansVeloProxy" =~ ("y"|"Y") || -z $ansVeloProxy ]]; then
	
	printf "Do you wish to set up moder forwarding? [Y/n]: \n"
	read ansModernFarward
fi

printf "Do you want to set up SkinRestorer [Y/n]: \n"
read ansSkinRestorer


printf "Do you want to set up PlayerSync [Y/n]: \n"
read ansPlayerSync

sleep 2

### Update ###

printf "\n+ Starting to upgrade base system\n\n"

apt update
apt upgrade -y
apt autoremove --purge -y


### Installing depandencies ###

printf "\n+ Installing depandencies \n\n" 
 apt install openjdk-21-jre-headless screen p7zip-full vim jq wget -y


### User and groupe managment ###

printf "\n+ Creating user minecraft and basic file structure"
groupadd minecraft

useradd --system --shell /usr/sbin/nologin --home /opt/minecraft -g minecraft minecraft

###  File strukture ###
mkdir /opt/minecraft 

cd /opt/minecraft/

### Download forge server ###
printf "+ Downloading and installing Forge 1.21.1 \n \n"
wget https://maven.neoforged.net/releases/net/neoforged/neoforge/21.1.217/neoforge-21.1.217-installer.jar

mv *neoforge*.jar NeoForge.jar

### Installing server ###

java -Xms512M -Xmx2048M -jar NeoForge.jar --installServer

### RAM configuration ###

if [[ "$minRam" > "$maxRam" ]]; then
	pritf "\n You allocated too low max ram or too much min ram. Manual intervention at the end will be needed\n"
	echo "-Xmx?G # in place of ? put number of RAM you want to set ass maximum"
	$maxRam="Error"
elif [[ "$maxRam" =~ ("G"|"M") ]]; then
	printf "\n+ Allocating $maxRam as RAM maximum."
	echo "-Xmx$maxRam" >> user_jvm_args.txt
elif [[ -z $maxRam ]]; then
	$maxRam=4G
	printf "\n+ Allocating $MaxRam as RAM maximum"
	echo "-Xmx$maxRam" >> user_jvm_args.txt
elif [[ ! "$maxRam" =~ ("G"|"MB") ]]; then
	printf "\n+ Allocating ${maxRam}G as RAM maximum"
	echo "-Xmx${maxRam}G" >> user_jvm_args.txt
else
	pritnf "\n \n!!! Sorry I have no idea what are you trying to do :/ Manual intervention will be needed at the end \n"
	$maxRam="Error"
	echo "-Xmx?G # in place of ? put number of RAM you want to set ass maximum"
fi


if [[ "$minRam" > "$maxRam" ]]; then
	echo "-Xms?G # in place of ? put number of RAM you want to se ass minimum"
elif [[ "$minRam" =~ ("G"|"M") ]]; then
	printf "\n+ Allocating $minRam as RAM minimum."
	echo "-Xms$minRam" >> user_jvm_args.txt
elif [[ -z $minRam ]]; then
	$minRam=1G
	printf "\n+ Allocating $minRam as RAM minimum"
	echo "-Xms$minRam" >> user_jvm_args.txt
elif [[ ! "$minRam" =~ ("G"|"MB") ]]; then
	printf "Allocating ${minRam}G as RAM maximum"
	echo "-Xms${minRam}G" >> user_jvm_args.txt
else
	pritnf "\n!!! Sorry I have no idea what are you trying to do :/ Manual intervention will be needed at the end \n"
	$minRam="Error"
	echo "-Xms?G # in place of ? put number of RAM you want to set ass minimum"
fi

### Other configuraton ###
echo eula=true > eula.txt
mv $home/data/server-icon.png $home/data/server.properties /opt/minecraft/


### Mods handling ###
mkdir /opt/minecraft/mods
mkdir /opt/minecraft/config

while IFS= read -r line; do
	if [[ $(echo $line | jq -r '.env.server') == "required" ]]; then
		dw=$(echo $line | jq -r '.downloads[0]')
		#wget -O mods/ $dw
	fi
done < <(jq -c '.files[]' 'data/mr.index.json')

while IFS= read -r line; do
	if [[ $(echo $line | jq -r '.env.server') == "required" ]]; then
		dw=$(echo $line | jq -r '.downloads[0]')
		#wget -O mods/ $dw
	fi
done < <(jq -c '.files[]' 'data/cf.index.json')

# adds mode to help comunicate with VeloProxy
if [[ "$ansVeloProxy" =~ ["y"|"Y"] || -z $ansVeloProxy ]]; then
	wget https://cdn.modrinth.com/data/vDyrHl8l/versions/82bwNhmQ/proxy-compatible-forge-1.2.1.jar
	mv proxy-compatible-forge*.jar /opt/minecraft/mods/

	#if [[ "$ansModernFarward" =~ ["y"|"Y"] || -z $ansModernFarward ]]; then
	#	mkdir /opt/minecraft/config
	#	mv data/pcf-common.toml /opt/minecraft/config/ #TODO Research this shit
	#		# TODO Modern forwardig? https://cdn.modrinth.com/data/RT18TcxA/versions/fMMrBXPc/neovelocity-neoforge-1.2.4.jar
	#fi
fi


# adds aditional mods
if [[ "$ansSkinRestorer" =~ ["y"|"Y"] || -z $ansSkinRestorer ]]; then
	wget https://cdn.modrinth.com/data/ghrZDhGW/versions/NNAoiEfu/skinrestorer-2.4.3%2B1.21-neoforge.jar
	mv skinrestorer*.jar /opt/minecraft/mods/
fi

if [[ "$ansPlayerSync" =~ ["y"|"Y"] || -z $ansPlayerSync ]]; then
	wget https://cdn.modrinth.com/data/4pmkajBP/versions/mK3hQ8Vs/playersync-1.21.1-2.1.5.jar
	mv playersync*.jar /opt/minecraft/mods
	mv $home/data/playersync-common.toml /opt/minecraft/config/

	 rndr=$((RANDOM % (32765-10000+1)+10000))
	 sed -i "s/1234567890/$rndr$rndr/g" config/playersync-common.toml #gens uniqe id
	#TODO more configuration - password, user_name
fi


### Permisions ###
printf "\n+ Permision handeling\n"
chown -R minecraft:minecraft /opt/minecraft

### SystemD service ###
printf "+ Preparign systemD service\n"
mv data/mc-forge.service /etc/systemd/system/

systemctl daemon-reload


  ### Error handeling ###
if [[ "$minRam" = "Error" || "$maxRam" = "Error" ]]; then

	printf "\n Encountred some eror in Ram settings"
	printf "\n Manual configuration needed" 
	printf "\n Open /opt/minecraft/user_jvm_args.txt in your favorite editor. File contains more instructions"

else
	
	printf "Do you want to start server right now? [Y/n]: \n"
	read startServer

	if [[ "$startServer" =~ ("y"|"Y") || -z $startServer ]]; then
		systemctl start mc-forge.serice
	fi
	
	systemctl enable mc-forge

fi

printf "\n+ Done, thanks for your time. It is goode idea to chack if everythink is alright by running:"
printf "\nsystemctl status mc-forge"
printf "\nsu minecraft -s /bin/bash"
printf "\n+ it is good idea to have some fun with screen before trying to open minecraft conesole 'screen -r' while loged wia minecraft user"