#!/bin/bash

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

sleep 2


### Firewall 

printf "Do you want to set up firewall rules by iptables? [Y/n]: \n"
read ansFirewallSetup


if [[ "$ansFirewallSetup" =~ ("N"|"n") ]]; then

	printf "+ Thanks, working on next bit\n"


elif [[ "$ansFirewallSetup" =~ ("Y"|"y") || -z $ansFirewallSetup ]]; then
	
	printf "Do you want to block non-Tailscale ssh connections? [Y/n]: "
	read sshBlockRange


	if [[ "$sshBlockRange" =~ ("n"|"N") ]]; then
	
		printf "If you want input your own IP range [N/range]\n"
		read sshRange

		if [[ "$sshRange" =~ ("n"|"N") || -z $sshRange ]]; then
			printf "+ Making your SSH connections wide and open. Think about it. /n"
			ipList="*"
		else
			printf "+ Accepting SSH connections only on these ip's: $sshRange\n"
			ipList="$sshRange"
		fi

		
fi

### Update 

sleep 2

apt update && apt upgrade -y

apt install openjdk-17-jre-headless screen


if [[ "$ansFirewallSetup" =~ ("Y"|"y") || -z $ansFirewallSetup  ]]; then
	 apt install iptables -y
fi

### User managment 

groupadd velocity

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


### File structure 

mkdir /opt/velocity

mv data/velocity*.jar start.sh /opt/velocity/

mkdir /opt/velocity/plugins
mv data/Ambassador*.jar /opt/velocity/plugins

mv data/velocity.toml /opt/velocity/
mv data/forwarding.secret /opt/velocity/



### Permisions 

chown -R velocity:velocity  /opt/velocity/



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

systemctl daemon-reload

### integration of Maxopoly's instructions on firewall ### needs update

if [[ "$ansFirewallSetup" =~ ("Y"|"y") || -z "$ansFirewallSetup" ]]; then
	
		printf "+ Executing firewall setup"

		iptables -P INPUT ACCEPT #Clears existing rules

		iptables -A INPUT -i lo -j ACCEPT #Allow loopback

		iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT #Allow continuing connections

		iptables -A INPUT -p tcp --dport 25577 -j ACCEPT #Allow Velocity port

		if [[ "$ipList" = "*" ]]; then
			
			### Wide and open

			iiptables -A INPUT -p tcp --dport 22 j ACCEPT
		
		elif [[! "$ipList" -z ]]; then

			### Manual IP range

			iptables -A INPUT -p tcp --dport 22 --source $ipList -j ACCEPT
		fi

		iptables -L ### Good place to paste a manual check to not lock yourself out 

		printf "\n Does it looks right? [Y/n]: "
			read ansFirewallOK

		if [[ "$ansFirewallOK" =~ ("Y"|"y") || -z "$ansFirewallOK" ]]; then	
		
			iptables -P INPUT DROP #Disallow everythink else

			iptables -P FORWARD DROP #Block all forwarding

			iptables -P OUTPUT ACCEPT #Allow all outgouing
	
			 apt install iptables-persistent -y

		else
			
			printf "\nOK it is time for manual configuration"
			printf "\nAfter you are done ramamber to run 'apt install iptables-persistent' to save your config. System will automaticly remove your work after restart"

		fi
fi

### Start service ### needs update

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

### needs update
printf "\nsystemctl status mc-forge"
printf "\nsu velocity -s /bin/bash"