#!/bin/bash
# license: gpl-3

if [[ -z $(sudo systemctl status systemd-networkd | grep -e "dead") ]];then
    if [[ $(ls -l /etc/systemd/network | wc -l) != 0 ]];then
        echo "warning, there already are configs present"
        echo "do you want to continue? (Y/n)"
        read continue
        if [[ "$continue" == y ]] || [[ "$continue" == yes ]] || [[ -z "$continue" ]];then
            touch "/etc/systemd/network/10-ethernet.network"
            echo "[Match]" >> "/etc/systemd/network/10-ethernet.network"
            echo "Do you want to configure by Interfacename or MAC? (ifn/MAC)"
            read choice1
            if [[ "$choice1" =~ "ifn" ]];then
                echo "======================"
                echo "Please type out the Interfacename"
                echo "======================"
                ip link show
                read interface
                echo "Name=$interface" >> "/etc/systemd/network/10-ethernet.network"
                echo "" >> "/etc/systemd/network/10-ethernet.network"
            elif [[ "$choice1" =~ "mac" ]];then
                echo "======================"
                echo "Please type out the MAC-Adress"
                echo "======================"
                read mac
                echo "MACAdress=$mac" >> "/etc/systemd/network/10-ethernet.network"
                echo "" >> "/etc/systemd/network/10-ethernet.network"
            else
                echo "no proper input provided"
                exit
            fi
            echo "[Network]" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the IP-Adress you want to set (with CIDR)"
            echo "======================"
            read ipstatic
            echo "Address=$ipstatic" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the Gateway adress"
            echo "======================"
            read gateway
            echo "Gateway=$gateway" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the main DNS address (blank for none)"
            echo "======================"
            read dns
            if [[ -z "$dns" ]];then
                echo "======================"
                echo "Interface has been configured"
                echo "restart systemd-networkd to apply the profile"
                echo "======================"
                exit
            fi
            echo "DNS=$dns" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Interface has been configured"
            echo "restart systemd-networkd to apply the profile"
            echo "======================"
            exit
        else
            exit
        fi
    else
            touch "/etc/systemd/network/10-ethernet.network"
            echo "[Match]" >> "/etc/systemd/network/10-ethernet.network"
            echo "Do you want to configure by Interfacename or MAC? (ifn/MAC)"
            read choice1
            if [[ "$choice1" =~ "ifn" ]];then
                echo "======================"
                echo "Please type out the Interfacename"
                echo "======================"
                ip link show
                read interface
                echo "Name=$interface" >> "/etc/systemd/network/10-ethernet.network"
                echo "" >> "/etc/systemd/network/10-ethernet.network"
            elif [[ "$choice1" =~ "mac" ]];then
                echo "======================"
                echo "Please type out the MAC-Adress"
                echo "======================"
                read mac
                echo "MACAdress=$mac" >> "/etc/systemd/network/10-ethernet.network"
                echo "" >> "/etc/systemd/network/10-ethernet.network"
            else
                echo "no proper input provided"
                exit
            fi
            echo "[Network]" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the IP-Adress you want to set (with CIDR)"
            echo "======================"
            read ipstatic
            echo "Address=$ipstatic" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the Gateway adress"
            echo "======================"
            read gateway
            echo "Gateway=$gateway" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Please type out the main DNS address (blank for none)"
            echo "======================"
            read dns
            if [[ -z "$dns" ]];then
                echo "======================"
                echo "Interface has been configured"
                echo "restart systemd-networkd to apply the profile"
                echo "======================"
                exit
            fi
            echo "DNS=$dns" >> "/etc/systemd/network/10-ethernet.network"
            echo "======================"
            echo "Interface has been configured"
            echo "restart systemd-networkd to apply the profile"
            echo "======================"
            exit
    fi
else
    echo "systemd-networkd is not running"
    exit
fi