#!/bin/bash -eu

# Ensure the script runs with root privileges
if [ "$EUID" -ne 0 ]; then
    echo "Please run this script as root"
    exit 1
fi
####################
sudo apt update && sudo apt upgrade
# Install curl & git for later:
sudo apt install curl git -y
############################################################################
#                                                                          #
# setup a Linux user                          #
#                                                                          #
############################################################################
read -p "Enter a linux username to make: " LINUX_USERNAME
export LINUX_USERNAME=$LINUX_USERNAME
read -p "Enter a password for $LINUX_USERNAME: " LINUX_PASSWORD
export LINUX_PASSWORD=$LINUX_PASSWORD
# setup:
useradd $LINUX_USERNAME
mkdir /home/$LINUX_USERNAME
chown $LINUX_USERNAME:$LINUX_USERNAME /home/$LINUX_USERNAME -R
# activate linux shell for the user:
look_for="/home/$LINUX_USERNAME:/bin/sh"
change_to="/home/$LINUX_USERNAME:/bin/bash"
sudo sed -i "s|$look_for|$change_to|g" /etc/passwd
# Change the password
echo "$LINUX_USERNAME:$LINUX_PASSWORD" | chpasswd
# Verify the change
if [ $? -eq 0 ]; then
    echo "Password set successfully for user $LINUX_USERNAME."
else
    echo "Failed to set password for user $LINUX_USERNAME."
fi
# Make a sudo user:
usermod -aG sudo $LINUX_USERNAME
############################################################################
#                                                                          #
# DNS, undo google. undo cloudflare                          #
#                                                                          #
############################################################################
sudo sed -i 's/1.1.1.1/9.9.9.9/g' /etc/network/if-up.d/custom-resolv
sudo sed -i 's/8.8.8.8/9.9.9.10/g' /etc/network/if-up.d/custom-resolv
sudo sed -i 's/1.1.1.1/9.9.9.9/g' /etc/netplan/50-cloud-init.yaml
sudo sed -i 's/8.8.8.8/9.9.9.10/g' /etc/netplan/50-cloud-init.yaml
sudo sed -i 's/1.1.1.1/9.9.9.9/g' /etc/resolv.conf
sudo sed -i 's/8.8.8.8/9.9.9.10/g' /etc/resolv.conf
sudo sudo apt install dnsutils -y
dig
read -p "do you see google or cloudflare in the above DNS servers? (yes/no): " REPLY_ON_GOOGLE_CLOUDFLARE
# Check the user's answer
if [[ "$REPLY_ON_GOOGLE_CLOUDFLARE" == "yes" ]]; then
    echo "This means you need to reboot for it to take effect.  Rebooting now"
    reboot
elif [[ "$REPLY_ON_GOOGLE_CLOUDFLARE" == "no" ]]; then
    echo "ok great. you don't need to reboot"
    # switch to the user:
    su $LINUX_USERNAME
else
    echo "Please answer with 'yes' or 'no'."
fi