if [ "$(id -u)" -ne 0 ]; then
    echo "This script must be run as root"
    exit 1
fi

## Remove potential old installation of docker
for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do apt-get remove $pkg; done

## Add Docker's official GPG key:
apt-get install -y ca-certificates
install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/debian/gpg -o /etc/apt/keyrings/docker.asc
chmod a+r /etc/apt/keyrings/docker.asc

## Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  tee /etc/apt/sources.list.d/docker.list > /dev/null
apt-get update

## Install docker
apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
docker run --rm hello-world

## Create docker group if not present
if ! getent group docker > /dev/null; then 
  groupadd docker
fi

## Add argument user to docker group
if [ -n "$1" ]; then
  usermod -aG docker $1
  sudo -i -u $1 docker run --rm hello-world
fi
