#!/usr/bin/env bash
# ------------------------------------------------------------------
#  Docker + Compose
#  Source:       https://server-installer.de/scripts/docker
#  Version:      v2.1.0
#  Last updated: 2026-09-12
#  Target OS:    Debian 11, Debian 12, Ubuntu 22.04, Ubuntu 24.04
# ------------------------------------------------------------------
set -euo pipefail

log() { printf '\033[36m==>\033[0m %s\n' "$*"; }

if [[ $EUID -ne 0 ]]; then
  echo "Please run as root (sudo)." >&2
  exit 1
fi

# Arguments
ADD_USER=""
while [[ $# -gt 0 ]]; do
  case "$1" in
    --user) ADD_USER="$2"; shift 2 ;;
    *) echo "Unknown argument: $1" >&2; exit 1 ;;
  esac
done

log "Removing conflicting packages"
for pkg in docker.io docker-doc docker-compose podman-docker containerd runc; do
  apt-get remove -y "$pkg" >/dev/null 2>&1 || true
done

log "Adding Docker's official GPG key"
apt-get update -qq
apt-get install -y -qq ca-certificates curl
install -m 0755 -d /etc/apt/keyrings
. /etc/os-release
curl -fsSL "https://download.docker.com/linux/${ID}/gpg" -o /etc/apt/keyrings/docker.asc
chmod a+r /etc/apt/keyrings/docker.asc

log "Adding the apt repository"
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] \
  https://download.docker.com/linux/${ID} ${VERSION_CODENAME} stable" \
  > /etc/apt/sources.list.d/docker.list

log "Installing Docker Engine and Compose"
apt-get update -qq
apt-get install -y -qq docker-ce docker-ce-cli containerd.io \
  docker-buildx-plugin docker-compose-plugin
systemctl enable --now docker

if [[ -n "$ADD_USER" ]]; then
  usermod -aG docker "$ADD_USER"
  log "Added $ADD_USER to the docker group (log in again to apply)"
fi

docker --version
docker compose version

log "Done."