#!/usr/bin/env bash
#
# Instalace Docker + Docker Compose plugin na Ubuntu 22.04/24.04
# - oficiální Docker repo
# - non-interactive
# - post-instalace: přidá DEPLOY_USER do docker group
#
# Idempotentní.
#
set -euo pipefail

DEPLOY_USER="${DEPLOY_USER:-deploy}"

[[ $EUID -eq 0 ]] || { echo "Spusť jako root: sudo bash $0" >&2; exit 1; }

# 1. Příprava
apt-get update -qq
apt-get install -y -qq ca-certificates curl gnupg

# 2. Docker GPG klíč
install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
chmod a+r /etc/apt/keyrings/docker.gpg

# 3. Docker repo
ARCH=$(dpkg --print-architecture)
CODENAME=$(. /etc/os-release && echo "${UBUNTU_CODENAME:-$VERSION_CODENAME}")
echo "deb [arch=$ARCH signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $CODENAME stable" \
    > /etc/apt/sources.list.d/docker.list

# 4. Instalace
apt-get update -qq
apt-get install -y -qq docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

# 5. Služba
systemctl enable --now docker
systemctl is-active --quiet docker && echo "✓ Docker běží"

# 6. DEPLOY_USER do docker group (bez sudo pro docker)
if id "$DEPLOY_USER" &>/dev/null; then
    usermod -aG docker "$DEPLOY_USER"
    echo "✓ $DEPLOY_USER přidán do docker group (odhlas se a prihlas pro efekt)"
fi

# 7. Test
docker --version
docker compose version

echo
echo "🎉 Docker nainstalován!"
echo "   Odhlas se a prihlas se jako $DEPLOY_USER pro práci bez sudo."