#!/bin/bash
set -euo pipefail

# Install Caddy web server on Debian/Ubuntu/Raspbian using the official
# Cloudsmith apt repository.
# Follows the official docs:
#   https://caddyserver.com/docs/install#debian-ubuntu-raspbian

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

. /etc/os-release

case "$ID" in
  debian|ubuntu|raspbian) ;;
  *)
    echo "Unsupported distribution: $ID (only Debian, Ubuntu and Raspbian are supported)." >&2
    exit 1
    ;;
esac

ARCH="$(dpkg --print-architecture)"
case "$ARCH" in
  amd64|arm64|armhf) ;;
  *)
    echo "Unsupported architecture: $ARCH" >&2
    exit 1
    ;;
esac

export DEBIAN_FRONTEND=noninteractive

echo "==> Installing prerequisites"
apt-get update
apt-get install -y debian-keyring debian-archive-keyring apt-transport-https curl

echo "==> Adding Caddy's official GPG key"
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
chmod o+r /usr/share/keyrings/caddy-stable-archive-keyring.gpg

echo "==> Adding Caddy apt repository"
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | tee /etc/apt/sources.list.d/caddy-stable.list >/dev/null
chmod o+r /etc/apt/sources.list.d/caddy-stable.list

echo "==> Installing Caddy"
apt-get update
apt-get install -y caddy

echo "Caddy installed. Service status: systemctl status caddy"