#!/bin/bash

if [ -z "$DOMAIN" ]; then
  echo "Error: DOMAIN environment variable is not set"
  echo "Usage: DOMAIN=yourdomain.com EMAIL=your@email.com ./init-letsencrypt.sh"
  exit 1
fi

if [ -z "$EMAIL" ]; then
  echo "Error: EMAIL environment variable is not set"
  echo "Usage: DOMAIN=yourdomain.com EMAIL=your@email.com ./init-letsencrypt.sh"
  exit 1
fi

echo "### Initializing Let's Encrypt for domain: $DOMAIN"
echo "### Email: $EMAIL"

data_path="./certbot"
rsa_key_size=4096
staging=0

if [ -d "$data_path/conf/live/$DOMAIN" ]; then
  read -p "Existing certificate found for $DOMAIN. Continue and replace? (y/N) " decision
  if [ "$decision" != "Y" ] && [ "$decision" != "y" ]; then
    exit
  fi
fi

if [ ! -e "$data_path/conf/options-ssl-nginx.conf" ] || [ ! -e "$data_path/conf/ssl-dhparams.pem" ]; then
  echo "### Downloading recommended TLS parameters ..."
  mkdir -p "$data_path/conf"
  curl -s https://raw.githubusercontent.com/certbot/certbot/master/certbot-nginx/certbot_nginx/_internal/tls_configs/options-ssl-nginx.conf > "$data_path/conf/options-ssl-nginx.conf"
  curl -s https://raw.githubusercontent.com/certbot/certbot/master/certbot/certbot/ssl-dhparams.pem > "$data_path/conf/ssl-dhparams.pem"
  echo
fi

echo "### Creating dummy certificate for $DOMAIN ..."
path="/etc/letsencrypt/live/$DOMAIN"
mkdir -p "$data_path/conf/live/$DOMAIN"
docker compose -f docker-compose.prod.yml run --rm --entrypoint "\
  openssl req -x509 -nodes -newkey rsa:$rsa_key_size -days 1\
    -keyout '$path/privkey.pem' \
    -out '$path/fullchain.pem' \
    -subj '/CN=localhost'" certbot
echo

echo "### Starting nginx ..."
docker compose -f docker-compose.prod.yml up --force-recreate -d nginx
echo

echo "### Deleting dummy certificate for $DOMAIN ..."
docker compose -f docker-compose.prod.yml run --rm --entrypoint "\
  rm -Rf /etc/letsencrypt/live/$DOMAIN && \
  rm -Rf /etc/letsencrypt/archive/$DOMAIN && \
  rm -Rf /etc/letsencrypt/renewal/$DOMAIN.conf" certbot
echo

echo "### Requesting Let's Encrypt certificate for $DOMAIN ..."
domain_args="-d $DOMAIN"

case "$staging" in
  1) staging_arg="--staging" ;;
  *) staging_arg="" ;;
esac

docker compose -f docker-compose.prod.yml run --rm --entrypoint "\
  certbot certonly --webroot -w /var/www/certbot \
    $staging_arg \
    $domain_args \
    --email $EMAIL \
    --rsa-key-size $rsa_key_size \
    --agree-tos \
    --force-renewal" certbot
echo

echo "### Enabling SSL configuration..."
envsubst '${DOMAIN}' < nginx/conf.d/app-ssl.conf.template > nginx/conf.d/app-ssl.conf
rm nginx/conf.d/app.conf

echo "### Reloading nginx ..."
docker compose -f docker-compose.prod.yml exec nginx nginx -s reload

echo "### Done! Your site is now secured with HTTPS"