#!/bin/bash
# init-letsencrypt.sh
# Bootstrap SSL certificate for first deployment.
# Run ONCE. After this, certbot auto-renews every 12 hours.

set -e

ENV_FILE=".env.production"
COMPOSE_FILE="docker-compose.prod.yml"
COMPOSE="docker compose --env-file $ENV_FILE -f $COMPOSE_FILE"

# ---------------------------------------------------------------------------
# Read config from .env.production
# ---------------------------------------------------------------------------
DOMAIN=$(grep '^NGINX_DOMAIN=' "$ENV_FILE" | cut -d= -f2 | tr -d ' ')
EMAIL=$(grep '^CERTBOT_EMAIL=' "$ENV_FILE" | cut -d= -f2 | tr -d ' ')

if [ -z "$DOMAIN" ] || [ -z "$EMAIL" ]; then
    echo "ERROR: NGINX_DOMAIN and CERTBOT_EMAIL must be set in $ENV_FILE"
    exit 1
fi

echo "==> Domain : $DOMAIN"
echo "==> Email  : $EMAIL"
echo ""

# ---------------------------------------------------------------------------
# Step 0: Skip bootstrap if a real cert already exists
# ---------------------------------------------------------------------------
echo "==> Checking for existing certificates..."
if $COMPOSE run --rm --entrypoint sh certbot \
    -c "test -f /etc/letsencrypt/live/$DOMAIN/fullchain.pem"; then
    echo "==> Certificates already exist. Starting nginx..."
    $COMPOSE up -d --wait nginx
    echo "==> Done. nginx is running with the existing certificate."
    exit 0
fi

echo "==> No certificates found. Starting bootstrap..."
echo ""

# ---------------------------------------------------------------------------
# Step 1: Create a temporary self-signed certificate so nginx can start.
#         nginx refuses to start if the ssl_certificate path does not exist.
# ---------------------------------------------------------------------------
echo "==> [1/4] Creating temporary self-signed certificate..."
$COMPOSE run --rm --entrypoint sh certbot -c \
    "mkdir -p /etc/letsencrypt/live/$DOMAIN && \
     openssl req -x509 -nodes -newkey rsa:4096 -days 1 \
     -keyout /etc/letsencrypt/live/$DOMAIN/privkey.pem \
     -out    /etc/letsencrypt/live/$DOMAIN/fullchain.pem \
     -subj   /CN=localhost \
     -quiet"

# Verify the cert was actually created before continuing
if ! $COMPOSE run --rm --entrypoint sh certbot \
    -c "test -f /etc/letsencrypt/live/$DOMAIN/fullchain.pem"; then
    echo "ERROR: Failed to create temporary certificate. Check the certbot image."
    exit 1
fi
echo "==> Temporary certificate created."

# ---------------------------------------------------------------------------
# Step 2: Start nginx (and all backend dependencies).
#         --wait blocks until every health check passes.
# ---------------------------------------------------------------------------
echo "==> [2/4] Starting nginx and backend services..."
$COMPOSE up -d --wait nginx
echo "==> nginx is up."

# ---------------------------------------------------------------------------
# Step 3: Request the real certificate from Let's Encrypt.
#         The certbot image uses certbot as its entrypoint — pass certonly
#         and flags directly as the command.
# ---------------------------------------------------------------------------
echo "==> [3/4] Requesting SSL certificate from Let's Encrypt..."
$COMPOSE run --rm certbot certonly \
    --webroot \
    --webroot-path=/var/www/certbot \
    --email "$EMAIL" \
    --agree-tos \
    --no-eff-email \
    -d "$DOMAIN"

# ---------------------------------------------------------------------------
# Step 4: Reload nginx so it picks up the real certificate.
# ---------------------------------------------------------------------------
echo "==> [4/4] Reloading nginx with the real certificate..."
$COMPOSE exec nginx nginx -s reload

echo ""
echo "===================================================================="
echo " SSL certificate obtained successfully!"
echo " Site is live at: https://$DOMAIN"
echo ""
echo " Next step: run 'make prod-up' to start all remaining services."
echo "===================================================================="