#!/bin/bash
set -euo pipefail

exec > >(tee /var/log/cloud-init-app.log) 2>&1
echo "=== OCI CIS Agent cloud-init started at $(date) ==="

# -----------------------------------------------------------------------------
# 1. Install Docker CE + docker-compose-plugin
# -----------------------------------------------------------------------------
echo ">>> Installing Docker CE..."
dnf install -y dnf-utils
dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
dnf install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin --allowerasing

systemctl enable docker
systemctl start docker

echo ">>> Docker version: $(docker --version)"
echo ">>> Docker Compose version: $(docker compose version)"

# -----------------------------------------------------------------------------
# 2. Wait for block device
# -----------------------------------------------------------------------------
DATA_DEVICE="${data_device}"
echo ">>> Waiting for block device $DATA_DEVICE..."
ATTEMPTS=0
MAX_ATTEMPTS=60
while [ ! -e "$DATA_DEVICE" ] && [ $ATTEMPTS -lt $MAX_ATTEMPTS ]; do
  echo "  Waiting for $DATA_DEVICE (attempt $((ATTEMPTS+1))/$MAX_ATTEMPTS)..."
  sleep 5
  ATTEMPTS=$((ATTEMPTS+1))
done

if [ ! -e "$DATA_DEVICE" ]; then
  echo "ERROR: Block device $DATA_DEVICE not found after $MAX_ATTEMPTS attempts"
  exit 1
fi
echo ">>> Block device $DATA_DEVICE is available"

# -----------------------------------------------------------------------------
# 3. Format and mount /data
# -----------------------------------------------------------------------------
if ! blkid "$DATA_DEVICE" | grep -q ext4; then
  echo ">>> Formatting $DATA_DEVICE as ext4..."
  mkfs.ext4 -F "$DATA_DEVICE"
fi

mkdir -p /data
mount "$DATA_DEVICE" /data

# Add to fstab if not already present
if ! grep -q "$DATA_DEVICE" /etc/fstab; then
  echo "$DATA_DEVICE /data ext4 defaults,_netdev,nofail 0 2" >> /etc/fstab
fi

echo ">>> /data mounted successfully"
df -h /data

# Create application data directories
mkdir -p /data/db /data/configs /data/reports /data/terraform /data/wallets

# -----------------------------------------------------------------------------
# 4. Docker login to OCIR
# -----------------------------------------------------------------------------
OCIR_ENDPOINT="${ocir_region}.ocir.io"
echo ">>> Logging into OCIR at $OCIR_ENDPOINT..."
echo '${ocir_auth_token}' | docker login "$OCIR_ENDPOINT" \
  -u "${ocir_namespace}/${ocir_username}" \
  --password-stdin

# -----------------------------------------------------------------------------
# 5. Pull images
# -----------------------------------------------------------------------------
BACKEND_IMAGE="$OCIR_ENDPOINT/${ocir_namespace}/${ocir_repo_prefix}/backend:latest"
FRONTEND_IMAGE="$OCIR_ENDPOINT/${ocir_namespace}/${ocir_repo_prefix}/frontend:latest"

echo ">>> Pulling backend image: $BACKEND_IMAGE"
docker pull "$BACKEND_IMAGE"

echo ">>> Pulling frontend image: $FRONTEND_IMAGE"
docker pull "$FRONTEND_IMAGE"

# -----------------------------------------------------------------------------
# 6. Write docker-compose.yml
# -----------------------------------------------------------------------------
APP_DIR="/opt/oci-cis-agent"
mkdir -p "$APP_DIR"

cat > "$APP_DIR/docker-compose.yml" <<'COMPOSE_EOF'
services:
  backend:
    image: ${ocir_region}.ocir.io/${ocir_namespace}/${ocir_repo_prefix}/backend:latest
    container_name: cisagent-backend
    restart: unless-stopped
    environment:
      - APP_SECRET=${app_secret}
      - JWT_EXPIRY_HOURS=${jwt_expiry_hours}
      - CORS_ORIGINS=${cors_origins}
      - TZ=${app_timezone}
    volumes:
      - /data:/data
    mem_limit: 4g
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8000/api/health"]
      interval: 30s
      timeout: 10s
      retries: 3
      start_period: 30s
    networks:
      - agent-net

  frontend:
    image: ${ocir_region}.ocir.io/${ocir_namespace}/${ocir_repo_prefix}/frontend:latest
    container_name: cisagent-frontend
    restart: unless-stopped
    ports:
      - "8080:80"
    mem_limit: 512m
    depends_on:
      backend:
        condition: service_healthy
    networks:
      - agent-net

networks:
  agent-net:
    driver: bridge
COMPOSE_EOF

echo ">>> docker-compose.yml written to $APP_DIR"

# -----------------------------------------------------------------------------
# 7. Start application
# -----------------------------------------------------------------------------
echo ">>> Starting application with Docker Compose..."
cd "$APP_DIR"
docker compose up -d

# -----------------------------------------------------------------------------
# 8. Health check wait loop
# -----------------------------------------------------------------------------
echo ">>> Waiting for application to become healthy..."
ATTEMPTS=0
MAX_ATTEMPTS=60
while [ $ATTEMPTS -lt $MAX_ATTEMPTS ]; do
  if curl -sf http://localhost:8080/api/health > /dev/null 2>&1; then
    echo ">>> Application is healthy!"
    break
  fi
  echo "  Health check attempt $((ATTEMPTS+1))/$MAX_ATTEMPTS..."
  sleep 10
  ATTEMPTS=$((ATTEMPTS+1))
done

if [ $ATTEMPTS -eq $MAX_ATTEMPTS ]; then
  echo "WARNING: Application did not become healthy within expected time"
  echo ">>> Docker container status:"
  docker compose ps
  echo ">>> Backend logs:"
  docker compose logs backend --tail 50
fi

echo "=== OCI CIS Agent cloud-init finished at $(date) ==="