#!/bin/bash
# Kubernetes Deployment Script for 3-Node Cluster
# Usage: ./deploy.sh

set -e

echo "🚀 Deploying to Kubernetes (3-Node Cluster)..."

# Check if kubectl is available
if ! command -v kubectl &> /dev/null; then
    echo "❌ kubectl not found. Please install kubectl first."
    exit 1
fi

# Check cluster connection
echo "📡 Checking Kubernetes cluster connection..."
kubectl cluster-info || {
    echo "❌ Cannot connect to Kubernetes cluster. Please configure kubectl."
    exit 1
}

# Check node count
NODE_COUNT=$(kubectl get nodes --no-headers | wc -l)
echo "📊 Cluster has $NODE_COUNT node(s)"

# Apply namespace
echo "📦 Creating namespace..."
kubectl apply -f manifests/namespace.yaml

# Apply secrets
echo "🔐 Creating secrets..."
kubectl apply -f manifests/secrets.yaml

# Apply FastAPI
echo "🐍 Deploying FastAPI backend..."
kubectl apply -f manifests/fastapi-deployment.yaml
kubectl apply -f manifests/fastapi-service.yaml
kubectl apply -f manifests/fastapi-hpa.yaml

# Apply Workers
echo "👷 Deploying NATS workers..."
kubectl apply -f manifests/worker-deployment.yaml
kubectl apply -f manifests/worker-hpa.yaml

# Apply Gateway (optional - only if Gateway API is installed)
read -p "Deploy Gateway API? (requires Gateway API controller) [y/N] " -n 1 -r
echo
if [[ $REPLY =~ ^[Yy]$ ]]; then
    echo "🚪 Deploying Gateway API..."
    kubectl apply -f manifests/gateway.yaml
fi

echo ""
echo "✅ Deployment complete!"
echo ""
echo "📋 Check status:"
echo "   kubectl get pods -n nats-backend -o wide"
echo "   kubectl get nodes"
echo "   kubectl get hpa -n nats-backend"
echo ""
echo "📊 View pod distribution across nodes:"
echo "   kubectl get pods -n nats-backend -o wide | grep -E 'NAME|fastapi|worker'"
echo ""
echo "📝 View logs:"
echo "   kubectl logs -f deployment/fastapi-backend -n nats-backend"
echo "   kubectl logs -f deployment/nats-worker -n nats-backend"
echo ""