#!/usr/bin/env bash
set -euo pipefail

# ── Scrum Manager — On-Premise Kubernetes Deploy Script ─────────────────────
# Run from the project root: bash k8s/overlays/on-premise/deploy.sh
# ────────────────────────────────────────────────────────────────────────────

OVERLAY="k8s/overlays/on-premise"
NAMESPACE="scrum-manager"
REGISTRY="${REGISTRY:-}"   # Optional: set to your registry, e.g. "192.168.1.10:5000"

RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
info()  { echo -e "${GREEN}[INFO]${NC}  $*"; }
warn()  { echo -e "${YELLOW}[WARN]${NC}  $*"; }
error() { echo -e "${RED}[ERROR]${NC} $*"; exit 1; }

# ── Pre-flight checks ────────────────────────────────────────────────────────
info "Checking prerequisites..."
command -v kubectl >/dev/null 2>&1  || error "kubectl not found"
command -v docker  >/dev/null 2>&1  || error "docker not found"
kubectl cluster-info >/dev/null 2>&1 || error "Cannot reach Kubernetes cluster. Check kubeconfig."
info "Prerequisites OK."

# ── Multi-node: hostPath nodeAffinity reminder ───────────────────────────────
NODE_COUNT=$(kubectl get nodes --no-headers 2>/dev/null | wc -l)
if [ "$NODE_COUNT" -gt 1 ]; then
  warn "Multi-node cluster detected ($NODE_COUNT nodes)."
  warn "MySQL data is stored at /mnt/data/mysql on ONE node only."
  warn "Open k8s/overlays/on-premise/mysql-pv.yaml and uncomment"
  warn "the nodeAffinity block, setting it to the correct node hostname."
  warn "Run:  kubectl get nodes  to list hostnames."
  read -rp "Press ENTER to continue anyway, or Ctrl+C to abort and fix first..."
fi

# ── Build Docker images ──────────────────────────────────────────────────────
info "Building Docker images..."

BACKEND_TAG="${REGISTRY:+${REGISTRY}/}scrum-backend:latest"
FRONTEND_TAG="${REGISTRY:+${REGISTRY}/}scrum-frontend:latest"

docker build -t "$BACKEND_TAG"  -f server/Dockerfile  server/
docker build -t "$FRONTEND_TAG" -f Dockerfile         .

# ── Push or load images into cluster ────────────────────────────────────────
if [ -n "$REGISTRY" ]; then
  info "Pushing images to registry $REGISTRY..."
  docker push "$BACKEND_TAG"
  docker push "$FRONTEND_TAG"
else
  warn "No REGISTRY set. Attempting to load images via 'docker save | ssh'..."
  warn "If you have a single-node cluster and Docker runs on the same host,"
  warn "set imagePullPolicy: Never in the deployments (already set)."
  warn "For multi-node, set REGISTRY=<your-registry> before running this script."
  warn ""
  warn "  Alternatively, load images manually on each node with:"
  warn "    docker save scrum-backend:latest | ssh NODE docker load"
  warn "    docker save scrum-frontend:latest | ssh NODE docker load"
fi

# ── Apply Kubernetes manifests ────────────────────────────────────────────────
info "Applying manifests via kustomize..."
kubectl apply -k "$OVERLAY"

# ── Wait for rollout ──────────────────────────────────────────────────────────
info "Waiting for MySQL to become ready (this can take up to 90s on first run)..."
kubectl rollout status deployment/mysql -n "$NAMESPACE" --timeout=120s || \
  warn "MySQL rollout timed out — check: kubectl describe pod -l app.kubernetes.io/name=mysql -n $NAMESPACE"

info "Waiting for backend..."
kubectl rollout status deployment/backend -n "$NAMESPACE" --timeout=90s || \
  warn "Backend rollout timed out — check: kubectl logs -l app.kubernetes.io/name=backend -n $NAMESPACE"

info "Waiting for frontend..."
kubectl rollout status deployment/frontend -n "$NAMESPACE" --timeout=60s || \
  warn "Frontend rollout timed out."

# ── Show access info ──────────────────────────────────────────────────────────
echo ""
info "Deploy complete! Access the app:"

NODEPORT=$(kubectl get svc frontend -n "$NAMESPACE" -o jsonpath='{.spec.ports[0].nodePort}' 2>/dev/null || echo "")
NODE_IP=$(kubectl get nodes -o jsonpath='{.items[0].status.addresses[?(@.type=="InternalIP")].address}' 2>/dev/null || echo "<NODE-IP>")

if [ -n "$NODEPORT" ]; then
  echo ""
  echo -e "  NodePort:  ${GREEN}http://${NODE_IP}:${NODEPORT}${NC}"
fi

echo ""
echo -e "  Ingress:   ${GREEN}http://scrum.local${NC}  (add '$NODE_IP scrum.local' to /etc/hosts)"
echo ""
echo "Useful commands:"
echo "  kubectl get pods -n $NAMESPACE"
echo "  kubectl logs -f deployment/backend -n $NAMESPACE"
echo "  kubectl logs -f deployment/mysql -n $NAMESPACE"