#!/bin/bash
# ==========================================
# pause-app.sh — Shuts down the AKS cluster, preserves the disk and data
#
# What this script does:
#   1. Deletes Kubernetes objects (pods removed cleanly)
#   2. Stops the entire AKS cluster  →  all VMs deallocated  →  compute billing ~$0
#   3. The PVC disk remains intact  →  data is preserved
#   4. ACR continues to exist (small cost: ~$5/month)
#
# Cost during pause: ~$25/month (disk + ACR + public IP + LB)
# vs. ~$183/month when fully running
# ==========================================
set -euo pipefail

# ==========================================
# LOGGER — source the shared library
# ==========================================
# shellcheck source=lib/logger.sh
source "$(dirname "$0")/lib/logger.sh" "pause"
trap 'log_error "Failure at line $LINENO. See $LOG_FILE"' ERR

RESOURCE_GROUP="ExamApp-RG"
AKS_NAME="ExamApp-AKS"

log_info "========================================"
log_info "  Vigimeteo – Pause (cost saving)"
log_info "  Log: $LOG_FILE"
log_info "========================================"

# Step 1: Remove Kubernetes objects (cleanly releases resources)
if kubectl get namespace vigimeteo &>/dev/null; then
  log_info "Deleting namespace vigimeteo..."
  kubectl delete namespace vigimeteo
  log_info "Namespace deleted."
else
  log_warn "Namespace vigimeteo already absent."
fi

# Step 2: Stop the AKS cluster (deallocates all VMs — works on system node pools)
# az aks stop is preferred over nodepool scale --node-count 0 because system node
# pools cannot be scaled below minCount:1 and would return InvalidParameter.
log_info "Stopping AKS cluster '$AKS_NAME' (deallocating all VMs)..."
az aks stop \
  --resource-group "$RESOURCE_GROUP" \
  --name "$AKS_NAME"
log_info "AKS cluster stopped — all VMs deallocated."

log_info "========================================"
log_info "App paused."
log_info "PostgreSQL disk (PVC) is preserved."
log_info "Estimated cost: ~25 USD/month (disk + ACR + IP)"
log_info "To resume: ./resume-app.sh"
log_info "========================================"