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

usage() {
  cat <<'USAGE'
Run a service smoke test from a persistent pod, then exec curl inside it.

Usage:
  NAMESPACE=<namespace> tools/smoke-service.sh http://service.namespace.svc/path

Optional environment:
  POD_NAME     Reusable smoke pod name (default: service-smoke)
  SMOKE_IMAGE  Image with curl installed (default: curlimages/curl:8.10.1)
  CLEANUP      Delete the smoke pod after the test (default: false)
USAGE
}

if [[ "${1:-}" == "-h" || "${1:-}" == "--help" || $# -ne 1 ]]; then
  usage
  exit 0
fi

target_url="$1"
NAMESPACE="${NAMESPACE:-default}"
POD_NAME="${POD_NAME:-service-smoke}"
SMOKE_IMAGE="${SMOKE_IMAGE:-curlimages/curl:8.10.1}"
CLEANUP="${CLEANUP:-false}"

if ! command -v kubectl >/dev/null 2>&1; then
  echo "ERROR: missing required command: kubectl" >&2
  exit 1
fi

if ! kubectl get pod "$POD_NAME" -n "$NAMESPACE" >/dev/null 2>&1; then
  kubectl run "$POD_NAME" \
    -n "$NAMESPACE" \
    --image="$SMOKE_IMAGE" \
    --restart=Never \
    --command -- sleep 3600
fi

kubectl wait -n "$NAMESPACE" --for=condition=Ready "pod/$POD_NAME" --timeout=90s
kubectl exec -n "$NAMESPACE" "$POD_NAME" -- curl -fsS "$target_url"

if [[ "$CLEANUP" == "true" ]]; then
  kubectl delete pod "$POD_NAME" -n "$NAMESPACE" --wait=false
fi