#!/usr/bin/env bash
# autoscaler/vertical-pod-autoscaler 0.9.0 - base variant: default
# Path: fetch this entry's retained objects, check their SHA-256, then apply
# them with kubectl. It uses curl, shasum, awk and kubectl. It needs no cub
# CLI and no ConfigHub account.
# Generated by scripts/generate-public-site.mjs from this entry's listing:
# https://confighub.github.io/helm-expt/site/listings/autoscaler-vertical-pod-autoscaler-0-9-0-default.json
# Entry page: https://confighub.github.io/helm-expt/site/charts/autoscaler-vertical-pod-autoscaler-0-9-0.html
set -euo pipefail

say() { printf '\n>> %s\n' "$*"; }

for tool in curl awk kubectl; do
  if ! command -v "$tool" >/dev/null 2>&1; then
    printf '%s is required and was not found.\n' "$tool" >&2
    exit 1
  fi
done
if command -v shasum >/dev/null 2>&1; then
  sha256_of() { shasum -a 256 "$1" | awk '{print $1}'; }
elif command -v sha256sum >/dev/null 2>&1; then
  sha256_of() { sha256sum "$1" | awk '{print $1}'; }
else
  printf 'shasum is required and was not found.\n' >&2
  exit 1
fi

work=./autoscaler-vertical-pod-autoscaler-0-9-0-default-objects
objects_url=https://raw.githubusercontent.com/confighub/helm-expt/main/recipes/autoscaler/vertical-pod-autoscaler/0.9.0/revisions/default/r001/rendered/release-objects.yaml
objects_sha256=9d7307f629bdc478fa0c9bc6646359976b96d0cfd549bd66c13442facfa57490

say "Fetch the retained objects into $work/objects.yaml"
mkdir -p "$work"
curl -fsSL -o "$work/objects.yaml" "$objects_url"

say "Check the file against the SHA-256 in the listing"
fetched_sha256="$(sha256_of "$work/objects.yaml")"
if [ "$fetched_sha256" != "$objects_sha256" ]; then
  printf 'The file differs from the listing, so the script stops. Nothing was applied.\n  listing: %s\n  fetched: %s\n' "$objects_sha256" "$fetched_sha256" >&2
  exit 1
fi
printf 'The file matches: sha256 %s\n' "$fetched_sha256"

say "Split the file into its 39 objects. The cluster is untouched so far"
rm -rf "$work/docs" "$work/crds" "$work/rest"
mkdir -p "$work/docs" "$work/crds" "$work/rest"
awk -v dir="$work/docs" 'BEGIN { n = 0; f = sprintf("%s/doc-%04d.yaml", dir, n) } /^---[ \t]*$/ { close(f); n++; f = sprintf("%s/doc-%04d.yaml", dir, n); next } { print > f }' "$work/objects.yaml"
for n in 0002 0003; do mv "$work/docs/doc-$n.yaml" "$work/crds/"; done
for n in 0004 0005 0006 0007 0008 0009 0010 0011 0012 0013 0014 0015; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0016 0017 0018 0019 0020 0021 0022 0023 0024 0025 0026 0027; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0028 0029 0030 0031 0032 0033 0034 0035 0036 0037 0038 0039; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
for n in 0040; do mv "$work/docs/doc-$n.yaml" "$work/rest/"; done
ls "$work/crds" "$work/rest"

if [ "${REQUIREMENTS_READY:-0}" != "1" ]; then
  say "Stop before applying anything. This entry's plan has 1 step that an install needs first"
  cat >&2 <<'EOF_REQUIREMENTS'
This script cannot carry out this step of the plan. It is yours to do, with your own values:
  - Secret default/vpa-tls-certs must exist before apply. Webhook serving certificate Secret mounted by the VPA admission controller; Helm normally creates this via the certgen hook.
Nothing was applied. Complete it before you apply the objects.
When it is done, re-run with:
  REQUIREMENTS_READY=1 bash try-objects.sh
EOF_REQUIREMENTS
  exit 1
fi
say "REQUIREMENTS_READY=1 is set. The script takes your word for 1 step and does not check it"

say "Check that kubectl reaches a cluster"
if ! kubectl get --raw /version >/dev/null 2>&1; then
  printf 'kubectl cannot reach a cluster. Point it at a throwaway cluster and re-run this script.\n' >&2
  exit 1
fi
kubectl config current-context 2>/dev/null || true

say "Create the default namespace if it does not exist"
if ! kubectl get namespace default >/dev/null 2>&1; then
  kubectl create namespace default
fi

wait_for_crd() {
  crd_name="$1"
  deadline=$(( $(date +%s) + 180 ))
  until kubectl get "crd/${crd_name}" >/dev/null 2>&1; do
    if [ "$(date +%s)" -ge "$deadline" ]; then
      printf "CRD %s did not appear within 180 seconds.\n" "$crd_name" >&2
      return 1
    fi
    sleep 2
  done
  kubectl wait --for=condition=Established --timeout=120s "crd/${crd_name}"
}

say "Check the 2 CRDs this file holds"
missing_crds=0
if ! kubectl get crd/verticalpodautoscalercheckpoints.autoscaling.k8s.io >/dev/null 2>&1; then
  missing_crds=1
fi
if ! kubectl get crd/verticalpodautoscalers.autoscaling.k8s.io >/dev/null 2>&1; then
  missing_crds=1
fi
if [ "$missing_crds" -eq 1 ]; then
  say "A CRD is missing, so apply the file's CRDs first"
  kubectl apply --server-side -f "$work/crds"
  crd_outcome="were applied first"
elif kubectl diff --server-side -f "$work/crds" >/dev/null 2>&1; then
  say "The CRDs already exist and match this file. The script leaves them under their current owner"
  crd_outcome="already existed and matched, so the script left them alone"
elif [ "${APPLY_CRDS:-0}" = "1" ]; then
  say "The existing CRDs differ from this file. APPLY_CRDS=1 is set, so the script applies the file's CRDs"
  kubectl apply --server-side -f "$work/crds"
  crd_outcome="differed and were applied, because APPLY_CRDS=1 was set"
else
  say "The CRDs already exist and differ from this file, or another tool owns them"
  cat <<'EOF_CRDS'
This script does not change CRDs it did not just create.
If this is an upgrade, the objects that follow may need the newer CRDs.
To let this script apply the file's CRDs, re-run with:
  APPLY_CRDS=1 bash try-objects.sh
EOF_CRDS
  exit 1
fi
wait_for_crd verticalpodautoscalercheckpoints.autoscaling.k8s.io
wait_for_crd verticalpodautoscalers.autoscaling.k8s.io

say "Apply the other 37 objects"
kubectl apply -f "$work/rest"

say "Done. The 2 CRDs $crd_outcome. kubectl applied the other 37 objects of this entry's retained file."
say "The script stops here. It did not wait for any workload to start"
say "Not run by this script: 1 step of this entry's plan. The entry page says who runs it."
cat <<'EOF_NOT_RUN'
   - Secret default/vpa-tls-certs must exist before apply. Webhook serving certificate Secret mounted by the VPA admission controller; Helm normally creates this via the certgen hook.
EOF_NOT_RUN