#!/usr/bin/env bash
# delete-service: reverse new-service. gitops entry (ArgoCD prunes), namespace
# (and with it CNPG PVCs), Forgejo repo, container package versions, local clone.
#   delete-service orders-web --yes && delete-service orders --yes
set -euo pipefail
# shellcheck source=../lib/common.sh
source "$(dirname "$(readlink -f "$0")")/../lib/common.sh"

usage() {
  cat <<'EOF'
usage: delete-service NAME [--yes] [--dry-run] [--timeout SECONDS]

  --yes        don't ask for confirmation
  --dry-run    print every API call, git push and kubectl mutation instead
  --timeout    per-wait timeout (default 600)
EOF
}

NAME='' YES=0 TIMEOUT=600
while (($#)); do
  case $1 in
    --yes | -y) YES=1; shift ;;
    --dry-run) DRY_RUN=1; shift ;;
    --timeout) TIMEOUT=${2:?--timeout needs a value}; shift 2 ;;
    -h | --help) usage; exit 0 ;;
    -*) usage >&2; die "unknown option: $1" ;;
    *) [[ -z $NAME ]] || die "unexpected argument: $1"; NAME=$1; shift ;;
  esac
done
[[ -n $NAME ]] || { usage >&2; die "NAME is required"; }
validate_name "$NAME"

is_dry && log "DRY RUN: nothing below is executed except read-only checks"
load_config
gitops_sync

# ------------------------------------------------------------ what exists
NS=$(app_namespace "$NAME")
if [[ -z $NS ]]; then
  NS=$(kubectl get application -n argocd "$NAME" -o jsonpath='{.spec.destination.namespace}' 2>/dev/null || true)
fi
NS=${NS:-$NAME}
OWN_NS=0
[[ $NS == "$NAME" ]] && OWN_NS=1

# Refuse to pull a namespace out from under a frontend co-located with us.
dependents=()
for f in "$GITOPS_DIR/$APPS_DIR"/*.yaml; do
  other=$(basename "$f" .yaml)
  [[ $other != "$NAME" && $(app_namespace "$other") == "$NAME" ]] && dependents+=("$other")
done
((${#dependents[@]} == 0)) || die "${dependents[*]} deploy(s) into namespace $NAME; delete-service them first"

APP_DIR=$CODE_DIR/$NAME
cat >&2 <<EOF
This permanently deletes, for service '$NAME':
  - gitops $APPS_DIR/$NAME.yaml and manifests/$NAME/ (ArgoCD prunes the workloads)
  - $([[ $OWN_NS == 1 ]] && echo "namespace $NAME, including its Postgres data (PVCs)" || echo "nothing else in shared namespace $NS (left in place)")
  - Forgejo repo $FORGEJO_OWNER/$NAME and its container package versions
  - local clone $APP_DIR
EOF
if ((!YES)) && ! is_dry; then
  read -r -p "Type the service name to confirm: " answer
  [[ $answer == "$NAME" ]] || die "aborted"
fi

# ------------------------------------------------------------ 1. ArgoCD app + gitops
# The resources finalizer makes ArgoCD delete the app's workloads when the
# root app prunes the Application (older apps were created without it).
if kubectl get application -n argocd "$NAME" >/dev/null 2>&1; then
  run kubectl patch application -n argocd "$NAME" --type merge \
    -p '{"metadata":{"finalizers":["resources-finalizer.argocd.argoproj.io"]}}' >/dev/null
fi
paths=()
[[ -f $GITOPS_DIR/$APPS_DIR/$NAME.yaml ]] && paths+=("$APPS_DIR/$NAME.yaml")
[[ -d $GITOPS_DIR/manifests/$NAME ]] && paths+=("manifests/$NAME")
if ((${#paths[@]})); then
  if is_dry; then
    dry "git -C $GITOPS_DIR rm -r ${paths[*]}"
  else
    git -C "$GITOPS_DIR" rm -rq -- "${paths[@]}"
  fi
  gitops_commit_push "chore($NAME): delete service" "${paths[@]}"
  argocd_refresh root
else
  ok "gitops has no entry for $NAME"
fi

if ! is_dry; then
  app_gone() { ! kubectl get application -n argocd "$NAME" >/dev/null 2>&1; }
  if ! app_gone; then
    # If root never managed it (e.g. scaffold stopped before registering), delete directly.
    sleep 15
    app_gone || kubectl get application -n argocd root -o json |
      jq -e --arg n "$NAME" '.status.resources[]? | select(.kind == "Application" and .name == $n)' >/dev/null ||
      kubectl delete application -n argocd "$NAME" --wait=false >/dev/null
    wait_until "$TIMEOUT" 5 "ArgoCD to prune application $NAME and its resources" app_gone
  else
    ok "no ArgoCD application $NAME"
  fi
fi

# ------------------------------------------------------------ 1b. public DNS
cf_cname_delete "$NAME"

# ------------------------------------------------------------ 2. namespace
if ((OWN_NS)); then
  if kubectl get namespace "$NAME" >/dev/null 2>&1; then
    run kubectl delete namespace "$NAME" --wait=false >/dev/null
    if ! is_dry; then
      ns_gone() { ! kubectl get namespace "$NAME" >/dev/null 2>&1; }
      wait_until "$TIMEOUT" 5 "namespace $NAME to terminate" ns_gone
    fi
  else
    ok "namespace $NAME absent"
  fi
fi

# ------------------------------------------------------------ 3. container package
# The admin token has no package scope; the registry push token (same user) does.
deleted=0
while :; do
  api GET "/packages/$FORGEJO_OWNER?type=container&q=$NAME&limit=50" '' registry
  [[ $API_CODE == 200 ]] || die "listing packages failed ($API_CODE): $API_BODY"
  mapfile -t versions < <(jq -r --arg n "$NAME" '.[] | select(.name == $n) | .version' <<<"$API_BODY")
  ((${#versions[@]})) || break
  for v in "${versions[@]}"; do
    api_write DELETE "/packages/$FORGEJO_OWNER/container/$NAME/$(jq -rn --arg v "$v" '$v | @uri')" '' registry
    [[ $API_CODE =~ ^20[04]$ || $API_CODE == 404 ]] || die "delete package $NAME/$v failed ($API_CODE): $API_BODY"
    deleted=$((deleted + 1))
  done
  is_dry && break
done
ok "container package $NAME: $deleted version(s) deleted"

# ------------------------------------------------------------ 4. repo
if repo_exists "$NAME"; then
  [[ $(jq -r .template <<<"$API_BODY") != true ]] || die "refusing to delete template repo $NAME"
  api_write DELETE "/repos/$FORGEJO_OWNER/$NAME"
  [[ $API_CODE == 204 || $API_CODE == 200 ]] || die "delete repo failed ($API_CODE): $API_BODY"
  ok "repo $FORGEJO_OWNER/$NAME deleted"
else
  ok "repo $FORGEJO_OWNER/$NAME absent"
fi

# ------------------------------------------------------------ 5. local clone
if [[ -d $APP_DIR ]]; then
  origin=$(git -C "$APP_DIR" remote get-url origin 2>/dev/null || true)
  [[ $origin == "$FORGEJO_URL/$FORGEJO_OWNER/$NAME.git" ]] ||
    die "$APP_DIR origin is '$origin', not this service's repo; not deleting it"
  run rm -rf -- "$APP_DIR"
  ok "removed $APP_DIR"
fi

ok "$NAME deleted in $(elapsed)s"