#!/bin/bash
# Methods library for external_dns — sourced by run-*.sh and install-external_dns.sh.
# SCRIPT_DIR must be set by the caller before sourcing.

_kubectl() {
  if command -v kubectl >/dev/null 2>&1; then
    command kubectl "$@"
  elif command -v k0s >/dev/null 2>&1; then
    k0s kubectl "$@"
  else
    echo "ERROR: no kubectl or k0s binary found" >&2; exit 127
  fi
}

_resolve_kubeconfig() {
  if [ -n "${KUBECONFIG:-}" ] && [ -f "$KUBECONFIG" ]; then
    return
  fi
  for candidate in \
    /var/lib/k0s/pki/admin.conf \
    /etc/kubernetes/admin.conf \
    /root/.kube/config; do
    if [ -f "$candidate" ]; then
      export KUBECONFIG="$candidate"
      return
    fi
  done
  if command -v k0s >/dev/null 2>&1; then
    local tmp
    tmp="$(mktemp)"
    k0s kubeconfig admin > "$tmp" 2>/dev/null && export KUBECONFIG="$tmp" && return
    rm -f "$tmp"
  fi
  echo "ERROR: kubeconfig not found — set KUBECONFIG explicitly" >&2; exit 1
}

_require_env() {
  local var="$1"
  if [ -z "${!var:-}" ]; then
    echo "ERROR: required variable $var is not set" >&2; exit 1
  fi
}

_plan_apply() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  _kubectl apply -f "$path"
}

_plan_apply_skip() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  if _kubectl get -f "$path" >/dev/null 2>&1; then
    echo "  [skip] $file already exists in cluster"
    return 0
  fi
  _kubectl apply -f "$path"
}

_plan_delete() {
  local file="$1"
  local path="$SCRIPT_DIR/manifests/${file}.yaml"
  [ -f "$path" ] || { echo "  [skip] ${file}.yaml not in manifests/"; return 0; }
  _kubectl delete -f "$path" --ignore-not-found
}

_method_apply_bundle() {
  local fname="${PLAN_PARAM_FILE:-}"
  [ -n "$fname" ] || { echo "ERROR: PLAN_PARAM_FILE not set for apply_bundle" >&2; exit 1; }
  local bundle="${SCRIPT_DIR}/manifests/${fname}"
  if [ ! -f "$bundle" ]; then
    local version="${EXTERNAL_DNS_VERSION:-v0.21.0}"
    local url="https://raw.githubusercontent.com/kubernetes-sigs/external-dns/${version}/config/crd/bases/externaldns.k8s.io_dnsendpoints.yaml"
    echo "  [apply_bundle] downloading DNSEndpoint CRD ${version} from raw.githubusercontent.com"
    mkdir -p "${SCRIPT_DIR}/manifests"
    curl -fsSL "$url" -o "$bundle"
  fi
  _kubectl apply --server-side -f "$bundle"
}