#!/bin/bash
# Tier-1 dispatch for vector component operations.
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

[ -f "${SCRIPT_DIR}/env-vector" ] && source "${SCRIPT_DIR}/env-vector"

VECTOR_NAME="${VECTOR_NAME:-vector}"
VECTOR_NAMESPACE="${VECTOR_NAMESPACE:-observability}"
VECTOR_PORT="${VECTOR_PORT:-8686}"

CMD_TSK="${CMD_TSK:-${1:-install}}"

source "${SCRIPT_DIR}/vector-lib.sh"

_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
  echo "ERROR: kubeconfig not found — set KUBECONFIG explicitly" >&2; exit 1
}

_do_install() {
  for manifest in namespace.yaml serviceaccount.yaml clusterrole.yaml clusterrolebinding.yaml \
                  configmap.yaml daemonset.yaml service.yaml; do
    local path="$SCRIPT_DIR/manifests/${manifest}"
    [ -f "$path" ] && _kubectl apply -f "$path"
  done
  echo "Waiting for ${VECTOR_NAME} DaemonSet to be ready..."
  _wait_for_pod 180
  echo "${VECTOR_NAME} installed in namespace ${VECTOR_NAMESPACE}"
}

_do_update() {
  for manifest in configmap.yaml daemonset.yaml; do
    local path="$SCRIPT_DIR/manifests/${manifest}"
    [ -f "$path" ] && _kubectl apply -f "$path"
  done
  _kubectl rollout restart "daemonset/${VECTOR_NAME}" --namespace "$VECTOR_NAMESPACE"
  _wait_for_pod 180
  echo "${VECTOR_NAME} updated"
}

_do_delete() {
  for manifest in daemonset.yaml service.yaml clusterrolebinding.yaml clusterrole.yaml serviceaccount.yaml; do
    local path="$SCRIPT_DIR/manifests/${manifest}"
    [ -f "$path" ] && _kubectl delete -f "$path" --ignore-not-found
  done
  echo "${VECTOR_NAME} deleted from namespace ${VECTOR_NAMESPACE}"
}

_do_restart() {
  _kubectl rollout restart "daemonset/${VECTOR_NAME}" --namespace "$VECTOR_NAMESPACE"
  _wait_for_pod 180
  echo "${VECTOR_NAME} restarted"
}

_do_health() {
  local ready
  ready=$(_kubectl get daemonset "${VECTOR_NAME}" \
    --namespace "$VECTOR_NAMESPACE" \
    -o jsonpath='{.status.numberReady}' 2>/dev/null || echo "0")
  local desired
  desired=$(_kubectl get daemonset "${VECTOR_NAME}" \
    --namespace "$VECTOR_NAMESPACE" \
    -o jsonpath='{.status.desiredNumberScheduled}' 2>/dev/null || echo "-1")
  if [ "$ready" -eq "$desired" ] && [ "$desired" -gt 0 ]; then
    echo "HEALTHY: ${VECTOR_NAME} ${ready}/${desired} pods ready"
  else
    echo "UNHEALTHY: ${VECTOR_NAME} ${ready}/${desired} pods ready" >&2; exit 1
  fi
}

_resolve_kubeconfig

case "$CMD_TSK" in
  install)  [ -f "$SCRIPT_DIR/run-init.sh" ]    && exec bash "$SCRIPT_DIR/run-init.sh";    _do_install  ;;
  update)   [ -f "$SCRIPT_DIR/run-update.sh" ]  && exec bash "$SCRIPT_DIR/run-update.sh";  _do_update   ;;
  delete)   [ -f "$SCRIPT_DIR/run-delete.sh" ]  && exec bash "$SCRIPT_DIR/run-delete.sh";  _do_delete   ;;
  restart)  [ -f "$SCRIPT_DIR/run-restart.sh" ] && exec bash "$SCRIPT_DIR/run-restart.sh"; _do_restart  ;;
  health)   _do_health ;;
  *)        echo "ERROR: unknown CMD_TSK='${CMD_TSK}'. Valid: install|update|delete|restart|health" >&2; exit 1 ;;
esac