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

ROOT_DIR="${1:-/opt/domaincheck}"
ENV_FILE="/etc/default/domaincheck-node-agent"
SERVICE_FILE="/etc/systemd/system/domaincheck-node-agent.service"
SERVICE_NAME="domaincheck-node-agent"

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

resolve_project_root() {
  local candidate
  for candidate in \
    "${ROOT_DIR}/domainCheck" \
    "${ROOT_DIR}/domain-api" \
    "${ROOT_DIR}" \
    "$(cd "${SCRIPT_DIR}/../.." && pwd)"; do
    if [[ -f "${candidate}/deploy/systemd/domain-node-agent.service" && -f "${candidate}/deploy/multi-region/templates/domaincheck-node-agent.env.example" ]]; then
      printf '%s' "${candidate}"
      return 0
    fi
  done
  return 1
}

PROJECT_ROOT="$(resolve_project_root || true)"
if [[ -z "${PROJECT_ROOT}" ]]; then
  echo "unable to resolve project root under ${ROOT_DIR} or ${SCRIPT_DIR}" >&2
  exit 1
fi

TEMPLATE_FILE="${PROJECT_ROOT}/deploy/multi-region/templates/domaincheck-node-agent.env.example"
UNIT_TEMPLATE="${PROJECT_ROOT}/deploy/systemd/domain-node-agent.service"

echo "[1/5] install systemd unit"
install -m 0644 "${UNIT_TEMPLATE}" "${SERVICE_FILE}"

echo "[2/5] install env template if absent"
if [[ ! -f "${ENV_FILE}" ]]; then
  install -m 0644 "${TEMPLATE_FILE}" "${ENV_FILE}"
  echo "created ${ENV_FILE}"
else
  echo "keep existing ${ENV_FILE}"
fi

echo "[3/5] reload systemd"
systemctl daemon-reload

echo "[4/5] enable service"
systemctl enable "${SERVICE_NAME}" >/dev/null

echo "[5/5] next steps"
echo "project_root=${PROJECT_ROOT}"
echo "edit ${ENV_FILE} and set:"
echo "  OPS_CONTROL_PLANE_BASE_URL"
echo "  OPS_AGENT_TOKEN"
echo "  NODE_CODE / NODE_REGION / NODE_ROLE"
echo
echo "then run:"
echo "  systemctl restart ${SERVICE_NAME}"
echo "  systemctl status ${SERVICE_NAME} --no-pager -l"