import { isPassiveCanaryRuntime } from './server/portal-runtime-role.mjs';
import {
  healthBaselineJobIntervalMs,
  healthBaselineJobUserBatchLimit,
  isHealthBaselineJobEnabled,
} from './health-baseline-worker-config.mjs';
import {
  listHealthBaselineJobUserIds,
  runHealthBaselineJob,
} from './health-baseline-job.mjs';

export function startHealthBaselineWorker({
  healthDataRuntime = null,
  eventNotificationService = null,
  pool = null,
  env = process.env,
  logger = console,
  intervalMs = healthBaselineJobIntervalMs(env),
  userLimit = healthBaselineJobUserBatchLimit(env),
  runOnStart = false,
  setIntervalFn = setInterval,
  listUserIdsFn = listHealthBaselineJobUserIds,
  runJobFn = runHealthBaselineJob,
} = {}) {
  const observationStore = healthDataRuntime?.observationStore ?? null;
  const baselineStore = healthDataRuntime?.baselineStore ?? null;
  const eventStore = healthDataRuntime?.eventStore ?? null;

  if (
    isPassiveCanaryRuntime(env)
    || !isHealthBaselineJobEnabled(env)
    || !observationStore
    || !baselineStore
  ) {
    return { stop() {} };
  }

  let stopped = false;
  let running = false;

  const runOnce = async () => {
    if (running || stopped) return;
    running = true;
    try {
      const userIds = await listUserIdsFn({
        observationStore,
        pool,
        limit: userLimit,
      });
      if (!userIds.length) return;
      const summary = await runJobFn({
        userIds,
        observationStore,
        baselineStore,
        eventStore,
        eventNotificationService,
        env,
        logger,
      });
      if (summary.updated > 0 || summary.newEvents > 0 || summary.notificationsSent > 0) {
        logger.log?.(
          `[Health baseline job] processed=${summary.processed} updated=${summary.updated} newEvents=${summary.newEvents} notifications=${summary.notificationsSent}`,
        );
      }
    } catch (error) {
      logger.warn?.('Health baseline job worker failed:', error);
    } finally {
      running = false;
    }
  };

  if (runOnStart) {
    void runOnce();
  }

  const timer = setIntervalFn(() => {
    void runOnce();
  }, intervalMs);
  timer.unref?.();

  return {
    stop() {
      stopped = true;
      clearInterval(timer);
    },
    runOnce,
  };
}