const cron = require('node-cron');

const { FEATURE_FLAG_KEYS, evaluateFeatureFlag } = require('../services/featureFlags');
const { syncErpMasterData } = require('../services/integrations/erpMasterData');

async function runErpMasterDataSyncOnce(prisma, config, logger) {
  if (!config.erpMasterDataSyncCron) {
    return {
      skipped: true,
      reason: 'cron_disabled',
      items: [],
    };
  }

  const gate = await evaluateFeatureFlag({
    prisma,
    config,
    flagKey: FEATURE_FLAG_KEYS.erpSync,
    departmentId: null,
    strictDepartment: false,
  });

  if (!gate.enabled) {
    logger.info(
      {
        featureFlag: FEATURE_FLAG_KEYS.erpSync,
        reason: gate.reason,
      },
      'ERP master data sync skipped by ERP gate',
    );
    return {
      skipped: true,
      reason: gate.reason,
      items: [],
    };
  }

  return syncErpMasterData(prisma, config, { logger });
}

function startErpMasterDataSyncJob(fastify) {
  if (!fastify.config.erpMasterDataSyncCron) {
    fastify.log.info('ERP master data sync cron disabled');
    return null;
  }

  let running = false;
  const task = cron.schedule(fastify.config.erpMasterDataSyncCron, async () => {
    if (running) {
      return;
    }

    running = true;
    try {
      await runErpMasterDataSyncOnce(fastify.prisma, fastify.config, fastify.log);
      fastify.metrics?.jobRunsTotal?.inc?.({
        job: 'erp.master-data.sync',
        driver: 'cron',
        outcome: 'success',
      });
    } catch (error) {
      fastify.log.error({ err: error }, 'ERP master data sync job failed');
      fastify.metrics?.jobRunsTotal?.inc?.({
        job: 'erp.master-data.sync',
        driver: 'cron',
        outcome: 'failure',
      });
    } finally {
      running = false;
    }
  });

  fastify.addHook('onClose', async () => {
    task.stop();
    task.destroy();
  });

  fastify.log.info(
    {
      cron: fastify.config.erpMasterDataSyncCron,
    },
    'ERP master data sync job scheduled',
  );

  return task;
}

module.exports = {
  runErpMasterDataSyncOnce,
  startErpMasterDataSyncJob,
};