/* eslint-disable import/no-absolute-path */

// Wiring only: what the union actually does lives in subsUnionLogic.js, where it
// can be tested without booting a server (see test/server/subsUnion.test.js).

import { Meteor } from 'meteor/meteor';
import Subscriptions from '/imports/api/Subscriptions/Subscriptions';
import SiteSettings from '/imports/api/SiteSettings/SiteSettings';
import calcUnionAsync from '/imports/startup/server/calcUnionAsync';
import unionBounds from '/imports/startup/server/unionBounds';
import createSubsUnion from '/imports/startup/server/subsUnionLogic';
import unionTelemetry from '/imports/startup/server/unionTelemetry';
import { isMailServerMaster } from '/imports/startup/server/email';

Meteor.startup(async () => {
  if (!isMailServerMaster) {
    console.log('We only process subsUnion in master');
    return;
  }

  const subsUnion = createSubsUnion({
    calcUnion: calcUnionAsync,
    SiteSettings,
    Subscriptions,
    boundsOf: unionBounds,
    telemetry: unionTelemetry
  });

  if (await subsUnion.isUnionOutdated()) {
    console.log('Subs union outdated');
    subsUnion.scheduleRecreate();
  } else {
    console.log('Subs union up-to-date');
  }

  await Subscriptions.find({ createdAt: { $gt: new Date() } }).observeAsync({
    added: function newSubAdded(doc) {
      console.log('Subs added, merging into union incrementally');
      subsUnion.enqueueAdd(doc);
    }
  });

  await Subscriptions.find().observeAsync({
    changed: function subsChanged() {
      console.log('Subs changed so recreate union');
      subsUnion.scheduleRecreate();
    },
    removed: function subsRemoved() {
      console.log('Subs removed so recreate union');
      subsUnion.scheduleRecreate();
    }
  });
});