/*
 * Copyright (C) 2018 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {Bulk} from '@openstapps/api/lib/bulk';
import {ConnectorClient as Client} from '@openstapps/api/lib/connectorClient';
import {HttpClient} from '@openstapps/api/lib/httpClient';
import {SCBulkAddResponse, SCMessage} from '@openstapps/core';
import {Logger} from '@openstapps/logger';
import * as promiseLimit from 'promise-limit';
import {MinimalConnector} from '.';

const api = new Client(new HttpClient(), 'http://localhost:3000');
const logger = new Logger();

async function runConnector() {

  const connector = new MinimalConnector();
  const items = await connector.getItems();

  if (items.length === 0) {
    throw new Error('No items fetched.');
  }

  let bulk: Bulk<SCMessage>;

  try {
    bulk = await api.bulk<SCMessage>('message', 'minimal-connector');
  } catch (err) {
    logger.error('Couldn\'t open bulk.');
    throw err;
  }

  // create a concurrency limit
  const limit = promiseLimit<SCBulkAddResponse>(5);

  try {
    // index all items with our concurrency limit
    await Promise.all(items.map((item) => {
      return limit(() => bulk.add(item));
    }));
  } catch (err) {
    logger.error('Error while indexing items.');
    throw err;
  }

  try {
    await bulk.done();
  } catch (err) {
    logger.error('Error while closing bulk');
    throw err;
  }
}

runConnector().then(() => {
  logger.log('Done.');
}, (err) => {
  throw err;
});