const {
  by_date,
  event_date_to_date_obj,
  merge_events,
  parse_args,
  read_previous_events,
  to_unique_events,
} = require('./logic');
const { open_browser, get_page_events } = require('./browser');

const {
  events: event_file,
  get_past_events,
  get_upcoming_events,
  output,
  page_ids,
  headless,
} = parse_args(process.argv.slice(2));

(async () => {
  let events = [];
  try {
    const browser = await open_browser({ headless });
    for (let page_id of page_ids) {
      let page_events = [];
      page_events = await get_page_events(
        browser,
        page_id,
        get_upcoming_events,
        get_past_events,
      );
      events = merge_events(events, page_events);
    }
  } catch (e) {
    console.error(e);
  }

  const previous_events = await read_previous_events(event_file);

  let all_events = events
    .reduce(to_unique_events, previous_events)
    .map(event_date_to_date_obj)
    .sort(by_date);

  if (output === null) {
    console.log(JSON.stringify(all_events));
    process.exit();
  }
})();