// TODO: could probably be a dynamic import
import intl from 'intl';
import 'intl/locale-data/jsonp/en.js';

if (!window.Intl) {
  // No `Intl`, so use and load the polyfill.
  window.Intl = intl;
}

import { EventInput, Calendar, CalendarOptions } from '@fullcalendar/core';
import iCalendarPlugin from '@fullcalendar/icalendar';
import resourceTimeGridPlugin from '@fullcalendar/resource-timegrid';

import { unique_colors } from 'unique-colors';

import './index.html';
import './index.css';

const calendars: { [key: string]: string } = {
  computer_lab: '6mmjp85e4732ru6skf1dda54ls@group.calendar.google.com',
  electronics: '1g8atbdschshrg2inf162rcqt4@group.calendar.google.com',
  wood_shop: '4unv3ia1n9mc9u31n2n5lv8nd8@group.calendar.google.com',
  fiber_arts_studio: '7gbndciog37ge0hd8ug33ml70k@group.calendar.google.com',
  jewelry_studio: 'l0dl2jq3vhbi9f4lfmaf5negc0@group.calendar.google.com',
  metal_shop: 'a4p97kiiafatqdr52c3a0cpre0@group.calendar.google.com',
  room_reservations: 'f4ro53uklj2u6pr0se7ucskm6g@group.calendar.google.com',
};

const colors: string[] = unique_colors(Object.keys(calendars).length);

const urlParams = new URLSearchParams(window.location.search);
const toolFilter: string[] | undefined = urlParams.get('tool')?.split(';');

function eventDataTransform(eventData: EventInput): EventInput {
  // clear the url to prevent clicking on the event
  delete eventData.url;

  const match = eventData?.title?.match(/([^\/]*) \| ([^-]*) - (.*)/);
  if (match) {
    const [, member, shop, tool] = match;
    eventData.title = `${member}`;
    eventData.resourceId = tool;
    if (!toolFilter) {
      calendar.addResource({ id: tool, title: tool }, false);
    }
  }
  return eventData;
}

const calendarOptions: CalendarOptions = {
  schedulerLicenseKey: 'CC-Attribution-NonCommercial-NoDerivatives',
  plugins: [iCalendarPlugin, resourceTimeGridPlugin],
  allDaySlot: false,
  nowIndicator: true,
  headerToolbar: { start: '', center: 'title', end: '' },
  initialView: 'resourceTimeGrid',
  height: 'auto',
  slotMinTime: '8:00',
  slotMaxTime: '22:00',
  businessHours: {
    daysOfWeek: [0, 1, 2, 3, 4, 5, 6],
    startTime: '10:00',
    endTime: '21:00',
  },
  eventSources: Object.values(calendars).map((id, idx) => {
    return {
      url: '/calendar/ical/' + id + '/public/basic.ics',
      format: 'ics',
      color: colors[idx],
      eventDataTransform: eventDataTransform,
    };
  }),
  slotLabelFormat: {
    hour: 'numeric',
    minute: '2-digit',
    hour12: false,
  },
  eventTimeFormat: {
    hour: 'numeric',
    minute: '2-digit',
    hour12: false,
  },
  resources: toolFilter
    ? toolFilter.map((tool) => {
        return {
          id: tool,
          title: tool,
        };
      })
    : [],
};

const calendarEl = document.getElementById('calendar');
const calendar = new Calendar(calendarEl!, calendarOptions);

calendar.render();

function refresh() {
  calendar.refetchEvents();
  calendar.today();
}

// refresh data every five minutes
window.setInterval(refresh, 5 * 60 * 1000);