const MONTHS = [
  'Jan',
  'Feb',
  'Mar',
  'Apr',
  'May',
  'Jun',
  'Jul',
  'Aug',
  'Sep',
  'Oct',
  'Nov',
  'Dec',
];

const pad = (n: number) => {
  return n < 10 ? '0' + n : n;
};

const timeConvert24hTo12h = (value: string) => {
  let time: any[] = value
    .toString()
    .match(/^([01]\d|2[0-3])(:)([0-5]\d)?$/) || [value];

  if (time.length > 1) {
    time = time.slice(1);
    time[3] = +time[0] < 12 ? 'AM' : 'PM';
    time[0] = +time[0] % 12 || 12;
  }
  return time.join('');
};

/**
 * "JSC" compiler in Android doesn't not support ISO dateTime format in the form of "2022-05-26T07:32:50+0000"
 * Although this format works in "hermes" js engine. Below Regex helps us to fix the unsupported date time format by
 * converting it to "2022-05-26T07:32:50+00:00"
 */
const ANDROID_UNSUPPORTED_DATE_TIME_REGEX_FORMAT = new RegExp(
  /[\d\-:T]+\+\d{4}$/
);

export const convertDateTime = (date: string) => {
  let dateTimeObj = new Date(date);

  if (!dateTimeObj.getDate()) {
    if (ANDROID_UNSUPPORTED_DATE_TIME_REGEX_FORMAT.test(date)) {
      dateTimeObj = new Date(
        `${date.slice(0, date.length - 2)}:${date.slice(-2)}`
      );
    } else {
      // In ideal case, this is Unreachable path but keeping convertDateTime util fn less strict
      return '';
    }
  }

  const formattedDate = `${dateTimeObj.getDate()} ${
    MONTHS[dateTimeObj.getMonth()]
  } ${dateTimeObj.getFullYear()}`;

  const formattedTime = timeConvert24hTo12h(
    `${pad(dateTimeObj.getHours())}:${pad(dateTimeObj.getMinutes())}`
  );

  return `${formattedDate} ${formattedTime}`;
};