import { differenceInCalendarDays, formatDistanceToNow } from 'date-fns';
import { DateTime } from 'luxon';

import { logError } from './logError';

export const DEFAULT_DATE_LOCALE = 'en-EN';

export function parseDate(dateToParse: Date | string | number) {
  let formattedDate: DateTime | null = null;

  if (!dateToParse) {
    throw new Error(`Invalid date passed to formatPastDate: "${dateToParse}"`);
  } else if (typeof dateToParse === 'string') {
    formattedDate = DateTime.fromISO(dateToParse);
  } else if (dateToParse instanceof Date) {
    formattedDate = DateTime.fromJSDate(dateToParse);
  } else if (typeof dateToParse === 'number') {
    formattedDate = DateTime.fromMillis(dateToParse);
  }

  if (!formattedDate) {
    throw new Error(`Invalid date passed to formatPastDate: "${dateToParse}"`);
  }

  if (!formattedDate.isValid) {
    throw new Error(`Invalid date passed to formatPastDate: "${dateToParse}"`);
  }

  return formattedDate.setLocale(DEFAULT_DATE_LOCALE);
}

function isSameDay(a: DateTime, b: DateTime): boolean {
  return a.hasSame(b, 'day') && a.hasSame(b, 'month') && a.hasSame(b, 'year');
}

function formatDate(dateToFormat: Date | string | number, format: string) {
  try {
    const parsedDate = parseDate(dateToFormat);
    return parsedDate.toFormat(format);
  } catch (error) {
    logError(error);
    return '';
  }
}

export function beautifyExactDateTime(dateToBeautify: Date | string | number) {
  const isToday = isSameDay(parseDate(dateToBeautify), DateTime.local());
  const dateFormat = isToday ? 'T' : 'DD · T';
  return formatDate(dateToBeautify, dateFormat);
}

export function beautifyExactDate(dateToBeautify: Date | string | number) {
  const isToday = isSameDay(parseDate(dateToBeautify), DateTime.local());
  const dateFormat = isToday ? "'Today'" : 'DD';
  return formatDate(dateToBeautify, dateFormat);
}

export function beautifyPastDateRelativeToNow(
  pastDate: Date | string | number,
) {
  try {
    const parsedDate = parseDate(pastDate);

    return formatDistanceToNow(parsedDate.toJSDate(), {
      addSuffix: true,
    }).replace('less than a minute ago', 'now');
  } catch (error) {
    logError(error);
    return '';
  }
}

export function beautifyPastDateAbsolute(pastDate: Date | string | number) {
  try {
    const parsedPastDate = parseDate(pastDate);

    const hoursDiff = parsedPastDate.diffNow('hours').negate().hours;

    if (hoursDiff <= 24) {
      return parsedPastDate.toFormat('HH:mm');
    } else if (hoursDiff <= 7 * 24) {
      return parsedPastDate.toFormat('cccc - HH:mm');
    } else if (hoursDiff <= 365 * 24) {
      return parsedPastDate.toFormat('MMMM d - HH:mm');
    } else {
      return parsedPastDate.toFormat('dd/MM/yyyy - HH:mm');
    }
  } catch (error) {
    logError(error);
    return '';
  }
}

export function hasDatePassed(date: Date | string | number) {
  try {
    const parsedDate = parseDate(date);

    return (
      differenceInCalendarDays(
        DateTime.local().toJSDate(),
        parsedDate.toJSDate(),
      ) >= 1
    );
  } catch (error) {
    logError(error);
    return false;
  }
}