/* eslint-disable eslint-comments/no-unlimited-disable */
/* eslint-disable */
// @ts-nocheck

import { addLeadingZeros } from '../_lib/addLeadingZeros/index.ts';
import { toDate } from '../toDate/index.ts';
import type { ContextOptions, DateArg, ISOFormatOptions } from '../types.ts';

/**
 * The {@link formatISO} function options.
 */
export interface FormatISOOptions extends ISOFormatOptions, ContextOptions<Date> {}

/**
 * @name formatISO
 * @category Common Helpers
 * @summary Format the date according to the ISO 8601 standard (https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a003169814.htm).
 *
 * @description
 * Return the formatted date string in ISO 8601 format. Options may be passed to control the parts and notations of the date.
 *
 * @param date - The original date
 * @param options - An object with options.
 *
 * @returns The formatted date string (in local time zone)
 *
 * @throws `date` must not be Invalid Date
 *
 * @example
 * // Represent 18 September 2019 in ISO 8601 format (local time zone is UTC):
 * const result = formatISO(new Date(2019, 8, 18, 19, 0, 52))
 * //=> '2019-09-18T19:00:52Z'
 *
 * @example
 * // Represent 18 September 2019 in ISO 8601, short format (local time zone is UTC):
 * const result = formatISO(new Date(2019, 8, 18, 19, 0, 52), { format: 'basic' })
 * //=> '20190918T190052'
 *
 * @example
 * // Represent 18 September 2019 in ISO 8601 format, date only:
 * const result = formatISO(new Date(2019, 8, 18, 19, 0, 52), { representation: 'date' })
 * //=> '2019-09-18'
 *
 * @example
 * // Represent 18 September 2019 in ISO 8601 format, time only (local time zone is UTC):
 * const result = formatISO(new Date(2019, 8, 18, 19, 0, 52), { representation: 'time' })
 * //=> '19:00:52Z'
 */
export function formatISO(date: DateArg<Date> & {}, options?: FormatISOOptions): string {
  const date_ = toDate(date, options?.in);

  if (isNaN(+date_)) {
    throw new RangeError('Invalid time value');
  }

  const format = options?.format ?? 'extended';
  const representation = options?.representation ?? 'complete';

  let result = '';
  let tzOffset = '';

  const dateDelimiter = format === 'extended' ? '-' : '';
  const timeDelimiter = format === 'extended' ? ':' : '';

  // Representation is either 'date' or 'complete'
  if (representation !== 'time') {
    const day = addLeadingZeros(date_.getDate(), 2);
    const month = addLeadingZeros(date_.getMonth() + 1, 2);
    const year = addLeadingZeros(date_.getFullYear(), 4);

    // yyyyMMdd or yyyy-MM-dd.
    result = `${year}${dateDelimiter}${month}${dateDelimiter}${day}`;
  }

  // Representation is either 'time' or 'complete'
  if (representation !== 'date') {
    // Add the timezone.
    const offset = date_.getTimezoneOffset();

    if (offset !== 0) {
      const absoluteOffset = Math.abs(offset);
      const hourOffset = addLeadingZeros(Math.trunc(absoluteOffset / 60), 2);
      const minuteOffset = addLeadingZeros(absoluteOffset % 60, 2);
      // If less than 0, the sign is +, because it is ahead of time.
      const sign = offset < 0 ? '+' : '-';

      tzOffset = `${sign}${hourOffset}:${minuteOffset}`;
    } else {
      tzOffset = 'Z';
    }

    const hour = addLeadingZeros(date_.getHours(), 2);
    const minute = addLeadingZeros(date_.getMinutes(), 2);
    const second = addLeadingZeros(date_.getSeconds(), 2);

    // If there's also date, separate it with time with 'T'
    const separator = result === '' ? '' : 'T';

    // Creates a time string consisting of hour, minute, and second, separated by delimiters, if defined.
    const time = [hour, minute, second].join(timeDelimiter);

    // HHmmss or HH:mm:ss.
    result = `${result}${separator}${time}${tzOffset}`;
  }

  return result;
}

/* eslint-enable */