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

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

/**
 * The {@link formatRFC3339} function options.
 */
export interface FormatRFC3339Options extends ContextOptions<Date> {
  /** The number of digits after the decimal point after seconds, defaults to 0 */
  fractionDigits?: 0 | 1 | 2 | 3;
}

/**
 * @name formatRFC3339
 * @category Common Helpers
 * @summary Format the date according to the RFC 3339 standard (https://tools.ietf.org/html/rfc3339#section-5.6).
 *
 * @description
 * Return the formatted date string in RFC 3339 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
 *
 * @throws `date` must not be Invalid Date
 *
 * @example
 * // Represent 18 September 2019 in RFC 3339 format:
 * formatRFC3339(new Date(2019, 8, 18, 19, 0, 52))
 * //=> '2019-09-18T19:00:52Z'
 *
 * @example
 * // Represent 18 September 2019 in RFC 3339 format, 3 digits of second fraction
 * formatRFC3339(new Date(2019, 8, 18, 19, 0, 52, 234), {
 *   fractionDigits: 3
 * })
 * //=> '2019-09-18T19:00:52.234Z'
 */
export function formatRFC3339(date: DateArg<Date> & {}, options?: FormatRFC3339Options): string {
  const date_ = toDate(date, options?.in);

  if (!isValid(date_)) {
    throw new RangeError('Invalid time value');
  }

  const fractionDigits = options?.fractionDigits ?? 0;

  const day = addLeadingZeros(date_.getDate(), 2);
  const month = addLeadingZeros(date_.getMonth() + 1, 2);
  const year = date_.getFullYear();

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

  let fractionalSecond = '';
  if (fractionDigits > 0) {
    const milliseconds = date_.getMilliseconds();
    const fractionalSeconds = Math.trunc(milliseconds * Math.pow(10, fractionDigits - 3));
    fractionalSecond = '.' + addLeadingZeros(fractionalSeconds, fractionDigits);
  }

  let offset = '';
  const tzOffset = date_.getTimezoneOffset();

  if (tzOffset !== 0) {
    const absoluteOffset = Math.abs(tzOffset);
    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 = tzOffset < 0 ? '+' : '-';

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

  return `${year}-${month}-${day}T${hour}:${minute}:${second}${fractionalSecond}${offset}`;
}

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