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

import type { Match } from '../../../locale/types.ts';
import { Parser } from '../Parser.ts';
import type { ParseFlags, ParseResult } from '../types.ts';
import { mapValue, normalizeTwoDigitYear, parseNDigits } from '../utils.ts';

export interface YearParserValue {
  year: number;
  isTwoDigitYear: boolean;
}

// From http://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html#Date_Format_Patterns
// | Year     |     y | yy |   yyy |  yyyy | yyyyy |
// |----------|-------|----|-------|-------|-------|
// | AD 1     |     1 | 01 |   001 |  0001 | 00001 |
// | AD 12    |    12 | 12 |   012 |  0012 | 00012 |
// | AD 123   |   123 | 23 |   123 |  0123 | 00123 |
// | AD 1234  |  1234 | 34 |  1234 |  1234 | 01234 |
// | AD 12345 | 12345 | 45 | 12345 | 12345 | 12345 |
export class YearParser extends Parser<YearParserValue> {
  priority = 130;
  incompatibleTokens: string[] = ['Y', 'R', 'u', 'w', 'I', 'i', 'e', 'c', 't', 'T'];

  parse(dateString: string, token: string, match: Match): ParseResult<YearParserValue> {
    const valueCallback = (year: number) => ({
      year,
      isTwoDigitYear: token === 'yy',
    });

    switch (token) {
      case 'y':
        return mapValue(parseNDigits(4, dateString), valueCallback);
      case 'yo':
        return mapValue(
          match.ordinalNumber(dateString, {
            unit: 'year',
          }),
          valueCallback,
        );
      default:
        return mapValue(parseNDigits(token.length, dateString), valueCallback);
    }
  }

  validate<DateType extends Date>(_date: DateType, value: YearParserValue): boolean {
    return value.isTwoDigitYear || value.year > 0;
  }

  set<DateType extends Date>(date: DateType, flags: ParseFlags, value: YearParserValue): DateType {
    const currentYear = date.getFullYear();

    if (value.isTwoDigitYear) {
      const normalizedTwoDigitYear = normalizeTwoDigitYear(value.year, currentYear);
      date.setFullYear(normalizedTwoDigitYear, 0, 1);
      date.setHours(0, 0, 0, 0);
      return date;
    }

    const year = !('era' in flags) || flags.era === 1 ? value.year : 1 - value.year;
    date.setFullYear(year, 0, 1);
    date.setHours(0, 0, 0, 0);
    return date;
  }
}

/* eslint-enable */