helpers.ts

import { env } from 'process';
import { Date, Article } from './types';

import ordinal from 'ordinal';

export const IS_PRODUCTION = env.NODE_ENV === 'production';
export const IS_PRINT = env.IS_PRINT === 'print';

export function ifSet<T>(x: T, y: string | ((value: NonNullable<T>) => string)): string {
  if (x) {
    if (typeof y === 'function') {
      return y(x);
    }

    return y;
  }

  return '';
}

export function asAttr(name: string, value: string | undefined): string {
  return ifSet(value, ` ${name}="${value}"`);
}

const numberFormatter = new Intl.NumberFormat('en');

export function formatNumberString(it: string | number): string {
  if (typeof it === 'number') {
    return numberFormatter.format(it);
  }

  return it;
}

const months =
  ["January"
    , "February"
    , "March"
    , "April"
    , "May"
    , "June"
    , "July"
    , "August"
    , "September"
    , "October"
    , "November"
    , "December"
  ];

const days = 
  [
   "Sunday",
   "Monday",
   "Tuesday",
   "Wednesday",
   "Thursday",
   "Friday",
   "Saturday"
  ];

export function renderExplicitDate(date: Date, omitIfJustYear: boolean): string | null {
  if (typeof date === 'number') {
    date = { year: date };
  }

  if ('month' in date) {
    const month = months[date.month - 1];
    if ('day' in date) {
      if (date.OS) {
        const actualDate =
          (date.month < 3 || date.month === 3 && date.day < 25)
          ? new globalThis.Date(date.year + 1, date.month - 1, date.day)
          : new globalThis.Date(date.year, date.month - 1, date.day);

        const day = (((actualDate.getDay() - 10) % 7) + 7) % 7;
        return `${days[day]}, ${ordinal(date.day)} ${month} ${date.year} [<abbr title="old-style">OS</abbr>]`;
      }

      const actualDate = new globalThis.Date(date.year, date.month - 1, date.day);
      const day = actualDate.getDay();
      return `${days[day]}, ${ordinal(date.day)} ${month} ${date.year}`;
    }

    return `${month} ${date.year}`;
  }

  if ('season' in date) {
    return `${date.season} ${date.year}`;
  }

  if (omitIfJustYear) {
    return null;
  }

  return null;
}

export function isolate(value: string): string {
  return `&#x2068;${value}&#x2069;`;
}

export function purify(str: string): string {
  return str.replaceAll('&', '&amp;')
    .replaceAll('<', '&lt;')
    .replaceAll('>', '&gt;')
    .replaceAll('\'', '&#039;')
    .replaceAll('"', '&quot;');
}

export function renderArticle(article: Article) {
  if (!IS_PRODUCTION || !article.draft) {
    return `<li><a href="${article.url}"${asAttr("lang", article.titleLang)}>${article.title}</a>`
      + ifSet(article.draft, ' <span class="draft">Draft</span>')
      + (article.children ? renderArticleList(article.children) : '')
      + `</li>`;
  }

  // render draft article names if they have children
  if (article.children?.length) {
    return `<li><span${asAttr("lang", article.titleLang)}>${article.title}</span>`
      + (article.children ? renderArticleList(article.children) : '')
      + `</li>`;
  }

  return '';
}

export function renderArticleList(articles: readonly Article[]) {
  if (articles.length === 0) {
    return '';
  }

  let result = '<ul class="article-list">';
  for (const article of articles) {
    result += renderArticle(article);
  }

  result += "</ul>";
  return result;
}