import type { NextcloudRating, RatingLevel } from '@/lib/nextcloud-status-api';

/**
 * Darstellung der Ampel (quick-261002-k67), gemeinsam fuer Modulseite und
 * Dashboard-Kachel. Bewusst vollstaendige, statische Klassenzeichenketten —
 * Tailwind findet Klassen nur, wenn sie woertlich im Quelltext stehen.
 *
 * `fill` = Flaeche (Leiste, Punkt), `pill` = Pille (12 % Flaeche + Textvariante),
 * `text` = Schrift in Statusfarbe.
 */
export const RATING_STYLE: Record<RatingLevel, { fill: string; pill: string; text: string }> = {
  green: {
    fill: 'bg-status-ok',
    pill: 'bg-status-ok/12 text-status-ok-fg',
    text: 'text-status-ok-fg',
  },
  yellow: {
    fill: 'bg-status-warn',
    pill: 'bg-status-warn/12 text-status-warn-fg',
    text: 'text-status-warn-fg',
  },
  red: {
    fill: 'bg-status-down',
    pill: 'bg-status-down/12 text-status-down-fg',
    text: 'text-status-down-fg',
  },
  unknown: {
    fill: 'bg-status-idle',
    pill: 'bg-status-idle/12 text-status-idle-fg',
    text: 'text-status-idle-fg',
  },
};

type Translate = (key: string, values?: Record<string, string | number>) => string;

/** 'YYYY-MM-DD' als Datum nach Sprache, in UTC (kein Tagesversatz durch die Zeitzone). */
export function formatEolDate(isoDay: string, locale: string): string {
  const date = new Date(`${isoDay}T00:00:00Z`);
  if (Number.isNaN(date.getTime())) return isoDay;
  return new Intl.DateTimeFormat(locale, {
    timeZone: 'UTC',
    day: '2-digit',
    month: '2-digit',
    year: 'numeric',
  }).format(date);
}

/**
 * Kurzer Klartext zur Bewertung. `t` ist der Uebersetzer des Namensraums
 * `nextcloudStatus`; die API liefert nur Grundkennung plus Parameter (D-B).
 */
export function ratingReasonText(t: Translate, rating: NextcloudRating, locale: string): string {
  switch (rating.reason) {
    case 'current':
      return t('reason.current');
    case 'update-available':
      return t('reason.updateAvailable', { version: rating.updateTo ?? '' });
    case 'eol-soon':
      return t('reason.eolSoon', {
        date: rating.eolDate ? formatEolDate(rating.eolDate, locale) : '',
      });
    case 'eol-passed':
      return rating.eolDate
        ? t('reason.eolPassed', { date: formatEolDate(rating.eolDate, locale) })
        : t('reason.eolPassedNoDate');
    case 'unreachable':
      return t('reason.unreachable');
    case 'invalid-response':
      return t('reason.invalidResponse');
    case 'maintenance':
      return t('reason.maintenance');
    case 'needs-db-upgrade':
      return t('reason.needsDbUpgrade');
    case 'no-reference':
      return t('reason.noReference');
    case 'version-unknown':
      return t('reason.versionUnknown');
    case 'not-checked':
      return t('reason.notChecked');
  }
}