// Shared formatting helpers and common template variables for emails.

import { db, dbGet, siteSettings } from '../../db/index.js';
import { getCache } from '../stores/cache.js';

/**
 * Get common variables for all emails
 */
export function getCommonVariables(): Record<string, string> {
  return {
    siteName: 'Spanglish',
    siteUrl: process.env.FRONTEND_URL || 'https://spanglish.com',
    currentYear: new Date().getFullYear().toString(),
    supportEmail: process.env.EMAIL_FROM || 'hello@spanglish.com',
  };
}

/**
 * Get the site timezone from settings (cached for performance).
 * Cached for a short TTL via the cache abstraction (in-memory or Redis).
 */
export async function getSiteTimezone(): Promise<string> {
  const cached = await getCache().get<string>('site:timezone');
  if (cached) return cached;

  const settings = await dbGet<any>(
    (db as any).select().from(siteSettings).limit(1)
  );
  const timezone = settings?.timezone || 'America/Asuncion';
  await getCache().set('site:timezone', timezone, 60);
  return timezone;
}

/**
 * Format date for emails using site timezone
 */
export function formatDate(dateStr: string, locale: string = 'en', timezone: string = 'America/Asuncion'): string {
  const date = new Date(dateStr);
  return date.toLocaleDateString(locale === 'es' ? 'es-ES' : 'en-US', {
    weekday: 'long',
    year: 'numeric',
    month: 'long',
    day: 'numeric',
    timeZone: timezone,
  });
}

/**
 * Format time for emails using site timezone
 */
export function formatTime(dateStr: string, locale: string = 'en', timezone: string = 'America/Asuncion'): string {
  const date = new Date(dateStr);
  return date.toLocaleTimeString(locale === 'es' ? 'es-ES' : 'en-US', {
    hour: '2-digit',
    minute: '2-digit',
    timeZone: timezone,
  });
}

/**
 * Format currency for emails. Kept distinct from lib/utils.ts formatCurrency
 * because the email output format ("12.345 PYG" / "$10.00 USD") must not change.
 */
export function formatCurrency(amount: number, currency: string = 'PYG'): string {
  if (currency === 'PYG') {
    return `${amount.toLocaleString('es-PY')} PYG`;
  }
  return `$${amount.toFixed(2)} ${currency}`;
}