/**
 * earth-now.co
 * Author:  Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 * File:    apps/web/lib/messages.ts
 * Purpose: Pure locale/message helpers (fr + en UI strings) usable from both server and client components
 */

import fr from "../messages/fr.json";
import en from "../messages/en.json";
import type { Locale } from "./api";

export type MessageKey = keyof typeof fr;
export type Messages = Record<MessageKey, string>;

const MESSAGES: Record<Locale, Messages> = { fr, en };

export const DEFAULT_LOCALE: Locale = "fr";

export function isLocale(value: unknown): value is Locale {
  return value === "fr" || value === "en";
}

export function getMessages(locale: Locale): Messages {
  return MESSAGES[locale];
}

/** Translate a key for a locale — usable server-side (pages) and client-side (via useI18n). */
export function translate(locale: Locale, key: MessageKey): string {
  return MESSAGES[locale][key];
}

/** Format an ISO date for display (UTC, no hand-rolled date arithmetic). */
export function formatDateUtc(iso: string, locale: Locale): string {
  const ms = Date.parse(iso);
  if (Number.isNaN(ms)) return iso;
  return new Intl.DateTimeFormat(locale === "fr" ? "fr-FR" : "en-GB", {
    dateStyle: "medium",
    timeZone: "UTC",
  }).format(new Date(ms));
}