import { en, type Dict } from "./en";
import { fr } from "./fr";
export type Locale = "en" | "fr";
export const LOCALES: Locale[] = ["en", "fr"];
export const dict: Record<Locale, Dict> = { en, fr };
export function t(locale: Locale): Dict { return dict[locale] ?? en; }
/** Prefix a canonical path with the locale segment (FR only; EN is the canonical, unprefixed form). */
export function href(locale: Locale, path: string): string {
  if (locale === "en") return path;
  if (path.startsWith("/api/") || path.startsWith("/admin") || path.startsWith("/login") || path.startsWith("http")) return path;
  return path === "/" ? "/fr" : `/fr${path}`;
}
export function pickLocale(v: string | null | undefined): Locale { return v === "fr" ? "fr" : "en"; }
const MONTHS: Record<Locale, string[]> = {
  en: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  fr: ["janvier", "février", "mars", "avril", "mai", "juin", "juillet", "août", "septembre", "octobre", "novembre", "décembre"],
};
/** Format a date with its declared precision (day / month / year) — never invents a day that the source did not state. */
export function fmtDate(locale: Locale, d: string | Date | null | undefined, precision: "day" | "month" | "year" = "month"): string {
  if (!d) return "";
  const date = typeof d === "string" ? new Date(d.length === 10 ? d + "T12:00:00Z" : d) : d;
  if (Number.isNaN(date.getTime())) return "";
  const y = date.getUTCFullYear(), m = date.getUTCMonth(), day = date.getUTCDate();
  if (precision === "year") return String(y);
  if (precision === "month") return locale === "fr" ? `${MONTHS.fr[m]} ${y}` : `${MONTHS.en[m]} ${y}`;
  return locale === "fr" ? `${day} ${MONTHS.fr[m]} ${y}` : `${MONTHS.en[m]} ${day}, ${y}`;
}
export function fmtInt(locale: Locale, n: number): string { return new Intl.NumberFormat(locale === "fr" ? "fr-CA" : "en-CA").format(n); }
export function pick<T extends Record<string, unknown>>(row: T, base: string, locale: Locale): string {
  const frv = row[`${base}_fr`] as string | null | undefined; const env = row[`${base}_en`] as string | null | undefined;
  return (locale === "fr" && frv) ? frv : (env ?? (row[base] as string) ?? "");
}