import russian from "./locales/ru.json";

export type Locale = "en" | "ru";
export type LanguagePreference = Locale | "auto";
export const languageCookie = "minegeo-language";
export const localeTag = (locale: Locale) =>
  locale === "ru" ? "ru-RU" : "en-GB";

export function detectLocale(acceptLanguage: string | null): Locale {
  const languages = (acceptLanguage ?? "")
    .split(",")
    .map((entry, index) => {
      const [tag, ...parameters] = entry.trim().toLowerCase().split(";");
      const quality = parameters.find((parameter) =>
        parameter.trim().startsWith("q="),
      );
      return {
        tag: tag.split("-")[0],
        weight: quality ? Number(quality.trim().slice(2)) : 1,
        index,
      };
    })
    .filter(
      ({ weight }) => Number.isFinite(weight) && weight > 0 && weight <= 1,
    )
    .sort((a, b) => b.weight - a.weight || a.index - b.index);
  return (
    (languages.find(({ tag }) => tag === "ru" || tag === "en")
      ?.tag as Locale) || "en"
  );
}

export function resolveLocale(
  preference: string | undefined,
  acceptLanguage: string | null,
): Locale {
  return preference === "en" || preference === "ru"
    ? preference
    : detectLocale(acceptLanguage);
}

export function translator(locale: Locale) {
  return (message: string, values?: Record<string, string | number>) => {
    const translated =
      locale === "ru"
        ? ((russian as Record<string, string>)[message] ?? message)
        : message;
    return values
      ? translated.replace(/\{(\w+)\}/g, (match, key) =>
          String(values[key] ?? match),
        )
      : translated;
  };
}

export function statusMessage(status: string) {
  const labels: Record<string, string> = {
    draft: "Draft",
    uploading: "Uploading",
    processing: "Processing",
    review: "Awaiting review",
    published: "Published",
    failed: "Failed",
    rejected: "Rejected",
    submitted: "Submitted",
    accepted: "Accepted",
    queued: "Queued",
    running: "In progress",
    open: "Open",
    approved: "Approved",
    closed: "Closed",
    withdrawn: "Withdrawn",
  };
  return labels[status] ?? status;
}