GCTC-NTGC / TalentCloud

import { localizedField, localizedFieldNonNull } from "../models/app";

export type Locales = "en" | "fr";

type TranslatableKeysNonNull<T> = {

  [K in keyof T]: T[K] extends localizedFieldNonNull ? K : never;

}[keyof T];

type TranslatableKeys<T> = {

  [K in keyof T]: T[K] extends localizedField ? K : never;

}[keyof T];

export function localizeField<T>(

  locale: Locales,

  model: T,

  field: TranslatableKeys<T>,

): string | null {

  if (model[field] !== null) {

    return model[field][locale];

  }

  return null;

}

export function localizeFieldNonNull<T>(

  locale: Locales,

  model: T,

  field: TranslatableKeysNonNull<T>,

): string {

  // Even though we assume field is non-null... check anyway to avoid crashes.

  const value = model[field] ? model[field][locale] : null;

  if (value) {

    return value;

  }

  return locale === "en" ? "TRANSLATION MISSING" : "TRADUCTION MANQUANTE";

}

export function getLocale(locale: string): Locales {

  if (locale === "en" || locale === "fr") {

    return locale;

  }

  console.log("Warning: unknown locale. Defaulting to en.");

  return "en";

}

export function matchValueToModel<T>(

  locale: Locales,

  field: TranslatableKeys<T>,

  value: string,

  possibilities: T[],

): T | null {

  const matching = possibilities.filter(

    (model) => localizeField(locale, model, field) === value,

  );

  return matching.length > 0 ? matching[0] : null;

}