export const LOCALE_COOKIE = "adc_locale";

export const locales = ["nl", "en", "yue"] as const;
export type Locale = (typeof locales)[number];

type TranslationKey =
  | "appName"
  | "articles.title"
  | "articles.description"
  | "articles.count"
  | "articles.heading"
  | "articles.code"
  | "articles.descriptionColumn"
  | "articles.loading"
  | "articles.emptyTitle"
  | "articles.emptyDescription"
  | "articles.error"
  | "articles.search"
  | "auth.logout"
  | "login.title"
  | "login.description"
  | "login.demoCredentials"
  | "login.username"
  | "login.password"
  | "login.submit"
  | "login.submitting"
  | "login.invalidCredentials"
  | "login.unexpectedError"
  | "language.label";

const translations: Record<Locale, Record<TranslationKey, string>> = {
  nl: {
    appName: "ADC BestelApp",
    "articles.title": "SAP Business One Artikelen",
    "articles.description": "Overzicht van artikelen opgehaald via de SAP Business One Service Layer.",
    "articles.count": "Aantal artikelen",
    "articles.heading": "Artikelen",
    "articles.code": "Artikelcode",
    "articles.descriptionColumn": "Omschrijving",
    "articles.loading": "Artikelen laden...",
    "articles.emptyTitle": "Geen artikelen gevonden",
    "articles.emptyDescription": "De Service Layer heeft geen artikelen teruggegeven.",
    "articles.error": "Er is een fout opgetreden bij het ophalen van de artikelen.",
    "articles.search": "Zoeken",
    "auth.logout": "Uitloggen",
    "login.title": "Inloggen",
    "login.description": "Log in om de artikelen te bekijken.",
    "login.demoCredentials": "Gebruikersnaam: admin, wachtwoord: admin",
    "login.username": "Gebruikersnaam",
    "login.password": "Wachtwoord",
    "login.submit": "Inloggen",
    "login.submitting": "Bezig met inloggen...",
    "login.invalidCredentials": "Ongeldige gebruikersnaam of wachtwoord.",
    "login.unexpectedError": "Er is een fout opgetreden. Probeer het opnieuw.",
    "language.label": "Taal",
  },
  en: {
    appName: "ADC Order App",
    "articles.title": "SAP Business One Items",
    "articles.description": "Overview of items retrieved through the SAP Business One Service Layer.",
    "articles.count": "Number of items",
    "articles.heading": "Items",
    "articles.code": "Item code",
    "articles.descriptionColumn": "Description",
    "articles.loading": "Loading items...",
    "articles.emptyTitle": "No items found",
    "articles.emptyDescription": "The Service Layer returned no items.",
    "articles.error": "An error occurred while retrieving the items.",
    "articles.search": "Search",
    "auth.logout": "Log out",
    "login.title": "Sign in",
    "login.description": "Sign in to view the items.",
    "login.demoCredentials": "Username: admin, password: admin",
    "login.username": "Username",
    "login.password": "Password",
    "login.submit": "Sign in",
    "login.submitting": "Signing in...",
    "login.invalidCredentials": "Invalid username or password.",
    "login.unexpectedError": "An error occurred. Please try again.",
    "language.label": "Language",
  },
  yue: {
    appName: "ADC 訂貨應用程式",
    "articles.title": "SAP Business One 貨品",
    "articles.description": "透過 SAP Business One Service Layer 取得嘅貨品一覽。",
    "articles.count": "貨品數量",
    "articles.heading": "貨品",
    "articles.code": "貨品編號",
    "articles.descriptionColumn": "描述",
    "articles.loading": "載入貨品中...",
    "articles.emptyTitle": "搵唔到貨品",
    "articles.emptyDescription": "Service Layer 冇返回任何貨品。",
    "articles.error": "取得貨品時發生錯誤。",
    "articles.search": "搜尋",
    "auth.logout": "登出",
    "login.title": "登入",
    "login.description": "登入後查看貨品。",
    "login.demoCredentials": "使用者名稱：admin，密碼：admin",
    "login.username": "使用者名稱",
    "login.password": "密碼",
    "login.submit": "登入",
    "login.submitting": "登入中...",
    "login.invalidCredentials": "使用者名稱或密碼錯誤。",
    "login.unexpectedError": "發生錯誤，請再試一次。",
    "language.label": "語言",
  },
};

export function getLocale(value?: string): Locale {
  return locales.includes(value as Locale) ? (value as Locale) : "nl";
}

export function t(locale: Locale, key: TranslationKey): string {
  return translations[locale][key];
}

export function getLanguageName(locale: Locale): string {
  return { nl: "Nederlands", en: "English", yue: "廣東話" }[locale];
}

export type { TranslationKey };