library-ts/browser/i18n/LanguageCode.ts

import { ElementType } from "../dom/ElementType";


export type de = "de";
export type en = "en";
export type es = "es";
export type fr = "fr";
export type it = "it";
export type ja = "ja";
export type pt = "pt";
export type ru = "ru";
export type zh = "zh";


export type LanguageCode =
  de |
  en |
  es |
  fr |
  it |
  ja |
  pt |
  ru |
  zh 
;

export class LanguageCodes
{
  static #current:LanguageCode = "en";
  static get current(){ return this.#current; }
  static setCurrent( lc:LanguageCode )
  {
    this.#current = lc;
  }

  static fallback:LanguageCode = "en";

  static readonly de:de = "de";
  static readonly en:en = "en";
  static readonly es:es = "es";
  static readonly fr:fr = "fr";
  static readonly it:it = "it";
  static readonly ja:ja = "ja";
  static readonly pt:pt = "pt";
  static readonly ru:ru = "ru";
  static readonly zh:zh = "zh";
  
  static #htmlTypes = new Map<LanguageCode,ElementType<Element>>();

  static htmlType( code:LanguageCode ):ElementType<Element>
  {
    if ( this.#htmlTypes.has( code ) )
    {
      return this.#htmlTypes.get( code );
    }

    this.#htmlTypes.set( code, new ElementType( "lang--" + code ) );

    return this.#htmlTypes.get( code );
  } 

 
  static get all()
  {
    let list = 
    [
      LanguageCodes.de,
      LanguageCodes.en,
      LanguageCodes.es,
      LanguageCodes.fr,
      LanguageCodes.it,
      LanguageCodes.ja,
      LanguageCodes.pt,
      LanguageCodes.ru,
      LanguageCodes.zh
    ];

    return list;    
  }

  static stringToLanguageCode( value:string )
  {
    value = value.toLowerCase();

    let index = LanguageCodes.all.indexOf( value as LanguageCode );

    return index === -1 ? null : LanguageCodes.all[ index ];    
  }
}