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import baseLogger from './logger.js';
function capitalize(string) {  return string.charAt(0).toUpperCase() + string.slice(1);}
class LanguageUtil {  constructor(options) {    this.options = options;
    this.whitelist = this.options.whitelist || false;    this.logger = baseLogger.create('languageUtils');  }
  getScriptPartFromCode(code) {    if (!code || code.indexOf('-') < 0) return null;
    const p = code.split('-');    if (p.length === 2) return null;    p.pop();    return this.formatLanguageCode(p.join('-'));  }
  getLanguagePartFromCode(code) {    if (!code || code.indexOf('-') < 0) return code;
    const p = code.split('-');    return this.formatLanguageCode(p[0]);  }
  formatLanguageCode(code) {    // http://www.iana.org/assignments/language-tags/language-tags.xhtml    if (typeof code === 'string' && code.indexOf('-') > -1) {      const specialCases = ['hans', 'hant', 'latn', 'cyrl', 'cans', 'mong', 'arab'];      let p = code.split('-');
      if (this.options.lowerCaseLng) {        p = p.map(part => part.toLowerCase());      } else if (p.length === 2) {        p[0] = p[0].toLowerCase();        p[1] = p[1].toUpperCase();
        if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());      } else if (p.length === 3) {        p[0] = p[0].toLowerCase();
        // if lenght 2 guess it's a country        if (p[1].length === 2) p[1] = p[1].toUpperCase();        if (p[0] !== 'sgn' && p[2].length === 2) p[2] = p[2].toUpperCase();
        if (specialCases.indexOf(p[1].toLowerCase()) > -1) p[1] = capitalize(p[1].toLowerCase());        if (specialCases.indexOf(p[2].toLowerCase()) > -1) p[2] = capitalize(p[2].toLowerCase());      }
      return p.join('-');    }
    return this.options.cleanCode || this.options.lowerCaseLng ? code.toLowerCase() : code;  }
  isWhitelisted(code) {    if (this.options.load === 'languageOnly' || this.options.nonExplicitWhitelist) {      code = this.getLanguagePartFromCode(code);    }    return !this.whitelist || !this.whitelist.length || this.whitelist.indexOf(code) > -1;  }
  getFallbackCodes(fallbacks, code) {    if (!fallbacks) return [];    if (typeof fallbacks === 'string') fallbacks = [fallbacks];    if (Object.prototype.toString.apply(fallbacks) === '[object Array]') return fallbacks;
    if (!code) return fallbacks.default || [];
    // asume we have an object defining fallbacks    let found = fallbacks[code];    if (!found) found = fallbacks[this.getScriptPartFromCode(code)];    if (!found) found = fallbacks[this.formatLanguageCode(code)];    if (!found) found = fallbacks.default;
    return found || [];  }
  toResolveHierarchy(code, fallbackCode) {    const fallbackCodes = this.getFallbackCodes(      fallbackCode || this.options.fallbackLng || [],      code,    );
    const codes = [];    const addCode = c => {      if (!c) return;      if (this.isWhitelisted(c)) {        codes.push(c);      } else {        this.logger.warn(`rejecting non-whitelisted language code: ${c}`);      }    };
    if (typeof code === 'string' && code.indexOf('-') > -1) {      if (this.options.load !== 'languageOnly') addCode(this.formatLanguageCode(code));      if (this.options.load !== 'languageOnly' && this.options.load !== 'currentOnly')        addCode(this.getScriptPartFromCode(code));      if (this.options.load !== 'currentOnly') addCode(this.getLanguagePartFromCode(code));    } else if (typeof code === 'string') {      addCode(this.formatLanguageCode(code));    }
    fallbackCodes.forEach(fc => {      if (codes.indexOf(fc) < 0) addCode(this.formatLanguageCode(fc));    });
    return codes;  }}
export default LanguageUtil;