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/*
 * Copyright (c) 2010-2015 Bundesrechenzentrum GmbH - www.brz.gv.at
 * Copyright (c) 2015-2022 AUSTRIAPRO - www.austriapro.at
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package at.austriapro.ebinterface.ubl.helper;

import java.util.Locale;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;

import com.helger.commons.collection.impl.CommonsTreeMap;
import com.helger.commons.collection.impl.ICommonsCollection;
import com.helger.commons.collection.impl.ICommonsMap;
import com.helger.commons.locale.LocaleCache;
import com.helger.commons.locale.LocaleHelper;
import com.helger.commons.locale.country.CountryCache;
import com.helger.commons.string.StringHelper;

@Immutable
public final class MultilingualCountryCache
{
  // Cache all country codes in all display languages
  private static ICommonsMap  s_aNameToCodeMap = new CommonsTreeMap <> ();

  @Nonnull
  private static String _unify (@Nonnull final String s)
  {
    return s.toLowerCase (Locale.US);
  }

  static
  {
    final Locale aDefaultDisplayLocale = Locale.getDefault (Locale.Category.DISPLAY);

    final ICommonsCollection  aAllLocales = LocaleCache.getInstance ().getAllLocales ();
    for (final Locale aCountryLocale : aAllLocales)
    {
      s_aNameToCodeMap.put (_unify (aCountryLocale.getDisplayCountry (aDefaultDisplayLocale)), aCountryLocale);
      for (final Locale aDisplayLocale : aAllLocales)
        s_aNameToCodeMap.put (_unify (aCountryLocale.getDisplayCountry (aDisplayLocale)), aCountryLocale);
    }
  }

  private MultilingualCountryCache ()
  {}

  @Nullable
  public static String getRealCountryCode (@Nullable final String sCountry)
  {
    // Empty
    if (StringHelper.hasNoText (sCountry))
      return null;

    // Empty after trim?
    final String sRealCountry = sCountry.trim ();
    if (sRealCountry.length () == 0)
      return null;

    // Is the value already a code?
    if (CountryCache.getInstance ().containsCountry (sRealCountry))
      return LocaleHelper.getValidCountryCode (sRealCountry);

    // Is it a country display name?
    final Locale aCountry = s_aNameToCodeMap.get (_unify (sRealCountry));
    if (aCountry != null)
      return aCountry.getCountry ();

    // absolutely not found
    return null;
  }
}