/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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 org.apache.geode.i18n;

import org.apache.geode.internal.i18n.AbstractStringIdResourceBundle;

import java.text.MessageFormat;
import java.util.Locale;

/**
 * This class forms the basis of the i18n strategy. Its primary function is to be used as a key to
 * be passed to an instance of StringIdResourceBundle.
 * 
 * @since GemFire 6.0
 */
public class StringId {
  /** The root name of the ResourceBundle */
  private static final String RESOURCE_CLASS =
      "org/apache/geode/internal/i18n/StringIdResourceBundle";

  /**
   * A unique identifier that is written when this StringId is logged to allow for reverse
   * translation.
   * 
   * @see org.apache.geode.internal.logging.LogWriterImpl
   */
  public final int id;
  /** the English translation of text */
  private final String text;
  /** ResourceBundle to use for translation, shared amongst all instances */
  private static volatile AbstractStringIdResourceBundle rb = null;
  /**
   * The locale of the current ResourceBundle, if this changes we must update the ResourceBundle.
   */
  private static volatile Locale currentLocale = null;

  private static boolean includeMsgIDs;

  /**
   * A StringId to allow users to log a literal String using the
   * {@link org.apache.geode.i18n.LogWriterI18n}
   */
  public static final StringId LITERAL = new StringId(1, "{0}");

  static {
    setLocale(Locale.getDefault());
  }

  /*
   * Update {@link #currentlocale} and {@link #rb} This method should be used sparingly as there is
   * a small window for a race condition.
   * 
   * @params locale switch to use this locale. if null then {@link Locale#getDefault()} is used.
   */
  public static void setLocale(Locale l) {
    Locale locale = l;
    if (locale == null) {
      locale = Locale.getDefault();
    }

    if (locale != currentLocale) {
      AbstractStringIdResourceBundle tempResourceBundle = StringId.getBundle(locale);
      currentLocale = locale;
      rb = tempResourceBundle;
      // do we want message ids included in output?
      // Only if we are using a resource bundle that has localized strings.
      includeMsgIDs = !rb.usingRawMode();
    }
  }

  /*
   * @return AbstractStringIdResourceBundle for the locale
   */
  private static AbstractStringIdResourceBundle getBundle(Locale l) {
    return AbstractStringIdResourceBundle.getBundle(RESOURCE_CLASS, l);
  }

  /**
   * Gemstone internal constructor, customers have no need to create instances of this class.
   */
  public StringId(int id, String text) {
    this.id = id;
    this.text = text;
  }

  /**
   * Accessor for the raw (unformatted) text of this StringId
   * 
   * @return unformated text
   **/
  public String getRawText() {
    return this.text;
  }

  /**
   * @return the English translation of this StringId
   **/
  @Override
  public String toString() {
    return MessageFormat.format(this.text, (Object[]) null);
  }


  /**
   * Substitutes parameter Objects into the text
   * 
   * @see java.text.MessageFormat
   * @return the English translation of this StringId
   **/
  public String toString(Object... params) {
    return MessageFormat.format(this.text, params);
  }

  /**
   * @return the translation of this StringId based on the current {@link java.util.Locale}
   **/
  public String toLocalizedString() {
    String idStr = "";
    if (includeMsgIDs) {
      idStr = "msgID " + this.id + ": ";
    }
    return MessageFormat.format(idStr + StringId.rb.getString(this), (Object[]) null);
  }

  /**
   * Substitutes parameter Objects into the text
   * 
   * @see java.text.MessageFormat
   * @return the translation of this StringId based on the current {@link java.util.Locale}
   **/
  public String toLocalizedString(Object... params) {
    String idStr = "";
    if (includeMsgIDs) {
      idStr = "msgID " + this.id + ": ";
    }
    return MessageFormat.format(idStr + StringId.rb.getString(this), params);
  }

  /**
   * Gemstone internal test method to access {@link #currentLocale}
   */
  static Locale getCurrentLocale() {
    return currentLocale;
  }

  /**
   * Gemstone internal test method to access {@link #rb}
   */
  static AbstractStringIdResourceBundle getActiveResourceBundle() {
    return rb;
  }
}