/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.core.config.i18n;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The <code>LocaleMessageHandler</code> is essentially a merging of the Message and Messages classes, since there is no good
 * reason to have them separate. A key point is that this Handler is meant to be used for application-specific messages, rather
 * than core system messages. (That's not to say it couldn't eventually replace the latter, however). Note that message codes are
 * Strings here, instead of the ints in Message.
 * <p/>
 * The LocaleMessageHandler can be called directly, but is really meant to be called by LocaleMessage classes as done in the
 * examples.
 * <p/>
 * Note that this class assumes the resource bundle is in the format <bundle-name>-messages and is located at the top of the jar
 * or classes directory. We can later add the ability to specify a path prefix.
 */
public class LocaleMessageHandler {

  /**
   * logger used by this class
   */
  protected static final Logger logger = LoggerFactory.getLogger(LocaleMessageHandler.class);

  /**
   * Get the resource string for the given bundle name and resource code
   */
  public static String getString(String bundleName, String code) {
    return getString(bundleName, code, new Object[] {});
  }

  /**
   * Get the resource string for the given bundle name, resource code and one argument
   */
  public static String getString(String bundleName, String code, Object arg1) {
    if (arg1 == null) {
      arg1 = "null";
    }

    return getString(bundleName, code, new Object[] {arg1});
  }

  /**
   * Get the resource string for the given bundle name, resource code and two arguments
   */
  public static String getString(String bundleName, String code, Object arg1, Object arg2) {
    if (arg1 == null) {
      arg1 = "null";
    }

    if (arg2 == null) {
      arg2 = "null";
    }

    return getString(bundleName, code, new Object[] {arg1, arg2});
  }

  /**
   * Get the resource string for the given bundle name, resource code and array of arguments.
   */
  public static String getString(String bundleName, String code, Object[] args) {
    return getString(bundleName, Locale.getDefault(), code, args);
  }

  /**
   * Get the resource string for the given bundle name, locale, resource code and array of arguments. All above methods invoke
   * this one.
   */
  public static String getString(String bundleName, Locale locale, String code, Object[] args) {
    String path = bundleName + "-messages";
    ResourceBundle bundle = ResourceBundle.getBundle(path, locale);
    String m = bundle.getString(code);

    if (m == null) {
      logger.error("Failed to find message for id " + code + " in resource bundle " + path);
      return "";
    }

    return MessageFormat.format(m, args);
  }

}