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/*
 * 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.kalumet.utils;

import org.apache.kalumet.model.Destination;
import org.apache.kalumet.model.Email;
import org.apache.kalumet.model.Environment;
import org.apache.kalumet.model.Notifiers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.LinkedList;

/**
 * Util class to notify that an update will start.
 */
public class NotifierUtils
{

  private final static transient Logger LOGGER = LoggerFactory.getLogger( NotifierUtils.class );

  /**
   * Wait the count down and send e-mail to notifiers.
   *
   * @param environment the target environment.
   */
  public static void waitAndNotify( Environment environment )
  {
    Notifiers notifiers = environment.getNotifiers();
    LOGGER.debug(
      "Send e-mail to notify people for the update of the environment {} and wait the count down ({} minute(s)).",
      environment.getName(), notifiers.getCountdown() );
    LOGGER.debug( "Construct the e-mail content." );
    LOGGER.debug( "Load the e-mail template." );
    InputStreamReader notifyTemplate =
      new InputStreamReader( NotifierUtils.class.getResourceAsStream( "/templates/notifier.html" ) );
    Object[] values = new Object[2];
    values[0] = environment.getName();
    values[1] = new Integer( notifiers.getCountdown() ).toString();
    String notifyContent = null;
    try
    {
      notifyContent = EmailUtils.format( notifyTemplate, values );
      // send the notification
      LOGGER.debug( "Send the notification." );
      LOGGER.debug( "Iterator on the notifier list." );
      for ( Iterator notifierIterator = notifiers.getNotifiers().iterator(); notifierIterator.hasNext(); )
      {
        Email email = (Email) notifierIterator.next();
        LOGGER.debug( "Construct the address list." );
        LinkedList addresses = new LinkedList();
        for ( Iterator destinationIterator = email.getDestinations().iterator(); destinationIterator.hasNext(); )
        {
          Destination destination = (Destination) destinationIterator.next();
          addresses.add( VariableUtils.replace( destination.getAddress(), environment.getVariables() ) );
        }
        EmailUtils.sendHTMLEmail( VariableUtils.replace( email.getMailhost(), environment.getVariables() ),
                                  VariableUtils.replace( email.getFrom(), environment.getVariables() ),
                                  "Apache Kalumet Notification - Environment " + environment.getName(), addresses,
                                  notifyContent );
      }
    }
    catch ( Exception e )
    {
      LOGGER.warn( "Can't send notification.", e );
    }
    LOGGER.debug( "Waiting for the countdown (" + notifiers.getCountdown() + " minute(s)) ..." );
    try
    {
      Thread.sleep( notifiers.getCountdown() * 60 * 1000 );
    }
    catch ( InterruptedException interruptedException )
    {
      LOGGER.warn( "Can't process notification count down.", interruptedException );
    }
  }

}