/*
 * Copyright 2012  Research Studios Austria Forschungsges.m.b.H.
 *
 *    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 won.bot.framework.eventbot.action.impl.debugbot;

import won.bot.framework.eventbot.EventListenerContext;

import java.net.URI;
import java.util.Date;

/**
 * Created by fkleedorfer on 10.06.2016.
 */
public class MessageTimingManager
{
  public static final String KEY_LAST_MESSAGE_IN_TIMESTAMPS = "lastMessageInTimestamps";
  public static final String KEY_LAST_MESSAGE_OUT_TIMESTAMPS = "lastMessageOutTimestamps";
  private EventListenerContext context;
  private int maxInstances;

  public MessageTimingManager(final EventListenerContext context, final int maxInstances) {
    this.context = context;
    this.maxInstances = maxInstances;
  }

  public static enum InactivityPeriod{
    ACTIVE(60*1000, 60*1000),SHORT(5*60*1000, 60*1000), LONG(10*60*1000, 120*1000), TOO_LONG(-1, 120*1000);

    InactivityPeriod(final long timeout, final long minimalPauseBetweenMessages) {
      this.timeout = timeout;
      this.minimalPauseBetweenMessages = minimalPauseBetweenMessages;
    }

    private long timeout;
    private long minimalPauseBetweenMessages;

    public long getTimeout() {
      return timeout;
    }
    public long getMinimalPauseBetweenMessages() { return minimalPauseBetweenMessages;}

    public boolean isWithin(long inactivityInMillis){
      return  inactivityInMillis <= timeout;
    }
    public boolean isPauseLongEnough(long pauseLengthInMIllis) { return pauseLengthInMIllis >=
      minimalPauseBetweenMessages;
    }

    public static InactivityPeriod getInactivityPeriod(Date lastAction){
      if (lastAction == null) return TOO_LONG;
      return getInactivityPeriod(lastAction, new Date());
    }

    public static InactivityPeriod getInactivityPeriod(Date lastAction, Date timeToCompare){
      if (lastAction == null) return TOO_LONG;
      if (timeToCompare == null) return TOO_LONG;
      long diff = timeToCompare.getTime() - lastAction.getTime();
      if (ACTIVE.isWithin(diff)) return ACTIVE;
      if (SHORT.isWithin(diff)) return SHORT;
      if (LONG.isWithin(diff)) return LONG;
      return TOO_LONG;
    }
  }

  public boolean isWaitedLongEnough(URI connectionUri){
    Date lastSent = (Date) context.getBotContext().loadFromObjectMap(KEY_LAST_MESSAGE_OUT_TIMESTAMPS,
                                                                     connectionUri.toString());
    if (lastSent == null) return false; //avoid sending messages on every actEvent if too many needs are connected
    return getInactivityPeriodOfPartner(connectionUri)
      .isPauseLongEnough(System.currentTimeMillis() - lastSent.getTime());
  }

  public InactivityPeriod getInactivityPeriodOfPartner(URI connectionUri){
    Date lastIn = (Date) context.getBotContext().loadFromObjectMap(KEY_LAST_MESSAGE_IN_TIMESTAMPS,
                                                                   connectionUri.toString());
    return InactivityPeriod.getInactivityPeriod(lastIn);
  }

  public InactivityPeriod getInactivityPeriodOfSelf(URI connectionUri){
    Date lastOut = (Date) context.getBotContext().loadFromObjectMap(KEY_LAST_MESSAGE_OUT_TIMESTAMPS,
                                                                    connectionUri.toString());
    return InactivityPeriod.getInactivityPeriod(lastOut);
  }

  public void updateMessageTimeForMessageSent(URI connectionUri){
    context.getBotContext().saveToObjectMap(KEY_LAST_MESSAGE_OUT_TIMESTAMPS, connectionUri.toString(), new Date());
  }

  public void updateMessageTimeForMessageReceived(URI connectionUri){
    context.getBotContext().saveToObjectMap(KEY_LAST_MESSAGE_IN_TIMESTAMPS, connectionUri.toString(), new Date());
  }
}