/*
 * 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.api.context.notification;

import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.core.api.context.MuleContextAware;
import org.mule.runtime.core.util.ClassUtils;

import java.util.EventObject;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * <code>ServerNotification</code> is an event triggered by something happening in the Server itself such as the server starting
 * or a service being registered.
 */
public abstract class ServerNotification extends EventObject implements MuleContextAware {

  public static final int NO_ACTION_ID = Integer.MIN_VALUE;
  public static final String NO_ACTION_NAME = "none";

  public static final String TYPE_TRACE = "trace";
  public static final String TYPE_INFO = "info";
  public static final String TYPE_WARNING = "warn";
  public static final String TYPE_ERROR = "error";
  public static final String TYPE_FATAL = "fatal";

  protected static final int CONTEXT_EVENT_ACTION_START_RANGE = 100;
  protected static final int SECURITY_EVENT_ACTION_START_RANGE = 400;
  protected static final int MANAGEMENT_EVENT_ACTION_START_RANGE = 500;
  protected static final int ADMIN_EVENT_ACTION_START_RANGE = 600;
  protected static final int CONNECTION_EVENT_ACTION_START_RANGE = 700;
  protected static final int MESSAGE_EVENT_ACTION_START_RANGE = 800;
  protected static final int MESSAGE_EVENT_END_ACTION_START_RANGE = 850;
  protected static final int SPACE_EVENT_ACTION_START_RANGE = 900;
  protected static final int REGISTRY_EVENT_ACTION_START_RANGE = 1000;
  protected static final int EXCEPTION_EVENT_ACTION_START_RANGE = 1100;
  protected static final int TRANSACTION_EVENT_ACTION_START_RANGE = 1200;
  protected static final int ROUTING_EVENT_ACTION_START_RANGE = 1300;
  protected static final int COMPONENT_EVENT_ACTION_START_RANGE = 1400;
  protected static final int FLOW_CONSTRUCT_EVENT_ACTION_START_RANGE = 1500;
  protected static final int MESSAGE_PROCESSOR_EVENT_ACTION_START_RANGE = 1600;
  protected static final int CLUSTER_NODE_EVENT_ACTION_START_RANGE = 1700;
  protected static final int PIPELINE_MESSAGE_EVENT_ACTION_START_RANGE = 1800;
  protected static final int ASYNC_MESSAGE_EVENT_ACTION_START_RANGE = 1900;
  protected static final int EXCEPTION_STRATEGY_MESSAGE_EVENT_ACTION_START_RANGE = 2000;

  public static final int CUSTOM_EVENT_ACTION_START_RANGE = 100000;

  public static final int NULL_ACTION = 0;
  public static final Object NULL_MESSAGE = "";

  public final String EVENT_NAME = ClassUtils.getClassName(getClass());

  protected String serverId;

  protected long timestamp;

  protected int action = NULL_ACTION;

  private static Map<Integer, String> actionIdToName = new ConcurrentHashMap<>();

  private static Map<String, Integer> actionNameToId = new ConcurrentHashMap<>();

  /**
   * The resourceIdentifier is used when firing inbound server notifications such as Admin notifications or other action
   * notifications triggered by an external source Used to associate the event with a particular resource. For example, if the
   * event was a ServiceNotification the resourceIdentifier could be the name of a particular service
   */
  protected String resourceIdentifier = null;

  protected transient MuleContext muleContext;

  public ServerNotification(Object message, int action) {
    this(message, action, null);
  }

  public ServerNotification(Object message, int action, String resourceIdentifier) {
    super((message == null ? NULL_MESSAGE : message));
    this.action = action;
    this.resourceIdentifier = resourceIdentifier;
    timestamp = System.currentTimeMillis();
  }

  @Override
  public void setMuleContext(MuleContext context) {
    muleContext = context;
    serverId = context.getId();
  }

  public int getAction() {
    return action;
  }

  public String getServerId() {
    return serverId;
  }

  public String getResourceIdentifier() {
    return resourceIdentifier;
  }

  public long getTimestamp() {
    return timestamp;
  }

  @Override
  public String toString() {
    return EVENT_NAME + "{" + "action=" + getActionName(action) + ", resourceId=" + resourceIdentifier + ", serverId=" + serverId
        + ", timestamp=" + timestamp + "}";
  }

  public String getType() {
    return TYPE_INFO;
  }

  public String getActionName() {
    return getActionName(action);
  }

  protected static synchronized void registerAction(String name, int i) {
    String lowerCaseName = name.toLowerCase();
    Integer id = new Integer(i);
    if (actionNameToId.containsKey(lowerCaseName)) {
      throw new IllegalStateException("Action " + name + " already registered");
    }
    if (actionIdToName.containsKey(id)) {
      throw new IllegalStateException("Action id " + i + " already registered");
    }
    actionIdToName.put(id, lowerCaseName);
    actionNameToId.put(lowerCaseName, id);
  }

  public static String getActionName(int action) {
    if (action == NO_ACTION_ID) {
      return NO_ACTION_NAME;
    }
    Integer key = new Integer(action);
    if (actionIdToName.containsKey(key)) {
      return actionIdToName.get(key);
    } else {
      throw new IllegalArgumentException("No action with id: " + action);
    }
  }

  public static int getActionId(String action) {
    String lowerCaseName = action.toLowerCase();
    if (actionNameToId.containsKey(lowerCaseName)) {
      return actionNameToId.get(lowerCaseName).intValue();
    } else {
      throw new IllegalArgumentException("No action called: " + action);
    }
  }

}