/*
 * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * 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 net.java.sip.communicator.service.protocol.event;

import net.java.sip.communicator.service.protocol.*;

/**
 * CallPeerChangeEvent-s are triggerred whenever a change occurs in a
 * CallPeer. Dispatched events may be of one of the following types.
 * <p>
 * CALL_PEER_STATUS_CHANGE - indicates a change in the status of the
 * peer.
 * <p>
 * CALL_PEER_DISPLAY_NAME_CHANGE - means that peer's displayName
 * has changed
 * <p>
 * CALL_PEER_ADDRESS_CHANGE - means that peer's address has
 * changed.
 * <p>
 * CALL_PEER_ADDRESS_CHANGE - means that the transport address of the
 * peer (the one that we use to communicate with her) has changed.
 * <p>
 * CALL_PEER_IMAGE_CHANGE - peer updated photo.
 * <p>
 *
 * @author Emil Ivov
 */
public class CallPeerChangeEvent
    extends java.beans.PropertyChangeEvent
{
    /**
     * Serial version UID.
     */
    private static final long serialVersionUID = 0L;

    /**
     * An event type indicating that the corresponding event is caused by a
     * change of the CallPeer's status.
     */
    public static final String CALL_PEER_STATE_CHANGE =
                                                "CallPeerStatusChange";

    /**
     * An event type indicating that the corresponding event is caused by a
     * change of the peer's display name.
     */
    public static final String CALL_PEER_DISPLAY_NAME_CHANGE =
                                             "CallPeerDisplayNameChange";

    /**
     * An event type indicating that the corresponding event is caused by a
     * change of the peer's address.
     */
    public static final String CALL_PEER_ADDRESS_CHANGE =
                                                "CallPeerAddressChange";

    /**
     * An event type indicating that the corresponding event is caused by a
     * change of the peer's address.
     */
    public static final String CALL_PEER_TRANSPORT_ADDRESS_CHANGE =
        "CallPeerAddressChange";

    /**
     * An event type indicating that the corresponding event is caused by a
     * change of the peer's photo/picture.
     */
    public static final String CALL_PEER_IMAGE_CHANGE =
                                                   "CallPeerImageChange";

    /**
     * A reason string further explaining the event (may be null). The string
     * would be mostly used for events issued upon a CallPeerState
     * transition that has led to a FAILED state.
     */
    private final String reason;

    /**
     * Reason code, if any, for the peer state change.
     */
    private final int reasonCode;

    /**
     * Code indicating normal call clear.
     */
    public static final int NORMAL_CALL_CLEARING = 200;

    /**
     * Creates a CallPeerChangeEvent with the specified source, type,
     * oldValue and newValue.
     * @param source the peer that produced the event.
     * @param type the type of the event (i.e. address change, state change etc.).
     * @param oldValue the value of the changed property before the event occurred
     * @param newValue current value of the changed property.
     */
    public CallPeerChangeEvent(CallPeer source,
                                      String type,
                                      Object oldValue,
                                      Object newValue)
    {
        this(source, type, oldValue, newValue, null);
    }

    /**
     * Creates a CallPeerChangeEvent with the specified source, type,
     * oldValue and newValue.
     * @param source the peer that produced the event.
     * @param type the type of the event (i.e. address change, state change etc.).
     * @param oldValue the value of the changed property before the event occurred
     * @param newValue current value of the changed property.
     * @param reason a string containing a human readable explanation for the
     * reason that triggerred this event (may be null).
     */
    public CallPeerChangeEvent(CallPeer source,
                                      String type,
                                      Object oldValue,
                                      Object newValue,
                                      String reason)
    {
        this(source, type, oldValue, newValue, reason, -1);
    }

    /**
     * Creates a CallPeerChangeEvent with the specified source, type,
     * oldValue and newValue.
     * @param source the peer that produced the event.
     * @param type the type of the event (i.e. address change, state change etc.).
     * @param oldValue the value of the changed property before the event occurred
     * @param newValue current value of the changed property.
     * @param reason a string containing a human readable explanation for the
     * reason that triggered this event (may be null).
     * @param reasonCode a code for the reason that triggered this
     * event (may be -1 as not specified).
     */
    public CallPeerChangeEvent(CallPeer source,
                                      String type,
                                      Object oldValue,
                                      Object newValue,
                                      String reason,
                                      int reasonCode)
    {
        super(source, type, oldValue, newValue);
        this.reason = reason;
        this.reasonCode = reasonCode;
    }

    /**
     * Returns the type of this event.
     * @return a string containing one of the following values:
     *  CALL_PEER_STATUS_CHANGE, CALL_PEER_DISPLAY_NAME_CHANGE,
     *  CALL_PEER_ADDRESS_CHANGE, CALL_PEER_IMAGE_CHANGE
     */
    public String getEventType()
    {
        return getPropertyName();
    }

    /**
     * Returns a String representation of this CallPeerChangeEvent.
     *
     * @return  A a String representation of this CallPeerChangeEvent.
     */
    @Override
    public String toString()
    {

        return "CallPeerChangeEvent: type="+getEventType()
            + " oldV="+getOldValue()
            + " newV="+getNewValue()
            + " for peer=" + getSourceCallPeer();
    }

    /**
     * Returns the <tt>CallPeer</tt> that this event is about.
     *
     * @return a reference to the <tt>CallPeer</tt> that is the source
     * of this event.
     */
    public CallPeer getSourceCallPeer()
    {
        return (CallPeer)getSource();
    }

    /**
     * Returns a reason string further explaining the event (may be null). The
     * string would be mostly used for events issued upon a CallPeerState
     * transition that has led to a FAILED state.
     *
     * @return a reason string further explaining the event or null if no reason
     * was set.
     */
    public String getReasonString()
    {
        return reason;
    }

    /**
     * Returns a reason code for the event (may be -1).
     *
     * @return a reason code for the event or -1 if no reason code
     * was set.
     */
    public int getReasonCode()
    {
        return reasonCode;
    }
}