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/*
 * RED5 Open Source Media Server - https://github.com/Red5/ Copyright 2006-2023 by respective authors (see below). All rights reserved. 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 org.red5.compatibility.flex.messaging.messages;

import org.red5.io.amf3.ByteArray;
import org.red5.io.amf3.IDataInput;
import org.red5.io.amf3.IDataOutput;
import org.red5.io.utils.RandomGUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class for for asynchronous Flex compatibility messages.
 *
 * @author The Red5 Project
 * @author Joachim Bauch ([email protected])
 * @author Paul Gregoire ([email protected])
 */
public class AsyncMessage extends AbstractMessage {

    private static final long serialVersionUID = -3549535089417916783L;

    protected static byte CORRELATION_ID_FLAG = 1;

    protected static byte CORRELATION_ID_BYTES_FLAG = 2;

    /** Id of message this message belongs to. */
    public String correlationId;

    protected byte[] correlationIdBytes;

    /** {@inheritDoc} */
    @Override
    protected void addParameters(StringBuilder result) {
        super.addParameters(result);
        result.append(",correlationId=");
        result.append(correlationId);
    }

    public void setCorrelationId(String id) {
        correlationId = id;
    }

    public String getCorrelationId() {
        return correlationId;
    }

    static Logger log = LoggerFactory.getLogger(AsyncMessage.class);

    @Override
    public void readExternal(IDataInput in) {
        super.readExternal(in);
        short[] flagsArray = readFlags(in);
        for (int i = 0; i < flagsArray.length; ++i) {
            short flags = flagsArray[i];
            short reservedPosition = 0;
            if (i == 0) {
                if ((flags & CORRELATION_ID_FLAG) != 0) {
                    correlationId = ((String) in.readObject());
                }
                if ((flags & CORRELATION_ID_BYTES_FLAG) != 0) {
                    ByteArray ba = (ByteArray) in.readObject();
                    correlationIdBytes = new byte[ba.length()];
                    ba.readBytes(correlationIdBytes);
                    correlationId = RandomGUID.fromByteArray(correlationIdBytes);
                }
                reservedPosition = 2;
            }
            if (flags >> reservedPosition == 0) {
                continue;
            }
            for (short j = reservedPosition; j < 6; j = (short) (j + 1)) {
                if ((flags >> j & 0x1) == 0) {
                    continue;
                }
                in.readObject();
            }
        }
    }

    @Override
    public void writeExternal(IDataOutput output) {
        super.writeExternal(output);
        if (this.correlationIdBytes == null) {
            this.correlationIdBytes = RandomGUID.toByteArray(this.correlationId);
        }
        short flags = 0;
        if ((this.correlationId != null) && (this.correlationIdBytes == null)) {
            flags = (short) (flags | CORRELATION_ID_FLAG);
        }
        if (this.correlationIdBytes != null) {
            flags = (short) (flags | CORRELATION_ID_BYTES_FLAG);
        }
        output.writeByte((byte) flags);
        if ((this.correlationId != null) && (this.correlationIdBytes == null)) {
            output.writeObject(this.correlationId);
        }
        if (this.correlationIdBytes != null) {
            output.writeObject(this.correlationIdBytes);
        }
    }

}