/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2012, Telestax Inc and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

/**
 * Start time:17:59:38 2009-03-30<br>
 * Project: mobicents-isup-stack<br>
 *
 * @author <a href="mailto:baranowb@gmail.com"> Bartosz Baranowski
 *         </a>
 *
 */
package org.mobicents.protocols.ss7.isup.impl.message.parameter;

import org.mobicents.protocols.ss7.isup.ParameterException;
import org.mobicents.protocols.ss7.isup.message.parameter.ConnectionRequest;

/**
 * Start time:17:59:38 2009-03-30<br>
 * Project: mobicents-isup-stack<br>
 *
 * @author <a href="mailto:baranowb@gmail.com"> Bartosz Baranowski </a>
 */
public class ConnectionRequestImpl extends AbstractISUPParameter implements ConnectionRequest {

    private int localReference;
    // should we use here SignalingPointCode class? XXx
    private int signalingPointCode;
    private boolean protocolClassSet = false;
    private int protocolClass;
    private boolean creditSet = false;
    private int credit;

    public ConnectionRequestImpl(byte[] b) throws ParameterException {
        decode(b);
    }

    public ConnectionRequestImpl() {
        super();

    }

    public ConnectionRequestImpl(int localReference, int signalingPointCode, int protocolClass, int credit) {
        super();
        this.localReference = localReference;
        this.signalingPointCode = signalingPointCode;
        this.protocolClass = protocolClass;
        this.credit = credit;
    }

    public int decode(byte[] b) throws ParameterException {
        if (b == null) {
            throw new ParameterException("byte[] must not be null");
        }

        // if (_PROTOCOL_VERSION == 1 && b.length != 7) {
        // throw new ParameterException("For protocol version 1 length of this parameter must be 7 octets");
        // }

        if (b.length != 5 && b.length != 7) {
            throw new ParameterException("byte[] length must be 5 or 7");
        }

        // FIXME: This is not mentioned, is it inverted as usually or not ?
        this.localReference |= b[0];
        this.localReference |= b[1] << 8;
        this.localReference |= b[2] << 16;

        this.signalingPointCode = b[3];
        this.signalingPointCode |= (b[4] & 0x3F) << 8;

        if (b.length == 7) {
            this.creditSet = true;
            this.protocolClassSet = true;
            this.protocolClass = b[5];
            this.credit = b[6];
        }
        return 0;
    }

    public byte[] encode() throws ParameterException {
        byte[] b = null;
        if (this.creditSet || this.protocolClassSet) {
            b = new byte[7];

            b[5] = (byte) this.protocolClass;
            b[6] = (byte) this.credit;
        } else {
            b = new byte[5];
        }

        b[0] = (byte) this.localReference;
        b[1] = (byte) (this.localReference >> 8);
        b[2] = (byte) (this.localReference >> 16);

        b[3] = (byte) this.signalingPointCode;
        b[4] = (byte) ((this.signalingPointCode >> 8) & 0x3F);
        return b;
    }

    public int getLocalReference() {
        return localReference;
    }

    public void setLocalReference(int localReference) {
        this.localReference = localReference;
    }

    public int getSignalingPointCode() {
        return signalingPointCode;
    }

    public void setSignalingPointCode(int signalingPointCode) {
        this.signalingPointCode = signalingPointCode;
    }

    public int getProtocolClass() {

        return protocolClass;
    }

    public void setProtocolClass(int protocolClass) {
        this.protocolClassSet = true;
        this.protocolClass = protocolClass;
    }

    public int getCredit() {
        return credit;
    }

    public void setCredit(int credit) {
        this.creditSet = true;
        this.credit = credit;
    }

    public int getCode() {

        return _PARAMETER_CODE;
    }
}