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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * Copyright 2019, Mobius Software LTD 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.
 */

/*
 * The Java Call Control API for CAMEL 2
 *
 * The source code contained in this file is in in the public domain.
 * It can be used in any project or product without prior permission,
 * license or royalty payments. There is  NO WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR STATUTORY, INCLUDING, WITHOUT LIMITATION,
 * THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
 * AND DATA ACCURACY.  We do not warrant or make any representations
 * regarding the use of the software or the  results thereof, including
 * but not limited to the correctness, accuracy, reliability or
 * usefulness of the software.
 */

package org.restcomm.protocols.ss7.sccp.impl.parameter;

import io.netty.buffer.ByteBuf;

import org.restcomm.protocols.ss7.sccp.SccpProtocolVersion;
import org.restcomm.protocols.ss7.sccp.message.ParseException;
import org.restcomm.protocols.ss7.sccp.parameter.ParameterFactory;
import org.restcomm.protocols.ss7.sccp.parameter.ProtocolClass;

/**
 * @author Oleg Kulikov
 * @author yulianoifa
 */
public class ProtocolClassImpl extends AbstractParameter implements ProtocolClass {
	private static final long serialVersionUID = 1L;

	private int pClass;
    private int msgHandling;

    /** Creates a new instance of UnitDataMandatotyFixedPart */
    public ProtocolClassImpl() {
    }

    public ProtocolClassImpl(int pClass) {
        if (pClass != 2 && pClass != 3) {
            throw new IllegalStateException("This constructor is only for protocol class 2 or 3");
        }
        this.pClass = pClass;
    }

    public ProtocolClassImpl(int pClass, boolean returnMessageOnError) {
        this.pClass = pClass;
        if (pClass == 0 || pClass == 1)
            this.msgHandling = (returnMessageOnError ? HANDLING_RET_ERR : 0);
        else
            this.msgHandling = 0;
    }

    public int getProtocolClass() {
        return this.pClass;
    }

    public boolean getReturnMessageOnError() {
        if (pClass != 0 && pClass != 1) {
            throw new IllegalArgumentException("Protocol class 0 or 1 is required");
        }
        return (this.msgHandling & HANDLING_RET_ERR) != 0 ? true : false;
    }

    public void clearReturnMessageOnError() {
        if (pClass != 0 && pClass != 1) {
            throw new IllegalArgumentException("Protocol class 0 or 1 is required");
        }
        int mask = HANDLING_RET_ERR ^ (-1);
        this.msgHandling = this.msgHandling & mask;
    }

    @Override
    public void decode(ByteBuf buffer, final ParameterFactory factory, final SccpProtocolVersion sccpProtocolVersion) throws ParseException {
        int b = buffer.readByte() & 0xff;

        pClass = b & 0x0f;
        msgHandling = (b & 0xf0) >> 4;
    }

    @Override
    public void encode(ByteBuf buffer,final boolean removeSpc, final SccpProtocolVersion sccpProtocolVersion) throws ParseException {
    	buffer.writeByte((byte) (pClass | (msgHandling << 4)));
    }

    public int hashCode() {
        final int prime = 31;
        int result = super.hashCode();
        result = prime * result + msgHandling;
        result = prime * result + pClass;
        return result;
    }

    public boolean equals(Object obj) {
        if (this == obj)
            return true;

        if (getClass() != obj.getClass())
            return false;
        ProtocolClassImpl other = (ProtocolClassImpl) obj;
        if (msgHandling != other.msgHandling)
            return false;
        if (pClass != other.pClass)
            return false;
        return true;
    }

    public String toString() {
        return "ProtocolClass [msgHandling=" + msgHandling + ", pClass=" + pClass + "]";
    }
}