/*
 * 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:17:10:53 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.CircuitStateIndicator;

/**
 * Start time:17:10:53 2009-03-30<br>
 * Project: mobicents-isup-stack<br>
 *
 * @author <a href="mailto:baranowb@gmail.com"> Bartosz Baranowski </a>
 */
public class CircuitStateIndicatorImpl extends AbstractISUPParameter implements CircuitStateIndicator {

    private byte[] circuitState = null;

    public CircuitStateIndicatorImpl(byte[] circuitState) throws ParameterException {
        super();
        this.decode(circuitState);
    }

    public CircuitStateIndicatorImpl() {
        super();

    }

    public int decode(byte[] b) throws ParameterException {
        try {
            setCircuitState(b);
        } catch (Exception e) {
            throw new ParameterException(e);
        }
        return b.length;
    }

    public byte[] encode() throws ParameterException {
        return this.circuitState;
    }

    public byte[] getCircuitState() {
        return circuitState;
    }

    public void setCircuitState(byte[] circuitState) throws IllegalArgumentException {
        if (circuitState == null || circuitState.length == 0) {
            throw new IllegalArgumentException("byte[] must nto be null and length must be greater than 0");
        }
        this.circuitState = circuitState;
    }

    public byte createCircuitState(int MBS, int CPS, int HBS) {
        int v = 0;
        // FIXME: Shoudl we here enforce proper coding? according to note or
        // move it to encode??
        if (HBS != _HBS_NO_BLOCKING) {
            // NOTE If bits F E are not coded 0 0, bits D C must be coded 1 1.
            // - this means CPS == 3
            CPS = _CPS_IDLE;
        }

        v = MBS & 0x03;
        v |= (CPS & 0x03) << 2;
        v |= (HBS & 0x03) << 4;
        return (byte) v;
    }

    public int getCallProcessingState(byte b) {
        return (b >> 2) & 0x03;
    }

    public int getHardwareBlockingState(byte b) {
        return (b >> 4) & 0x03;
    }

    public int getMaintenanceBlockingState(byte b) {
        return b & 0x03;
    }

    public int getCode() {

        return _PARAMETER_CODE;
    }

}