/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, 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.
 */

package org.mobicents.protocols.ss7.map.dialog;

import java.io.IOException;

import org.mobicents.protocols.asn.AsnException;
import org.mobicents.protocols.asn.AsnInputStream;
import org.mobicents.protocols.asn.AsnOutputStream;
import org.mobicents.protocols.asn.Tag;
import org.mobicents.protocols.ss7.map.api.MAPException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentExceptionReason;
import org.mobicents.protocols.ss7.map.api.primitives.AddressString;
import org.mobicents.protocols.ss7.map.api.primitives.IMSI;
import org.mobicents.protocols.ss7.map.api.primitives.MAPExtensionContainer;
import org.mobicents.protocols.ss7.map.primitives.AddressStringImpl;
import org.mobicents.protocols.ss7.map.primitives.IMSIImpl;
import org.mobicents.protocols.ss7.map.primitives.MAPAsnPrimitive;
import org.mobicents.protocols.ss7.map.primitives.MAPExtensionContainerImpl;

/**
 * Below is Ericsson MAP-OpenInfo
 * 
 * MAP−OpenInfo ::= SEQUENCE (
 *		imsi					(0)	IMSI OPTIONAL,
 *		originationReference 	(1)	AddressString OPTIONAL,
 *		msisdn					(2)	AddressString,
 *		...
 *		vlrNo					(3)	AddressString OPTIONAL
 *	)
 * 
 * @author amit bhayani
 * @author sergey vetyutnev
 * 
 */
public class MAPOpenInfoImpl implements MAPAsnPrimitive {

	public static final int MAP_OPEN_INFO_TAG = 0x00;

	protected static final int DESTINATION_REF_TAG = 0x00;
	protected static final int ORIGINATION_REF_TAG = 0x01;
	protected static final int ERI_MSISDN_TAG = 0x02;
	protected static final int ERI_NLR_NO_TAG = 0x03;

	protected static final int OPEN_INFO_TAG_CLASS = Tag.CLASS_CONTEXT_SPECIFIC;
	protected static final boolean OPEN_INFO_TAG_PC_PRIMITIVE = true;
	protected static final boolean OPEN_INFO_TAG_PC_CONSTRUCTED = false;

	private AddressString destReference;
	private AddressString origReference;
	private MAPExtensionContainer extensionContainer;

	private boolean eriStyle;
	private IMSI eriImsi;
	private AddressString eriVlrNo;

	public AddressString getDestReference() {
		return this.destReference;
	}

	public AddressString getOrigReference() {
		return this.origReference;
	}

	public MAPExtensionContainer getExtensionContainer() {
		return extensionContainer;
	}

	public boolean getEriStyle() {
		return this.eriStyle;
	}

	public IMSI getEriImsi() {
		return eriImsi;
	}

	public AddressString getEriVlrNo() {
		return eriVlrNo;
	}

	public void setDestReference(AddressString destReference) {
		this.destReference = destReference;
	}

	public void setOrigReference(AddressString origReference) {
		this.origReference = origReference;
	}

	public void setExtensionContainer(MAPExtensionContainer extensionContainer) {
		this.extensionContainer = extensionContainer;
	}

	public void setEriStyle(boolean eriStyle) {
		this.eriStyle = eriStyle;
	}

	public void setEriImsi(IMSI eriImsi) {
		this.eriImsi = eriImsi;
	}

	public void setEriVlrNo(AddressString eriVlrNo) {
		this.eriVlrNo = eriVlrNo;
	}

	
	@Override
	public int getTag() throws MAPException {
		return MAP_OPEN_INFO_TAG;
	}

	@Override
	public int getTagClass() {
		return Tag.CLASS_CONTEXT_SPECIFIC;
	}

	@Override
	public boolean getIsPrimitive() {
		return false;
	}

	@Override
	public void decodeAll(AsnInputStream ansIS) throws MAPParsingComponentException {

		try {
			int length = ansIS.readLength();
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding MAPOpenInfo: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding MAPOpenInfo: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	@Override
	public void decodeData(AsnInputStream ansIS, int length) throws MAPParsingComponentException {

		try {
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding MAPOpenInfo: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding MAPOpenInfo: " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	private void _decode(AsnInputStream ais, int length) throws MAPParsingComponentException, IOException, AsnException {

		// Definitioon from GSM 09.02 version 5.15.1 Page 690
		// map-open [0] IMPLICIT SEQUENCE {
		// destinationReference [0] IMPLICIT OCTET STRING ( SIZE( 1 .. 20 ) )
		// OPTIONAL,
		// originationReference [1] IMPLICIT OCTET STRING ( SIZE( 1 .. 20 ) )
		// OPTIONAL,
		// ... ,
		// extensionContainer SEQUENCE {
		// privateExtensionList [0] IMPLICIT SEQUENCE ( SIZE( 1 .. 10 ) ) OF
		// SEQUENCE {
		// extId MAP-EXTENSION .&extensionId ( {
		// ,
		// ...} ) ,
		// extType MAP-EXTENSION .&ExtensionType ( {
		// ,
		// ...} { @extId } ) OPTIONAL} OPTIONAL,
		// pcs-Extensions [1] IMPLICIT SEQUENCE {
		// ... } OPTIONAL,
		// ... } OPTIONAL},

		this.destReference = null;
		this.origReference = null;
		this.extensionContainer = null;
		this.eriStyle = false;
		this.eriImsi = null;
		this.eriVlrNo = null;

		AsnInputStream localAis = ais.readSequenceStreamData(length);

		// checking for Ericsson-style
		int startPos = localAis.position();
		while (localAis.available() > 0) {
			int tag = localAis.readTag();
			if (localAis.getTagClass() == Tag.CLASS_CONTEXT_SPECIFIC && tag == ERI_MSISDN_TAG) {
				this.eriStyle = true;
				break;
			}
			localAis.advanceElement();
		}

		// parsing
		localAis.position(startPos);
		while (localAis.available() > 0) {
			int tag = localAis.readTag();

			switch (localAis.getTagClass()) {
			case Tag.CLASS_CONTEXT_SPECIFIC:
				switch (tag) {
				case DESTINATION_REF_TAG:
					if (this.eriStyle) {
						this.eriImsi = new IMSIImpl();
						((IMSIImpl) this.eriImsi).decodeAll(localAis);
					} else {
						this.destReference = new AddressStringImpl();
						((AddressStringImpl) this.destReference).decodeAll(localAis);
					}
					break;

				case ORIGINATION_REF_TAG:
					this.origReference = new AddressStringImpl();
					((AddressStringImpl)this.origReference).decodeAll(localAis);
					break;

				case ERI_MSISDN_TAG:
					this.destReference = new AddressStringImpl();
					((AddressStringImpl) this.destReference).decodeAll(localAis);
					break;

				case ERI_NLR_NO_TAG:
					this.eriVlrNo = new AddressStringImpl();
					((AddressStringImpl)this.eriVlrNo).decodeAll(localAis);
					break;

				default:
					localAis.advanceElement();
					break;
				}
				break;

			case Tag.CLASS_UNIVERSAL:
				switch (tag) {
				case Tag.SEQUENCE:
					this.extensionContainer = new MAPExtensionContainerImpl();
					((MAPExtensionContainerImpl)this.extensionContainer).decodeAll(localAis);
					break;

				default:
					localAis.advanceElement();
					break;
				}
				break;

			default:
				localAis.advanceElement();
				break;
			}
		}
	}

	@Override
	public void encodeAll(AsnOutputStream asnOs) throws MAPException {

		this.encodeAll(asnOs, Tag.CLASS_CONTEXT_SPECIFIC, MAP_OPEN_INFO_TAG);
	}

	@Override
	public void encodeAll(AsnOutputStream asnOs, int tagClass, int tag) throws MAPException {
		
		try {
			asnOs.writeTag(tagClass, false, tag);
			int pos = asnOs.StartContentDefiniteLength();
			this.encodeData(asnOs);
			asnOs.FinalizeContent(pos);
		} catch (AsnException e) {
			throw new MAPException("AsnException when encoding MAPOpenInfo: " + e.getMessage(), e);
		}
	}

	@Override
	public void encodeData(AsnOutputStream asnOS) throws MAPException {

		if (this.eriStyle) {

			if (this.destReference == null)
				throw new MAPException("Error when encoding MAPOpenInf Ericsson style: destReference parameter must not be null");

			if (this.eriImsi != null)
				((IMSIImpl) this.eriImsi).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, DESTINATION_REF_TAG);
			if (this.origReference != null)
				((AddressStringImpl) this.origReference).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, ORIGINATION_REF_TAG);
			((AddressStringImpl) this.destReference).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, ERI_MSISDN_TAG);
			if (this.eriVlrNo != null)
				((AddressStringImpl) this.eriVlrNo).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, ERI_NLR_NO_TAG);
		} else {
			
			if (this.destReference != null)
				((AddressStringImpl) this.destReference).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, DESTINATION_REF_TAG);

			if (this.origReference != null)
				((AddressStringImpl) this.origReference).encodeAll(asnOS, Tag.CLASS_CONTEXT_SPECIFIC, ORIGINATION_REF_TAG);

			if (this.extensionContainer != null)
				((MAPExtensionContainerImpl) this.extensionContainer).encodeAll(asnOS);
		}
	}
}