package org.bouncycastle.asn1.ocsp;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.X509Extensions;

public class TBSRequest
    extends ASN1Encodable
{
	DERInteger		version;
	GeneralName		requestorName;
	ASN1Sequence	requestList;
	X509Extensions	requestExtensions;

	public TBSRequest(
        GeneralName		requestorName,
        ASN1Sequence	requestList,
        X509Extensions	requestExtensions)
    {
        this.version = new DERInteger(0);
        this.requestorName = requestorName;
        this.requestList = requestList;
        this.requestExtensions = requestExtensions;
    }

	public TBSRequest(
		ASN1Sequence	seq)
	{
		int	index = 0;

        if (seq.getObjectAt(0) instanceof ASN1TaggedObject)
        {
            ASN1TaggedObject    o = (ASN1TaggedObject)seq.getObjectAt(0);

            if (o.getTagNo() == 0)
            {
                version = DERInteger.getInstance((ASN1TaggedObject)seq.getObjectAt(0), true);
                index++;
            }
            else
            {
                version = new DERInteger(0);
            }
        }

		if (seq.getObjectAt(index) instanceof ASN1TaggedObject)
		{
			requestorName = GeneralName.getInstance((ASN1TaggedObject)seq.getObjectAt(index++), true);
		}
		requestList = (ASN1Sequence)seq.getObjectAt(index++);

		if (seq.size() == (index + 1))
		{
			requestExtensions = X509Extensions.getInstance((ASN1TaggedObject)seq.getObjectAt(index), true);
		}
	}

    public static TBSRequest getInstance(
        ASN1TaggedObject obj,
        boolean          explicit)
    {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static TBSRequest getInstance(
        Object  obj)
    {
        if (obj == null || obj instanceof TBSRequest)
        {
            return (TBSRequest)obj;
        }
        else if (obj instanceof ASN1Sequence)
        {
            return new TBSRequest((ASN1Sequence)obj);
        }

        throw new IllegalArgumentException("unknown object in factory");
    }

	public DERInteger getVersion()
	{
		return version;
	}

	public GeneralName getRequestorName()
	{
		return requestorName;
	}

	public ASN1Sequence getRequestList()
	{
		return requestList;
	}

	public X509Extensions getRequestExtensions()
	{
		return requestExtensions;
	}

	/**
     * Produce an object suitable for an ASN1OutputStream.
	 * <pre>
	 * TBSRequest      ::=     SEQUENCE {
	 *     version             [0]     EXPLICIT Version DEFAULT v1,
	 *     requestorName       [1]     EXPLICIT GeneralName OPTIONAL,
	 *     requestList                 SEQUENCE OF Request,
	 *     requestExtensions   [2]     EXPLICIT Extensions OPTIONAL }
	 * </pre>
	 */
	public DERObject toASN1Object()
	{
		ASN1EncodableVector	v = new ASN1EncodableVector();

		//
		// if default don't include.
		//
		if (version.getValue().intValue() != 0)
		{
			v.add(new DERTaggedObject(true, 0, version));
		}
		
        if (requestorName != null)
        {
            v.add(new DERTaggedObject(true, 1, requestorName));
        }

		v.add(requestList);

        if (requestExtensions != null)
        {
            v.add(new DERTaggedObject(true, 2, requestExtensions));
        }

		return new DERSequence(v);
	}
}
