using System;

using Org.BouncyCastle.Asn1.Crmf;
using Org.BouncyCastle.Asn1.Pkcs;

namespace Org.BouncyCastle.Asn1.Cmp
{
    /**
     * PKIBody ::= CHOICE {       -- message-specific body elements
     *          ir       [0]  CertReqMessages,        --Initialization Request
     *          ip       [1]  CertRepMessage,         --Initialization Response
     *          cr       [2]  CertReqMessages,        --Certification Request
     *          cp       [3]  CertRepMessage,         --Certification Response
     *          p10cr    [4]  CertificationRequest,   --imported from [PKCS10]
     *          popdecc  [5]  POPODecKeyChallContent, --pop Challenge
     *          popdecr  [6]  POPODecKeyRespContent,  --pop Response
     *          kur      [7]  CertReqMessages,        --Key Update Request
     *          kup      [8]  CertRepMessage,         --Key Update Response
     *          krr      [9]  CertReqMessages,        --Key Recovery Request
     *          krp      [10] KeyRecRepContent,       --Key Recovery Response
     *          rr       [11] RevReqContent,          --Revocation Request
     *          rp       [12] RevRepContent,          --Revocation Response
     *          ccr      [13] CertReqMessages,        --Cross-Cert. Request
     *          ccp      [14] CertRepMessage,         --Cross-Cert. Response
     *          ckuann   [15] CAKeyUpdAnnContent,     --CA Key Update Ann.
     *          cann     [16] CertAnnContent,         --Certificate Ann.
     *          rann     [17] RevAnnContent,          --Revocation Ann.
     *          crlann   [18] CRLAnnContent,          --CRL Announcement
     *          pkiconf  [19] PKIConfirmContent,      --Confirmation
     *          nested   [20] NestedMessageContent,   --Nested Message
     *          genm     [21] GenMsgContent,          --General Message
     *          genp     [22] GenRepContent,          --General Response
     *          error    [23] ErrorMsgContent,        --Error Message
     *          certConf [24] CertConfirmContent,     --Certificate confirm
     *          pollReq  [25] PollReqContent,         --Polling request
     *          pollRep  [26] PollRepContent          --Polling response
     *      }
     */
    public class PkiBody
        : Asn1Encodable, IAsn1Choice
    {
        public const int TYPE_INIT_REQ = 0;
        public const int TYPE_INIT_REP = 1;
        public const int TYPE_CERT_REQ = 2;
        public const int TYPE_CERT_REP = 3;
        public const int TYPE_P10_CERT_REQ = 4;
        public const int TYPE_POPO_CHALL = 5;
        public const int TYPE_POPO_REP = 6;
        public const int TYPE_KEY_UPDATE_REQ = 7;
        public const int TYPE_KEY_UPDATE_REP = 8;
        public const int TYPE_KEY_RECOVERY_REQ = 9;
        public const int TYPE_KEY_RECOVERY_REP = 10;
        public const int TYPE_REVOCATION_REQ = 11;
        public const int TYPE_REVOCATION_REP = 12;
        public const int TYPE_CROSS_CERT_REQ = 13;
        public const int TYPE_CROSS_CERT_REP = 14;
        public const int TYPE_CA_KEY_UPDATE_ANN = 15;
        public const int TYPE_CERT_ANN = 16;
        public const int TYPE_REVOCATION_ANN = 17;
        public const int TYPE_CRL_ANN = 18;
        public const int TYPE_CONFIRM = 19;
        public const int TYPE_NESTED = 20;
        public const int TYPE_GEN_MSG = 21;
        public const int TYPE_GEN_REP = 22;
        public const int TYPE_ERROR = 23;
        public const int TYPE_CERT_CONFIRM = 24;
        public const int TYPE_POLL_REQ = 25;
        public const int TYPE_POLL_REP = 26;

        public static PkiBody GetInstance(object obj)
        {
            if (obj == null)
                return null;
            if (obj is PkiBody crlSource)
                return crlSource;
            return new PkiBody(Asn1TaggedObject.GetInstance(obj));
        }

        public static PkiBody GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
        {
            return Asn1Utilities.GetInstanceFromChoice(taggedObject, declaredExplicit, GetInstance);
        }

        private readonly int m_tagNo;
        private readonly Asn1Encodable m_body;

        private PkiBody(Asn1TaggedObject taggedObject)
        {
            m_tagNo = taggedObject.TagNo;
            m_body = GetBodyForType(m_tagNo, taggedObject.GetExplicitBaseObject());
        }

        /**
         * Creates a new PkiBody.
         * @param type one of the TYPE_* constants
         * @param content message content
         */
        public PkiBody(int type, Asn1Encodable content)
        {
            m_tagNo = type;
            m_body = GetBodyForType(type, content);
        }

        private static Asn1Encodable GetBodyForType(int type, Asn1Encodable o)
        {
            switch (type)
            {
            case TYPE_INIT_REQ:
                return CertReqMessages.GetInstance(o);
            case TYPE_INIT_REP:
                return CertRepMessage.GetInstance(o);
            case TYPE_CERT_REQ:
                return CertReqMessages.GetInstance(o);
            case TYPE_CERT_REP:
                return CertRepMessage.GetInstance(o);
            case TYPE_P10_CERT_REQ:
                return CertificationRequest.GetInstance(o);
            case TYPE_POPO_CHALL:
                return PopoDecKeyChallContent.GetInstance(o);
            case TYPE_POPO_REP:
                return PopoDecKeyRespContent.GetInstance(o);
            case TYPE_KEY_UPDATE_REQ:
                return CertReqMessages.GetInstance(o);
            case TYPE_KEY_UPDATE_REP:
                return CertRepMessage.GetInstance(o);
            case TYPE_KEY_RECOVERY_REQ:
                return CertReqMessages.GetInstance(o);
            case TYPE_KEY_RECOVERY_REP:
                return KeyRecRepContent.GetInstance(o);
            case TYPE_REVOCATION_REQ:
                return RevReqContent.GetInstance(o);
            case TYPE_REVOCATION_REP:
                return RevRepContent.GetInstance(o);
            case TYPE_CROSS_CERT_REQ:
                return CertReqMessages.GetInstance(o);
            case TYPE_CROSS_CERT_REP:
                return CertRepMessage.GetInstance(o);
            case TYPE_CA_KEY_UPDATE_ANN:
                return CAKeyUpdAnnContent.GetInstance(o);
            case TYPE_CERT_ANN:
                return CmpCertificate.GetInstance(o);
            case TYPE_REVOCATION_ANN:
                return RevAnnContent.GetInstance(o);
            case TYPE_CRL_ANN:
                return CrlAnnContent.GetInstance(o);
            case TYPE_CONFIRM:
                return PkiConfirmContent.GetInstance(o);
            case TYPE_NESTED:
                return PkiMessages.GetInstance(o);
            case TYPE_GEN_MSG:
                return GenMsgContent.GetInstance(o);
            case TYPE_GEN_REP:
                return GenRepContent.GetInstance(o);
            case TYPE_ERROR:
                return ErrorMsgContent.GetInstance(o);
            case TYPE_CERT_CONFIRM:
                return CertConfirmContent.GetInstance(o);
            case TYPE_POLL_REQ:
                return PollReqContent.GetInstance(o);
            case TYPE_POLL_REP:
                return PollRepContent.GetInstance(o);
            default:
	            throw new ArgumentException("unknown tag number: " + type, nameof(type));
            }
        }

        public virtual Asn1Encodable Content => m_body;

        public virtual int Type => m_tagNo;

        /**
         * <pre>
         * PkiBody ::= CHOICE {       -- message-specific body elements
         *        ir       [0]  CertReqMessages,        --Initialization Request
         *        ip       [1]  CertRepMessage,         --Initialization Response
         *        cr       [2]  CertReqMessages,        --Certification Request
         *        cp       [3]  CertRepMessage,         --Certification Response
         *        p10cr    [4]  CertificationRequest,   --imported from [PKCS10]
         *        popdecc  [5]  POPODecKeyChallContent, --pop Challenge
         *        popdecr  [6]  POPODecKeyRespContent,  --pop Response
         *        kur      [7]  CertReqMessages,        --Key Update Request
         *        kup      [8]  CertRepMessage,         --Key Update Response
         *        krr      [9]  CertReqMessages,        --Key Recovery Request
         *        krp      [10] KeyRecRepContent,       --Key Recovery Response
         *        rr       [11] RevReqContent,          --Revocation Request
         *        rp       [12] RevRepContent,          --Revocation Response
         *        ccr      [13] CertReqMessages,        --Cross-Cert. Request
         *        ccp      [14] CertRepMessage,         --Cross-Cert. Response
         *        ckuann   [15] CAKeyUpdAnnContent,     --CA Key Update Ann.
         *        cann     [16] CertAnnContent,         --Certificate Ann.
         *        rann     [17] RevAnnContent,          --Revocation Ann.
         *        crlann   [18] CRLAnnContent,          --CRL Announcement
         *        pkiconf  [19] PKIConfirmContent,      --Confirmation
         *        nested   [20] NestedMessageContent,   --Nested Message
         *        genm     [21] GenMsgContent,          --General Message
         *        genp     [22] GenRepContent,          --General Response
         *        error    [23] ErrorMsgContent,        --Error Message
         *        certConf [24] CertConfirmContent,     --Certificate confirm
         *        pollReq  [25] PollReqContent,         --Polling request
         *        pollRep  [26] PollRepContent          --Polling response
         * }
         * </pre>
         * @return a basic ASN.1 object representation.
         */
        public override Asn1Object ToAsn1Object() => new DerTaggedObject(true, m_tagNo, m_body);
    }
}