// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
#pragma warning disable SA1028 // ignore whitespace warnings for generated code
using System;
using System.Collections.Generic;
using System.Formats.Asn1;
using System.Runtime.InteropServices;
 
namespace System.Security.Cryptography.Pkcs.Asn1
{
    [StructLayout(LayoutKind.Sequential)]
    internal partial struct CadesIssuerSerial
    {
        internal System.Security.Cryptography.Asn1.GeneralNameAsn[] Issuer;
        internal ReadOnlyMemory<byte> SerialNumber;
 
        internal readonly void Encode(AsnWriter writer)
        {
            Encode(writer, Asn1Tag.Sequence);
        }
 
        internal readonly void Encode(AsnWriter writer, Asn1Tag tag)
        {
            writer.PushSequence(tag);
 
 
            writer.PushSequence();
            for (int i = 0; i < Issuer.Length; i++)
            {
                Issuer[i].Encode(writer);
            }
            writer.PopSequence();
 
            writer.WriteInteger(SerialNumber.Span);
            writer.PopSequence(tag);
        }
 
        internal static CadesIssuerSerial Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
        {
            return Decode(Asn1Tag.Sequence, encoded, ruleSet);
        }
 
        internal static CadesIssuerSerial Decode(Asn1Tag expectedTag, ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
        {
            try
            {
                AsnValueReader reader = new AsnValueReader(encoded.Span, ruleSet);
 
                DecodeCore(ref reader, expectedTag, encoded, out CadesIssuerSerial decoded);
                reader.ThrowIfNotEmpty();
                return decoded;
            }
            catch (AsnContentException e)
            {
                throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding, e);
            }
        }
 
        internal static void Decode(ref AsnValueReader reader, ReadOnlyMemory<byte> rebind, out CadesIssuerSerial decoded)
        {
            Decode(ref reader, Asn1Tag.Sequence, rebind, out decoded);
        }
 
        internal static void Decode(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out CadesIssuerSerial decoded)
        {
            try
            {
                DecodeCore(ref reader, expectedTag, rebind, out decoded);
            }
            catch (AsnContentException e)
            {
                throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding, e);
            }
        }
 
        private static void DecodeCore(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out CadesIssuerSerial decoded)
        {
            decoded = default;
            AsnValueReader sequenceReader = reader.ReadSequence(expectedTag);
            AsnValueReader collectionReader;
            ReadOnlySpan<byte> rebindSpan = rebind.Span;
            int offset;
            ReadOnlySpan<byte> tmpSpan;
 
 
            // Decode SEQUENCE OF for Issuer
            {
                collectionReader = sequenceReader.ReadSequence();
                var tmpList = new List<System.Security.Cryptography.Asn1.GeneralNameAsn>();
                System.Security.Cryptography.Asn1.GeneralNameAsn tmpItem;
 
                while (collectionReader.HasData)
                {
                    System.Security.Cryptography.Asn1.GeneralNameAsn.Decode(ref collectionReader, rebind, out tmpItem);
                    tmpList.Add(tmpItem);
                }
 
                decoded.Issuer = tmpList.ToArray();
            }
 
            tmpSpan = sequenceReader.ReadIntegerBytes();
            decoded.SerialNumber = rebindSpan.Overlaps(tmpSpan, out offset) ? rebind.Slice(offset, tmpSpan.Length) : tmpSpan.ToArray();
 
            sequenceReader.ThrowIfNotEmpty();
        }
    }
}