using System;
using System.IO;

namespace ProtoCSStruct
{
    /// <summary>
    /// Thrown when a protocol message being parsed is invalid in some way,
    /// e.g. it contains a malformed varint or a negative byte length.
    /// </summary>
    public sealed class InvalidProtocolBufferException : IOException
    {
        public InvalidProtocolBufferException(string message)
            : base(message)
        {
        }

        public InvalidProtocolBufferException(string message, Exception innerException)
            : base(message, innerException)
        {
        }

        public static InvalidProtocolBufferException MoreDataAvailable()
        {
            return new InvalidProtocolBufferException(
                "Completed reading a message while more data was available in the stream.");
        }

        public static InvalidProtocolBufferException TruncatedMessage()
        {
            return new InvalidProtocolBufferException(
                "While parsing a protocol message, the input ended unexpectedly " +
                "in the middle of a field.  This could mean either than the " +
                "input has been truncated or that an embedded message " +
                "misreported its own length.");
        }

        public static InvalidProtocolBufferException NegativeSize()
        {
            return new InvalidProtocolBufferException(
                "CodedInputStream encountered an embedded string or message " +
                "which claimed to have negative size.");
        }

        public static InvalidProtocolBufferException MalformedVarint()
        {
            return new InvalidProtocolBufferException(
                "CodedInputStream encountered a malformed varint.");
        }

        /// <summary>
        /// Creates an exception for an error condition of an invalid tag being encountered.
        /// </summary>
        public static InvalidProtocolBufferException InvalidTag()
        {
            return new InvalidProtocolBufferException(
                "Protocol message contained an invalid tag (zero).");
        }

        public static InvalidProtocolBufferException InvalidBase64(Exception innerException)
        {
            return new InvalidProtocolBufferException("Invalid base64 data", innerException);
        }

        public static InvalidProtocolBufferException InvalidEndTag()
        {
            return new InvalidProtocolBufferException(
                "Protocol message end-group tag did not match expected tag.");
        }

        public static InvalidProtocolBufferException RecursionLimitExceeded()
        {
            return new InvalidProtocolBufferException(
                "Protocol message had too many levels of nesting.  May be malicious.  " +
                "Use CodedInputStream.SetRecursionLimit() to increase the depth limit.");
        }

        public static InvalidProtocolBufferException JsonRecursionLimitExceeded()
        {
            return new InvalidProtocolBufferException(
                "Protocol message had too many levels of nesting.  May be malicious.  " +
                "Use JsonParser.Settings to increase the depth limit.");
        }

        public static InvalidProtocolBufferException SizeLimitExceeded()
        {
            return new InvalidProtocolBufferException(
                "Protocol message was too large.  May be malicious.  " +
                "Use CodedInputStream.SetSizeLimit() to increase the size limit.");
        }

        public static InvalidProtocolBufferException InvalidMessageStreamTag()
        {
            return new InvalidProtocolBufferException(
                "Stream of protocol messages had invalid tag. Expected tag is length-delimited field 1.");
        }

        public static InvalidProtocolBufferException StringLengthToLong()
        {
            return new InvalidProtocolBufferException(
                "protocol messages StringLengthToLong.");
        }
    }
}