var (
	ErrChunk                         = errors.New("abort chunk, with following errors")
	ErrShutdownNonEstablished        = errors.New("shutdown called in non-established state")
	ErrAssociationClosedBeforeConn   = errors.New("association closed before connecting")
	ErrAssociationClosed             = errors.New("association closed")
	ErrSilentlyDiscard               = errors.New("silently discard")
	ErrInitNotStoredToSend           = errors.New("the init not stored to send")
	ErrCookieEchoNotStoredToSend     = errors.New("cookieEcho not stored to send")
	ErrSCTPPacketSourcePortZero      = errors.New("sctp packet must not have a source port of 0")
	ErrSCTPPacketDestinationPortZero = errors.New("sctp packet must not have a destination port of 0")
	ErrInitChunkBundled              = errors.New("init chunk must not be bundled with any other chunk")
	ErrInitChunkVerifyTagNotZero     = errors.New(
		"init chunk expects a verification tag of 0 on the packet when out-of-the-blue",
	)
	ErrHandleInitState            = errors.New("todo: handle Init when in state")
	ErrInitAckNoCookie            = errors.New("no cookie in InitAck")
	ErrInflightQueueTSNPop        = errors.New("unable to be popped from inflight queue TSN")
	ErrTSNRequestNotExist         = errors.New("requested non-existent TSN")
	ErrResetPacketInStateNotExist = errors.New("sending reset packet in non-established state")
	ErrParamterType               = errors.New("unexpected parameter type")
	ErrPayloadDataStateNotExist   = errors.New("sending payload data in non-established state")
	ErrChunkTypeUnhandled         = errors.New("unhandled chunk type")
	ErrHandshakeInitAck           = errors.New("handshake failed (INIT ACK)")
	ErrHandshakeCookieEcho        = errors.New("handshake failed (COOKIE ECHO)")
	ErrTooManyReconfigRequests    = errors.New("too many outstanding reconfig requests")
)

var (
	ErrChunkTypeNotAbort     = errors.New("ChunkType is not of type ABORT")
	ErrBuildAbortChunkFailed = errors.New("failed build Abort Chunk")
)

var (
	ErrChunkTypeNotCtError   = errors.New("ChunkType is not of type ctError")
	ErrBuildErrorChunkFailed = errors.New("failed build Error Chunk")
)

var (
	ErrMarshalStreamFailed = errors.New("failed to marshal stream")
	ErrChunkTooShort       = errors.New("chunk too short")
)

var (
	ErrChunkTypeNotHeartbeat      = errors.New("ChunkType is not of type HEARTBEAT")
	ErrHeartbeatNotLongEnoughInfo = errors.New("heartbeat is not long enough to contain Heartbeat Info")
	ErrParseParamTypeFailed       = errors.New("failed to parse param type")
	ErrHeartbeatParam             = errors.New("heartbeat should only have HEARTBEAT param")
	ErrHeartbeatChunkUnmarshal    = errors.New("failed unmarshalling param in Heartbeat Chunk")
	ErrHeartbeatExtraNonZero      = errors.New("heartbeat has non-zero trailing bytes after last parameter")
	ErrHeartbeatMarshalNoInfo     = errors.New("heartbeat marshal requires exactly one Heartbeat Info parameter")
)

var (
	// Deprecated: this error is no longer used but is kept for compatibility.
	ErrUnimplemented                = errors.New("unimplemented")
	ErrChunkTypeNotHeartbeatAck     = errors.New("chunk type is not of type HEARTBEAT ACK")
	ErrHeartbeatAckParams           = errors.New("heartbeat Ack must have one param")
	ErrHeartbeatAckNotHeartbeatInfo = errors.New("heartbeat Ack must have one param, and it should be a HeartbeatInfo")
	ErrHeartbeatAckMarshalParam     = errors.New("unable to marshal parameter for Heartbeat Ack")
)

var (
	ErrChunkTypeNotTypeInit          = errors.New("ChunkType is not of type INIT")
	ErrChunkValueNotLongEnough       = errors.New("chunk Value isn't long enough for mandatory parameters exp")
	ErrChunkTypeInitFlagZero         = errors.New("ChunkType of type INIT flags must be all 0")
	ErrChunkTypeInitUnmarshalFailed  = errors.New("failed to unmarshal INIT body")
	ErrChunkTypeInitMarshalFailed    = errors.New("failed marshaling INIT common data")
	ErrChunkTypeInitInitateTagZero   = errors.New("ChunkType of type INIT ACK InitiateTag must not be 0")
	ErrInitInboundStreamRequestZero  = errors.New("INIT ACK inbound stream request must be > 0")
	ErrInitOutboundStreamRequestZero = errors.New("INIT ACK outbound stream request must be > 0")
	ErrInitAdvertisedReceiver1500    = errors.New("INIT ACK Advertised Receiver Window Credit (a_rwnd) must be >= 1500")
	ErrInitUnknownParam              = errors.New("INIT with unknown param")
)

var (
	ErrChunkTypeNotInitAck              = errors.New("ChunkType is not of type INIT ACK")
	ErrChunkNotLongEnoughForParams      = errors.New("chunk Value isn't long enough for mandatory parameters exp")
	ErrChunkTypeInitAckFlagZero         = errors.New("ChunkType of type INIT ACK flags must be all 0")
	ErrInitAckUnmarshalFailed           = errors.New("failed to unmarshal INIT body")
	ErrInitCommonDataMarshalFailed      = errors.New("failed marshaling INIT common data")
	ErrChunkTypeInitAckInitateTagZero   = errors.New("ChunkType of type INIT ACK InitiateTag must not be 0")
	ErrInitAckInboundStreamRequestZero  = errors.New("INIT ACK inbound stream request must be > 0")
	ErrInitAckOutboundStreamRequestZero = errors.New("INIT ACK outbound stream request must be > 0")
	ErrInitAckAdvertisedReceiver1500    = errors.New("INIT ACK Advertised Receiver Window Credit (a_rwnd) must be >= 1500")
)

var (
	ErrInitChunkParseParamTypeFailed = errors.New("failed to parse param type")
	ErrInitAckMarshalParam           = errors.New("unable to marshal parameter for INIT/INITACK")
)

var (
	ErrChunkParseParamTypeFailed        = errors.New("failed to parse param type")
	ErrChunkMarshalParamAReconfigFailed = errors.New("unable to marshal parameter A for reconfig")
	ErrChunkMarshalParamBReconfigFailed = errors.New("unable to marshal parameter B for reconfig")
)

var (
	ErrChunkTypeNotSack           = errors.New("ChunkType is not of type SACK")
	ErrSackSizeNotLargeEnoughInfo = errors.New("SACK Chunk size is not large enough to contain header")
	ErrSackSizeNotMatchPredicted  = errors.New("SACK Chunk size does not match predicted amount from header values")
)

var (
	ErrInvalidChunkSize     = errors.New("invalid chunk size")
	ErrChunkTypeNotShutdown = errors.New("ChunkType is not of type SHUTDOWN")
)

var (
	ErrChunkHeaderTooSmall       = errors.New("raw is too small for a SCTP chunk")
	ErrChunkHeaderNotEnoughSpace = errors.New("not enough data left in SCTP packet to satisfy requested length")
	ErrChunkHeaderPaddingNonZero = errors.New("chunk padding is non-zero at offset")
)

var (
	ErrPacketRawTooSmall           = errors.New("raw is smaller than the minimum length for a SCTP packet")
	ErrParseSCTPChunkNotEnoughData = errors.New("unable to parse SCTP chunk, not enough data for complete header")
	ErrUnmarshalUnknownChunkType   = errors.New("failed to unmarshal, contains unknown chunk type")
	ErrChecksumMismatch            = errors.New("checksum mismatch theirs")
)

var (
	ErrParamHeaderTooShort                  = errors.New("param header too short")
	ErrParamHeaderSelfReportedLengthShorter = errors.New("param self reported length is shorter than header length")
	ErrParamHeaderSelfReportedLengthLonger  = errors.New("param self reported length is longer than header length")
	ErrParamHeaderParseFailed               = errors.New("failed to parse param type")
)

var (
	ErrUnexpectedChunkPoppedUnordered = errors.New("unexpected chunk popped (unordered)")
	ErrUnexpectedChunkPoppedOrdered   = errors.New("unexpected chunk popped (ordered)")
	ErrUnexpectedQState               = errors.New("unexpected q state (should've been selected)")

	// Deprecated: use ErrUnexpectedChunkPoppedUnordered.
	ErrUnexpectedChuckPoppedUnordered = ErrUnexpectedChunkPoppedUnordered
	// Deprecated: use ErrUnexpectedChunkPoppedOrdered.
	ErrUnexpectedChuckPoppedOrdered = ErrUnexpectedChunkPoppedOrdered
)

var (
	ErrOutboundPacketTooLarge = errors.New("outbound packet larger than maximum message size")
	ErrStreamClosed           = errors.New("stream closed")
	ErrReadDeadlineExceeded   = fmt.Errorf("read deadline exceeded: %w", os.ErrDeadlineExceeded)
)

var (
	ErrBuildErrorCaseHandle = errors.New("BuildErrorCause does not handle")
)

var (
	ErrChunkPayloadSmall = errors.New("packet is smaller than the header size")
)

var (
	ErrChunkTypeNotCookieAck = errors.New("ChunkType is not of type COOKIEACK")
)

var (
	ErrChunkTypeNotCookieEcho = errors.New("ChunkType is not of type COOKIEECHO")
)

var (
	ErrChunkTypeNotShutdownAck = errors.New("ChunkType is not of type SHUTDOWN-ACK")
)

var (
	ErrChunkTypeNotShutdownComplete = errors.New("ChunkType is not of type SHUTDOWN-COMPLETE")
)

var ErrInvalidAlgorithmType = errors.New("invalid algorithm type")

var ErrInvalidChunkLength = errors.New("invalid chunk length")

var ErrInvalidSCTPChunk = errors.New("invalid SCTP chunk")

var (
	ErrParamPacketTooShort = errors.New("packet too short")
)

var ErrParamTypeUnhandled = errors.New("unhandled ParamType")

var (
	ErrProtocolViolationUnmarshal = errors.New("unable to unmarshal Protocol Violation error")
)

var (
	ErrReconfigRespParamTooShort = errors.New("reconfig response parameter too short")
)

var (
	ErrSSNResetRequestParamTooShort = errors.New("outgoing SSN reset request parameter too short")
)

var (
	ErrZeroChecksumParamTooShort = errors.New("zero checksum parameter too short")
)