package notify

import (
	"context"
	"errors"
	"time"
)

type BulkOpenRequest struct {
	BulkID       string
	DataID       uint64
	Range        BulkRange
	Metadata     BulkMetadata
	ReadTimeout  time.Duration
	WriteTimeout time.Duration
	Dedicated    bool
	AttachToken  string
	ChunkSize    int
	WindowBytes  int
	MaxInFlight  int
}

type BulkOpenResponse struct {
	BulkID              string
	DataID              uint64
	Accepted            bool
	Dedicated           bool
	AttachToken         string
	TransportGeneration uint64
	Error               string
}

type BulkCloseRequest struct {
	BulkID string
	Full   bool
}

type BulkCloseResponse struct {
	BulkID   string
	Accepted bool
	Error    string
}

type BulkResetRequest struct {
	BulkID string
	DataID uint64
	Error  string
}

type BulkResetResponse struct {
	BulkID   string
	Accepted bool
	Error    string
}

type BulkReleaseRequest struct {
	BulkID string
	DataID uint64
	Bytes  int64
	Chunks int
}

func bindClientBulkControl(c *ClientCommon) {
	if c == nil {
		return
	}
	c.SetLink(BulkOpenSignalKey, func(msg *Message) {
		c.handleInboundBulkOpen(msg)
	})
	c.SetLink(BulkCloseSignalKey, func(msg *Message) {
		c.handleInboundBulkClose(msg)
	})
	c.SetLink(BulkResetSignalKey, func(msg *Message) {
		c.handleInboundBulkReset(msg)
	})
	c.SetLink(BulkReleaseSignalKey, func(msg *Message) {
		c.handleInboundBulkRelease(msg)
	})
}

func bindServerBulkControl(s *ServerCommon) {
	if s == nil {
		return
	}
	s.SetLink(BulkOpenSignalKey, func(msg *Message) {
		s.handleInboundBulkOpen(msg)
	})
	s.SetLink(BulkCloseSignalKey, func(msg *Message) {
		s.handleInboundBulkClose(msg)
	})
	s.SetLink(BulkResetSignalKey, func(msg *Message) {
		s.handleInboundBulkReset(msg)
	})
	s.SetLink(BulkReleaseSignalKey, func(msg *Message) {
		s.handleInboundBulkRelease(msg)
	})
}

func (c *ClientCommon) handleInboundBulkOpen(msg *Message) {
	req, err := decodeBulkOpenRequest(msg)
	resp := BulkOpenResponse{BulkID: req.BulkID, DataID: req.DataID, Dedicated: req.Dedicated}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if req.Dedicated {
		if err := clientDedicatedBulkSupportError(c); err != nil {
			resp.Error = err.Error()
			replyBulkControlIfNeeded(msg, resp)
			return
		}
	}
	runtime := c.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	scope := clientFileScope()
	if req.DataID == 0 {
		req.DataID = runtime.nextDataID()
		resp.DataID = req.DataID
	}
	if req.Dedicated && req.AttachToken == "" {
		req.AttachToken = newBulkAttachToken()
	}
	resp.AttachToken = req.AttachToken
	bulk := newBulkHandle(c.clientStopContextSnapshot(), runtime, scope, req, c.currentClientSessionEpoch(), nil, nil, 0, clientBulkCloseSender(c), clientBulkResetSender(c), clientBulkDataSender(c, c.currentClientSessionEpoch()), clientBulkWriteSender(c, c.currentClientSessionEpoch()), clientBulkReleaseSender(c))
	bulk.setClientSnapshotOwner(c)
	if err := runtime.register(scope, bulk); err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	handler := runtime.handlerSnapshot()
	if handler == nil {
		bulk.markReset(errBulkHandlerNotConfigured)
		resp.Error = errBulkHandlerNotConfigured.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if req.Dedicated {
		if err := c.attachDedicatedBulkSidecar(context.Background(), bulk); err != nil {
			bulk.markReset(err)
			resp.Error = err.Error()
			replyBulkControlIfNeeded(msg, resp)
			return
		}
	}
	info := BulkAcceptInfo{
		ID:                  bulk.ID(),
		Range:               bulk.Range(),
		Metadata:            bulk.Metadata(),
		Dedicated:           bulk.Dedicated(),
		TransportGeneration: bulk.TransportGeneration(),
		Bulk:                bulk,
	}
	if err := handler(info); err != nil {
		bulk.markReset(err)
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	resp.Accepted = true
	resp.DataID = bulk.dataIDSnapshot()
	resp.TransportGeneration = bulk.TransportGeneration()
	replyBulkControlIfNeeded(msg, resp)
}

func (s *ServerCommon) handleInboundBulkOpen(msg *Message) {
	req, err := decodeBulkOpenRequest(msg)
	resp := BulkOpenResponse{BulkID: req.BulkID, DataID: req.DataID, Dedicated: req.Dedicated}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	runtime := s.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	logical := messageLogicalConnSnapshot(msg)
	if logical == nil {
		resp.Error = errBulkLogicalConnNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	transport := messageTransportConnSnapshot(msg)
	if req.Dedicated {
		if err := logicalDedicatedBulkSupportError(logical); err != nil {
			resp.Error = err.Error()
			replyBulkControlIfNeeded(msg, resp)
			return
		}
		if transport != nil {
			if err := transportDedicatedBulkSupportError(transport); err != nil {
				resp.Error = err.Error()
				replyBulkControlIfNeeded(msg, resp)
				return
			}
		}
	}
	scope := serverFileScope(logical)
	if req.DataID == 0 {
		req.DataID = runtime.nextDataID()
		resp.DataID = req.DataID
	}
	if req.Dedicated && req.AttachToken == "" {
		req.AttachToken = newBulkAttachToken()
	}
	resp.AttachToken = req.AttachToken
	bulk := newBulkHandle(logical.stopContextSnapshot(), runtime, scope, req, 0, logical, transport, bulkTransportGeneration(logical, transport), serverBulkCloseSender(s, logical, transport), serverBulkResetSender(s, logical, transport), serverBulkDataSender(s, transport), serverBulkWriteSender(s, logical, transport), serverBulkReleaseSender(s, logical, transport))
	if err := runtime.register(scope, bulk); err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	handler := runtime.handlerSnapshot()
	if handler == nil {
		bulk.markReset(errBulkHandlerNotConfigured)
		resp.Error = errBulkHandlerNotConfigured.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	info := BulkAcceptInfo{
		ID:                  bulk.ID(),
		Range:               bulk.Range(),
		Metadata:            bulk.Metadata(),
		Dedicated:           bulk.Dedicated(),
		LogicalConn:         logical,
		TransportConn:       transport,
		TransportGeneration: bulk.TransportGeneration(),
		Bulk:                bulk,
	}
	if err := handler(info); err != nil {
		bulk.markReset(err)
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	resp.Accepted = true
	resp.DataID = bulk.dataIDSnapshot()
	resp.TransportGeneration = bulk.TransportGeneration()
	replyBulkControlIfNeeded(msg, resp)
}

func (c *ClientCommon) handleInboundBulkClose(msg *Message) {
	req, err := decodeBulkCloseRequest(msg)
	resp := BulkCloseResponse{BulkID: req.BulkID}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	runtime := c.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	bulk, ok := runtime.lookup(clientFileScope(), req.BulkID)
	if !ok {
		resp.Error = errBulkNotFound.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if req.Full {
		bulk.markPeerClosed()
	} else {
		bulk.markRemoteClosed()
	}
	resp.Accepted = true
	replyBulkControlIfNeeded(msg, resp)
}

func (s *ServerCommon) handleInboundBulkClose(msg *Message) {
	req, err := decodeBulkCloseRequest(msg)
	resp := BulkCloseResponse{BulkID: req.BulkID}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	runtime := s.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	logical := messageLogicalConnSnapshot(msg)
	scope := serverFileScope(logical)
	bulk, ok := runtime.lookup(scope, req.BulkID)
	if !ok {
		resp.Error = errBulkNotFound.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if req.Full {
		bulk.markPeerClosed()
	} else {
		bulk.markRemoteClosed()
	}
	resp.Accepted = true
	replyBulkControlIfNeeded(msg, resp)
}

func (c *ClientCommon) handleInboundBulkReset(msg *Message) {
	req, err := decodeBulkResetRequest(msg)
	resp := BulkResetResponse{BulkID: req.BulkID}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	runtime := c.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	bulk, ok := runtime.lookup(clientFileScope(), req.BulkID)
	if !ok && req.DataID != 0 {
		bulk, ok = runtime.lookupByDataID(clientFileScope(), req.DataID)
	}
	if !ok {
		resp.Error = errBulkNotFound.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if resp.BulkID == "" {
		resp.BulkID = bulk.ID()
	}
	bulk.markReset(bulkResetError(bulkRemoteResetError(req.Error)))
	resp.Accepted = true
	replyBulkControlIfNeeded(msg, resp)
}

func (c *ClientCommon) handleInboundBulkRelease(msg *Message) {
	req, err := decodeBulkReleaseRequest(msg)
	if err != nil {
		return
	}
	runtime := c.getBulkRuntime()
	if runtime == nil {
		return
	}
	bulk, ok := runtime.lookup(clientFileScope(), req.BulkID)
	if !ok && req.DataID != 0 {
		bulk, ok = runtime.lookupByDataID(clientFileScope(), req.DataID)
	}
	if !ok {
		return
	}
	bulk.releaseOutboundWindow(req.Bytes, req.Chunks)
}

func (s *ServerCommon) handleInboundBulkReset(msg *Message) {
	req, err := decodeBulkResetRequest(msg)
	resp := BulkResetResponse{BulkID: req.BulkID}
	if err != nil {
		resp.Error = err.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	runtime := s.getBulkRuntime()
	if runtime == nil {
		resp.Error = errBulkRuntimeNil.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	logical := messageLogicalConnSnapshot(msg)
	scope := serverFileScope(logical)
	bulk, ok := runtime.lookup(scope, req.BulkID)
	if !ok && req.DataID != 0 {
		bulk, ok = runtime.lookupByDataID(scope, req.DataID)
	}
	if !ok {
		resp.Error = errBulkNotFound.Error()
		replyBulkControlIfNeeded(msg, resp)
		return
	}
	if resp.BulkID == "" {
		resp.BulkID = bulk.ID()
	}
	bulk.markReset(bulkResetError(bulkRemoteResetError(req.Error)))
	resp.Accepted = true
	replyBulkControlIfNeeded(msg, resp)
}

func (s *ServerCommon) handleInboundBulkRelease(msg *Message) {
	req, err := decodeBulkReleaseRequest(msg)
	if err != nil {
		return
	}
	runtime := s.getBulkRuntime()
	if runtime == nil {
		return
	}
	logical := messageLogicalConnSnapshot(msg)
	scope := serverFileScope(logical)
	bulk, ok := runtime.lookup(scope, req.BulkID)
	if !ok && req.DataID != 0 {
		bulk, ok = runtime.lookupByDataID(scope, req.DataID)
	}
	if !ok {
		return
	}
	bulk.releaseOutboundWindow(req.Bytes, req.Chunks)
}

func replyBulkControlIfNeeded(msg *Message, value interface{}) {
	if msg == nil || !requiresSignalReplyWait(msg.TransferMsg) {
		return
	}
	_ = msg.ReplyObj(value)
}

func sendBulkOpenClient(ctx context.Context, c Client, req BulkOpenRequest) (BulkOpenResponse, error) {
	if c == nil {
		return BulkOpenResponse{}, errBulkClientNil
	}
	msg, err := c.SendObjCtx(ctx, BulkOpenSignalKey, req)
	if err != nil {
		return BulkOpenResponse{}, err
	}
	return decodeBulkOpenResponse(msg)
}

func sendBulkOpenServerLogical(ctx context.Context, s Server, logical *LogicalConn, req BulkOpenRequest) (BulkOpenResponse, error) {
	if s == nil {
		return BulkOpenResponse{}, errBulkServerNil
	}
	if logical == nil {
		return BulkOpenResponse{}, errBulkLogicalConnNil
	}
	msg, err := s.SendObjCtxLogical(ctx, logical, BulkOpenSignalKey, req)
	if err != nil {
		return BulkOpenResponse{}, err
	}
	return decodeBulkOpenResponse(msg)
}

func sendBulkOpenServerTransport(ctx context.Context, s Server, transport *TransportConn, req BulkOpenRequest) (BulkOpenResponse, error) {
	if s == nil {
		return BulkOpenResponse{}, errBulkServerNil
	}
	if transport == nil {
		return BulkOpenResponse{}, errBulkTransportNil
	}
	msg, err := s.SendObjCtxTransport(ctx, transport, BulkOpenSignalKey, req)
	if err != nil {
		return BulkOpenResponse{}, err
	}
	return decodeBulkOpenResponse(msg)
}

func sendBulkCloseClient(ctx context.Context, c Client, req BulkCloseRequest) (BulkCloseResponse, error) {
	if c == nil {
		return BulkCloseResponse{}, errBulkClientNil
	}
	msg, err := c.SendObjCtx(ctx, BulkCloseSignalKey, req)
	if err != nil {
		return BulkCloseResponse{}, err
	}
	return decodeBulkCloseResponse(msg)
}

func sendBulkCloseServerLogical(ctx context.Context, s Server, logical *LogicalConn, req BulkCloseRequest) (BulkCloseResponse, error) {
	if s == nil {
		return BulkCloseResponse{}, errBulkServerNil
	}
	if logical == nil {
		return BulkCloseResponse{}, errBulkLogicalConnNil
	}
	msg, err := s.SendObjCtxLogical(ctx, logical, BulkCloseSignalKey, req)
	if err != nil {
		return BulkCloseResponse{}, err
	}
	return decodeBulkCloseResponse(msg)
}

func sendBulkCloseServerTransport(ctx context.Context, s Server, transport *TransportConn, req BulkCloseRequest) (BulkCloseResponse, error) {
	if s == nil {
		return BulkCloseResponse{}, errBulkServerNil
	}
	if transport == nil {
		return BulkCloseResponse{}, errBulkTransportNil
	}
	msg, err := s.SendObjCtxTransport(ctx, transport, BulkCloseSignalKey, req)
	if err != nil {
		return BulkCloseResponse{}, err
	}
	return decodeBulkCloseResponse(msg)
}

func sendBulkResetClient(ctx context.Context, c Client, req BulkResetRequest) (BulkResetResponse, error) {
	if c == nil {
		return BulkResetResponse{}, errBulkClientNil
	}
	msg, err := c.SendObjCtx(ctx, BulkResetSignalKey, req)
	if err != nil {
		return BulkResetResponse{}, err
	}
	return decodeBulkResetResponse(msg)
}

func sendBulkResetServerLogical(ctx context.Context, s Server, logical *LogicalConn, req BulkResetRequest) (BulkResetResponse, error) {
	if s == nil {
		return BulkResetResponse{}, errBulkServerNil
	}
	if logical == nil {
		return BulkResetResponse{}, errBulkLogicalConnNil
	}
	msg, err := s.SendObjCtxLogical(ctx, logical, BulkResetSignalKey, req)
	if err != nil {
		return BulkResetResponse{}, err
	}
	return decodeBulkResetResponse(msg)
}

func sendBulkResetServerTransport(ctx context.Context, s Server, transport *TransportConn, req BulkResetRequest) (BulkResetResponse, error) {
	if s == nil {
		return BulkResetResponse{}, errBulkServerNil
	}
	if transport == nil {
		return BulkResetResponse{}, errBulkTransportNil
	}
	msg, err := s.SendObjCtxTransport(ctx, transport, BulkResetSignalKey, req)
	if err != nil {
		return BulkResetResponse{}, err
	}
	return decodeBulkResetResponse(msg)
}

func sendBulkReleaseClient(c Client, req BulkReleaseRequest) error {
	if c == nil {
		return errBulkClientNil
	}
	return c.SendObj(BulkReleaseSignalKey, req)
}

func sendBulkReleaseServerLogical(s Server, logical *LogicalConn, req BulkReleaseRequest) error {
	if s == nil {
		return errBulkServerNil
	}
	if logical == nil {
		return errBulkLogicalConnNil
	}
	return s.SendObjLogical(logical, BulkReleaseSignalKey, req)
}

func sendBulkReleaseServerTransport(s Server, transport *TransportConn, req BulkReleaseRequest) error {
	if s == nil {
		return errBulkServerNil
	}
	if transport == nil {
		return errBulkTransportNil
	}
	return s.SendObjTransport(transport, BulkReleaseSignalKey, req)
}

func decodeBulkOpenRequest(msg *Message) (BulkOpenRequest, error) {
	var req BulkOpenRequest
	if msg == nil {
		return BulkOpenRequest{}, errBulkIDEmpty
	}
	if err := msg.Value.Orm(&req); err != nil {
		return BulkOpenRequest{}, err
	}
	req = normalizeBulkOpenRequest(req)
	if req.BulkID == "" {
		return BulkOpenRequest{}, errBulkIDEmpty
	}
	if !validBulkRange(req.Range) {
		return BulkOpenRequest{}, errBulkRangeInvalid
	}
	return req, nil
}

func decodeBulkCloseRequest(msg *Message) (BulkCloseRequest, error) {
	var req BulkCloseRequest
	if msg == nil {
		return BulkCloseRequest{}, errBulkIDEmpty
	}
	if err := msg.Value.Orm(&req); err != nil {
		return BulkCloseRequest{}, err
	}
	if req.BulkID == "" {
		return BulkCloseRequest{}, errBulkIDEmpty
	}
	return req, nil
}

func decodeBulkResetRequest(msg *Message) (BulkResetRequest, error) {
	var req BulkResetRequest
	if msg == nil {
		return BulkResetRequest{}, errBulkIDEmpty
	}
	if err := msg.Value.Orm(&req); err != nil {
		return BulkResetRequest{}, err
	}
	if req.BulkID == "" && req.DataID == 0 {
		return BulkResetRequest{}, errBulkIDEmpty
	}
	return req, nil
}

func decodeBulkReleaseRequest(msg *Message) (BulkReleaseRequest, error) {
	var req BulkReleaseRequest
	if msg == nil {
		return BulkReleaseRequest{}, errBulkIDEmpty
	}
	if err := msg.Value.Orm(&req); err != nil {
		return BulkReleaseRequest{}, err
	}
	if req.BulkID == "" && req.DataID == 0 {
		return BulkReleaseRequest{}, errBulkIDEmpty
	}
	if req.Bytes < 0 || req.Chunks < 0 {
		return BulkReleaseRequest{}, errBulkRangeInvalid
	}
	return req, nil
}

func decodeBulkOpenResponse(msg Message) (BulkOpenResponse, error) {
	var resp BulkOpenResponse
	if err := msg.Value.Orm(&resp); err != nil {
		return BulkOpenResponse{}, err
	}
	return resp, bulkControlResultError("open", resp.Accepted, resp.Error, nil)
}

func decodeBulkCloseResponse(msg Message) (BulkCloseResponse, error) {
	var resp BulkCloseResponse
	if err := msg.Value.Orm(&resp); err != nil {
		return BulkCloseResponse{}, err
	}
	return resp, bulkControlResultError("close", resp.Accepted, resp.Error, nil)
}

func decodeBulkResetResponse(msg Message) (BulkResetResponse, error) {
	var resp BulkResetResponse
	if err := msg.Value.Orm(&resp); err != nil {
		return BulkResetResponse{}, err
	}
	return resp, bulkControlResultError("reset", resp.Accepted, resp.Error, nil)
}

func bulkControlResultError(op string, accepted bool, message string, callErr error) error {
	if callErr != nil {
		return callErr
	}
	if message != "" {
		return bulkControlMessageError(message)
	}
	if accepted {
		return nil
	}
	if op == "open" {
		return errBulkRejected
	}
	return errors.New("bulk " + op + " rejected")
}

func bulkControlMessageError(message string) error {
	switch message {
	case errBulkNotFound.Error():
		return errBulkNotFound
	case errBulkAlreadyExists.Error():
		return errBulkAlreadyExists
	case errBulkHandlerNotConfigured.Error():
		return errBulkHandlerNotConfigured
	case errBulkLogicalConnNil.Error():
		return errBulkLogicalConnNil
	case errBulkTransportNil.Error():
		return errBulkTransportNil
	case errBulkRuntimeNil.Error():
		return errBulkRuntimeNil
	case errBulkIDEmpty.Error():
		return errBulkIDEmpty
	case errBulkRangeInvalid.Error():
		return errBulkRangeInvalid
	case errBulkDataIDEmpty.Error():
		return errBulkDataIDEmpty
	default:
		return errors.New(message)
	}
}

func bulkRemoteResetError(message string) error {
	if message == "" {
		return errBulkReset
	}
	return errors.New(message)
}

func bulkTransportGeneration(logical *LogicalConn, transport *TransportConn) uint64 {
	return streamTransportGeneration(logical, transport)
}