package direct

import (
	"context"
	"io"

	"github.com/ledgerwatch/erigon-lib/gointerfaces/remote"
	"github.com/ledgerwatch/erigon-lib/gointerfaces/types"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/types/known/emptypb"
)

type EthBackendClientDirect struct {
	server remote.ETHBACKENDServer
}

func NewEthBackendClientDirect(server remote.ETHBACKENDServer) *EthBackendClientDirect {
	return &EthBackendClientDirect{server: server}
}

func (s *EthBackendClientDirect) Etherbase(ctx context.Context, in *remote.EtherbaseRequest, opts ...grpc.CallOption) (*remote.EtherbaseReply, error) {
	return s.server.Etherbase(ctx, in)
}

func (s *EthBackendClientDirect) NetVersion(ctx context.Context, in *remote.NetVersionRequest, opts ...grpc.CallOption) (*remote.NetVersionReply, error) {
	return s.server.NetVersion(ctx, in)
}

func (s *EthBackendClientDirect) NetPeerCount(ctx context.Context, in *remote.NetPeerCountRequest, opts ...grpc.CallOption) (*remote.NetPeerCountReply, error) {
	return s.server.NetPeerCount(ctx, in)
}

func (s *EthBackendClientDirect) EngineGetPayloadV1(ctx context.Context, in *remote.EngineGetPayloadRequest, opts ...grpc.CallOption) (*types.ExecutionPayload, error) {
	return s.server.EngineGetPayloadV1(ctx, in)
}

func (s *EthBackendClientDirect) EngineNewPayloadV1(ctx context.Context, in *types.ExecutionPayload, opts ...grpc.CallOption) (*remote.EnginePayloadStatus, error) {
	return s.server.EngineNewPayloadV1(ctx, in)
}

func (s *EthBackendClientDirect) EngineForkChoiceUpdatedV1(ctx context.Context, in *remote.EngineForkChoiceUpdatedRequest, opts ...grpc.CallOption) (*remote.EngineForkChoiceUpdatedReply, error) {
	return s.server.EngineForkChoiceUpdatedV1(ctx, in)
}

func (s *EthBackendClientDirect) Version(ctx context.Context, in *emptypb.Empty, opts ...grpc.CallOption) (*types.VersionReply, error) {
	return s.server.Version(ctx, in)
}

func (s *EthBackendClientDirect) ProtocolVersion(ctx context.Context, in *remote.ProtocolVersionRequest, opts ...grpc.CallOption) (*remote.ProtocolVersionReply, error) {
	return s.server.ProtocolVersion(ctx, in)
}

func (s *EthBackendClientDirect) ClientVersion(ctx context.Context, in *remote.ClientVersionRequest, opts ...grpc.CallOption) (*remote.ClientVersionReply, error) {
	return s.server.ClientVersion(ctx, in)
}

// -- start Subscribe

func (s *EthBackendClientDirect) Subscribe(ctx context.Context, in *remote.SubscribeRequest, opts ...grpc.CallOption) (remote.ETHBACKEND_SubscribeClient, error) {
	ch := make(chan *subscribeReply, 16384)
	streamServer := &SubscribeStreamS{ch: ch, ctx: ctx}
	go func() {
		defer close(ch)
		streamServer.Err(s.server.Subscribe(in, streamServer))
	}()
	return &SubscribeStreamC{ch: ch, ctx: ctx}, nil
}

type subscribeReply struct {
	r   *remote.SubscribeReply
	err error
}
type SubscribeStreamS struct {
	ch  chan *subscribeReply
	ctx context.Context
	grpc.ServerStream
}

func (s *SubscribeStreamS) Send(m *remote.SubscribeReply) error {
	s.ch <- &subscribeReply{r: m}
	return nil
}
func (s *SubscribeStreamS) Context() context.Context { return s.ctx }
func (s *SubscribeStreamS) Err(err error) {
	if err == nil {
		return
	}
	s.ch <- &subscribeReply{err: err}
}

type SubscribeStreamC struct {
	ch  chan *subscribeReply
	ctx context.Context
	grpc.ClientStream
}

func (c *SubscribeStreamC) Recv() (*remote.SubscribeReply, error) {
	m, ok := <-c.ch
	if !ok || m == nil {
		return nil, io.EOF
	}
	return m.r, m.err
}
func (c *SubscribeStreamC) Context() context.Context { return c.ctx }

// -- end Subscribe

func (s *EthBackendClientDirect) Block(ctx context.Context, in *remote.BlockRequest, opts ...grpc.CallOption) (*remote.BlockReply, error) {
	return s.server.Block(ctx, in)
}

func (s *EthBackendClientDirect) TxnLookup(ctx context.Context, in *remote.TxnLookupRequest, opts ...grpc.CallOption) (*remote.TxnLookupReply, error) {
	return s.server.TxnLookup(ctx, in)
}

func (s *EthBackendClientDirect) NodeInfo(ctx context.Context, in *remote.NodesInfoRequest, opts ...grpc.CallOption) (*remote.NodesInfoReply, error) {
	return s.server.NodeInfo(ctx, in)
}