package container

import (
	"context"

	containersvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/container"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/container"
	containerGRPC "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/container/grpc"
)

// Server wraps FrostFS API Container service and
// provides gRPC Container service server interface.
type Server struct {
	srv containersvc.Server
}

// New creates, initializes and returns Server instance.
func New(c containersvc.Server) *Server {
	return &Server{
		srv: c,
	}
}

// Put converts gRPC PutRequest message and passes it to internal Container service.
func (s *Server) Put(ctx context.Context, req *containerGRPC.PutRequest) (*containerGRPC.PutResponse, error) {
	putReq := new(container.PutRequest)
	if err := putReq.FromGRPCMessage(req); err != nil {
		return nil, err
	}

	resp, err := s.srv.Put(ctx, putReq)
	if err != nil {
		return nil, err
	}

	return resp.ToGRPCMessage().(*containerGRPC.PutResponse), nil
}

// Delete converts gRPC DeleteRequest message and passes it to internal Container service.
func (s *Server) Delete(ctx context.Context, req *containerGRPC.DeleteRequest) (*containerGRPC.DeleteResponse, error) {
	delReq := new(container.DeleteRequest)
	if err := delReq.FromGRPCMessage(req); err != nil {
		return nil, err
	}

	resp, err := s.srv.Delete(ctx, delReq)
	if err != nil {
		return nil, err
	}

	return resp.ToGRPCMessage().(*containerGRPC.DeleteResponse), nil
}

// Get converts gRPC GetRequest message and passes it to internal Container service.
func (s *Server) Get(ctx context.Context, req *containerGRPC.GetRequest) (*containerGRPC.GetResponse, error) {
	getReq := new(container.GetRequest)
	if err := getReq.FromGRPCMessage(req); err != nil {
		return nil, err
	}

	resp, err := s.srv.Get(ctx, getReq)
	if err != nil {
		return nil, err
	}

	return resp.ToGRPCMessage().(*containerGRPC.GetResponse), nil
}

// List converts gRPC ListRequest message and passes it to internal Container service.
func (s *Server) List(ctx context.Context, req *containerGRPC.ListRequest) (*containerGRPC.ListResponse, error) {
	listReq := new(container.ListRequest)
	if err := listReq.FromGRPCMessage(req); err != nil {
		return nil, err
	}

	resp, err := s.srv.List(ctx, listReq)
	if err != nil {
		return nil, err
	}

	return resp.ToGRPCMessage().(*containerGRPC.ListResponse), nil
}

type containerStreamerV2 struct {
	containerGRPC.ContainerService_ListStreamServer
}

func (s *containerStreamerV2) Send(resp *container.ListStreamResponse) error {
	return s.ContainerService_ListStreamServer.Send(
		resp.ToGRPCMessage().(*containerGRPC.ListStreamResponse),
	)
}

// ListStream converts gRPC ListRequest message and server-side stream and overtakes its data
// to gRPC stream.
func (s *Server) ListStream(req *containerGRPC.ListStreamRequest, gStream containerGRPC.ContainerService_ListStreamServer) error {
	listReq := new(container.ListStreamRequest)
	if err := listReq.FromGRPCMessage(req); err != nil {
		return err
	}

	return s.srv.ListStream(listReq, &containerStreamerV2{
		ContainerService_ListStreamServer: gStream,
	})
}