package connect

import (
	"context"

	"connectrpc.com/connect"
	"google.golang.org/grpc/metadata"

	pb "northwest.io/nostr-grpc/api/nostr/v1"
	"northwest.io/nostr-grpc/api/nostr/v1/nostrv1connect"
	grpchandler "northwest.io/nostr-grpc/internal/handler/grpc"
)

type Handler struct {
	grpcServer *grpchandler.Server
}

func NewHandler(grpcServer *grpchandler.Server) *Handler {
	return &Handler{grpcServer: grpcServer}
}

func (h *Handler) PublishEvent(ctx context.Context, req *connect.Request[pb.PublishEventRequest]) (*connect.Response[pb.PublishEventResponse], error) {
	resp, err := h.grpcServer.PublishEvent(ctx, req.Msg)
	if err != nil {
		return nil, err
	}
	return connect.NewResponse(resp), nil
}

func (h *Handler) Subscribe(ctx context.Context, req *connect.Request[pb.SubscribeRequest], stream *connect.ServerStream[pb.Event]) error {
	return h.grpcServer.Subscribe(req.Msg, &subscribeStreamAdapter{stream: stream, ctx: ctx})
}

func (h *Handler) Unsubscribe(ctx context.Context, req *connect.Request[pb.UnsubscribeRequest]) (*connect.Response[pb.Empty], error) {
	resp, err := h.grpcServer.Unsubscribe(ctx, req.Msg)
	if err != nil {
		return nil, err
	}
	return connect.NewResponse(resp), nil
}

func (h *Handler) PublishBatch(ctx context.Context, req *connect.Request[pb.PublishBatchRequest]) (*connect.Response[pb.PublishBatchResponse], error) {
	resp, err := h.grpcServer.PublishBatch(ctx, req.Msg)
	if err != nil {
		return nil, err
	}
	return connect.NewResponse(resp), nil
}

func (h *Handler) QueryEvents(ctx context.Context, req *connect.Request[pb.QueryRequest]) (*connect.Response[pb.QueryResponse], error) {
	resp, err := h.grpcServer.QueryEvents(ctx, req.Msg)
	if err != nil {
		return nil, err
	}
	return connect.NewResponse(resp), nil
}

func (h *Handler) CountEvents(ctx context.Context, req *connect.Request[pb.CountRequest]) (*connect.Response[pb.CountResponse], error) {
	resp, err := h.grpcServer.CountEvents(ctx, req.Msg)
	if err != nil {
		return nil, err
	}
	return connect.NewResponse(resp), nil
}

type subscribeStreamAdapter struct {
	stream *connect.ServerStream[pb.Event]
	ctx    context.Context
}

func (s *subscribeStreamAdapter) Send(event *pb.Event) error {
	return s.stream.Send(event)
}

func (s *subscribeStreamAdapter) Context() context.Context {
	return s.ctx
}

func (s *subscribeStreamAdapter) SetHeader(md metadata.MD) error {
	return nil
}

func (s *subscribeStreamAdapter) SendHeader(md metadata.MD) error {
	return nil
}

func (s *subscribeStreamAdapter) SetTrailer(md metadata.MD) {
}

func (s *subscribeStreamAdapter) SendMsg(m any) error {
	if event, ok := m.(*pb.Event); ok {
		return s.Send(event)
	}
	return nil
}

func (s *subscribeStreamAdapter) RecvMsg(m any) error {
	return nil
}

var _ nostrv1connect.NostrRelayHandler = (*Handler)(nil)