package interceptor

import (
	"context"
	"errors"
	"runtime/debug"
	"sig-pub/pkg/zlog"

	"google.golang.org/grpc"
	"google.golang.org/grpc/grpclog"
	"google.golang.org/protobuf/types/known/emptypb"
)

func RecoverInterceptor(ctx context.Context, req any, server *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp any, err error) {
	defer func() {
		if r := recover(); r != nil {
			switch r := r.(type) {
			case error:
				err = r
			case string:
				err = errors.New(r)
			default:
				err = errors.New("grpc server recover error")
			}
			grpclog.Error("grpc server error: ", r)
			debug.PrintStack()
		}
	}()

	// zlog.Debugf("call method: %s", server.FullMethod) // -> /TradingService/IndicatorSeries
	resp, err = handler(ctx, req)
	if err == nil {
		if empty, ok := resp.(*emptypb.Empty); ok && empty == nil {
			resp = &emptypb.Empty{} // grpc: error while marshaling: proto: Marshal called with nil
		} else if resp == nil {
			zlog.Warningf("grpc request: has no response: method=%s, %v", server.FullMethod, req)
		}
	}
	return
}