package encoding

import (
	_ "google.golang.org/grpc/encoding/proto" // Ensure default codec is registered before our one.
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/protoadapt"
)

// messageV2Of converts v to a proto.Message.
// This is needed for this library to continue working in presence of external gRPC packages,
// such as opentelemetry gRPC exporter.
// Copied from https://github.com/grpc/grpc-go/blob/e524655becd8d4c7ba9e8687faef456e495e341e/encoding/proto/proto.go#L59.
func messageV2Of(v any) proto.Message {
	switch v := v.(type) {
	case protoadapt.MessageV1:
		return protoadapt.MessageV2Of(v)
	case protoadapt.MessageV2:
		return v
	}

	return nil
}