package grpc

import (
	"github.com/go-kratos/kratos/v2/metadata"
	"github.com/go-kratos/kratos/v2/transport"
)

var (
	_ transport.Transporter = &Transport{}
)

// Transport is a gRPC transport.
type Transport struct {
	endpoint  string
	operation string
	metadata  metadata.Metadata
}

// Kind returns the transport kind.
func (tr *Transport) Kind() string {
	return "grpc"
}

// Endpoint returns the transport endpoint.
func (tr *Transport) Endpoint() string {
	return tr.endpoint
}

// Operation returns the transport operation.
func (tr *Transport) Operation() string {
	return tr.operation
}

// SetOperation sets the transport operation.
func (tr *Transport) SetOperation(operation string) {
	tr.operation = operation
}

// Metadata returns the transport metadata.
func (tr *Transport) Metadata() metadata.Metadata {
	return tr.metadata
}

// WithMetadata with a metadata into transport md.
func (tr *Transport) WithMetadata(md metadata.Metadata) {
	for k, v := range md {
		tr.metadata.Set(k, v)
	}
}