/*
 * Copyright 2021 CloudWeGo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package descriptor

import (
	"encoding/json"
	"net/http"

	"github.com/cloudwego/kitex/internal/generic/proto"
)

type Renderer interface {
	Render(w http.ResponseWriter, body interface{}) error
	WriteContentType(w http.ResponseWriter)
}

type JsonRenderer struct{}

func (j JsonRenderer) Render(w http.ResponseWriter, body interface{}) error {
	return json.NewEncoder(w).Encode(body)
}

func (j JsonRenderer) WriteContentType(w http.ResponseWriter) {
	w.Header().Set("Content-Type", MIMEApplicationJson)
}

type PbRenderer struct{}

func (p PbRenderer) Render(w http.ResponseWriter, body interface{}) error {
	bytes, err := body.(proto.Message).Marshal()
	if err != nil {
		return err
	}
	_, err = w.Write(bytes)
	return err
}

func (p PbRenderer) WriteContentType(w http.ResponseWriter) {
	w.Header().Set("Content-Type", MIMEApplicationProtobuf)
}
