/*
 * Copyright (c) 2020 Baidu, Inc.
 *
 * 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 routes

import (
	"net/http"

	"github.com/emicklei/go-restful"

	"github.com/baidu/easyfaas/pkg/version"
)

// Version provides a webservice with version information.
type Version struct {
	Version *version.Version
}

// Install registers the APIServer's `/version` handler.
func (v Version) Install(c *restful.Container) {
	if v.Version == nil {
		return
	}

	// Set up a service to return the git code version.
	versionWS := new(restful.WebService)
	versionWS.Path("/version")
	versionWS.Doc("git code version from which this is built")
	versionWS.Route(
		versionWS.GET("/").To(v.handleVersion).
			Doc("get the code version").
			Operation("getCodeVersion").
			Produces(restful.MIME_JSON).
			Consumes(restful.MIME_JSON).
			Writes(version.Version{}))

	c.Add(versionWS)
}

// handleVersion writes the server's version information.
func (v Version) handleVersion(req *restful.Request, resp *restful.Response) {
	resp.WriteHeader(http.StatusOK)
	resp.WriteAsJson(*v.Version)
}
