/*
Copyright 2014 Google Inc. All rights reserved.

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 kubelet

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"net/url"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
	"gopkg.in/v1/yaml"
)

type KubeletServer struct {
	Kubelet       kubeletInterface
	UpdateChannel chan api.ContainerManifest
}

// kubeletInterface contains all the kubelet methods required by the server.
// For testablitiy.
type kubeletInterface interface {
	GetContainerID(name string) (string, error)
	GetContainerInfo(name string) (string, error)
}

func (s *KubeletServer) error(w http.ResponseWriter, err error) {
	w.WriteHeader(http.StatusInternalServerError)
	fmt.Fprintf(w, "Internal Error: %#v", err)
}

func (s *KubeletServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	u, err := url.ParseRequestURI(req.RequestURI)
	if err != nil {
		s.error(w, err)
		return
	}
	switch {
	case u.Path == "/container":
		defer req.Body.Close()
		data, err := ioutil.ReadAll(req.Body)
		if err != nil {
			s.error(w, err)
			return
		}
		var manifest api.ContainerManifest
		err = yaml.Unmarshal(data, &manifest)
		if err != nil {
			s.error(w, err)
			return
		}
		s.UpdateChannel <- manifest
	case u.Path == "/containerInfo":
		container := u.Query().Get("container")
		if len(container) == 0 {
			w.WriteHeader(http.StatusBadRequest)
			fmt.Fprint(w, "Missing container query arg.")
			return
		}
		id, err := s.Kubelet.GetContainerID(container)
		body, err := s.Kubelet.GetContainerInfo(id)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			fmt.Fprintf(w, "Internal Error: %#v", err)
			return
		}
		w.Header().Add("Content-type", "application/json")
		w.WriteHeader(http.StatusOK)
		fmt.Fprint(w, body)
	default:
		w.WriteHeader(http.StatusNotFound)
		fmt.Fprint(w, "Not found.")
	}
}