// Copyright 2019 TiKV Project 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package api

import (
	"net/http"

	"github.com/tikv/pd/pkg/errs"
	"github.com/tikv/pd/server"
	"github.com/unrolled/render"
)

type clusterMiddleware struct {
	s  *server.Server
	rd *render.Render
}

func newClusterMiddleware(s *server.Server) clusterMiddleware {
	return clusterMiddleware{
		s:  s,
		rd: render.New(render.Options{IndentJSON: true}),
	}
}

func (m clusterMiddleware) Middleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		rc := m.s.GetRaftCluster()
		if rc == nil {
			m.rd.JSON(w, http.StatusInternalServerError, errs.ErrNotBootstrapped.FastGenByArgs().Error())
			return
		}
		ctx := withClusterCtx(r.Context(), rc)
		h.ServeHTTP(w, r.WithContext(ctx))
	})
}