//  Copyright (c) 2014 Couchbase, 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 http

import (
	"encoding/json"
	"io"
	"io/ioutil"
	"log"
	"net/http"
)

func showError(w http.ResponseWriter, r *http.Request,
	msg string, code int) {
	logger.Printf("Reporting error %v/%v", code, msg)
	http.Error(w, msg, code)
}

func mustEncode(w io.Writer, i interface{}) {
	if headered, ok := w.(http.ResponseWriter); ok {
		headered.Header().Set("Cache-Control", "no-cache")
		headered.Header().Set("Content-type", "application/json")
	}

	e := json.NewEncoder(w)
	if err := e.Encode(i); err != nil {
		panic(err)
	}
}

type varLookupFunc func(req *http.Request) string

var logger = log.New(ioutil.Discard, "bleve.http", log.LstdFlags)

// SetLog sets the logger used for logging
// by default log messages are sent to ioutil.Discard
func SetLog(l *log.Logger) {
	logger = l
}