// Copyright © 2019 Peter Kurfer peter.kurfer@googlemail.com
//
// 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 rendering

import (
	"fmt"
	"net/http"
	"os"
	"path"
)

type MarkdownHandler interface {
	http.Handler
}

func NewMarkdownHandler(markdownPath string) (handler MarkdownHandler, err error) {
	var info os.FileInfo
	info, err = os.Stat(markdownPath)
	if err != nil {
		return
	}

	if info.IsDir() || path.Ext(info.Name()) != ".md" {
		err = fmt.Errorf("path %s did not pass sanity checks for markdown files", markdownPath)
		return
	}

	handler = &markdownHandler{
		markdownPath: markdownPath,
	}
	return
}

type markdownHandler struct {
	markdownPath string
}

func (handler *markdownHandler) ServeHTTP(response http.ResponseWriter, request *http.Request) {
	http.ServeFile(response, request, handler.markdownPath)
}