// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package mime

import (
	"bufio"
	"os"
	"strings"
)

var typeFiles = []string{
	"/etc/mime.types",
	"/etc/apache2/mime.types",
	"/etc/apache/mime.types",
}

func loadMimeFile(filename string) {
	f, err := os.Open(filename)
	if err != nil {
		return
	}

	reader := bufio.NewReader(f)
	for {
		line, err := reader.ReadString('\n')
		if err != nil {
			f.Close()
			return
		}
		fields := strings.Fields(line)
		if len(fields) <= 1 || fields[0][0] == '#' {
			continue
		}
		mimeType := fields[0]
		for _, ext := range fields[1:] {
			if ext[0] == '#' {
				break
			}
			setExtensionType("."+ext, mimeType)
		}
	}
}

func initMime() {
	for _, filename := range typeFiles {
		loadMimeFile(filename)
	}
}

func initMimeForTests() map[string]string {
	typeFiles = []string{"test.types"}
	return map[string]string{
		".t1":  "application/test",
		".t2":  "text/test; charset=utf-8",
		".png": "image/png",
	}
}