package helpers

import (
	"io"
	"mime"
	"net/http"
	"os"
	"path/filepath"
	"strings"
)

func MimeTypeForFile(path string, filename string) string {
	if mimeType := mime.TypeByExtension(strings.ToLower(filepath.Ext(filename))); mimeType != "" {
		return mimeType
	}

	file, err := os.Open(path)
	if err != nil {
		return "application/octet-stream"
	}
	defer file.Close()

	buffer := make([]byte, 512)
	bytesRead, err := file.Read(buffer)
	if err != nil && err != io.EOF {
		return "application/octet-stream"
	}

	return http.DetectContentType(buffer[:bytesRead])
}