package site

import (
	"net/http"
	"path/filepath"
	"strings"
)

type siteFS struct {
	fs http.FileSystem
}

func (sfs siteFS) Open(path string) (http.File, error) {
	f, err := sfs.fs.Open(path)
	if err != nil {
		if strings.HasSuffix(path, ".html") {
			return nil, err
		}

		htmlPath := path + ".html"
		f, err = sfs.fs.Open(htmlPath)
		if err != nil {
			return nil, err
		}
	}

	s, err := f.Stat()
	if err != nil {
		return nil, err
	}

	if s.IsDir() {
		index := filepath.Join(path, "index.html")
		if _, err := sfs.fs.Open(index); err != nil {
			closeErr := f.Close()
			if closeErr != nil {
				return nil, closeErr
			}

			return nil, err
		}
	}

	return f, nil
}