package bookfile

import (
	"path/filepath"
	"strings"
	"unicode"
)

func FormatFromExt(name string) string {
	switch strings.ToLower(filepath.Ext(name)) {
	case ".cbz", ".zip":
		return "cbz"
	case ".pdf":
		return "pdf"
	case ".epub":
		return "epub"
	case ".txt":
		return "txt"
	case ".md":
		return "md"
	}
	return ""
}

func SafeName(s string) string {
	s = strings.Map(func(r rune) rune {
		if unicode.IsControl(r) {
			return -1
		}
		return r
	}, s)
	s = strings.ReplaceAll(s, "\\", "/")
	s = filepath.Base(filepath.ToSlash(s))
	if s == "." || s == "/" {
		return ""
	}
	s = strings.TrimSpace(s)
	if len(s) > 200 {
		s = strings.TrimSpace(s[:200])
	}
	return s
}