package validate

import (
	"strings"
	"unicode"
)

func Name(name string) bool {
	if len(Fold(name)) == 0 || len(name) > 64 {
		return false
	}
	for _, r := range name {
		if unicode.IsControl(r) {
			return false
		}
	}
	return true
}

func Fold(s string) string {
	var sb strings.Builder
	var wasSpace bool
	for _, r := range s {
		for {
			f := unicode.SimpleFold(r)
			if f <= r {
				r = f
				break
			}
			r = f
		}
		r = unicode.ToLower(r)

		if !unicode.IsPrint(r) {
			continue
		}

		if r == ' ' {
			if wasSpace {
				continue
			}
			wasSpace = true
		} else {
			wasSpace = false
		}
		sb.WriteRune(r)
	}
	return strings.TrimSpace(sb.String())
}