package lib

import "regexp"

var HandleRegex = regexp.MustCompile("^[a-z0-9]+([-_][a-z0-9_]+)*$")

const HandleMinLength = 3
const HandleMaxLength = 30

const UsernameMinLength = 2 
const UsernameMaxLength = 40

// validates a handle.
func ValidateHandle(s string) bool {
	// check if the format is correct using the regex
	if !HandleRegex.MatchString(s) {
		return false
	}

	// length constraint?
	length := len(s)
	if length < HandleMinLength || length > HandleMaxLength {
		return false
	}

	return true
}

// validates a username.
func ValidateUsername(s string) bool {
	length := len(s)
	if length < UsernameMinLength || length > UsernameMaxLength {
		return false
	}

	return true
}