package input

import (
	"fmt"
	"net/mail"
	"regexp"
)

var (
	// RegexAlphanumerical is a basic alphanumerical regex to be use in RegexInput function.
	RegexAlphanumerical = regexp.MustCompile(`^[a-zA-Z0-9\-\_]*$`)
	// RegexAlphanumericalAndSpace is a basic alphanumerical regex with space as an additionnal valid character to be use in RegexInput function.
	RegexAlphanumericalAndSpace = regexp.MustCompile(`^[a-zA-Z0-9\-\_\s]*$`)
)

// Regex permit to ask user for an input and check that it match the given regex rule.
// if not user will see the errMsg and be asked for another input.
func Regex(mandatory bool, regex *regexp.Regexp, errMsg string) string {

	value := Ask(mandatory, func(in string) (string, error) {

		if !regex.MatchString(in) {
			return "", fmt.Errorf("%s", errMsg)
		}

		return in, nil
	})

	return value
}

// Alphanumerical will ask user for an input respecting the RegexAlphanumerical.
func Alphanumerical(mandatory bool) string {
	return Regex(mandatory, RegexAlphanumerical, "Please use a-z, A-Z, 0-9, - and _ characters only.")
}

// AlphanumericalAndSpace will ask user for an input respecting the RegexAlphanumericalAndSpace.
func AlphanumericalAndSpace(mandatory bool) string {
	return Regex(mandatory, RegexAlphanumericalAndSpace, "Please use a-z, A-Z, 0-9, -, _ and space characters only.")
}

// String permit to ask user for any kind of string.
func String(mandatory bool) string {

	value := Ask(mandatory, func(in string) (string, error) {
		return in, nil
	})

	return value
}

// Mail permit to ask user for an email address.
func Mail(mandatory bool) string {

	value := Ask(mandatory, func(in string) (string, error) {

		_, err := mail.ParseAddress(in)
		if err != nil {
			return "", fmt.Errorf("expecting a valid mail address, please try again")
		}

		return in, nil
	})

	return value
}