package validate

import (
	"regexp"
	"slices"
	"strings"
	"unicode/utf8"
)

// PermittedValue reports whether value appears in permittedValues.
func PermittedValue[T comparable](value T, permittedValues ...T) bool {
	return slices.Contains(permittedValues, value)
}

// Matches reports whether value satisfies rx.
func Matches(value string, rx *regexp.Regexp) bool {
	return rx.MatchString(value)
}

// Unique reports whether values contains no duplicate elements.
func Unique[T comparable](values []T) bool {
	uniqueValues := make(map[T]bool)

	for _, value := range values {
		uniqueValues[value] = true
	}

	return len(values) == len(uniqueValues)
}

// NotBlank reports whether value contains non-whitespace characters.
func NotBlank(value string) bool {
	return strings.TrimSpace(value) != ""
}

// MaxChars reports whether value contains at most n Unicode code points.
func MaxChars(value string, n int) bool {
	return utf8.RuneCountInString(value) <= n
}

// MinChars reports whether value contains at least n Unicode code points.
func MinChars(value string, n int) bool {
	return utf8.RuneCountInString(value) >= n
}