package lang

import "fmt"

// Supported language codes
const (
	English = "en"
	Spanish = "es"
)

// All returns all supported language codes
func All() []string {
	return []string{English, Spanish}
}

// IsValid checks if a language code is supported
func IsValid(lang string) bool {
	return lang == English || lang == Spanish
}

// Validate returns an error if the language code is unsupported.
// It provides helpful error messages showing all supported languages.
//
// Example:
//
//	if err := lang.Validate("fr"); err != nil {
//	    // err: unsupported language: fr (supported: [en es])
//	}
func Validate(lang string) error {
	if !IsValid(lang) {
		return fmt.Errorf("unsupported language: %s (supported: %v)", lang, All())
	}
	return nil
}