package validation

import (
    "regexp"
    "strings"
    "unicode"
    
    "github.com/go-playground/validator/v10"
)

// RegisterCustomValidators registers custom validation rules
func RegisterCustomValidators(validate *validator.Validate) {
    validate.RegisterValidation("nospace", validateNoSpace)
    validate.RegisterValidation("alphanumunderscore", validateAlphaNumUnderscore)
    validate.RegisterValidation("alphaspace", validateAlphaSpace) // Add this
    validate.RegisterValidation("alphanum", validateAlphaNum)      // Add this

    RegisterPortValidators(validate) // Ensure port validators are registered
}

// validateNoSpace checks that the field contains no spaces
func validateNoSpace(fl validator.FieldLevel) bool {
    value := fl.Field().String()
    return !strings.Contains(value, " ")
}

// validateAlphaNumUnderscore allows alphanumeric characters and underscores only
func validateAlphaNumUnderscore(fl validator.FieldLevel) bool {
    value := fl.Field().String()
    matched, _ := regexp.MatchString("^[a-zA-Z0-9_]+$", value)
    return matched
}

// validateAlphaSpace allows alphabetic characters and spaces only (for names)
func validateAlphaSpace(fl validator.FieldLevel) bool {
    value := fl.Field().String()
    for _, char := range value {
        if !unicode.IsLetter(char) && char != ' ' {
            return false
        }
    }
    return true
}

// validateAlphaNum allows alphanumeric characters only
func validateAlphaNum(fl validator.FieldLevel) bool {
    value := fl.Field().String()
    matched, _ := regexp.MatchString("^[a-zA-Z0-9]+$", value)
    return matched
}