valiktor - test.kt

val uuidRegex = "^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$".toRegex()

data class Account(
    var accountUUID: String,
    var createdAt: Instant,
    var modifiedAt: Instant,
    var status: AccountStatus
) {
    init {
        runCatching {
            validate(this) {
                validate(Account::accountUUID).matches(uuidRegex)
                validate(Account::createdAt).isNotNull()
                validate(Account::modifiedAt).isNotNull()
                validate(Account::status).isNotNull()
            }
        }.throwOnFailure()
    }
}

fun <T> Result<T>.throwOnFailure() {
    if (isFailure) {
        throw IllegalArgumentException((exceptionOrNull() as ConstraintViolationException).getMessage())
    }
}

fun ConstraintViolationException.getMessage() =
    constraintViolations.fold(StringBuilder()) { result, violation ->
        val message = violation.toMessage(locale = Locale.ENGLISH)
        result.append("${violation.property}: $message")
        result
    }.toString()