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package zeroecho.pki.api;

import java.time.Instant;

/**
 * Validity interval for an issued credential.
 *
 * <p>
 * The PKI core requires {@code notAfter} to be strictly after
 * {@code notBefore}. Framework-specific interpretations (inclusive/exclusive)
 * are resolved by the framework backend.
 * </p>
 *
 * <p>
 * Policy and profile constraints (maximum lifetime, not-before skew) must be
 * enforced by the PKI runtime.
 * </p>
 *
 * @param notBefore start of validity interval (inclusive)
 * @param notAfter  end of validity interval (must be after {@code notBefore})
 */
public record Validity(Instant notBefore, Instant notAfter) {

    /**
     * Creates a validity interval.
     *
     * @param notBefore start of validity interval (inclusive)
     * @param notAfter  end of validity interval
     * @throws IllegalArgumentException if inputs are null or the interval is
     *                                  invalid
     */
    public Validity {
        if (notBefore == null || notAfter == null) {
            throw new IllegalArgumentException("notBefore/notAfter must not be null");
        }
        if (!notAfter.isAfter(notBefore)) {
            throw new IllegalArgumentException("notAfter must be after notBefore");
        }
    }
}
