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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2025 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.signatures.validation.extensions;

import com.itextpdf.bouncycastleconnector.BouncyCastleFactoryCreator;
import com.itextpdf.commons.bouncycastle.IBouncyCastleFactory;
import com.itextpdf.commons.utils.MessageFormatUtil;
import com.itextpdf.kernel.crypto.OID;

import java.security.cert.X509Certificate;

/**
 * Class representing "Basic Constraints" certificate extension,
 * which uses provided amount of certificates in chain during the comparison.
 */
public class DynamicBasicConstraintsExtension extends DynamicCertificateExtension {
    private static final IBouncyCastleFactory FACTORY = BouncyCastleFactoryCreator.getFactory();
    public static final String ERROR_MESSAGE =
            "Expected extension 2.5.29.19 to have a value of at least {0} but found {1}";
    private String errorMessage;

    /**
     * Create new instance of {@link DynamicBasicConstraintsExtension}.
     */
    public DynamicBasicConstraintsExtension() {
        super(OID.X509Extensions.BASIC_CONSTRAINTS, FACTORY.createBasicConstraints(true).toASN1Primitive());
    }

    /**
     * Check if this extension is present in the provided certificate.
     * In case of {@link DynamicBasicConstraintsExtension}, check if path length for this extension is less or equal
     * to the path length, specified in the certificate.
     *
     * @param certificate {@link X509Certificate} in which this extension shall be present
     *
     * @return {@code true} if this path length is less or equal to a one from the certificate, {@code false} otherwise
     */
    @Override
    public boolean existsInCertificate(X509Certificate certificate) {
        if (certificate.getBasicConstraints() >= getCertificateChainSize() - 1) {
            return true;
        }
        errorMessage = MessageFormatUtil.format(ERROR_MESSAGE,
                getCertificateChainSize() - 1, certificate.getBasicConstraints());
        return false;
    }

    @Override
    public String getMessage() {
        return errorMessage;
    }
}