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/* 
 * This file is part of cert-signer
 * Copyright (c) 2024 Paolo Lulli.
 * 
 * This program is free software: you can redistribute it and/or modify  
 * it under the terms of the GNU General Public License as published by  
 * the Free Software Foundation, version 3.
 *
 * 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 
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package net.lulli.certsigner.ca;

import net.lulli.certsigner.util.FileCAUtils;
import net.lulli.certsigner.util.Serde;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Objects;

public class CaServer {
    private static final String CA_PATH = System.getenv("HOME") + "/.config/tlscerts/CA";
    private static final String CERTIFICATES_PATH = System.getenv("HOME") + "/.config/tlscerts";
    private final String serviceName;

    public CaServer(String serviceName) {
        Objects.requireNonNull(serviceName);

        this.serviceName = serviceName;

        init();
    }

    private String getServiceCaDir() {
        return CA_PATH + "/" + this.serviceName;
    }

    private String getClientCertsDir(String clientName) {
        return CERTIFICATES_PATH + "/" + this.serviceName + "/" + clientName;
    }

    private String getCSRPath(String clientName) {
        return CERTIFICATES_PATH + "/" + this.serviceName + "/" + clientName + "/" + clientName + ".csr";
    }

    private void init() {
        var home = new File(getServiceCaDir());
        if (!home.exists()) {
            home.mkdirs();
        }
    }

    public String getCsr(String clientName) {
        try {
            var caServer = new CaServer(this.serviceName);
            return Files.readString(Paths.get(getCSRPath(clientName)));
        } catch (Exception e) {
            throw new IllegalStateException(e.getMessage());
        }
    }

    public void initializeCa(String rootSubject, String rootKeyStorePass) {
        FileCAUtils.initializeCa(rootSubject, getServiceCaDir(), rootKeyStorePass);
    }

    public String createCert(String rootKeyStorePass, String rootSubject, String clientName) {

        var csrContent = getCsr(clientName);
        var pkcs10CertificationRequest = Serde.pemToCsr(csrContent);

        return FileCAUtils.signCertificateWithRootKeystore(getServiceCaDir() + "/root-cert.p12",
                rootKeyStorePass,
                pkcs10CertificationRequest,
                rootSubject,
                getClientCertsDir(clientName),
                clientName
        );
    }
}