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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.strategy.vault;

import net.lulli.certsigner.ca.CertificateData;
import net.lulli.certsigner.network.VaultLocal;
import net.lulli.certsigner.service.CertificateSigningService;
import net.lulli.certsigner.strategy.SigningStrategy;
import net.lulli.certsigner.util.Serde;
import org.json.JSONObject;

import java.util.Base64;
import java.util.HashMap;
import java.util.Objects;

public class VaultSigningStrategy implements SigningStrategy {
    private final String serviceName;
    private static String vaultEndpoint = System.getenv("VAULT_ENDPOINT");
    private static String vaultToken = System.getenv("VAULT_TOKEN");
    private static final String VAULT_PATH = "cert-auth";
    private final VaultLocal vaultLocal;


    public VaultSigningStrategy(String serviceName) {
        Objects.requireNonNull(serviceName);
        this.serviceName = serviceName;

        this.vaultLocal = new VaultLocal(vaultEndpoint, vaultToken);
    }

    @Override
    public String sign(String clientName) {
        var rootSubject = "CN=root-cert, O=" + serviceName;

        return createCert(rootSubject, clientName);
    }

    public String createCert(String rootSubject, String clientName) {
        var optionalCsr = vaultLocal.retrieveSecret(
                CertificateSigningService.VAULT_CSR_PATH + "/" + serviceName + "/" + clientName);
        if (!optionalCsr.isPresent()) {
            throw new IllegalStateException("Could not find CSR in vault");
        }

        var csrContent = optionalCsr.get();
        var csrPayload = getPayload(csrContent);
        var pem = new String(Base64.getDecoder().decode(csrPayload.getString("csr")));
        var pkcs10CertificationRequest = Serde.pemToCsr(pem);

        var certificateData = CertificateData.withSubject(clientName);

        vaultLocal.retrieveSecret(VAULT_PATH + "/" + serviceName)
                .ifPresentOrElse(secret -> {
                    var payload = getPayload(secret);
                    certificateData.sign(
                            new String(Base64.getDecoder().decode(payload.getString("privateKey"))),
                            new String(Base64.getDecoder().decode(payload.getString("certificate"))),
                            pkcs10CertificationRequest,
                            rootSubject
                    );
                }, () -> {
                    throw new IllegalStateException("Could not find secret in vault");
                });

        var map = new HashMap<String, String>();
        map.put("certificate", Base64.getEncoder().encodeToString(certificateData.certificate().getBytes()));
        vaultLocal.storeSecret(CertificateSigningService.VAULT_CERTIFICATES_PATH + "/" + serviceName + "/" + clientName, map);
        return certificateData.certificate();
    }

    private static JSONObject getPayload(String secret) {
        var secretData = new JSONObject(secret);
        var stage2Secret = (JSONObject) secretData.get("data");
        var payload = (JSONObject) stage2Secret.get("data");
        return payload;
    }
}