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 * Copyright (C) 2026, Leo Galambos
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 *    This product includes software developed by the Egothor project.
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package zeroecho.pki.impl.audit;

import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Objects;
import java.util.logging.Logger;

import zeroecho.pki.api.audit.AuditEvent;
import zeroecho.pki.spi.audit.AuditSink;

/**
 * Reference {@link AuditSink} provider writing a deterministic summary line to
 * standard output.
 *
 * <h2>Security properties</h2>
 * <ul>
 * <li>Does not print {@link AuditEvent#details()} to reduce the risk of secret
 * disclosure.</li>
 * <li>Only prints high-level metadata (time, category, action, principal,
 * purpose).</li>
 * </ul>
 *
 * <h2>Determinism</h2>
 * <p>
 * Timestamp is rendered in ISO-8601 UTC, and the output line layout is stable.
 * </p>
 *
 * <p>
 * This sink is suitable for development and demonstrations. It is not intended
 * as a production persistence backend.
 * </p>
 */
public final class StdoutAuditSink implements AuditSink {

    private static final DateTimeFormatter TS = DateTimeFormatter.ISO_INSTANT.withZone(ZoneOffset.UTC);
    private static final Logger LOG = Logger.getLogger(StdoutAuditSink.class.getName());

    /**
     * Public no-arg constructor required for {@link java.util.ServiceLoader}.
     */
    public StdoutAuditSink() {
        LOG.info("initialized");
    }

    @Override
    public void record(AuditEvent event) {
        Objects.requireNonNull(event, "event");

        String line = TS.format(event.time()) + " category=" + safe(event.category()) + " action="
                + safe(event.action()) + " principalType=" + safe(event.principal().type()) + " principalName="
                + safe(event.principal().name()) + " purpose=" + safe(event.purpose().value());

        System.out.println(line);
    }

    private static String safe(String s) {
        if (s == null) {
            return "";
        }
        return s.replace('\n', ' ').replace('\r', ' ');
    }
}
