/*******************************************************************************
 * Copyright (C) 2026, Leo Galambos
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright notice, this
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 *    This product includes software developed by the Egothor project.
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package zeroecho.pki.util.async;

import java.time.Instant;
import java.util.Objects;

/**
 * Immutable snapshot of an operation's identity and routing metadata.
 *
 * <p>
 * This object intentionally does not contain secrets. Payloads should be stored
 * outside the bus (or referenced indirectly).
 * </p>
 *
 * @param <OpId>       operation identifier type
 * @param <Owner>      operation owner type
 * @param <EndpointId> endpoint identifier type
 * @param opId         operation id (never {@code null})
 * @param type         operation type string (never blank)
 * @param owner        operation owner (never {@code null})
 * @param endpointId   endpoint id (never {@code null})
 * @param createdAt    creation time (never {@code null})
 * @param expiresAt    expiration deadline (never {@code null})
 */
public record AsyncOperationSnapshot<OpId, Owner, EndpointId>(OpId opId, String type, Owner owner,
        EndpointId endpointId, Instant createdAt, Instant expiresAt) {

    /**
     * Creates a snapshot and validates invariants.
     *
     * @throws IllegalArgumentException if required fields are null/blank or expiry
     *                                  is invalid
     */
    public AsyncOperationSnapshot {
        Objects.requireNonNull(opId, "opId");
        Objects.requireNonNull(type, "type");
        Objects.requireNonNull(owner, "owner");
        Objects.requireNonNull(endpointId, "endpointId");
        Objects.requireNonNull(createdAt, "createdAt");
        Objects.requireNonNull(expiresAt, "expiresAt");
        if (type.isBlank()) {
            throw new IllegalArgumentException("type must not be blank");
        }
        if (!expiresAt.isAfter(createdAt)) {
            throw new IllegalArgumentException("expiresAt must be after createdAt");
        }
    }
}
