namespace EventSubscriber.Application;

/// <summary>
/// An inbound NRC (Open Notificaties) notification, as Open Notificaties POSTs it to an
/// abonnement callback. Only the fields the projection needs are modelled.
/// </summary>
/// <remarks>
/// Since S-19b-2 the subscriber listens on the <c>objecten</c> kanaal, not <c>zaken</c>: the
/// register record in Objecten is what the projection is derived from (ADR-0030), so the
/// projection is a cache of the register rather than a re-derivation of the case system. An
/// Objecten notification carries <b>no record data</b> — only the object URL (as both
/// <c>hoofdObject</c> and <c>resourceUrl</c>) and the objecttype as a kenmerk — so the record
/// itself is read back through the ACL.
/// </remarks>
public sealed record Notification(
    string Kanaal,
    string Resource,
    string Actie,
    Uri ResourceUrl,
    Uri? HoofdObject = null)
{
    /// <summary>A register record written to Objecten — <c>create</c> on submit, <c>update</c> on
    /// approval, since the ACL upserts the same object for a registration (§8.6).</summary>
    public bool IsRegisterRecordWritten =>
        Kanaal == "objecten" && Resource == "object" && Actie is "create" or "update";

    /// <summary>The object holding the register record. Objecten sets both fields to the object;
    /// <c>hoofdObject</c> is the main resource by definition, so prefer it.</summary>
    public Uri ObjectUrl => HoofdObject ?? ResourceUrl;
}