using Big.Domain;

namespace Big.Application;

/// <summary>
/// The port to the workflow engine. Implemented by the Workflow Client in Infrastructure — the
/// <em>only</em> code that talks to Flowable (CLAUDE.md §8.2). The application asks it to start the
/// registratie process; it never knows Flowable exists.
/// </summary>
public interface IWorkflowClient
{
    /// <summary>
    /// Start one <c>registratie</c> process instance for the given registration, carrying the
    /// registration id so the <c>OpenZaakAanmaken</c> external task can be correlated back to its
    /// aggregate. Returns the process instance id.
    /// </summary>
    Task<string> StartRegistrationProcessAsync(RegistrationId registrationId, CancellationToken ct = default);
}

/// <summary>
/// The port to the Anti-Corruption Layer. Implemented in Infrastructure by an HTTP client to the
/// ACL service — the <em>only</em> code that talks to ZGW (CLAUDE.md §8.1). The domain hands over a
/// bsn; the ACL default-fills the ZGW-mandatory fields (ADR-0003) and returns the created zaak URL.
/// </summary>
public interface IAclClient
{
    /// <summary>Open a zaak for the registration. <paramref name="reference"/> is the registration's
    /// own reference (its id); the ACL records it as the zaak's identificatie so the openbaar register
    /// can show the same reference the zorgprofessional was given (S-09b follow-up, adr-proposal #78).</summary>
    Task<Uri> OpenZaakAsync(string bsn, string reference, CancellationToken ct = default);

    /// <summary>
    /// Record the approval on the given zaak. The ACL translates this to the ZGW concept — setting
    /// the zaak's final status — which OpenZaak notifies over NRC; the domain never names statustypen.
    /// </summary>
    Task ApproveZaakAsync(Uri zaakUrl, CancellationToken ct = default);
}

/// <summary>
/// The port to the behandelaar's user tasks in the workflow engine (S-12). Implemented by the
/// Workflow Client — the only code that talks to Flowable (§8.2). The application lists the open
/// <c>Beoordelen</c> tasks (the werkbak), claims one for a behandelaar, and completes it with the
/// decision; it never names Flowable's REST shapes.
/// </summary>
public interface IUserTaskClient
{
    /// <summary>The werkbak: the <c>Beoordelen</c> tasks awaiting a behandelaar, each with the
    /// registration it belongs to.</summary>
    Task<IReadOnlyList<BeoordelingTask>> GetOpenBeoordelingenAsync(CancellationToken ct = default);

    /// <summary>Claim a beoordeling task for a behandelaar (assigns it to them).</summary>
    Task ClaimAsync(string taskId, string behandelaar, CancellationToken ct = default);

    /// <summary>Complete a beoordeling task, carrying the decision into the process as the
    /// <c>besluit</c> variable so the workflow can continue on the chosen branch.</summary>
    Task CompleteBeoordelingAsync(string taskId, BeoordelingsBesluit besluit, CancellationToken ct = default);
}

/// <summary>A <c>Beoordelen</c> user task in the werkbak: the Flowable task id (needed to claim and
/// complete it) and the registration it carries as a process variable.</summary>
public sealed record BeoordelingTask(string TaskId, RegistrationId RegistrationId);

/// <summary>
/// Persistence port for the <see cref="Registration"/> aggregate. In-memory for the minimal slice
/// (ADR-0009); an EF-backed store is a documented follow-up, and this port keeps that change additive.
/// </summary>
public interface IRegistrationStore
{
    /// <summary>Insert or update the registration, keyed on its id.</summary>
    Task SaveAsync(Registration registration, CancellationToken ct = default);

    /// <summary>Load a registration by id, or <c>null</c> if none exists.</summary>
    Task<Registration?> GetAsync(RegistrationId id, CancellationToken ct = default);
}

/// <summary>
/// An acquired <c>OpenZaakAanmaken</c> external-worker job: the Flowable job id (needed to complete
/// it) and the registration id it carries as a process variable.
/// </summary>
public sealed record OpenZaakJob(string JobId, RegistrationId RegistrationId);