using Big.Domain;

namespace Big.Application;

/// <summary>A zorgprofessional's signal that they have supplied the documents their registration is
/// waiting for ("documenten aanleveren"). <paramref name="Bsn"/> is the authenticated caller (from the
/// DigiD token, forwarded by the BFF): only the registration's own bsn may provide its documents.</summary>
public sealed record ProvideDocumentsCommand(RegistrationId RegistrationId, string Bsn);

/// <summary>The outcome of a provide-documents request.</summary>
public enum ProvideDocumentsOutcome
{
    /// <summary>The documents were accepted; the process's document wait was completed (if any).</summary>
    Accepted,

    /// <summary>No registration with that id belongs to the caller — unknown, or owned by someone else
    /// (the two are deliberately indistinguishable, so the endpoint reveals neither).</summary>
    NotFound,
}

/// <summary>
/// The provide-documents use case (S-10a): a zorgprofessional supplies the documents their registration
/// is parked waiting for, completing the WachtOpDocumenten task so the registratie process leaves the
/// 30-day wait and continues to beoordeling (ADR-0017). Owner-scoped by bsn. Completing the wait is
/// best-effort: if the registration never started a process (or already left the wait), the request
/// still stands, mirroring how <see cref="WithdrawRegistration"/> cancels best-effort. The actual file
/// upload and its ZGW storage via the ACL is S-10b; this is the trigger that unblocks the process.
/// </summary>
public sealed class ProvideDocuments(IRegistrationStore store, IWorkflowClient workflow)
{
    public async Task<ProvideDocumentsOutcome> HandleAsync(ProvideDocumentsCommand command, CancellationToken ct = default)
    {
        ArgumentNullException.ThrowIfNull(command);

        var registration = await store.GetAsync(command.RegistrationId, ct);

        // Unknown, or not the caller's registration: report NotFound either way (don't reveal which).
        if (registration is null || registration.Bsn != command.Bsn)
            return ProvideDocumentsOutcome.NotFound;

        // Complete the document wait (if a process is running) so beoordeling can proceed.
        if (registration.ProcessInstanceId is not null)
            await workflow.CompleteDocumentWaitAsync(registration.ProcessInstanceId, ct);

        return ProvideDocumentsOutcome.Accepted;
    }
}