using Big.Application;
using Big.Domain;

namespace Big.Tests;

// S-10a (#102): the application handler behind the RegistratieVerlopen external-worker job. The 30-day
// document-wait timer fired, so the correlated registration is expired to VERLOPEN. Mirrors
// OpenZaakWorker — pure application logic over ports, idempotent under at-least-once delivery (§8.6).
public class ExpireRegistrationWorkerTests
{
    private const string Bsn = "123456782";

    private static Registration Submitted(string processInstanceId = "proc-1")
    {
        var registration = Registration.Submit(Bsn);
        registration.RecordProcessStarted(processInstanceId);
        return registration;
    }

    [Fact]
    public async Task Expires_the_registration_the_job_correlates_to()
    {
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);

        await new ExpireRegistrationWorker(store).HandleAsync(
            new RegistratieVerlopenJob("job-7", registration.Id));

        var saved = await store.GetAsync(registration.Id);
        Assert.Equal(RegistrationStatus.Verlopen, saved!.Status);
        Assert.Equal(1, store.SaveCount);
    }

    [Fact]
    public async Task An_already_verlopen_registration_is_not_persisted_again()
    {
        // A redelivered job (§8.6) finds the aggregate already VERLOPEN: a no-op, not saved again.
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        registration.Expire();
        store.Seed(registration);

        await new ExpireRegistrationWorker(store).HandleAsync(
            new RegistratieVerlopenJob("job-7", registration.Id));

        Assert.Equal(0, store.SaveCount);
        Assert.Equal(RegistrationStatus.Verlopen, (await store.GetAsync(registration.Id))!.Status);
    }

    [Fact]
    public async Task An_already_resolved_registration_is_left_alone_and_the_job_completes()
    {
        // Race with S-11: the citizen withdrew while parked at WachtOpDocumenten, so the aggregate is
        // already terminal (INGETROKKEN) when the timer's job arrives. Expiring it would violate the
        // aggregate's invariant; the worker must instead no-op (and let the job complete), not throw
        // into a redelivery loop.
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        registration.Withdraw();
        store.Seed(registration);

        await new ExpireRegistrationWorker(store).HandleAsync(
            new RegistratieVerlopenJob("job-7", registration.Id));

        Assert.Equal(0, store.SaveCount);
        Assert.Equal(RegistrationStatus.Ingetrokken, (await store.GetAsync(registration.Id))!.Status);
    }

    [Fact]
    public async Task An_unknown_registration_throws_so_the_job_is_redelivered()
    {
        var store = new FakeRegistrationStore();

        await Assert.ThrowsAsync<InvalidOperationException>(() =>
            new ExpireRegistrationWorker(store).HandleAsync(
                new RegistratieVerlopenJob("job-7", RegistrationId.New())));
    }

    [Fact]
    public async Task Rejects_a_null_job()
        => await Assert.ThrowsAsync<ArgumentNullException>(() =>
            new ExpireRegistrationWorker(new FakeRegistrationStore()).HandleAsync(null!));
}