using Big.Application;
using Big.Domain;

namespace Big.Tests;

// S-10a/S-10b (#102/#103): the "documents received" use case. A zorgprofessional supplies the diploma
// their registration is waiting for; the handler stores it in ZGW via the ACL and completes the
// WachtOpDocumenten task via the Workflow Client so the process continues to beoordeling. Owner-scoped
// by the caller's bsn, like WithdrawRegistration.
public class ProvideDocumentsTests
{
    private const string Bsn = "123456782";
    private static readonly Uri Zaak = new("http://openzaak/zaken/api/v1/zaken/abc");

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

    private static readonly byte[] Pdf = "%PDF-1.4 diploma"u8.ToArray();

    private static ProvideDocumentsCommand Command(RegistrationId id, string bsn = Bsn, byte[]? content = null) =>
        new(id, bsn, content ?? Pdf, "diploma.pdf", "application/pdf");

    [Fact]
    public async Task Providing_documents_stores_the_diploma_and_completes_the_wait()
    {
        var store = new FakeRegistrationStore();
        var registration = Submitted("proc-42");
        store.Seed(registration);
        var workflow = new FakeWorkflowClient();
        var acl = new FakeAclClient();
        var handler = new ProvideDocuments(store, workflow, acl, new FakeDocumentScanner());

        var outcome = await handler.HandleAsync(Command(registration.Id));

        Assert.Equal(ProvideDocumentsOutcome.Accepted, outcome);
        // Stored against the registration's zaak, carrying the uploaded bytes + file metadata.
        Assert.Equal((Zaak, Pdf, "diploma.pdf", "application/pdf"), acl.StoredDiploma);
        // …and the wait is completed so beoordeling can proceed.
        Assert.Equal("proc-42", workflow.CompletedDocumentWaitFor);
    }

    [Fact]
    public async Task A_different_bsn_cannot_provide_documents()
    {
        // Owner-scoping: another bsn is told NotFound; nothing is stored or completed.
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);
        var workflow = new FakeWorkflowClient();
        var acl = new FakeAclClient();
        var handler = new ProvideDocuments(store, workflow, acl, new FakeDocumentScanner());

        var outcome = await handler.HandleAsync(Command(registration.Id, bsn: "999999990"));

        Assert.Equal(ProvideDocumentsOutcome.NotFound, outcome);
        Assert.Null(acl.StoredDiploma);
        Assert.Null(workflow.CompletedDocumentWaitFor);
    }

    [Fact]
    public async Task Providing_for_an_unknown_registration_is_not_found()
    {
        var store = new FakeRegistrationStore();
        var handler = new ProvideDocuments(store, new FakeWorkflowClient(), new FakeAclClient(), new FakeDocumentScanner());

        Assert.Equal(ProvideDocumentsOutcome.NotFound, await handler.HandleAsync(Command(RegistrationId.New())));
    }

    [Fact]
    public async Task Providing_before_a_zaak_is_opened_does_not_store_but_still_completes_the_wait()
    {
        // No zaak yet → nothing to file the document against, but the request still stands (best-effort,
        // mirroring WithdrawRegistration). The wait is completed if a process is running.
        var store = new FakeRegistrationStore();
        var registration = Registration.Submit(Bsn);
        registration.RecordProcessStarted("proc-9"); // process started, but no zaak attached
        store.Seed(registration);
        var workflow = new FakeWorkflowClient();
        var acl = new FakeAclClient();
        var handler = new ProvideDocuments(store, workflow, acl, new FakeDocumentScanner());

        var outcome = await handler.HandleAsync(Command(registration.Id));

        Assert.Equal(ProvideDocumentsOutcome.Accepted, outcome);
        Assert.Null(acl.StoredDiploma);
        Assert.Equal("proc-9", workflow.CompletedDocumentWaitFor);
    }

    // S-29 (#192, ADR-0036): only a clean PDF is stored and unblocks beoordeling.
    [Theory]
    [InlineData(ScanVerdict.Infected, ProvideDocumentsOutcome.Infected)]
    [InlineData(ScanVerdict.Unavailable, ProvideDocumentsOutcome.ScannerUnavailable)]
    public async Task A_document_that_does_not_scan_clean_is_refused_and_the_wait_stays_open(
        ScanVerdict verdict, ProvideDocumentsOutcome expected)
    {
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);
        var workflow = new FakeWorkflowClient();
        var acl = new FakeAclClient();
        var handler = new ProvideDocuments(store, workflow, acl, new FakeDocumentScanner(verdict));

        var outcome = await handler.HandleAsync(Command(registration.Id));

        Assert.Equal(expected, outcome);
        Assert.Null(acl.StoredDiploma);
        Assert.Null(workflow.CompletedDocumentWaitFor);
    }

    [Fact]
    public async Task A_file_that_is_not_a_pdf_is_refused_without_being_scanned()
    {
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);
        var workflow = new FakeWorkflowClient();
        var acl = new FakeAclClient();
        var scanner = new FakeDocumentScanner();
        var handler = new ProvideDocuments(store, workflow, acl, scanner);

        var outcome = await handler.HandleAsync(Command(registration.Id, content: "MZ not a pdf"u8.ToArray()));

        Assert.Equal(ProvideDocumentsOutcome.NotAPdf, outcome);
        Assert.Null(scanner.Scanned);
        Assert.Null(acl.StoredDiploma);
        Assert.Null(workflow.CompletedDocumentWaitFor);
    }

    [Fact]
    public async Task A_clean_pdf_is_scanned_before_it_is_stored()
    {
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);
        var scanner = new FakeDocumentScanner();
        var handler = new ProvideDocuments(store, new FakeWorkflowClient(), new FakeAclClient(), scanner);

        await handler.HandleAsync(Command(registration.Id));

        Assert.Equal(Pdf, scanner.Scanned);
    }

    [Fact]
    public async Task A_different_bsn_learns_nothing_about_the_scan()
    {
        // Ownership is checked first: someone else's registration is NotFound even for an infected file.
        var store = new FakeRegistrationStore();
        var registration = Submitted();
        store.Seed(registration);
        var scanner = new FakeDocumentScanner(ScanVerdict.Infected);
        var handler = new ProvideDocuments(store, new FakeWorkflowClient(), new FakeAclClient(), scanner);

        var outcome = await handler.HandleAsync(Command(registration.Id, bsn: "999999990"));

        Assert.Equal(ProvideDocumentsOutcome.NotFound, outcome);
        Assert.Null(scanner.Scanned);
    }

    [Fact]
    public async Task Rejects_a_null_command()
        => await Assert.ThrowsAsync<ArgumentNullException>(() =>
            new ProvideDocuments(new FakeRegistrationStore(), new FakeWorkflowClient(), new FakeAclClient(), new FakeDocumentScanner()).HandleAsync(null!));
}