atomic-design-poc/backend/tests/BigRegister.Tests/OpenZaakDocumentSourceTests.cs

using BigRegister.Api.Data;
using BigRegister.Api.Zgw;

namespace BigRegister.Tests;

/// <summary>
/// Exercises the OpenZaak document source against a stub HttpMessageHandler (WP-51): an
/// upload registers a DRC enkelvoudiginformatieobject, and linking to a zaak POSTs a
/// zaakinformatieobject per document once a zaak URL is known.
/// </summary>
public class OpenZaakDocumentSourceTests
{
  private const string DrcBase = "https://oz.example/documenten/api/v1";
  private const string ZrcBase = "https://oz.example/zaken/api/v1";
  private const string ZaaktypeUrl = "https://oz.example/catalogi/api/v1/zaaktypen/zt-registratie";
  private const string InformatieobjecttypeUrl = "https://oz.example/catalogi/api/v1/informatieobjecttypen/iot-identiteit";

  private static ZgwOptions Options() => new()
  {
    DrcBaseUrl = DrcBase,
    ZrcBaseUrl = ZrcBase,
    ClientId = "c",
    Secret = "s",
    Bronorganisatie = "123443210",
    UserRepresentation = "BIG-register BFF",
    InformatieobjecttypeUrls = new() { ["identiteit"] = InformatieobjecttypeUrl },
  };

  [Fact]
  public void Upload_registers_an_eio_in_drc_and_persists_its_url_locally()
  {
    var options = Options();
    var handler = new ZgwStubHandler(url => url switch
    {
      _ when url == $"{DrcBase}/enkelvoudiginformatieobjecten" =>
        """{ "url": "https://oz.example/documenten/api/v1/enkelvoudiginformatieobjecten/eio-1" }""",
      _ => throw new InvalidOperationException($"unexpected ZGW call {url}"),
    });
    var source = new OpenZaakDocumentSource(new HttpClient(handler), new ZgwTokenProvider(options), options);

    var response = source.Upload("local-1", "identiteit", "registratie", "paspoort.pdf", "application/pdf",
        "%PDF-1.4 fake"u8.ToArray(), "111222333");

    Assert.Equal("local-1", response.LocalId);
    Assert.NotEmpty(response.DocumentId);

    // Registered locally too (dual-write, same reasoning as CreateZaak/WP-50) — content
    // preview/download keeps working regardless of Zgw:Enabled.
    var stored = DocumentStore.Get(response.DocumentId);
    Assert.NotNull(stored);
    Assert.Equal("https://oz.example/documenten/api/v1/enkelvoudiginformatieobjecten/eio-1", stored!.DrcUrl);

    var body = handler.BodyOf($"{DrcBase}/enkelvoudiginformatieobjecten");
    Assert.Contains(InformatieobjecttypeUrl, body);
    Assert.Contains("123443210", body);       // bronorganisatie
    Assert.Contains("paspoort.pdf", body);
    Assert.Contains(Convert.ToBase64String("%PDF-1.4 fake"u8.ToArray()), body); // inhoud
  }

  [Fact]
  public void Upload_throws_when_the_category_has_no_configured_informatieobjecttype()
  {
    var options = Options();
    var handler = new ZgwStubHandler(url => throw new InvalidOperationException($"no HTTP call expected, got {url}"));
    var source = new OpenZaakDocumentSource(new HttpClient(handler), new ZgwTokenProvider(options), options);

    Assert.Throws<InvalidOperationException>(() =>
        source.Upload("local-1", "unknown-category", "registratie", "f.pdf", "application/pdf", [1, 2, 3], "111222333"));
  }

  [Fact]
  public void LinkToZaak_posts_a_zaakinformatieobject_per_document_once_a_zaak_exists()
  {
    var options = Options();
    var uploadHandler = new ZgwStubHandler(url =>
        """{ "url": "https://oz.example/documenten/api/v1/enkelvoudiginformatieobjecten/eio-1" }""");
    var uploader = new OpenZaakDocumentSource(new HttpClient(uploadHandler), new ZgwTokenProvider(options), options);
    var doc = uploader.Upload("local-1", "identiteit", "registratie", "paspoort.pdf", "application/pdf", [1, 2, 3], "111222333");

    var linkHandler = new ZgwStubHandler(url => url switch
    {
      _ when url == $"{ZrcBase}/zaakinformatieobjecten" => "{}",
      _ => throw new InvalidOperationException($"unexpected ZGW call {url}"),
    });
    var linker = new OpenZaakDocumentSource(new HttpClient(linkHandler), new ZgwTokenProvider(options), options);

    linker.LinkToZaak([doc.DocumentId], $"{ZrcBase}/zaken/uuid-1");

    var body = linkHandler.BodyOf($"{ZrcBase}/zaakinformatieobjecten");
    Assert.Contains($"{ZrcBase}/zaken/uuid-1", body);
    Assert.Contains("eio-1", body);

    // Local link also happened (dual-write) — the document is now Linked (delete blocked).
    Assert.Equal(DocumentStore.DeleteResult.Linked, DocumentStore.DeleteOwned(doc.DocumentId, "111222333"));
  }

  [Fact]
  public void LinkToZaak_makes_no_zgw_call_when_the_local_source_created_no_zaak()
  {
    var options = Options();
    var handler = new ZgwStubHandler(url => throw new InvalidOperationException($"no HTTP call expected, got {url}"));
    var source = new OpenZaakDocumentSource(new HttpClient(handler), new ZgwTokenProvider(options), options);

    source.LinkToZaak(["some-document-id"], zaakUrl: null);

    Assert.Empty(handler.Requests);
  }
}