using Robotico.Nexus.Client.Document;
using Robotico.Nexus.Client.Tests.TestSupport;
using Robotico.Result.Errors;
using Xunit;

namespace Robotico.Nexus.Client.Tests.Document;

public class NexusDocumentClientTests : IAsyncLifetime
{
    private NexusTestHost _host = null!;
    private NexusClient _client = null!;
    private NexusDocumentClient _documentClient = null!;

    public async Task InitializeAsync()
    {
        _host = await NexusTestHost.StartAsync();
        Robotico.Result.Result<NexusClient> connected = NexusClient.Connect(_host.ConnectionUri(NexusUriSchemes.Document));
        Assert.True(connected.IsSuccess(out NexusClient? client, out _));
        _client = client!;
        Robotico.Result.Result<NexusDocumentClient> created = _client.CreateDocumentClient();
        Assert.True(created.IsSuccess(out NexusDocumentClient? documentClient, out _));
        _documentClient = documentClient!;
    }

    public async Task DisposeAsync()
    {
        _client.Dispose();
        await _host.DisposeAsync();
    }

    [Fact]
    public void CheckHealth_Succeeds()
    {
        Robotico.Result.Result result = _documentClient.CheckHealth();

        Assert.True(result.IsSuccess());
    }

    [Fact]
    public void UpsertDocument_ThenGetDocument_RoundTrips()
    {
        Robotico.Result.Result upserted = _documentClient.UpsertDocument("users", "u1", """{"name":"Ada"}""");
        Assert.True(upserted.IsSuccess());

        Robotico.Result.Result<string?> fetched = _documentClient.GetDocument("users", "u1");

        Assert.True(fetched.IsSuccess(out string? body, out _));
        Assert.Equal("""{"name":"Ada"}""", body);
    }

    [Fact]
    public void GetDocument_ReturnsNull_WhenNotFound()
    {
        Robotico.Result.Result<string?> result = _documentClient.GetDocument("users", "missing");

        Assert.True(result.IsSuccess(out string? body, out _));
        Assert.Null(body);
    }

    [Fact]
    public void DeleteDocument_RemovesDocument()
    {
        _documentClient.UpsertDocument("users", "u2", "{}");

        Robotico.Result.Result deleted = _documentClient.DeleteDocument("users", "u2");

        Assert.True(deleted.IsSuccess());
        Robotico.Result.Result<string?> fetched = _documentClient.GetDocument("users", "u2");
        Assert.True(fetched.IsSuccess(out string? body, out _));
        Assert.Null(body);
    }

    [Fact]
    public void DeleteDocument_Succeeds_WhenAlreadyAbsent()
    {
        Robotico.Result.Result result = _documentClient.DeleteDocument("users", "never-existed");

        Assert.True(result.IsSuccess());
    }

    [Fact]
    public void CheckHealth_Fails_WhenEngineReportsFailure()
    {
        Robotico.Result.Result<NexusClient> connected = NexusClient.Connect(
            _host.ConnectionUri(NexusUriSchemes.Document, FakeNexusTriggers.PingReportsFailure));
        Assert.True(connected.IsSuccess(out NexusClient? client, out _));
        using NexusClient failingClient = client!;
        Robotico.Result.Result<NexusDocumentClient> created = failingClient.CreateDocumentClient();
        Assert.True(created.IsSuccess(out NexusDocumentClient? failingDocumentClient, out _));

        Robotico.Result.Result result = failingDocumentClient!.CheckHealth();

        Assert.True(result.IsError(out IError? error));
        Assert.Equal(NexusErrors.Unavailable, error!.Code);
    }
}