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

namespace Robotico.Nexus.Client.Tests.Graph;

public class NexusGraphStoreTests : IAsyncLifetime
{
    private NexusTestHost _host = null!;
    private NexusClient _client = null!;

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

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

    [Fact]
    public void Open_Succeeds_WhenEngineReachable()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Open("mydb");

        Assert.True(result.IsSuccess(out IGraphSession? session, out _));
        session!.Dispose();
    }

    [Fact]
    public void Open_UsesDefaultDatabaseName_WhenPathBlank()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Open(string.Empty);

        Assert.True(result.IsSuccess(out IGraphSession? session, out _));
        session!.Dispose();
    }

    [Fact]
    public void Open_Fails_WhenPingReportsEngineFailure()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Open(FakeNexusTriggers.PingReportsFailure);

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

    [Fact]
    public void Open_Fails_WhenPingThrowsRpcException()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Open(FakeNexusTriggers.PingThrows);

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

    [Fact]
    public void OpenOrCreate_DelegatesTo_Open()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.OpenOrCreate("greenfield-db");

        Assert.True(result.IsSuccess(out IGraphSession? session, out _));
        session!.Dispose();
    }

    [Fact]
    public void Create_Fails_WithAlreadyExists_WhenPingSucceeds()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Create("already-reachable-db");

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

    [Fact]
    public void Create_Fails_WhenInitialPingReportsFailure()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Create(FakeNexusTriggers.PingReportsFailure);

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

    [Fact]
    public void Create_RegistersInitialLabelsAndEdgeTypes()
    {
        Robotico.Result.Result<IGraphSession> result = _client.Graph.Create(
            "brand-new-db-" + Guid.NewGuid(),
            initialLabels: ["Person", "Company"],
            initialEdgeTypes: ["WorksAt"]);

        // Fake Ping always succeeds for a fresh sentinel-free name, so Create reports AlreadyExists.
        Assert.True(result.IsError(out IError? error));
        Assert.Equal(NexusErrors.AlreadyExists, error!.Code);
    }
}