using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using StellaOps.Router.Common.Enums;
using StellaOps.Router.Common.Models;
using StellaOps.Router.Transport.InMemory;
using Xunit;

namespace StellaOps.Router.Transport.InMemory.Tests;

public class HelloHeartbeatFlowTests
{
    private readonly InMemoryConnectionRegistry _registry;
    private readonly InMemoryTransportServer _server;
    private readonly InMemoryTransportClient _client;

    public HelloHeartbeatFlowTests()
    {
        var services = new ServiceCollection();
        services.AddLogging();
        services.AddInMemoryTransport();

        var provider = services.BuildServiceProvider();
        _registry = provider.GetRequiredService<InMemoryConnectionRegistry>();
        _server = provider.GetRequiredService<InMemoryTransportServer>();
        _client = provider.GetRequiredService<InMemoryTransportClient>();
    }

    [Fact]
    public async Task ConnectAsync_SendsHelloAndRegistersEndpoints()
    {
        // Arrange
        var instance = new InstanceDescriptor
        {
            InstanceId = "inst-1",
            ServiceName = "test-service",
            Version = "1.0.0",
            Region = "eu1"
        };

        var endpoints = new List<EndpointDescriptor>
        {
            new()
            {
                ServiceName = "test-service",
                Version = "1.0.0",
                Method = "GET",
                Path = "/api/test"
            }
        };

        // Act
        await _server.StartAsync(CancellationToken.None);
        await _client.ConnectAsync(instance, endpoints, CancellationToken.None);

        // Assert
        Assert.Equal(1, _registry.Count);
        var connections = _registry.GetAllConnections();
        Assert.Single(connections);
        Assert.Equal("test-service", connections[0].Instance.ServiceName);
        Assert.Equal(TransportType.InMemory, connections[0].TransportType);
    }

    [Fact]
    public async Task SendHeartbeatAsync_SendsHeartbeatFrame()
    {
        // Arrange
        var instance = new InstanceDescriptor
        {
            InstanceId = "inst-1",
            ServiceName = "test-service",
            Version = "1.0.0",
            Region = "eu1"
        };

        await _server.StartAsync(CancellationToken.None);
        await _client.ConnectAsync(instance, [], CancellationToken.None);

        var heartbeat = new HeartbeatPayload
        {
            InstanceId = "inst-1",
            Status = InstanceHealthStatus.Healthy
        };

        // Act
        await _client.SendHeartbeatAsync(heartbeat, CancellationToken.None);

        // Allow processing
        await Task.Delay(100);

        // Assert - no exception means heartbeat was sent successfully
        Assert.Equal(1, _registry.Count);
    }

    [Fact]
    public async Task DisconnectAsync_RemovesConnection()
    {
        // Arrange
        var instance = new InstanceDescriptor
        {
            InstanceId = "inst-1",
            ServiceName = "test-service",
            Version = "1.0.0",
            Region = "eu1"
        };

        await _server.StartAsync(CancellationToken.None);
        await _client.ConnectAsync(instance, [], CancellationToken.None);
        Assert.Equal(1, _registry.Count);

        // Act
        await _client.DisconnectAsync();

        // Assert
        Assert.Equal(0, _registry.Count);
    }
}