using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using StellaOps.Messaging;
using StellaOps.Messaging.Abstractions;
using StellaOps.Router.Common.Models;
using StellaOps.Router.Transport.Messaging;
using StellaOps.Router.Transport.Messaging.Options;
using StellaOps.Router.Transport.Messaging.Protocol;
using StellaOps.TestKit;
using System.Text.Json;

namespace StellaOps.Router.Common.Tests;

public sealed class MessagingTransportQueueOptionsTests
{
    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task MessagingTransportServer_StartAsync_UsesConfiguredConsumerGroup()
    {
        var options = Options.Create(new MessagingTransportOptions
        {
            ConsumerGroup = "router-gateway-test",
            BatchSize = 1
        });

        var queueFactory = new RecordingQueueFactory();
        var server = new MessagingTransportServer(
            queueFactory,
            options,
            NullLogger<MessagingTransportServer>.Instance);

        await server.StartAsync(CancellationToken.None);
        await server.StopAsync(CancellationToken.None);

        var requestQueue = queueFactory.CreatedQueues.Single(q =>
            q.MessageType == typeof(RpcRequestMessage) &&
            q.Options.QueueName == options.Value.GetGatewayControlQueueName());
        var responseQueue = queueFactory.CreatedQueues.Single(q =>
            q.MessageType == typeof(RpcResponseMessage) &&
            q.Options.QueueName == options.Value.ResponseQueueName);

        requestQueue.Options.ConsumerGroup.Should().Be("router-gateway-test");
        responseQueue.Options.ConsumerGroup.Should().Be("router-gateway-test");
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task MessagingTransportClient_ConnectAsync_UsesConfiguredConsumerGroup()
    {
        var options = Options.Create(new MessagingTransportOptions
        {
            ConsumerGroup = "timelineindexer-test",
            BatchSize = 1
        });

        var queueFactory = new RecordingQueueFactory();
        var client = new MessagingTransportClient(
            queueFactory,
            options,
            NullLogger<MessagingTransportClient>.Instance);

        var instance = new InstanceDescriptor
        {
            InstanceId = "timelineindexer-1",
            ServiceName = "timelineindexer",
            Version = "1.0.0",
            Region = "local"
        };

        await client.ConnectAsync(
            instance,
            [
                new EndpointDescriptor
                {
                    ServiceName = "timelineindexer",
                    Version = "1.0.0",
                    Method = "GET",
                    Path = "/api/v1/timeline"
                }
            ],
            CancellationToken.None);

        await client.DisconnectAsync();

        queueFactory.CreatedQueues.Should().NotBeEmpty();
        queueFactory.CreatedQueues.Should().OnlyContain(q =>
            q.Options.ConsumerGroup == "timelineindexer-test");
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public async Task MessagingTransportClient_ConnectAsync_IncludesSchemasAndOpenApiInfoInHelloPayload()
    {
        var options = Options.Create(new MessagingTransportOptions
        {
            ConsumerGroup = "timelineindexer-test",
            BatchSize = 1
        });

        var queueFactory = new RecordingQueueFactory();
        var client = new MessagingTransportClient(
            queueFactory,
            options,
            NullLogger<MessagingTransportClient>.Instance);

        var instance = new InstanceDescriptor
        {
            InstanceId = "timelineindexer-1",
            ServiceName = "timelineindexer",
            Version = "1.0.0",
            Region = "local"
        };

        var schemaId = "TimelineEvent";
        var schemas = new Dictionary<string, SchemaDefinition>
        {
            [schemaId] = new SchemaDefinition
            {
                SchemaId = schemaId,
                SchemaJson = "{\"type\":\"object\"}",
                ETag = "abc123"
            }
        };

        await client.ConnectAsync(
            instance,
            [
                new EndpointDescriptor
                {
                    ServiceName = "timelineindexer",
                    Version = "1.0.0",
                    Method = "GET",
                    Path = "/api/v1/timeline"
                }
            ],
            schemas,
            new ServiceOpenApiInfo
            {
                Title = "timelineindexer",
                Description = "Timeline service"
            },
            CancellationToken.None);

        await client.DisconnectAsync();

        var helloMessage = queueFactory.EnqueuedMessages
            .OfType<RpcRequestMessage>()
            .First(message => message.FrameType == Common.Enums.FrameType.Hello);

        var payload = JsonSerializer.Deserialize<HelloPayload>(
            Convert.FromBase64String(helloMessage.PayloadBase64),
            new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });

        payload.Should().NotBeNull();
        payload!.Schemas.Should().ContainKey(schemaId);
        payload.Schemas[schemaId].SchemaJson.Should().Be("{\"type\":\"object\"}");
        payload.OpenApiInfo.Should().NotBeNull();
        payload.OpenApiInfo!.Title.Should().Be("timelineindexer");
    }

    [Trait("Category", TestCategories.Unit)]
    [Fact]
    public void MessagingTransportOptions_DefaultControlQueue_DoesNotCollideWithGatewayServiceQueue()
    {
        var options = new MessagingTransportOptions();

        var controlQueue = options.GetGatewayControlQueueName();
        var gatewayServiceQueue = options.GetRequestQueueName("gateway");

        controlQueue.Should().NotBe(gatewayServiceQueue);
        controlQueue.Should().Be("router:requests:gateway-control");
    }

    private sealed class RecordingQueueFactory : IMessageQueueFactory
    {
        public string ProviderName => "test";

        public List<CreatedQueue> CreatedQueues { get; } = new();
        public List<object> EnqueuedMessages { get; } = new();

        public IMessageQueue<TMessage> Create<TMessage>(MessageQueueOptions options)
            where TMessage : class
        {
            CreatedQueues.Add(new CreatedQueue(typeof(TMessage), CloneOptions(options)));
            return new NoOpMessageQueue<TMessage>(options.QueueName, message => EnqueuedMessages.Add(message));
        }

        private static MessageQueueOptions CloneOptions(MessageQueueOptions options)
        {
            return new MessageQueueOptions
            {
                QueueName = options.QueueName,
                ConsumerGroup = options.ConsumerGroup,
                ConsumerName = options.ConsumerName,
                DeadLetterQueue = options.DeadLetterQueue,
                DefaultLeaseDuration = options.DefaultLeaseDuration,
                MaxDeliveryAttempts = options.MaxDeliveryAttempts,
                IdempotencyWindow = options.IdempotencyWindow,
                ApproximateMaxLength = options.ApproximateMaxLength,
                RetryInitialBackoff = options.RetryInitialBackoff,
                RetryMaxBackoff = options.RetryMaxBackoff,
                RetryBackoffMultiplier = options.RetryBackoffMultiplier
            };
        }
    }

    private sealed class NoOpMessageQueue<TMessage> : IMessageQueue<TMessage>
        where TMessage : class
    {
        private readonly Action<TMessage>? _onEnqueue;

        public NoOpMessageQueue(string queueName, Action<TMessage>? onEnqueue = null)
        {
            QueueName = queueName;
            _onEnqueue = onEnqueue;
        }

        public string ProviderName => "test";

        public string QueueName { get; }

        public ValueTask<EnqueueResult> EnqueueAsync(
            TMessage message,
            EnqueueOptions? options = null,
            CancellationToken cancellationToken = default)
        {
            _onEnqueue?.Invoke(message);
            return ValueTask.FromResult(EnqueueResult.Succeeded(Guid.NewGuid().ToString("N")));
        }

        public ValueTask<IReadOnlyList<IMessageLease<TMessage>>> LeaseAsync(
            LeaseRequest request,
            CancellationToken cancellationToken = default)
        {
            return ValueTask.FromResult<IReadOnlyList<IMessageLease<TMessage>>>([]);
        }

        public ValueTask<IReadOnlyList<IMessageLease<TMessage>>> ClaimExpiredAsync(
            ClaimRequest request,
            CancellationToken cancellationToken = default)
        {
            return ValueTask.FromResult<IReadOnlyList<IMessageLease<TMessage>>>([]);
        }

        public ValueTask<long> GetPendingCountAsync(CancellationToken cancellationToken = default)
        {
            return ValueTask.FromResult(0L);
        }
    }

    private sealed record CreatedQueue(Type MessageType, MessageQueueOptions Options);
}