using AyCode.Core;
using AyCode.Core.Extensions;
using AyCode.Core.Tests.TestModels;
using AyCode.Services.SignalRs;
using MessagePack.Resolvers;
using Microsoft.AspNetCore.SignalR.Client;

namespace AyCode.Services.Tests.SignalRs;

/// <summary>
/// Testable SignalR client that allows testing without real HubConnection.
/// </summary>
public class TestableSignalRClient : AcSignalRClientBase
{
    private HubConnectionState _connectionState = HubConnectionState.Connected;
    private int? _nextRequestIdOverride;
    
    /// <summary>
    /// Messages sent to the server (captured for assertions).
    /// </summary>
    public List<SentClientMessage> SentMessages { get; } = [];
    
    /// <summary>
    /// Received messages (captured for assertions).
    /// </summary>
    public List<ReceivedClientMessage> ReceivedMessages { get; } = [];

    public TestableSignalRClient(TestLogger logger) : base(logger)
    {
    }

    #region Override virtual methods for testing

    protected override HubConnectionState GetConnectionState() => _connectionState;
    
    protected override bool IsConnected() => _connectionState == HubConnectionState.Connected;

    protected override Task StartConnectionInternal()
    {
        _connectionState = HubConnectionState.Connected;
        return Task.CompletedTask;
    }

    protected override Task StopConnectionInternal()
    {
        _connectionState = HubConnectionState.Disconnected;
        return Task.CompletedTask;
    }

    protected override ValueTask DisposeConnectionInternal() => ValueTask.CompletedTask;

    protected override Task SendToHubAsync(int messageTag, byte[]? messageBytes, int? requestId)
    {
        SentMessages.Add(new SentClientMessage(messageTag, messageBytes, requestId));
        return Task.CompletedTask;
    }

    protected override int GetNextRequestId()
    {
        if (_nextRequestIdOverride.HasValue)
        {
            var id = _nextRequestIdOverride.Value;
            _nextRequestIdOverride = id + 1; // Auto-increment for subsequent calls
            return id;
        }
        return AcDomain.NextUniqueInt32;
    }

    protected override Task MessageReceived(int messageTag, byte[] messageBytes)
    {
        ReceivedMessages.Add(new ReceivedClientMessage(messageTag, messageBytes));
        return Task.CompletedTask;
    }

    #endregion

    #region Public test helpers (wrappers for protected methods)

    /// <summary>
    /// Sets the simulated connection state.
    /// </summary>
    public void SetConnectionState(HubConnectionState state) => _connectionState = state;

    /// <summary>
    /// Sets the next request ID for deterministic testing.
    /// Will auto-increment for subsequent calls.
    /// </summary>
    public void SetNextRequestId(int id) => _nextRequestIdOverride = id;

    /// <summary>
    /// Gets the pending requests dictionary (public wrapper for testing).
    /// </summary>
    public new System.Collections.Concurrent.ConcurrentDictionary<int, SignalRRequestModel> GetPendingRequests() 
        => base.GetPendingRequests();

    /// <summary>
    /// Registers a pending request (public wrapper for testing).
    /// </summary>
    public new void RegisterPendingRequest(int requestId, SignalRRequestModel model)
        => base.RegisterPendingRequest(requestId, model);

    /// <summary>
    /// Clears pending requests (public wrapper for testing).
    /// </summary>
    public new void ClearPendingRequests() => base.ClearPendingRequests();

    /// <summary>
    /// Simulates receiving a response from the server.
    /// </summary>
    public Task SimulateServerResponse(int requestId, int messageTag, SignalResponseStatus status, object? data = null)
    {
        var response = new SignalResponseDataMessage(messageTag, status, data, AcJsonSerializerOptions.Default);
        var bytes = response.ToBinary();
        return OnReceiveMessage(messageTag, bytes, requestId);
    }

    /// <summary>
    /// Simulates receiving a success response from the server.
    /// </summary>
    public Task SimulateSuccessResponse<T>(int requestId, int messageTag, T data)
        => SimulateServerResponse(requestId, messageTag, SignalResponseStatus.Success, data);

    /// <summary>
    /// Simulates receiving an error response from the server.
    /// </summary>
    public Task SimulateErrorResponse(int requestId, int messageTag)
        => SimulateServerResponse(requestId, messageTag, SignalResponseStatus.Error);

    /// <summary>
    /// Gets the last sent message.
    /// </summary>
    public SentClientMessage? LastSentMessage => SentMessages.LastOrDefault();

    /// <summary>
    /// Clears all captured messages.
    /// </summary>
    public void ClearMessages()
    {
        SentMessages.Clear();
        ReceivedMessages.Clear();
    }

    /// <summary>
    /// Invokes OnReceiveMessage directly for testing.
    /// </summary>
    public Task InvokeOnReceiveMessage(int messageTag, byte[] messageBytes, int? requestId)
        => OnReceiveMessage(messageTag, messageBytes, requestId);

    #endregion
}

/// <summary>
/// Represents a message sent from client to server.
/// </summary>
public record SentClientMessage(int MessageTag, byte[]? MessageBytes, int? RequestId)
{
    /// <summary>
    /// Deserializes the message to IdMessage format.
    /// Works with both production SignalPostJsonDataMessage and test SignalRPostMessageDto.
    /// </summary>
    public IdMessage? AsIdMessage()
    {
        if (MessageBytes == null) return null;
        try
        {
            // First deserialize to get the PostDataJson string
            var msg = MessageBytes.MessagePackTo<SignalPostJsonDataMessage<IdMessage>>(ContractlessStandardResolver.Options);
            return msg.PostData;
        }
        catch
        {
            // Fallback: try deserializing as raw JSON wrapper
            try
            {
                var rawMsg = MessageBytes.MessagePackTo<SignalPostJsonMessage>(ContractlessStandardResolver.Options);
                return rawMsg.PostDataJson?.JsonTo<IdMessage>();
            }
            catch
            {
                return null;
            }
        }
    }

    /// <summary>
    /// Deserializes the message to a specific post data type.
    /// </summary>
    public T? AsPostData<T>() where T : class
    {
        if (MessageBytes == null) return null;
        try
        {
            var msg = MessageBytes.MessagePackTo<SignalPostJsonDataMessage<T>>(ContractlessStandardResolver.Options);
            return msg.PostData;
        }
        catch
        {
            // Fallback: try deserializing as raw JSON wrapper
            try
            {
                var rawMsg = MessageBytes.MessagePackTo<SignalPostJsonMessage>(ContractlessStandardResolver.Options);
                return rawMsg.PostDataJson?.JsonTo<T>();
            }
            catch
            {
                return null;
            }
        }
    }
}

/// <summary>
/// Represents a message received by the client.
/// </summary>
public record ReceivedClientMessage(int MessageTag, byte[] MessageBytes)
{
    /// <summary>
    /// Deserializes the message as a response.
    /// </summary>
    public SignalResponseDataMessage? AsResponse()
    {
        try
        {
            return MessageBytes.BinaryTo<SignalResponseDataMessage>();
        }
        catch
        {
            return null;
        }
    }
}