using FrameworkDAL.DTO.EIPConversation;
using GB5Shared.DTO.Framework.Login;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace FrameworkBLL.EIPConversation.EIPHandlers.EIPPlayground
{
    /// <summary>
    /// Stateless flow-test facility.
    /// Accepts raw flow JSON + a user message + prior session state,
    /// executes the flow engine in-process without any DB session,
    /// and returns the bot response plus updated session state for
    /// the next round-trip.
    /// </summary>
    public interface IEIPPlaygroundBLL
    {
        Task<PlaygroundRunResponse> RunAsync(
            PlaygroundRunRequest request,
            LoginDTO login,
            CancellationToken ct = default);
    }

    public class PlaygroundRunRequest
    {
        /// <summary>Full flow definition JSON (EIPFlowDefinitionDTO shape).</summary>
        public string FlowJson { get; set; } = string.Empty;

        /// <summary>The user's message for this turn.</summary>
        public string Message { get; set; } = string.Empty;

        /// <summary>
        /// Session state returned from the previous turn.
        /// Null or empty on the first turn — conversation starts from StartStepCode.
        /// </summary>
        public string? SessionStateJson { get; set; }
    }

    public class PlaygroundRunResponse
    {
        public string? ResponseMessage { get; set; }
        public string? CurrentStepCode { get; set; }
        public string? NextStepCode { get; set; }
        public bool IsCompleted { get; set; }
        public string? ErrorMessage { get; set; }
        public List<EIPExecutionPhaseDTO> PhaseTrace { get; set; } = new();

        /// <summary>
        /// Pass this back as SessionStateJson on the next turn.
        /// Empty JSON object "{}" when the conversation is complete.
        /// </summary>
        public string SessionStateJson { get; set; } = "{}";
    }
}