using FastEndpoints;
using FrameworkBLL.SchedulerTaskGenerator;
using FrameworkDAL.CustomCode.SchedulerTaskGenerator;
using FrameworkDAL.DTO.SchedulerTaskGenerator;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.FastEndPoint;
using static GB5Shared.GB5Constant.Constant;

namespace FrameworkSL.Endpoints.SchedulerTaskGenerator
{
    /// <summary>
    /// Returns full details for a single scheduler job execution by its ID.
    /// Called internally by the scheduler consumer after picking up a job from the queue.
    /// </summary>
    public sealed class GetSchedulerTaskDetailsEndpoint
        : BaseEndpoint<GetSchedulerTaskDetailsEndpoint.GetSchedulerTaskDetailsParameters, ResponseStandardDTO<object>>
    {
        private readonly ISchedulerTaskServiceBLL _schedulerService;
        private readonly ILoginContextProvider _loginProvider;

        public GetSchedulerTaskDetailsEndpoint(
            ISchedulerTaskServiceBLL schedulerService,
            ILoginContextProvider loginProvider)
        {
            // ✅ Null guards — consistent with other endpoints
            _schedulerService = schedulerService ?? throw new ArgumentNullException(nameof(schedulerService));
            _loginProvider = loginProvider ?? throw new ArgumentNullException(nameof(loginProvider));
        }

        public override void Configure()
        {
            Get("/Scheduler/GetSchedulerTaskDetails");
            AllowAnonymous(); // Internal scheduler call — no user auth required
        }

        public sealed record GetSchedulerTaskDetailsParameters(
            [property: QueryParam] int JobExecutionID,
            [property: FromHeader] string Login
        );

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            GetSchedulerTaskDetailsParameters req,
            LoginDTO loginDTO,
            CancellationToken ct)
        {
            try
            {
                // Fallback to ambient login context if header is absent or incomplete
                if (string.IsNullOrWhiteSpace(loginDTO?.DatabaseName))
                    loginDTO = _loginProvider.GetLogin();

                // ✅ Correctly typed as nullable — BLL interface returns SchedulerTaskDTO?
                SchedulerTaskDTO? task = await _schedulerService.GetTaskDetailsAsync(
                    req.JobExecutionID,
                    loginDTO,
                    ct   // ✅ Forward ct so the DB call respects client cancellation
                );

                // ✅ Explicit null check — return empty/not-found instead of 200 with null payload
                if (task is null)
                    return await GB5Shared.ResponseStandard.Response.CreateEmptyResponse<object>(
                        CacheKeyLevel.USER_LEVEL,
                        $"No scheduler task found for JobExecutionID {req.JobExecutionID}."
                    );

                return await GB5Shared.ResponseStandard.Response.CreateSuccessResponse(
                    task,
                    CacheKeyLevel.USER_LEVEL,
                    loginDTO
                );
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response.CreateExceptionError<object>(
                    ex,
                    CacheKeyLevel.USER_LEVEL,
                    loginDTO,
                    ex.Message,
                    500
                );
            }
        }
    }
}