using FastEndpoints;
using FrameworkBLL.WorkFlow;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.DTO.Framework.ResponseStandard;
using GB5Shared.DTO.WorkFlow;
using GB5Shared.FastEndPoint;
using GB5Shared.WorkFlow.WorkFlowEngine;
using static FrameworkDAL.Constant.Constant;
using static GB5Shared.DTO.WorkFlow.ContractsDTO;

namespace FrameworkSL.Endpoints.WorkFlow
{
    /// <summary>
    /// POST /WorkFlow/CheckApplicability
    ///
    /// Checks whether a workflow applies for the given document context
    /// WITHOUT starting a workflow instance.  Used by front-end to decide
    /// whether to show a "Submit for Approval" button.
    ///
    /// Request body — <see cref="WorkflowCheckContext"/>:
    ///   EntityId              — MENTITY.ENTITYID
    ///   OUId                  — Session OU (-1 = any)
    ///   BizTransactionClassId — (-1 = any)
    ///   BizTransactionId      — (-1 = any)
    ///   Facts                 — DTO field values evaluated against EVALCONDITION
    ///
    /// Response body — <see cref="WorkflowPreCheckResult"/>:
    ///   IsEnabled             — true when a workflow is applicable
    ///   WorkFlowId            — resolved workflow id (0 when none)
    ///   IsFormBasedApproval   — whether ISFORMBASEDAPPROVAL is set in config
    /// </summary>
    public class CheckWorkflowApplicability
        : BaseEndpoint<CheckWorkflowApplicability.CheckApplicabilityParameters,
                       ResponseStandardDTO<object>>
    {
        private readonly IWorkFlowBLL _bll;

        public CheckWorkflowApplicability(IWorkFlowBLL bll) => _bll = bll;

        public override void Configure()
        {
            Post("/WorkFlow/CheckApplicability");
            AllowAnonymous();
        }

        public record CheckApplicabilityParameters(
            [property: FromHeader] string Login,
            [property: FromBody]   WorkflowCheckContext Context
        );

        protected override string? GetCacheKey(
            CheckApplicabilityParameters req, LoginDTO login) => null;

        protected override async Task<ResponseStandardDTO<object>> ExecuteAsync(
            CheckApplicabilityParameters req,
            LoginDTO login,
            CancellationToken ct)
        {
            try
            {
                if (req.Context.OUId == 0)
                    req.Context.OUId = login.WorkOUId;

                var result = await _bll.CheckApplicability(req.Context, login);

                return await GB5Shared.ResponseStandard.Response
                    .CreateSuccessResponse(
                        Newtonsoft.Json.JsonConvert.SerializeObject(result),
                        CacheKeyLevel.NotRequired, login);
            }
            catch (WorkflowEngineException ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NotRequired,
                        login, ex.Message, 400);
            }
            catch (Exception ex)
            {
                return await GB5Shared.ResponseStandard.Response
                    .CreateExceptionError<string>(ex, CacheKeyLevel.NotRequired,
                        login, ex.Message, 500);
            }
        }
    }
}