using GB5Shared.DaprCache;
using GB5Shared.DTO.Framework.AutoNumber;
using GB5Shared.DTO.Framework.Criteria;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GenerateAutoNumber;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;
using System.ComponentModel.DataAnnotations;
using TMSDAL.CustomCode.AssessmentPaper;
using TMSDAL.DTO.AssessmentPaper;
using static GB5Shared.GB5Constant.Constant;

namespace TMSBLL.AssessmentPaper
{
    public class AssessmentPaperBLL : IAssessmentPaperBLL
    {
        private readonly IAssessmentPaperDAL _AssessmentPaperDAL;
        private readonly AutoNumber _AutoNumber;
        private readonly IValidation _Validation;
        private readonly KeyInvalidate _KeyInvalidate;

        public AssessmentPaperBLL(
            IAssessmentPaperDAL assessmentPaperDAL,
            AutoNumber autoNumber,
            IValidation validation,
            KeyInvalidate keyInvalidate)
        {
            _AssessmentPaperDAL = assessmentPaperDAL;
            _AutoNumber = autoNumber;
            _Validation = validation;
            _KeyInvalidate = keyInvalidate;
        }


        // ═══════════════════════════════════════════════════════════════════════
        // GET
        // ═══════════════════════════════════════════════════════════════════════

        public async Task<string> GetAssessmentPaper(int assessmentPaperId, LoginDTO loginDTO)
        {
            try
            {
                return await _AssessmentPaperDAL.GetAssessmentPaper(assessmentPaperId, loginDTO);
            }
            catch (Exception) { throw; }
        }

        public async Task<string> GetAssessmentPaperList(LoginDTO loginDTO)
        {
            try
            {
                return await _AssessmentPaperDAL.GetAssessmentPaperList(loginDTO);
            }
            catch (Exception) { throw; }
        }

        public async Task<string> GetSelectListAssessmentPaper(CriteriaDTO criteriaDTO, LoginDTO loginDTO)
            => await _AssessmentPaperDAL.GetSelectListAssessmentPaper(criteriaDTO, loginDTO);


        // ═══════════════════════════════════════════════════════════════════════
        // SAVE / UPDATE
        // ═══════════════════════════════════════════════════════════════════════

        public async Task<string> SaveAssessmentPaper(AssessmentPaperDTO dto, LoginDTO loginDTO)
        {
            if (dto == null) throw new ArgumentNullException(nameof(dto));
            AutoNumberDTO? autoNumberDTO = null;

            try
            {
                // ── Validations ──────────────────────────────────────────────
                await _Validation.NotEmpty(dto.PaperTitle, nameof(dto.PaperTitle));
                await _Validation.NotEmpty(dto.AssessmentId.ToString(), nameof(dto.AssessmentId));

                string message;

                if (dto.AssessmentPaperId == 0)
                {
                    // ── INSERT ───────────────────────────────────────────────
                    autoNumberDTO = await _AutoNumber.GetAutoNumber(1, "ASSESSMENTPAPER", loginDTO);
                    dto.AssessmentPaperId = autoNumberDTO.StartNumber;

                    await _AssessmentPaperDAL.SaveAssessmentPaper(dto, loginDTO);
                    message = string.Format(SuccessResponse.SaveSuccessWithName, dto.PaperTitle);
                }
                else
                {
                    // ── UPDATE ───────────────────────────────────────────────
                    await _AssessmentPaperDAL.UpdateAssessmentPaper(dto, loginDTO);
                    message = string.Format(SuccessResponse.UpdateSuccessWithName, dto.PaperTitle);
                }

                // ── Cache Invalidation ───────────────────────────────────────
                var cacheKey = new CacheKeyGeneration().KeyGeneration(
                    dto.AssessmentPaperId,
                    EntityConstant.OBJECTASSESSMENTPAPER,
                    CacheKeyLevel.CLIENT_LEVEL,
                    loginDTO);
                await _KeyInvalidate.AllInvalidateCache(cacheKey);

                return message;
            }
            catch (ValidationException vex)
            {
                throw new Exception(vex.Message);
            }
            catch (Exception)
            {
                // ── Rollback AutoNumber on failure ───────────────────────────
                if (autoNumberDTO != null && dto.AssessmentPaperId > 0)
                    await _AutoNumber.RollbackAutoNumber("ASSESSMENTPAPER", dto.AssessmentPaperId, loginDTO);
                throw;
            }
        }


        // ═══════════════════════════════════════════════════════════════════════
        // DELETE
        // ═══════════════════════════════════════════════════════════════════════

        public async Task<string> DeleteAssessmentPaper(int assessmentPaperId, LoginDTO loginDTO)
        {
            try
            {
                var result = await _AssessmentPaperDAL.DeleteAssessmentPaper(assessmentPaperId, loginDTO);

                // ── Cache Invalidation ───────────────────────────────────────
                var cacheKey = new CacheKeyGeneration().KeyGeneration(
                    assessmentPaperId,
                    EntityConstant.OBJECTASSESSMENTPAPER,
                    CacheKeyLevel.CLIENT_LEVEL,
                    loginDTO);
                await _KeyInvalidate.AllInvalidateCache(cacheKey);

                return result;
            }
            catch (Exception) { throw; }
        }
    }
}