using GB5Shared.DTO.Framework.AutoNumber;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GenerateAutoNumber;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;
using System.ComponentModel.DataAnnotations;
using System.Text.Json;
using TMSDAL.CustomCode.EvaluationResponse;
using TMSDAL.DTO.Evaluation;
using TMSDAL.DTO.EvaluationInstance;
using TMSDAL.DTO.EvaluationResponse;

namespace TMSBLL.EvaluationResponse
{
    public class EvaluationResponseBLL : IEvaluationResponseBLL
    {
        private readonly IEvaluationResponseDAL _EvaluationResponseDAL;
        private readonly AutoNumber _AutoNumber;
        private readonly IValidation _Validation;

        public EvaluationResponseBLL(
            IEvaluationResponseDAL evaluationResponseDAL,
            AutoNumber autoNumber,
            IValidation validation)
        {
            _EvaluationResponseDAL = evaluationResponseDAL;
            _AutoNumber = autoNumber;
            _Validation = validation;
        }

        public async Task<string> GetEvaluationResponse(int evaluationResponseId, LoginDTO loginDTO)
        {
            try { return await _EvaluationResponseDAL.GetEvaluationResponse(evaluationResponseId, loginDTO); }
            catch (Exception) { throw; }
        }

        public async Task<string> GetEvaluationResponseList(int evaluationInstanceId, LoginDTO loginDTO)
        {
            try { return await _EvaluationResponseDAL.GetEvaluationResponseList(evaluationInstanceId, loginDTO); }
            catch (Exception) { throw; }
        }

        /// <summary>
        /// Submits a response and automatically marks the instance as Completed (EvalStatus = 2).
        /// Responses are immutable — no update after submission.
        /// </summary>
        public async Task<string> SubmitEvaluationResponse(EvaluationResponseDTO dto, LoginDTO loginDTO)
        {
            if (dto == null) throw new ArgumentNullException(nameof(dto));
            AutoNumberDTO? autoNumberDTO = null;
            try
            {
                await _Validation.NotEmpty(dto.EvaluationInstanceId.ToString(), nameof(dto.EvaluationInstanceId));
                await _Validation.NotEmpty(dto.RespondentId.ToString(), nameof(dto.RespondentId));
                await _Validation.NotEmpty(dto.ResponseDataJson, nameof(dto.ResponseDataJson));

                dto.TenantId = loginDTO.ClientId;
                dto.ModifiedById = loginDTO.UserId;
                dto.ModifiedOn = DateTime.UtcNow;
                dto.SubmittedOn = DateTime.UtcNow;
                dto.CreatedById = loginDTO.UserId;
                dto.CreatedOn = DateTime.UtcNow;

                autoNumberDTO = await _AutoNumber.GetAutoNumber(1, "EVALUATIONRESPONSE", loginDTO);
                dto.EvaluationResponseId = autoNumberDTO.StartNumber;

                // Step 1: Save response
                await _EvaluationResponseDAL.SaveEvaluationResponse(dto, loginDTO);

                // Step 2: Mark instance as Completed
                var instanceUpdate = new EvaluationInstanceDTO
                {
                    EvaluationInstanceId = dto.EvaluationInstanceId,
                    EvalStatus = 2, // Completed
                    CompletedAt = DateTime.UtcNow,
                    TenantId = loginDTO.ClientId,
                    ModifiedById = loginDTO.UserId,
                    ModifiedOn = DateTime.UtcNow
                };
                await _EvaluationResponseDAL.UpdateEvaluationInstanceStatus(instanceUpdate, loginDTO);

                var savedJson = await _EvaluationResponseDAL.GetEvaluationResponse(dto.EvaluationResponseId, loginDTO);
                var saved = JsonSerializer.Deserialize<EvaluationResponseDTO>(
                    savedJson, new JsonSerializerOptions { PropertyNameCaseInsensitive = true });

                return string.Format(SuccessResponse.SaveSuccessWithName, saved?.RespondentName);
            }
            catch (ValidationException vex) { throw new Exception(vex.Message); }
            catch (Exception)
            {
                if (autoNumberDTO != null && dto.EvaluationResponseId > 0)
                    await _AutoNumber.RollbackAutoNumber("EVALUATIONRESPONSE", dto.EvaluationResponseId, loginDTO);
                throw;
            }
        }
    }
}