using RecruitmentDAL.DTO.Referral;
using RecruitmentDAL.Query.Referral;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.QueryExecutor;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;
using Newtonsoft.Json;
using System;
using System.Data.Common;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace RecruitmentDAL.CustomeCode.Referral
{
    public class ReferralDAL : IReferralDAL
    {
        private readonly IQueryExecutor _QueryExecutor;
        private readonly IValidation _Validation;

        public ReferralDAL(
            IQueryExecutor queryExecutor,
            IValidation validation)
        {
            _QueryExecutor = queryExecutor;
            _Validation = validation;
        }

        #region Get

        public async Task<string> GetReferral(int ReferralId, LoginDTO LoginDTO, CancellationToken ct)
        {
            try
            {
                string sql = ReferralQB.GET_REFERRAL;
                var parameters = new { ReferralId = ReferralId, TenantId = LoginDTO.ClientId };
                ReferralDTO dto = await _QueryExecutor
                    .QuerySingleAsync<ReferralDTO>(LoginDTO, sql, parameters, cancellationToken: ct)
                    .ConfigureAwait(false);
                return JsonConvert.SerializeObject(dto);
            }
            catch
            {
                throw;
            }
        }

        public async Task<ReferralDTO?> GetLatestPendingReferralByCandidate(int CandidateId, LoginDTO LoginDTO, CancellationToken ct)
        {
            var result = await _QueryExecutor
                .QueryAsync<ReferralDTO>(
                    LoginDTO, ReferralQB.GET_LATEST_PENDING_REFERRAL_BY_CANDIDATE,
                    new { CandidateId = CandidateId, TenantId = LoginDTO.ClientId },
                    cancellationToken: ct)
                .ConfigureAwait(false);
            return result.FirstOrDefault();
        }

        #endregion

        #region Select List

        public async Task<string> GetSelectListReferral(int ReferringEmployeeId, LoginDTO LoginDTO, CancellationToken ct)
        {
            try
            {
                string sql = ReferralQB.GET_SELECTLIST_REFERRAL_BY_EMPLOYEE;
                var parameters = new { ReferringEmployeeId = ReferringEmployeeId, TenantId = LoginDTO.ClientId };
                var result = await _QueryExecutor
                    .QueryAsync<ReferralDTO>(LoginDTO, sql, parameters, cancellationToken: ct)
                    .ConfigureAwait(false);
                return JsonConvert.SerializeObject(result);
            }
            catch
            {
                throw;
            }
        }

        #endregion

        #region Save

        // Called from BaseEntityAppService.ExecuteSaveAsync's persistFunc — must run on the
        // pipeline's own transaction (tx) so validation/workflow/event-publish/outbox all commit
        // or roll back atomically with the insert.
        public async Task<int> SaveReferral(ReferralDTO ReferralDTO, LoginDTO LoginDTO, DbTransaction tx, CancellationToken ct)
        {
            try
            {
                const string sql = ReferralQB.SAVE_REFERRAL;
                return await _QueryExecutor
                    .ExecuteAsync(LoginDTO, sql, ReferralDTO, tx, ct)
                    .ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                string error = await _Validation.HandleException(ex, ErrorResponse.SaveErrorMessage);
                throw new Exception(error);
            }
        }

        #endregion

        #region Update

        public async Task<int> UpdateReferral(ReferralDTO ReferralDTO, LoginDTO LoginDTO, DbTransaction tx, CancellationToken ct)
        {
            try
            {
                const string sql = ReferralQB.UPDATE_REFERRAL;
                return await _QueryExecutor
                    .ExecuteAsync(LoginDTO, sql, ReferralDTO, tx, ct)
                    .ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                string error = await _Validation.HandleException(ex, ErrorResponse.UpdateErrorMessage);
                throw new Exception(error);
            }
        }

        #endregion

        #region Delete

        public async Task<string> DeleteReferral(int ReferralId, LoginDTO LoginDTO, CancellationToken ct)
        {
            try
            {
                string sql = ReferralQB.DELETE_REFERRAL;
                var parameter = new
                {
                    ReferralId = ReferralId,
                    TenantId = LoginDTO.ClientId,
                    ModifiedById = LoginDTO.UserId,
                    ModifiedOn = DateTime.UtcNow
                };

                int result = await _QueryExecutor
                    .ExecuteAsync(LoginDTO, sql, parameter, cancellationToken: ct)
                    .ConfigureAwait(false);

                return result > 0
                    ? SuccessResponse.DeleteSuccessMessage
                    : ErrorResponse.DeleteNotFoundMessage;
            }
            catch (Exception ex)
            {
                string error = await _Validation.HandleException(ex, ErrorResponse.DeleteErrorMessage);
                throw new Exception(error);
            }
        }

        #endregion
    }
}