using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using GB5Shared.DTO.Framework.AutoNumber;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GenerateAutoNumber;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;
using PayRollDAL.CustomeCode.EmployeeReference;
using PayRollDAL.DTO.EmployeeReference;

namespace PayRollBLL.EmployeeReference
{
    public class EmployeeReferenceBLL : IEmployeeReferenceBLL
    {
        private readonly IEmployeeReferenceDAL _EmployeeReferenceDAL;
        private readonly AutoNumber _AutoNumber;
        private readonly IValidation _Validation;

        public EmployeeReferenceBLL(IEmployeeReferenceDAL IEmployeeReferenceDAL, AutoNumber AutoNumber, IValidation Validation)
        {
            _EmployeeReferenceDAL = IEmployeeReferenceDAL;
            _AutoNumber = AutoNumber;
            _Validation = Validation;
        }

        public async Task<string> SaveEmployeeReference(EmployeeReferenceDTO EmployeeReferenceDTO, LoginDTO LoginDTO)
        {
            if (EmployeeReferenceDTO == null) throw new ArgumentNullException(nameof(EmployeeReferenceDTO));
            AutoNumberDTO? autoNumberDTO = null;

            try
            {
                int count = 1;
                if (EmployeeReferenceDTO.EmployeeReferenceId == 0)
                {
                    autoNumberDTO = await _AutoNumber.GetAutoNumber(count, "EMPLOYEEREFERENCE", LoginDTO);
                    EmployeeReferenceDTO.EmployeeReferenceId = autoNumberDTO.StartNumber;

                    await _EmployeeReferenceDAL.SaveEmployeeReference(EmployeeReferenceDTO, LoginDTO);
                    return $"{SuccessResponse.SaveSuccessMessage} {EmployeeReferenceDTO.EmployeeReferenceId}";
                }
                else
                {
                    await _EmployeeReferenceDAL.UpdateEmployeeReference(EmployeeReferenceDTO, LoginDTO);
                    return $"{SuccessResponse.UpdateSuccessMessage} {EmployeeReferenceDTO.EmployeeReferenceId}";
                }
            }
            catch (ValidationException vex)
            {
                throw new Exception(vex.Message);
            }
            catch (Exception)
            {
                if (autoNumberDTO != null && EmployeeReferenceDTO.EmployeeReferenceId > 0)
                    await _AutoNumber.RollbackAutoNumber("EMPLOYEEREFERENCE", EmployeeReferenceDTO.EmployeeReferenceId, LoginDTO);

                throw;
            }
        }

        public async Task<string> DeleteEmployeeReference(int EmployeeId, LoginDTO LoginDTO)
        {
            try
            {
                return await _EmployeeReferenceDAL.DeleteEmployeeReference(EmployeeId, LoginDTO);
            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}