using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using FrameworkDAL.CustomCode.Page;
using FrameworkDAL.DTO.Page;
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;

namespace FrameworkBLL.Page
{
    public class PageBLL : IPageBLL
    {
        private readonly IPageDAL _PageDAL;
        private readonly AutoNumber _AutoNumber;
        private readonly IValidation _Validation;

        public PageBLL(IPageDAL IPageDAL, AutoNumber AutoNumber, IValidation Validation)
        {
            _PageDAL = IPageDAL;
            _AutoNumber = AutoNumber;
            _Validation = Validation;
        }

        public async Task<string> GetPage(int PageId, LoginDTO LoginDTO)
        {
            try
            {
                return await _PageDAL.GetPage(PageId, LoginDTO);
            }
            catch (Exception)
            {
                throw;
            }
        }

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

            try
            {
                await _Validation.NotEmpty(PageDTO.PageCode, nameof(PageDTO.PageCode));
                await _Validation.NotEmpty(PageDTO.PageName, nameof(PageDTO.PageName));

                if (PageDTO.DefaultCriteriaConfigId > 0 && !await _PageDAL.CriteriaConfigExists(PageDTO.DefaultCriteriaConfigId, LoginDTO))
                    throw new ArgumentException($"DefaultCriteriaConfigId {PageDTO.DefaultCriteriaConfigId} does not refer to an active criteria config.");

                PageDTO.PageModifiedById = LoginDTO.UserId;
                PageDTO.PageModifiedOn = DateTime.UtcNow;

                int count = 1;
                if (PageDTO.PageId == 0)
                {
                    autoNumberDTO = await _AutoNumber.GetAutoNumber(count, "PAGE", LoginDTO);
                    PageDTO.PageId = autoNumberDTO.StartNumber;
                    PageDTO.PageCreatedById = LoginDTO.UserId;
                    PageDTO.PageCreatedOn = DateTime.UtcNow;

                    await _PageDAL.SavePage(PageDTO, LoginDTO);
                    return $"{SuccessResponse.SaveSuccessMessage} {PageDTO.PageId}";
                }
                else
                {
                    await _PageDAL.UpdatePage(PageDTO, LoginDTO);
                    return $"{SuccessResponse.UpdateSuccessMessage} {PageDTO.PageId}";
                }
            }
            catch (ValidationException vex)
            {
                throw new Exception(vex.Message);
            }
            catch (Exception)
            {
                if (autoNumberDTO != null && PageDTO.PageId > 0)
                    await _AutoNumber.RollbackAutoNumber("PAGE", PageDTO.PageId, LoginDTO);

                throw;
            }
        }

        public async Task<string> DeletePage(int PageId, LoginDTO LoginDTO)
        {
            try
            {
                return await _PageDAL.DeletePage(PageId, LoginDTO);
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<string> GetSelectListPage(CriteriaDTO criteriaDTO, LoginDTO loginDTO)
        {
            try
            {
                return await _PageDAL.GetSelectListPage(criteriaDTO, loginDTO);
            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}