using System;
using System.ComponentModel.DataAnnotations;
using System.Threading;
using System.Threading.Tasks;
using FrameworkDAL.CustomCode.DashboardPage;
using FrameworkDAL.DTO.Dashboard;
using GB5Shared.DaprCache;
using GB5Shared.DTO.Framework.AutoNumber;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.GenerateAutoNumber;
using GB5Shared.Resource.Response;
using GB5Shared.Validation;

namespace FrameworkBLL.DashboardPage
{
    public class DashboardPageBLL : IDashboardPageBLL
    {
        private readonly IDashboardPageDAL _DashboardPageDAL;
        private readonly AutoNumber _AutoNumber;
        private readonly IValidation _Validation;
        private readonly KeyInvalidate _KeyInvalidate;

        public DashboardPageBLL(IDashboardPageDAL DashboardPageDAL, AutoNumber AutoNumber, IValidation Validation, KeyInvalidate KeyInvalidate)
        {
            _DashboardPageDAL = DashboardPageDAL;
            _AutoNumber = AutoNumber;
            _Validation = Validation;
            _KeyInvalidate = KeyInvalidate;
        }

        public async Task<string> GetDashboardPage(int DashboardId, LoginDTO LoginDTO, CancellationToken ct = default)
        {
            try
            {
                return await _DashboardPageDAL.GetDashboardPage(DashboardId, LoginDTO, ct);
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<string> SaveDashboardPage(DashboardPageDTO DashboardPageDTO, LoginDTO LoginDTO, CancellationToken ct = default)
        {
            if (DashboardPageDTO == null) throw new ArgumentNullException(nameof(DashboardPageDTO));
            AutoNumberDTO? autoNumberDTO = null;

            try
            {
                if (DashboardPageDTO.DashboardId == 0)
                    throw new ArgumentException("DashboardId is required.");
                if (DashboardPageDTO.PageId == 0)
                    throw new ArgumentException("PageId is required.");

                string result;
                if (DashboardPageDTO.DashboardPageId == 0)
                {
                    autoNumberDTO = await _AutoNumber.GetAutoNumber(1, "DASHBOARDPAGE", LoginDTO);
                    DashboardPageDTO.DashboardPageId = autoNumberDTO.StartNumber;

                    await _DashboardPageDAL.SaveDashboardPage(DashboardPageDTO, LoginDTO, ct);
                    result = $"{SuccessResponse.SaveSuccessMessage} {DashboardPageDTO.DashboardPageId}";
                }
                else
                {
                    await _DashboardPageDAL.UpdateDashboardPage(DashboardPageDTO, LoginDTO, ct);
                    result = $"{SuccessResponse.UpdateSuccessMessage} {DashboardPageDTO.DashboardPageId}";
                }

                // GetDashboardListForUser embeds each Dashboard's Pages[] and is cached at
                // USER_LEVEL — see DashboardBLL's matching note for why a full flush
                // (rather than a precisely-targeted key) is used for this class of write.
                await _KeyInvalidate.AllInvalidateCache("-1").ConfigureAwait(false);
                return result;
            }
            catch (ValidationException vex)
            {
                throw new Exception(vex.Message);
            }
            catch (Exception)
            {
                if (autoNumberDTO != null && DashboardPageDTO.DashboardPageId > 0)
                    await _AutoNumber.RollbackAutoNumber("DASHBOARDPAGE", DashboardPageDTO.DashboardPageId, LoginDTO);

                throw;
            }
        }

        public async Task<string> DeleteDashboardPage(int DashboardPageId, LoginDTO LoginDTO, CancellationToken ct = default)
        {
            try
            {
                var result = await _DashboardPageDAL.DeleteDashboardPage(DashboardPageId, LoginDTO, ct);
                await _KeyInvalidate.AllInvalidateCache("-1").ConfigureAwait(false);
                return result;
            }
            catch (Exception)
            {
                throw;
            }
        }

        public async Task<string> DeleteDashboardPageWithDashboardAndPage(int DashboardId, int PageId, LoginDTO LoginDTO, CancellationToken ct = default)
        {
            try
            {
                var result = await _DashboardPageDAL.DeleteDashboardPageWithDashboardAndPage(DashboardId, PageId, LoginDTO, ct);
                await _KeyInvalidate.AllInvalidateCache("-1").ConfigureAwait(false);
                return result;
            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}