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;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WiDAL.CustomCode.WiStep;
using WiDAL.DTOs;

namespace WiBLL.WiStep
{
    public class WiStepBLL : IWiStepBLL
    {
        private readonly IWiStepDAL _dal;
        private readonly AutoNumber _autoNumber;
        private readonly IValidation _validation;

        public WiStepBLL(IWiStepDAL dal, AutoNumber autoNumber, IValidation validation)
        {
            _dal = dal;
            _autoNumber = autoNumber;
            _validation = validation;
        }

        public async Task<string> GetById(int WiStepId, LoginDTO login, CancellationToken ct)
            => await _dal.GetById(WiStepId, login, ct).ConfigureAwait(false);

        public async Task<string> Save(WiStepDTO dto, LoginDTO login, CancellationToken ct)
        {
            if (dto == null) throw new ArgumentNullException(nameof(dto));

            AutoNumberDTO? autoNumberDTO = null;

            try
            {

                bool isNew = dto.WiStepId == 0;

                if (isNew)
                {
                    autoNumberDTO = await _autoNumber.GetNumberAsync(1, "WISTEP", login);

                    dto.WiStepId = autoNumberDTO.StartNumber;
                }

                // ✅ pass isNew to DAL
                await _dal.Save(dto, isNew, login, ct);

                return isNew
                    ? $"{SuccessResponse.SaveSuccess}"
                    : $"{SuccessResponse.UpdateSuccess}";
            }
            catch
            {
                if (autoNumberDTO != null && dto.WiStepId > 0)
                {
                    await _autoNumber.RollbackAutoNumber("WISTEP", dto.WiStepId, login);
                }

                throw;
            }
        }
        public async Task<string> GetSelectListWiStep(CriteriaDTO criteriaDTO, LoginDTO login, CancellationToken ct)
                => await _dal.GetSelectListWiStep(criteriaDTO, login, ct);

        public async Task<string> DeleteWiStep(int WiStepId, LoginDTO loginDTO)
        {
            try
            {
                return await _dal.DeleteWiStep(WiStepId, loginDTO);
            }
            catch (Exception)
            {
                throw;
            }
        }


        public async Task<string> SaveStepWithContent(WiStepDTO dto,LoginDTO login,CancellationToken ct)
        {
            if (dto == null) throw new ArgumentNullException(nameof(dto));

            AutoNumberDTO? stepAutoNumberDTO = null;
            AutoNumberDTO? contentAutoNumberDTO = null;

            try
            {
                bool isNew = dto.WiStepId == 0;

                if (isNew)
                {
                    // WiStepId and WiStepContentId are unrelated PK spaces — reserve each from its
                    // own entity code (was previously one combined "WISTEPEXECUTION" block covering
                    // both, colliding with the real WiStepExecutionId sequence).
                    stepAutoNumberDTO = await _autoNumber.GetNumberAsync(1, "WISTEP", login);
                    dto.WiStepId = stepAutoNumberDTO.StartNumber;

                    if (dto.Contents is { Count: > 0 })
                    {
                        contentAutoNumberDTO = await _autoNumber.GetNumberAsync(dto.Contents.Count, "WISTEPCONTENT", login);
                        int nextContentId = contentAutoNumberDTO.StartNumber;
                        foreach (var content in dto.Contents)
                        {
                            content.WiStepContentId = nextContentId++;
                            content.WiStepId = dto.WiStepId;
                        }
                    }
                }
                else
                {
                    var newContents = dto.Contents?.Where(x => x.WiStepContentId == 0).ToList();

                    if (newContents != null && newContents.Any())
                    {
                        contentAutoNumberDTO = await _autoNumber.GetNumberAsync(newContents.Count,"WISTEPCONTENT",login);

                        int nextId = contentAutoNumberDTO.StartNumber;

                        foreach (var content in newContents)
                        {
                            content.WiStepContentId = nextId++;
                            content.WiStepId = dto.WiStepId;
                        }
                    }
                }

                await _dal.SaveStepWithContent(dto,isNew,login,ct);

                return isNew
                    ? $"{SuccessResponse.SaveSuccess}"
                    : $"{SuccessResponse.UpdateSuccess}";
            }
            catch
            {
                if (stepAutoNumberDTO != null)
                    await _autoNumber.RollbackAutoNumber("WISTEP", stepAutoNumberDTO.StartNumber, login);
                if (contentAutoNumberDTO != null)
                    await _autoNumber.RollbackAutoNumber("WISTEPCONTENT", contentAutoNumberDTO.StartNumber, login);

                throw;
            }
        }
    }
}