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.WiVersion;
using WiDAL.DTOs;

namespace WiBLL.WiVersion
{
    public class WiVersionBLL : IWiVersionBLL
    {
        private readonly IWiVersionDAL _dal;
        private readonly AutoNumber _autoNumber;
        public WiVersionBLL(IWiVersionDAL dal, AutoNumber autoNumber)
        {
            _dal = dal;
            _autoNumber = autoNumber;
        }

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

        // WI.LWIVERSION is append-only (see WiVersionQB's header comment) — the only legitimate
        // writer is WiMasterDAL.TransitionStatusWithSnapshot, which appends a version row and its
        // matching snapshot in one transaction as part of a real Submit/Approve/Publish/Archive
        // status change. This standalone save previously let a caller hand-create or hand-edit a
        // version-history row outside that flow: it never called CLEAR_PREVIOUS_CURRENT (so two
        // rows could end up ISCURRENT=1), never wrote a matching LWIVERSIONSNAPSHOT row, and
        // returned the wrong LwiVersionId (an unused AutoNumber reservation instead of the real
        // IDENTITY value APPEND_VERSION assigns). Refuse outright rather than fix it in place —
        // there is no legitimate reason to write this table from outside a status transition.
        public Task<string> Save(WiVersionLogDTO dto, LoginDTO login, CancellationToken ct)
            => throw new InvalidOperationException(
                "WI version history is append-only and can only be created via a WI status transition (Submit/Approve/Publish/Archive) — direct save is not supported.");

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

        // Same reasoning as Save — history rows must never be deleted.
        public Task<string> DeleteWiVersion(int WiVersionId, LoginDTO loginDTO)
            => throw new InvalidOperationException("WI version history is append-only and cannot be deleted.");
    }
}