using System;
using System.Collections.Generic;
using NHibernate;
using NHibernate.Criterion;
using Tanshu.Accounts.Entities;
using System.Linq;

namespace Tanshu.Accounts.Repository
{
    public class FoodTableBI : IDisposable
    {
        private readonly bool _disposeSession;
        private readonly ISession _session;
        private readonly bool _useTransaction;

        public FoodTableBI()
        {
            _session = SessionManager.Session;
            _disposeSession = true;
            _useTransaction = false;
        }

        public FoodTableBI(ISession session)
        {
            this._session = session;
            _disposeSession = false;
            _useTransaction = false;
        }

        public FoodTableBI(ISession session, bool useTransaction)
        {
            this._session = session;
            _disposeSession = false;
            this._useTransaction = useTransaction;
        }

        #region IDisposable Members

        public void Dispose()
        {
            if (_disposeSession)
                _session.Dispose();
        }

        #endregion

        public void Insert(FoodTable foodTable)
        {
            _session.Save(foodTable);
        }

        public void Update(FoodTable foodTable)
        {
            _session.Update(foodTable);
        }

        public void Delete(int foodTableID)
        {
            _session.Delete(new FoodTable {FoodTableID = foodTableID});
        }

        public FoodTable Get(int foodTableID)
        {
            return _session.Get<FoodTable>(foodTableID);
        }

        public FoodTable Get(string name)
        {
            return _session.CreateCriteria<FoodTable>()
                .Add(Restrictions.Eq("Name", name))
                .UniqueResult<FoodTable>();
        }

        public IList<FoodTable> List()
        {
            return _session.CreateCriteria<FoodTable>().List<FoodTable>();
        }

        public void UpdateStatus(string name, int voucherID, string status)
        {
            if (!_useTransaction)
                using (var trans = _session.BeginTransaction())
                {
                    var table = _session.CreateCriteria<FoodTable>()
                        .Add(Restrictions.Eq("Name", name))
                        .UniqueResult<FoodTable>();
                    if (table == null)
                        return;
                    table.VoucherID = string.IsNullOrEmpty(status) ? 0 : voucherID;
                    table.Status = status;
                    _session.Update(table);
                    trans.Commit();
                }
            else
            {
                var table = _session.CreateCriteria<FoodTable>()
                    .Add(Restrictions.Eq("Name", name))
                    .UniqueResult<FoodTable>();
                table.VoucherID = string.IsNullOrEmpty(status) ? 0 : voucherID;
                table.Status = status;
                _session.Update(table);
            }
        }

        public int Move(string name, FoodTable foodTable)
        {
            using (var trans = _session.BeginTransaction())
            {
                var oldTable = _session.CreateCriteria<FoodTable>()
                    .Add(Restrictions.Eq("Name", name))
                    .UniqueResult<FoodTable>();
                foodTable.Status = oldTable.Status;
                foodTable.VoucherID = oldTable.VoucherID;
                oldTable.Status = null;
                oldTable.VoucherID = 0;
                _session.Merge(foodTable);
                _session.Update(oldTable);

                var voucher = _session.Get<Voucher>(foodTable.VoucherID);
                voucher.TableID = foodTable.Name;
                _session.Update(voucher);
                trans.Commit();
                return voucher.VoucherID;
            }
        }

        public void UpdateStatus(Voucher voucher)
        {
                string status;
                if (!voucher.Printed)
                    status = "running";
                else if (voucher.Settlements.Count(x => x.Settled == SettleOption.Unsettled) != 0 && voucher.Void == false)
                    status = "printed";
                else
                    status = null;
                UpdateStatus(voucher.TableID, voucher.VoucherID, status);
        }
    }
}