using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using NHibernate;
using Tanshu.Accounts.Entities;
using Tanshu.Common.Helpers;

namespace Tanshu.Accounts.Repository
{
    public class ManagementBI : IUnitOfWork
    {
        protected readonly ISession _session;
        private ITransaction _transaction;

        public ManagementBI()
        {
            _session = SessionManager.Session;
            _transaction = _session.BeginTransaction();
        }
        #region Cleanup
        public void DeleteVoid(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.Void).List();
            foreach (var item in list)
            {
                _session.Delete(item);
                foreach (var re in _session.QueryOver<Reprint>().Where(x => x.Voucher.VoucherID == item.VoucherID).List())
                {
                    _session.Delete(re);
                }
            }
        }
        public void DeleteStaff(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.VoucherType == VoucherType.Staff).List();
            foreach (var item in list)
            {
                _session.Delete(item);
                foreach (var re in _session.QueryOver<Reprint>().Where(x => x.Voucher.VoucherID == item.VoucherID).List())
                {
                    _session.Delete(re);
                }
            }
        }
        public void SetPayments(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate).List();
            foreach (var voucher in list)
            {
                var settlementType = SettleOption.Cash;
                switch (voucher.VoucherType)
                {
                    case VoucherType.NoCharge:
                        settlementType = SettleOption.NoCharge;
                        break;
                    case VoucherType.Staff:
                        settlementType = SettleOption.Staff;
                        break;
                }
                var amount = -1 * voucher.Kots.Sum(x => x.Inventories.Sum(y => y.Amount));
                var roundoff = Math.Round(amount) - amount;
                voucher.Settlements.Clear();
                voucher.Settlements.Add(new VoucherSettlement() { Amount = amount, Settled = SettleOption.Amount });
                voucher.Settlements.Add(new VoucherSettlement() { Amount = roundoff, Settled = SettleOption.RoundOff });
                voucher.Settlements.Add(new VoucherSettlement() { Amount = -1 * (amount + roundoff), Settled = settlementType });
                _session.Update(voucher);
            }
        }
        public void ClearModifiers(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate).List();
            foreach (var voucher in list)
            {
                foreach (var kot in voucher.Kots)
                {
                    foreach (var inventory in kot.Inventories)
                    {
                        if (inventory.InventoryModifier.Count > 0)
                            inventory.InventoryModifier.Clear();
                    }
                }
                _session.Update(voucher);
            }
        }
        public void CombineKots(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate).List();
            foreach (var voucher in list)
            {
                if (voucher.Kots.Count == 0)
                    continue;
                var kots = voucher.Kots.OrderBy(x => x.Date);
                var kot = kots.First();
                for (var kotIndex = kots.Count(); kotIndex > 1; kotIndex--)
                {
                    var otherKot = kots.ElementAt(kotIndex - 1);
                    for (var i = otherKot.Inventories.Count; i > 0; i--)
                    {
                        var inventory = otherKot.Inventories[i - 1];
                        var oldProduct = kot.Inventories.SingleOrDefault(x => x.Product.ProductID == inventory.Product.ProductID);
                        if (oldProduct == null)
                        {
                            inventory.Kot = kot;
                        }
                        else
                        {
                            oldProduct.Quantity += inventory.Quantity;
                            otherKot.Inventories.RemoveAt(i - 1);
                        }
                    }
                }
                _session.Update(voucher);
            }
        }
        public void RemoveBlankKots(DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate).List();
            foreach (var voucher in list)
            {
                for (var kotIndex = voucher.Kots.Count; kotIndex > 0; kotIndex--)
                {
                    var kot = voucher.Kots[kotIndex - 1];
                    if (kot.Inventories.Count == 0)
                        voucher.Kots.RemoveAt(kotIndex - 1);
                }
                _session.Update(voucher);
            }
        }

        public void FinalSanction(DateTime startDate, DateTime finishDate)
        {
            var query = @"
select v.BillID
from Voucher v 
where v.Date < :startDate and v.Void = false and v.VoucherType not in (:nc, :staff)
order by v.Date desc
            ";
            var lastBill = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .SetMaxResults(1)
                .UniqueResult();
            var newID = lastBill == null ? 10001 : GetNewID((int)lastBill);
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.VoucherType != VoucherType.NoCharge && x.VoucherType != VoucherType.Staff && x.Void == false).OrderBy(x => x.Date).Asc.List();
            foreach (var voucher in list)
            {
                if (voucher.BillID != newID)
                {
                    throw new NotImplementedException();
                    //voucher.BillID = newID;
                    _session.Update(voucher);
                }
                newID = GetNewID(newID);
            }

            query = @"
select isnull(v.BillID + 1, 1)
from Voucher v 
where v.Date < :startDate and v.Void = false and v.VoucherType = :nc
order by v.Date desc
            ";
            lastBill = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("nc", VoucherType.NoCharge)
                .SetMaxResults(1)
                .UniqueResult();
            newID = (int)lastBill;
            list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.VoucherType == VoucherType.NoCharge && x.Void == false).OrderBy(x => x.Date).Asc.List();
            foreach (var voucher in list)
            {
                if (voucher.BillID != newID)
                {
                    throw new NotImplementedException();
                    //voucher.BillID = newID;
                    _session.Update(voucher);
                }
                newID += 1;
            }
        }

        private static int GetNewID(int lastBill)
        {
            lastBill += 1;
            if (lastBill % 10000 == 0)
                lastBill += 1;
            return lastBill;
        }

        #endregion
        public void MoveNc(DateTime startDate, DateTime finishDate, decimal target)
        {
            const string query = @"
select v.VoucherID, sum(i.Amount)
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and i.Vat in (.1575, .2625) and v.Void = false and v.VoucherType not in (:nc, :staff)
group by v.VoucherID
order by sum(i.Amount) desc
            ";
            var list = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate.AddHours(7))
                .SetParameter("finishDate", finishDate.AddDays(1).AddHours(7))
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .List();
            var totalAmount = GetFood(.1575M, startDate, finishDate) + GetFood(.2625M, startDate, finishDate);
            var skip = false;
            for (int i = 0; i < list.Count / 20; i++)
            {
                if (target / totalAmount > .75M)
                    break;
                skip = !skip;
                if (skip)
                    continue;
                var item = (object[])list[i];
                var voucherID = (Guid)item[0];
                var amount = (decimal)item[1];
                var voucher = _session.QueryOver<Voucher>().Where(x => x.VoucherID == voucherID).SingleOrDefault();
                voucher.VoucherType = VoucherType.NoCharge;
                _session.Update(voucher);
                totalAmount -= amount;
            }
        }
        public Dictionary<DateTime, decimal> GetLiq(decimal vat, DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end)) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and i.Vat = :vat and v.Void = false and v.VoucherType not in (:nc, :staff)
            ";
            var dict = new Dictionary<DateTime, decimal>();
            for (var date = startDate; date <= finishDate; date = date.AddDays(1))
            {
                var qty = _session
                    .CreateQuery(query)
                    .SetParameter("startDate", date.AddHours(7))
                    .SetParameter("finishDate", date.AddDays(1).AddHours(7))
                    .SetParameter("vat", vat)
                    .SetParameter("nc", VoucherType.NoCharge)
                    .SetParameter("staff", VoucherType.Staff)
                    .UniqueResult();
                dict.Add(date, qty == null ? 0 : (decimal)qty);
            }
            return dict;
        }

        public Dictionary<DateTime, decimal> GetGrossSale(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end)) * (1 + i.Vat) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and v.VoucherType not in (:nc, :staff)
            ";
            var dict = new Dictionary<DateTime, decimal>();
            for (var date = startDate; date <= finishDate; date = date.AddDays(1))
            {
                var qty = _session
                    .CreateQuery(query)
                    .SetParameter("startDate", date.AddHours(7))
                    .SetParameter("finishDate", date.AddDays(1).AddHours(7))
                    .SetParameter("nc", VoucherType.NoCharge)
                    .SetParameter("staff", VoucherType.Staff)
                    .UniqueResult();
                dict.Add(date, qty == null ? 0 : (decimal)qty);
            }
            return dict;
        }

        public decimal GetVat(decimal vat, DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end) * i.Vat) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and i.Vat = :vat and v.Void = false and v.VoucherType not in (:nc, :staff)
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .SetParameter("vat", vat)
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .UniqueResult();
            return qty == null ? 0 : (decimal)qty;
        }

        public decimal GetServiceTax(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end) * i.ServiceTax) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and v.VoucherType not in (:nc, :staff)
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .UniqueResult();
            return qty == null ? 0 : (decimal)qty;
        }
        public string GetFirstBill(DateTime date)
        {
            const string query = @"
select v.BillID
from Voucher v 
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and v.VoucherType not in (:nc, :staff)
order by v.Date
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", date.AddHours(7))
                .SetParameter("finishDate", date.AddDays(1).AddHours(7))
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .SetMaxResults(1)
                .UniqueResult();
            return qty == null ? "" : (string)qty;
        }

        public string GetLastBill(DateTime date)
        {
            const string query = @"
select v.BillID
from Voucher v 
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and v.VoucherType not in (:nc, :staff)
order by v.Date desc
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", date.AddHours(7))
                .SetParameter("finishDate", date.AddDays(1).AddHours(7))
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .SetMaxResults(1)
                .UniqueResult();
            return qty == null ? "" : (string)qty;
        }

        public decimal GetFood(decimal vat, DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * i.Price * (1 - i.Discount) * (1 + case when i.IsScTaxable then i.ServiceCharge else 0 end)) as Amount
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
where v.Date >= :startDate and v.Date <= :finishDate and i.Vat = :vat and v.Void = false and v.VoucherType not in (:nc, :staff)
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .SetParameter("vat", vat)
                .SetParameter("nc", VoucherType.NoCharge)
                .SetParameter("staff", VoucherType.Staff)
                .UniqueResult();
            return qty == null ? 0 : (decimal)qty;
        }
        public decimal SetFood(decimal vat, decimal amount, DateTime startDate, DateTime finishDate)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.Void == false && x.VoucherType != VoucherType.NoCharge && x.VoucherType != VoucherType.Staff).List();
            list = Randomize(list);
            var left = GetFood(vat, startDate, finishDate) - amount;
            foreach (var item in list)
            {
                if (left <= 0)
                    break;
                foreach (var kot in item.Kots)
                {
                    if (left <= 0)
                        break;
                    foreach (var inventory in kot.Inventories)
                    {
                        if (left <= 0)
                            break;
                        if (inventory.VatRate == vat)
                        {
                            var inventoryAmount = inventory.Quantity * inventory.Price * (1 - inventory.Discount) *
                                                  (1 + (inventory.IsScTaxable ? inventory.ServiceCharge : 0));
                            var i = _session.QueryOver<Inventory>().Where(x => x.InventoryID == inventory.InventoryID).SingleOrDefault();
                            if (inventoryAmount > left)
                            {
                                var newQuantity = inventory.Quantity * (inventoryAmount - left) / inventoryAmount;
                                i.Quantity = newQuantity;
                                _session.Update(i);
                                left = 0;
                            }
                            else
                            {
                                left -= inventoryAmount;
                                _session.Delete(i);
                            }
                        }
                    }
                }
            }
            return GetFood(vat, startDate, finishDate);
        }

        public decimal SetLiq(decimal vat, decimal amount, DateTime startDate, DateTime finishDate)
        {
            var rand = new Random();
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.Void == false && x.VoucherType != VoucherType.NoCharge && x.VoucherType != VoucherType.Staff).List();
            list = Randomize(list);

            var left = GetFood(vat, startDate, finishDate) - amount;
            foreach (var item in list)
            {
                if (left <= 0)
                    break;
                foreach (var kot in item.Kots)
                {
                    if (left <= 0)
                        break;
                    foreach (var inventory in kot.Inventories)
                    {
                        if (left <= 0)
                            break;
                        if (inventory.VatRate == vat)
                        {
                            var minimum = inventory.Discount == 0 ? 10 : Convert.ToInt32(inventory.Discount * 100);
                            if (minimum >= 90)
                                continue;
                            var discount = Convert.ToDecimal(rand.Next(minimum, 90)) / 100;
                            if (discount == inventory.Discount)
                                continue;
                            var reduction = inventory.Quantity * inventory.Price *
                                           (1 + (inventory.IsScTaxable ? inventory.ServiceCharge : 0)) *
                                           (discount - inventory.Discount);

                            var i = _session.QueryOver<Inventory>().Where(x => x.InventoryID == inventory.InventoryID).SingleOrDefault();
                            if (reduction > left)
                            {
                                discount = inventory.Quantity * inventory.Price *
                                           (1 + (inventory.IsScTaxable ? inventory.ServiceCharge : 0));
                                discount = left / discount;
                                i.Discount = discount;
                                _session.Update(i);
                                left = 0;
                            }
                            else
                            {
                                i.Discount = discount;
                                _session.Update(i);
                                left -= reduction;
                            }
                        }
                    }
                }
            }
            return GetFood(vat, startDate, finishDate);
        }

        public decimal SetAmount(int vatID, decimal amount, DateTime startDate, DateTime finishDate)
        {
            throw new NotImplementedException();
            //var random = new Random();
            //var list = Randomize(new VoucherBI().List(x => x.Date >= startDate && x.Date <= finishDate && x.Void == false && x.VoucherType != VoucherType.NoCharge && x.VoucherType != VoucherType.Staff));
            //var left = GetFood(vatID, startDate, finishDate) - amount;
            //foreach (var item in list)
            //{
            //    if (left <= 0)
            //        break;
            //    var discount = Convert.ToDecimal(random.Next(20, 70));
            //    discount -= discount % 5;
            //    discount = discount / 100;
            //    foreach (var kot in item.Kots)
            //    {
            //        if (left <= 0)
            //            break;
            //        foreach (var inventory in kot.Inventories)
            //        {
            //            if (left <= 0)
            //                break;
            //            if (inventory.Product.Vat.TaxID == vatID)
            //            {
            //                using (var bi = new InventoryBI())
            //                {
            //                    if (discount < inventory.Discount)
            //                        continue;
            //                    var inventoryAmount = inventory.Quantity * inventory.Price * (1 - inventory.Discount) *
            //                                          (1 + (inventory.IsScTaxable ? inventory.ServiceCharge : 0));
            //                    var reduction = inventory.Quantity * inventory.Price * (discount - inventory.Discount) *
            //                                          (1 + (inventory.IsScTaxable ? inventory.ServiceCharge : 0));
            //                    if (reduction > left)
            //                    {
            //                        var newDiscount = (1 - inventory.Discount) * left / inventoryAmount;
            //                        var i = bi.Get(x => x.InventoryID == inventory.InventoryID);
            //                        i.Discount = newDiscount;
            //                        bi.Update(i);
            //                        left = 0;
            //                    }
            //                    else
            //                    {
            //                        var i = bi.Get(x => x.InventoryID == inventory.InventoryID);
            //                        i.Discount = discount;
            //                        bi.Update(i);
            //                        left -= reduction;
            //                    }
            //                }
            //            }
            //        }
            //    }
            //}
            //return GetFood(vatID, startDate, finishDate);
        }

        public IList GetNcable(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select v.VoucherID, sum(case when p.TaxID = 1 then i.ServiceCharge else 0 end) , sum(i.Quantity * p.Quantity) as Quantity
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
inner join i.Product p
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false
group by p.BaseCode
order by p.BaseCode
            ";
            var list = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .List();
            return list;
        }

        public IList GetMove(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select p.BaseCode, sum(i.Quantity * p.Quantity) as Quantity
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
inner join i.Product p
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and p.BaseCode != 0
group by p.BaseCode
order by p.BaseCode
            ";
            var list = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .List();
            return list;
        }


        #region Beer
        public decimal GetQuantity(DateTime startDate, DateTime finishDate)
        {
            const string query = @"
select sum(i.Quantity * p.Quantity) as Quantity
from Voucher v 
inner join v.Kots k
inner join k.Inventories i
inner join i.Product p
where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and p.Quantity != 0
            ";
            var qty = _session
                .CreateQuery(query)
                .SetParameter("startDate", startDate)
                .SetParameter("finishDate", finishDate)
                .UniqueResult();
            return qty == null ? 0 : (decimal)qty;
        }
        public decimal SetQuantity(DateTime startDate, DateTime finishDate, decimal quantity)
        {
            var list = _session.QueryOver<Voucher>().Where(x => x.Date >= startDate && x.Date <= finishDate && x.Void == false).List();
            list = Randomize(list);
            var left = GetQuantity(startDate, finishDate) - quantity;
            foreach (var item in list)
            {
                if (left <= 0)
                    break;
                foreach (var kot in item.Kots)
                {
                    if (left <= 0)
                        break;
                    foreach (var inventory in kot.Inventories)
                    {
                        if (left <= 0)
                            break;
                        if (inventory.Product.Quantity != 0)
                        {
                            var inventoryQuantity = inventory.Quantity * inventory.Product.Quantity;

                            var i = _session.QueryOver<Inventory>().Where(x => x.InventoryID == inventory.InventoryID).SingleOrDefault();
                            if (inventoryQuantity > left)
                            {
                                var newQuantity = inventory.Quantity * (inventoryQuantity - left) / inventoryQuantity;
                                i.Quantity = newQuantity;
                                _session.Update(i);
                                left = 0;
                            }
                            else
                            {
                                left -= inventoryQuantity;
                                _session.Delete(i);
                            }
                        }
                    }
                }
            }
            return GetQuantity(startDate, finishDate);
        }
        #endregion
        #region Helper and Comments
        private static IList<T> Randomize<T>(IEnumerable<T> list)
        {
            var tList = list.ToArray();
            var rand = new Random();
            for (var i = tList.Length - 1; i > 0; i--)
            {
                var swapIndex = rand.Next(i + 1);
                var tmp = tList[i];
                tList[i] = tList[swapIndex];
                tList[swapIndex] = tmp;
            }
            return tList.ToList();
        }
        //        public decimal GetQuantity(int baseCode, DateTime startDate, DateTime finishDate)
        //        {
        //            const string query = @"
        //select sum(i.Quantity * p.Quantity) as Quantity
        //from Voucher v 
        //inner join v.Kots k
        //inner join k.Inventories i
        //inner join i.Product p
        //where v.Date >= :startDate and v.Date <= :finishDate and v.Void = false and p.BaseCode = :baseCode
        //            ";
        //            var qty = Session
        //                .CreateQuery(query)
        //                .SetParameter("startDate", startDate)
        //                .SetParameter("finishDate", finishDate)
        //                .SetParameter("baseCode", baseCode)
        //                .UniqueResult();
        //            return qty == null ? 0 : (decimal)qty;
        //        }
        //        public decimal SetQuantity(int baseCode, decimal quantity, DateTime startDate, DateTime finishDate)
        //        {
        //            var list = Randomize(new VoucherBI().List(x => x.Date >= startDate && x.Date <= finishDate && x.Void == false));
        //            var left = GetQuantity(baseCode, startDate, finishDate) - quantity;
        //            foreach (var item in list)
        //            {
        //                if (left <= 0)
        //                    break;
        //                foreach (var kot in item.Kots)
        //                {
        //                    if (left <= 0)
        //                        break;
        //                    foreach (var inventory in kot.Inventories)
        //                    {
        //                        if (left <= 0)
        //                            break;
        //                        if (inventory.Product.BaseCode == baseCode)
        //                        {
        //                            using (var bi = new InventoryBI())
        //                            {
        //                                var inventoryQuantity = inventory.Quantity * inventory.Product.Quantity;

        //                                if (inventoryQuantity > left)
        //                                {
        //                                    var newQuantity = inventory.Quantity * (inventoryQuantity - left) / inventoryQuantity;
        //                                    var i = bi.Get(x => x.InventoryID == inventory.InventoryID);
        //                                    i.Quantity = newQuantity;
        //                                    bi.Update(i);
        //                                    left = 0;
        //                                }
        //                                else
        //                                {
        //                                    left -= inventoryQuantity;
        //                                    bi.Delete(x => x.InventoryID == inventory.InventoryID);
        //                                }
        //                            }
        //                        }
        //                    }
        //                }
        //            }
        //            return GetQuantity(baseCode, startDate, finishDate);
        //        }
        //private static int GetNewID(int code, int toBaseCode)
        //{
        //    // Name      Mug, Pit, H H
        //    // Dark      301, 305, 384 // BaseCode = 1
        //    // Wheat     300, 304, 383 // BaseCode = 2
        //    // Premium   299, 303, 382 // BaseCode = 3
        //    // Light     297, 302, 363 // BaseCode = 4
        //    // Dragon    677, 679, 678 // BaseCode = 5 
        //    // Festivals 762  764, 752 // BaseCode = 6
        //    // Festivals 751, 753, 763 // BaseCode = 6
        //    // Festivals 734, 736, 587 // BaseCode = 6
        //    // Festivals 408, 409, 735 // BaseCode = 6
        //    // Strong    697, 708, 707 // BaseCode = 7
        //    var list = new List<int> { 301, 300, 299, 297, 677, 762, 751, 734, 408, 697 };
        //    if (list.Contains(code))
        //    {
        //        if (toBaseCode == 1)
        //            return 301;
        //        if (toBaseCode == 2)
        //            return 300;
        //        if (toBaseCode == 3)
        //            return 299;
        //        if (toBaseCode == 4)
        //            return 297;
        //        if (toBaseCode == 5)
        //            return 677;
        //        if (toBaseCode == 6)
        //            return code;
        //        if (toBaseCode == 7)
        //            return 697;
        //    }
        //    list = new List<int> { 305, 304, 303, 302, 679, 764, 753, 736, 409, 708 };
        //    if (list.Contains(code))
        //    {
        //        if (toBaseCode == 1)
        //            return 305;
        //        if (toBaseCode == 2)
        //            return 304;
        //        if (toBaseCode == 3)
        //            return 303;
        //        if (toBaseCode == 4)
        //            return 302;
        //        if (toBaseCode == 5)
        //            return 679;
        //        if (toBaseCode == 6)
        //            return code;
        //        if (toBaseCode == 7)
        //            return 708;
        //    }
        //    list = new List<int> { 384, 383, 382, 363, 678, 752, 763, 587, 735, 707 };
        //    if (list.Contains(code))
        //    {
        //        if (toBaseCode == 1)
        //            return 384;
        //        if (toBaseCode == 2)
        //            return 383;
        //        if (toBaseCode == 3)
        //            return 382;
        //        if (toBaseCode == 4)
        //            return 363;
        //        if (toBaseCode == 5)
        //            return 678;
        //        if (toBaseCode == 6)
        //            return code;
        //        if (toBaseCode == 7)
        //            return 707;
        //    }

        //    return code;
        //}   
        //public void SetMove(int fromBaseCode, int toBaseCode, DateTime startDate, DateTime finishDate)
        //{
        //    var list = new VoucherBI().List(x => x.Date >= startDate && x.Date <= finishDate);
        //    using (var bi = new InventoryBI())
        //    {
        //        using (var pbi = new ProductBI())
        //        {
        //            foreach (var item in list)
        //            {
        //                foreach (var kot in item.Kots)
        //                {
        //                    foreach (var inventory in kot.Inventories)
        //                    {
        //                        if (inventory.Product.BaseCode == fromBaseCode)
        //                        {
        //                            var i = bi.Get(x => x.InventoryID == inventory.InventoryID);
        //                            i.Product = pbi.Get(x => x.ProductID == GetNewID(i.Product.ProductID, toBaseCode));
        //                            GetNewID(i.InventoryID, toBaseCode);
        //                            bi.Update(i);
        //                        }
        //                    }
        //                }
        //            }
        //        }
        //    }
        //}
        #endregion
        public void Dispose()
        {
            if (_transaction != null)
                _transaction.Rollback();
        }

        public void SaveChanges()
        {
            if (_transaction == null)
                throw new InvalidOperationException("UnitOfWork have already been saved.");

            _transaction.Commit();
            _transaction = null;
        }
    }
}