using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using NHibernate;
using Tanshu.Accounts.Contracts;
using Tanshu.Accounts.Entities;
using Tanshu.Data.DAO;

namespace Tanshu.Accounts.Repository
{
    public class ManagementBI : FluentBasicBase
    {
        public ManagementBI()
            : base()
        { }

        public ManagementBI(bool beginTransaction)
            : base(beginTransaction)
        { }

        public ManagementBI(ISession session)
            : base(session)
        { }

        public ManagementBI(ISession session, bool beginTransaction)
            : base(session, beginTransaction)
        { }

        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 current = GetQuantity(baseCode, startDate, finishDate);
            foreach (var item in list)
            {
                if (current <= quantity)
                    continue;
                foreach (var kot in item.Kots)
                {
                    if (current <= quantity)
                        continue;
                    foreach (var inventory in kot.Inventories)
                    {
                        if (current <= quantity)
                            continue;
                        if (inventory.Product.BaseCode == baseCode)
                        {
                            using (var bi = new InventoryBI())
                            {
                                if (inventory.Quantity * inventory.Product.Quantity > current - quantity)
                                {
                                    current = quantity;
                                    inventory.Quantity = (current - quantity) / inventory.Product.Quantity;
                                    var i = bi.Get(x => x.InventoryID == inventory.InventoryID);
                                    i.Quantity = current - quantity;
                                    bi.Update(i);
                                }
                                else
                                {
                                    current -= inventory.Quantity * inventory.Product.Quantity;
                                    bi.Delete(x => x.InventoryID == inventory.InventoryID);
                                }
                            }
                        }
                    }
                }
            }
            return GetQuantity(baseCode, startDate, finishDate);
        }
        //        public decimal GetBalance(decimal? tax, DateTime startDate, DateTime endDate)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, endDate, connection))
        //                {
        //                    return dao.GetBalance(tax);
        //                }
        //            }
        //        }
        //        public List<Guid> GetUpdateBillList(decimal tax, bool voided, bool paid, bool creditCard, DateTime startDate, DateTime endDate)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, endDate, connection))
        //                {
        //                    return dao.GetUpdateBillList(tax, voided, paid, creditCard);
        //                }
        //            }
        //        }
        //        public decimal Update(Guid voucherID, decimal tax, DateTime startDate, DateTime endDate)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, endDate, connection))
        //                {
        //                    return dao.Update(voucherID, tax);
        //                }
        //            }
        //        }

        //        public void Reorder(DateTime startDate, DateTime endDate, ShowProgessDelegate showProgressDelegate)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, endDate, connection))
        //                {
        //                    dao.Reorder(showProgressDelegate);
        //                }
        //            }
        //        }


        //        public bool MergeData(DateTime startDate, DateTime endDate, string sourceDB, string targetDB)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, endDate, connection))
        //                {
        //                    return dao.MergeData(sourceDB, targetDB);
        //                }
        //            }
        //        }
        //        public List<PendingBills> GetPaidBills(DateTime startDate, DateTime finishDate)
        //        {
        //            GetFactory factory = GetFactory.GetDAOFactory(Database.GetFactoryType);
        //            using (IConnectionDAO connection = factory.Connection)
        //            {
        //                using (IManagementDAO dao = factory.GetManagementDAO(startDate, finishDate, connection))
        //                {
        //                    return dao.GetPaidBills();
        //                }
        //            }
        //        }
        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();
        }
    }
}