using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using Tanshu.Accounts.Contracts;
using Tanshu.Data.DAO;
using Tanshu.Accounts.Entities;
using Tanshu.Accounts.SqlDAO;
using NHibernate.Criterion;
using Tanshu.Accounts.Entities.Auth;
using NHibernate;

namespace Tanshu.Accounts.Repository
{
    public static class VoucherBI
    {
        static public BillInventory GetDefaultSaleBillItem(int productID)
        {
            Product product;
            using (var session = SessionManager.Session)
            {
                product = session.Get<Product>(productID);
                return new BillInventory()
                {
                    ProductID = product.ProductID,
                    Name = product.Units == string.Empty ? product.Name : product.Name + " (" + product.Units + ")",
                    Price = product.SalePrice,
                    Tax = product.Tax.Rate,
                    ServiceCharge = product.ServiceCharge,
                    Discount = 0,
                    Printed = false,
                    Quantity = 1,
                };
            }
        }
        static public decimal GetProductDiscountLimit(int productID)
        {
            using (var session = SessionManager.Session)
            {
                return session.Get<Product>(productID).ProductGroup.DiscountLimit;
            }
        }
        static public bool IsBillPrinted(int voucherID)
        {
            using (var session = SessionManager.Session)
            {
                return session.Get<Voucher>(voucherID).Printed;
            }
        }
        static public int? Insert(Voucher saleVoucher)
        {
            using (var session = SessionManager.Session)
            {
                using (var trans = session.BeginTransaction())
                {
                    DateTime dt = DbValues.Date;
                    saleVoucher.CreationDate = dt;
                    saleVoucher.LastEditDate = dt;
                    saleVoucher.Date = dt;
                    saleVoucher.KotID = DbValues.KotID;
                    if (saleVoucher.Printed)
                        saleVoucher.BillID = DbValues.BillID;
                    else
                        saleVoucher.BillID = saleVoucher.KotID;
                    Kot addedKot = null;
                    foreach (var item in saleVoucher.Kots)
                    {
                        if (item.KotID != 0)
                            continue;
                        addedKot = item;
                        item.Date = dt;
                        item.Printed = true;
                        item.TableID = saleVoucher.TableID;
                        item.User = saleVoucher.User;
                        item.Code = DbValues.KotCode;
                    }
                    session.Save(saleVoucher);
                    using (var ft = new FoodTableBI(session, true))
                    {
                        string status;
                        if (!saleVoucher.Printed)
                            status = "running";
                        else if (saleVoucher.Settled == SettleOption.Unsettled && saleVoucher.Void == false)
                            status = "printed";
                        else
                            status = null;
                        ft.UpdateStatus(saleVoucher.TableID, saleVoucher.VoucherID, status);
                    }
                    trans.Commit();
                    if (addedKot == null)
                        return null;
                    else
                        return addedKot.KotID;

                }
            }
        }
        public static void Delete(int voucherID)
        {
            using (var session = SessionManager.Session)
            {
                using (var trans = session.BeginTransaction())
                {
                    session.Delete(session.Get<Voucher>(voucherID));
                    using (var ft = new FoodTableBI(session, true))
                    {
                        var table = session.QueryOver<FoodTable>()
                                    .Where(x => x.VoucherID == voucherID)
                                    .SingleOrDefault();
                        ft.UpdateStatus(table.Name, voucherID, null);
                    }
                    trans.Commit();
                }
            }
        }

        static public int? Update(Voucher saleVoucher)
        {
            using (var session = SessionManager.Session)
            {
                using (var trans = session.BeginTransaction())
                {
                    DateTime dt = DbValues.Date;
                    saleVoucher.LastEditDate = dt;
                    if (saleVoucher.Date == null)
                    {
                        saleVoucher.Date = dt;
                        saleVoucher.BillID = DbValues.BillID;
                    }
                    if (!saleVoucher.Printed)
                        saleVoucher.Date = dt;
                    Kot addedKot = null;
                    foreach (var item in saleVoucher.Kots)
                    {
                        if (item.KotID != 0)
                            continue;
                        addedKot = item;
                        item.Date = dt;
                        item.Printed = true;
                        item.TableID = saleVoucher.TableID;
                        item.User = saleVoucher.User;
                        item.Code = DbValues.KotCode;
                    }
                    session.Update(saleVoucher);
                    using (var ft = new FoodTableBI(session, true))
                    {
                        string status;
                        if (!saleVoucher.Printed)
                            status = "running";
                        else if (saleVoucher.Settled == SettleOption.Unsettled && saleVoucher.Void == false)
                            status = "printed";
                        else
                            status = null;
                        ft.UpdateStatus(saleVoucher.TableID, saleVoucher.VoucherID, status);
                    }
                    trans.Commit();
                    if (addedKot == null)
                        return null;
                    else
                        return addedKot.KotID;
                }
            }
        }
        static public Voucher GetSaleVoucher(int voucherID)
        {
            using (var session = SessionManager.Session)
            {
                var voucher = session.Get<Voucher>(voucherID);
                NHibernateUtil.Initialize(voucher.Customer);
                NHibernateUtil.Initialize(voucher.Waiter);
                NHibernateUtil.Initialize(voucher.User);
                foreach (var kot in voucher.Kots)
                {
                    NHibernateUtil.Initialize(kot);
                    foreach (var item in kot.Inventories)
                    {
                        NHibernateUtil.Initialize(item);
                        NHibernateUtil.Initialize(item.Product);
                        foreach (var inmod in item.InventoryModifier)
                            NHibernateUtil.Initialize(inmod.Modifier);
                    }
                }
                return voucher;
            }
        }

        static public void VoidBill(int voucherID, string reason)
        {
            using (var session = SessionManager.Session)
            {
                using (var trans = session.BeginTransaction())
                {
                    var saleVoucher = session.Get<Voucher>(voucherID);
                    saleVoucher.Void = true;
                    saleVoucher.VoidReason = reason;
                    session.Save(saleVoucher);
                    using (var ft = new FoodTableBI(session, true))
                    {
                        string status;
                        if (!saleVoucher.Printed)
                            status = "running";
                        else if (saleVoucher.Settled == SettleOption.Unsettled && saleVoucher.Void == false)
                            status = "printed";
                        else
                            status = null;
                        ft.UpdateStatus(saleVoucher.TableID, saleVoucher.VoucherID, status);
                    }

                    trans.Commit();
                }
            }
        }

        static public void SettleVoucher(User user, int voucherID, SettleOption settleOption)
        {
            using (var session = SessionManager.Session)
            {
                using (var trans = session.BeginTransaction())
                {
                    var saleVoucher = session.Get<Voucher>(voucherID);
                    saleVoucher.Settled = (SettleOption)settleOption;
                    saleVoucher.User = user;
                    saleVoucher.LastEditDate = DbValues.Date;
                    session.Update(saleVoucher);
                    var table = session.CreateCriteria<FoodTable>()
                        .Add(Restrictions.Eq("Name", saleVoucher.TableID))
                        .UniqueResult<FoodTable>();
                    table.Status = null;
                    session.Update(table);
                    using (var ft = new FoodTableBI(session, true))
                    {
                        string status;
                        if (!saleVoucher.Printed)
                            status = "running";
                        else if (saleVoucher.Settled == SettleOption.Unsettled && saleVoucher.Void == false)
                            status = "printed";
                        else
                            status = null;
                        ft.UpdateStatus(saleVoucher.TableID, saleVoucher.VoucherID, status);
                    }

                    trans.Commit();
                }
            }
        }
        public static int MoveKot(int kotID, FoodTable foodTable)
        {
            var session = SessionManager.Session;
            using (var trans = session.BeginTransaction())
            {
                var kot = session.Get<Kot>(kotID);
                foodTable = session.Get<FoodTable>(foodTable.FoodTableID);
                var voucher = session.Get<Voucher>(foodTable.VoucherID);
                voucher.Kots.Add(kot);
                session.Update(voucher);
                trans.Commit();
                return voucher.VoucherID;
            }
        }

    }
}