narsil/Tanshu.Accounts.PointOfSale/Sales/SalesForm.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Threading;
using System.Windows.Forms;
using Tanshu.Accounts.BI;
using Tanshu.Accounts.Contracts;
using Tanshu.Accounts.Helpers;
using Tanshu.Common;


namespace Tanshu.Accounts.PointOfSale
{
    public partial class SalesForm : Form
    {
        List<Button> buttonList = new List<Button>();
        List<Button> buttonHeads = new List<Button>();
        int page = 0;
        int pageSize = 6;
        #region Billing
        private Dictionary<BillItemKey, SalesBillItemBO> bill = new Dictionary<BillItemKey, SalesBillItemBO>();
        private CustomerBO customer = new CustomerBI().GetCustomer(new Guid("F016CBAD-206C-42C0-BB1D-6006CE57BAB5"));
        #endregion
        private SaleVoucherBO billInfo;
        object lockObject = new object();
        Guid? newBillID;

        public SalesForm()
        {
            InitializeComponent();
            btnCustomer.Text = customer.Name;
            this.Text = Session.User.Name;
        }

        public SalesForm(Guid voucherID)
            : this()
        {
            newBillID = voucherID;
        }

        private void SalesForm_KeyDown(object sender, KeyEventArgs e)
        {
            switch (e.KeyCode)
            {
                case Keys.F2:
                    {
                        if (dgvProducts.Rows.Count > 0)
                            SetQuantity(CurrentProduct, 0, false, true);
                        break;
                    }
                case Keys.F3:
                    {
                        btnDiscount_Click(sender, new EventArgs());
                        break;
                    }
                case Keys.F4:
                    {
                        if (!e.Alt)
                            ShowCustomerList(false);
                        break;
                    }
                case Keys.F5:
                    {
                        btnWaiter_Click(sender, new EventArgs());
                        break;
                    }
                case Keys.F7:
                    {
                        using (SelectProduct selectProduct = new SelectProduct(new ProductBI().GetFilteredProducts, true))
                        {
                            selectProduct.ShowDialog();
                            if (selectProduct.SelectedItem != null)
                                AddProductToGrid(selectProduct.SelectedItem.ProductID);
                        }
                        break;
                    }
                case Keys.F8:
                    {
                        LoadBillFromTable();
                        break;
                    }
                case Keys.F9:
                    {
                        if (dgvProducts.Rows.Count > 0)
                            SetAmount(CurrentProduct, -1);
                        break;
                    }
                case Keys.F11:
                    {
                        btnPrintBill_Click(sender, e);
                        break;
                    }
                case Keys.F12:
                    {
                        btnPrintKot_Click(sender, e);
                        break;
                    }
                case Keys.Delete:
                    {
                        if (dgvProducts.Rows.Count > 0)
                            ProductRemove(CurrentProduct);
                        break;
                    }
                case Keys.Add:
                    {
                        if (dgvProducts.Rows.Count > 0)
                            SetQuantity(CurrentProduct, 1, false, false);
                        break;
                    }
                case Keys.Subtract:
                    {
                        if (dgvProducts.Rows.Count > 0)
                            SetQuantity(CurrentProduct, -1, false, false);
                        break;
                    }
                case Keys.Up:
                    {
                        if ((bindingSource.Position >= 1) && (!dgvProducts.Focused))
                            bindingSource.Position -= 1;
                        break;
                    }
                case Keys.Down:
                    {
                        if ((bindingSource.Position < bindingSource.Count - 1) && (!dgvProducts.Focused))
                            bindingSource.Position += 1;
                        break;
                    }
                case Keys.Escape:
                    {
                        if (bill.Count != 0)
                            if (MessageBox.Show("Cancel current bill?", "Cancel bill", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.No)
                                return;
                        ClearBill();
                        break;
                    }
            }
        }

        #region Helper Functions
        private void ClearBill()
        {
            ShowCustomerList(true);
            this.billInfo = null;
            this.txtBillID.Text = "";
            this.txtKotID.Text = "";
            this.txtCreationDate.Text = "";
            this.txtDate.Text = "";
            this.txtLastEditDate.Text = "";
            this.txtTableID.Text = "";
            this.btnWaiter.Text = "Waiter - F5";
            this.btnWaiter.Tag = null;
            txtGrossTax.Text = "0.00";
            txtDiscount.Text = "0.00";
            txtGrossAmount.Text = "0.00";
            txtAmount.Text = "0.00";
            bill.Clear();
            bindingSource.DataSource = bill.Values;
            ChangeFormState(SaleFormState.Waiting);
        }
        private void AddProductToGrid(Guid productID)
        {
            BillHelperFunctions.AddProductToGrid(productID, bindingSource, bill);
            calculateAmount();
        }

        private void SetQuantity(SalesBillItemBO product, decimal quantity, bool absolute, bool prompt)
        {
            if (product == null)
                return;
            BillHelperFunctions.SetQuantity(product, quantity, absolute, prompt, bindingSource, bill);
            calculateAmount();
        }
        private void SetAmount(SalesBillItemBO product, decimal amount)
        {
            if (product == null)
                return;
            BillHelperFunctions.SetAmount(product, amount, bindingSource, bill);
            calculateAmount();
        }
        private void SetDiscount(SalesBillItemBO product, decimal discount)
        {
            if (product == null)
                return;
            BillHelperFunctions.SetDiscount(product.productID, discount, customer, bill);
            calculateAmount();
            return;
        }
        private bool ProductRemove(SalesBillItemBO product)
        {
            if (product == null)
                return false;
            if (product.Printed > 0)
            {
                if (!Thread.CurrentPrincipal.IsInRole("Sales/EditPrintedProduct"))
                {
                    MessageBox.Show("You are not allowed to delete already printed products");
                    return false;
                }
                if (MessageBox.Show(string.Format("Already {0} items have been printed.\n\rAre you sure you want to delete this item?", product.Printed), "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
                    return false;
                //If BillList(Location).Printed <> 0 Then ItemsDeleted.Add("Deleted " & BillList(Location).Printed & " " & BillList(Location).Name & " from Bill No " & mBillNo)
            }
            bill.Remove(new BillItemKey(product.productID, product.Printed == 0));
            calculateAmount();
            return true;
        }
        private void InputBox_Validating(object sender, InputBoxValidatingArgs e)
        {
        }

        private void productTypeButton_Click(object sender, EventArgs e)
        {
            Button button = sender as Button;
            if (button == null)
                return;
            Guid tag = (Guid)button.Tag;
            ControlFactory.GenerateButtons(ref pnlBilling, ref buttonList, new Rectangle(390, 94, 499, 385), 5, 6, 2, new ProductBI().GetProducts(tag), new ButtonClickDelegate(productButton_Click));
        }
        private void productButton_Click(object sender, EventArgs e)
        {
            Button button = sender as Button;
            if (button == null)
                return;
            Guid tag = (Guid)button.Tag;
            AddProductToGrid(tag);
        }
        private void tableButton_Click(object sender, EventArgs e)
        {
            Button button = sender as Button;
            if (button == null)
                return;
            int tag = (int)button.Tag;
            MessageBox.Show("Table No " + tag.ToString());
            ChangeFormState(SaleFormState.Billing);
            //AddProductToGrid(tag);
        }
        private void calculateAmount()
        {
            txtGrossTax.Text = string.Format("{0:#0.00}", bill.Values.Sum(b => b.TaxAmount));
            txtDiscount.Text = string.Format("{0:#0.00}", bill.Values.Sum(b => b.DiscountAmount));
            txtGrossAmount.Text = string.Format("{0:#0.00}", bill.Values.Sum(b => b.GrossAmount));
            txtAmount.Text = string.Format("{0:#0.00}", Math.Round(bill.Values.Sum(b => b.Value)));
            bindingSource.DataSource = bill.Values.ToList();
            dgvProducts.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.DisplayedCells);
        }

        private void btnPrintBill_Click(object sender, EventArgs e)
        {
            Save(true);
        }
        private void btnPrintKot_Click(object sender, EventArgs e)
        {
            Save(false);
        }
        private void btnMultiPrint_Click(object sender, EventArgs e)
        {
            Save(true);
        }
        private void btnCancel_Click(object sender, EventArgs e)
        {
            if (bill.Count != 0)
                if (MessageBox.Show("Cancel current bill?", "Cancel bill", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.No)
                    return;
            ClearBill();
        }

        private SalesBillItemBO CurrentProduct
        {
            get
            {
                if (dgvProducts.Rows.Count == 0)
                    return null;
                SalesBillItemBO product = bill.ElementAt(dgvProducts.CurrentRow.Index).Value;
                return product;
            }
        }
        private void btnQuantity_Click(object sender, EventArgs e)
        {
            if (dgvProducts.Rows.Count > 0)
                SetQuantity(CurrentProduct, 0, false, true);
        }
        private void btnDiscount_Click(object sender, EventArgs e)
        {
            if (dgvProducts.Rows.Count > 0)
                SetDiscount(CurrentProduct, -1);
        }
        #endregion

        private void SalesForm_Load(object sender, EventArgs e)
        {
            ChangeFormState(SaleFormState.Waiting);
            if (newBillID.HasValue)
            {
                LoadBill(newBillID.Value);
                ChangeFormState(SaleFormState.Billing);
            }
            //ControlFactory.GenerateButtons(ref pnlBilling, new Rectangle(489, 94, 400, 385), 5, 6, 2, new ProductBI().GetUnFilteredProducts(), new ButtonClickDelegate(productButton_Click));
            //ControlFactory.GenerateButtons(ref pnlBilling, ref buttonHeads, new Rectangle(889, 0, 80, 688), 1, pageSize, 2, page, new ProductTypeBI().GetProductTypes(), new ButtonClickDelegate(productTypeButton_Click));
            //ControlFactory.GenerateButtons(ref pnlBilling, ref buttonHeads, new Rectangle(889, 90, 85, 498), 1, pageSize, 2, page, new ProductTypeBI().GetProductTypes(), new ButtonClickDelegate(productTypeButton_Click));
            ControlFactory.GenerateButtons(ref pnlBilling, ref buttonHeads, new Rectangle(390, 94, 499, 385), 6, 10, 2, new FoodTableBI().GetFoodTables(), new ButtonClickDelegate(tableButton_Click));
        }

        private void ChangeFormState(SaleFormState state)
        {
            pnlBilling.Visible = true;
        }

        #region Save Bill
        private void Save(bool print)
        {
            if ((billInfo != null) && (new SaleVoucherBI().IsBillPrinted(billInfo.VoucherID)) && (!Thread.CurrentPrincipal.IsInRole("Sales/EditBill")))
                MessageBox.Show("You are not authorized to access");
            else
            {
                if (bill.Count != 0)
                {
                    Guid? saved;
                    if (billInfo == null)
                        saved = AddNewSale(print);
                    else
                        saved = UpdateSale(print);
                    if (saved.HasValue)
                    {
                        if (newBillID.HasValue)
                            this.Close();
                        else
                            PrintBill(print, saved.Value);
                    }
                    ClearBill();
                }
            }
        }

        private void PrintBill(bool finalBill, Guid voucherID)
        {
            if (!Thread.CurrentPrincipal.IsInRole("Sales/PrintKOT"))
            {
                MessageBox.Show("You are not authorized to access");
                return;
            }
            if (!finalBill)
                Accounts.Print.Thermal.PrintWaiterKot("KOT", voucherID, bill.Values.ToList());
            else
            {
                if (!Thread.CurrentPrincipal.IsInRole("Sales/PrintBill"))
                {
                    MessageBox.Show("You are not authorized to access");
                    return;
                }
                else
                {
                    Accounts.Print.Thermal.PrintBill(Session.printer(), true, voucherID, bill.Values.ToList());
                    Accounts.Print.Thermal.PrintCustomerKot("KOT", voucherID, bill.Values.ToList());
                }
            }
        }
        private Guid? AddNewSale(bool finalBill)
        {
            if (billInfo != null)
            {
                MessageBox.Show("Error in AddNewSale, there is a previous sale in memory", "Error");
                return null;
            }

            if (btnWaiter.Tag == null)
                btnWaiter.Tag = new WaiterBI().GetWaiters()[0].WaiterID;

            #region SaleVoucher
            UserBO user = Session.User;
            SaleVoucherBO saleVoucher = new SaleVoucherBO
            {
                CustomerID = customer.CustomerID,
                Paid = false,
                //Paid = finalBill,
                TableID = txtTableID.Text,
                WaiterID = (Guid)btnWaiter.Tag,
                Printed = finalBill,
                Void = false,
                Date = DateTime.Now,
                Narration = "",
                Ref = "",
                Type = 'S',
                UserID = user.UserID
            };
            #endregion
            #region Inventories
            List<InventoryBO> iList = new SaleVoucherBI().SaleInventory(bill.Values, null);
            #endregion
            new SaleVoucherBI().Insert(saleVoucher, iList);
            return saleVoucher.VoucherID;

        }
        #region TransactionUpdate
        private Guid? UpdateSale(bool finalBill)
        {
            if (btnWaiter.Tag == null)
                btnWaiter.Tag = new WaiterBI().GetWaiters()[0].WaiterID;

            UserBO user = Session.User;
            #region Voucher and SaleVoucher
            SaleVoucherBO saleVoucher = new SaleVoucherBO
            {
                VoucherID = billInfo.VoucherID,
                timestamp = (byte[])billInfo.timestamp,
                UserID = billInfo.UserID,
                Date = billInfo.Date,
                CreationDate = DateTime.Now,
                LastEditDate = DateTime.Now,
                Narration = billInfo.Narration,
                Ref = "",
                Type = 'S',
                Alarm = billInfo.Alarm,
                BillID = billInfo.BillID,
                CustomerID = customer.CustomerID,
                KotID = billInfo.KotID,
                Paid = billInfo.Paid,
                Printed = billInfo.Printed || finalBill,
                TableID = txtTableID.Text,
                Void = billInfo.Void,
                VoidReason = billInfo.VoidReason,
                WaiterID = (Guid)btnWaiter.Tag,
                SaleTimestamp = (byte[])billInfo.SaleTimestamp
            };
            if ((!billInfo.Printed) && finalBill)
                saleVoucher.Date = null;
            #endregion
            #region Inventory
            List<InventoryBO> iList = new SaleVoucherBI().SaleInventory(bill.Values, billInfo.VoucherID);
            #endregion
            new SaleVoucherBI().Update(saleVoucher, iList);
            return saleVoucher.VoucherID;
        }

        #endregion
        #endregion


        private void LoadBillFromTable()
        {
            InputBoxResult result = InputBox.Show("Enter Table Number", "Table", "0", InputBox_Validating);
            if (result.OK)
            {
                txtTableID.Text = result.Text.Trim();
                if ((txtTableID.Text != "C") && (txtTableID.Text != "") && (!txtTableID.Text.Contains(".")))
                {
                    Guid? tID = new SaleVoucherBI().GetPendingVoucherID(txtTableID.Text);
                    if (tID.HasValue)
                    {
                        LoadBill(tID.Value);
                        ChangeFormState(SaleFormState.Billing);
                    }
                }
                else
                    ClearBill();
            }
        }

        private void LoadBill(Guid voucherID)
        {
            ClearBill();
            List<InventoryDisplayBO> iList = new List<InventoryDisplayBO>();
            new SaleVoucherBI().GetSaleVoucher(voucherID, ref billInfo, ref iList);

            this.txtBillID.Text = billInfo.BillID;
            this.txtKotID.Text = billInfo.KotID;
            this.txtCreationDate.Text = billInfo.CreationDate.ToString("HH:mm dd-MMM-yyyy");
            this.txtDate.Text = billInfo.Date.Value.ToString("HH:mm dd-MMM-yyyy");
            this.txtLastEditDate.Text = billInfo.LastEditDate.ToString("HH:mm dd-MMM-yyyy");
            this.customer = new CustomerBI().GetCustomer(billInfo.CustomerID);
            this.btnCustomer.Text = this.customer.Name;
            this.txtTableID.Text = billInfo.TableID;
            this.btnWaiter.Tag = billInfo.WaiterID;
            this.btnWaiter.Text = string.Format("{0} - F5", new WaiterBI().GetWaiter(billInfo.WaiterID).Name);

            foreach (InventoryDisplayBO inventory in iList)
            {
                if (inventory.ComplexProductID.HasValue)
                {
                    BillItemKey key = new BillItemKey(inventory.ComplexProductID.Value, inventory.Quantity == 0);
                    if (!bill.ContainsKey(key))
                    {
                        decimal rate = 0, quantity = 0;
                        string name = "";
                        new SaleVoucherBI().GetComplexBillInformation(voucherID, inventory.ComplexProductID.Value, ref rate, ref quantity, ref name);
                        bill.Add(key, new SalesBillItemBO
                        {
                            productID = inventory.ComplexProductID.Value,
                            Discount = inventory.Discount,
                            Name = name,
                            Price = rate,
                            Printed = quantity,
                            Quantity = quantity,
                            Tax = inventory.Tax,
                        });

                    }
                }
                else
                {
                    BillItemKey key = new BillItemKey(inventory.ProductID, inventory.Quantity == 0);
                    bill.Add(key, new SalesBillItemBO
                    {
                        productID = inventory.ProductID,
                        Discount = inventory.Discount,
                        Name = inventory.ProductName,
                        Price = inventory.Rate,
                        Printed = inventory.Quantity,
                        Quantity = inventory.Quantity,
                        Tax = inventory.Tax,
                    });
                }
            }
            calculateAmount();

        }

        #region Waiting

        private void btnStartBill_Click(object sender, EventArgs e)
        {
            ChangeFormState(SaleFormState.Billing);
        }

        private void btnSelectBill_Click(object sender, EventArgs e)
        {
            if (bsPending.Current != null)
            {
                LoadBill(((PendingBillsBO)bsPending.Current).voucherID);
                ChangeFormState(SaleFormState.Billing);
            }
        }

        private void dgvPending_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            try
            {
                DataGridView dgv = sender as DataGridView;
                PendingBillsBO data = dgv.Rows[e.RowIndex].DataBoundItem as PendingBillsBO;
                if (data.Printed)
                    e.CellStyle.BackColor = Color.LightSlateGray;
            }
            catch
            {
                // Catch and swallow exception when DataGridView attemps to get values for removed rows.
            }
        }

        #endregion

        #region Billing
        private void btnCustomer_Click(object sender, EventArgs e)
        {
            ShowCustomerList(false);
        }

        private void ShowCustomerList(bool reset)
        {
            if ((customer.CustomerID == new Guid("F016CBAD-206C-42C0-BB1D-6006CE57BAB5")) && (!reset))
            {
                using (SelectCustomer selectCustomer = new SelectCustomer(new CustomerBI().GetFilteredCustomers, true))
                {
                    selectCustomer.customerEvent += new CustomerEventHandler(selectCustomer_customerEvent);
                    selectCustomer.ShowDialog();
                    if (selectCustomer.SelectedItem != null)
                    {
                        customer = selectCustomer.SelectedItem;
                        btnCustomer.Text = customer.Name;
                    }
                    else
                    {
                        customer = new CustomerBI().GetCustomer(new Guid("F016CBAD-206C-42C0-BB1D-6006CE57BAB5"));
                    }
                }
            }
            else
            {
                customer = new CustomerBI().GetCustomer(new Guid("F016CBAD-206C-42C0-BB1D-6006CE57BAB5"));
                btnCustomer.Text = customer.Name;
            }
        }

        CustomerBO selectCustomer_customerEvent(object sender, CustomerEventArgs e)
        {
            using (CustomersForm form = new CustomersForm(e.CustomerID, e.Phone))
            {
                form.ShowDialog();
                return form.Customer;
            }
        }

        #endregion


        private void btnVoid_Click(object sender, EventArgs e)
        {
            if (billInfo != null)
            {
                if ((billInfo.Printed) && (!Thread.CurrentPrincipal.IsInRole("Sales/VoidPrintedBill")))
                    MessageBox.Show("Cannot void a paid bill");
                else if (MessageBox.Show("Are you sure you want to void this bill?", "Void Bill", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.Yes)
                {
                    SelectVoidReason voidReason = new SelectVoidReason(GetVoidReason, true);
                    voidReason.ShowDialog();
                    if (voidReason.SelectedItem != null)
                    {
                        new SaleVoucherBI().VoidBill(billInfo.VoucherID, voidReason.SelectedItem.Description);
                        ClearBill();
                    }
                    else
                    {
                        MessageBox.Show("Please Select a reason if you want to void the bill", "Bill NOT Voided", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
                    }
                }
            }
        }

        private List<StringType> GetVoidReason(Dictionary<string, string> filter)
        {
            List<StringType> list = new List<StringType>();
            list.Add(new StringType("Discount"));
            list.Add(new StringType("Printing Fault"));
            list.Add(new StringType("Item Changed"));
            list.Add(new StringType("Quantity Reduced"));
            list.Add(new StringType("Costing Bill for Party"));
            list.Add(new StringType("Cashier Mistake"));
            list.Add(new StringType("Management Freesale"));
            list.Add(new StringType("Other"));
            return list.Where(i => i.Description.ToLower().Contains(filter["Name"].ToLower().Trim())).ToList();
        }
        private void btnRate_Click(object sender, EventArgs e)
        {
            if (!Thread.CurrentPrincipal.IsInRole("Sales/ChangeRate"))
                MessageBox.Show("You are not authorized to access");
            else
            {
                if (dgvProducts.Rows.Count > 0)
                {
                    SalesBillItemBO product = bill.ElementAt(dgvProducts.CurrentRow.Index).Value;
                    decimal rate = 0;
                    InputBoxResult result = InputBox.Show("Enter Rate", "Rate", product.Price.ToString(), InputBox_Validating);
                    if (result.OK)
                        rate = Convert.ToDecimal(result.Text);
                    if (rate != 0)
                    {
                        BillHelperFunctions.SetRate(product.productID, rate, bill);
                        calculateAmount();
                    }
                }
            }
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            ClearBill();
        }

        private void btnAlarm_Click(object sender, EventArgs e)
        {
            if (bsPending.Current != null)
            {
                PendingBillsBO billAlarm = (PendingBillsBO)bsPending.Current;
                InputBoxResult result = InputBox.Show(
                    string.Format("Alarm for Bill {0} Rs. {1}", billAlarm.BillNo, billAlarm.Amount),
                    "Alarm",
                    string.Format("{0:dd-MMM-yyy HH:mm}", billAlarm.LastEdited),
                    InputBox_Validating);
                if (result.OK)
                {
                    DateTime alarmTime;
                    if (result.Text == string.Empty)
                    {
                        new SaleVoucherBI().SetAlarm(billAlarm.voucherID, null);
                        MessageBox.Show("Alarm Cleared", "Alarm Cleared", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else if (DateTime.TryParseExact(result.Text, "dd-MMM-yyyy HH:mm", new CultureInfo("en-US"), DateTimeStyles.None, out alarmTime))
                    {
                        new SaleVoucherBI().SetAlarm(billAlarm.voucherID, alarmTime);
                        MessageBox.Show("Alarm set", "Alarm Set", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                    {
                        MessageBox.Show("Alarm NOT set, please try again", "Alarm NOT Set", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }

        private void dgvProducts_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            DataGridView dgv = sender as DataGridView;
            SalesBillItemBO data = dgv.Rows[e.RowIndex].DataBoundItem as SalesBillItemBO;

            if (data.Printed > 0)
            {
                e.CellStyle.SelectionBackColor = Color.HotPink;
                e.CellStyle.BackColor = Color.LightPink;
            }
            else
            {
                e.CellStyle.SelectionBackColor = Color.Green;
                e.CellStyle.BackColor = Color.LightGreen;
            }
        }

        private void btnWaiter_Click(object sender, EventArgs e)
        {
            using (SelectWaiter selectWaiter = new SelectWaiter(new WaiterBI().GetFilteredWaiters, true))
            {
                selectWaiter.waiterEvent += new WaiterEventHandler(selectWaiter_waiterEvent);
                selectWaiter.ShowDialog();
                if (selectWaiter.SelectedItem != null)
                {
                    btnWaiter.Text = string.Format("{0} - F5", selectWaiter.SelectedItem.Name);
                    btnWaiter.Tag = selectWaiter.SelectedItem.WaiterID;
                }
                else
                {
                    btnWaiter.Text = "Select Waiter - F5";
                    btnWaiter.Tag = new WaiterBI().GetWaiters()[0].WaiterID;
                }
            }
        }
        WaiterBO selectWaiter_waiterEvent(object sender, WaiterEventArgs e)
        {
            WaiterBO waiter = e.Waiter;
            if (!Thread.CurrentPrincipal.IsInRole("Waiter/Master"))
                return waiter;

            switch (e.Action)
            {
                case 1: // Add
                    new WaiterBI().Insert(waiter);
                    e.Handled = true;
                    return waiter;
                case 2: // Edit
                    new WaiterBI().Update(waiter);
                    e.Handled = true;
                    return waiter;
                case 3: // Delete
                    e.Handled = new WaiterBI().Delete(waiter.WaiterID);
                    return new WaiterBI().GetWaiter(1);
                default:
                    throw new ArgumentException();
            }
        }
        #region Dynamic Buttons
        private void btnPrevious_Click(object sender, EventArgs e)
        {
            page--;
            var list = new ProductTypeBI().GetProductTypes();
            if (page == -1)
                page = 0;

            ControlFactory.GenerateButtons(ref pnlBilling, ref buttonHeads, new Rectangle(889, 90, 85, 498), 1, pageSize, 2, page, list, new ButtonClickDelegate(productTypeButton_Click));
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            page++;
            var list = new ProductTypeBI().GetProductTypes();
            int pages = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(list.Count) / Convert.ToDouble(pageSize)));
            if (page == pages)
                page--;

            ControlFactory.GenerateButtons(ref pnlBilling, ref buttonHeads, new Rectangle(889, 90, 85, 498), 1, pageSize, 2, page, list, new ButtonClickDelegate(productTypeButton_Click));
        }
        #endregion
    }
}