using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Tanshu.Accounts.Repository;
using Tanshu.Accounts.Helpers;
using Tanshu.Accounts.Contracts;
using System.Windows.Forms;
using Tanshu.Common;
using Tanshu.Accounts.Entities;
using Tanshu.Accounts.Entities.Auth;
using Tanshu.Accounts.SqlDAO;
using System.Collections.ObjectModel;


namespace Tanshu.Accounts.PointOfSale
{
    public class BillController
    {
        private SaleVoucher billInfo;
        private OrderedDictionary<BillItemKey, BillInventory> bill = new OrderedDictionary<BillItemKey, BillInventory>();
        int? editVoucherID;

        ISaleForm saleForm;
        private Customer customer = new CustomerBI().GetCustomer(1);
        public BillController(int? editVoucherID)
        {
            this.editVoucherID = editVoucherID;
        }
        public void InitGui(ISaleForm saleForm)
        {
            this.saleForm = saleForm;
            this.saleForm.SetCustomerDisplay(customer.Name);
            this.saleForm.SetUserName(Session.User.Name);

        }
        private void InitComponents()
        {
            InitModel();
            InitView();
        }

        private void InitView()
        {
            throw new NotImplementedException();
        }

        private void InitModel()
        {
            throw new NotImplementedException();
        }
        public void AddProductToGrid(int productID)
        {
            new BillHelperFunctions(saleForm.BindingSource, bill, productID).AddProduct();
            Product product = ProductBI.GetProduct(productID);
            if (ProductGroupModifierBI.HasCompulsoryModifier(product.ProductGroup.ProductGroupID))
            {
                var item = CurrentProduct;
                ShowModifiers(product.ProductGroup.ProductGroupID, item);
            }
            ShowAmount();
        }

        public void ShowModifiers(int productGroupID, BillInventory item)
        {
            if (item.Printed > 0)
                return;
            var list = ProductGroupModifierBI.GetProductGroupModifiers(productGroupID);
            using (var frm = new ModifierForm(list, item.Modifiers))
            {
                frm.ShowDialog();
                item.Modifiers = frm.Selection;
            }
            ShowAmount();
        }

        public void ShowDiscount()
        {
            if (!Session.IsAllowed(RoleConstants.DISCOUNT))
                return;

            var list = new ProductGroupBI().GetProductGroups();
            using (var frm = new DiscountForm(list))
            {
                if (frm.ShowDialog() == DialogResult.OK)
                {
                    IList<int> outList;
                    decimal discount = frm.Selection(out outList);
                    discount = discount / 100;
                    foreach (var item in bill)
                    {
                        var pg = new ProductGroupBI().GetProductGroupOfProduct(item.Value.ProductID);
                        if (outList.Contains(pg.ProductGroupID))
                            new BillHelperFunctions(saleForm.BindingSource, bill, item.Value.ProductID).SetDiscount(item.Value.Name, discount);

                    }
                }
            }
            ShowAmount();
        }

        public void ShowCustomerList(bool reset)
        {
            if ((customer.CustomerID == 1) && (!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;
                        saleForm.SetCustomerDisplay(customer.Name);
                    }
                    else
                    {
                        customer = new CustomerBI().GetCustomer(1);
                    }
                }
            }
            else
            {
                customer = new CustomerBI().GetCustomer(1);
                saleForm.SetCustomerDisplay(customer.Name);
            }
        }

        #region Save
        //    if (btnWaiter.Tag == null)
        //btnWaiter.Tag = WaiterBI.GetWaiters()[0].WaiterID;

        public void Save(bool print, int waiterID, string tableID)
        {
            if (print && !Session.IsAllowed(RoleConstants.PRINT_BILL))
                return;
            if (!print && !Session.IsAllowed(RoleConstants.PRINT_KOT))
                return;
            if ((billInfo != null) && (SaleVoucherBI.IsBillPrinted(billInfo.VoucherID)) && (!Session.IsAllowed(RoleConstants.EDIT_PRINTED_BILL)))
                return;
            if (bill.Count == 0)
                return;

            int? saved;
            if (billInfo == null)
                saved = InsertVoucher(print, waiterID, tableID);
            else
                saved = UpdateSale(print, waiterID, tableID);
            if (saved.HasValue)
            {
                if (editVoucherID.HasValue)
                    saleForm.CloseWindow();
                else
                    PrintBill(print, saved.Value);
            }
            ClearBill();
        }
        private int? InsertVoucher(bool finalBill, int waiterID, string tableID)
        {
            if (billInfo != null)
            {
                MessageBox.Show("Error in InsertVoucher, there is a previous sale in memory", "Error");
                return null;
            }


            #region SaleVoucher
            SaleVoucher saleVoucher = new SaleVoucher
            {
                Customer = customer,
                Settled = SettleOptionBI.GetSettleOption(SettleOptionFactory.Unsettled),
                //Paid = finalBill,
                TableID = tableID,
                Waiter = WaiterBI.GetWaiter(waiterID),
                Printed = finalBill,
                Void = false,
                Date = DateTime.Now,
                Narration = "",
                Ref = "",
                Type = 'S',
                User = Session.User
            };
            #endregion
            #region Inventories
            IList<Inventory> iList = GetInventoryForBill(bill.Values);
            #endregion
            SaleVoucherBI.Insert(saleVoucher, iList);
            return saleVoucher.VoucherID;

        }
        private int? UpdateSale(bool finalBill, int waiterID, string tableID)
        {
            #region SaleVoucher
            billInfo.User = Session.User;
            billInfo.Customer = customer;
            if (!billInfo.Printed && finalBill)
                billInfo.Date = null;
            billInfo.Printed = billInfo.Printed || finalBill;
            billInfo.TableID = tableID;
            billInfo.Waiter = WaiterBI.GetWaiter(waiterID);
            //if ((!billInfo.Printed) && finalBill)
            //    billInfo.Date = null;
            billInfo.Inventories = new List<Inventory>();
            #endregion
            #region Inventory
            IList<Inventory> iList = GetInventoryForBill(bill.Values);
            #endregion
            SaleVoucherBI.Update(billInfo, iList);
            return billInfo.VoucherID;
        }
        private IList<Inventory> GetInventoryForBill(ICollection<BillInventory> list)
        {
            Dictionary<int, Inventory> localList = new Dictionary<int, Inventory>();
            HashSet<int> keys = new HashSet<int>();

            foreach (BillInventory item in list)
            {
                Inventory temp = new Inventory();
                if (localList.ContainsKey(item.ProductID))
                {
                    if (temp.Quantity <= 0)
                        keys.Remove(item.ProductID);

                    temp = localList[item.ProductID];
                    temp.Quantity += item.Quantity;
                    temp.Amount += item.Value;
                    foreach (var mod in item.Modifiers)
                        temp.InventoryModifier.Add(new InventoryModifier() { Modifier = mod });
                    if (temp.Quantity <= 0)
                        keys.Add(item.ProductID);
                }
                else
                {
                    temp.Product = ProductBI.GetProduct(item.ProductID);
                    temp.Quantity = item.Quantity;
                    temp.Rate = item.Price;
                    temp.Discount = item.Discount;
                    temp.ServiceCharge = item.ServiceCharge;
                    temp.Tax = item.Tax;
                    temp.Amount = item.Value;
                    foreach (var mod in item.Modifiers)
                        temp.InventoryModifier.Add(new InventoryModifier() { Modifier = mod });
                    localList.Add(item.ProductID, temp);

                    if (item.Quantity <= 0)
                        keys.Add(item.ProductID);
                }
            }
            foreach (var item in keys)
            {
                localList.Remove(item);
            }
            return localList.Values.ToList();
        }
        #endregion
        public void VoidBill()
        {
            if (billInfo == null)
                return;
            if (!billInfo.Printed)
                return;
            if (Session.IsAllowed(RoleConstants.VOID_BILL))
            {
                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)
                    {
                        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);
                    }
                }
            }
        }
        Customer selectCustomer_customerEvent(object sender, CustomerEventArgs e)
        {
            using (CustomersForm form = new CustomersForm(e.CustomerID, e.Phone))
            {
                form.ShowDialog();
                return form.Customer;
            }
        }
        private void PrintBill(bool finalBill, int voucherID)
        {
            if (!finalBill)
                Accounts.Print.Thermal.PrintKot(voucherID, bill.Values.ToList());
            else
                Accounts.Print.Thermal.PrintBill(voucherID, bill.Values.ToList());
        }

        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();
        }
        public BillInventory CurrentProduct
        {
            get
            {
                if (saleForm.BindingSource.Position == -1)
                    return null;
                else
                    return bill.ElementAt(saleForm.BindingSource.Position).Value;
            }
        }
        private void ShowAmount()
        {
            //saleForm.BindingSource.CurrencyManager.Position = 1;

            decimal taxAmount = bill.Values.Sum(b => b.TaxAmount);
            decimal discountAmount = bill.Values.Sum(b => b.DiscountAmount);
            decimal grossAmount = bill.Values.Sum(b => b.GrossAmount);
            decimal valueAmount = bill.Values.Sum(b => b.Value);
            decimal serviceChargeAmount = bill.Values.Sum(b => b.ServiceChargeAmount);
            //bill.Values.ToList();
            saleForm.ShowAmount(discountAmount, grossAmount, serviceChargeAmount, taxAmount, valueAmount, bill.Values.ToList());
        }
        public void ProductRemove()
        {
            var item = CurrentProduct;
            if (!Allowed(item))
                return;
            if (item.Printed > 0)
            {
                if (!Session.IsAllowed(RoleConstants.EDIT_PRINTED_PRODUCT))
                    return;
                else if (MessageBox.Show(string.Format("Already {0} items have been printed.\n\rAre you sure you want to delete this item?", item.Printed), "Delete", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.No)
                    return;
            }
            bill.Remove(new BillItemKey(item.ProductID, item.Printed == 0));
            bill.ReCompact();
            ShowAmount();
        }

        public void SetQuantity(decimal quantity, bool prompt)
        {
            var item = CurrentProduct;
            if (!Allowed(item))
                return;
            new BillHelperFunctions(saleForm.BindingSource, bill, CurrentProduct.ProductID).SetQuantity(item, quantity, prompt);
            ShowAmount();
        }

        public void ChangeRate()
        {
            new BillHelperFunctions(saleForm.BindingSource, bill, CurrentProduct.ProductID).SetPrice(CurrentProduct);
            ShowAmount();

        }
        private bool Allowed(BillInventory item, RoleConstants role)
        {
            if (item == null)
                return false;
            if (!Session.IsAllowed(role))
                return false;
            return true;
        }
        private bool Allowed(BillInventory item)
        { return item != null; }
        private void InputBox_Validating(object sender, InputBoxValidatingArgs e)
        {
        }
        private void LoadBill(int voucherID)
        {
            ClearBill();
            IList<Inventory> iList = new List<Inventory>();
            SaleVoucherBI.GetSaleVoucher(voucherID, out billInfo, out iList);

            this.customer = billInfo.Customer;
            saleForm.ShowInfo(billInfo.BillID, billInfo.KotID, billInfo.CreationDate, billInfo.Date.Value, billInfo.LastEditDate, customer.Name, billInfo.TableID, billInfo.Waiter.WaiterID, billInfo.Waiter.Name);

            foreach (Inventory inventory in iList)
            {
                BillItemKey key = new BillItemKey(inventory.Product.ProductID, false);
                var product = ProductBI.GetProduct(inventory.Product.ProductID);
                var item = new BillInventory
                {
                    ProductID = product.ProductID,
                    Discount = inventory.Discount,
                    Name = product.Units == string.Empty ? product.Name : product.Name + " (" + product.Units + ")",
                    Price = inventory.Rate,
                    Printed = inventory.Quantity,
                    Quantity = inventory.Quantity,
                    Tax = inventory.Tax,
                    ServiceCharge = inventory.ServiceCharge,
                };
                foreach (var mod in inventory.InventoryModifier)
                    item.Modifiers.Add(mod.Modifier);
                bill.Add(key, item);
            }
            ShowAmount();

        }
        public void LoadBillFromTable(string tableName)
        {
            if (!string.IsNullOrEmpty(tableName))
            {
                SaleVoucher voucher = SaleVoucherBI.GetPendingVoucherID(tableName);
                if (voucher != null)
                {
                    LoadBill(voucher.VoucherID);
                }

            }
            else
            {
                InputBoxResult result = InputBox.Show("Table Number", "0", InputBox_Validating);
                if (result.OK)
                {
                    string tableID = result.Text.Trim();
                    if ((tableID != "C") && (tableID != "") && (!tableID.Contains(".")))
                    {
                        SaleVoucher voucher = SaleVoucherBI.GetPendingVoucherID(tableName);
                        if (voucher != null)
                        {
                            LoadBill(voucher.VoucherID);
                        }
                    }
                    else
                        ClearBill();
                }
            }
        }

        public void CancelBillChanges()
        {
            if (bill.Count != 0 && bill.Values.Any(i => i.Printed != i.Quantity))
                if (MessageBox.Show("Abandon Changes?", "Abandon Changes", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.No)
                    return;
            ClearBill();
        }
        public void ClearBill()
        {
            billInfo = null;
            ShowCustomerList(true);
            bill.Clear();
            saleForm.ClearBill(bill);
        }
        public void FormLoad()
        {
            if (editVoucherID.HasValue)
            {
                LoadBill(editVoucherID.Value);
            }
        }
        internal void SettleBill()
        {
            if (billInfo == null)
                return;
            if (!billInfo.Printed)
                return;
            if (!Session.IsAllowed(RoleConstants.SETTLE_BILL))
                return;
            int option = SettleOptionFactory.Unsettled;
            using (BillSettleForm frm = new BillSettleForm())
            {
                frm.ShowDialog();
                option = frm.optionChosen;
            }
            if (option != SettleOptionFactory.Unsettled)
            {
                SaleVoucherBI.SettleVoucher(Session.User, billInfo.VoucherID, option);
                ClearBill();
            }
        }
    }
}
// How to load a bill
//LoadBill(((PendingBills)bsPending.Current).editVoucherID);
//               ChangeFormState(SaleFormState.Billing);