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 Voucher 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)
                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().GetProductGroupTypes();
            using (var frm = new DiscountForm(list))
            {
                if (frm.ShowDialog() == DialogResult.OK)
                {
                    HashSet<string> outList;
                    decimal discount = frm.Selection(out outList);
                    discount = discount / 100;
                    foreach (var item in bill)
                    {
                        if (item.Key.KotID == -1)
                            continue;
                        var pg = new ProductGroupBI().GetProductGroupOfProduct(item.Value.ProductID);
                        if (outList.Contains(pg.GroupType))
                            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) && (VoucherBI.IsBillPrinted(billInfo.VoucherID)) && (!Session.IsAllowed(RoleConstants.EDIT_PRINTED_BILL)))
                return;
            if (bill.Count == 1) //new kot only
                return;
            if (print)
                ShowDiscount();
            int? saved;
            if (billInfo == null)
                saved = InsertVoucher(print, waiterID, tableID);
            else
                saved = UpdateSale(print, waiterID, tableID);
            if (editVoucherID.HasValue)
                saleForm.CloseWindow();
            else
            {
                int kotID = 0;
                if (!print && saved.HasValue)
                    kotID = saved.Value;
                if (print || kotID != 0)
                    PrintBill(billInfo.VoucherID, kotID);
            }
            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 Voucher
            billInfo = new Voucher
            {
                Customer = customer,
                Settled = SettleOption.Unsettled,
                //Paid = finalBill,
                TableID = tableID,
                Waiter = WaiterBI.GetWaiter(waiterID),
                Printed = finalBill,
                Void = false,
                Date = DateTime.Now,
                Narration = "",
                User = Session.User
            };
            #endregion
            #region Inventories
            var kot = GetKotForBill();
            if (kot != null)
                billInfo.Kots.Add(kot);
            #endregion
            return VoucherBI.Insert(billInfo);
        }
        private int? UpdateSale(bool finalBill, int waiterID, string tableID)
        {
            #region Voucher
            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);
            var kot = GetKotForBill();
            if (kot != null)
                billInfo.Kots.Add(kot);
            #endregion
            #region Inventory
            #endregion
            return VoucherBI.Update(billInfo);
        }
        private Kot GetKotForBill()
        {
            var kot = new Kot();
            foreach (var item in bill)
            {
                if (item.Key.KotID == -1 || item.Value.Quantity == 0)
                    continue;
                else if (item.Key.KotID != 0)
                {
                    var oldKot = billInfo.Kots.Where(x => x.KotID == item.Key.KotID).Single();
                    var inv = oldKot.Inventories.Where(x => x.Product.ProductID == item.Key.ProductID).Single();
                    inv.Rate = item.Value.Price;
                    inv.Discount = item.Value.Discount;
                }
                else
                {
                    Inventory temp = new Inventory();
                    temp.Product = ProductBI.GetProduct(item.Key.ProductID);
                    temp.Quantity = item.Value.Quantity;
                    temp.Rate = item.Value.Price;
                    temp.Discount = item.Value.Discount;
                    temp.ServiceCharge = item.Value.ServiceCharge;
                    temp.Tax = item.Value.Tax;
                    foreach (var mod in item.Value.Modifiers)
                        temp.InventoryModifier.Add(new InventoryModifier() { Modifier = mod });
                    kot.Inventories.Add(temp);
                }
            }
            if (kot.Inventories.Count == 0)
                return null;
            else
                return kot;
        }
        #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)
                    {
                        VoucherBI.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(int voucherID, int kotID)
        {
            if (kotID == 0)
                Accounts.Print.Thermal.PrintBill(voucherID);
            else
                Accounts.Print.Thermal.PrintKot(voucherID, kotID);
        }

        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
                {
                    var item = bill.ElementAt(saleForm.BindingSource.Position);
                    if (item.Key.KotID == -1)
                        return null;
                    else
                        return item.Value;
                }
            }
        }
        public BillInventory CurrentKot
        {
            get
            {
                if (saleForm.BindingSource.Position == -1)
                    return null;
                else
                {
                    var item = bill.ElementAt(saleForm.BindingSource.Position);
                    if (item.Key.KotID != -1)
                        return null;
                    else if (item.Key.ProductID == 0)
                        return null;
                    else
                        return item.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)
                return;
            bill.Remove(new BillItemKey(item.ProductID, 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()
        {
            var item = CurrentProduct;
            if (!Allowed(item))
                return;
            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();
            bill.Clear();
            billInfo = null;
            billInfo = VoucherBI.GetSaleVoucher(voucherID);

            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 (var kot in billInfo.Kots)
            {
                BillItemKey kotKey = new BillItemKey(kot.KotID, -1);
                var kotItem = new BillInventory
                {
                    ProductID = kot.KotID,
                    Discount = 0,
                    Name = string.Format("Kot No.: {0} / KotID {1}", kot.KotID, kot.Code),
                    Price = 0,
                    Printed = true,
                    Quantity = 0,
                    Tax = -1,
                    ServiceCharge = 0,
                };
                bill.Add(kotKey, kotItem);
                foreach (var inv in kot.Inventories)
                {
                    BillItemKey key = new BillItemKey(inv.Product.ProductID, kot.KotID);
                    var item = new BillInventory
                    {
                        ProductID = inv.Product.ProductID,
                        Discount = inv.Discount,
                        Name = inv.Product.Units == string.Empty ? inv.Product.Name : inv.Product.Name + " (" + inv.Product.Units + ")",
                        Price = inv.Rate,
                        Printed = true,
                        Quantity = inv.Quantity,
                        Tax = inv.Tax,
                        ServiceCharge = inv.ServiceCharge,
                    };
                    foreach (var mod in inv.InventoryModifier)
                        item.Modifiers.Add(mod.Modifier);
                    bill.Add(key, item);
                }
            }
            BillItemKey newKotKey = new BillItemKey(0, -1);
            var newKotItem = new BillInventory
            {
                ProductID = 0,
                Discount = 0,
                Name = "== New Kot ==",
                Price = 0,
                Printed = true,
                Quantity = 0,
                Tax = -1,
                ServiceCharge = 0,
            };
            bill.Add(newKotKey, newKotItem);
            ShowAmount();

        }
        public void LoadBillFromTable(string tableName)
        {
            if (!string.IsNullOrEmpty(tableName))
            {
                var table = new FoodTableBI().GetByName(tableName);
                if (table != null && table.VoucherID != 0)
                {
                    LoadBill(table.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(".")))
                    {
                        var table = new FoodTableBI().GetByName(tableName);
                        if (table != null && table.VoucherID != 0)
                        {
                            LoadBill(table.VoucherID);
                        }
                    }
                    else
                        ClearBill();
                }
            }
        }

        public void CancelBillChanges()
        {
            if (bill.Count != 0 && bill.Values.Any(i => i.Printed == false))
                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();
            BillItemKey newKotKey = new BillItemKey(0, -1);
            var newKotItem = new BillInventory
            {
                ProductID = 0,
                Discount = 0,
                Name = "== New Kot ==",
                Price = 0,
                Printed = true,
                Quantity = 0,
                Tax = -1,
                ServiceCharge = 0,
            };
            bill.Add(newKotKey, newKotItem);
            saleForm.ClearBill(bill);
        }
        public void FormLoad()
        {
            ClearBill();
            if (editVoucherID.HasValue)
            {
                LoadBill(editVoucherID.Value);
            }
        }
        internal void SettleBill()
        {
            if (billInfo == null)
                return;
            if (!billInfo.Printed)
                return;
            if (!Session.IsAllowed(RoleConstants.SETTLE_BILL))
                return;
            var option = SettleOption.Unsettled;
            using (BillSettleForm frm = new BillSettleForm())
            {
                frm.ShowDialog();
                option = frm.optionChosen;
            }
            if (option != SettleOption.Unsettled)
            {
                VoucherBI.SettleVoucher(Session.User, billInfo.VoucherID, option);
                ClearBill();
            }
        }

        internal void MoveTable()
        {
            if (billInfo == null)
                return;
            if (VoucherBI.IsBillPrinted(billInfo.VoucherID) && !Session.IsAllowed(RoleConstants.EDIT_PRINTED_BILL))
                return;
            var table = GetTableForMove(true);
            if (table == null)
                return;
            if (table.VoucherID == 0)
                LoadBill(MoveTable(table));
            else
                LoadBill(MergeTable(table));
        }
        private int MoveTable(FoodTable table)
        {
            if (!Session.IsAllowed(RoleConstants.MOVE_TABLE))
                return 0;
            return new FoodTableBI().Move(billInfo.TableID, table);
        }
        private int MergeTable(FoodTable table)
        {
            if (!Session.IsAllowed(RoleConstants.MERGE_TABLE))
                return 0;
            var kots = bill.Where(x => x.Key.KotID == -1 && x.Key.ProductID != 0);
            foreach (var item in kots)
                MergeKot(item.Value, table);
            VoucherBI.Delete(billInfo.VoucherID);
            return table.VoucherID;
        }

        private int MergeKot(BillInventory kot, FoodTable table)
        {
            if (!Session.IsAllowed(RoleConstants.MERGE_KOT))
                return 0;
            return VoucherBI.MoveKot(kot.ProductID, table);
        }
        private int MoveKot(BillInventory kot, FoodTable table)
        {
            if (!Session.IsAllowed(RoleConstants.MOVE_KOT))
                return 0;
            CreateNewVoucherForKotMove(kot, table);
            return MergeKot(kot, table);
        }
        private void CreateNewVoucherForKotMove(BillInventory kot, FoodTable table)
        {
            var voucher = new Voucher
            {
                Customer = billInfo.Customer,
                Settled = SettleOption.Unsettled,
                TableID = table.Name,
                Waiter = billInfo.Waiter,
                Printed = false,
                Void = false,
                Date = DateTime.Now,
                Narration = "",
                User = Session.User
            };
            VoucherBI.Insert(voucher);
        }
        private FoodTable GetTableForMove(bool allowMerge)
        {
            using (var frm = new frmMoveTable(new FoodTableBI().List(), allowMerge))
            {
                frm.ShowDialog();
                if (frm.Selection != null)
                    return frm.Selection;
            }
            return null;
        }

        internal void MergeKot()
        {
            if (billInfo == null)
                return;
            if (VoucherBI.IsBillPrinted(billInfo.VoucherID) && !Session.IsAllowed(RoleConstants.EDIT_PRINTED_BILL))
                return;
            var kot = CurrentKot;
            if (kot == null)
                return;
            var table = GetTableForMove(true);
            if (table == null)
                return;
            var count = bill.Keys.Count(x => x.KotID == -1 && x.ProductID != 0);
            int voucherID = 0;
            if (table.VoucherID == 0 && count > 1)
                //Move Kot
                voucherID = MoveKot(kot, table);
            else if (table.VoucherID == 0 && count == 1)
                //Move Table
                voucherID = MoveTable(table);
            else if (table.VoucherID != 0 && count > 1)
                //Merge Kot
                voucherID = MergeKot(kot, table);
            else if (table.VoucherID != 0 && count == 1)
                //Merge Table
                voucherID = MergeTable(table);
            if (voucherID != 0)
                LoadBill(voucherID);
        }
    }
}