using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using Tanshu.Accounts.Contracts;
using Tanshu.Accounts.Entities;
using Tanshu.Accounts.Helpers;
using Tanshu.Accounts.PointOfSale.Sales;
using Tanshu.Accounts.Print;
using Tanshu.Accounts.Repository;
using Tanshu.Common;

namespace Tanshu.Accounts.PointOfSale
{
    public class BillController
    {
        private readonly OrderedDictionary<BillItemKey, BillInventory> bill =
            new OrderedDictionary<BillItemKey, BillInventory>();

        private Voucher _billInfo;
        private Customer _customer = new CustomerBI().GetCustomer(1);

        private int? _editVoucherID;

        private ISaleForm _saleForm;

        public BillController(int? editVoucherID)
        {
            this._editVoucherID = editVoucherID;
        }

        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;
                    return item.Value;
                }
            }
        }

        public BillInventory CurrentKot
        {
            get
            {
                if (_saleForm.BindingSource.Position == -1)
                    return null;
                else
                {
                    KeyValuePair<BillItemKey, BillInventory> item = bill.ElementAt(_saleForm.BindingSource.Position);
                    if (item.Key.KotID != -1)
                        return null;
                    if (item.Key.ProductID == 0)
                        return null;
                    return item.Value;
                }
            }
        }

        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();
            var 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;
                    var discount = frm.Selection(out outList);
                    discount = discount / 100;
                    foreach (var item in bill)
                    {
                        if (item.Key.KotID == -1)
                            continue;
                        ProductGroup 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 (var selectCustomer = new SelectCustomer(new CustomerBI().GetFilteredCustomers, true))
                {
                    selectCustomer.customerEvent += 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);
            }
        }

        public void VoidBill()
        {
            if (_billInfo == null)
                return;
            if (!_billInfo.Printed)
                return;
            if (!Session.IsAllowed(RoleConstants.VOID_BILL))
                return;
            if (MessageBox.Show("Are you sure you want to void this bill?", "Void Bill", MessageBoxButtons.YesNo,
                                MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) != DialogResult.Yes)
                return;
            var 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);
            }
        }

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

        private static void PrintBill(int voucherID, int kotID)
        {
            if (kotID == 0)
                Thermal.PrintBill(voucherID);
            else
                Thermal.PrintKot(voucherID, kotID);
        }

        private static List<StringType> GetVoidReason(Dictionary<string, string> filter)
        {
            var list = new List<StringType>
                           {
                               new StringType("Discount"),
                               new StringType("Printing Fault"),
                               new StringType("Item Changed"),
                               new StringType("Quantity Reduced"),
                               new StringType("Costing Bill for Party"),
                               new StringType("Cashier Mistake"),
                               new StringType("Management Freesale"),
                               new StringType("Other")
                           };
            return list.Where(i => i.Description.ToLower().Contains(filter["Name"].ToLower().Trim())).ToList();
        }

        private void ShowAmount()
        {
            //saleForm.BindingSource.CurrencyManager.Position = 1;

            var taxAmount = bill.Values.Sum(b => b.TaxAmount);
            var discountAmount = bill.Values.Sum(b => b.DiscountAmount);
            var grossAmount = bill.Values.Sum(b => b.GrossAmount);
            var valueAmount = bill.Values.Sum(b => b.Value);
            var 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;
            return Session.IsAllowed(role);
        }

        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.Get(voucherID);

            _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)
            {
                var 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)
                {
                    var 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);
                }
            }
            var 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().Get(tableName);
                if (table != null && table.VoucherID != 0)
                {
                    LoadBill(table.VoucherID);
                }
            }
            else
            {
                var result = InputBox.Show("Table Number", "0", InputBox_Validating);
                if (result.OK)
                {
                    var tableID = result.Text.Trim();
                    if ((tableID != "C") && (tableID != "") && (!tableID.Contains(".")))
                    {
                        var table = new FoodTableBI().Get(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();
            var 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;
            IDictionary<SettleOption, decimal> options;
            using (var frm = new SettleChoicesForm(_billInfo))
            {
                frm.ShowDialog();
                options = frm.OptionsChosen;
            }
            if (options.Count == 0)
                return;
            VoucherBI.SettleVoucher(Session.User, _billInfo.VoucherID, options);
            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;
            LoadBill(table.VoucherID == 0 ? MoveTable(table) : 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 static 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,
                                  TableID = table.Name,
                                  Waiter = _billInfo.Waiter,
                                  Printed = false,
                                  Void = false,
                                  Date = DateTime.Now,
                                  Narration = "",
                                  User = Session.User
                              };
            VoucherBI.Insert(voucher);
        }

        private static 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);
            var 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);
        }

        #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,
                               //Paid = finalBill,
                               TableID = tableID,
                               Waiter = WaiterBI.GetWaiter(waiterID),
                               Printed = finalBill,
                               Void = false,
                               Date = DateTime.Now,
                               Narration = "",
                               User = Session.User
                           };

            #endregion

            #region Inventories

            Kot 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);
            Kot 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)
                {
                    Kot oldKot = _billInfo.Kots.Where(x => x.KotID == item.Key.KotID).Single();
                    Inventory inv = oldKot.Inventories.Where(x => x.Product.ProductID == item.Key.ProductID).Single();
                    inv.Rate = item.Value.Price;
                    inv.Discount = item.Value.Discount;
                }
                else
                {
                    var 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 (Modifier 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
    }
}