using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Tanshu.Common;
using Tanshu.Accounts.Contracts;
using System.Windows.Forms;
using System.Threading;
using Tanshu.Accounts.Repository;
using Tanshu.Accounts.Entities;

namespace Tanshu.Accounts.PointOfSale
{
    public static class BillHelperFunctions
    {
        #region Discount
        public static void SetDiscount(int productID, decimal discount, Customer customer, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            #region InputBox
            if (discount == -1)
            {
                InputBoxResult result = InputBox.Show("Discount", "0", InputBox_Validating);
                if (result.OK)
                {
                    if (!decimal.TryParse(result.Text, out discount))
                        return;
                    discount /= 100;
                }
            }
            if (discount == -1)
                return;
            #endregion

            #region Max Discount
            decimal maxDiscount = SaleVoucherBI.GetProductDiscountLimit(productID);
            if ((discount > maxDiscount) && customer.CustomerID != 1)
            {
                MessageBox.Show(string.Format("Maximum discount for this product is {0:P}", maxDiscount), "Excessive Discount", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else if ((discount > maxDiscount) && customer.CustomerID == 1)
            {
                MessageBox.Show(string.Format("Maximum discount for this product is {0:P} Discount Disallowed", maxDiscount), "Excessive Discount", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            #endregion

            if (bill.ContainsKey(new BillItemKey(productID, true)))
                SetDiscount(bill[new BillItemKey(productID, true)], discount);
            if (bill.ContainsKey(new BillItemKey(productID, false)))
                SetDiscount(bill[new BillItemKey(productID, false)], discount);
            return;
        }
        private static void SetDiscount(BillInventory product, decimal discount)
        {
            product.Discount = discount;
        }
        #endregion
        #region Add Product
        public static BillInventory AddProductToGrid(int productID, BindingSource bindingSource, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            BillInventory product;
            if ((!bill.ContainsKey(new BillItemKey(productID, false))) && (!bill.ContainsKey(new BillItemKey(productID, true))))
            {
                //No new or old
                product = AddNewProduct(productID, bindingSource, bill);
            }
            else if (bill.ContainsKey(new BillItemKey(productID, true)))
            {
                //Has new or both
                BillItemKey key = new BillItemKey(productID, true);
                bindingSource.CurrencyManager.Position = ProductPosition(key, bill);
                product = bill[key];
                SetQuantity(product, 1, false);
            }
            else
            {
                //Has only old
                product = bill[new BillItemKey(productID, false)];
                if (product.Additional <= -1)
                    SetQuantity(product, 1, false);
                else if (product.Additional < 0)
                {
                    decimal quantity = 1 + product.Additional;
                    SetQuantity(product, 1, false);

                    decimal rate = bill[new BillItemKey(productID, false)].Discount;
                    decimal discount = bill[new BillItemKey(productID, false)].Price;
                    product = AddNewProduct(productID, bindingSource, bill);
                    SetDiscount(product, discount);
                    SetRate(productID, rate, bill);

                    SetQuantity(product, quantity, true);

                }
                else
                {
                    decimal discount = bill[new BillItemKey(productID, false)].Discount;
                    decimal rate = bill[new BillItemKey(productID, false)].Price;
                    product = AddNewProduct(productID, bindingSource, bill);
                    SetDiscount(product, discount);
                    SetRate(productID, rate, bill);
                }
            }
            return product;
        }
        private static BillInventory AddNewProduct(int productID, BindingSource bindingSource, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            BillItemKey key = new BillItemKey(productID, true);
            BillInventory product = SaleVoucherBI.GetDefaultSaleBillItem(productID);
            product.Quantity = 1;
            bill.Add(key, product);
            bindingSource.DataSource = bill.Values;
            bindingSource.CurrencyManager.Position = bindingSource.CurrencyManager.Count + 1;
            return product;

        }
        private static int ProductPosition(BillItemKey key, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            for (int i = 0; i < bill.Count; i++)
            {
                if (bill.Keys.ElementAt(i) == key)
                    return i;
            }
            return 0;
        }

        #endregion
        #region Quantity
        public static void SetQuantity(BillInventory product, decimal quantity, bool absolute, bool prompt, BindingSource bindingSource, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            #region Prompt
            if (prompt)
            {
                InputBoxResult result = InputBox.Show("Quantity", (product.Quantity + 1).ToString(), InputBox_Validating);
                if (result.OK)
                {
                    if (!decimal.TryParse(result.Text, out quantity))
                        return;
                    absolute = true;
                }
            }
            if (quantity == 0)
                return;
            #endregion

            CheckQuantity(product, quantity, absolute);

            if (product.Printed == 0)
            {
                SetQuantity(product, quantity, absolute);
            }
            else if (bill.ContainsKey(new BillItemKey(product.ProductID, true)))
            {
                BillInventory otherProduct = bill[new BillItemKey(product.ProductID, true)];
                if (absolute)
                    SetQuantity(otherProduct, quantity - product.Printed, absolute);
                else
                    SetQuantity(otherProduct, quantity, absolute);
            }
            else
            {
                if (product.Additional < 0)
                {
                    if (!absolute)
                        quantity += product.Additional;
                    product.Quantity = product.Printed;
                }
                if (absolute)
                    quantity -= product.Quantity;
                if (quantity > 0)
                {
                    BillInventory otherProduct = AddProductToGrid(product.ProductID, bindingSource, bill);
                    SetQuantity(otherProduct, quantity, true);
                }
                else if ((quantity < 0) && (Thread.CurrentPrincipal.IsInRole("Sales/EditPrintedProduct")))
                {
                    SetQuantity(product, quantity, false);
                }
            }

        }
        private static bool CheckQuantity(BillInventory product, decimal quantity, bool absolute)
        {
            if (!absolute)
                quantity = product.Quantity + quantity;
            if (quantity < 0)
                return false;
            else if ((quantity < product.Printed) && (!Thread.CurrentPrincipal.IsInRole("Sales/EditPrintedProduct")))
                return false;
            else
                return true;
        }
        private static void SetQuantity(BillInventory product, decimal quantity, bool absolute)
        {
            if (!absolute)
            {
                quantity = product.Quantity + quantity;
            }
            if (quantity <= 0)
                return;
            product.Quantity = quantity;
        }
        #endregion
        #region Amount
        public static void SetAmount(BillInventory product, decimal amount, BindingSource bindingSource, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            if (amount == -1)
            {
                InputBoxResult result = InputBox.Show("Amount", (product.Value).ToString(), InputBox_Validating);
                if (result.OK)
                {
                    amount = Convert.ToDecimal(result.Text);
                }
            }
            if (amount == -1)
                return;
            else
            {
                SetQuantity(product, amount / (product.Price * (1 + product.Tax) * (1 - product.Discount)), true, false, bindingSource, bill);
            }
        }
        #endregion
        #region Rate
        public static void SetRate(int productID, decimal rate, OrderedDictionary<BillItemKey, BillInventory> bill)
        {
            if (bill.ContainsKey(new BillItemKey(productID, true)))
                bill[new BillItemKey(productID, true)].Price = rate;
            if (bill.ContainsKey(new BillItemKey(productID, false)))
                bill[new BillItemKey(productID, false)].Price = rate;
        }
        #endregion
        private static void InputBox_Validating(object sender, InputBoxValidatingArgs e)
        {
        }

    }
}