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

namespace Tanshu.Accounts.PointOfSale.Sales
{
    public partial class SalesForm : Form
    {
        private ProductGroup _currentProductGroup;
        public SalesForm(BillController billController)
        {
            InitializeComponent();
            _controller = billController;
            this.Text = Session.User.Name;
        }

        private void ShowInfo()
        {
            Voucher voucher = _controller._voucher;
            BillDict bill = _controller._bill;
            if (voucher.VoucherID == Guid.Empty)
            {
                txtBillID.Text = "";
                txtKotID.Text = "";
                txtCreationDate.Text = "";
                txtDate.Text = "";
                txtLastEditDate.Text = "";
            }
            else
            {
                txtBillID.Text = voucher.FullBillID;
                txtKotID.Text = "K-" + voucher.KotID.ToString();
                txtCreationDate.Text = voucher.CreationDate.ToString("HH:mm dd-MMM-yyyy");
                txtDate.Text = voucher.Date.ToString("HH:mm dd-MMM-yyyy");
                txtLastEditDate.Text = voucher.LastEditDate.ToString("HH:mm dd-MMM-yyyy");
            }
            btnCustomer.Text = voucher.Customer.Name;
            txtTableID.Text = voucher.Table == null ? "" : voucher.Table.Name;
            txtPax.Text = voucher.Pax.ToString();
            bindingSource.CurrencyManager.Position = Math.Min(bindingSource.CurrencyManager.Position, bill.Count - 1);
            txtGrossTax.Text = string.Format("{0:#0.00}", bill.Tax);
            txtDiscount.Text = string.Format("{0:#0.00}", bill.Discount);
            txtServiceCharge.Text = string.Format("{0:#0.00}", bill.ServiceCharge);
            txtGrossAmount.Text = string.Format("{0:#0.00}", bill.NetAmount);
            txtAmount.Text = string.Format("{0:#0.00}", bill.Amount);
            bindingSource.DataSource = bill.ToList();
            dgvProducts.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.DisplayedCells);
            MoreButton(false);
        }

        public BillItemValue CurrentProduct
        {
            get
            {
                if (bindingSource.Position == -1)
                    return null;
                var item = _controller._bill.ElementAt(bindingSource.Position);
                return item.Key.BillItemType != BillItemType.Kot ? item.Value : null;
            }
        }

        public BillItemKey CurrentKey
        {
            get
            {
                if (bindingSource.Position == -1)
                    return null;
                var item = _controller._bill.ElementAt(bindingSource.Position);
                return item.Key;
            }
        }

        public BillItemKey CurrentKot
        {
            get
            {
                if (bindingSource.Position == -1)
                    return null;
                var item = _controller._bill.ElementAt(bindingSource.Position);
                return item.Key.BillItemType == BillItemType.Kot ? item.Key : null;
            }
        }

        private void SalesForm_KeyDown(object sender, KeyEventArgs e)
        {
            switch (e.KeyCode)
            {
                case Keys.F2:
                    {
                        btnQuantity_Click(sender, new EventArgs());
                        break;
                    }
                case Keys.F3:
                    {
                        btnDiscount_Click(sender, new EventArgs());
                        break;
                    }
                case Keys.F4:
                    {
                        if (!e.Alt)
                        {
                            _controller.ShowCustomers();
                            ShowInfo();
                        }
                        break;
                    }
                case Keys.F8:
                    {
                        _controller.LoadBill(null);
                        ShowInfo();
                        FormState = SaleFormState.Billing;
                        break;
                    }
                case Keys.F11:
                    {
                        btnPrintBill_Click(sender, e);
                        break;
                    }
                case Keys.F12:
                    {
                        btnPrintKot_Click(sender, e);
                        break;
                    }
                case Keys.Delete:
                    {
                        _controller.SetQuantity(CurrentKey, CurrentProduct, -1, false);
                        ShowInfo();
                        break;
                    }
                case Keys.Add:
                    {
                        _controller.SetQuantity(CurrentKey, CurrentProduct, 1, false);
                        ShowInfo();
                        break;
                    }
                case Keys.Subtract:
                    {
                        _controller.SetQuantity(CurrentKey, CurrentProduct, -1, false);
                        ShowInfo();
                        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:
                    {
                        var canceled = _controller.CancelBillChanges();
                        ShowInfo();
                        if (canceled)
                            FormState = SaleFormState.Waiting;
                        break;
                    }
            }
        }

        private void SalesForm_Load(object sender, EventArgs e)
        {
            var showSC = (bool)SettingBI.Get("Service Charge").Details["Enabled"];
            txtServiceCharge.Visible = showSC;
            lblServiceCharge.Visible = showSC;
            var state = _controller.FormLoad();
            ShowInfo();
            FormState = state;
        }

        private void btnCustomer_Click(object sender, EventArgs e)
        {
            _controller.ShowCustomers();
            ShowInfo();
        }

        private void btnVoid_Click(object sender, EventArgs e)
        {
            var voided = _controller.VoidBill();
            ShowInfo();
            if (voided)
                FormState = SaleFormState.Waiting;
        }

        private void btnPrice_Click(object sender, EventArgs e)
        {
            var item = CurrentProduct;
            if (item == null)
                return;
            _controller.SetPrice(CurrentProduct);
            ShowInfo();
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            var canceled = _controller.CancelBillChanges();
            ShowInfo();
            if (canceled)
                FormState = SaleFormState.Waiting;
        }

        private void dgvProducts_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            var dgv = sender as DataGridView;
            var data = (KeyValuePair<BillItemKey, BillItemValue>)dgv.Rows[e.RowIndex].DataBoundItem;

            if (data.Key.BillItemType == BillItemType.Kot)
            {
                e.CellStyle.SelectionBackColor = Color.Blue;
                e.CellStyle.BackColor = Color.LightBlue;
            }
            else if (data.Value.inventory.Kot != null)
            {
                e.CellStyle.SelectionBackColor = Color.HotPink;
                e.CellStyle.BackColor = Color.LightPink;
            }
            else
            {
                e.CellStyle.SelectionBackColor = Color.Green;
                e.CellStyle.BackColor = Color.LightGreen;
            }
            if (dgv.Columns[e.ColumnIndex].Name.Equals("DisplayColumn"))
                e.Value = data.Value.Display;
            else if (dgv.Columns[e.ColumnIndex].Name.Equals("QuantityColumn"))
            {
                if (data.Key.BillItemType != BillItemType.Kot)
                    e.Value = data.Value.inventory.Quantity;
                else
                    e.Value = "";
            }
        }

        private void btnSettle_Click(object sender, EventArgs e)
        {
            var settled = _controller.SettleBill();
            ShowInfo();
            if (settled)
                FormState = SaleFormState.Waiting;
        }

        private void btnModifier_Click(object sender, EventArgs e)
        {
            var item = CurrentProduct;
            if (item == null || CurrentKey.KotID != Guid.Empty)
                return; // No Product or Old Product

            _controller.ShowModifiers(item);
            ShowInfo();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            _controller.SetQuantity(CurrentKey, CurrentProduct, -1, false);
            ShowInfo();
        }

        private void btnMoveTable_Click(object sender, EventArgs e)
        {
            _controller.MoveTable();
            ShowInfo();
        }

        private void btnMore_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            if (button.Text == "More")
                MoreButton(true);
            else if (button.Text == "Less")
                MoreButton(false);
            else
                throw new InvalidOperationException("Button State incorrect");
        }

        private void MoreButton(bool more)
        {
            btnMore.Text = more ? "Less" : "More";
            btnQuantity.Visible = !more;
            btnPrice.Visible = more;
            btnDelete.Visible = !more;
            btnDiscount.Visible = !more;
            btnModifier.Visible = !more;
            btnMoveTable.Visible = more;
            btnMoveKot.Visible = more;
            btnVoid.Visible = more;
            btnSplitBill.Visible = more;
        }

        private void btnMoveKot_Click(object sender, EventArgs e)
        {
            _controller.MoveKot(CurrentKot);
            ShowInfo();
        }

        #region Helper Functions

        private SaleFormState FormState
        {
            set
            {
                flpGroup.Controls.Clear();
                flpMain.Controls.Clear();
                if (value == SaleFormState.Billing)
                    ControlFactory.GenerateGroups(ref flpGroup, new Point(75, 75), 0, Cache.ProductGroups(), productTypeButton_Click, productTypePage_Click);
                else
                    ControlFactory.GenerateTables(ref flpMain, new Point(75, 75), 0, FoodTableBI.List(true), tableButton_Click, tablePage_Click);

            }
        }
        private void productTypeButton_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var item = button.Tag as ProductGroup;
            if (item == null)
                return;
            _currentProductGroup = item;
            ControlFactory.GenerateProducts(ref flpMain, new Point(75, 75), 0,
                                            item.Products, productButton_Click, productPage_Click);
        }

        private void productTypePage_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var start = (int)button.Tag;
            if (start < 0)
                start = 0;
            ControlFactory.GenerateGroups(ref flpGroup, new Point(75, 75), start, Cache.ProductGroups(), productTypeButton_Click, productTypePage_Click);
        }

        private void productButton_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var item = button.Tag as Product;
            if (item.IsNotAvailable)
                return;
            _controller.AddProduct(item);
            bindingSource.DataSource = _controller._bill.ToList();
            bindingSource.CurrencyManager.Position = _controller._bill.IndexOfKey(new BillItemKey(item.ProductID, Guid.Empty, item.HasHappyHour));
            // TODO: Refactor this so that this is loaded in the cache with the products
            if (CurrentProduct.inventory.Product.ProductGroup.IsModifierCompulsory)
                _controller.ShowModifiers(CurrentProduct);
            ShowInfo();
        }

        private void productPage_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var item = button.Tag as Product;
            var start = (int)button.Tag;
            if (start < 0)
                start = 0;
            ControlFactory.GenerateProducts(ref flpMain, new Point(75, 75), start, _currentProductGroup.Products, productButton_Click, productPage_Click);
        }

        private void tableButton_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var item = button.Tag as FoodTable;
            var tableName = item.Name;
            _controller.LoadBill(tableName);
            ShowInfo();
            FormState = SaleFormState.Billing;
        }

        private void tablePage_Click(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null)
                return;
            var start = (int)button.Tag;
            if (start < 0)
                start = 0;
            ControlFactory.GenerateTables(ref flpMain, new Point(75, 75), start, FoodTableBI.List(true), tableButton_Click, tablePage_Click);
        }
        private void btnPrintBill_Click(object sender, EventArgs e)
        {
            btnPrintBill.Enabled = false;
            bool isPrinted = false, isVoid = false;
            if (_controller._voucher.VoucherID != Guid.Empty)
            {
                var dbVoucher = VoucherBI.Get(_controller._voucher.VoucherID);
                isPrinted = dbVoucher.Printed;
                isVoid = dbVoucher.Void;
            }

            if (_controller.CanSaveBill(isPrinted, isVoid))
            {
                var amount = _controller._bill.NetAmount;
                _controller.SetDiscount();
                ShowInfo();
                var printed = _controller.SaveAndPrintBill(isPrinted, amount);
                if (printed)
                {
                    if (_controller._editVoucherID.HasValue)
                        this.Close();
                    else
                    {
                        ShowInfo();
                        FormState = SaleFormState.Waiting;
                    }
                }
            }
            btnPrintBill.Enabled = true;

        }

        private void btnPrintKot_Click(object sender, EventArgs e)
        {
            btnPrintKot.Enabled = false;
            var printed = _controller.SaveAndPrintKot();
            if (printed)
            {
                if (_controller._editVoucherID.HasValue)
                    this.Close();
                else
                {
                    ShowInfo();
                    FormState = SaleFormState.Waiting;
                }
            }
            btnPrintKot.Enabled = true;
        }

        private void btnQuantity_Click(object sender, EventArgs e)
        {
            _controller.SetQuantity(CurrentKey, CurrentProduct, 0, true);
            ShowInfo();
        }

        private void btnDiscount_Click(object sender, EventArgs e)
        {
            _controller.SetDiscount();
            ShowInfo();
        }

        #endregion

        private void btnSplitBill_Click(object sender, EventArgs e)
        {
            _controller.SplitBill();
            ShowInfo();
        }
    }
}