using System;
using System.Windows.Forms;
using Tanshu.Accounts.Repository;
using Tanshu.Accounts.Entities;

namespace Tanshu.Accounts.PointOfSale
{
    public partial class ProductForm : Form
    {
        private Guid? _productID;
        public ProductForm(Guid? productID)
        {
            _productID = productID;
            InitializeComponent();
        }

        private void Products_Load(object sender, EventArgs e)
        {
            FillCombos();
            if (_productID.HasValue)
            {
                Product product;
                using (var bi = new ProductBI())
                    product = bi.Get(x => x.ProductID == _productID.Value);
                txtName.Text = product.Name;
                txtUnits.Text = product.Units;
                txtPrice.Text = product.Price.ToString("#.##");
                txtFullPrice.Text = product.FullPrice.ToString("#.##");
                cmbVat.SelectedValue = product.Vat.TaxID;
                cmbServiceTax.SelectedValue = product.ServiceTax.TaxID;
                txtServiceCharge.Text = product.ServiceCharge.ToString("#.##");
                chkIsActive.Checked = product.IsActive;
                chkIsScTaxable.Checked = product.IsScTaxable;
                chkIsNotAvailable.Checked = product.IsNotAvailable;
                cmbProductGroup.SelectedValue = product.ProductGroup.ProductGroupID;
            }
            else
            {
                txtName.Focus();
            }
        }

        private void FillCombos()
        {
            using (var bi = new ProductGroupBI())
                bsProductGroups.DataSource = bi.List();
            using (var bi = new TaxBI())
            {
                bsServiceTax.DataSource = bi.List();
                bsVat.DataSource = bi.List();
            }
        }

        private void btnAddCategory_Click(object sender, EventArgs e)
        {
            using (var frm = new ProductGroupListForm())
                frm.ShowDialog();
            FillCombos();
            cmbProductGroup.SelectedIndex = -1;
        }

        private Product IsFormValid()
        {
            var product = new Product();

            if (_productID.HasValue)
                product.ProductID = _productID.Value;

            if (string.IsNullOrEmpty(txtName.Text.Trim()))
                return null;
            product.Name = txtName.Text.Trim();
            product.Units = txtUnits.Text.Trim();

            decimal price;
            if (string.IsNullOrEmpty(txtPrice.Text.Trim()))
            {
                price = 0;
            }
            else
            {
                if (!decimal.TryParse(txtPrice.Text.Trim(), out price))
                    return null;
            }
            if (price < 0)
                return null;
            product.Price = price;

            if (string.IsNullOrEmpty(txtFullPrice.Text.Trim()))
            {
                price = 0;
            }
            else
            {
                if (!decimal.TryParse(txtFullPrice.Text.Trim(), out price))
                    return null;
            }
            if (price < 0 || price < product.Price)
                return null;
            product.FullPrice = price;

            // Tax
            if (cmbVat.SelectedItem == null)
                return null;
            product.Vat = (Tax)cmbVat.SelectedItem;

            if (cmbServiceTax.SelectedItem == null)
                return null;
            product.ServiceTax = (Tax)cmbServiceTax.SelectedItem;

            decimal serviceCharge;
            if (string.IsNullOrEmpty(txtServiceCharge.Text.Trim()))
            {
                serviceCharge = 0;
            }
            else
            {
                if (!decimal.TryParse(txtServiceCharge.Text.Trim(), out serviceCharge))
                    return null;
            }

            if (serviceCharge < 0 || serviceCharge > 1)
                return null;
            product.ServiceCharge = serviceCharge;

            product.IsScTaxable = chkIsScTaxable.Checked;
            product.IsActive = chkIsActive.Checked;
            product.IsNotAvailable = chkIsNotAvailable.Checked;

            //Group
            if (cmbProductGroup.SelectedItem == null)
                return null;
            product.ProductGroup = (ProductGroup)cmbProductGroup.SelectedItem;
            return product;
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            var product = IsFormValid();
            if (product != null)
            {
                using (var bi = new ProductBI())
                {
                    if (_productID.HasValue)
                        bi.Update(product);
                    else
                        bi.Insert(product);
                    bi.SaveChanges();
                }
                MessageBox.Show("Update / Save Successful");
                this.Close();
            }
            else
                MessageBox.Show("The form is not valid");
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}