using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Windows.Forms;
using Tanshu.Accounts.Helpers;
using Tanshu.Accounts.Contracts;
using Tanshu.Accounts.Repository;
using Tanshu.Accounts.Entities;
using Tanshu.Accounts.Entities.Auth;

namespace Tanshu.Accounts.PointOfSale
{
    public partial class ProductForm : Form
    {
        private int? _productID;
        public ProductForm(int? 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);
                txtProductID.Text = _productID.Value.ToString();
                txtCode.Text = product.Code.ToString();
                txtName.Text = product.Name;
                txtUnits.Text = product.Units;
                txtSalePrice.Text = product.SalePrice.ToString("#.##");
                cmbTax.SelectedValue = product.Tax.TaxID;
                txtServiceCharge.Text = product.ServiceCharge.ToString("#.##");
                chkDiscontinued.Checked = product.Discontinued;
                cmbProductGroup.SelectedValue = product.ProductGroup.ProductGroupID;
            }
            else
            {
                txtProductID.Text = "(Auto)";
                txtName.Focus();
            }
        }

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

            int code;
            if (!int.TryParse(txtCode.Text, out code))
                return null;
            if (code < 0)
                return null;
            product.Code = code;

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

            decimal salePrice;
            if (!decimal.TryParse(txtSalePrice.Text, out salePrice))
                return null;
            if (salePrice < 0)
                return null;
            product.SalePrice = salePrice;

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

            decimal serviceCharge;
            if (!decimal.TryParse(txtServiceCharge.Text, out serviceCharge))
                return null;
            if (serviceCharge < 0 || serviceCharge > 1)
                return null;
            product.ServiceCharge = serviceCharge;

            product.Discontinued = chkDiscontinued.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);
                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();
        }
    }
}