using System;
using System.Windows.Forms;
using Tanshu.Accounts.Repository;
using Tanshu.Accounts.Entities;
using System.Linq;
using System.Collections.Generic;

namespace Tanshu.Accounts.PointOfSale
{
    public partial class ModifierEditForm : Form
    {
        private Guid? _modifierID;
        public ModifierEditForm(Guid modifierID)
            : this()
        {
            _modifierID = modifierID;
        }

        public ModifierEditForm()
        {
            InitializeComponent();
        }

        private void ModifierEditForm_Load(object sender, EventArgs e)
        {
            Modifier modifier;
            var groups = ProductGroupBI.List();
            clbGroups.DataSource = groups;
            if (_modifierID.HasValue)
            {

                modifier = ModifierBI.Get(_modifierID.Value);

                txtName.Text = modifier.Name;
                chkShowInBill.Checked = modifier.ShowInBill;
                txtPrice.Text = modifier.Price.ToString();
                if (modifier.ProductGroupModifiers.Any(x => x.ProductGroup == null))
                {
                    chkShowForAll.Checked = true;
                    clbGroups.Hide();
                }
                else
                {
                    chkShowForAll.Checked = false;
                    for (int i = 0; i < clbGroups.Items.Count; i++)
                    {
                        var item = (ProductGroup)clbGroups.Items[i];
                        clbGroups.SetItemChecked(i, modifier.ProductGroupModifiers.Any(x => x.ProductGroup.ProductGroupID == item.ProductGroupID));
                    }
                }
            }
            else
            {
                txtName.Focus();
            }
        }

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

        private void btnOk_Click(object sender, EventArgs e)
        {
            decimal price;
            if (string.IsNullOrEmpty(txtName.Text.Trim()))
            {
                MessageBox.Show("Name cannot be blank.");
                txtName.Focus();
            }
            else if (!decimal.TryParse(txtPrice.Text, out price) || price < 0)
            {
                MessageBox.Show("Price has to be a number >= 0.");
                txtName.Focus();
            }
            else
            {
                Save();
                MessageBox.Show("Update / Save Successful");
                this.Close();
            }
        }
        private void Save()
        {
            Modifier modifier;
            if (_modifierID.HasValue)
                modifier = ModifierBI.Get(_modifierID.Value);
            else
                modifier = new Modifier();

            modifier.Name = txtName.Text.Trim();
            modifier.Price = decimal.Parse(txtPrice.Text);
            modifier.ShowInBill = chkShowInBill.Checked;
            modifier.ProductGroupModifiers = GetProductGroups(modifier);
            if (_modifierID.HasValue)
                ModifierBI.Update(modifier);
            else
                ModifierBI.Insert(modifier);

        }
        private List<ProductGroupModifier> GetProductGroups(Modifier modifier)
        {
            var list = new List<ProductGroupModifier>();
            if (chkShowForAll.Checked)
            {
                list.Add(new ProductGroupModifier() { ShowAutomatically = false });
            }
            else
            {
                foreach (var item in clbGroups.CheckedItems.OfType<ProductGroup>())
                {
                    list.Add(new ProductGroupModifier() { ProductGroup = item });
                }
                clbGroups.CheckedItems.OfType<ProductGroup>();
            }
            return list;
        }
        private void clbGroups_Format(object sender, ListControlConvertEventArgs e)
        {
            e.Value = ((ProductGroup)e.ListItem).Name;
        }

        private void chkShowForAll_CheckedChanged(object sender, EventArgs e)
        {
            if (chkShowForAll.Checked)
                clbGroups.Hide();
            else
                clbGroups.Show();
        }
    }
}