using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using Tanshu.Accounts.Helpers;

namespace Tanshu.Accounts.PointOfSale
{
    public partial class DiscountForm : Form
    {
        private readonly IList<string> _source;
        private readonly HashSet<string> _selection;
        decimal _discount;
        public DiscountForm(IList<string> source)
        {
            InitializeComponent();
            this._source = source;
            _selection = new HashSet<string>();
        }

        private void button_Click(object sender, EventArgs e)
        {
            var button = sender as CheckBox;
            if (button == null)
                return;
            var item = (string)button.Tag;
            if (button.CheckState == CheckState.Checked)
                _selection.Add(item);
            else
                _selection.Remove(item);
        }
        public decimal Selection(out HashSet<string> list)
        {
            list = _selection;
            return _discount;
        }

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

        private void DiscountForm_Load(object sender, EventArgs e)
        {
            ControlFactory.GenerateGroups(ref flpModifier, new Point(75, 75), _source, new ButtonClickDelegate(button_Click));
        }

        private void txtAmount_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Return && decimal.TryParse(txtAmount.Text, out _discount) && _discount >= 0 && _discount <= 100)
            {
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            else if (e.KeyCode == Keys.Escape)
            {
                this.DialogResult = DialogResult.Cancel;
                this.Close();
            }
        }

    }
}