using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using Tanshu.Accounts.Entities;
using Tanshu.Common.Helpers;
using Tanshu.Common.KeyboardControl;

namespace Tanshu.Accounts.PointOfSale
{
    public partial class SettleChoicesForm : Form
    {
        private readonly IDictionary<Button, int> _list;
        private decimal _amount;

        public SettleChoicesForm(decimal amount)
        {
            InitializeComponent();
            _amount = amount;
            OptionsChosen = new Dictionary<SettleOption, decimal>();
            _list = new Dictionary<Button, int>();
        }

        private void ButtonClick(object sender, EventArgs e)
        {
            var button = sender as Button;
            if (button == null || button.Tag == null)
                return;
            if (button.Tag is SettleOption)
            {
                var settleOption = (SettleOption)button.Tag;
                using (var frm = new SettleAmountsForm(new NumpadControl(), settleOption, _amount))
                {
                    frm.ShowDialog();
                    UpdateChoice(settleOption, frm.AmountSettled, _list[button]);
                }
            }
            else
            {
                if ((string)button.Tag == "Cancel")
                    _optionsChosen.Clear();
                this.Close();
            }
        }

        private void UpdateChoice(SettleOption settleOption, decimal amount, int group)
        {
            var oldAmount = _optionsChosen.ContainsKey(settleOption) ? _optionsChosen[settleOption] : 0;
            if (amount == 0 && _optionsChosen.ContainsKey(settleOption))
                _optionsChosen.Remove(settleOption);
            else if (_optionsChosen.ContainsKey(settleOption))
                _optionsChosen[settleOption] = amount;
            else if (amount != 0)
                _optionsChosen.Add(settleOption, amount);
            _amount += oldAmount - amount;
            txtAmount.Text = string.Format("Pending Amount: Rs. {0}", _amount);

            if (_optionsChosen.Count == 0)
                foreach (var item in _list.Where(item => item.Value != 0))
                    item.Key.Enabled = true;
            else
                foreach (var item in _list.Where(item => item.Value != group && item.Value != 0))
                    item.Key.Enabled = false;

        }

        private IDictionary<SettleOption, decimal> _optionsChosen;
        public IDictionary<SettleOption, decimal> OptionsChosen
        {
            get
            {
                return _amount == 0 ? _optionsChosen : new Dictionary<SettleOption, decimal>();
            }
            private set { _optionsChosen = value; }
        }

        private void SettleChoicesFormLoad(object sender, EventArgs e)
        {
            txtAmount.Text = string.Format("Pending Amount: Rs. {0}", _amount);
            var count = 0;
            foreach (SettleOption item in Enum.GetValues(typeof(SettleOption)))
            {
                var attribute = item.Attribute();
                if (!attribute.ShowInChoices)
                    continue;
                var button = new Button
                                 {
                                     Name = item.ToString(),
                                     Text = attribute.Name,
                                     Size = new System.Drawing.Size(75, 75),
                                     TabIndex = count,
                                     UseVisualStyleBackColor = true,
                                     Tag = item
                                 };
                button.Click += new EventHandler(ButtonClick);
                flpSettlement.Controls.Add(button);
                _list.Add(button, attribute.Group);
                count++;
            }
            var controlButton = new Button
            {
                Name = "btnOK",
                Text = "OK",
                Size = new System.Drawing.Size(75, 75),
                TabIndex = count,
                UseVisualStyleBackColor = true,
                Tag = "OK"
            };
            controlButton.Click += new EventHandler(ButtonClick);
            flpSettlement.Controls.Add(controlButton);
            _list.Add(controlButton, 0);
            count++;
            controlButton = new Button
            {
                Name = "btnCancel",
                Text = "Cancel",
                Size = new System.Drawing.Size(75, 75),
                TabIndex = count,
                UseVisualStyleBackColor = true,
                Tag = "Cancel"
            };
            controlButton.Click += new EventHandler(ButtonClick);
            flpSettlement.Controls.Add(controlButton);
            _list.Add(controlButton, 0);
            count++;
            txtAmount.TabIndex = count;

            this.Size = this.SizeFromClientSize(new Size(_list.Count * (75 + 6), 3 + txtAmount.Height + 6 + 75 + 3));
            txtAmount.Width = flpSettlement.Width - 6;
        }

    }
}