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 decimal _totalAmount;
        private readonly VoucherType _voucherType;
        private IDictionary<SettleOption, decimal> _optionsChosen;
        public SettleChoicesForm(decimal totalAmount, VoucherType voucherType)
        {
            InitializeComponent();
            _totalAmount = totalAmount;
            _voucherType = voucherType;
            _optionsChosen = new Dictionary<SettleOption, decimal>();
        }

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

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

        private void ButtonClick(object sender, EventArgs e)
        {
            var settleOption = (SettleOption)((sender as Button).Tag);
            using (var frm = new SettleAmountsForm(new NumpadControl(), settleOption, PendingAmount))
            {
                frm.ShowDialog();
                UpdateChoice(settleOption, frm.AmountSettled);
            }
        }

        private void UpdateChoice(SettleOption settleOption, decimal amount)
        {
            if (amount == 0 && _optionsChosen.ContainsKey(settleOption))
                _optionsChosen.Remove(settleOption);
            else if (amount != 0 && _optionsChosen.ContainsKey(settleOption))
                _optionsChosen[settleOption] = amount;
            else if (amount != 0 && !_optionsChosen.ContainsKey(settleOption))
                _optionsChosen.Add(settleOption, amount);
            else if (_totalAmount == 0 && amount == 0 && !_optionsChosen.ContainsKey(settleOption))
                _optionsChosen.Add(settleOption, amount);
            txtAmount.Text = string.Format("Pending Amount: Rs. {0}", PendingAmount);
        }
        private decimal PendingAmount
        {
            get
            {
                decimal amount = _totalAmount;
                foreach (var item in _optionsChosen)
                {
                    amount -= item.Value;
                }
                return amount;
            }
        }
        public IDictionary<SettleOption, decimal> OptionsChosen
        {
            get
            {
                return PendingAmount == 0 ? _optionsChosen : new Dictionary<SettleOption, decimal>();
            }
        }
        private void OkClick(object sender, EventArgs e)
        {
            this.Close();
        }
        private void CancelClick(object sender, EventArgs e)
        {
            _optionsChosen.Clear();
            this.Close();
        }
    }
}