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

namespace Tanshu.Accounts.PointOfSale
{
    public partial class ModifierForm : Form
    {
        private IList<InventoryModifier> selection;
        private IList<Modifier> modifiersList;
        private IList<CheckBox> list;
        public ModifierForm(IList<Modifier> source, IList<InventoryModifier> selection)
        {
            InitializeComponent();
            this.selection = selection;
            this.modifiersList = source;
            list = new List<CheckBox>();
        }

        private void button_Click(object sender, EventArgs e)
        {
            CheckBox button = sender as CheckBox;
            if (button == null)
                return;
            if (button.CheckState == CheckState.Checked)
                selection.Add(new InventoryModifier() { Modifier = (Modifier)button.Tag });
            else
                selection.Remove(selection.First(x => x.Modifier.ModifierID == ((Modifier)button.Tag).ModifierID));
        }
        private static Point GetSize(FlowLayoutPanel panel, int count)
        {
            Point min = new Point(20, 50);
            Point max = new Point(75, 75);

            var marginWidth = panel.Margin.Right + panel.Margin.Left;
            var marginHeight = panel.Margin.Top + panel.Margin.Bottom;

            var rows = panel.ClientSize.Height / (max.Y + marginHeight);
            var cols = panel.ClientSize.Width / (max.X + marginWidth);

            var num = rows * cols;

            if (num >= count)
                return max;

            var w = max.X;
            var h = max.Y;
            while (w > min.X && h > min.Y)
            {
                h = (panel.ClientSize.Height / (rows + 1)) - marginHeight;
                if (h >= min.Y)
                {
                    ++rows;
                }
                if (rows * cols >= count)
                    break;
                w = (panel.ClientSize.Width / (cols + 1)) - marginWidth;
                if (w >= min.X)
                {
                    ++cols;
                }
                if (rows * cols >= count)
                    break;
            }
            max.X = (panel.ClientSize.Width / cols) - marginWidth;
            max.Y = (panel.ClientSize.Height / rows) - marginHeight;

            return max;
        }
        private void ModifierForm_Load(object sender, EventArgs e)
        {
            var size = GetSize(flpModifier, modifiersList.Count);
            ButtonClickDelegate bcDelegate = new ButtonClickDelegate(button_Click);
            for (int i = 0; i < modifiersList.Count; i++)
            {
                var control = new CheckBox()
                {
                    Name = i.ToString(),
                    Text = modifiersList[i].Name,
                    Width = size.X,
                    Height = size.Y,
                    Tag = modifiersList[i],
                    Appearance = Appearance.Button,
                    Checked = selection.Count(x => x.Modifier.ModifierID == modifiersList[i].ModifierID) > 0
                };
                control.Click += new EventHandler(bcDelegate);
                flpModifier.Controls.Add(control);
                list.Add(control);
            }
        }

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

        private void flpModifier_Resize(object sender, EventArgs e)
        {
            var size = GetSize(flpModifier, modifiersList.Count);
            foreach (var item in list)
            {
                item.Width = size.X;
                item.Height = size.Y;
            }
        }
    }
}