using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ShortcutUtil
{
    public interface IListBoxControl
    {
        void Hover();
        void Unhover();
    }

    public class ListBoxButton : Button, IListBoxControl
    {
        public void Hover()
        {
            OnMouseDown(new MouseEventArgs(MouseButtons.Left, 0, 1, 1, 0));
        }
        public void Unhover()
        {
            OnMouseUp(new MouseEventArgs(MouseButtons.Left, 0, 1, 1, 0));
        }
    }

    public class ListBoxControl<T> where T : Control, IListBoxControl, new()
    {
        public T Control { get; private set; }
        private ListBox listBox;

        public int? IndexOver { get; private set; }

        private MethodInfo refreshItem;
        public ListBoxControl(T control, ListBox listBox)
        {
            Control = control;
            this.listBox = listBox;
            listBox.MouseMove += ListBoxMouseMove;

            refreshItem = listBox.GetType().GetMethod("RefreshItem", BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[] { typeof(int) }, null);
        }

        private void RefreshItem(int index)
        {
            listBox.BeginUpdate();
            object item = listBox.Items[index];
            listBox.Items.RemoveAt(index);
            listBox.Items.Insert(index, item);
            listBox.EndUpdate();
            //listBox.Items[index] = item;
            //listBox.Items[index] = 
            //if (refreshItem != null) refreshItem.Invoke(listBox, new object[] { index });
        }

        public Rectangle BoundsInList(int index)
        {
            Point offsetLoc = listBox.GetItemRectangle(index).Location;
            offsetLoc.Offset(Control.Location);
            return new Rectangle(offsetLoc, Control.Size);
        }

        private void ListBoxMouseMove(object sender, MouseEventArgs e)
        {
            int? nowIndexOver = null;
            for (int i = 0; i < listBox.Items.Count; i++)
            {
                if (BoundsInList(i).Contains(e.X, e.Y))
                {
                    nowIndexOver = i;
                    break;
                }
            }

            if (nowIndexOver != IndexOver)
            {
                if (IndexOver.HasValue) RefreshItem(IndexOver.Value);
                IndexOver = nowIndexOver;
                if (IndexOver.HasValue) RefreshItem(IndexOver.Value);
            }
        }

        public void RenderToItem(DrawItemEventArgs e)
        {
            using (Bitmap b = new Bitmap(Control.Size.Width, Control.Size.Height))
            {
                if (e.Index == IndexOver)
                {
                    Control.Hover();
                }
                Control.DrawToBitmap(b, new Rectangle(new Point(), Control.Size));
                Point offsetLoc = e.Bounds.Location;
                offsetLoc.Offset(Control.Location);
                e.Graphics.DrawImage(b, offsetLoc.X, offsetLoc.Y);
                if (e.Index == IndexOver)
                {
                    Control.Unhover();
                }
            }
        }

    }
}