using System.Collections;
using System.ComponentModel;

namespace System.Windows.Forms
{
    public class ToolTip : IDisposable
    {
        private Hashtable strings;
        private Timer timer;
        private Control activeControl;

        protected System.Windows.Controls.ToolTip tooltip { get; }

        public bool Active { get; set; } // chart

        public int AutoPopDelay { get; set; } // chart

        public int InitialDelay { get; set; } // chart

        public int ReshowDelay { get; set; } // chart

        public bool ShowAlways { get; set; } // chart

        private void Control_MouseLeave(object sender, EventArgs e)
        {
            Hide(sender as Control);
        }

        public string GetToolTip(Control control) => (string)strings[control] ?? "";

        public void SetToolTip(Control control, string text)
        {
            if (!strings.ContainsKey(control))
            {
                control.MouseEnter += control_MouseEnter;
                control.MouseLeave += control_MouseLeave;
                control.MouseMove += control_MouseMove;
                control.MouseDown += control_MouseDown;
            }

            strings[control] = text;

            if (control.control.IsMouseOver)
            {
                activeControl = control;
                ShowTooltip(control);
            }
        }

        private void control_MouseEnter(object sender, EventArgs e)
        {
            timer.Start();
            activeControl = (Control)sender;
        }

        private void control_MouseLeave(object sender, EventArgs e)
        {
            timer.Stop();
            HideTooltip();
            activeControl = null;
        }

        private void control_MouseMove(object sender, MouseEventArgs e)
        {
            if (!tooltip.IsOpen)
            {
                timer.Stop();
                timer.Start();
            }
        }

        private void control_MouseDown(object sender, MouseEventArgs e)
        {
            timer.Stop();
            HideTooltip();
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            timer.Stop();
            ShowTooltip(activeControl);
        }

        private void ShowTooltip(Control control)
        {
            var pos = System.Windows.Input.Mouse.GetPosition(control.control);
            // position under cursor
            Show(GetToolTip(control), control,
                control.control.FlowDirection == FlowDirection.RightToLeft ? (int)((control.control.ActualWidth - pos.X) * control.DpiScale) : (int)(pos.X * control.DpiScale), 
                (int)((pos.Y + 18) * control.DpiScale));
        }

        private void HideTooltip()
        {
            tooltip.IsOpen = false;
        }

        public void Show(string text, Control control, int x, int y)
        {
            x = (int)(x / control.DpiScale);
            y = (int)(y / control.DpiScale);
            tooltip.Placement = Windows.Controls.Primitives.PlacementMode.Relative;
            tooltip.PlacementTarget = control.control;
            tooltip.HorizontalOffset = control.control.FlowDirection == FlowDirection.RightToLeft ? control.Width / control.DpiScale - x : x;
            tooltip.VerticalOffset = y;
            tooltip.Content = text;
            tooltip.FlowDirection = control.control.FlowDirection;
            tooltip.IsOpen = true;
        }

        public void Hide(Control control) 
        { 
            HideTooltip();
        }

        public void Dispose() 
        { 
            timer.Dispose();
        }

        public ToolTip()
        {
            tooltip = new();
            strings = new();
            timer = new();
            timer.Interval = SystemInformation.MouseHoverTime;
            timer.Tick += timer_Tick;
        }

        public ToolTip(IContainer container) : this() { }
    }
}