using System.Drawing;

namespace System.Windows.Forms
{
    public class TabPage : ContainerControl
    {
        protected new System.Windows.Controls.TabItem control { get; }

        public override string Text 
        { 
            get => control.Header?.ToString(); 
            set => control.Header = value; 
        }

        public bool UseVisualStyleBackColor { get; set; }

        // WPF TabItem control is just a "tab" (not a container for its child controls), so its location/size should not be changed.
        protected override void SetControlLeft(int value) { }
        protected override void SetControlTop(int value) { }
        protected override void SetControlWidth(int value) { }
        protected override void SetControlHeight(int value) { }

        // return actual bounding rectangle to make layout engine working (case: FR QueryBuilder in pmV2)
        public override Rectangle DisplayRectangle => 
            container.ActualWidth == 0 ?
            base.DisplayRectangle :
            new Rectangle(0, 0, (int)(container.ActualWidth * DpiScale), (int)(container.ActualHeight * DpiScale));

        private void EnumControls(Control control, Action<Control> action)
        {
            action(control);
            foreach (Control c in control.Controls)
                EnumControls(c, action);
        }

        public TabPage()
        {
            control = new();
            SetContentControl(control);
            control.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
            control.VerticalAlignment = System.Windows.VerticalAlignment.Stretch;
            
            // the actual container for tab's child controls is this.container so we need to watch its size
            control.SizeChanged -= Size_Changed;
            container.SizeChanged += (s, e) =>
            {
                container.Dispatcher.InvokeAsync(() =>
                {
                    // fix issues with pmV2: refresh controls when tab page becomes active and its dpi is changed (case: FR chart editor)
                    EnumControls(this, c => c.Refresh());
                });
                Size_Changed(s, e);
            };
        }
    }
}