using System.Windows.Media;

namespace System.Windows.Forms
{
    public class CheckBox : ToggleButtonBase
    {
        private static System.Windows.Controls.ControlTemplate toggleButtonTemplate = (System.Windows.Controls.ControlTemplate)System.Windows.Markup.XamlReader.Parse(
            "<ControlTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' TargetType =\"CheckBox\">" +
              "<ToggleButton IsChecked=\"{Binding IsChecked, RelativeSource={RelativeSource TemplatedParent}}\" >" +
                "<Image Name=\"image\" Width=\"16\" Height=\"16\" />" +
              "</ToggleButton>" +
            "</ControlTemplate>");
        private static System.Windows.Controls.ControlTemplate checkBoxTemplate = (System.Windows.Controls.ControlTemplate)System.Windows.Markup.XamlReader.Parse(
            "<ControlTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' TargetType =\"CheckBox\">" +
              "<CheckBox IsChecked=\"{Binding IsChecked, RelativeSource={RelativeSource TemplatedParent}}\" >" +
                "<ContentPresenter/>" +
              "</CheckBox>" +
            "</ControlTemplate>");

        private System.Windows.Controls.TextBlock textBlock;
        protected new System.Windows.Controls.CheckBox control { get; }

        private Appearance appearance;
        public Appearance Appearance 
        {
            get => appearance;
            set
            {
                if (value != appearance)
                {
                    appearance = value;
                    control.Template = value == Appearance.Button ? toggleButtonTemplate : checkBoxTemplate;
                    control.ApplyTemplate();
                }
            }
        }

        protected override void UpdateControlImage(ImageSource image)
        {
            if (Appearance == Appearance.Button)
            {
                var img = control.Template.FindName("image", control) as System.Windows.Controls.Image;
                img.Source = image;
                img.Visibility = image != null ? Visibility.Visible : Visibility.Collapsed;
            }
        }

        protected override void OnEnabledChanged(EventArgs e)
        {
            base.OnEnabledChanged(e);
            textBlock.Opacity = Enabled ? 1 : 0.5;
        }

        public CheckBox()
        {
            control = new();
            SetControl(control);
            textBlock = new();
            textBlock.TextWrapping = TextWrapping.Wrap;
            control.Content = textBlock;
        }
    }
}