using System.Drawing;
using System.Windows.Media;

namespace System.Windows.Forms
{
    public class Button : ButtonBase
    {
        protected new CustomControls.Button control { get; }

        public AutoSizeMode AutoSizeMode { get; set; }

        public DialogResult DialogResult { get; set; }

        private bool autoSize;
        public new bool AutoSize 
        { 
            get => autoSize;
            set
            {
                autoSize = value;
                UpdateSize();
            }
        }

        public override Image BackgroundImage
        {
            get => base.BackgroundImage;
            set
            {
                base.BackgroundImage = value;
                control.BackgroundImage = Helper.GetImage(value, DeviceDpi, DeviceDpi);
            }
        }

        private void UpdateSize()
        {
            if (autoSize)
            {
                var width = Width;
                var height = Height;

                ResetAutoSizeValue(true);
                var size = AutoSizeValue;
                // restore control size after reset/autosizevalue calls. Setting Width and Height does not update control size always
                SetControlWidth(width);
                SetControlHeight(height);

                if (AutoSizeMode == AutoSizeMode.GrowOnly)
                {
                    Width = size.Width > width ? size.Width + 4 : width;
                    Height = size.Height > height ? size.Height : height;
                }
                else
                {
                    Width = size.Width + 4; // padding
                    Height = size.Height;
                }
                
                if ((Anchor & AnchorStyles.Right) != 0)
                {
                    Left += width - Width;
                }
            }
        }

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

        protected override void UpdateContentAlignment()
        {
            base.UpdateContentAlignment();
            // SWF consistency
            if (control != null && control.HorizontalContentAlignment == Windows.HorizontalAlignment.Left)
                control.Padding = new Thickness(1, 1, 0, 0);
        }

        protected override void UpdateControlImage(ImageSource image)
        {
            control.Image = image;
            UpdateSize();
        }

        protected override void OnClick(EventArgs e)
        {
            base.OnClick(e);
            var form = FindForm();
            if (form != null && DialogResult != DialogResult.None)
                form.DialogResult = DialogResult;
        }

        protected override void ScaleCore(float dx, float dy)
        {
            base.ScaleCore(dx, dy);
            if (autoSize)
                UpdateSize();
        }

        public Button()
        {
            control = new();
            SetControl(control);
            BackColor = System.Drawing.SystemColors.ControlLightLight;
            Width = 75;
            Height = 23;
        }
    }
}