using Android.Content;
using Android.Graphics;
using Pixiview.Droid.Renderers;
using Pixiview.UI;
using Xamarin.Forms;

[assembly: ExportRenderer(typeof(RoundImage), typeof(RoundImageRenderer))]
namespace Pixiview.Droid.Renderers
{
    public class RoundImageRenderer : Xamarin.Forms.Platform.Android.FastRenderers.ImageRenderer
    {
        public RoundImageRenderer(Context context) : base(context)
        {
        }

        public override void SetBackgroundColor(Android.Graphics.Color color)
        {
            // nothing
        }

        protected override void OnDraw(Canvas canvas)
        {
            if (Element is RoundImage image)
            {
                var radius = image.CornerRadius;
                var mask = image.CornerMasks;
                if (radius > 0 && mask != CornerMask.None)
                {
                    var r = Resources.DisplayMetrics.Density * radius;

                    var radii = new float[8];
                    if ((mask & CornerMask.LeftTop) == CornerMask.LeftTop)
                    {
                        radii[0] = radii[1] = r;
                    }
                    if ((mask & CornerMask.RightTop) == CornerMask.RightTop)
                    {
                        radii[2] = radii[3] = r;
                    }
                    if ((mask & CornerMask.RightBottom) == CornerMask.RightBottom)
                    {
                        radii[4] = radii[5] = r;
                    }
                    if ((mask & CornerMask.LeftBottom) == CornerMask.LeftBottom)
                    {
                        radii[6] = radii[7] = r;
                    }

                    var path = new Path();
                    int width = Width;
                    int height = Height;
                    path.AddRoundRect(new RectF(0, 0, width, height), radii, Path.Direction.Cw);
                    canvas.ClipPath(path);
                }
            }

            base.OnDraw(canvas);
        }
    }
}