using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Text;

namespace BsWidget
{
    internal static class GdiPlusExt
    {
        public static void ClearRect(this Graphics g, Color color, float x, float y, float w, float h)
        {
            g.SetClip(new RectangleF(x, y, w, h));
            g.Clear(color);
            g.ResetClip();
        }

        public static void SetHighQuality(this Graphics g)
        {
            g.CompositingMode = CompositingMode.SourceOver;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.PixelOffsetMode = PixelOffsetMode.HighQuality;
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
        }

        public static SizeF DrawStringWithOutline(this Graphics g, string text, Font font, float x, float y, Color outlineColor, Color fillColor, float outlineWidth = 1)
        {
            // assuming g is the Graphics object on which you want to draw the text
            using var p = new GraphicsPath();
            p.AddString(
                text,             // text to draw
                font.FontFamily,  // or any other font family
                (int)FontStyle.Regular,      // font style (bold, italic, etc.)
                g.DpiY * font.Size / 72,       // em size
                new PointF(x, y),              // location where to draw text
                new StringFormat());          // set options here (e.g. center alignment)
            using var outlinePen = new Pen(outlineColor, outlineWidth);
            using var fillBrush = new SolidBrush(fillColor);
            g.FillPath(fillBrush, p);
            g.DrawPath(outlinePen, p);
            return p.GetBounds().Size;
        }

        public static void DrawRoundedRectangle(this Graphics graphics, Pen pen, RectangleF bounds, int cornerRadius)
        {
            if (graphics == null)
                throw new ArgumentNullException("graphics");
            if (pen == null)
                throw new ArgumentNullException("pen");

            using var path = RoundedRect(bounds, cornerRadius);
            graphics.DrawPath(pen, path);
        }

        public static void FillRoundedRectangle(this Graphics graphics, Brush brush, RectangleF bounds, float cornerRadius)
        {
            if (graphics == null)
                throw new ArgumentNullException("graphics");
            if (brush == null)
                throw new ArgumentNullException("brush");

            using var path = RoundedRect(bounds, cornerRadius);
            graphics.FillPath(brush, path);
        }

        public static SizeF DrawStringWithRoundedRect(this Graphics g, string text, Font font, float x, float y, Brush textbBrushe, Brush bgBrush, float radus = 10)
        {
            var sz = g.MeasureString(text, font);
            g.FillRoundedRectangle(bgBrush, new RectangleF(x, y, sz.Width, sz.Height), radus);
            g.DrawString(text, font, textbBrushe, x, y);
            return sz;
        }

        private static GraphicsPath RoundedRect(RectangleF bounds, float radius)
        {
            var diameter = radius * 2;
            var size = new SizeF(diameter, diameter);
            var arc = new RectangleF(bounds.Location, size);
            var path = new GraphicsPath();

            if (Math.Abs(radius) < 0.00001)
            {
                path.AddRectangle(bounds);
                return path;
            }

            // top left arc
            path.AddArc(arc, 180, 90);

            // top right arc
            arc.X = bounds.Right - diameter;
            path.AddArc(arc, 270, 90);

            // bottom right arc
            arc.Y = bounds.Bottom - diameter;
            path.AddArc(arc, 0, 90);

            // bottom left arc
            arc.X = bounds.Left;
            path.AddArc(arc, 90, 90);

            path.CloseFigure();
            return path;
        }
    }
}