// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using System.Drawing;
using ClassicalSharp;

namespace Launcher.Drawing {
	public unsafe static class Drawer2DExt {
		
		public static void Clear(FastBitmap bmp, Rectangle rect, FastColour col) {
			int x, y, width, height;
			if (!ClampCoords(bmp, rect, out x, out y, out width, out height))
				return;
			int pixel = col.ToArgb();
			
			for (int yy = 0; yy < height; yy++) {
				int* row = bmp.GetRowPtr(y + yy);
				for (int xx = 0; xx < width; xx++)
					row[x + xx] = pixel;
			}
		}
				
		public static bool ClampCoords(FastBitmap bmp, Rectangle rect, out int x,
		                               out int y, out int width, out int height) {
			width = rect.Width; height = rect.Height;
			x = rect.X; y = rect.Y;
			if (x >= bmp.Width || y >= bmp.Height) return false;
			
			if (x < 0) { width += x; x = 0; }
			if (y < 0) { height += y; y = 0; }
			
			width = Math.Min(x + width, bmp.Width) - x;
			height = Math.Min(y + height, bmp.Height) - y;
			return width > 0 && height > 0;
		}		
		
		
		public static void DrawClippedText(ref DrawTextArgs args, IDrawer2D drawer,
		                                   int x, int y, int maxWidth) {
			Size size = drawer.MeasureSize(ref args);
			// No clipping necessary
			if (size.Width <= maxWidth) { drawer.DrawText(ref args, x, y); return; }
			DrawTextArgs copy = args;
			copy.SkipPartsCheck = true;
			
			char[] chars = new char[args.Text.Length + 2];
			for (int i = 0; i < args.Text.Length; i++)
				chars[i] = args.Text[i];
			chars[args.Text.Length] = '.';
			chars[args.Text.Length + 1] = '.';
			
			for (int len = args.Text.Length; len > 0; len--) {
				chars[len] = '.';
				if (chars[len - 1] == ' ') continue;
				
				copy.Text = new string(chars, 0, len + 2);
				size = drawer.MeasureSize(ref copy);
				if (size.Width > maxWidth) continue;
				
				drawer.DrawText(ref copy, x, y); return;
			}
		}
	}
}