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

namespace ClassicalSharp.Gui.Widgets {
	public sealed class SurvivalHudWidget : Widget {
		
		public SurvivalHudWidget(Game game) : base(game) {
			HorizontalAnchor = Anchor.Centre;
			VerticalAnchor = Anchor.BottomOrRight;
		}
		
		// TODO: scaling
		public override void Init() {
			//float scale = 2 * game.GuiHotbarScale;
			Width = (int)(9 * 10);// * scale);
			Height = (int)9;// * scale);
			
			X = game.Width / 2 - Width / 2;
			Y = game.Height - Height - 100;
		}
		
		public override void Render(double delta) {
			Model.ModelCache cache = game.ModelCache;
			int index = 0, health = game.LocalPlayer.Health;			
			for (int heart = 0; heart < 10; heart++) {
				Texture tex = new Texture(0, X + 16 * heart, Y - 18, 18, 18, backRec);
				IGraphicsApi.Make2DQuad(ref tex, FastColour.WhitePacked,
				                        cache.vertices, ref index);
				
				if (health >= 2) {
					tex = new Texture(0, X + 16 * heart + 2, Y - 18 + 2, 14, 14, fullRec);
				} else if (health == 1) {
					tex = new Texture(0, X + 16 * heart + 2, Y - 18 + 2, 14, 14, halfRec);
				} else {
					continue;
				}
				
				IGraphicsApi.Make2DQuad(ref tex, FastColour.WhitePacked,
				                        cache.vertices, ref index);
				health -= 2;
			}
			
			game.Graphics.Texturing = true;
			game.Graphics.BindTexture(game.Gui.IconsTex);
			game.Graphics.UpdateDynamicIndexedVb(DrawMode.Triangles, cache.vb, cache.vertices, index);
			game.Graphics.Texturing = false;
		}
		
		static TextureRec backRec = new TextureRec(16 / 256f, 0 / 256f, 9 / 256f, 9 / 256f);
		static TextureRec fullRec = new TextureRec(53 / 256f, 1 / 256f, 7 / 256f, 7 / 256f);
		static TextureRec halfRec = new TextureRec(62 / 256f, 1 / 256f, 7 / 256f, 7 / 256f);
		
		public override void Dispose() { }
	}
}