using UnityEngine;
using System.Collections;

public class Tools{

	static Material lineMaterial;
	static void CreateLineMaterial()
	{
		if( !lineMaterial ) {
			lineMaterial = new Material( "Shader \"Lines/Colored Blended\" {" +
			                            "SubShader { Pass { " +
			                            "    Blend SrcAlpha OneMinusSrcAlpha " +
			                            "    ZWrite Off Cull Off Fog { Mode Off } " +
			                            "    BindChannels {" +
			                            "      Bind \"vertex\", vertex Bind \"color\", color }" +
			                            "} } }" );
			lineMaterial.hideFlags = HideFlags.HideAndDontSave;
			lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
		}
	}


	public static void DrawRectangle(Rect rect, Color color){
		DrawRectangle (rect.x, rect.y, rect.width, rect.height, color);
	}
	public static void DrawRectangle(float x, float y, float width, float height, Color color){
		CreateLineMaterial ();
		lineMaterial.SetPass (0);
		GL.Begin(GL.QUADS);
		GL.Color(color);
		GL.Vertex3(x, y, 0);
		GL.Vertex3(x, y + height, 0);
		GL.Vertex3(x + width, y + height, 0);
		GL.Vertex3(x + width, y, 0);
		GL.End();
	}

	public static Rect BoundsToRect(Bounds bounds){
		return new Rect(bounds.min.x, bounds.min.y, bounds.max.x - bounds.min.x, bounds.max.y - bounds.min.y);
	}

	public static Vector3 WorldToGuiPoint(Vector3 point){

        var pt = Camera.main.WorldToScreenPoint(point);
        pt.y = Camera.main.pixelHeight - pt.y;
		return pt;
	}

	public static void BeginGui(bool verticalFlip = true){
		GL.PushMatrix();
		if (verticalFlip) {
			GL.LoadPixelMatrix (0, Camera.current.pixelWidth, Camera.current.pixelHeight, 0);
		} else {
			GL.LoadPixelMatrix (0, Camera.current.pixelWidth, 0, Camera.current.pixelHeight);
		}

	}

	public static void EndGui(){
		GL.PopMatrix();
	}
}