using System;

namespace Assistance {

	[Flags]

	public enum Modifiers {

		None = 0,

		Interpolation = 1,

		Guideline = 2,

		Multiline = 4

	};

	public class Tool {

		public Modifiers getAvailableModifiers()

			{ return Modifiers.None; }

		public void activate() { }

		public void keyPress(Gdk.Key key, InputState state) { }

		public void keyRelease(Gdk.Key key, InputState state) { }

		public void buttonPress(Gdk.Device device, uint button, InputState state) { }

		public void buttonRelease(Gdk.Device device, uint button, InputState state) { }

		public bool paintBegin() { return false; }

		public void paintTrackBegin(Track track) { }

		public void paintTrackPoint(Track track) { }

		public void paintTrackEnd(Track track) { }

		public bool paintApply() { return false; }

		public void paintCancel() { }

		public void draw(Cairo.Context context) { }

		public void deactivate() { }

	}

}

/*

TODO:

		//////////////////////////////////////////

		// deprecated

		//////////////////////////////////////////

		public static readonly Pen pen = new Pen("Dark Green", 3.0);

		public static readonly Pen penSpecial = new Pen("Blue", 3.0);

		public static readonly Pen penPreview = new Pen("Dark Green", 1.0, 0.25);

		public void draw(Cairo.Context context, bool preview = false) {

			if (preview) {

				if (points.Count < 2)

					return;

				context.Save();

				penPreview.apply(context);

				context.MoveTo(points[0].point.x, points[0].point.y);

				for(int i = 1; i < points.Count; ++i)

					context.LineTo(points[i].point.x, points[i].point.y);

				context.Stroke();

				context.Restore();

			} else {

				context.Save();

				pen.apply(context);

				foreach(TrackPoint p in points) {

					double t = p.keyState.howLongPressed(Gdk.Key.m)

					         + p.buttonState.howLongPressed(3);

					double w = p.pressure*pen.width + 5.0*t;

					context.Arc(p.point.x, p.point.y, 2.0*w, 0.0, 2.0*Math.PI);

					context.Fill();

				}

				context.Restore();

			}

		}

		public Rectangle getBounds() {

			if (points.Count == 0)

				return new Rectangle();

			Rectangle bounds = new Rectangle(points[0].point);

			foreach(TrackPoint p in points)

				bounds = bounds.expand(p.point);

			return bounds.inflate(Math.Max(pen.width, penPreview.width) + 2.0);

		}

*/