/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2014, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * This file is part of PlantUML.
 *
 * Licensed under The MIT License (Massachusetts Institute of Technology License)
 * 
 * See http://opensource.org/licenses/MIT
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
 * IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 *
 * Original Author:  Arnaud Roques
 */
package net.sourceforge.plantuml.cute;

import java.awt.geom.Point2D;

import net.sourceforge.plantuml.ugraphic.UTranslate;

public class TriangleCorner {

	private final Point2D o;
	private final Point2D a;
	private final Point2D b;
	private final TriangleCornerSimple simple;
	private final UTranslate translateO;
	private final UTranslate translateOreverse;

	private final RotationZoom rotation;
	private final RotationZoom rotationInverse;

	@Override
	public String toString() {
		return "Corner " + o + " a=" + a + " b=" + b;
	}

	public boolean hasCurvation() {
		return ((MyPoint2D) o).hasCurvation();
	}

	public double getCurvation() {
		if (hasCurvation() == false) {
			throw new IllegalStateException();
		}
		return ((MyPoint2D) o).getCurvation(0);
	}

	public TriangleCorner(Point2D o, Point2D a, Point2D b) {
		this.o = o;
		this.a = a;
		this.b = b;
		this.translateO = new UTranslate(o);
		this.translateOreverse = translateO.reverse();
		final Point2D a2 = translateOreverse.getTranslated(a);
		final Point2D b2 = translateOreverse.getTranslated((b));

		final Point2D a3, b3;
		if (a2.getX() == 0) {
			a3 = a2;
			b3 = b2;
			this.rotation = RotationZoom.none();
			this.rotationInverse = RotationZoom.none();
		} else {
			this.rotation = RotationZoom.builtRotationOnYaxis(a2);
			this.rotationInverse = rotation.inverse();
			a3 = rotation.getPoint(a2);
			b3 = rotation.getPoint(b2);
		}

		this.simple = new TriangleCornerSimple(a3, b3);
	}

	public Point2D getOnSegmentA(double dist) {
		final Segment seg = new Segment(o, a);
		return seg.getFromAtoB(dist);
	}

	public Point2D getOnSegmentB(double dist) {
		final Segment seg = new Segment(o, b);
		return seg.getFromAtoB(dist);
	}

	public Balloon getCenterWithFixedRadius(double radius) {
		final Point2D centerSimple = simple.getCenterWithFixedRadius(radius);
		return new Balloon(rotationInverse.getPoint(translateO.getTranslated(centerSimple)), radius);
	}

	private Balloon getBalloonWithFixedY(double y) {
		Balloon result = simple.getBalloonWithFixedY(y);
		result = result.rotate(rotationInverse);
		result = result.translate(translateO);
		return result;
	}

	public Point2D getCornerOrBalloonCenter() {
		if (hasCurvation()) {
			return getBalloonInside().getCenter();
		}
		return getO();
	}

	public double determinant() {
		final double ux = a.getX() - o.getX();
		final double uy = a.getY() - o.getY();
		final double vx = b.getX() - o.getX();
		final double vy = b.getY() - o.getY();
		return ux * vy - uy * vx;
	}

	public Point2D getO() {
		return o;
	}

	public Balloon getBalloonInside() {
		if (hasCurvation() == false) {
			throw new IllegalStateException();
		}
		return getBalloonWithFixedY(getCurvation());
	}

}