/**
 * Copyright 2010-2013 Jingjing Li.
 *
 * This file is part of jplot2d.
 *
 * jplot2d is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * jplot2d is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with jplot2d. If not, see .
 */
package org.jplot2d.sizing;

import java.awt.geom.Dimension2D;

import org.jplot2d.element.impl.PlotEx;

/**
 * The plot size will automatically fit the container size. The plot content size is changed as well.
 */
public class FillContainerSizeMode extends SizeMode {

	private final Dimension2D targetSize;

	private final double scale;

	/**
	 * The scale is fixed.
	 * 
	 * @param scale
	 *            the scale
	 */
	public FillContainerSizeMode(double scale) {
		super(false);
		this.targetSize = null;
		this.scale = scale;
	}

	/**
	 * The scale is calculated toward target size. The chart aspect ratio will automatically fit the container. The plot
	 * size is changed as well. The laying out is working on outer-to-inner mode.
	 * 
	 * @param targetSize
	 *            the target size
	 */
	public FillContainerSizeMode(Dimension2D targetSize) {
		super(false);
		if (targetSize.getWidth() <= 0 || targetSize.getHeight() <= 0) {
			throw new IllegalArgumentException("Target size must be positive, " + targetSize.getWidth() + "x"
					+ targetSize.getHeight() + " is invalid.");
		}
		this.targetSize = targetSize;
		this.scale = 1;
	}

	/**
	 * Returns the target size. If the scale is fixed, returns null
	 * 
	 * @return the target size
	 */
	public Dimension2D getTargetSize() {
		return targetSize;
	}

	public Result update(PlotEx plot) {
		Dimension2D containerSize = plot.getContainerSize();

		if (targetSize != null) {
			Dimension2D tcSize = targetSize;

			double scaleX = containerSize.getWidth() / tcSize.getWidth();
			double scaleY = containerSize.getHeight() / tcSize.getHeight();
			double scale = (scaleX < scaleY) ? scaleX : scaleY;

			double width = containerSize.getWidth() / scale;
			double height = containerSize.getHeight() / scale;

			return new Result(width, height, scale);

		} else {
			double width = containerSize.getWidth() / scale;
			double height = containerSize.getHeight() / scale;

			return new Result(width, height, scale);
		}

	}

	public String toString() {
		if (targetSize == null) {
			return "Fill container with scale " + scale;
		} else {
			return "Fill container with target size " + targetSize.getWidth() + "x" + targetSize.getHeight();
		}
	}

}