/**
 * Copyright 2010-2012 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.data;

import org.jplot2d.util.Range;

/**
 * Immutable. This class keep (x,y) image data and compute data feature such as max/min, NaN indexes.
 * 
 * @author Jingjing Li
 */
public abstract class ImageData implements GraphData {

	private final int imgWidth, imgHeight;

	protected final Range xboundary;

	protected final Range yboundary;

	protected final ImageCoordinateReference coordref;

	private double xmin, xmax;

	private double ymin, ymax;

	protected ImageData(int w, int h, ImageCoordinateReference cr, Range xboundary, Range yboundary) {
		this.imgWidth = w;
		this.imgHeight = h;
		this.coordref = new ImageCoordinateReference(cr);
		this.xboundary = xboundary;
		this.yboundary = yboundary;

		updateRanges();
	}

	public int getWidth() {
		return imgWidth;
	}

	public int getHeight() {
		return imgHeight;
	}

	protected void updateRanges() {
		xmin = coordref.xRefVal - (coordref.xRefPixel - 0.5) * coordref.xDelta;
		xmax = xmin + imgWidth * coordref.xDelta;
		ymin = coordref.yRefVal - (coordref.yRefPixel - 0.5) * coordref.yDelta;
		ymax = ymin + imgHeight * coordref.yDelta;

		if (!inXBoundary(xmin)) {
			xmin = xboundary.getMin();
		}
		if (!inXBoundary(xmax)) {
			xmax = xboundary.getMax();
		}
		if (!inYBoundary(ymin)) {
			ymin = yboundary.getMin();
		}
		if (!inXBoundary(ymax)) {
			ymax = yboundary.getMax();
		}
	}

	/**
	 * Returns true if the given x is in the x boundary
	 */
	private boolean inXBoundary(double x) {
		return (xboundary == null) ? true : xboundary.contains(x);
	}

	/**
	 * Returns true if the given y is in the y boundary
	 */
	private boolean inYBoundary(double y) {
		return (yboundary == null) ? true : yboundary.contains(y);
	}

	public Range getXRange() {
		return new Range.Double(xmin, xmax);
	}

	public Range getYRange() {
		return new Range.Double(ymin, ymax);
	}

	public boolean hasPointOutsideXBounds() {
		return false;
	}

	public boolean hasPointOutsideYBounds() {
		return false;
	}

	public ImageCoordinateReference getCoordinateReference() {
		return new ImageCoordinateReference(coordref);
	}

	public abstract ImageData applyCoordinateReference(ImageCoordinateReference cr);

	/**
	 * Get the coordinate reference value of the X axis
	 * 
	 * @return the coordinate reference value of the X axis
	 */
	public double getXcrval() {
		return coordref.xRefVal;
	}

	/**
	 * Get the coordinate reference value of the Y axis
	 * 
	 * @return the coordinate reference value of the Y axis
	 */
	public double getYcrval() {
		return coordref.yRefVal;
	}

	/**
	 * Get the coordinate reference pixel in the X axis
	 * 
	 * @return the coordinate reference pixel in the X axis
	 */
	public double getXcrpix() {
		return coordref.xRefPixel;
	}

	/**
	 * Get the coordinate reference pixel in the Y axis
	 * 
	 * @return the coordinate reference pixel in the Y axis
	 */
	public double getYcrpix() {
		return coordref.yRefPixel;
	}

	/**
	 * Get the pixel size in the X direction
	 * 
	 * @return the pixel size in the X direction
	 */
	public double getXcdelt() {
		return coordref.xDelta;
	}

	/**
	 * Get the pixel size in the Y direction
	 * 
	 * @return the pixel size in the Y direction
	 */
	public double getYcdelt() {
		return coordref.yDelta;
	}

}