/**
 * Copyright 2010-2014 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.element.impl;

import java.awt.geom.Point2D;
import java.util.Locale;

import org.jplot2d.element.AxisTransform;
import org.jplot2d.element.Layer;
import org.jplot2d.element.Plot;
import org.jplot2d.element.VAlign;
import org.jplot2d.tex.MathElement;
import org.jplot2d.util.NumberUtils;

public class CoordinateAnnotationImpl extends SymbolAnnotationImpl implements CoordinateAnnotationEx {

	public CoordinateAnnotationImpl() {
		setVAlign(VAlign.TOP);
		setTextOffsetFactorX(0.8f);
		setTextOffsetFactorY(-0.8f);
	}

	public String getId() {
		if (getParent() != null) {
			return "ValuePicker" + getParent().indexOf(this);
		} else {
			return "ValuePicker@" + Integer.toHexString(System.identityHashCode(this));
		}
	}

	public MathElement getTextModel() {
		if (textModel != null) {
			return textModel;
		}

		Layer layer = getParent();
		Plot plot = (layer == null) ? null : layer.getParent();
		if (plot == null) {
			return null;
		}
		Point2D loc = getLocation();
		if (loc == null) {
			return null;
		}

		Point2D.Double p = (Point2D.Double) plot.getPaperTransform().getPtoD(loc);

		AxisTransform xat = layer.getXAxisTransform();
		double nx = plot.getPaperTransform().getXDtoP(p.x) / plot.getContentSize().getWidth();
		double nxL = plot.getPaperTransform().getXDtoP(p.x - 1) / plot.getContentSize().getWidth();
		double nxH = plot.getPaperTransform().getXDtoP(p.x + 1) / plot.getContentSize().getWidth();
		double vx = xat.getNormalTransform().convFromNR(nx);
		double deltaXL = Math.abs(xat.getNormalTransform().convFromNR(nxL) - vx);
		double deltaXH = Math.abs(xat.getNormalTransform().convFromNR(nxH) - vx);
		String xformat = NumberUtils.calcDeltaFormatStr(vx, Math.min(deltaXL, deltaXH) / 2);

		AxisTransform yat = layer.getYAxisTransform();
		double ny = plot.getPaperTransform().getYDtoP(p.y) / plot.getContentSize().getHeight();
		double nyL = plot.getPaperTransform().getYDtoP(p.y - 1) / plot.getContentSize().getHeight();
		double nyH = plot.getPaperTransform().getYDtoP(p.y + 1) / plot.getContentSize().getHeight();
		double vy = xat.getNormalTransform().convFromNR(ny);
		double deltaYL = Math.abs(yat.getNormalTransform().convFromNR(nyL) - vy);
		double deltaYH = Math.abs(yat.getNormalTransform().convFromNR(nyH) - vy);
		String yformat = NumberUtils.calcDeltaFormatStr(vy, Math.min(deltaYL, deltaYH) / 2);

		StringBuilder sb = new StringBuilder();
		sb.append(String.format((Locale) null, xformat, vx));
		sb.append(", ");
		sb.append(String.format((Locale) null, yformat, vy));

		setText(sb.toString());

		return textModel;
	}

	public void setValuePoint(double x, double y) {
		super.setValuePoint(x, y);
		setTextModel(null);
	}

}