/*-
 *  Copyright 2020 Beuth Hochschule für Technik Berlin, Hochschule für Technik Stuttgart
 * 
 *  This file is part of CityDoctor2.
 *
 *  CityDoctor2 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
 *  (at your option) any later version.
 *
 *  CityDoctor2 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with CityDoctor2.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.hft.stuttgart.citydoctor2.parser;

import java.io.Serializable;

import org.locationtech.proj4j.BasicCoordinateTransform;
import org.locationtech.proj4j.CRSFactory;
import org.locationtech.proj4j.CoordinateReferenceSystem;

/**
 * Container class to store the configuration needed to parse a file. Also
 * contains information on transformation of vertices.
 * 
 * @author Matthias Betz
 *
 */
public class ParserConfiguration implements Serializable {

	private static final long serialVersionUID = 6209047092991074661L;

	private static final CRSFactory CRS_FACTORY = new CRSFactory();

	private int roundingPlaces = 8;

	private boolean validate = false;
	private transient BasicCoordinateTransform targetTransform = null;
	private transient BasicCoordinateTransform originalTransform = null;

	private String targetTransformString;
	private String originalTransformString;
	private boolean hasTransformation = false;
	private boolean useLowMemoryConsumption = false;

	private transient double fromMetres = 1.0;

	public ParserConfiguration(int numberOfRoundingPlaces, boolean validate) {
		this(numberOfRoundingPlaces, validate, false);
	}
	
	public ParserConfiguration(int numberOfRoundingPlaces, boolean validate, boolean lowMemory) {
		if (numberOfRoundingPlaces < 0) {
			throw new IllegalArgumentException("Number of rounding places must be a positive value");
		}
		roundingPlaces = numberOfRoundingPlaces;
		this.validate = validate;
		useLowMemoryConsumption = lowMemory;
	}

	public boolean getValidate() {
		return validate;
	}

	public int getNumberOfRoundingPlaces() {
		return roundingPlaces;
	}

	public void setCoordinateSystem(CoordinateReferenceSystem crs, CoordinateReferenceSystem tgtCrs) {
		if (crs != null && tgtCrs != null) {
			hasTransformation = true;
			targetTransformString = tgtCrs.getParameterString();
			originalTransformString = crs.getParameterString();
			targetTransform = new BasicCoordinateTransform(crs, tgtCrs);
			originalTransform = new BasicCoordinateTransform(tgtCrs, crs);
		}
	}

	public BasicCoordinateTransform getTargetTransform() {
		if (hasTransformation && targetTransform == null) {
			createCoordinateTransforms();
		}
		return targetTransform;
	}

	private void createCoordinateTransforms() {
		CoordinateReferenceSystem tgtCrs = null;
		CoordinateReferenceSystem crs = null;
		synchronized (CRS_FACTORY) {
			tgtCrs = CRS_FACTORY.createFromParameters("Target", targetTransformString);
			crs = CRS_FACTORY.createFromParameters("Original", originalTransformString);
		}
		targetTransform = new BasicCoordinateTransform(crs, tgtCrs);
		originalTransform = new BasicCoordinateTransform(tgtCrs, crs);
	}

	public BasicCoordinateTransform getOriginalTransform() {
		if (hasTransformation && originalTransform == null) {
			createCoordinateTransforms();
		}
		return originalTransform;
	}

	public void setFromMetres(double d) {
		fromMetres = d;
	}

	public double getFromMetres() {
		return fromMetres;
	}
	
	public boolean useLowMemoryConsumption() {
		return useLowMemoryConsumption;
	}

}
