/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
 * Copyright (C) 2014 - 2020 ImageJ developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    and/or other materials provided with the distribution.
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package net.imagej.ops.geom.geom2d;

import java.util.ArrayList;
import java.util.List;

import net.imagej.ops.Ops;
import net.imagej.ops.geom.GeomUtils;
import net.imagej.ops.special.function.AbstractUnaryFunctionOp;
import net.imglib2.RealLocalizable;
import net.imglib2.RealPoint;
import net.imglib2.roi.geom.real.DefaultWritablePolygon2D;
import net.imglib2.roi.geom.real.Polygon2D;

import org.scijava.plugin.Plugin;

/**
 * Generic implementation of {@code geom.boundingBox}.
 *
 * @author Daniel Seebacher (University of Konstanz)
 */
@Plugin(type = Ops.Geometric.BoundingBox.class)
public class DefaultBoundingBox extends
	AbstractUnaryFunctionOp<Polygon2D, Polygon2D> implements
	Ops.Geometric.BoundingBox
{

	@Override
	public Polygon2D calculate(final Polygon2D input) {
		double min_x = Double.POSITIVE_INFINITY;
		double max_x = Double.NEGATIVE_INFINITY;
		double min_y = Double.POSITIVE_INFINITY;
		double max_y = Double.NEGATIVE_INFINITY;

		for (final RealLocalizable rl : GeomUtils.vertices(input)) {
			if (rl.getDoublePosition(0) < min_x) {
				min_x = rl.getDoublePosition(0);
			}
			if (rl.getDoublePosition(0) > max_x) {
				max_x = rl.getDoublePosition(0);
			}
			if (rl.getDoublePosition(1) < min_y) {
				min_y = rl.getDoublePosition(1);
			}
			if (rl.getDoublePosition(1) > max_y) {
				max_y = rl.getDoublePosition(1);
			}
		}

		final List<RealLocalizable> bounds = new ArrayList<>();

		bounds.add(new RealPoint(min_x, min_y));
		bounds.add(new RealPoint(min_x, max_y));
		bounds.add(new RealPoint(max_x, max_y));
		bounds.add(new RealPoint(max_x, min_y));

		return new DefaultWritablePolygon2D(bounds);
	}

}