/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   *  Redistributions of source code must retain the above copyright notice,
 *      this list of conditions and the following disclaimer.
 *
 *   *  Redistributions in binary form must reproduce the above copyright notice,
 *      this list of conditions and the following disclaimer in the documentation
 *      and/or other materials provided with the distribution.
 *
 *   *  Neither the name of the University of Southampton nor the names of its
 *      contributors may be used to endorse or promote products derived from this
 *      software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.math.geometry.point;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Random;
import java.util.Scanner;

import Jama.Matrix;

/**
 * Simple concrete implementation of a two dimensional point.
 *
 * @author Jonathon Hare
 */
public class Point2dImpl implements Point2d, Cloneable {
        /**
         * The x-coordinate
         */
        public float x;

        /**
         * The y-coordinate
         */
        public float y;

        /**
         * Construct a Point2dImpl with the given (x, y) coordinates
         *
         * @param x
         *            x-coordinate
         * @param y
         *            y-coordinate
         */
        public Point2dImpl(float x, float y)
        {
                this.x = x;
                this.y = y;
        }

        /**
         * Construct a Point2dImpl with the (x,y) coordinates given via another
         * point.
         *
         * @param p
         *            The point to copy from.
         */
        public Point2dImpl(Point2d p)
        {
                this.copyFrom(p);
        }

        /**
         * Construct a Point2dImpl at the origin.
         */
        public Point2dImpl()
        {
                // do nothing
        }

        /**
         * Construct a {@link Point2dImpl} using the first two ordinates of a
         * {@link Coordinate}.
         *
         * @param coord
         *            the {@link Coordinate}
         */
        public Point2dImpl(Coordinate coord) {
                x = coord.getOrdinate(0).floatValue();
                y = coord.getOrdinate(1).floatValue();
        }

        /**
         * Construct a Point2dImpl with the given (x, y) coordinates. The values
         * will be cast to single precision.
         *
         * @param x
         *            x-coordinate
         * @param y
         *            y-coordinate
         */
        public Point2dImpl(double x, double y)
        {
                this.x = (float) x;
                this.y = (float) y;
        }

        @Override
        public float getX() {
                return x;
        }

        @Override
        public void setX(float x) {
                this.x = x;
        }

        @Override
        public float getY() {
                return y;
        }

        @Override
        public void setY(float y) {
                this.y = y;
        }

        @Override
        public void copyFrom(Point2d p)
        {
                this.x = p.getX();
                this.y = p.getY();
        }

        @Override
        public String toString() {
                return "(" + x + "," + y + ")";
        }

        @Override
        public Point2dImpl clone() {
                Point2dImpl clone;
                try {
                        clone = (Point2dImpl) super.clone();
                } catch (final CloneNotSupportedException e) {
                        return null;
                }
                return clone;
        }

        @Override
        public Float getOrdinate(int dimension) {
                if (dimension == 0)
                        return x;
                return y;
        }

        @Override
        public int getDimensions() {
                return 2;
        }

        @Override
        public void translate(float x, float y) {
                this.x += x;
                this.y += y;
        }

        @Override
        public void translate(Point2d v) {
                this.x += v.getX();
                this.y += v.getY();
        }

        @Override
        public Point2dImpl transform(Matrix transform) {
                if (transform.getRowDimension() == 3) {
                        float xt = (float) transform.get(0, 0) * getX() + (float) transform.get(0, 1) * getY()
                                        + (float) transform.get(0, 2);
                        float yt = (float) transform.get(1, 0) * getX() + (float) transform.get(1, 1) * getY()
                                        + (float) transform.get(1, 2);
                        final float zt = (float) transform.get(2, 0) * getX() + (float) transform.get(2, 1) * getY()
                                        + (float) transform.get(2, 2);

                        xt /= zt;
                        yt /= zt;

                        return new Point2dImpl(xt, yt);
                } else if (transform.getRowDimension() == 2 && transform.getColumnDimension() == 2) {
                        final float xt = (float) transform.get(0, 0) * getX() + (float) transform.get(0, 1) * getY();
                        final float yt = (float) transform.get(1, 0) * getX() + (float) transform.get(1, 1) * getY();

                        return new Point2dImpl(xt, yt);
                } else if (transform.getRowDimension() == 2 && transform.getColumnDimension() == 3) {
                        final float xt = (float) transform.get(0, 0) * getX() + (float) transform.get(0, 1) * getY()
                                        + (float) transform.get(0, 2);
                        final float yt = (float) transform.get(1, 0) * getX() + (float) transform.get(1, 1) * getY()
                                        + (float) transform.get(1, 2);

                        return new Point2dImpl(xt, yt);
                }
                throw new IllegalArgumentException("Transform matrix has unexpected size");
        }

        @Override
        public boolean equals(Object o) {
                if (!(o instanceof Point2d))
                        return false;
                final Point2d p = (Point2d) o;
                return p.getX() == this.x && p.getY() == this.y;
        }

        @Override
        public int hashCode()
        {
                return toString().hashCode();
        }

        @Override
        public Point2d minus(Point2d a) {
                return new Point2dImpl(this.x - a.getX(), this.y - a.getY());
        }

        @Override
        public void readASCII(Scanner in) throws IOException {
                x = in.nextFloat();
                y = in.nextFloat();
        }

        @Override
        public String asciiHeader() {
                return "Point2d";
        }

        @Override
        public void readBinary(DataInput in) throws IOException {
                x = in.readFloat();
                y = in.readFloat();
        }

        @Override
        public byte[] binaryHeader() {
                return "PT2D".getBytes();
        }

        @Override
        public void writeASCII(PrintWriter out) throws IOException {
                out.format("%f %f", x, y);
        }

        @Override
        public void writeBinary(DataOutput out) throws IOException {
                out.writeFloat(x);
                out.writeFloat(y);
        }

        @Override
        public Point2dImpl copy() {
                return clone();
        }

        /**
         * Create a random point in ([0..1], [0..1]).
         *
         * @return random point.
         */
        public static Point2d createRandomPoint() {
                return new Point2dImpl((float) Math.random(), (float) Math.random());
        }

        /**
         * Create a random point in ([0..1], [0..1]) with the given random number
         * generator.
         *
         * @param rng
         *            the random number generator
         * @return random point.
         */
        public static Point2d createRandomPoint(Random rng) {
                return new Point2dImpl(rng.nextFloat(), rng.nextFloat());
        }

        /**
         * @param calculateCentroid
         * @return a point from a double array
         */
        public static Point2d fromDoubleArray(double[] calculateCentroid) {
                return new Point2dImpl((float) calculateCentroid[0], (float) calculateCentroid[1]);
        }

        @Override
        public void setOrdinate(int dimension, Number value) {
                if (dimension == 0)
                        x = value.floatValue();
                if (dimension == 1)
                        y = value.floatValue();
        }
}