/** *****************************************************************************
 * Copyright (c) 2013, Daniel Murphy
 * 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.
 *
 * 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 HOLDER 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.jbox2d.common;

import java.io.Serializable;

/**
 * @author Daniel Murphy
 */
public class Vec3 implements Serializable {

    private static final long serialVersionUID = 102913558223451982L;
    public float x, y, z;

    public Vec3() {
        x = y = z = 0f;
    }

    public Vec3(float argX, float argY, float argZ) {
        x = argX;
        y = argY;
        z = argZ;
    }

    public Vec3(Vec3 copy) {
        x = copy.x;
        y = copy.y;
        z = copy.z;
    }

    public Vec3 set(Vec3 vec) {
        x = vec.x;
        y = vec.y;
        z = vec.z;
        return this;
    }

    public Vec3 set(float argX, float argY, float argZ) {
        x = argX;
        y = argY;
        z = argZ;
        return this;
    }

    public Vec3 addLocal(Vec3 argVec) {
        x += argVec.x;
        y += argVec.y;
        z += argVec.z;
        return this;
    }

    public Vec3 add(Vec3 argVec) {
        return new Vec3(x + argVec.x, y + argVec.y, z + argVec.z);
    }

    public Vec3 subLocal(Vec3 argVec) {
        x -= argVec.x;
        y -= argVec.y;
        z -= argVec.z;
        return this;
    }

    public Vec3 sub(Vec3 argVec) {
        return new Vec3(x - argVec.x, y - argVec.y, z - argVec.z);
    }

    public Vec3 mulLocal(float argScalar) {
        x *= argScalar;
        y *= argScalar;
        z *= argScalar;
        return this;
    }

    public Vec3 mul(float argScalar) {
        return new Vec3(x * argScalar, y * argScalar, z * argScalar);
    }

    public Vec3 negate() {
        return new Vec3(-x, -y, -z);
    }

    public Vec3 negateLocal() {
        x = -x;
        y = -y;
        z = -z;
        return this;
    }

    public void setZero() {
        x = 0;
        y = 0;
        z = 0;
    }

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

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + Float.floatToIntBits(x);
        result = prime * result + Float.floatToIntBits(y);
        result = prime * result + Float.floatToIntBits(z);
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        Vec3 other = (Vec3) obj;
        if (Float.floatToIntBits(x) != Float.floatToIntBits(other.x)) {
            return false;
        }
        if (Float.floatToIntBits(y) != Float.floatToIntBits(other.y)) {
            return false;
        }
        return (Float.floatToIntBits(z) == Float.floatToIntBits(other.z));
    }

    public final static float dot(Vec3 a, Vec3 b) {
        return a.x * b.x + a.y * b.y + a.z * b.z;
    }

    public final static Vec3 cross(Vec3 a, Vec3 b) {
        return new Vec3(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);
    }

    public final static void crossToOut(Vec3 a, Vec3 b, Vec3 out) {
        final float tempy = a.z * b.x - a.x * b.z;
        final float tempz = a.x * b.y - a.y * b.x;
        out.x = a.y * b.z - a.z * b.y;
        out.y = tempy;
        out.z = tempz;
    }

    public final static void crossToOutUnsafe(Vec3 a, Vec3 b, Vec3 out) {
        assert (out != b);
        assert (out != a);
        out.x = a.y * b.z - a.z * b.y;
        out.y = a.z * b.x - a.x * b.z;
        out.z = a.x * b.y - a.y * b.x;
    }
}