/*
 * This file is part of aion-emu <aion-emu.com>.
 *
 * aion-emu is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * aion-emu 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with aion-emu.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.aionemu.gameserver.model.geometry;

import java.awt.Point;

import com.aionemu.gameserver.utils.MathUtil;

/**
 * This class implements cylinder area
 * 
 * @author SoulKeeper
 */
public class CylinderArea extends AbstractArea
{

	/**
	 * Center of cylinder
	 */
	private final int	centerX;

	/**
	 * Center of cylinder
	 */
	private final int	centerY;

	/**
	 * Cylinder radius
	 */
	private final int	radius;

	/**
	 * Creates new cylinder with given radius
	 * 
	 * @param center
	 *            center of the circle
	 * @param radius
	 *            radius of the circle
	 * @param minZ
	 *            min z
	 * @param maxZ
	 *            max z
	 */
	public CylinderArea(Point center, int radius, int minZ, int maxZ)
	{
		this(center.x, center.y, radius, minZ, maxZ);
	}

	/**
	 * Creates new cylider with given radius
	 * 
	 * @param x
	 *            center coord
	 * @param y
	 *            center coord
	 * @param radius
	 *            radius of the circle
	 * @param minZ
	 *            min z
	 * @param maxZ
	 *            max z
	 */
	public CylinderArea(int x, int y, int radius, int minZ, int maxZ)
	{
		super(minZ, maxZ);
		this.centerX = x;
		this.centerY = y;
		this.radius = radius;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public boolean isInside2D(int x, int y)
	{
		return MathUtil.getDistance(centerX, centerY, x, y) < radius;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public double getDistance2D(int x, int y)
	{
		if(isInside2D(x, y))
		{
			return 0;
		}
		else
		{
			return Math.abs(MathUtil.getDistance(centerX, centerY, x, y) - radius);
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public double getDistance3D(int x, int y, int z)
	{
		if(isInside3D(x, y, z))
		{
			return 0;
		}
		else if(isInsideZ(z))
		{
			return getDistance2D(x, y);
		}
		else
		{
			if(z < getMinZ())
			{
				return MathUtil.getDistance(centerX, centerY, getMinZ(), x, y, z);
			}
			else
			{
				return MathUtil.getDistance(centerX, centerY, getMaxZ(), x, y, z);
			}
		}
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public Point getClosestPoint(int x, int y)
	{
		if(isInside2D(x, y))
		{
			return new Point(x, y);
		}
		else
		{
			int vX = x - this.centerX;
			int vY = y - this.centerY;
			double magV = MathUtil.getDistance(centerX, centerY, x, y);
			double pointX = centerX + vX / magV * radius;
			double pointY = centerY + vY / magV * radius;
			return new Point((int) Math.round(pointX), (int) Math.round(pointY));
		}
	}
}