Cuboid

package fr.hugo4715.paytoprotect.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.bukkit.Bukkit;
import org.bukkit.Chunk;
import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.configuration.serialization.ConfigurationSerializable;

/**
 * This class is a region/cuboid from one location to another. It can be used for blocks protection and things like WorldEdit.
 * From: https://bukkit.org/threads/protection-region-cuboid-creation.164161/
 * @author desht (Original code), KingFaris10 (Editor of code) 
 */
public class Cuboid implements Iterable<Block>, Cloneable, ConfigurationSerializable {
	protected final String worldName;
	protected final int x1, y1, z1;
	protected final int x2, y2, z2;

	/**
	 * Construct a Cuboid given two Location objects which represent any two corners of the Cuboid.
	 * Note: The 2 locations must be on the same world.
	 * 
	 * @param l1 - One of the corners
	 * @param l2 - The other corner
	 */
	public Cuboid(Location l1, Location l2) {
		if (!l1.getWorld().equals(l2.getWorld())) throw new IllegalArgumentException("Locations must be on the same world");
		this.worldName = l1.getWorld().getName();
		this.x1 = Math.min(l1.getBlockX(), l2.getBlockX());
		this.y1 = Math.min(l1.getBlockY(), l2.getBlockY());
		this.z1 = Math.min(l1.getBlockZ(), l2.getBlockZ());
		this.x2 = Math.max(l1.getBlockX(), l2.getBlockX());
		this.y2 = Math.max(l1.getBlockY(), l2.getBlockY());
		this.z2 = Math.max(l1.getBlockZ(), l2.getBlockZ());
	}

	/**
	 * Construct a one-block Cuboid at the given Location of the Cuboid.
	 * 
	 * @param l1 location of the Cuboid
	 */
	public Cuboid(Location l1) {
		this(l1, l1);
	}

	/**
	 * Copy constructor.
	 * 
	 * @param other - The Cuboid to copy
	 */
	public Cuboid(Cuboid other) {
		this(other.getWorld().getName(), other.x1, other.y1, other.z1, other.x2, other.y2, other.z2);
	}

	/**
	 * Construct a Cuboid in the given World and xyz co-ordinates
	 * 
	 * @param world - The Cuboid's world
	 * @param x1 - X co-ordinate of corner 1
	 * @param y1 - Y co-ordinate of corner 1
	 * @param z1 - Z co-ordinate of corner 1
	 * @param x2 - X co-ordinate of corner 2
	 * @param y2 - Y co-ordinate of corner 2
	 * @param z2 - Z co-ordinate of corner 2
	 */
	public Cuboid(World world, int x1, int y1, int z1, int x2, int y2, int z2) {
		this.worldName = world.getName();
		this.x1 = Math.min(x1, x2);
		this.x2 = Math.max(x1, x2);
		this.y1 = Math.min(y1, y2);
		this.y2 = Math.max(y1, y2);
		this.z1 = Math.min(z1, z2);
		this.z2 = Math.max(z1, z2);
	}

	/**
	 * Construct a Cuboid in the given world name and xyz co-ordinates.
	 * 
	 * @param worldName - The Cuboid's world name
	 * @param x1 - X co-ordinate of corner 1
	 * @param y1 - Y co-ordinate of corner 1
	 * @param z1 - Z co-ordinate of corner 1
	 * @param x2 - X co-ordinate of corner 2
	 * @param y2 - Y co-ordinate of corner 2
	 * @param z2 - Z co-ordinate of corner 2
	 */
	private Cuboid(String worldName, int x1, int y1, int z1, int x2, int y2, int z2) {
		this.worldName = worldName;
		this.x1 = Math.min(x1, x2);
		this.x2 = Math.max(x1, x2);
		this.y1 = Math.min(y1, y2);
		this.y2 = Math.max(y1, y2);
		this.z1 = Math.min(z1, z2);
		this.z2 = Math.max(z1, z2);
	}

	/**
	 * Construct a Cuboid using a map with the following keys: worldName, x1, x2, y1, y2, z1, z2
	 * @param map - The map of keys.
	 */
	public Cuboid(Map<String, Object> map) {
		this.worldName = (String) map.get("worldName");
		this.x1 = (Integer) map.get("x1");
		this.x2 = (Integer) map.get("x2");
		this.y1 = (Integer) map.get("y1");
		this.y2 = (Integer) map.get("y2");
		this.z1 = (Integer) map.get("z1");
		this.z2 = (Integer) map.get("z2");
	}

	@Override
	public Map<String, Object> serialize() {
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("worldName", this.worldName);
		map.put("x1", this.x1);
		map.put("y1", this.y1);
		map.put("z1", this.z1);
		map.put("x2", this.x2);
		map.put("y2", this.y2);
		map.put("z2", this.z2);
		return map;
	}

	/**
	 * Get the Location of the lower northeast corner of the Cuboid (minimum XYZ co-ordinates).
	 * 
	 * @return Location of the lower northeast corner
	 */
	public Location getLowerNE() {
		return new Location(this.getWorld(), this.x1, this.y1, this.z1);
	}

	/**
	 * Get the Location of the upper southwest corner of the Cuboid (maximum XYZ co-ordinates).
	 * 
	 * @return Location of the upper southwest corner
	 */
	public Location getUpperSW() {
		return new Location(this.getWorld(), this.x2, this.y2, this.z2);
	}

	/**
	 * Get the blocks in the Cuboid.
	 * 
	 * @return The blocks in the Cuboid
	 */
	public List<Block> getBlocks() {
		Iterator<Block> blockI = this.iterator();
		List<Block> copy = new ArrayList<Block>();
		while (blockI.hasNext())
			copy.add(blockI.next());
		return copy;
	}

	/**
	 * Get the the centre of the Cuboid.
	 * 
	 * @return Location at the centre of the Cuboid
	 */
	public Location getCenter() {
		int x1 = this.getUpperX() + 1;
		int y1 = this.getUpperY() + 1;
		int z1 = this.getUpperZ() + 1;
		return new Location(this.getWorld(), this.getLowerX() + (x1 - this.getLowerX()) / 2.0, this.getLowerY() + (y1 - this.getLowerY()) / 2.0, this.getLowerZ() + (z1 - this.getLowerZ()) / 2.0);
	}

	/**
	 * Get the Cuboid's world.
	 *
	 * @return The World object representing this Cuboid's world
	 * @throws IllegalStateException if the world is not loaded
	 */
	public World getWorld() {
		World world = Bukkit.getWorld(this.worldName);
		if (world == null) throw new IllegalStateException("World '" + this.worldName + "' is not loaded");
		return world;
	}

	/**
	 * Get the size of this Cuboid along the X axis
	 * 
	 * @return	Size of Cuboid along the X axis
	 */
	public int getSizeX() {
		return (this.x2 - this.x1) + 1;
	}

	/**
	 * Get the size of this Cuboid along the Y axis
	 * 
	 * @return	Size of Cuboid along the Y axis
	 */
	public int getSizeY() {
		return (this.y2 - this.y1) + 1;
	}

	/**
	 * Get the size of this Cuboid along the Z axis
	 * 
	 * @return	Size of Cuboid along the Z axis
	 */
	public int getSizeZ() {
		return (this.z2 - this.z1) + 1;
	}

	/**
	 * Get the minimum X co-ordinate of this Cuboid
	 * 
	 * @return	the minimum X co-ordinate
	 */
	public int getLowerX() {
		return this.x1;
	}

	/**
	 * Get the minimum Y co-ordinate of this Cuboid
	 * 
	 * @return	the minimum Y co-ordinate
	 */
	public int getLowerY() {
		return this.y1;
	}

	/**
	 * Get the minimum Z co-ordinate of this Cuboid
	 * 
	 * @return	the minimum Z co-ordinate
	 */
	public int getLowerZ() {
		return this.z1;
	}

	/**
	 * Get the maximum X co-ordinate of this Cuboid
	 * 
	 * @return	the maximum X co-ordinate
	 */
	public int getUpperX() {
		return this.x2;
	}

	/**
	 * Get the maximum Y co-ordinate of this Cuboid
	 * 
	 * @return	the maximum Y co-ordinate
	 */
	public int getUpperY() {
		return this.y2;
	}

	/**
	 * Get the maximum Z co-ordinate of this Cuboid
	 * 
	 * @return	the maximum Z co-ordinate
	 */
	public int getUpperZ() {
		return this.z2;
	}

	/**
	 * Get the Blocks at the eight corners of the Cuboid.
	 *
	 * @return array of Block objects representing the Cuboid corners
	 */
	public Block[] corners() {
		Block[] res = new Block[8];
		World w = this.getWorld();
		res[0] = w.getBlockAt(this.x1, this.y1, this.z1);
		res[1] = w.getBlockAt(this.x1, this.y1, this.z2);
		res[2] = w.getBlockAt(this.x1, this.y2, this.z1);
		res[3] = w.getBlockAt(this.x1, this.y2, this.z2);
		res[4] = w.getBlockAt(this.x2, this.y1, this.z1);
		res[5] = w.getBlockAt(this.x2, this.y1, this.z2);
		res[6] = w.getBlockAt(this.x2, this.y2, this.z1);
		res[7] = w.getBlockAt(this.x2, this.y2, this.z2);
		return res;
	}

	/**
	 * Expand the Cuboid in the given direction by the given amount.  Negative amounts will shrink the Cuboid in the given direction.  Shrinking a cuboid's face past the opposite face is not an error and will return a valid Cuboid.
	 * 
	 * @param dir - The direction in which to expand
	 * @param amount - The number of blocks by which to expand
	 * @return A new Cuboid expanded by the given direction and amount
	 */
	public Cuboid expand(CuboidDirection dir, int amount) {
		switch (dir) {
		case North:
			return new Cuboid(this.worldName, this.x1 - amount, this.y1, this.z1, this.x2, this.y2, this.z2);
		case South:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2 + amount, this.y2, this.z2);
		case East:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1 - amount, this.x2, this.y2, this.z2);
		case West:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, this.y2, this.z2 + amount);
		case Down:
			return new Cuboid(this.worldName, this.x1, this.y1 - amount, this.z1, this.x2, this.y2, this.z2);
		case Up:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, this.y2 + amount, this.z2);
		default:
			throw new IllegalArgumentException("Invalid direction " + dir);
		}
	}

	/**
	 * Shift the Cuboid in the given direction by the given amount.
	 * 
	 * @param dir - The direction in which to shift
	 * @param amount - The number of blocks by which to shift
	 * @return A new Cuboid shifted by the given direction and amount
	 */
	public Cuboid shift(CuboidDirection dir, int amount) {
		return expand(dir, amount).expand(dir.opposite(), -amount);
	}

	/**
	 * Outset (grow) the Cuboid in the given direction by the given amount.
	 * 
	 * @param dir - The direction in which to outset (must be Horizontal, Vertical, or Both)
	 * @param amount - The number of blocks by which to outset
	 * @return A new Cuboid outset by the given direction and amount
	 */
	public Cuboid outset(CuboidDirection dir, int amount) {
		Cuboid c;
		switch (dir) {
		case Horizontal:
			c = expand(CuboidDirection.North, amount).expand(CuboidDirection.South, amount).expand(CuboidDirection.East, amount).expand(CuboidDirection.West, amount);
			break;
		case Vertical:
			c = expand(CuboidDirection.Down, amount).expand(CuboidDirection.Up, amount);
			break;
		case Both:
			c = outset(CuboidDirection.Horizontal, amount).outset(CuboidDirection.Vertical, amount);
			break;
		default:
			throw new IllegalArgumentException("Invalid direction " + dir);
		}
		return c;
	}

	/**
	 * Inset (shrink) the Cuboid in the given direction by the given amount.  Equivalent
	 * to calling outset() with a negative amount.
	 * 
	 * @param dir - The direction in which to inset (must be Horizontal, Vertical, or Both)
	 * @param amount - The number of blocks by which to inset
	 * @return A new Cuboid inset by the given direction and amount
	 */
	public Cuboid inset(CuboidDirection dir, int amount) {
		return this.outset(dir, -amount);
	}

	/**
	 * Return true if the point at (x,y,z) is contained within this Cuboid.
	 * 
	 * @param x	- The X co-ordinate
	 * @param y	- The Y co-ordinate
	 * @param z	- The Z co-ordinate
	 * @return true if the given point is within this Cuboid, false otherwise
	 */
	public boolean contains(int x, int y, int z) {
		return x >= this.x1 && x <= this.x2 && y >= this.y1 && y <= this.y2 && z >= this.z1 && z <= this.z2;
	}

	/**
	 * Check if the given Block is contained within this Cuboid.
	 * 
	 * @param b	- The Block to check for
	 * @return true if the Block is within this Cuboid, false otherwise
	 */
	public boolean contains(Block b) {
		return this.contains(b.getLocation());
	}

	/**
	 * Check if the given Location is contained within this Cuboid.
	 * 
	 * @param l	- The Location to check for
	 * @return true if the Location is within this Cuboid, false otherwise
	 */
	public boolean contains(Location l) {
		if (!this.worldName.equals(l.getWorld().getName())) return false;
		return this.contains(l.getBlockX(), l.getBlockY(), l.getBlockZ());
	}

	/**
	 * Get the volume of this Cuboid.
	 * 
	 * @return The Cuboid volume, in blocks
	 */
	public int getVolume() {
		return this.getSizeX() * this.getSizeY() * this.getSizeZ();
	}

	/**
	 * Get the average light level of all empty (air) blocks in the Cuboid.  Returns 0 if there are no empty blocks.
	 * 
	 * @return The average light level of this Cuboid
	 */
	public byte getAverageLightLevel() {
		long total = 0;
		int n = 0;
		for (Block b : this) {
			if (b.isEmpty()) {
				total += b.getLightLevel();
				++n;
			}
		}
		return n > 0 ? (byte) (total / n) : 0;
	}

	/**
	 * Contract the Cuboid, returning a Cuboid with any air around the edges removed, just large enough to include all non-air blocks.
	 * 
	 * @return A new Cuboid with no external air blocks
	 */
	public Cuboid contract() {
		return this.contract(CuboidDirection.Down).contract(CuboidDirection.South).contract(CuboidDirection.East).contract(CuboidDirection.Up).contract(CuboidDirection.North).contract(CuboidDirection.West);
	}

	/**
	 * Contract the Cuboid in the given direction, returning a new Cuboid which has no exterior empty space.
	 * E.g. A direction of Down will push the top face downwards as much as possible.
	 * 
	 * @param dir - The direction in which to contract
	 * @return A new Cuboid contracted in the given direction
	 */
	public Cuboid contract(CuboidDirection dir) {
		Cuboid face = getFace(dir.opposite());
		switch (dir) {
		case Down:
			while (face.containsOnly(0) && face.getLowerY() > this.getLowerY()) {
				face = face.shift(CuboidDirection.Down, 1);
			}
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, face.getUpperY(), this.z2);
		case Up:
			while (face.containsOnly(0) && face.getUpperY() < this.getUpperY()) {
				face = face.shift(CuboidDirection.Up, 1);
			}
			return new Cuboid(this.worldName, this.x1, face.getLowerY(), this.z1, this.x2, this.y2, this.z2);
		case North:
			while (face.containsOnly(0) && face.getLowerX() > this.getLowerX()) {
				face = face.shift(CuboidDirection.North, 1);
			}
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, face.getUpperX(), this.y2, this.z2);
		case South:
			while (face.containsOnly(0) && face.getUpperX() < this.getUpperX()) {
				face = face.shift(CuboidDirection.South, 1);
			}
			return new Cuboid(this.worldName, face.getLowerX(), this.y1, this.z1, this.x2, this.y2, this.z2);
		case East:
			while (face.containsOnly(0) && face.getLowerZ() > this.getLowerZ()) {
				face = face.shift(CuboidDirection.East, 1);
			}
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, this.y2, face.getUpperZ());
		case West:
			while (face.containsOnly(0) && face.getUpperZ() < this.getUpperZ()) {
				face = face.shift(CuboidDirection.West, 1);
			}
			return new Cuboid(this.worldName, this.x1, this.y1, face.getLowerZ(), this.x2, this.y2, this.z2);
		default:
			throw new IllegalArgumentException("Invalid direction " + dir);
		}
	}

	/**
	 * Get the Cuboid representing the face of this Cuboid.  The resulting Cuboid will be one block thick in the axis perpendicular to the requested face.
	 * 
	 * @param dir - which face of the Cuboid to get 
	 * @return The Cuboid representing this Cuboid's requested face
	 */
	public Cuboid getFace(CuboidDirection dir) {
		switch (dir) {
		case Down:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, this.y1, this.z2);
		case Up:
			return new Cuboid(this.worldName, this.x1, this.y2, this.z1, this.x2, this.y2, this.z2);
		case North:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x1, this.y2, this.z2);
		case South:
			return new Cuboid(this.worldName, this.x2, this.y1, this.z1, this.x2, this.y2, this.z2);
		case East:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z1, this.x2, this.y2, this.z1);
		case West:
			return new Cuboid(this.worldName, this.x1, this.y1, this.z2, this.x2, this.y2, this.z2);
		default:
			throw new IllegalArgumentException("Invalid direction " + dir);
		}
	}

	/**
	 * Check if the Cuboid contains only blocks of the given type
	 * 
	 * @param blockId - The block ID to check for
	 * @return true if this Cuboid contains only blocks of the given type
	 */
	public boolean containsOnly(int blockId) {
		for (Block b : this) {
			if (b.getTypeId() != blockId) return false;
		}
		return true;
	}

	/**
	 * Get the Cuboid big enough to hold both this Cuboid and the given one.
	 * 
	 * @param other - The other cuboid.
	 * @return A new Cuboid large enough to hold this Cuboid and the given Cuboid
	 */
	public Cuboid getBoundingCuboid(Cuboid other) {
		if (other == null) return this;

		int xMin = Math.min(this.getLowerX(), other.getLowerX());
		int yMin = Math.min(this.getLowerY(), other.getLowerY());
		int zMin = Math.min(this.getLowerZ(), other.getLowerZ());
		int xMax = Math.max(this.getUpperX(), other.getUpperX());
		int yMax = Math.max(this.getUpperY(), other.getUpperY());
		int zMax = Math.max(this.getUpperZ(), other.getUpperZ());

		return new Cuboid(this.worldName, xMin, yMin, zMin, xMax, yMax, zMax);
	}

	/**
	 * Get a block relative to the lower NE point of the Cuboid.
	 * 
	 * @param x	- The X co-ordinate
	 * @param y	- The Y co-ordinate
	 * @param z	- The Z co-ordinate
	 * @return The block at the given position
	 */
	public Block getRelativeBlock(int x, int y, int z) {
		return this.getWorld().getBlockAt(this.x1 + x, this.y1 + y, this.z1 + z);
	}

	/**
	 * Get a block relative to the lower NE point of the Cuboid in the given World.  This 
	 * version of getRelativeBlock() should be used if being called many times, to avoid
	 * excessive calls to getWorld().
	 * 
	 * @param w	- The world
	 * @param x	- The X co-ordinate	
	 * @param y	- The Y co-ordinate	
	 * @param z	- The Z co-ordinate	
	 * @return The block at the given position
	 */
	public Block getRelativeBlock(World w, int x, int y, int z) {
		return w.getBlockAt(this.x1 + x, y1 + y, this.z1 + z);
	}

	/**
	 * Get a list of the chunks which are fully or partially contained in this cuboid.
	 * 
	 * @return A list of Chunk objects
	 */
	public List<Chunk> getChunks() {
		List<Chunk> res = new ArrayList<Chunk>();

		World w = this.getWorld();
		int x1 = this.getLowerX() & ~0xf;
		int x2 = this.getUpperX() & ~0xf;
		int z1 = this.getLowerZ() & ~0xf;
		int z2 = this.getUpperZ() & ~0xf;
		for (int x = x1; x <= x2; x += 16) {
			for (int z = z1; z <= z2; z += 16) {
				res.add(w.getChunkAt(x >> 4, z >> 4));
			}
		}
		return res;
	}

	public Iterator<Block> iterator() {
		return new CuboidIterator(this.getWorld(), this.x1, this.y1, this.z1, this.x2, this.y2, this.z2);
	}

	@Override
	public Cuboid clone() {
		return new Cuboid(this);
	}

	@Override
	public String toString() {
		return new String("Cuboid: " + this.worldName + "," + this.x1 + "," + this.y1 + "," + this.z1 + "=>" + this.x2 + "," + this.y2 + "," + this.z2);
	}

	public class CuboidIterator implements Iterator<Block> {
		private World w;
		private int baseX, baseY, baseZ;
		private int x, y, z;
		private int sizeX, sizeY, sizeZ;

		public CuboidIterator(World w, int x1, int y1, int z1, int x2, int y2, int z2) {
			this.w = w;
			this.baseX = x1;
			this.baseY = y1;
			this.baseZ = z1;
			this.sizeX = Math.abs(x2 - x1) + 1;
			this.sizeY = Math.abs(y2 - y1) + 1;
			this.sizeZ = Math.abs(z2 - z1) + 1;
			this.x = this.y = this.z = 0;
		}

		public boolean hasNext() {
			return this.x < this.sizeX && this.y < this.sizeY && this.z < this.sizeZ;
		}

		public Block next() {
			Block b = this.w.getBlockAt(this.baseX + this.x, this.baseY + this.y, this.baseZ + this.z);
			if (++x >= this.sizeX) {
				this.x = 0;
				if (++this.y >= this.sizeY) {
					this.y = 0;
					++this.z;
				}
			}
			return b;
		}

		public void remove() {
		}
	}

	public enum CuboidDirection {
		North, East, South, West, Up, Down, Horizontal, Vertical, Both, Unknown;

		public CuboidDirection opposite() {
			switch (this) {
			case North:
				return South;
			case East:
				return West;
			case South:
				return North;
			case West:
				return East;
			case Horizontal:
				return Vertical;
			case Vertical:
				return Horizontal;
			case Up:
				return Down;
			case Down:
				return Up;
			case Both:
				return Both;
			default:
				return Unknown;
			}
		}

	}

}