<?php

class Vector3{

	public $x, $y, $z;

	public function __construct($x = 0, $y = 0, $z = 0){
		$this->x = $x;
		$this->y = $y;
		$this->z = $z;
	}
	
	public function setXYZ($x, $y, $z){
		$this->x = $x;
		$this->y = $y;
		$this->z = $z;
	}
	
	public function copy(){
		return new Vector3($this->x, $this->y, $this->z);
	}
	
	public function toArray(){
		return ["x" => $this->x, "y" => $this->y, "z" => $this->z];
	}
	
	public function getFloorX(){
		return (int) $this->x;
	}

	public function getFloorY(){
		return (int) $this->y;
	}

	public function getFloorZ(){
		return (int) $this->z;
	}

	public function getRight(){
		return $this->getX();
	}

	public function getX(){
		return $this->x;
	}

	public function getUp(){
		return $this->getY();
	}

	public function getY(){
		return $this->y;
	}

	public function getForward(){
		return $this->getZ();
	}

	public function getZ(){
		return $this->z;
	}

	public function getSouth(){
		return $this->getX();
	}

	public function getWest(){
		return $this->getZ();
	}

	public function subtract($x = 0, $y = 0, $z = 0){
		if(($x instanceof Vector3) === true){
			return $this->subtract($x->x, $x->y, $x->z);
		}else{
			return new Vector3($this->x - $x, $this->y - $y, $this->z - $z);
		}
	}

	public function add($x = 0, $y = 0, $z = 0){
		if(($x instanceof Vector3) === true){
			return $this->add($x->x, $x->y, $x->z);
		}else{
			return new Vector3($this->x + $x, $this->y + $y, $this->z + $z);
		}
	}

	public function multiply($number){
		return new Vector3($this->x * $number, $this->y * $number, $this->z * $number);
	}

	public function ceil(){
		return new Vector3((int) ($this->x + 1), (int) ($this->y + 1), (int) ($this->z + 1));
	}

	public function floor(){
		return new Vector3((int) $this->x, (int) $this->y, (int) $this->z);
	}

	public function round(){
		return new Vector3(round($this->x), round($this->y), round($this->z));
	}

	public function abs(){
		return new Vector3(abs($this->x), abs($this->y), abs($this->z));
	}

	public function getSide($side, $step = 1){
		switch((int) $side){
			case 0:
				return new Vector3($this->x, $this->y - $step, $this->z);
			case 1:
				return new Vector3($this->x, $this->y + $step, $this->z);
			case 2:
				return new Vector3($this->x, $this->y, $this->z - $step);
			case 3:
				return new Vector3($this->x, $this->y, $this->z + $step);
			case 4:
				return new Vector3($this->x - $step, $this->y, $this->z);
			case 5:
				return new Vector3($this->x + $step, $this->y, $this->z);
			default:
				return $this;
		}
	}

	public function distance($x = 0, $y = 0, $z = 0){
		if(($x instanceof Vector3) === true){
			return sqrt($this->distanceSquared($x->x, $x->y, $x->z));
		}else{
			return sqrt($this->distanceSquared($x, $y, $z));
		}
	}

	public function distanceSquared($x = 0, $y = 0, $z = 0){
		if(($x instanceof Vector3) === true){
			return $this->distanceSquared($x->x, $x->y, $x->z);
		}else{
			return pow($this->x - $x, 2) + pow($this->y - $y, 2) + pow($this->z - $z, 2);
		}
	}

	public function maxPlainDistance($x = 0, $z = 0){
		if(($x instanceof Vector3) === true){
			return $this->maxPlainDistance($x->x, $x->z);
		}else{
			return max(abs($this->x - $x), abs($this->z - $z));
		}
	}

	public function normalize(){
		$len = $this->length();
		if($len != 0){
			return $this->divide($len);
		}
		return new Vector3(0, 0, 0);
	}

	public function length(){
		return sqrt($this->lengthSquared());
	}

	public function lengthSquared(){
		return $this->x * $this->x + $this->y * $this->y + $this->z * $this->z;
	}

	public function divide($number){
		return new Vector3($this->x / $number, $this->y / $number, $this->z / $number);
	}

	public function dot(Vector3 $v){
		return $this->x * $v->x + $this->y * $v->y + $this->z * $v->z;
	}

	public function cross(Vector3 $v){
		return new Vector3(
			$this->y * $v->z - $this->z * $v->y,
			$this->z * $v->x - $this->x * $v->z,
			$this->x * $v->y - $this->y * $v->x
		);
	}
	
	public static function fromArray($arr){
		return new Vector3($arr[0], $arr[1], $arr[2]);
	}
	
	public function __toString(){
		return "Vector3(x=" . $this->x . ",y=" . $this->y . ",z=" . $this->z . ")";
	}
	
	
	/**
	 * Returns a new vector with x value equal to the second parameter, along the line between this vector and the
	 * passed in vector, or null if not possible.
	 *
	 * @param Vector3 $v
	 * @param float   $x
	 *
	 * @return Vector3
	 */
	public function getIntermediateWithXValue(Vector3 $v, $x){
		$xDiff = $v->x - $this->x;
		$yDiff = $v->y - $this->y;
		$zDiff = $v->z - $this->z;
		
		if(($xDiff * $xDiff) < 0.0000001){
			return null;
		}
		
		$f = ($x - $this->x) / $xDiff;
		
		if($f < 0 or $f > 1){
			return null;
		}else{
			return new Vector3($this->x + $xDiff * $f, $this->y + $yDiff * $f, $this->z + $zDiff * $f);
		}
	}
	
	/**
	 * Returns a new vector with y value equal to the second parameter, along the line between this vector and the
	 * passed in vector, or null if not possible.
	 *
	 * @param Vector3 $v
	 * @param float   $y
	 *
	 * @return Vector3
	 */
	public function getIntermediateWithYValue(Vector3 $v, $y){
		$xDiff = $v->x - $this->x;
		$yDiff = $v->y - $this->y;
		$zDiff = $v->z - $this->z;
		
		if(($yDiff * $yDiff) < 0.0000001){
			return null;
		}
		
		$f = ($y - $this->y) / $yDiff;
		
		if($f < 0 or $f > 1){
			return null;
		}else{
			return new Vector3($this->x + $xDiff * $f, $this->y + $yDiff * $f, $this->z + $zDiff * $f);
		}
	}
	
	/**
	 * Returns a new vector with z value equal to the second parameter, along the line between this vector and the
	 * passed in vector, or null if not possible.
	 *
	 * @param Vector3 $v
	 * @param float   $z
	 *
	 * @return Vector3
	 */
	public function getIntermediateWithZValue(Vector3 $v, $z){
		$xDiff = $v->x - $this->x;
		$yDiff = $v->y - $this->y;
		$zDiff = $v->z - $this->z;
		
		if(($zDiff * $zDiff) < 0.0000001){
			return null;
		}
		
		$f = ($z - $this->z) / $zDiff;
		
		if($f < 0 or $f > 1){
			return null;
		}else{
			return new Vector3($this->x + $xDiff * $f, $this->y + $yDiff * $f, $this->z + $zDiff * $f);
		}
	}
}