Made rails less weird

Not up to the task of implementing rail connectivity today, some other time

src/pocketmine/block/Rail.php

@@ -23,8 +23,24 @@ declare(strict_types=1);
 
 namespace pocketmine\block;
 
+use pocketmine\item\Item;
+use pocketmine\level\Level;
+use pocketmine\math\Vector3;
+use pocketmine\Player;
+
 class Rail extends Flowable{
 
+	const STRAIGHT_NORTH_SOUTH = 0;
+	const STRAIGHT_EAST_WEST = 1;
+	const ASCENDING_EAST = 2;
+	const ASCENDING_WEST = 3;
+	const ASCENDING_NORTH = 4;
+	const ASCENDING_SOUTH = 5;
+	const CURVE_SOUTHEAST = 6;
+	const CURVE_SOUTHWEST = 7;
+	const CURVE_NORTHWEST = 8;
+	const CURVE_NORTHEAST = 9;
+
 	protected $id = self::RAIL;
 
 	public function __construct($meta = 0){
@@ -38,4 +54,25 @@ class Rail extends Flowable{
 	public function getHardness(){
 		return 0.7;
 	}
+
+	public function place(Item $item, Block $block, Block $target, $face, $fx, $fy, $fz, Player $player = null){
+		if(!$block->getSide(Vector3::SIDE_DOWN)->isTransparent()){
+			return $this->getLevel()->setBlock($block, $this, true, true);
+		}
+
+		return false;
+	}
+
+	public function onUpdate($type){
+		if($type === Level::BLOCK_UPDATE_NORMAL){
+			if($this->getSide(Vector3::SIDE_DOWN)->isTransparent()){
+				$this->getLevel()->useBreakOn($this);
+				return $type;
+			}else{
+				//TODO: Update rail connectivity
+			}
+		}
+
+		return false;
+	}
 }