<?php
/**
 *  ____             __     __                    ____                       
 * /\  _`\          /\ \__ /\ \__                /\  _`\                     
 * \ \ \L\ \     __ \ \ ,_\\ \ ,_\     __   _ __ \ \ \L\_\     __     ___    
 *  \ \  _ <'  /'__`\\ \ \/ \ \ \/   /'__`\/\`'__\\ \ \L_L   /'__`\ /' _ `\  
 *   \ \ \L\ \/\  __/ \ \ \_ \ \ \_ /\  __/\ \ \/  \ \ \/, \/\  __/ /\ \/\ \ 
 *    \ \____/\ \____\ \ \__\ \ \__\\ \____\\ \_\   \ \____/\ \____\\ \_\ \_\
 *     \/___/  \/____/  \/__/  \/__/ \/____/ \/_/    \/___/  \/____/ \/_/\/_/
 * Tomorrow's pocketmine generator.
 * @author Ad5001
 * @link https://github.com/Ad5001/BetterGen
 */

namespace Ad5001\BetterGen\populator;

use Ad5001\BetterGen\structure\Well;
use pocketmine\block\Block;
use pocketmine\level\ChunkManager;
use pocketmine\level\Level;
use pocketmine\utils\Random;

class WellPopulator extends AmountPopulator {
	/** @var ChunkManager */
	protected $level;
	
	/*
	 * Populate the chunk
	 * @param $level pocketmine\level\ChunkManager
	 * @param $chunkX int
	 * @param $chunkZ int
	 * @param $random pocketmine\utils\Random
	 */
	public function populate(ChunkManager $level, $chunkX, $chunkZ, Random $random) {
		$this->level = $level;
		if ($random->nextBoundedInt(1000 ) > 25)
			return; // ~1 chance / 1000 due to building limitations.
		$well = new Well ();
		$x = $random->nextRange($chunkX << 4, ($chunkX << 4) + 15);
		$z = $random->nextRange($chunkZ << 4, ($chunkZ << 4) + 15);
		$y = $this->getHighestWorkableBlock($x, $z ) - 1;
		if ($well->canPlaceObject($level, $x, $y, $z, $random ))
			$well->placeObject($level, $x, $y, $z, $random);
	}
	
	/*
	 * Gets the top block (y) on an x and z axes
	 * @param $x int
	 * @param $z int
	 */
	protected function getHighestWorkableBlock($x, $z) {
		for($y = Level::Y_MAX; $y > 0; -- $y) {
			$b = $this->level->getBlockIdAt($x, $y, $z);
			if ($b === Block::SAND) {
				break;
			}
		}
		
		return $y++;
	}
}