<?php
/**
 * Imported from BetterGen (https://github.com/Ad5001/BetterGen/blob/master/src/Ad5001/BetterGen/utils/BuildingUtils.php)
*/

namespace Ad5001\GenPainterPE\utils;

use pocketmine\block\Block;
use pocketmine\level\ChunkManager;
use pocketmine\math\Vector3;
use pocketmine\utils\Random;

class BuildingUtils {
	const TO_NOT_OVERWRITE = [ 
			Block::WATER,
			Block::STILL_WATER,
			Block::STILL_LAVA,
			Block::LAVA,
			Block::BEDROCK,
			Block::CACTUS,
			Block::PLANKS 
	];
	
	/**
	 * Fills an area
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @return void
	 */
	public static function fill(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block = null) {
		if ($block == null) $block = Block::get(Block::AIR);
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($x = $pos1->x; $x >= $pos2->x; $x --) for($y = $pos1->y; $y >= $pos2->y; $y --) for($z = $pos1->z; $z >= $pos2->z; $z --) {
					$level->setBlockIdAt($x, $y, $z, $block->getId ());
					$level->setBlockDataAt($x, $y, $z, $block->getDamage ());
				}
	}
	
	
	/**
	 * Fills an area randomly
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @param Random $random
	 * @param int $randMax
	 * @return void
	 */
	public static function fillRandom(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block = null, Random $random = null, $randMax = 3) {
		if ($block == null) $block = Block::get(Block::AIR);
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($x = $pos1->x; $x >= $pos2->x; $x --) for($y = $pos1->y; $y >= $pos2->y; $y --) for($z = $pos1->z; $z >= $pos2->z; $z --) if($random !== null ? $random->nextBoundedInt($randMax) == 0 : rand(0, $randMax) == 0) {
					$level->setBlockIdAt($x, $y, $z, $block->getId ());
					$level->setBlockDataAt($x, $y, $z, $block->getDamage ());
				}
	}
	
	/**
	 * Custom area filling
	 *
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param callable $call
	 * @param array $params
	 * @return array
	 */
	public static function fillCallback(Vector3 $pos1, Vector3 $pos2, callable $call, ...$params) : array {
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		$return = [];
		for($x = $pos1->x; $x >= $pos2->x; $x --) for($y = $pos1->y; $y >= $pos2->y; $y --) for($z = $pos1->z; $z >= $pos2->z; $z --) {
					$return[] = call_user_func($call, new Vector3($x, $y, $z), ...$params);
				}
		return $return;
	}
	
	/**
	 * Creates walls
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @return void
	 */
	public static function walls(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block) {
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($y = $pos1->y; $y >= $pos2->y; $y --) {
			for($x = $pos1->x; $x >= $pos2->x; $x --) {
				$level->setBlockIdAt($x, $y, $pos1->z, $block->getId ());
				$level->setBlockDataAt($x, $y, $pos1->z, $block->getDamage ());
				$level->setBlockIdAt($x, $y, $pos2->z, $block->getId ());
				$level->setBlockDataAt($x, $y, $pos2->z, $block->getDamage ());
			}
			for($z = $pos1->z; $z >= $pos2->z; $z --) {
				$level->setBlockIdAt($pos1->x, $y, $z, $block->getId ());
				$level->setBlockDataAt($pos1->x, $y, $z, $block->getDamage ());
				$level->setBlockIdAt($pos2->x, $y, $z, $block->getId ());
				$level->setBlockDataAt($pos2->x, $y, $z, $block->getDamage ());
			}
		}
	}
	
	/**
	 * Creates the top of a structure
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @return void
	 */
	public static function top(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block) {
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($x = $pos1->x; $x >= $pos2->x; $x --)
			for($z = $pos1->z; $z >= $pos2->z; $z --) {
				$level->setBlockIdAt($x, $pos1->y, $z, $block->getId ());
				$level->setBlockDataAt($x, $pos1->y, $z, $block->getDamage ());
			}
	}
	
	/**
	 * Creates the corners of the structures. Used for mineshaft "towers"
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @return void
	 */
	public static function corners(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block) {
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($y = $pos1->y; $y >= $pos2->y; $y --) {
			$level->setBlockIdAt($pos1->x, $y, $pos1->z, $block->getId ());
			$level->setBlockDataAt($pos1->x, $y, $pos1->z, $block->getDamage ());
			$level->setBlockIdAt($pos2->x, $y, $pos1->z, $block->getId ());
			$level->setBlockDataAt($pos2->x, $y, $pos1->z, $block->getDamage ());
			$level->setBlockIdAt($pos1->x, $y, $pos2->z, $block->getId ());
			$level->setBlockDataAt($pos1->x, $y, $pos2->z, $block->getDamage ());
			$level->setBlockIdAt($pos2->x, $y, $pos2->z, $block->getId ());
			$level->setBlockDataAt($pos2->x, $y, $pos2->z, $block->getDamage ());
		}
	}
	
	/**
	 * Fills the bottom of a structure
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @param Block $block
	 * @return void
	 */
	public static function bottom(ChunkManager $level, Vector3 $pos1, Vector3 $pos2, Block $block) {
		list($pos1, $pos2) = self::minmax($pos1, $pos2);
		for($x = $pos1->x; $x >= $pos2->x; $x --)
			for($z = $pos1->z; $z >= $pos2->z; $z --) {
				$level->setBlockIdAt($x, $pos2->y, $z, $block->getId ());
				$level->setBlockDataAt($x, $pos2->y, $z, $block->getDamage ());
			}
	}
	
	/**
	 * Builds a structure randomly based on a circle algorithm. Used in caves and lakes.
	 *
	 * @param ChunkManager $level
	 * @param Vector3 $pos
	 * @param Vector3 $infos
	 * @param Random $random
	 * @param Block $block
	 * @return void
	 */
	public static function buildRandom(ChunkManager $level, Vector3 $pos, Vector3 $infos, Random $random, Block $block) {
		$xBounded = $random->nextBoundedInt(3) - 1;
		$yBounded = $random->nextBoundedInt(3) - 1;
		$zBounded = $random->nextBoundedInt(3) - 1;
		$pos = $pos->round ();
		for($x = $pos->x - ($infos->x / 2); $x <= $pos->x + ($infos->x / 2); $x ++) {
			for($y = $pos->y - ($infos->y / 2); $y <= $pos->y + ($infos->y / 2); $y ++) {
				for($z = $pos->z - ($infos->z / 2); $z <= $pos->z + ($infos->z / 2); $z ++) {
					// if(abs((abs($x) - abs($pos->x)) ** 2 + ($y - $pos->y) ** 2 + (abs($z) - abs($pos->z)) ** 2) < (abs($infos->x / 2 + $xBounded) + abs($infos->y / 2 + $yBounded) + abs($infos->z / 2 + $zBounded)) ** 2
					if (abs((abs($x) - abs($pos->x)) ** 2 + ($y - $pos->y) ** 2 + (abs($z) - abs($pos->z)) ** 2) < ((($infos->x / 2 - $xBounded) + ($infos->y / 2 - $yBounded) + ($infos->z / 2 - $zBounded)) / 3) ** 2 && $y > 0 && ! in_array($level->getBlockIdAt($x, $y, $z), self::TO_NOT_OVERWRITE) && ! in_array($level->getBlockIdAt($x, $y + 1, $z), self::TO_NOT_OVERWRITE)) {
						$level->setBlockIdAt($x, $y, $z, $block->getId ());
						$level->setBlockDataAt($x, $y, $z, $block->getDamage ());
					}
				}
			}
		}
	}
	
	/**
	 * Returns two Vector three, the biggest and lowest ones based on two provided vectors
	 *
	 * @param Vector3 $pos1
	 * @param Vector3 $pos2
	 * @return array
	 */
	protected static function minmax(Vector3 $pos1, Vector3 $pos2): array {
		$v1 = new Vector3(max($pos1->x, $pos2->x), max($pos1->y, $pos2->y), max($pos1->z, $pos2->z));
		$v2 = new Vector3(min($pos1->x, $pos2->x), min($pos1->y, $pos2->y), min($pos1->z, $pos2->z));
		return [ 
				$v1,
				$v2 
		];
	}
}