<?php

/***REM_START***/
require_once("LevelGenerator.php");

/***REM_END***/
class SuperflatGenerator implements LevelGenerator{

	private $level, $random, $structure, $chunks, $options, $floorLevel, $populators = [];

	public function __construct(array $options = []){
		$this->preset = "2;7,59x1,3x3,2;1;spawn(radius=10 block=89),decoration(treecount=80 grasscount=45)";
		$this->options = $options;
		if(isset($options["preset"])){
			$this->parsePreset($options["preset"]);
		}else{
			$this->parsePreset($this->preset);
		}
		if(isset($this->options["decoration"])){
			$ores = new OrePopulator();
			$ores->setOreTypes([
				new OreType(new CoalOreBlock(), 20, 16, 0, 128),
				new OreType(new IronOreBlock(), 20, 8, 0, 64),
				new OreType(new RedstoneOreBlock(), 8, 7, 0, 16),
				new OreType(new LapisOreBlock(), 1, 6, 0, 32),
				new OreType(new GoldOreBlock(), 2, 8, 0, 32),
				new OreType(new DiamondOreBlock(), 1, 7, 0, 16),
				new OreType(new DirtBlock(), 20, 32, 0, 128),
				new OreType(new GravelBlock(), 10, 16, 0, 128),
			]);
			$this->populators[] = $ores;
		}

		/*if(isset($this->options["mineshaft"])){
			$this->populators[] = new MineshaftPopulator(isset($this->options["mineshaft"]["chance"]) ? floatval($this->options["mineshaft"]["chance"]) : 0.01);
		}*/
	}
	
	public function parsePreset($preset){
		$this->preset = $preset;
		$preset = explode(";", $preset);
		$version = (int) $preset[0];
		$blocks = @$preset[1];
		$biome = $preset[2] ?? 1;
		$options = $preset[3] ?? "";
		preg_match_all('#(([0-9]{0,})x?([0-9]{1,3}:?[0-9]{0,2})),?#', $blocks, $matches);
		$y = 0;
		$this->structure = [];
		$this->chunks = [];
		foreach($matches[3] as $i => $b){
			$b = BlockAPI::fromString($b);
			$cnt = $matches[2][$i] === "" ? 1 : intval($matches[2][$i]);
			for($cY = $y, $y += $cnt; $cY < $y; ++$cY){
				$this->structure[$cY] = $b;
			}
		}

		$this->floorLevel = $y;

		for(; $y < 0xFF; ++$y){
			$this->structure[$y] = new AirBlock();
		}


		for($Y = 0; $Y < 8; ++$Y){
			$this->chunks[$Y] = "";
			$startY = $Y << 4;
			$endY = $startY + 16;
			for($Z = 0; $Z < 16; ++$Z){
				for($X = 0; $X < 16; ++$X){
					$blocks = "";
					$metas = "";
					for($y = $startY; $y < $endY; ++$y){
						$blocks .= chr($this->structure[$y]->getID());
						$metas .= substr(dechex($this->structure[$y]->getMetadata()), -1);
					}
					$this->chunks[$Y] .= $blocks . hex2bin($metas) . "\x00\x00\x00\x00\x00\x00\x00\x00";
				}
			}
		}

		preg_match_all('#(([0-9a-z_]{1,})\(?([0-9a-z_ =:]{0,})\)?),?#', $options, $matches);
		foreach($matches[2] as $i => $option){
			$params = true;
			if($matches[3][$i] !== ""){
				$params = [];
				$p = explode(" ", $matches[3][$i]);
				foreach($p as $k){
					$k = explode("=", $k);
					if(isset($k[1])){
						$params[$k[0]] = $k[1];
					}
				}
			}
			$this->options[$option] = $params;
		}
	}

	public function init(Level $level, Random $random){
		$this->level = $level;
		$this->random = $random;
	}

	public function generateChunk($chunkX, $chunkZ){
		for($Y = 0; $Y < 8; ++$Y){
			$this->level->setMiniChunk($chunkX, $chunkZ, $Y, $this->chunks[$Y]);
		}
	}

	public function populateChunk($chunkX, $chunkZ){
		foreach($this->populators as $populator){
			$this->random->setSeed((int) ($chunkX * 0xdead + $chunkZ * 0xbeef) ^ $this->level->getSeed());
			$populator->populate($this->level, $chunkX, $chunkZ, $this->random);
		}
	}

	public function populateLevel(){
		$this->random->setSeed($this->level->getSeed());
		if(isset($this->options["spawn"])){
			$spawn = [10, new SandstoneBlock()];
			if(isset($this->options["spawn"]["radius"])){
				$spawn[0] = intval($this->options["spawn"]["radius"]);
			}
			if(isset($this->options["spawn"]["block"])){
				$spawn[1] = BlockAPI::fromString($this->options["spawn"]["block"])->getBlock();
				if(!($spawn[1] instanceof Block)){
					$spawn[1] = new SandstoneBlock();
				}
			}

			$start = 128 - $spawn[0];
			$end = 128 + $spawn[0];
			for($x = $start; $x <= $end; ++$x){
				for($z = $start; $z <= $end; ++$z){
					if(floor(sqrt(($x - 128)*($x - 128)+ ($z - 128)*($z - 128))) <= $spawn[0]){
						$this->level->setBlockRaw(new Vector3($x, $this->floorLevel - 1, $z), $spawn[1], null);
					}
				}
			}
		}

		if(isset($this->options["decoration"])){
			$treecount = 80;
			$grasscount = 120;
			if(isset($this->options["spawn"]["treecount"])){
				$treecount = intval($this->options["spawn"]["treecount"]);
			}
			if(isset($this->options["spawn"]["grasscount"])){
				$grasscount = intval($this->options["spawn"]["grasscount"]);
			}
			for($t = 0; $t < $treecount; ++$t){
				$centerX = $this->random->nextRange(0, 255);
				$centerZ = $this->random->nextRange(0, 255);
				$down = $this->level->level->getBlockID($centerX, $this->floorLevel - 1, $centerZ);
				if($down === DIRT or $down === GRASS or $down === FARMLAND){
					TreeObject::growTree($this->level, new Vector3($centerX, $this->floorLevel, $centerZ), $this->random, $this->random->nextRange(0, 3));
				}
			}
			for($t = 0; $t < $grasscount; ++$t){
				$centerX = $this->random->nextRange(0, 255);
				$centerZ = $this->random->nextRange(0, 255);
				$down = $this->level->level->getBlockID($centerX, $this->floorLevel - 1, $centerZ);
				if($down === GRASS){
					TallGrassObject::growGrass($this->level, new Vector3($centerX, $this->floorLevel - 1, $centerZ), $this->random, $this->random->nextRange(8, 40));
				}
			}
		}
	}

	public function getSpawn(){
		return new Vector3(128, $this->floorLevel, 128);
	}
}