<?php

/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
*/

declare(strict_types=1);

namespace pocketmine\level\generator;

use pocketmine\block\CoalOre;
use pocketmine\block\DiamondOre;
use pocketmine\block\Dirt;
use pocketmine\block\GoldOre;
use pocketmine\block\Gravel;
use pocketmine\block\IronOre;
use pocketmine\block\LapisOre;
use pocketmine\block\RedstoneOre;
use pocketmine\item\Item;
use pocketmine\level\ChunkManager;
use pocketmine\level\format\Chunk;
use pocketmine\level\generator\populator\Ore;
use pocketmine\level\generator\populator\Populator;
use pocketmine\math\Vector3;
use pocketmine\utils\Random;

class Flat extends Generator{
	/** @var ChunkManager */
	private $level;
	/** @var Chunk */
	private $chunk;
	/** @var Random */
	private $random;
	/** @var Populator[] */
	private $populators = [];
	private $structure, $chunks, $options, $floorLevel, $preset;

	public function getSettings(){
		return $this->options;
	}

	public function getName(){
		return "flat";
	}

	public function __construct(array $options = []){
		$this->preset = "2;7,2x3,2;1;";
		//$this->preset = "2;7,59x1,3x3,2;1;spawn(radius=10 block=89),decoration(treecount=80 grasscount=45)";
		$this->options = $options;
		$this->chunk = null;

		if(isset($this->options["decoration"])){
			$ores = new Ore();
			$ores->setOreTypes([
				new object\OreType(new CoalOre(), 20, 16, 0, 128),
				new object\OreType(new IronOre(), 20, 8, 0, 64),
				new object\OreType(new RedstoneOre(), 8, 7, 0, 16),
				new object\OreType(new LapisOre(), 1, 6, 0, 32),
				new object\OreType(new GoldOre(), 2, 8, 0, 32),
				new object\OreType(new DiamondOre(), 1, 7, 0, 16),
				new object\OreType(new Dirt(), 20, 32, 0, 128),
				new object\OreType(new Gravel(), 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 static function parseLayers(string $layers) : array{
		$result = [];
		preg_match_all('#^(([0-9]*x|)([0-9]{1,3})(|:[0-9]{0,2}))$#m', str_replace(",", "\n", $layers), $matches);
		$y = 0;
		foreach($matches[3] as $i => $b){
			$b = Item::fromString($b . $matches[4][$i]);
			$cnt = $matches[2][$i] === "" ? 1 : intval($matches[2][$i]);
			for($cY = $y, $y += $cnt; $cY < $y; ++$cY){
				$result[$cY] = [$b->getId(), $b->getDamage()];
			}
		}

		return $result;
	}

	protected function parsePreset($preset, $chunkX, $chunkZ){
		$this->preset = $preset;
		$preset = explode(";", $preset);
		$version = (int) $preset[0];
		$blocks = (string) ($preset[1] ?? "");
		$biome = (int) ($preset[2] ?? 1);
		$options = (string) ($preset[3] ?? "");
		$this->structure = self::parseLayers($blocks);

		$this->chunks = [];

		$this->floorLevel = $y = count($this->structure);

		$this->chunk = clone $this->level->getChunk($chunkX, $chunkZ);
		$this->chunk->setGenerated();

		for($Z = 0; $Z < 16; ++$Z){
			for($X = 0; $X < 16; ++$X){
				$this->chunk->setBiomeId($X, $Z, $biome);
				for($y = 0; $y < 256 and isset($this->structure[$y]); ++$y){
					$this->chunk->setBlock($X, $y, $Z, ...$this->structure[$y]);
				}
			}
		}

		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(ChunkManager $level, Random $random){
		$this->level = $level;
		$this->random = $random;

		/*
		  // Commented out : We want to delay this
		if(isset($this->options["preset"]) and $this->options["preset"] != ""){
			$this->parsePreset($this->options["preset"]);
		}else{
			$this->parsePreset($this->preset);
		}
		*/
	}

	public function generateChunk($chunkX, $chunkZ){
		if($this->chunk === null){
			if(isset($this->options["preset"]) and $this->options["preset"] != ""){
				$this->parsePreset($this->options["preset"], $chunkX, $chunkZ);
			}else{
				$this->parsePreset($this->preset, $chunkX, $chunkZ);
			}
		}
		$chunk = clone $this->chunk;
		$chunk->setX($chunkX);
		$chunk->setZ($chunkZ);
		$this->level->setChunk($chunkX, $chunkZ, $chunk);
	}

	public function populateChunk($chunkX, $chunkZ){
		$this->random->setSeed(0xdeadbeef ^ ($chunkX << 8) ^ $chunkZ ^ $this->level->getSeed());
		foreach($this->populators as $populator){
			$populator->populate($this->level, $chunkX, $chunkZ, $this->random);
		}

	}

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