<?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/
 *
 *
*/

/**
 * Network-related classes
 */
namespace pocketmine\network;

use pocketmine\event\player\PlayerCreationEvent;
use pocketmine\network\protocol\AddEntityPacket;
use pocketmine\network\protocol\AddItemEntityPacket;
use pocketmine\network\protocol\AddMobPacket;
use pocketmine\network\protocol\AddPaintingPacket;
use pocketmine\network\protocol\AddPlayerPacket;
use pocketmine\network\protocol\AdventureSettingsPacket;
use pocketmine\network\protocol\AnimatePacket;
use pocketmine\network\protocol\ChatPacket;
use pocketmine\network\protocol\ContainerClosePacket;
use pocketmine\network\protocol\ContainerOpenPacket;
use pocketmine\network\protocol\ContainerSetContentPacket;
use pocketmine\network\protocol\ContainerSetDataPacket;
use pocketmine\network\protocol\ContainerSetSlotPacket;
use pocketmine\network\protocol\DataPacket;
use pocketmine\network\protocol\DropItemPacket;
use pocketmine\network\protocol\EntityDataPacket;
use pocketmine\network\protocol\EntityEventPacket;
use pocketmine\network\protocol\ExplodePacket;
use pocketmine\network\protocol\HurtArmorPacket;
use pocketmine\network\protocol\Info as ProtocolInfo;
use pocketmine\network\protocol\InteractPacket;
use pocketmine\network\protocol\LevelEventPacket;
use pocketmine\network\protocol\DisconnectPacket;
use pocketmine\network\protocol\LoginPacket;
use pocketmine\network\protocol\LoginStatusPacket;
use pocketmine\network\protocol\MessagePacket;
use pocketmine\network\protocol\MoveEntityPacket;
use pocketmine\network\protocol\MovePlayerPacket;
use pocketmine\network\protocol\PlayerActionPacket;
use pocketmine\network\protocol\PlayerArmorEquipmentPacket;
use pocketmine\network\protocol\PlayerEquipmentPacket;
use pocketmine\network\protocol\RemoveBlockPacket;
use pocketmine\network\protocol\RemoveEntityPacket;
use pocketmine\network\protocol\RemovePlayerPacket;
use pocketmine\network\protocol\RespawnPacket;
use pocketmine\network\protocol\RotateHeadPacket;
use pocketmine\network\protocol\SendInventoryPacket;
use pocketmine\network\protocol\SetDifficultyPacket;
use pocketmine\network\protocol\SetEntityDataPacket;
use pocketmine\network\protocol\SetEntityMotionPacket;
use pocketmine\network\protocol\SetHealthPacket;
use pocketmine\network\protocol\SetSpawnPositionPacket;
use pocketmine\network\protocol\SetTimePacket;
use pocketmine\network\protocol\StartGamePacket;
use pocketmine\network\protocol\TakeItemEntityPacket;
use pocketmine\network\protocol\TileEventPacket;
use pocketmine\network\protocol\UnknownPacket;
use pocketmine\network\protocol\UpdateBlockPacket;
use pocketmine\network\protocol\UseItemPacket;
use pocketmine\Player;
use pocketmine\Server;
use pocketmine\utils\MainLogger;
use pocketmine\utils\TextFormat;
use raklib\protocol\EncapsulatedPacket;
use raklib\RakLib;
use raklib\server\RakLibServer;
use raklib\server\ServerHandler;
use raklib\server\ServerInstance;

class RakLibInterface implements ServerInstance, SourceInterface{

	/** @var \SplFixedArray */
	private $packetPool;

	/** @var Server */
	private $server;

	/** @var RakLibServer */
	private $rakLib;

	/** @var Player[] */
	private $players = [];

	/** @var \SplObjectStorage */
	private $identifiers;

	/** @var int[] */
	private $identifiersACK = [];

	/** @var ServerHandler */
	private $interface;

	private $upload = 0;
	private $download = 0;

	private $internalThreaded;
	private $externalThreaded;

	public function __construct(Server $server){

		$this->registerPackets();

		$this->server = $server;
		$this->identifiers = new \SplObjectStorage();

		$this->internalThreaded = new \Threaded();
		$this->externalThreaded = new \Threaded();

		$this->rakLib = new RakLibServer($this->internalThreaded, $this->externalThreaded, $this->server->getLogger(), $this->server->getLoader(), $this->server->getPort(), $this->server->getIp() === "" ? "0.0.0.0" : $this->server->getIp());
		$this->interface = new ServerHandler($this->rakLib, $this);
		$this->setName($this->server->getMotd());
	}

	public function doTick(){
		if(!$this->rakLib->isTerminated()){
			$this->interface->sendTick();
		}else{
			$info = $this->rakLib->getTerminationInfo();
			$this->server->removeInterface($this);
			\ExceptionHandler::handler(E_ERROR, "RakLib Thread crashed [".$info["scope"]."]: " . (isset($info["message"]) ? $info["message"] : ""), $info["file"], $info["line"]);
		}
	}

	public function process(){
		$work = false;
		if($this->interface->handlePacket()){
			$work = true;
			while($this->interface->handlePacket()){
			}
		}

		$this->doTick();

		return $work;
	}

	public function closeSession($identifier, $reason){
		if(isset($this->players[$identifier])){
			$player = $this->players[$identifier];
			$this->identifiers->detach($player);
			unset($this->players[$identifier]);
			unset($this->identifiersACK[$identifier]);
			$player->close(TextFormat::YELLOW . $player->getName() . " has left the game", $reason);
		}
	}

	public function close(Player $player, $reason = "unknown reason"){
		if(isset($this->identifiers[$player])){
			unset($this->players[$this->identifiers[$player]]);
			unset($this->identifiersACK[$this->identifiers[$player]]);
			$this->interface->closeSession($this->identifiers[$player], $reason);
			$this->identifiers->detach($player);
		}
	}

	public function shutdown(){
		$this->interface->shutdown();
	}

	public function emergencyShutdown(){
		$this->interface->emergencyShutdown();
	}

	public function openSession($identifier, $address, $port, $clientID){
		$ev = new PlayerCreationEvent($this, Player::class, Player::class, null, $address, $port);
		$this->server->getPluginManager()->callEvent($ev);
		$class = $ev->getPlayerClass();

		$player = new $class($this, $ev->getClientId(), $ev->getAddress(), $ev->getPort());
		$this->players[$identifier] = $player;
		$this->identifiersACK[$identifier] = 0;
		$this->identifiers->attach($player, $identifier);
		$this->server->addPlayer($identifier, $player);
	}

	public function handleEncapsulated($identifier, EncapsulatedPacket $packet, $flags){
		if(isset($this->players[$identifier])){
			try{
				$pk = $this->getPacket($packet->buffer);
				$pk->decode();
				$this->players[$identifier]->handleDataPacket($pk);
			}catch(\Exception $e){
				if(\pocketmine\DEBUG > 1){
					$logger = $this->server->getLogger();
					if($logger instanceof MainLogger){
						$logger->debug("Packet " . get_class($pk) . " 0x" . bin2hex($packet->buffer));
						$logger->logException($e);
					}
				}

				$this->interface->blockAddress($this->players[$identifier]->getAddress(), 5);
			}
		}
	}

	public function blockAddress($address, $timeout = 300){
		$this->interface->blockAddress($address, $timeout);
	}

	public function handleRaw($address, $port, $payload){
		$this->server->handlePacket($address, $port, $payload);
	}

	public function putRaw($address, $port, $payload){
		$this->interface->sendRaw($address, $port, $payload);
	}

	public function notifyACK($identifier, $identifierACK){
		if(isset($this->players[$identifier])){
			$this->players[$identifier]->handleACK($identifierACK);
		}
	}

	public function setName($name){
		$this->interface->sendOption("name", "MCCPP;Demo;$name");
	}

	public function setPortCheck($name){
		$this->interface->sendOption("portChecking", (bool) $name);
	}

	public function handleOption($name, $value){
		if($name === "bandwidth"){
			$v = unserialize($value);
			$this->upload = $v["up"];
			$this->download = $v["down"];
		}
	}

	public function getUploadUsage(){
		return $this->upload;
	}

	public function getDownloadUsage(){
		return $this->download;
	}

	public function putPacket(Player $player, DataPacket $packet, $needACK = false, $immediate = false){
		if(isset($this->identifiers[$player])){
			$identifier = $this->identifiers[$player];
			$pk = null;
			if(!$packet->isEncoded){
				$packet->encode();
			}elseif(!$needACK){
				if(!isset($packet->__encapsulatedPacket)){
					$packet->__encapsulatedPacket = new CachedEncapsulatedPacket;
					$packet->__encapsulatedPacket->identifierACK = null;
					$packet->__encapsulatedPacket->buffer = $packet->buffer;
					$packet->__encapsulatedPacket->reliability = 2;
				}
				$pk = $packet->__encapsulatedPacket;
			}

			if($pk === null){
				$pk = new EncapsulatedPacket();
				$pk->buffer = $packet->buffer;
				$pk->reliability = 2;
				if($needACK === true){
					$pk->identifierACK = $this->identifiersACK[$identifier]++;
				}
			}

			$this->interface->sendEncapsulated($identifier, $pk, ($needACK === true ? RakLib::FLAG_NEED_ACK : 0) | ($immediate === true ? RakLib::PRIORITY_IMMEDIATE : RakLib::PRIORITY_NORMAL));

			return $pk->identifierACK;
		}

		return null;
	}

	public function registerPacket($id, $class){
		$this->packetPool[$id] = $class;
	}

	/**
	 * @param $id
	 *
	 * @return DataPacket
	 */
	public function getPacketFromPool($id){
		/** @var DataPacket $class */
		$class = $this->packetPool[$id];
		if($class !== null){
			return new $class;
		}
		return null;
	}

	private function registerPackets(){
		$this->packetPool = new \SplFixedArray(256);

		$this->registerPacket(ProtocolInfo::DISCONNECT_PACKET, DisconnectPacket::class);
		$this->registerPacket(ProtocolInfo::LOGIN_PACKET, LoginPacket::class);
		$this->registerPacket(ProtocolInfo::LOGIN_STATUS_PACKET, LoginStatusPacket::class);
		$this->registerPacket(ProtocolInfo::MESSAGE_PACKET, MessagePacket::class);
		$this->registerPacket(ProtocolInfo::SET_TIME_PACKET, SetTimePacket::class);
		$this->registerPacket(ProtocolInfo::START_GAME_PACKET, StartGamePacket::class);
		$this->registerPacket(ProtocolInfo::ADD_MOB_PACKET, AddMobPacket::class);
		$this->registerPacket(ProtocolInfo::ADD_PLAYER_PACKET, AddPlayerPacket::class);
		$this->registerPacket(ProtocolInfo::REMOVE_PLAYER_PACKET, RemovePlayerPacket::class);
		$this->registerPacket(ProtocolInfo::ADD_ENTITY_PACKET, AddEntityPacket::class);
		$this->registerPacket(ProtocolInfo::REMOVE_ENTITY_PACKET, RemoveEntityPacket::class);
		$this->registerPacket(ProtocolInfo::ADD_ITEM_ENTITY_PACKET, AddItemEntityPacket::class);
		$this->registerPacket(ProtocolInfo::TAKE_ITEM_ENTITY_PACKET, TakeItemEntityPacket::class);
		$this->registerPacket(ProtocolInfo::MOVE_ENTITY_PACKET, MoveEntityPacket::class);
		$this->registerPacket(ProtocolInfo::ROTATE_HEAD_PACKET, RotateHeadPacket::class);
		$this->registerPacket(ProtocolInfo::MOVE_PLAYER_PACKET, MovePlayerPacket::class);
		$this->registerPacket(ProtocolInfo::REMOVE_BLOCK_PACKET, RemoveBlockPacket::class);
		$this->registerPacket(ProtocolInfo::UPDATE_BLOCK_PACKET, UpdateBlockPacket::class);
		$this->registerPacket(ProtocolInfo::ADD_PAINTING_PACKET, AddPaintingPacket::class);
		$this->registerPacket(ProtocolInfo::EXPLODE_PACKET, ExplodePacket::class);
		$this->registerPacket(ProtocolInfo::LEVEL_EVENT_PACKET, LevelEventPacket::class);
		$this->registerPacket(ProtocolInfo::TILE_EVENT_PACKET, TileEventPacket::class);
		$this->registerPacket(ProtocolInfo::ENTITY_EVENT_PACKET, EntityEventPacket::class);
		$this->registerPacket(ProtocolInfo::PLAYER_EQUIPMENT_PACKET, PlayerEquipmentPacket::class);
		$this->registerPacket(ProtocolInfo::PLAYER_ARMOR_EQUIPMENT_PACKET, PlayerArmorEquipmentPacket::class);
		$this->registerPacket(ProtocolInfo::INTERACT_PACKET, InteractPacket::class);
		$this->registerPacket(ProtocolInfo::USE_ITEM_PACKET, UseItemPacket::class);
		$this->registerPacket(ProtocolInfo::PLAYER_ACTION_PACKET, PlayerActionPacket::class);
		$this->registerPacket(ProtocolInfo::HURT_ARMOR_PACKET, HurtArmorPacket::class);
		$this->registerPacket(ProtocolInfo::SET_ENTITY_DATA_PACKET, SetEntityDataPacket::class);
		$this->registerPacket(ProtocolInfo::SET_ENTITY_MOTION_PACKET, SetEntityMotionPacket::class);
		$this->registerPacket(ProtocolInfo::SET_HEALTH_PACKET, SetHealthPacket::class);
		$this->registerPacket(ProtocolInfo::SET_SPAWN_POSITION_PACKET, SetSpawnPositionPacket::class);
		$this->registerPacket(ProtocolInfo::ANIMATE_PACKET, AnimatePacket::class);
		$this->registerPacket(ProtocolInfo::RESPAWN_PACKET, RespawnPacket::class);
		$this->registerPacket(ProtocolInfo::SEND_INVENTORY_PACKET, SendInventoryPacket::class);
		$this->registerPacket(ProtocolInfo::DROP_ITEM_PACKET, DropItemPacket::class);
		$this->registerPacket(ProtocolInfo::CONTAINER_OPEN_PACKET, ContainerOpenPacket::class);
		$this->registerPacket(ProtocolInfo::CONTAINER_CLOSE_PACKET, ContainerClosePacket::class);
		$this->registerPacket(ProtocolInfo::CONTAINER_SET_SLOT_PACKET, ContainerSetSlotPacket::class);
		$this->registerPacket(ProtocolInfo::CONTAINER_SET_DATA_PACKET, ContainerSetDataPacket::class);
		$this->registerPacket(ProtocolInfo::CONTAINER_SET_CONTENT_PACKET, ContainerSetContentPacket::class);
		$this->registerPacket(ProtocolInfo::CHAT_PACKET, ChatPacket::class);
		$this->registerPacket(ProtocolInfo::ADVENTURE_SETTINGS_PACKET, AdventureSettingsPacket::class);
		$this->registerPacket(ProtocolInfo::ENTITY_DATA_PACKET, EntityDataPacket::class);
		$this->registerPacket(ProtocolInfo::SET_DIFFICULTY_PACKET, SetDifficultyPacket::class);
	}

	private function getPacket($buffer){
		$pid = ord($buffer{0});

		if(($data = $this->getPacketFromPool($pid)) === null){
			$data = new UnknownPacket();
			$data->packetID = $pid;
		}
		$data->setBuffer(substr($buffer, 1));

		return $data;
	}
}