BaseInventory.php

<?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\inventory;
 
use pocketmine\item\Item;
use pocketmine\item\VanillaItems;
use pocketmine\player\Player;
use pocketmine\utils\ObjectSet;
use pocketmine\utils\Utils;
use function array_slice;
use function count;
use function max;
use function min;
use function spl_object_id;
 
abstract class BaseInventory implements Inventory{
    protected int $maxStackSize = Inventory::MAX_STACK;
    protected array $viewers = [];
    protected ObjectSet $listeners;
 
    public function __construct(){
        $this->listeners = new ObjectSet();
    }
 
    public function getMaxStackSize() : int{
        return $this->maxStackSize;
    }
 
    public function setMaxStackSize(int $size) : void{
        $this->maxStackSize = $size;
    }
 
    abstract protected function internalSetItem(int $index, Item $item) : void;
 
    public function setItem(int $index, Item $item) : void{
        if($item->isNull()){
            $item = VanillaItems::AIR();
        }else{
            $item = clone $item;
        }
 
        $oldItem = $this->getItem($index);
 
        $this->internalSetItem($index, $item);
        $this->onSlotChange($index, $oldItem);
    }
 
    abstract protected function internalSetContents(array $items) : void;
 
    public function setContents(array $items) : void{
        Utils::validateArrayValueType($items, function(Item $item) : void{});
        if(count($items) > $this->getSize()){
            $items = array_slice($items, 0, $this->getSize(), true);
        }
 
        $oldContents = $this->getContents(true);
 
        $listeners = $this->listeners->toArray();
        $this->listeners->clear();
        $viewers = $this->viewers;
        $this->viewers = [];
 
        $this->internalSetContents($items);
 
        $this->listeners->add(...$listeners); //don't directly write, in case listeners were added while operation was in progress
        foreach($viewers as $id => $viewer){
            $this->viewers[$id] = $viewer;
        }
 
        $this->onContentChange($oldContents);
    }
 
    protected function getMatchingItemCount(int $slot, Item $test, bool $checkTags) : int{
        $item = $this->getItem($slot);
        return $item->equals($test, true, $checkTags) ? $item->getCount() : 0;
    }
 
    public function contains(Item $item) : bool{
        $count = max(1, $item->getCount());
        $checkTags = $item->hasNamedTag();
        for($i = 0, $size = $this->getSize(); $i < $size; $i++){
            $slotCount = $this->getMatchingItemCount($i, $item, $checkTags);
            if($slotCount > 0){
                $count -= $slotCount;
                if($count <= 0){
                    return true;
                }
            }
        }
 
        return false;
    }
 
    public function all(Item $item) : array{
        $slots = [];
        $checkTags = $item->hasNamedTag();
        for($i = 0, $size = $this->getSize(); $i < $size; $i++){
            if($this->getMatchingItemCount($i, $item, $checkTags) > 0){
                $slots[$i] = $this->getItem($i);
            }
        }
 
        return $slots;
    }
 
    public function first(Item $item, bool $exact = false) : int{
        $count = $exact ? $item->getCount() : max(1, $item->getCount());
        $checkTags = $exact || $item->hasNamedTag();
 
        for($i = 0, $size = $this->getSize(); $i < $size; $i++){
            $slotCount = $this->getMatchingItemCount($i, $item, $checkTags);
            if($slotCount > 0 && ($slotCount === $count || (!$exact && $slotCount > $count))){
                return $i;
            }
        }
 
        return -1;
    }
 
    public function firstEmpty() : int{
        for($i = 0, $size = $this->getSize(); $i < $size; $i++){
            if($this->isSlotEmpty($i)){
                return $i;
            }
        }
 
        return -1;
    }
 
    public function isSlotEmpty(int $index) : bool{
        return $this->getItem($index)->isNull();
    }
 
    public function canAddItem(Item $item) : bool{
        return $this->getAddableItemQuantity($item) === $item->getCount();
    }
 
    public function getAddableItemQuantity(Item $item) : int{
        $count = $item->getCount();
        $maxStackSize = min($this->getMaxStackSize(), $item->getMaxStackSize());
 
        for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
            if($this->isSlotEmpty($i)){
                $count -= $maxStackSize;
            }else{
                $slotCount = $this->getMatchingItemCount($i, $item, true);
                if($slotCount > 0 && ($diff = $maxStackSize - $slotCount) > 0){
                    $count -= $diff;
                }
            }
 
            if($count <= 0){
                return $item->getCount();
            }
        }
 
        return $item->getCount() - $count;
    }
 
    public function addItem(Item ...$slots) : array{
        $itemSlots = [];
        foreach($slots as $slot){
            if(!$slot->isNull()){
                $itemSlots[] = clone $slot;
            }
        }
 
        $returnSlots = [];
 
        foreach($itemSlots as $item){
            $leftover = $this->internalAddItem($item);
            if(!$leftover->isNull()){
                $returnSlots[] = $leftover;
            }
        }
 
        return $returnSlots;
    }
 
    private function internalAddItem(Item $newItem) : Item{
        $emptySlots = [];
 
        $maxStackSize = min($this->getMaxStackSize(), $newItem->getMaxStackSize());
 
        for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
            if($this->isSlotEmpty($i)){
                $emptySlots[] = $i;
                continue;
            }
            $slotCount = $this->getMatchingItemCount($i, $newItem, true);
            if($slotCount === 0){
                continue;
            }
 
            if($slotCount < $maxStackSize){
                $amount = min($maxStackSize - $slotCount, $newItem->getCount());
                if($amount > 0){
                    $newItem->setCount($newItem->getCount() - $amount);
                    $slotItem = $this->getItem($i);
                    $slotItem->setCount($slotItem->getCount() + $amount);
                    $this->setItem($i, $slotItem);
                    if($newItem->getCount() <= 0){
                        break;
                    }
                }
            }
        }
 
        if(count($emptySlots) > 0){
            foreach($emptySlots as $slotIndex){
                $amount = min($maxStackSize, $newItem->getCount());
                $newItem->setCount($newItem->getCount() - $amount);
                $slotItem = clone $newItem;
                $slotItem->setCount($amount);
                $this->setItem($slotIndex, $slotItem);
                if($newItem->getCount() <= 0){
                    break;
                }
            }
        }
 
        return $newItem;
    }
 
    public function remove(Item $item) : void{
        $checkTags = $item->hasNamedTag();
 
        for($i = 0, $size = $this->getSize(); $i < $size; $i++){
            if($this->getMatchingItemCount($i, $item, $checkTags) > 0){
                $this->clear($i);
            }
        }
    }
 
    public function removeItem(Item ...$slots) : array{
        $searchItems = [];
        foreach($slots as $slot){
            if(!$slot->isNull()){
                $searchItems[] = clone $slot;
            }
        }
 
        for($i = 0, $size = $this->getSize(); $i < $size; ++$i){
            if($this->isSlotEmpty($i)){
                continue;
            }
 
            foreach($searchItems as $index => $search){
                $slotCount = $this->getMatchingItemCount($i, $search, $search->hasNamedTag());
                if($slotCount > 0){
                    $amount = min($slotCount, $search->getCount());
                    $search->setCount($search->getCount() - $amount);
 
                    $slotItem = $this->getItem($i);
                    $slotItem->setCount($slotItem->getCount() - $amount);
                    $this->setItem($i, $slotItem);
                    if($search->getCount() <= 0){
                        unset($searchItems[$index]);
                    }
                }
            }
 
            if(count($searchItems) === 0){
                break;
            }
        }
 
        return $searchItems;
    }
 
    public function clear(int $index) : void{
        $this->setItem($index, VanillaItems::AIR());
    }
 
    public function clearAll() : void{
        $this->setContents([]);
    }
 
    public function swap(int $slot1, int $slot2) : void{
        $i1 = $this->getItem($slot1);
        $i2 = $this->getItem($slot2);
        $this->setItem($slot1, $i2);
        $this->setItem($slot2, $i1);
    }
 
    public function getViewers() : array{
        return $this->viewers;
    }
 
    public function removeAllViewers() : void{
        foreach($this->viewers as $hash => $viewer){
            if($viewer->getCurrentWindow() === $this){ //this might not be the case for the player's own inventory
                $viewer->removeCurrentWindow();
            }
            unset($this->viewers[$hash]);
        }
    }
 
    public function onOpen(Player $who) : void{
        $this->viewers[spl_object_id($who)] = $who;
    }
 
    public function onClose(Player $who) : void{
        unset($this->viewers[spl_object_id($who)]);
    }
 
    protected function onSlotChange(int $index, Item $before) : void{
        foreach($this->listeners as $listener){
            $listener->onSlotChange($this, $index, $before);
        }
        foreach($this->viewers as $viewer){
            $invManager = $viewer->getNetworkSession()->getInvManager();
            if($invManager === null){
                continue;
            }
            $invManager->onSlotChange($this, $index);
        }
    }
 
    protected function onContentChange(array $itemsBefore) : void{
        foreach($this->listeners as $listener){
            $listener->onContentChange($this, $itemsBefore);
        }
 
        foreach($this->getViewers() as $viewer){
            $invManager = $viewer->getNetworkSession()->getInvManager();
            if($invManager === null){
                continue;
            }
            $invManager->syncContents($this);
        }
    }
 
    public function slotExists(int $slot) : bool{
        return $slot >= 0 && $slot < $this->getSize();
    }
 
    public function getListeners() : ObjectSet{
        return $this->listeners;
    }
}