Arakne / Araknemu

 * This file is part of Araknemu.

 *

 * Araknemu 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.

 *

 * Araknemu is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2017-2019 Vincent Quatrevieux

 */

package fr.quatrevieux.araknemu.game.player.inventory.slot;

import fr.quatrevieux.araknemu.game.item.Item;

import fr.quatrevieux.araknemu.game.item.inventory.ItemEntry;

import fr.quatrevieux.araknemu.game.item.inventory.ItemStorage;

import fr.quatrevieux.araknemu.game.item.inventory.StackableItemStorage;

import fr.quatrevieux.araknemu.game.item.inventory.exception.InventoryException;

import fr.quatrevieux.araknemu.game.player.inventory.InventoryEntry;

import org.checkerframework.checker.index.qual.Positive;

import org.checkerframework.checker.nullness.qual.Nullable;

import org.checkerframework.common.value.qual.IntVal;

import org.checkerframework.dataflow.qual.Pure;

import java.util.Optional;

/**

 * Slot for default position

 *

 * This slot will handle item stacking

 */

public final class DefaultSlot implements InventorySlot {

    private final StackableItemStorage<InventoryEntry> storage;

    @SuppressWarnings("method.invocation") // id() is static

    public DefaultSlot(ItemStorage<InventoryEntry> storage) {

        this.storage = new StackableItemStorage<>(storage, id());

    }

    @Override

    public Optional<InventoryEntry> entry() {

        return Optional.empty();

    }

    @Override

    public void check(Item item, int quantity) {

        // Default slot can store all items

    }

    @Override

    public InventoryEntry set(InventoryEntry entry) throws InventoryException {

        return storage.find(entry.item())

            .map(last -> {

                storage.delete(entry);

                // Quantity = 0 should not occur

                if (entry.quantity() > 0) {

                    last.add(entry.quantity());

                }

                return last;

            })

            .orElseGet(() -> {

                // Indexing the entry after move

                // For ensure that new item will be stacked

                storage.indexing(entry);

                return entry;

            })

        ;

    }

    @Override

    public InventoryEntry set(Item item, @Positive int quantity) throws InventoryException {

        return storage.add(item, quantity, id());

    }

    @Override

    public void uncheckedSet(@Nullable InventoryEntry entry) {

        // Do not store a single item : do nothing

    }

}