tobspr_shapez.io/src/js/game/components/storage.js

import { Component } from "../component";
import { types } from "../../savegame/serialization";
import { gItemRegistry } from "../../core/global_registries";
import { BaseItem } from "../base_item";
import { ColorItem } from "../items/color_item";
import { ShapeItem } from "../items/shape_item";

export class StorageComponent extends Component {
    static getId() {
        return "Storage";
    }

    static getSchema() {
        return {
            maximumStorage: types.uint,
            storedCount: types.uint,
            storedItem: types.nullable(types.obj(gItemRegistry)),
            overlayOpacity: types.ufloat,
        };
    }

    duplicateWithoutContents() {
        return new StorageComponent({ maximumStorage: this.maximumStorage });
    }

    /**
     * @param {object} param0
     * @param {number=} param0.maximumStorage How much this storage can hold
     */
    constructor({ maximumStorage = 1e20 }) {
        super();
        this.maximumStorage = maximumStorage;

        /**
         * Currently stored item
         * @type {BaseItem}
         */
        this.storedItem = null;

        /**
         * How many of this item we have stored
         */
        this.storedCount = 0;

        /**
         * We compute an opacity to make sure it doesn't flicker
         */
        this.overlayOpacity = 0;
    }

    /**
     * Returns whether this storage can accept the item
     * @param {BaseItem} item
     */
    canAcceptItem(item) {
        if (this.storedCount >= this.maximumStorage) {
            return false;
        }
        if (!this.storedItem || this.storedCount === 0) {
            return true;
        }

        if (item instanceof ColorItem) {
            return this.storedItem instanceof ColorItem && this.storedItem.color === item.color;
        }

        if (item instanceof ShapeItem) {
            return (
                this.storedItem instanceof ShapeItem &&
                this.storedItem.definition.getHash() === item.definition.getHash()
            );
        }

        return false;
    }

    /**
     * @param {BaseItem} item
     */
    takeItem(item) {
        this.storedItem = item;
        this.storedCount++;
    }
}