/**
 * Inventory System
 *
 * Manages player inventory with support for:
 * - Adding/removing items
 * - Item stacking
 * - Capacity limits
 * - Item queries
 * - Event notifications
 */
import type { Item, EventHandler } from './types';
/**
 * Inventory system for managing items
 */
export declare class InventorySystem {
    private items;
    private capacity;
    private eventHandlers;
    constructor(capacity?: number);
    /**
     * Add an item to inventory
     */
    addItem(item: Item): boolean;
    /**
     * Remove an item from inventory
     */
    removeItem(itemId: string, quantity?: number): boolean;
    /**
     * Remove item by name
     */
    removeItemByName(name: string, quantity?: number): boolean;
    /**
     * Check if inventory has an item
     */
    hasItem(itemId: string): boolean;
    /**
     * Check if inventory has item by name
     */
    hasItemByName(name: string, quantity?: number): boolean;
    /**
     * Get an item by ID
     */
    getItem(itemId: string): Item | undefined;
    /**
     * Find item by name
     */
    findItemByName(name: string): Item | undefined;
    /**
     * Get all items
     */
    getItems(): Item[];
    /**
     * Get items by category
     */
    getItemsByCategory(category: string): Item[];
    /**
     * Get item count
     */
    getItemCount(): number;
    /**
     * Get total quantity of all items
     */
    getTotalQuantity(): number;
    /**
     * Stack an item (increase quantity)
     */
    private stackItem;
    /**
     * Check if inventory is full
     */
    isFull(): boolean;
    /**
     * Get remaining capacity
     */
    getRemainingCapacity(): number;
    /**
     * Clear all items
     */
    clear(): void;
    /**
     * Sort items by property
     */
    sortItems(property: keyof Item, ascending?: boolean): Item[];
    /**
     * Search items by query
     */
    searchItems(query: string): Item[];
    /**
     * Get inventory value (sum of all item values)
     */
    getTotalValue(): number;
    /**
     * Export inventory state
     */
    export(): Item[];
    /**
     * Import inventory state
     */
    import(items: Item[]): void;
    /**
     * Register event handler
     */
    on(eventType: string, handler: EventHandler): void;
    /**
     * Unregister event handler
     */
    off(eventType: string, handler: EventHandler): void;
    /**
     * Emit event
     */
    private emit;
}
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