/// <reference types="node" />
import { Crazyflie } from '.';
import { TOC, TOCItem } from './toc';
import { EventEmitter } from 'events';
export declare class TOCFetcher extends EventEmitter {
    private crazyflie;
    type: TOC_TYPES;
    fetched: boolean;
    port: number;
    toc: TOC;
    readonly cachePath: string;
    length: number;
    crc: number;
    maxPackets: number;
    maxOperations: number;
    /**
     * Fetches TOC from the Crazyflie. Specify port because both parameters and logging use the same system
     * (https://wiki.bitcraze.io/doc:crazyflie:crtp:log#table_of_content_access)
     * (https://wiki.bitcraze.io/doc:crazyflie:crtp:param#toc_access)
     */
    constructor(crazyflie: Crazyflie, type: TOC_TYPES);
    start(): Promise<TOC>;
    handleTOCInfo(data: Buffer): Promise<void>;
    /**
     * Loop through all TOC ids and see if we already have it. If not, retrieve it.
     */
    private fetchRemainingTOCItems();
    /**
     * Fetch TOC item from the Crazyflie
     * (https://wiki.bitcraze.io/doc:crazyflie:crtp:log#get_toc_item)
     */
    private fetchTOCItem(id);
    /**
     * Handle TOC item response
     * (https://wiki.bitcraze.io/doc:crazyflie:crtp:log#get_toc_item)
     */
    handleTOCItem(data: Buffer): Promise<void>;
    /**
     * Save a TOC to cache
     */
    cacheTOC(crc: number, items: TOCItem[]): Promise<void>;
    /**
     * Get TOC from cache according to cyclic redundancy check (checksum) value
     * Will return null if no crc in cache
     */
    getTOCFromCache(crc: number): Promise<TOC>;
    /**
     * Gets the complete TOC cache
     * Will return null if file doesn't exist or invalid JSON
     */
    getTOCCache(): Promise<TOCCache>;
    /**
     * Deletes cache
     */
    clearCache(): Promise<void>;
}
export declare const enum TOC_TYPES {
    PARAM = 0,
    LOG = 1,
}
export interface TOCCache {
    [crc: number]: TOCItem[];
}