import { LoadProgressInfo } from '../types';
import { Avatar } from './Avatar';
export declare class AvatarManager {
    private static _instance;
    private avatarDownloader;
    private avatarCache;
    /** 下载队列：FIFO 顺序 */
    private downloadQueue;
    /** 当前正在执行的任务 */
    private currentTask;
    /** 任务索引：快速查找 id 对应的任务 */
    private taskIndex;
    /**
     * Access via global singleton
     */
    static get shared(): AvatarManager;
    /**
     * Load avatar
     * @param id Avatar ID
     * @param onProgress Progress callback
     * @param useCompressedModel Use compressed model resource (~30% of original size, with minor quality degradation). Defaults to false.
     * @returns Promise<Avatar>
     */
    load(id: string, onProgress?: (progress: LoadProgressInfo) => void, useCompressedModel?: boolean): Promise<Avatar>;
    /**
     * Cancel a pending or running download task
     * @param id Avatar ID to cancel
     * @returns true if task was found and cancelled
     */
    cancelLoad(id: string): boolean;
    /**
     * Get cached avatar
     * @param id Avatar ID
     * @returns Avatar instance, or undefined if not in cache
     */
    retrieve(id: string): Avatar | undefined;
    /**
     * Clear cached avatar for specified ID
     * @param id Avatar ID
     */
    clear(id: string): void;
    /**
     * Clear all avatar cache and cancel all tasks
     */
    clearAll(): void;
}