import { IEventBus } from '../types/CalendarTypes';
import { OperationQueue } from '../storage/OperationQueue';
import { IndexedDBService } from '../storage/IndexedDBService';
import { ApiEventRepository } from '../repositories/ApiEventRepository';
/**
 * SyncManager - Background sync worker
 * Processes operation queue and syncs with API when online
 *
 * Features:
 * - Monitors online/offline status
 * - Processes queue with FIFO order
 * - Exponential backoff retry logic
 * - Updates syncStatus in IndexedDB after successful sync
 * - Emits sync events for UI feedback
 */
export declare class SyncManager {
    private eventBus;
    private queue;
    private indexedDB;
    private apiRepository;
    private isOnline;
    private isSyncing;
    private syncInterval;
    private maxRetries;
    private intervalId;
    constructor(eventBus: IEventBus, queue: OperationQueue, indexedDB: IndexedDBService, apiRepository: ApiEventRepository);
    /**
     * Setup online/offline event listeners
     */
    private setupNetworkListeners;
    /**
     * Start background sync worker
     */
    startSync(): void;
    /**
     * Stop background sync worker
     */
    stopSync(): void;
    /**
     * Process operation queue
     * Sends pending operations to API
     */
    private processQueue;
    /**
     * Process a single operation
     */
    private processOperation;
    /**
     * Mark event as synced in IndexedDB
     */
    private markEventAsSynced;
    /**
     * Mark event as error in IndexedDB
     */
    private markEventAsError;
    /**
     * Calculate exponential backoff delay
     * @param retryCount Current retry count
     * @returns Delay in milliseconds
     */
    private calculateBackoff;
    /**
     * Manually trigger sync (for testing or manual sync button)
     */
    triggerManualSync(): Promise<void>;
    /**
     * Get current sync status
     */
    getSyncStatus(): {
        isOnline: boolean;
        isSyncing: boolean;
        isRunning: boolean;
    };
    /**
     * Cleanup - stop sync and remove listeners
     */
    destroy(): void;
}