/**
 * OTA Manager - Handles firmware over-the-air updates via BLE
 *
 * Downloads firmware from backend, transfers to device via BLE,
 * device writes to SD card as update.ufw and reboots to apply.
 */
import EventEmitter from 'eventemitter3';
import type { ConnectedDevice } from '../models/Device';
import type { DeviceManager } from './DeviceManager';
/**
 * Firmware info
 */
export interface FirmwareInfo {
    version: string;
    url: string;
    checksum: string;
    releaseNotes?: string;
    size: number;
}
/**
 * OTA progress stages
 */
export type OtaStage = 'checking' | 'downloading' | 'preparing' | 'updating' | 'verifying' | 'restarting' | 'completed' | 'failed';
/**
 * OTA progress
 */
export interface OtaProgress {
    stage: OtaStage;
    progress: number;
    error?: string;
}
/**
 * Events emitted by OTAManager
 */
interface OTAManagerEvents {
    updateAvailable: (firmware: FirmwareInfo) => void;
    progress: (deviceId: string, progress: OtaProgress) => void;
    completed: (deviceId: string, version: string) => void;
    failed: (deviceId: string, error: Error) => void;
}
/**
 * OTA Manager class
 */
export declare class OTAManager extends EventEmitter<OTAManagerEvents> {
    private firmwareCdnUrl;
    private deviceManager;
    constructor(deviceManager: DeviceManager, firmwareCdnUrl?: string);
    /**
     * Check for available firmware updates
     */
    checkForUpdate(device: ConnectedDevice): Promise<FirmwareInfo | null>;
    /**
     * Download firmware package
     */
    downloadFirmware(firmware: FirmwareInfo): Promise<ArrayBuffer>;
    /**
     * Perform firmware update via Bluetooth transfer to SD card.
     *
     * Downloads firmware from URL, transfers to device via BLE,
     * device writes to SD card as update.ufw and reboots to apply.
     *
     * @param grantBlob - P7: Base64-encoded 207-byte OTA grant blob. When provided,
     *                    written to CHAR_DEVICE_COMMAND before upload begins so the
     *                    device can verify the transfer against the grant's SHA-256.
     */
    performUpdate(device: ConnectedDevice, firmware: FirmwareInfo, grantBlob?: string): Promise<void>;
    private waitForReconnect;
    /**
     * Compare semantic versions
     */
    private isNewerVersion;
    /**
     * Clean up resources
     */
    destroy(): void;
}
export {};
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