import { Repository } from 'typeorm';
import { NotificationQueue, NotificationLog, Notification, NotificationChannel } from '../entities';
export interface QueueItem {
    id: string;
    notification_id: string;
    channel: NotificationChannel;
    priority_value: number;
    attempts: number;
    notification: Notification;
}
export interface QueueStats {
    queued: number;
    processing: number;
    sent: number;
    failed: number;
    retrying: number;
}
export declare class NotificationQueueService {
    private readonly queueRepository;
    private readonly logRepository;
    private readonly notificationRepository;
    private readonly logger;
    constructor(queueRepository: Repository<NotificationQueue>, logRepository: Repository<NotificationLog>, notificationRepository: Repository<Notification>);
    enqueue(notificationId: string, channel: NotificationChannel, priority?: 'low' | 'normal' | 'high' | 'urgent', scheduledFor?: Date): Promise<NotificationQueue>;
    enqueueBatch(notificationId: string, channels: NotificationChannel[], priority?: 'low' | 'normal' | 'high' | 'urgent'): Promise<NotificationQueue[]>;
    getPendingItems(limit?: number, channel?: NotificationChannel): Promise<QueueItem[]>;
    markAsProcessing(queueId: string): Promise<void>;
    markAsSent(queueId: string, provider?: string, providerMessageId?: string, providerResponse?: Record<string, any>): Promise<void>;
    markAsFailed(queueId: string, errorMessage: string, provider?: string): Promise<void>;
    getStats(): Promise<QueueStats>;
    getStatsByChannel(): Promise<Array<{
        channel: string;
        status: string;
        count: number;
    }>>;
    cleanupOldItems(daysToKeep?: number): Promise<number>;
    cancelPending(notificationId: string): Promise<number>;
    private getPriorityValue;
}