/**
 * Cron Engine — persistent scheduler with file-based storage.
 * Manages scheduled tasks with cron expressions, persists to ~/.opc/schedules.json,
 * and auto-recovers on startup.
 */
import type { JobHandler } from '../core/scheduler';
export interface ScheduleTask {
    id: string;
    name: string;
    schedule: string;
    description: string;
    frequency: 'daily' | 'weekly' | 'monthly' | 'custom';
    time?: string;
    outputChannel: 'telegram' | 'email' | 'web';
    enabled: boolean;
    createdAt: string;
    updatedAt: string;
    lastRun?: string;
    nextRun?: string;
}
export interface SchedulesStore {
    tasks: ScheduleTask[];
}
/** Convert frequency + time to cron expression */
export declare function frequencyToCron(frequency: string, time?: string): string;
export declare class CronEngine {
    private scheduler;
    private store;
    private handler;
    constructor(handler?: JobHandler);
    /** Initialize and recover persisted tasks */
    start(): void;
    stop(): void;
    listTasks(): ScheduleTask[];
    getTask(id: string): ScheduleTask | undefined;
    createTask(input: Omit<ScheduleTask, 'id' | 'createdAt' | 'updatedAt' | 'lastRun' | 'nextRun'>): ScheduleTask;
    updateTask(id: string, updates: Partial<ScheduleTask>): ScheduleTask | null;
    deleteTask(id: string): boolean;
    runTask(id: string): Promise<boolean>;
}
//# sourceMappingURL=cron-engine.d.ts.map