/**
 * Task Scheduler
 * Schedule tasks for future execution with notifications
 */
export interface ScheduledTask {
    id: string;
    task: string;
    schedule: ScheduleSpec;
    chatId: string;
    enabled: boolean;
    created: string;
    lastRun?: string;
    nextRun?: string;
    runCount: number;
}
export type ScheduleSpec = {
    type: 'once';
    at: string;
} | {
    type: 'delay';
    ms: number;
} | {
    type: 'cron';
    pattern: string;
} | {
    type: 'interval';
    ms: number;
};
export type NotifyCallback = (chatId: string, message: string) => Promise<void>;
export declare class TaskScheduler {
    private tasks;
    private activeTimers;
    private notifyCallback?;
    private taskExecutor?;
    private dataPath;
    constructor(dataPath?: string);
    /**
     * Set the notification callback for sending messages
     */
    setNotifyCallback(callback: NotifyCallback): void;
    /**
     * Set the task executor callback
     */
    setTaskExecutor(executor: (task: string, chatId: string) => Promise<string>): void;
    /**
     * Parse natural language schedule
     */
    parseSchedule(when: string): ScheduleSpec | null;
    /**
     * Schedule a task
     */
    schedule(task: string, when: string | ScheduleSpec, chatId: string): string;
    /**
     * Calculate next run time
     */
    private calculateNextRun;
    /**
     * Activate a task's timer
     */
    private activateTask;
    /**
     * Deactivate a task's timer
     */
    private deactivateTask;
    /**
     * Cancel a task
     */
    cancel(taskId: string): boolean;
    /**
     * Pause a task
     */
    pause(taskId: string): boolean;
    /**
     * Resume a task
     */
    resume(taskId: string): boolean;
    /**
     * List all tasks
     */
    list(): ScheduledTask[];
    /**
     * Get a specific task
     */
    get(taskId: string): ScheduledTask | undefined;
    /**
     * Format schedule for display
     */
    formatSchedule(schedule: ScheduleSpec): string;
    /**
     * Save tasks to disk
     */
    private saveTasks;
    /**
     * Load tasks from disk
     */
    private loadTasks;
    /**
     * Stop all timers (for shutdown)
     */
    shutdown(): void;
}