/**
 * Section Tracking Manager for Grain Analytics
 * Intelligent scroll tracking with viewport metrics, visible sections, and engagement analysis
 */
import type { SectionConfig, SectionTrackingOptions } from './types/auto-tracking';
import type { ActivityDetector } from './activity';
export interface SectionTracker {
    trackSystemEvent(eventName: string, properties: Record<string, unknown>): void;
    hasConsent(category: 'analytics' | 'marketing' | 'functional'): boolean;
    getActivityDetector(): ActivityDetector;
    log(...args: unknown[]): void;
}
export declare class SectionTrackingManager {
    private tracker;
    private sections;
    private options;
    private isDestroyed;
    private sectionStates;
    private intersectionObserver;
    private xpathCache;
    private lastScrollPosition;
    private lastScrollTime;
    private scrollVelocity;
    private scrollDebounceTimer;
    private pendingEvents;
    private batchTimer;
    private sectionTimers;
    private readonly SPLIT_DURATION;
    private attentionQuality;
    constructor(tracker: SectionTracker, sections: SectionConfig[], options?: Partial<SectionTrackingOptions>);
    /**
     * Initialize section tracking
     */
    private initialize;
    /**
     * Setup IntersectionObserver for section visibility
     */
    private setupIntersectionObserver;
    /**
     * Setup scroll listener for velocity calculation
     */
    private setupScrollListener;
    /**
     * Initialize sections and start observing
     */
    private initializeSections;
    /**
     * Handle intersection observer entry
     */
    private handleIntersection;
    /**
     * Handle section entry (became visible)
     */
    private handleSectionEntry;
    /**
     * Start periodic tracking for a section (sends events every 3 seconds)
     */
    private startPeriodicTracking;
    /**
     * Stop periodic tracking for a section
     */
    private stopPeriodicTracking;
    /**
     * Handle section exit (became invisible)
     */
    private handleSectionExit;
    /**
     * Update scroll velocity
     */
    private updateScrollVelocity;
    /**
     * Calculate current scroll depth as percentage
     */
    private calculateScrollDepth;
    /**
     * Determine if section view should be tracked (sanitization)
     */
    private shouldTrackSection;
    /**
     * Queue section view for batching
     */
    private queueSectionView;
    /**
     * Flush pending section view events
     */
    private flushPendingEvents;
    /**
     * Find element by XPath selector
     */
    private findElementByXPath;
    /**
     * Log debug messages
     */
    private log;
    /**
     * Update sections configuration
     */
    updateSections(sections: SectionConfig[]): void;
    /**
     * Cleanup and destroy
     */
    destroy(): void;
}
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