/**
 * UsageAnalyticsService - Epic 3: Attribution During Use
 *
 * Implements:
 * - Local SQLite analytics storage
 * - Usage tracking API with 30-day rolling window
 * - Export functionality (JSON, CSV)
 * - Value summary reports
 */
import type { Database as DatabaseType } from '../db/database-interface.js';
import type { UsageEvent, UsageEventInput, UsageAnalyticsSummary, ExportFormat } from './types.js';
export interface UsageStatsOptions {
    startDate?: string;
    endDate?: string;
    skillId?: string;
    userId?: string;
}
export declare class UsageAnalyticsService {
    private repo;
    private readonly RETENTION_DAYS;
    constructor(db: DatabaseType);
    /**
     * Track a skill usage event
     */
    trackUsage(input: UsageEventInput): UsageEvent;
    /**
     * Get usage summary for a time period (defaults to last 30 days)
     */
    getUsageSummary(options?: UsageStatsOptions): UsageAnalyticsSummary;
    /**
     * Get weekly digest for a user
     */
    getWeeklyDigest(userId: string): UsageAnalyticsSummary;
    /**
     * Get monthly summary for a user
     */
    getMonthlySummary(userId: string): UsageAnalyticsSummary;
    /**
     * Export usage data in specified format
     */
    exportUsageData(options: UsageStatsOptions & {
        format: ExportFormat;
    }): string;
    /**
     * Clean up events older than retention period
     */
    cleanupOldData(): number;
    private getDateRange;
    private getAllEvents;
    private groupEventsByType;
    private calculateAverageValueScore;
    private getTopSkills;
    private convertToCSV;
}
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