import type { SessionMetrics, MetricsHistoryEntry, UptimeStats } from './types.js';
import { pino } from 'pino';
export interface TrendAnalysis {
    period: {
        start: Date;
        end: Date;
    };
    trends: {
        latency: {
            direction: 'up' | 'down' | 'stable';
            change: number;
        };
        errors: {
            direction: 'up' | 'down' | 'stable';
            change: number;
        };
        usage: {
            direction: 'up' | 'down' | 'stable';
            change: number;
        };
    };
    peaks: {
        latency: {
            value: number;
            timestamp: Date;
        };
        errors: {
            value: number;
            timestamp: Date;
        };
        usage: {
            value: number;
            timestamp: Date;
        };
    };
}
export declare class AnalyticsEngine {
    private _logger;
    private metricsHistory;
    private startTime;
    constructor(logger?: pino.Logger);
    addMetricsSnapshot(metrics: SessionMetrics): void;
    getMetricsHistory(since?: Date): MetricsHistoryEntry[];
    analyzeTrends(periodMinutes?: number): TrendAnalysis;
    getUptimeStats(): UptimeStats;
    private calculateLatencyTrend;
    private calculateErrorTrend;
    private calculateUsageTrend;
    private findLatencyPeak;
    private findErrorPeak;
    private findUsagePeak;
    private getEmptyTrendAnalysis;
    clearOldMetrics(retentionPeriod: number): void;
    reset(): void;
}
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