All files / src/app/api/admin/monitoring/web-vitals route.ts

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export const dynamic = 'force-dynamic';

import { NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';
import { addSecurityHeaders } from '@/lib/security';
import {
  withAdmin,
  withErrorHandling,
  type ApiSuccessResponse,
  type ApiErrorResponse,
} from '@/lib/api';
import {
  calculateWebVitalStats,
  normalizePagePath,
  getWorstMetric,
  type WebVitalName,
  type WebVitalStats,
  type PageWebVitals,
} from '@/lib/observability/web-vitals';

/**
 * Web Vitals API Response
 */
interface WebVitalsResponse {
  /** Time period for the data */
  period: {
    hours: number;
    from: string;
    to: string;
  };
  /** Overall Web Vitals statistics */
  vitals: Record<WebVitalName, WebVitalStats>;
  /** Web Vitals broken down by page */
  byPage: PageWebVitals[];
  /** Total number of measurements */
  totalMeasurements: number;
}

/**
 * GET /api/admin/monitoring/web-vitals
 *
 * Returns aggregated Web Vitals metrics from RUM data.
 * Supports filtering by time period (hours query param).
 *
 * @param hours - Number of hours to look back (default: 24, max: 168)
 */
async function handleGet(
  request: Request
): Promise<NextResponse<ApiSuccessResponse<WebVitalsResponse> | ApiErrorResponse>> {
  const url = new URL(request.url);
  const hoursParam = url.searchParams.get('hours');
  const hours = Math.min(Math.max(parseInt(hoursParam || '24', 10) || 24, 1), 168);

  const now = new Date();
  const since = new Date(now.getTime() - hours * 60 * 60 * 1000);

  // Fetch all vitals events from the time period
  const vitalsEvents = await prisma.rumEvent.findMany({
    where: {
      type: 'vitals',
      timestamp: { gte: since },
    },
    select: {
      url: true,
      data: true,
      timestamp: true,
    },
    orderBy: { timestamp: 'desc' },
  });

  // Extract values for each metric
  const metricValues: Record<WebVitalName, number[]> = {
    LCP: [],
    CLS: [],
    FID: [],
    INP: [],
    FCP: [],
    TTFB: [],
  };

  // Also track by page
  const pageMetrics: Map<string, Record<WebVitalName, number[]>> = new Map();

  for (const event of vitalsEvents) {
    const data = event.data as Record<string, unknown>;
    const normalizedPath = normalizePagePath(event.url);

    // Initialize page metrics if needed
    if (!pageMetrics.has(normalizedPath)) {
      pageMetrics.set(normalizedPath, {
        LCP: [],
        CLS: [],
        FID: [],
        INP: [],
        FCP: [],
        TTFB: [],
      });
    }
    const pageData = pageMetrics.get(normalizedPath)!;

    // Extract each metric
    const metrics: WebVitalName[] = ['LCP', 'CLS', 'FID', 'INP', 'FCP', 'TTFB'];
    for (const metric of metrics) {
      const value = data[metric];
      if (typeof value === 'number' && !isNaN(value) && value >= 0) {
        metricValues[metric].push(value);
        pageData[metric].push(value);
      }
    }
  }

  // Calculate overall stats for each metric
  const vitals: Record<WebVitalName, WebVitalStats> = {
    LCP: calculateWebVitalStats('LCP', metricValues.LCP),
    CLS: calculateWebVitalStats('CLS', metricValues.CLS),
    FID: calculateWebVitalStats('FID', metricValues.FID),
    INP: calculateWebVitalStats('INP', metricValues.INP),
    FCP: calculateWebVitalStats('FCP', metricValues.FCP),
    TTFB: calculateWebVitalStats('TTFB', metricValues.TTFB),
  };

  // Calculate stats by page
  const byPage: PageWebVitals[] = [];
  for (const [url, metrics] of pageMetrics.entries()) {
    const pageStats: Partial<Record<WebVitalName, WebVitalStats>> = {};
    let hasData = false;

    for (const metric of ['LCP', 'CLS', 'FID', 'INP', 'FCP', 'TTFB'] as WebVitalName[]) {
      if (metrics[metric].length > 0) {
        pageStats[metric] = calculateWebVitalStats(metric, metrics[metric]);
        hasData = true;
      }
    }

    if (hasData) {
      byPage.push({
        url,
        metrics: pageStats,
        worstMetric: getWorstMetric(pageStats),
      });
    }
  }

  // Sort pages by worst performing first
  byPage.sort((a, b) => {
    const aRating = a.worstMetric?.rating || 'good';
    const bRating = b.worstMetric?.rating || 'good';
    const ratingOrder = { poor: 0, 'needs-improvement': 1, good: 2 };
    return ratingOrder[aRating] - ratingOrder[bRating];
  });

  // Limit to top 20 pages
  const topPages = byPage.slice(0, 20);

  const response: WebVitalsResponse = {
    period: {
      hours,
      from: since.toISOString(),
      to: now.toISOString(),
    },
    vitals,
    byPage: topPages,
    totalMeasurements: vitalsEvents.length,
  };

  return addSecurityHeaders(
    NextResponse.json({
      success: true,
      data: response,
    })
  ) as NextResponse<ApiSuccessResponse<WebVitalsResponse> | ApiErrorResponse>;
}

export const GET = withErrorHandling(withAdmin(handleGet));