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import { useLocation } from '@tanstack/react-router';
import { useCallback, useEffect, useRef, useState } from 'react';
export interface NavigationMetrics {
route: string;
timestamp: number;
loadTime?: number;
renderTime?: number;
ttfb?: number; // Time to first byte
fcp?: number; // First contentful paint
lcp?: number; // Largest contentful paint
}
interface PerformanceReport {
currentRoute: string;
metrics: NavigationMetrics;
averageLoadTime: number;
slowestRoute?: string;
fastestRoute?: string;
}
const METRICS_STORAGE_KEY = 'agent-navigation-metrics';
const MAX_STORED_METRICS = 100;
export function useNavigationPerformance() {
const location = useLocation();
const pathname = location.pathname;
const [metrics, setMetrics] = useState<NavigationMetrics[]>([]);
const [currentMetric, setCurrentMetric] = useState<NavigationMetrics | null>(
null,
);
const navigationStartTime = useRef<number>(0);
const observer = useRef<PerformanceObserver | null>(null);
const isMountedRef = useRef(true);
// Load stored metrics on mount
useEffect(() => {
if (typeof window === 'undefined') return;
try {
const stored = localStorage.getItem(METRICS_STORAGE_KEY);
if (stored && stored.trim() !== '') {
const parsedMetrics = JSON.parse(stored);
setMetrics(parsedMetrics.slice(-MAX_STORED_METRICS));
}
} catch (error) {
console.warn('Failed to load navigation metrics:', error);
// Clear corrupted data
try {
localStorage.removeItem(METRICS_STORAGE_KEY);
} catch {
// Ignore cleanup errors
}
}
}, []);
// Track navigation start
useEffect(() => {
isMountedRef.current = true;
if (typeof performance === 'undefined') return;
navigationStartTime.current = performance.now();
const metric: NavigationMetrics = {
route: pathname,
timestamp: Date.now(),
};
// Mark navigation start
performance.mark(`navigation-start-${pathname}`);
// Setup performance observer for paint timings
if (typeof window !== 'undefined' && 'PerformanceObserver' in window) {
try {
observer.current = new PerformanceObserver((list) => {
const entries = list.getEntries();
for (const entry of entries) {
if (entry.entryType === 'paint') {
if (entry.name === 'first-contentful-paint') {
metric.fcp = entry.startTime;
}
} else if (entry.entryType === 'largest-contentful-paint') {
metric.lcp = entry.startTime;
}
}
if (isMountedRef.current) {
setCurrentMetric({ ...metric });
}
});
observer.current.observe({
entryTypes: ['paint', 'largest-contentful-paint'],
});
} catch (error) {
console.warn('Performance observer setup failed:', error);
}
}
if (isMountedRef.current) {
setCurrentMetric(metric);
}
// Wait for page to fully load before measuring
let rafId: number | null = null;
let timeoutId: ReturnType<typeof setTimeout> | null = null;
const measurePerformance = () => {
// More realistic timing - wait for next microtask and then measure
Promise.resolve().then(() => {
if (typeof window === 'undefined' || !isMountedRef.current) return;
rafId = requestAnimationFrame(() => {
const renderTime = performance.now() - navigationStartTime.current;
// Final measurement after DOM settles
timeoutId = setTimeout(() => {
if (!isMountedRef.current) return;
const finalLoadTime =
performance.now() - navigationStartTime.current;
const finalMetric = {
...metric,
loadTime: finalLoadTime,
renderTime: renderTime,
};
// Mark navigation end
performance.mark(`navigation-end-${pathname}`);
// Measure navigation duration
try {
performance.measure(
`navigation-${pathname}`,
`navigation-start-${pathname}`,
`navigation-end-${pathname}`,
);
} catch (error) {
console.warn('Performance measure failed:', error);
}
if (isMountedRef.current) {
setCurrentMetric(finalMetric);
}
// Store metric
if (!isMountedRef.current) return;
setMetrics((prev) => {
const updated = [...prev, finalMetric].slice(-MAX_STORED_METRICS);
// Persist to localStorage
try {
localStorage.setItem(
METRICS_STORAGE_KEY,
JSON.stringify(updated),
);
} catch (error) {
console.warn('Failed to store navigation metrics:', error);
}
return updated;
});
}, 10); // Small delay to let DOM settle
});
});
};
// Use different strategies based on document state
if (typeof document !== 'undefined' && document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', measurePerformance, {
once: true,
});
} else if (
typeof document !== 'undefined' &&
document.readyState === 'interactive'
) {
// DOM is ready but resources might still be loading
if (typeof window !== 'undefined') {
window.addEventListener('load', measurePerformance, { once: true });
}
} else {
// Everything is already loaded
measurePerformance();
}
// Cleanup
return () => {
isMountedRef.current = false;
if (observer.current) {
observer.current.disconnect();
observer.current = null;
}
// Remove event listeners
if (typeof document !== 'undefined') {
document.removeEventListener('DOMContentLoaded', measurePerformance);
}
if (typeof window !== 'undefined') {
window.removeEventListener('load', measurePerformance);
}
// Cancel any pending RAF/timeout
if (typeof window !== 'undefined' && rafId != null) {
cancelAnimationFrame(rafId);
}
if (timeoutId != null) {
clearTimeout(timeoutId);
}
// Clear performance marks
try {
performance.clearMarks(`navigation-start-${pathname}`);
performance.clearMarks(`navigation-end-${pathname}`);
performance.clearMeasures(`navigation-${pathname}`);
} catch (_error) {
// Ignore cleanup errors
}
};
}, [pathname]);
// Calculate performance report - memoized to prevent recreating on every render
const getPerformanceReport = useCallback((): PerformanceReport | null => {
if (metrics.length === 0) return null;
const validMetrics = metrics.filter((m) => m.loadTime);
if (validMetrics.length === 0) return null;
const totalLoadTime = validMetrics.reduce(
(sum, m) => sum + (m.loadTime || 0),
0,
);
const averageLoadTime = totalLoadTime / validMetrics.length;
const sorted = [...validMetrics].sort(
(a, b) => (a.loadTime || 0) - (b.loadTime || 0),
);
const slowest = sorted[sorted.length - 1];
const fastest = sorted[0];
return {
currentRoute: pathname,
metrics: currentMetric || {
route: pathname,
timestamp: Date.now(),
},
averageLoadTime,
slowestRoute: slowest?.route,
fastestRoute: fastest?.route,
};
}, [metrics, pathname, currentMetric]);
// Get metrics for specific route - memoized
const getRouteMetrics = useCallback(
(route: string): NavigationMetrics[] => {
return metrics.filter((m) => m.route === route);
},
[metrics],
);
// Clear stored metrics - memoized
const clearMetrics = useCallback(() => {
setMetrics([]);
try {
localStorage.removeItem(METRICS_STORAGE_KEY);
} catch (error) {
console.warn('Failed to clear metrics:', error);
}
}, []);
// Log slow navigations
useEffect(() => {
if (currentMetric?.loadTime && currentMetric.loadTime > 100) {
console.warn('Slow navigation detected:', {
route: currentMetric.route,
loadTime: `${currentMetric.loadTime.toFixed(2)}ms`,
renderTime: currentMetric.renderTime
? `${currentMetric.renderTime.toFixed(2)}ms`
: 'N/A',
});
}
}, [currentMetric]);
return {
currentMetric,
metrics,
getPerformanceReport,
getRouteMetrics,
clearMetrics,
};
}
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