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utils/gpxUtils.ts

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+import { ActivityStats } from '../types';
+
+export const parseGpxFile = async (file: File): Promise<ActivityStats> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+
+    reader.onload = (e) => {
+      try {
+        const text = e.target?.result as string;
+        const parser = new DOMParser();
+        const xmlDoc = parser.parseFromString(text, 'text/xml');
+
+        const trkpts = Array.from(xmlDoc.getElementsByTagName('trkpt'));
+        
+        if (trkpts.length === 0) {
+           // Fallback for rtept if no trkpt
+           const rtepts = Array.from(xmlDoc.getElementsByTagName('rtept'));
+           if (rtepts.length === 0) {
+             throw new Error('No track points found in GPX');
+           }
+        }
+
+        let totalDistance = 0;
+        let totalTime = 0;
+        let elevationGain = 0;
+        let startTime: Date | null = null;
+        let endTime: Date | null = null;
+        let lastEle: number | null = null;
+
+        for (let i = 0; i < trkpts.length; i++) {
+          const lat1 = parseFloat(trkpts[i].getAttribute('lat') || '0');
+          const lon1 = parseFloat(trkpts[i].getAttribute('lon') || '0');
+          const ele = parseFloat(trkpts[i].getElementsByTagName('ele')[0]?.textContent || '0');
+          const timeStr = trkpts[i].getElementsByTagName('time')[0]?.textContent;
+
+          if (i > 0) {
+            const lat2 = parseFloat(trkpts[i - 1].getAttribute('lat') || '0');
+            const lon2 = parseFloat(trkpts[i - 1].getAttribute('lon') || '0');
+            totalDistance += getDistanceFromLatLonInKm(lat1, lon1, lat2, lon2);
+
+            // Elevation gain
+            if (lastEle !== null && ele > lastEle) {
+                elevationGain += (ele - lastEle);
+            }
+          }
+
+          if (timeStr) {
+            const time = new Date(timeStr);
+            if (!startTime) startTime = time;
+            endTime = time;
+          }
+          
+          if (!isNaN(ele)) lastEle = ele;
+        }
+
+        if (startTime && endTime) {
+            totalTime = (endTime.getTime() - startTime.getTime()); // ms
+        }
+
+        resolve({
+          distance: `${totalDistance.toFixed(2)} km`,
+          duration: msToTime(totalTime),
+          elevation: `${Math.round(elevationGain)}m`,
+        });
+
+      } catch (error) {
+        reject(error);
+      }
+    };
+
+    reader.onerror = () => reject(new Error('Error reading file'));
+    reader.readAsText(file);
+  });
+};
+
+// Haversine formula
+function getDistanceFromLatLonInKm(lat1: number, lon1: number, lat2: number, lon2: number) {
+  const R = 6371; // Radius of the earth in km
+  const dLat = deg2rad(lat2 - lat1);
+  const dLon = deg2rad(lon2 - lon1);
+  const a =
+    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) *
+    Math.sin(dLon / 2) * Math.sin(dLon / 2);
+  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+  const d = R * c; // Distance in km
+  return d;
+}
+
+function deg2rad(deg: number) {
+  return deg * (Math.PI / 180);
+}
+
+function msToTime(duration: number) {
+    if (duration <= 0) return "0h 00m";
+    const minutes = Math.floor((duration / (1000 * 60)) % 60);
+    const hours = Math.floor((duration / (1000 * 60 * 60)) % 24);
+  
+    return `${hours}h ${minutes}m`;
+  }