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website/src/lib/logic/statistics.ts

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+import { ListItem, ListLevel } from '$lib/components/file-list/file-list';
+import { GPXFile, GPXStatistics, type Track } from 'gpx';
+
+export class GPXStatisticsTree {
+    level: ListLevel;
+    statistics: {
+        [key: string]: GPXStatisticsTree | GPXStatistics;
+    } = {};
+
+    constructor(element: GPXFile | Track) {
+        if (element instanceof GPXFile) {
+            this.level = ListLevel.FILE;
+            element.children.forEach((child, index) => {
+                this.statistics[index] = new GPXStatisticsTree(child);
+            });
+        } else {
+            this.level = ListLevel.TRACK;
+            element.children.forEach((child, index) => {
+                this.statistics[index] = child.getStatistics();
+            });
+        }
+    }
+
+    getStatisticsFor(item: ListItem): GPXStatistics {
+        let statistics = new GPXStatistics();
+        let id = item.getIdAtLevel(this.level);
+        if (id === undefined || id === 'waypoints') {
+            Object.keys(this.statistics).forEach((key) => {
+                if (this.statistics[key] instanceof GPXStatistics) {
+                    statistics.mergeWith(this.statistics[key]);
+                } else {
+                    statistics.mergeWith(this.statistics[key].getStatisticsFor(item));
+                }
+            });
+        } else {
+            let child = this.statistics[id];
+            if (child instanceof GPXStatistics) {
+                statistics.mergeWith(child);
+            } else if (child !== undefined) {
+                statistics.mergeWith(child.getStatisticsFor(item));
+            }
+        }
+        return statistics;
+    }
+}
+export type GPXFileWithStatistics = { file: GPXFile; statistics: GPXStatisticsTree };