420 lines
14 KiB
JavaScript
420 lines
14 KiB
JavaScript
globalThis.Wegwichtel = globalThis.Wegwichtel || {};
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(function (ns) {
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'use strict';
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const STORAGE_PREFIX = 'wegwichtel.local-routes.v1';
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const INDEX_KEY = `${STORAGE_PREFIX}.index`;
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const GPX_NAMESPACE = 'http://www.topografix.com/GPX/1/1';
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const POI_NAMESPACE = 'urn:wegwichtel:poi';
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let poiCounter = 0;
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function storage() {
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const target = globalThis.localStorage;
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if (!target) throw new Error('Lokaler Browser-Speicher ist auf diesem Gerät nicht verfügbar.');
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return target;
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}
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function routeKey(id, suffix) {
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return `${STORAGE_PREFIX}.${encodeURIComponent(String(id))}.${suffix}`;
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}
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function readIndex() {
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const raw = storage().getItem(INDEX_KEY);
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if (!raw) return [];
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try {
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const parsed = JSON.parse(raw);
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return Array.isArray(parsed) ? parsed.map(String) : [];
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} catch {
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return [];
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}
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}
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function writeIndex(ids) {
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storage().setItem(INDEX_KEY, JSON.stringify([...new Set(ids.map(String))]));
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}
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function createRouteId() {
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if (globalThis.crypto?.randomUUID) return `local-${globalThis.crypto.randomUUID()}`;
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return `local-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`;
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}
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function createPoiId() {
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poiCounter = (poiCounter + 1) % 1000;
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return (Date.now() * 1000) + poiCounter;
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}
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function escapeXml(value) {
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return String(value ?? '')
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.replaceAll('&', '&')
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.replaceAll('<', '<')
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.replaceAll('>', '>')
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.replaceAll('"', '"')
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.replaceAll("'", ''');
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}
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function emptyGpx(name = 'Neue Strecke') {
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const safeName = escapeXml(name);
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return `<?xml version="1.0" encoding="UTF-8"?>\n`
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+ `<gpx version="1.1" creator="Wegwichtel" xmlns="${GPX_NAMESPACE}" xmlns:wegwichtel="${POI_NAMESPACE}">\n`
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+ ` <metadata><name>${safeName}</name></metadata>\n`
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+ ` <trk><name>${safeName}</name><trkseg></trkseg></trk>\n`
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+ '</gpx>';
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}
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function parseXml(gpx) {
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const parser = new DOMParser();
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const document = parser.parseFromString(String(gpx || ''), 'application/xml');
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if (document.querySelector('parsererror') || document.documentElement?.localName !== 'gpx') {
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throw new Error('Die GPX-Datei ist nicht gültig.');
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}
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return document;
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}
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function directChildrenByLocalName(parent, localName) {
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return Array.from(parent?.children || []).filter(node => node.localName === localName);
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}
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function firstDescendantByLocalName(parent, localName) {
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return Array.from(parent?.getElementsByTagName('*') || []).find(node => node.localName === localName) || null;
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}
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function textOfChild(parent, localName) {
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return directChildrenByLocalName(parent, localName)[0]?.textContent?.trim() || '';
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}
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function numberAttribute(node, name) {
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const value = Number.parseFloat(node?.getAttribute(name));
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return Number.isFinite(value) ? value : null;
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}
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function waypointId(node) {
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const extension = firstDescendantByLocalName(node, 'poiId');
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const parsed = Number(extension?.textContent);
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return Number.isSafeInteger(parsed) ? parsed : createPoiId();
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}
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function parseWaypoints(gpx) {
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const document = parseXml(gpx);
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return Array.from(document.getElementsByTagNameNS('*', 'wpt')).map((node, index) => ({
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id: waypointId(node),
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title: textOfChild(node, 'name') || `Station ${index + 1}`,
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description: textOfChild(node, 'desc'),
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lat: numberAttribute(node, 'lat'),
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lon: numberAttribute(node, 'lon'),
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triggerRadiusM: 25,
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sequence: index,
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audio: null,
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images: []
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})).filter(poi => poi.lat != null && poi.lon != null);
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}
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function createElement(document, localName, text = null) {
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const element = document.createElementNS(GPX_NAMESPACE, localName);
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if (text != null) element.textContent = String(text);
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return element;
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}
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function updateMetadataName(document, name) {
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const root = document.documentElement;
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let metadata = directChildrenByLocalName(root, 'metadata')[0];
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if (!metadata) {
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metadata = createElement(document, 'metadata');
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root.insertBefore(metadata, root.firstChild);
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}
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let nameElement = directChildrenByLocalName(metadata, 'name')[0];
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if (!nameElement) {
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nameElement = createElement(document, 'name');
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metadata.appendChild(nameElement);
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}
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nameElement.textContent = name;
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}
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function syncGpx(gpx, route, pois) {
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const document = parseXml(gpx || emptyGpx(route?.name));
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const root = document.documentElement;
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updateMetadataName(document, route?.name || 'Neue Strecke');
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Array.from(document.getElementsByTagNameNS('*', 'wpt')).forEach(node => node.remove());
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const orderedPois = [...(pois || [])].sort((left, right) => Number(left.sequence) - Number(right.sequence));
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orderedPois.forEach((poi, index) => {
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if (!Number.isFinite(Number(poi.lat)) || !Number.isFinite(Number(poi.lon))) {
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throw new Error(`Für ${poi.title || `Station ${index + 1}`} fehlen gültige Koordinaten.`);
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}
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const waypoint = createElement(document, 'wpt');
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waypoint.setAttribute('lat', String(Number(poi.lat)));
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waypoint.setAttribute('lon', String(Number(poi.lon)));
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waypoint.appendChild(createElement(document, 'name', poi.title || `Station ${index + 1}`));
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if (poi.description) waypoint.appendChild(createElement(document, 'desc', poi.description));
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const extensions = createElement(document, 'extensions');
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const poiId = document.createElementNS(POI_NAMESPACE, 'wegwichtel:poiId');
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poiId.textContent = String(poi.id);
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extensions.appendChild(poiId);
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waypoint.appendChild(extensions);
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const routeOrTrack = directChildrenByLocalName(root, 'rte')[0]
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|| directChildrenByLocalName(root, 'trk')[0]
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|| null;
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root.insertBefore(waypoint, routeOrTrack);
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});
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return new XMLSerializer().serializeToString(document);
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}
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function readPackage(id) {
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const target = storage();
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const gpx = target.getItem(routeKey(id, 'gpx'));
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const rawJson = target.getItem(routeKey(id, 'json'));
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if (!gpx || !rawJson) return null;
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try {
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const metadata = JSON.parse(rawJson);
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return {
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id: String(id),
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gpx,
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route: metadata.route || {},
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pois: Array.isArray(metadata.pois) ? metadata.pois : [],
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schemaVersion: metadata.schemaVersion || 1
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};
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} catch {
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return null;
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}
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}
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function restoreValue(target, key, value) {
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if (value == null) target.removeItem(key);
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else target.setItem(key, value);
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}
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function notify(id, action) {
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if (typeof document === 'undefined' || typeof CustomEvent === 'undefined') return;
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document.dispatchEvent(new CustomEvent('wegwichtel:local-routes-changed', {
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detail: { action, id: String(id) }
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}));
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}
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function savePackage(routePackage) {
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const target = storage();
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const id = String(routePackage.id || routePackage.route?.id || createRouteId());
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const previousIndex = target.getItem(INDEX_KEY);
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const gpxKey = routeKey(id, 'gpx');
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const jsonKey = routeKey(id, 'json');
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const previousGpx = target.getItem(gpxKey);
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const previousJson = target.getItem(jsonKey);
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const now = new Date().toISOString();
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const inputRoute = routePackage.route || {};
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const route = {
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id,
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name: String(inputRoute.name || ''),
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description: String(inputRoute.description || ''),
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createdAt: inputRoute.createdAt || now,
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updatedAt: now
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};
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const pois = (routePackage.pois || []).map((poi, index) => ({
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...poi,
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id: Number.isSafeInteger(Number(poi.id)) ? Number(poi.id) : createPoiId(),
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sequence: index
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}));
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const gpx = syncGpx(routePackage.gpx || emptyGpx(route.name), route, pois);
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const metadata = JSON.stringify({ schemaVersion: 1, route, pois });
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try {
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target.setItem(gpxKey, gpx);
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target.setItem(jsonKey, metadata);
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writeIndex([...readIndex(), id]);
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} catch (error) {
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try {
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restoreValue(target, gpxKey, previousGpx);
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restoreValue(target, jsonKey, previousJson);
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restoreValue(target, INDEX_KEY, previousIndex);
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} catch {
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// Die ursprüngliche Speicherfehlermeldung ist aussagekräftiger.
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}
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const name = error?.name === 'QuotaExceededError' ? 'Der lokale Browser-Speicher ist voll.' : 'Die lokale Strecke konnte nicht gespeichert werden.';
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throw new Error(`${name} Bilder und Audiodateien können das Local-Storage-Limit schnell erreichen.`, { cause: error });
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}
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notify(id, 'saved');
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return readPackage(id);
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}
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function remove(id) {
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const target = storage();
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const routeId = String(id);
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target.removeItem(routeKey(routeId, 'gpx'));
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target.removeItem(routeKey(routeId, 'json'));
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writeIndex(readIndex().filter(item => item !== routeId));
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notify(routeId, 'removed');
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}
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function listPackages() {
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return readIndex().map(readPackage).filter(Boolean);
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}
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function routePoints(gpx) {
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const document = parseXml(gpx);
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const trackPoints = Array.from(document.getElementsByTagNameNS('*', 'trkpt'));
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const routePoints = Array.from(document.getElementsByTagNameNS('*', 'rtept'));
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const selected = trackPoints.length ? trackPoints : routePoints;
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return selected.map(node => {
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const elevation = Number.parseFloat(textOfChild(node, 'ele'));
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return {
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lat: numberAttribute(node, 'lat'),
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lon: numberAttribute(node, 'lon'),
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elevation: Number.isFinite(elevation) ? elevation : null,
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recordedAt: textOfChild(node, 'time') || null
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};
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}).filter(point => point.lat != null && point.lon != null);
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}
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function radians(value) {
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return value * (Math.PI / 180);
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}
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function meters(left, right) {
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const earthRadius = 6371008.8;
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const latDelta = radians(right.lat - left.lat);
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const lonDelta = radians(right.lon - left.lon);
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const leftLat = radians(left.lat);
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const rightLat = radians(right.lat);
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const value = Math.sin(latDelta / 2) ** 2
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+ Math.cos(leftLat) * Math.cos(rightLat) * (Math.sin(lonDelta / 2) ** 2);
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return earthRadius * 2 * Math.atan2(Math.sqrt(value), Math.sqrt(1 - value));
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}
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function metrics(points) {
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if (!points.length) {
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return {
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bounds: null,
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center: null,
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distanceM: 0,
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elevationGainM: 0,
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start: null
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};
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}
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let distanceM = 0;
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let elevationGainM = 0;
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for (let index = 1; index < points.length; index += 1) {
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distanceM += meters(points[index - 1], points[index]);
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const previous = points[index - 1].elevation;
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const current = points[index].elevation;
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if (Number.isFinite(previous) && Number.isFinite(current) && current > previous) elevationGainM += current - previous;
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}
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const lats = points.map(point => point.lat);
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const lons = points.map(point => point.lon);
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const bounds = {
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minLat: Math.min(...lats),
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minLon: Math.min(...lons),
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maxLat: Math.max(...lats),
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maxLon: Math.max(...lons)
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};
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return {
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bounds,
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center: {
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lat: (bounds.minLat + bounds.maxLat) / 2,
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lon: (bounds.minLon + bounds.maxLon) / 2
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},
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distanceM,
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elevationGainM,
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start: { lat: points[0].lat, lon: points[0].lon }
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};
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}
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function appPoi(poi) {
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return {
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id: Number(poi.id),
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title: poi.title || 'Unbenannte Station',
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description: poi.description || '',
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lat: Number(poi.lat),
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lon: Number(poi.lon),
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triggerRadiusM: Number(poi.triggerRadiusM) || 25,
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sequence: Number(poi.sequence) || 0,
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audioUrl: poi.audio?.dataUrl || null,
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images: (poi.images || []).map((image, index) => ({
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id: image.id || `${poi.id}-${index}`,
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caption: image.caption || '',
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sequence: index,
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url: image.dataUrl
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})).filter(image => image.url)
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};
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}
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function toAppRoute(routePackage) {
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const pois = (routePackage.pois || []).map(appPoi).sort((left, right) => left.sequence - right.sequence);
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const parsedPoints = routePoints(routePackage.gpx);
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const points = parsedPoints.length
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? parsedPoints
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: pois.map(poi => ({ lat: poi.lat, lon: poi.lon, elevation: null, recordedAt: null }));
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const routeMetrics = metrics(points);
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return {
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id: String(routePackage.id),
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source: 'local',
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local: true,
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name: routePackage.route?.name || 'Unbenannte Strecke',
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description: routePackage.route?.description || '',
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schoolName: 'Lokal gespeichert',
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status: 'local',
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activatedAt: null,
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points,
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pois,
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pointCount: points.length,
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gpxUrl: null,
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createdAt: routePackage.route?.createdAt || null,
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updatedAt: routePackage.route?.updatedAt || null,
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...routeMetrics
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};
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}
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function listAppRoutes() {
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return listPackages().map(toAppRoute);
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}
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function getAppRoute(id) {
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const routePackage = readPackage(id);
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if (!routePackage) throw new Error('Die lokale Strecke wurde nicht gefunden.');
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return toAppRoute(routePackage);
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}
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function readFileAsText(file) {
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if (!file) return Promise.resolve('');
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if (typeof file.text === 'function') return file.text();
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.addEventListener('load', () => resolve(String(reader.result || '')), { once: true });
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reader.addEventListener('error', () => reject(reader.error || new Error('Datei konnte nicht gelesen werden.')), { once: true });
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reader.readAsText(file);
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});
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}
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function fileToDataUrl(file) {
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if (!file) return Promise.resolve(null);
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return new Promise((resolve, reject) => {
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const reader = new FileReader();
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reader.addEventListener('load', () => resolve({
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dataUrl: String(reader.result || ''),
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name: file.name || 'Datei',
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size: Number(file.size) || 0,
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type: file.type || 'application/octet-stream'
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}), { once: true });
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reader.addEventListener('error', () => reject(reader.error || new Error('Datei konnte nicht gelesen werden.')), { once: true });
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reader.readAsDataURL(file);
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});
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}
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ns.LocalRoutes = Object.freeze({
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STORAGE_PREFIX,
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createPoiId,
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createRouteId,
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emptyGpx,
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fileToDataUrl,
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get: readPackage,
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getAppRoute,
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list: listPackages,
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listAppRoutes,
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parseWaypoints,
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readFileAsText,
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remove,
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save: savePackage,
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syncGpx,
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toAppRoute
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});
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}(globalThis.Wegwichtel));
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