Calculating the distance (#255)

* migra for distance

* adding distance calculator

* adding ability to store home address

* improve distance calculation

* calculating distance

* show distance in grid view

* upgrading dependencies

* moving to react 19

* ability to clone a job

* fixing tests

* polishing

lib/services/geocoding/autocompleteService.js

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { autocomplete as nominatimAutocomplete } from './client/nominatimClient.js';
+import logger from '../logger.js';
+
+/**
+ * Autocompletes an address using Nominatim.
+ *
+ * @param {string} query - The search query.
+ * @returns {Promise<string[]>} List of matching addresses.
+ */
+export async function autocompleteAddress(query) {
+  if (!query) {
+    return [];
+  }
+
+  try {
+    return await nominatimAutocomplete(query);
+  } catch (error) {
+    logger.error('Error during address autocomplete:', error);
+    return [];
+  }
+}

lib/services/geocoding/client/nominatimClient.js

@@ -100,6 +100,53 @@ async function doGeocode(address) {
   }
 }
 
+/**
+ * Autocompletes an address using Nominatim.
+ *
+ * @param {string} query - The search query.
+ * @returns {Promise<string[]>} List of matching addresses.
+ */
+async function doAutocomplete(query) {
+  if (Date.now() - last429 < PAUSE_DURATION) {
+    return [];
+  }
+
+  const url = `${API_URL}?q=${encodeURIComponent(query)}&format=json&addressdetails=1&limit=5&countrycodes=de`;
+
+  try {
+    const response = await fetch(url, {
+      agent,
+      headers: {
+        'User-Agent': userAgent,
+      },
+    });
+
+    if (response.status === 429) {
+      logger.warn('Nominatim rate limit hit. Pausing for 1 hour.');
+      last429 = Date.now();
+      return [];
+    }
+
+    if (!response.ok) {
+      logger.error(`Nominatim API error: ${response.status} ${response.statusText}`);
+      return [];
+    }
+
+    const data = await response.json();
+
+    if (Array.isArray(data)) {
+      return data.map((item) => item.display_name);
+    }
+
+    return [];
+  } catch (error) {
+    logger.error('Error during Nominatim autocomplete:', error);
+    return [];
+  }
+}
+
 export const geocode = throttle(doGeocode);
 
+export const autocomplete = throttle(doAutocomplete);
+
 export const isPaused = () => Date.now() - last429 < PAUSE_DURATION;

lib/services/geocoding/distanceService.js

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { distanceMeters } from '../listings/distanceCalculator.js';
+import {
+  getListingsToCalculateDistance,
+  getListingsForUserToCalculateDistance,
+  updateListingDistance,
+} from '../storage/listingsStorage.js';
+import { getUserSettings } from '../storage/settingsStorage.js';
+
+/**
+ * Calculates and updates distances for listings of a specific job.
+ * Only processes listings where distance_to_destination is null.
+ *
+ * @param {string} jobId
+ * @param {string} userId
+ * @returns {void}
+ */
+export function calculateDistanceForJob(jobId, userId) {
+  const userSettings = getUserSettings(userId);
+  const homeAddress = userSettings.home_address;
+
+  if (!homeAddress || !homeAddress.coords) {
+    return;
+  }
+
+  const listings = getListingsToCalculateDistance(jobId);
+  const { lat, lng } = homeAddress.coords;
+
+  for (const listing of listings) {
+    const dist = distanceMeters(lat, lng, listing.latitude, listing.longitude);
+    updateListingDistance(listing.id, dist);
+  }
+}
+
+/**
+ * Calculates and updates distances for all active listings of a user.
+ * Usually called when the user updates their home address.
+ *
+ * @param {string} userId
+ * @returns {void}
+ */
+export function calculateDistanceForUser(userId) {
+  const userSettings = getUserSettings(userId);
+  const homeAddress = userSettings.home_address;
+
+  if (!homeAddress || !homeAddress.coords) {
+    return;
+  }
+
+  const listings = getListingsForUserToCalculateDistance(userId);
+  const { lat, lng } = homeAddress.coords;
+
+  for (const listing of listings) {
+    const dist = distanceMeters(lat, lng, listing.latitude, listing.longitude);
+    updateListingDistance(listing.id, dist);
+  }
+}