first commit

apps/frontend/lib/geocoding.ts

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+export interface ParsedAddress {
+  city: string;
+  street: string;
+  house: string;
+  fullAddress: string;
+}
+
+const NOMINATIM_HEADERS = {
+  'User-Agent': 'LendryID/1.0 (contact@lendry.ru)',
+  Accept: 'application/json'
+};
+
+export async function reverseGeocode(lat: number, lng: number): Promise<ParsedAddress | null> {
+  try {
+    const url = `https://nominatim.openstreetmap.org/reverse?format=jsonv2&lat=${encodeURIComponent(String(lat))}&lon=${encodeURIComponent(String(lng))}&accept-language=ru`;
+    const response = await fetch(url, { headers: NOMINATIM_HEADERS });
+    if (!response.ok) return null;
+    const data = (await response.json()) as {
+      display_name?: string;
+      address?: Record<string, string | undefined>;
+    };
+    const addr = data.address ?? {};
+    const city = addr.city || addr.town || addr.village || addr.municipality || addr.state || '';
+    const street = addr.road || addr.pedestrian || addr.footway || addr.neighbourhood || '';
+    const house = addr.house_number || '';
+    return {
+      city,
+      street,
+      house,
+      fullAddress: data.display_name ?? formatParsed(city, street, house)
+    };
+  } catch {
+    return null;
+  }
+}
+
+export async function forwardGeocode(query: string): Promise<{ lat: number; lng: number; parsed: ParsedAddress } | null> {
+  const trimmed = query.trim();
+  if (!trimmed) return null;
+  try {
+    const url = `https://nominatim.openstreetmap.org/search?format=jsonv2&q=${encodeURIComponent(trimmed)}&limit=1&accept-language=ru`;
+    const response = await fetch(url, { headers: NOMINATIM_HEADERS });
+    if (!response.ok) return null;
+    const data = (await response.json()) as Array<{
+      lat: string;
+      lon: string;
+      display_name?: string;
+      address?: Record<string, string | undefined>;
+    }>;
+    const first = data[0];
+    if (!first) return null;
+    const addr = first.address ?? {};
+    const city = addr.city || addr.town || addr.village || addr.municipality || '';
+    const street = addr.road || addr.pedestrian || '';
+    const house = addr.house_number || '';
+    return {
+      lat: Number(first.lat),
+      lng: Number(first.lon),
+      parsed: {
+        city,
+        street,
+        house,
+        fullAddress: first.display_name ?? formatParsed(city, street, house)
+      }
+    };
+  } catch {
+    return null;
+  }
+}
+
+function formatParsed(city: string, street: string, house: string) {
+  const parts = [];
+  if (city) parts.push(`г. ${city}`);
+  if (street || house) parts.push([street, house].filter(Boolean).join(', '));
+  return parts.join(', ');
+}