geo coding, user service, listing for business

bizmatch-server/src/geo/geo.service.ts

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+import { Injectable } from '@nestjs/common';
+import { readFileSync } from 'fs';
+import path, { join } from 'path';
+import { City, Geo, State } from 'src/models/server.model.js';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+@Injectable()
+export class GeoService {
+    geo:Geo;
+    constructor() {
+        this.loadGeo();
+      }
+      private loadGeo(): void {
+        const filePath = join(__dirname,'..', 'assets', 'geo.json');
+        const rawData = readFileSync(filePath, 'utf8');
+        this.geo = JSON.parse(rawData);
+      }
+      
+      findCitiesStartingWith( prefix: string, state?:string): { city: string; state: string; state_code: string }[] {
+        const result: { city: string; state: string; state_code: string }[] = [];
+    
+        this.geo.states.forEach((state: State) => {
+            state.cities.forEach((city: City) => {
+                if (city.name.toLowerCase().startsWith(prefix.toLowerCase())) {
+                    result.push({
+                        city: city.name,
+                        state: state.name,
+                        state_code: state.state_code
+                    });
+                }
+            });
+        });
+        
+        return state ? result.filter(e=>e.state_code.toLowerCase()===state.toLowerCase()) :result;
+    }
+}
+