Fix issue with localhost refs

Reviewed-on: #5

.claude/settings.local.json

@@ -0,0 +1,10 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(npm test:*)",
+      "Bash(npm run:*)",
+      "Bash(npx playwright:*)",
+      "Bash(node -e ':*)"
+    ]
+  }
+}

.gitea/workflows/test.yml

@@ -0,0 +1,55 @@
+name: Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  backend-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+          # cache: ''npm''
+          # cache-dependency-path: backend/package-lock.json
+      - name: Install dependencies
+        run: cd backend && npm ci
+      - name: Run tests
+        run: cd backend && npm test
+
+  frontend-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+          # cache: 'npm'
+          # cache-dependency-path: frontend/package-lock.json
+      - name: Install dependencies
+        run: cd frontend && npm ci
+      - name: Run unit tests
+        run: cd frontend && npm test -- --run
+
+  e2e-test:
+    runs-on: ubuntu-latest
+    container:
+      image: mcr.microsoft.com/playwright:v1.58.2-noble
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+          # cache: 'npm'
+          # cache-dependency-path: frontend/package-lock.json
+      - name: Install dependencies
+        run: cd frontend && npm install
+      - name: Run E2E tests
+        run: cd frontend && npm run test:e2e

.github/copilot-instructions.md

@@ -0,0 +1,70 @@
+# Copilot Instructions for line-of-sight
+
+## Purpose
+This repository is a full-stack geospatial app:
+- `frontend/`: React + Vite + MapLibre UI
+- `backend/`: Express API with PostGIS queries
+- `docker/` and `docker-compose.yml`: local orchestration and DB initialization
+
+Prefer small, focused changes that keep frontend/backend contracts stable.
+
+## First Commands to Know
+Use these commands first when validating changes.
+
+### Docker-first workflow (preferred)
+- Start stack: `docker-compose up --build`
+- Stop stack: `docker-compose down`
+- Backend tests: `docker-compose exec backend npm test`
+- Frontend unit tests: `docker-compose exec frontend npm test -- --run`
+- Frontend E2E tests: `docker-compose exec frontend npm run test:e2e`
+- Seed geodata: `docker-compose exec backend npm run seed-data`
+
+### Local workflow (without Docker)
+- Root Node version: `nvm use` (uses `.nvmrc`, currently Node 24)
+- Backend dev: `cd backend && npm install && npm run dev`
+- Frontend dev: `cd frontend && npm install && npm run start`
+
+## Architecture and Boundaries
+- Backend API entrypoint: `backend/app/server.js`
+  - Defines `GET /api/line-of-sight` and `GET /api/health`
+  - Performs destination/path generation and PostGIS querying
+- Frontend app entrypoint: `frontend/src/App.jsx`
+  - Owns map lifecycle, animation, and UI state
+  - Calls backend via `frontend/src/services/api.js`
+- Database bootstrap: `docker/init.sql`
+  - Enables PostGIS and creates `cities` with spatial index
+
+When changing behavior, prefer backend geospatial logic over duplicating calculations in the frontend.
+
+## Project Conventions
+- Keep geospatial coordinates in WGS84 (`SRID 4326`) and preserve existing lat/lon parameter naming.
+- Keep API responses JSON-compatible and backward compatible unless explicitly requested.
+- Keep frontend styles in `frontend/src/styles/` (project uses custom CSS, not utility CSS frameworks).
+- Avoid broad refactors in `App.jsx` unless task requires it; map lifecycle and refs are tightly coupled.
+
+## Testing Expectations
+- Backend tests live in `backend/tests/` and use Jest + Supertest.
+- Frontend unit tests live in `frontend/src/__tests__/` and use Vitest + Testing Library.
+- E2E tests live in `frontend/e2e/` and use Playwright.
+- For feature changes:
+  - Run the closest unit tests first.
+  - Run E2E tests when user flows or map interactions are changed.
+
+## Common Pitfalls
+- PostGIS must be available before backend geospatial endpoints are exercised.
+- `docker-compose.yml` pins Postgres service to `linux/arm64`; this can affect non-ARM hosts.
+- Data import script (`backend/scripts/import_cities.js`) depends on `wget` and `unzip` availability.
+- `README.md` contains roadmap/history notes; trust current scripts/config in source files first.
+
+## CI Notes
+CI config is in `.gitea/workflows/test.yml`.
+- Backend and frontend tests run on Node 24.
+- Frontend unit tests run with `npm test -- --run`.
+- E2E runs in Playwright container.
+
+## Link, Do Not Duplicate
+For detailed setup and product context, reference:
+- `README.md`
+- `GEMINI.md`
+
+Keep this file focused on actionable agent guidance and repo-specific guardrails.

CLAUDE.md

@@ -0,0 +1,112 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What This Project Is
+
+**Line of Sight** is a geospatial web app that draws a great-circle line from a user-selected point on Earth in a chosen direction, then finds all cities along that path. It includes a flight-over animation that speeds up 20x over water and slows to normal speed over land.
+
+## Commands
+
+### Docker (preferred workflow)
+
+```bash
+docker-compose up --build       # Start all services (frontend :3050, backend :3051, postgres)
+docker-compose down             # Stop all services
+docker-compose logs -f          # View logs
+
+# Run tests inside containers
+docker-compose exec backend npm test
+docker-compose exec frontend npm test -- --run
+docker-compose exec frontend npm run test:e2e
+```
+
+### Local development (without Docker)
+
+```bash
+# Backend
+cd backend && npm run dev       # Nodemon dev server on :3051
+
+# Frontend
+cd frontend && npm run start    # Vite dev server on :3050
+```
+
+### Tests
+
+```bash
+# Backend unit tests (Jest + Supertest)
+cd backend && npm test
+
+# Frontend unit tests (Vitest)
+cd frontend && npm test          # Watch mode
+cd frontend && npm test -- --run # Single run (CI mode)
+
+# E2E tests (Playwright)
+cd frontend && npm run test:e2e
+
+# Seed the database with GeoNames city data
+cd backend && npm run seed-data
+```
+
+### Build
+
+```bash
+cd frontend && npm run build    # Vite production build → frontend/build/
+```
+
+## Architecture
+
+This is a monorepo with three services orchestrated by Docker Compose:
+
+```
+frontend/  → React 19 + Vite 6 SPA (MapLibre GL, Turf.js, Axios)
+backend/   → Node 24 + Express 5 REST API
+docker/    → PostgreSQL + PostGIS initialization
+```
+
+### Data flow
+
+1. User clicks map → sets start point (lat/lon)
+2. User selects direction (0–360°) and tolerance (km radius)
+3. Frontend calls `GET /api/line-of-sight?lat=&lon=&direction=&tolerance=`
+4. Backend generates 80 path points along a great-circle arc (up to 20,000 km)
+5. For each point, a PostGIS `ST_DWithin()` query finds cities within tolerance
+6. Backend also checks whether each point is over land (500 km radius land check)
+7. Response includes line coordinates with per-point water flags and matching cities
+8. Frontend renders the path on a 3D globe map and shows city markers
+
+### Backend: `backend/app/server.js`
+
+Single-file Express app. Key internals:
+- `calculateDestination()` — Haversine formula for great-circle destination points
+- `GET /api/line-of-sight` — main endpoint: path generation + PostGIS city lookup
+- `GET /api/health` — health check
+- Returns up to 200 cities ordered by position along the line
+
+### Frontend: `frontend/src/App.jsx`
+
+Single large React component (~687 lines) managing all state and map logic:
+- MapLibre GL map with 3D globe projection and terrain/sky effects
+- Direction slider drives a live preview line before the user commits
+- After "Show Line of Sight", map locks (prevents moving start point)
+- Flight animation uses Turf.js to interpolate positions along the path; speed is 1× over land, 20× over water with smooth acceleration (0.005 step), predictive look-ahead of 2000 km
+- New cities are fetched every 2000 km during flight via the same API
+- Three map styles: light, dark, satellite (Esri tiles)
+
+### Database
+
+PostGIS `cities` table with a GIST index on `geom GEOGRAPHY(POINT, 4326)`. All coordinates use WGS84 / SRID 4326. The init SQL seeds 10 major cities; the `seed-data` script imports from GeoNames for a fuller dataset.
+
+## Conventions
+
+- **Geospatial**: WGS84 / SRID 4326 everywhere; PostGIS `GEOGRAPHY` type for distance queries
+- **API**: RESTful; query params for `GET /api/line-of-sight`; env var `VITE_API_URL` (frontend) or `DATABASE_URL` (backend)
+- **Styling**: Plain CSS files in `frontend/src/styles/` — no CSS framework
+- **Tests**: Backend mocks the `pg` Pool; frontend mocks MapLibre GL and the API service. E2E tests use Playwright with a mock API response
+
+## CI
+
+Gitea workflow (`.gitea/workflows/test.yml`) runs on push/PR to `main`:
+1. **backend-test** — `npm ci && npm test`
+2. **frontend-test** — `npm ci && npm test -- --run`
+3. **e2e-test** — uses `mcr.microsoft.com/playwright:v1.50.1` container

GEMINI.md

@@ -68,6 +68,17 @@
 
 ---
 
+## 📊 Data Management
+The project includes a compressed dataset of ~68,000 cities from Natural Earth.
+
+| Action | Command |
+| :--- | :--- |
+| **Import/Refresh Data** | `./import-cities.sh` |
+
+*Note: The script will truncate the `cities` table and perform a fresh import of the global dataset stored in `docker/data/cities.csv.gz`.*
+
+---
+
 ## 📝 Roadmap Highlights
 - [ ] Implement real ST_DWithin() PostGIS queries in the backend.
 - [ ] Import full Natural Earth/GeoNames datasets into the `cities` table.

README.md

@@ -51,8 +51,8 @@ docker-compose up --build
 
 ### 3. Access Application
 
-- **Frontend**: http://localhost:3000
+- **Frontend**: http://localhost:3050
-- **Backend API**: http://localhost:3001
+- **Backend API**: http://localhost:3051
 - **Database**: localhost:5432 (PostgreSQL with PostGIS)
 
 ## 🎮 How to Use
@@ -219,8 +219,8 @@ npm run dev
 ### Port Already in Use
 ```bash
 # Find process using port
-lsof -i :3000
+lsof -i :3050
-lsof -i :3001
+lsof -i :3051
 
 # Kill process
 kill -9 <PID>

backend/Dockerfile

@@ -10,7 +10,7 @@ RUN npm install
 COPY . .
 
 # Expose port
-EXPOSE 3001
+EXPOSE 3051
 
 # Start server
 CMD ["npm", "start"]

backend/app/server.js

@@ -1,73 +1,186 @@
 const express = require('express');
 const cors = require('cors');
+const { Pool } = require('pg');
 require('dotenv').config();
 
 const app = express();
-const PORT = process.env.PORT || 3001;
+const PORT = process.env.PORT || 3051;
+
+const pool = new Pool({
+  connectionString: process.env.DATABASE_URL || 'postgresql://line_of_sight:line_of_sight_pass@postgres:5432/line_of_sight'
+});
 
 app.use(cors());
 app.use(express.json());
 
-// Mock conurbation data for MVP
+const calculateDestination = (lat, lon, bearing, distance) => {
-const MOCK_CONURBATIONS = [
+  const R = 6371;
-  { id: 1, name: "London", population: 9000000, distance_km: 0, lat: 51.5074, lon: -0.1278 },
+  const brng = (bearing * Math.PI) / 180;
-  { id: 2, name: "Paris", population: 2161000, distance_km: 344, lat: 48.8566, lon: 2.3522 },
+  const φ1 = (lat * Math.PI) / 180;
-  { id: 3, name: "Berlin", population: 3644000, distance_km: 878, lat: 52.5200, lon: 13.4050 },
+  const λ1 = (lon * Math.PI) / 180;
-  { id: 4, name: "Warsaw", population: 1793000, distance_km: 1200, lat: 52.2297, lon: 21.0122 },
+  const δ = distance / R;
-  { id: 5, name: "Moscow", population: 12506000, distance_km: 2063, lat: 55.7558, lon: 37.6173 },
-  { id: 6, name: "Kazan", population: 1257000, distance_km: 2850, lat: 55.7897, lon: 49.1219 },
-  { id: 7, name: "Almaty", population: 2000000, distance_km: 3900, lat: 43.2220, lon: 76.8512 },
-  { id: 8, name: "Urumqi", population: 3500000, distance_km: 4500, lat: 43.8256, lon: 87.6168 },
-  { id: 9, name: "Lahore", population: 11126000, distance_km: 5400, lat: 31.5204, lon: 74.3587 },
-  { id: 10, name: "New Delhi", population: 29399000, distance_km: 5800, lat: 28.6139, lon: 77.2090 },
-  { id: 11, name: "Dhaka", population: 21006000, distance_km: 6200, lat: 23.8103, lon: 90.4125 },
-  { id: 12, name: "Chennai", population: 10971000, distance_km: 6500, lat: 13.0827, lon: 80.2707 },
-  { id: 13, name: "Bangkok", population: 10539000, distance_km: 7200, lat: 13.7563, lon: 100.5018 },
-  { id: 14, name: "Jakarta", population: 10562000, distance_km: 8100, lat: -6.2088, lon: 106.8456 },
-  { id: 15, name: "Singapore", population: 5686000, distance_km: 8300, lat: 1.3521, lon: 103.8198 },
-  { id: 16, name: "Manila", population: 17801000, distance_km: 8700, lat: 14.5995, lon: 120.9842 },
-  { id: 17, name: "Tokyo", population: 37400000, distance_km: 9500, lat: 35.6762, lon: 139.6503 },
-  { id: 18, name: "Seoul", population: 9720000, distance_km: 9200, lat: 37.5665, lon: 126.9780 },
-  { id: 19, name: "Beijing", population: 21540000, distance_km: 8900, lat: 39.9042, lon: 116.4074 },
-  { id: 20, name: "Shanghai", population: 27058000, distance_km: 9000, lat: 31.2304, lon: 121.4737 }
-];
 
-// Mock API endpoint - returns dummy conurbations based on input coordinates
+  const φ2 = Math.asin(
-app.get('/api/line-of-sight', (req, res) => {
+    Math.sin(φ1) * Math.cos(δ) +
+      Math.cos(φ1) * Math.sin(δ) * Math.cos(brng)
+  );
+  const λ2 =
+    λ1 +
+    Math.atan2(
+      Math.sin(brng) * Math.sin(δ) * Math.cos(φ1),
+      Math.cos(δ) - Math.sin(φ1) * Math.sin(φ2)
+    );
+
+  return {
+    lat: (φ2 * 180) / Math.PI,
+    lon: (((λ2 * 180) / Math.PI + 540) % 360) - 180
+  };
+};
+
+const haversineKm = (lat1, lon1, lat2, lon2) => {
+  const R = 6371;
+  const toRad = (d) => d * Math.PI / 180;
+  const dLat = toRad(lat2 - lat1);
+  const dLon = toRad(lon2 - lon1);
+  const a = Math.sin(dLat / 2) ** 2 + Math.cos(toRad(lat1)) * Math.cos(toRad(lat2)) * Math.sin(dLon / 2) ** 2;
+  return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+};
+
+app.get('/api/line-of-sight', async (req, res) => {
   const { lat, lon, direction, tolerance } = req.query;
 
-  console.log(`Received request: lat=${lat}, lon=${lon}, direction=${direction}, tolerance=${tolerance}`);
+  const startLat = parseFloat(lat) || 51.5074;
+  const startLon = parseFloat(lon) || -0.1278;
+  const bearing = parseInt(direction) || 0;
+  const toleranceKm = parseInt(tolerance) || 50;
+
+  console.log(`Processing request: lat=${startLat}, lon=${startLon}, bearing=${bearing}, tolerance=${toleranceKm}`);
+
+  try {
+    const pathPoints = [];
+    const totalDistance = 40074;
+    const steps = 160;
+
+    for (let i = 0; i <= steps; i++) {
+      const dist = (totalDistance * i) / steps;
+      pathPoints.push(calculateDestination(startLat, startLon, bearing, dist));
+    }
+
+    // Bulk land check: use a single query for all points to avoid connection pool exhaustion
+    const waterStart = Date.now();
+    const lons = pathPoints.map(p => p.lon);
+    const lats = pathPoints.map(p => p.lat);
+
+    const waterCheckQuery = `
+      WITH points AS (
+        SELECT i, ST_SetSRID(ST_MakePoint(lon, lat), 4326)::geography as p_geom
+        FROM unnest($1::float8[], $2::float8[]) WITH ORDINALITY AS t(lon, lat, i)
+      )
+      SELECT i, EXISTS (
+        SELECT 1 FROM cities 
+        WHERE ST_DWithin(geom, p_geom, 500000)
+        LIMIT 1
+      ) as has_land
+      FROM points
+      ORDER BY i;
+    `;
+    
+    const waterResults = await pool.query(waterCheckQuery, [lons, lats]);
+    const waterChecks = waterResults.rows.map(r => !r.has_land);
+    
+    console.log(`Bulk water check completed in ${Date.now() - waterStart}ms for ${pathPoints.length} points.`);
+
+    const pathPointsWithWater = pathPoints.map((p, i) => ({
+      ...p,
+      is_over_water: waterChecks[i]
+    }));
+
+    const lineWKT = `LINESTRING(${pathPoints.map(p => `${p.lon} ${p.lat}`).join(',')})`;
+
+    // Top 5 cities per 100 km bin, ranked by population descending
+    const query = `
+      WITH path AS (
+        SELECT ST_GeogFromText($1) as route,
+               ST_MakePoint($3, $4)::geography as start_node
+      ),
+      candidates AS (
+        SELECT
+          id, name, population, country,
+          ST_Y(geom::geometry) as lat,
+          ST_X(geom::geometry) as lon,
+          ST_Distance(geom, (SELECT route FROM path)) / 1000 as distance_off_line_km,
+          ST_Distance(geom, (SELECT start_node FROM path)) / 1000 as distance_from_start_km,
+          ST_LineLocatePoint((SELECT route FROM path)::geography::geometry, geom::geometry) as pos_on_line,
+          FLOOR(ST_LineLocatePoint((SELECT route FROM path)::geography::geometry, geom::geometry) * 200)::int as bin_200km
+        FROM cities
+        WHERE ST_DWithin(geom, (SELECT route FROM path), $2 * 1000)
+      ),
+      ranked AS (
+        SELECT *,
+          ROW_NUMBER() OVER (PARTITION BY bin_200km ORDER BY population DESC NULLS LAST) as rank_in_bin
+        FROM candidates
+      )
+      SELECT id, name, population, country, lat, lon,
+             distance_off_line_km, distance_from_start_km, pos_on_line
+      FROM ranked
+      WHERE rank_in_bin <= 10
+      ORDER BY pos_on_line ASC;
+    `;
+
+    const startTime = Date.now();
+    const result = await pool.query(query, [lineWKT, toleranceKm, startLon, startLat]);
+    const queryTime = Date.now() - startTime;
+    console.log(`Query completed in ${queryTime}ms. Found ${result.rows.length} candidates.`);
+
+    const startDedupe = Date.now();
+    // Greedy dynamic deduplication...
+    const byPopulation = [...result.rows].sort((a, b) => (b.population || 0) - (a.population || 0));
+    const accepted = [];
+    for (const city of byPopulation) {
+      const cityPop = city.population || 0;
+      const tooClose = accepted.some(s => {
+        const dist = haversineKm(s.lat, s.lon, city.lat, city.lon);
+        const sPop = s.population || 0;
+        if (cityPop > 1000000 && sPop > 1000000) return dist < 30;
+        if (cityPop > 100000 || sPop > 100000) return dist < 50;
+        return dist < 80;
+      });
+      if (!tooClose) accepted.push(city);
+    }
+    accepted.sort((a, b) => a.pos_on_line - b.pos_on_line);
+    console.log(`Deduplication completed in ${Date.now() - startDedupe}ms. Final count: ${accepted.length}`);
 
-  // Return mock data for MVP
     res.json({
       success: true,
       data: {
-      start_point: { lat: parseFloat(lat) || 51.5074, lon: parseFloat(lon) || -0.1278 },
+        start_point: { lat: startLat, lon: startLon },
-      direction: parseInt(direction) || 45,
+        direction: bearing,
-      tolerance_km: parseInt(tolerance) || 50,
+        tolerance_km: toleranceKm,
-      conurbations: MOCK_CONURBATIONS.slice(0, 20),
+        conurbations: accepted.map(row => ({
-      line_coordinates: [
+          ...row,
-        { lat: 51.5074, lon: -0.1278 },
+          name: row.name || 'Unknown',
-        { lat: 48.8566, lon: 2.3522 },
+          country: row.country || 'Unknown',
-        { lat: 52.5200, lon: 13.4050 },
+          distance_km: Math.round(row.distance_from_start_km),
-        { lat: 55.7558, lon: 37.6173 },
+          off_line_km: Math.round(row.distance_off_line_km)
-        { lat: 43.2220, lon: 76.8512 },
+        })),
-        { lat: 28.6139, lon: 77.2090 },
+        line_coordinates: pathPointsWithWater
-        { lat: 13.7563, lon: 100.5018 },
+      }
-        { lat: -6.2088, lon: 106.8456 },
-        { lat: 35.6762, lon: 139.6503 },
-        { lat: 51.5074, lon: -0.1278 } // Complete the circle
-      ]
-    },
-    message: "Mock data returned for MVP - Real geospatial calculations coming soon"
     });
+    console.log(`Request fully processed in ${Date.now() - startTime}ms`);
+  } catch (err) {
+    console.error('Database query error:', err);
+    res.status(500).json({ success: false, error: 'Database query failed' });
+  }
 });
 
-// Health check endpoint
 app.get('/api/health', (req, res) => {
   res.json({ status: 'ok', timestamp: new Date().toISOString() });
 });
 
-app.listen(PORT, '0.0.0.0', () => {
+if (require.main === module) {
+  app.listen(PORT, '0.0.0.0', () => {
     console.log(`Line of Sight Backend running on port ${PORT}`);
-});
+  });
+}
+
+module.exports = { app, calculateDestination };

backend/package-lock.json

@@ -8,6 +8,7 @@
       "name": "line-of-sight-backend",
       "version": "1.0.0",
       "dependencies": {
+        "axios": "^1.13.6",
         "cors": "^2.8.6",
         "dotenv": "^17.3.1",
         "express": "^5.2.1",
@@ -15,7 +16,8 @@
       },
       "devDependencies": {
         "jest": "^30.3.0",
-        "nodemon": "^3.1.14"
+        "nodemon": "^3.1.14",
+        "supertest": "^7.2.2"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -931,6 +933,27 @@
         "@tybys/wasm-util": "^0.10.0"
       }
     },
+    "node_modules/@noble/hashes": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.8.0.tgz",
+      "integrity": "sha512-jCs9ldd7NwzpgXDIf6P3+NrHh9/sD6CQdxHyjQI+h/6rDNo88ypBxxz45UDuZHz9r3tNz7N/VInSVoVdtXEI4A==",
+      "dev": true,
+      "engines": {
+        "node": "^14.21.3 || >=16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@paralleldrive/cuid2": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/@paralleldrive/cuid2/-/cuid2-2.3.1.tgz",
+      "integrity": "sha512-XO7cAxhnTZl0Yggq6jOgjiOHhbgcO4NqFqwSmQpjK3b6TEE6Uj/jfSk6wzYyemh3+I0sHirKSetjQwn5cZktFw==",
+      "dev": true,
+      "dependencies": {
+        "@noble/hashes": "^1.1.5"
+      }
+    },
     "node_modules/@pkgjs/parseargs": {
       "version": "0.11.0",
       "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
@@ -1426,6 +1449,29 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "node_modules/asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
+      "dev": true
+    },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "license": "MIT"
+    },
+    "node_modules/axios": {
+      "version": "1.13.6",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.13.6.tgz",
+      "integrity": "sha512-ChTCHMouEe2kn713WHbQGcuYrr6fXTBiu460OTwWrWob16g1bXn4vtz07Ope7ewMozJAnEquLk5lWQWtBig9DQ==",
+      "license": "MIT",
+      "dependencies": {
+        "follow-redirects": "^1.15.11",
+        "form-data": "^4.0.5",
+        "proxy-from-env": "^1.1.0"
+      }
+    },
     "node_modules/babel-jest": {
       "version": "30.3.0",
       "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-30.3.0.tgz",
@@ -1891,6 +1937,27 @@
       "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
       "dev": true
     },
+    "node_modules/combined-stream": {
+      "version": "1.0.8",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+      "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+      "license": "MIT",
+      "dependencies": {
+        "delayed-stream": "~1.0.0"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/component-emitter": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.1.tgz",
+      "integrity": "sha512-T0+barUSQRTUQASh8bx02dl+DhF54GtIDY13Y3m9oWTklKbb3Wv974meRpeZ3lp1JpLVECWWNHC4vaG2XHXouQ==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -1939,6 +2006,12 @@
         "node": ">=6.6.0"
       }
     },
+    "node_modules/cookiejar": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.4.tgz",
+      "integrity": "sha512-LDx6oHrK+PhzLKJU9j5S7/Y3jM/mUHvD/DeI1WQmJn652iPC5Y4TBzC9l+5OMOXlyTTA+SmVUPm0HQUwpD5Jqw==",
+      "dev": true
+    },
     "node_modules/cors": {
       "version": "2.8.6",
       "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.6.tgz",
@@ -2008,6 +2081,15 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/delayed-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
+      "integrity": "sha512-ZySD7Nf91aLB0RxL4KGrKHBXl7Eds1DAmEdcoVawXnLD7SDhpNgtuII2aAkg7a7QS41jxPSZ17p4VdGnMHk3MQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.4.0"
+      }
+    },
     "node_modules/depd": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
@@ -2025,6 +2107,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/dezalgo": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/dezalgo/-/dezalgo-1.0.4.tgz",
+      "integrity": "sha512-rXSP0bf+5n0Qonsb+SVVfNfIsimO4HEtmnIpPHY8Q1UCzKlQrDMfdobr8nJOOsRgWCyMRqeSBQzmWUMq7zvVig==",
+      "dev": true,
+      "dependencies": {
+        "asap": "^2.0.0",
+        "wrappy": "1"
+      }
+    },
     "node_modules/dotenv": {
       "version": "17.3.1",
       "resolved": "https://registry.npmjs.org/dotenv/-/dotenv-17.3.1.tgz",
@@ -2128,6 +2220,21 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/es-set-tostringtag": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/es-set-tostringtag/-/es-set-tostringtag-2.1.0.tgz",
+      "integrity": "sha512-j6vWzfrGVfyXxge+O0x5sh6cvxAog0a/4Rdd2K36zCMV5eJ+/+tOAngRO8cODMNWbVRdVlmGZQL2YS3yR8bIUA==",
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.6",
+        "has-tostringtag": "^1.0.2",
+        "hasown": "^2.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
@@ -2275,6 +2382,12 @@
       "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==",
       "dev": true
     },
+    "node_modules/fast-safe-stringify": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/fast-safe-stringify/-/fast-safe-stringify-2.1.1.tgz",
+      "integrity": "sha512-W+KJc2dmILlPplD/H4K9l9LcAHAfPtP6BY84uVLXQ6Evcz9Lcg33Y2z1IVblT6xdY54PXYVHEv+0Wpq8Io6zkA==",
+      "dev": true
+    },
     "node_modules/fb-watchman": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/fb-watchman/-/fb-watchman-2.0.2.tgz",
@@ -2329,6 +2442,26 @@
         "node": ">=8"
       }
     },
+    "node_modules/follow-redirects": {
+      "version": "1.15.11",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.15.11.tgz",
+      "integrity": "sha512-deG2P0JfjrTxl50XGCDyfI97ZGVCxIpfKYmfyrQ54n5FO/0gfIES8C/Psl6kWVDolizcaaxZJnTS0QSMxvnsBQ==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://github.com/sponsors/RubenVerborgh"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=4.0"
+      },
+      "peerDependenciesMeta": {
+        "debug": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/foreground-child": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/foreground-child/-/foreground-child-3.3.1.tgz",
@@ -2345,6 +2478,60 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/form-data": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.5.tgz",
+      "integrity": "sha512-8RipRLol37bNs2bhoV67fiTEvdTrbMUYcFTiy3+wuuOnUog2QBHCZWXDRijWQfAkhBj2Uf5UnVaiWwA5vdd82w==",
+      "license": "MIT",
+      "dependencies": {
+        "asynckit": "^0.4.0",
+        "combined-stream": "^1.0.8",
+        "es-set-tostringtag": "^2.1.0",
+        "hasown": "^2.0.2",
+        "mime-types": "^2.1.12"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-db": {
+      "version": "1.52.0",
+      "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.52.0.tgz",
+      "integrity": "sha512-sPU4uV7dYlvtWJxwwxHD0PuihVNiE7TyAbQ5SWxDCB9mUYvOgroQOwYQQOKPJ8CIbE+1ETVlOoK1UC2nU3gYvg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/form-data/node_modules/mime-types": {
+      "version": "2.1.35",
+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.35.tgz",
+      "integrity": "sha512-ZDY+bPm5zTTF+YpCrAU9nK0UgICYPT0QtT1NZWFv4s++TNkcgVaT0g6+4R2uI4MjQjzysHB1zxuWL50hzaeXiw==",
+      "license": "MIT",
+      "dependencies": {
+        "mime-db": "1.52.0"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/formidable": {
+      "version": "3.5.4",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-3.5.4.tgz",
+      "integrity": "sha512-YikH+7CUTOtP44ZTnUhR7Ic2UASBPOqmaRkRKxRbywPTe5VxF7RRCck4af9wutiZ/QKM5nME9Bie2fFaPz5Gug==",
+      "dev": true,
+      "dependencies": {
+        "@paralleldrive/cuid2": "^2.2.2",
+        "dezalgo": "^1.0.4",
+        "once": "^1.4.0"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "funding": {
+        "url": "https://ko-fi.com/tunnckoCore/commissions"
+      }
+    },
     "node_modules/forwarded": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.2.0.tgz",
@@ -2533,6 +2720,21 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/has-tostringtag": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/has-tostringtag/-/has-tostringtag-1.0.2.tgz",
+      "integrity": "sha512-NqADB8VjPFLM2V0VvHUewwwsw0ZWBaIdgo+ieHtK3hasLz4qeCRjYcqfB6AQrBggRKppKF8L52/VqdVsO47Dlw==",
+      "license": "MIT",
+      "dependencies": {
+        "has-symbols": "^1.0.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/hasown": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.2.tgz",
@@ -3551,6 +3753,27 @@
       "integrity": "sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==",
       "dev": true
     },
+    "node_modules/methods": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
+      "integrity": "sha512-iclAHeNqNm68zFtnZ0e+1L2yUIdvzNoauKU4WBA3VvH/vPFieF7qfRlwUZU+DA9P9bPXIS90ulxoUoCH23sV2w==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/mime": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/mime/-/mime-2.6.0.tgz",
+      "integrity": "sha512-USPkMeET31rOMiarsBNIHZKLGgvKc/LrjofAnBlOttf5ajRvqiRA8QsenbcooctK6d6Ts6aqZXBA+XbkKthiQg==",
+      "dev": true,
+      "bin": {
+        "mime": "cli.js"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
     "node_modules/mime-db": {
       "version": "1.54.0",
       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.54.0.tgz",
@@ -4158,6 +4381,12 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/proxy-from-env": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
+      "integrity": "sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==",
+      "license": "MIT"
+    },
     "node_modules/pstree.remy": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/pstree.remy/-/pstree.remy-1.1.8.tgz",
@@ -4700,6 +4929,40 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/superagent": {
+      "version": "10.3.0",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-10.3.0.tgz",
+      "integrity": "sha512-B+4Ik7ROgVKrQsXTV0Jwp2u+PXYLSlqtDAhYnkkD+zn3yg8s/zjA2MeGayPoY/KICrbitwneDHrjSotxKL+0XQ==",
+      "dev": true,
+      "dependencies": {
+        "component-emitter": "^1.3.1",
+        "cookiejar": "^2.1.4",
+        "debug": "^4.3.7",
+        "fast-safe-stringify": "^2.1.1",
+        "form-data": "^4.0.5",
+        "formidable": "^3.5.4",
+        "methods": "^1.1.2",
+        "mime": "2.6.0",
+        "qs": "^6.14.1"
+      },
+      "engines": {
+        "node": ">=14.18.0"
+      }
+    },
+    "node_modules/supertest": {
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-7.2.2.tgz",
+      "integrity": "sha512-oK8WG9diS3DlhdUkcFn4tkNIiIbBx9lI2ClF8K+b2/m8Eyv47LSawxUzZQSNKUrVb2KsqeTDCcjAAVPYaSLVTA==",
+      "dev": true,
+      "dependencies": {
+        "cookie-signature": "^1.2.2",
+        "methods": "^1.1.2",
+        "superagent": "^10.3.0"
+      },
+      "engines": {
+        "node": ">=14.18.0"
+      }
+    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",

backend/package.json

@@ -6,16 +6,19 @@
   "scripts": {
     "start": "node app/server.js",
     "dev": "nodemon app/server.js",
-    "test": "jest"
+    "test": "jest",
+    "seed-data": "node scripts/import_cities.js"
   },
   "dependencies": {
-    "express": "^5.2.1",
+    "axios": "^1.13.6",
     "cors": "^2.8.6",
-    "pg": "^8.20.0",
+    "dotenv": "^17.3.1",
-    "dotenv": "^17.3.1"
+    "express": "^5.2.1",
+    "pg": "^8.20.0"
   },
   "devDependencies": {
+    "jest": "^30.3.0",
     "nodemon": "^3.1.14",
-    "jest": "^30.3.0"
+    "supertest": "^7.2.2"
   }
 }

backend/scripts/import_cities.js

@@ -0,0 +1,95 @@
+const { Pool } = require('pg');
+const { execSync } = require('child_process');
+const fs = require('fs');
+const readline = require('readline');
+require('dotenv').config();
+
+const DATA_URL = 'https://download.geonames.org/export/dump/cities5000.zip';
+const ZIP_FILE = '/tmp/cities.zip';
+const TXT_FILE = '/tmp/cities5000.txt';
+
+async function importGeoNames() {
+  const pool = new Pool({
+    connectionString: process.env.DATABASE_URL || 'postgresql://line_of_sight:line_of_sight_pass@postgres:5432/line_of_sight'
+  });
+
+  try {
+    console.log('Downloading GeoNames cities5000 (Pop > 5000)...');
+    execSync(`wget -q ${DATA_URL} -O ${ZIP_FILE}`);
+    
+    console.log('Extracting data...');
+    execSync(`unzip -o ${ZIP_FILE} -d /tmp`);
+
+    console.log('Connecting to database...');
+    const client = await pool.connect();
+
+    // Ensure table is clean
+    await client.query('TRUNCATE TABLE cities');
+
+    console.log('Starting stream import...');
+    
+    const fileStream = fs.createReadStream(TXT_FILE);
+    const rl = readline.createInterface({
+      input: fileStream,
+      crlfDelay: Infinity
+    });
+
+    let batch = [];
+    const batchSize = 500;
+    let count = 0;
+
+    for await (const line of rl) {
+      const parts = line.split('\t');
+      if (parts.length < 15) continue;
+
+      const name = parts[1]; // name
+      const lat = parseFloat(parts[4]);
+      const lon = parseFloat(parts[5]);
+      const country = parts[8]; // country code
+      const population = parseInt(parts[14]) || 0;
+
+      batch.push({ name, lat, lon, country, population });
+
+      if (batch.length >= batchSize) {
+        await insertBatch(client, batch);
+        count += batch.length;
+        if (count % 5000 === 0) console.log(`Imported ${count} cities...`);
+        batch = [];
+      }
+    }
+
+    if (batch.length > 0) {
+      await insertBatch(client, batch);
+      count += batch.length;
+    }
+
+    console.log(`SUCCESS: Imported ${count} cities and towns.`);
+    client.release();
+
+  } catch (err) {
+    console.error('ERROR during import:', err);
+  } finally {
+    // Cleanup
+    if (fs.existsSync(ZIP_FILE)) fs.unlinkSync(ZIP_FILE);
+    if (fs.existsSync(TXT_FILE)) fs.unlinkSync(TXT_FILE);
+    await pool.end();
+  }
+}
+
+async function insertBatch(client, batch) {
+  const queryParts = [];
+  const values = [];
+  
+  batch.forEach((city, index) => {
+    const base = index * 5;
+    queryParts.push(`($${base + 1}, $${base + 2}, $${base + 3}, ST_SetSRID(ST_MakePoint($${base + 4}, $${base + 5}), 4326)::geography)`);
+    values.push(city.name, city.population, city.country, city.lon, city.lat);
+  });
+
+  await client.query(
+    `INSERT INTO cities (name, population, country, geom) VALUES ${queryParts.join(',')}`,
+    values
+  );
+}
+
+importGeoNames();

backend/tests/server.test.js

@@ -1,42 +1,74 @@
-/**
+const request = require('supertest');
- * Placeholder test file for Line of Sight Backend
+const { app, calculateDestination } = require('../app/server');
- * 
+
- * TODO: Add real tests for:
+// Mock pg Pool
- * - API endpoint validation
+jest.mock('pg', () => {
- * - Geospatial calculations
+  const mPool = {
- * - Database queries
+    query: jest.fn(),
- * - Error handling
+    on: jest.fn(),
- */
+    end: jest.fn(),
+  };
+  return { Pool: jest.fn(() => mPool) };
+});
+
+const { Pool } = require('pg');
+const pool = new Pool();
 
 describe('Line of Sight Backend', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('calculateDestination', () => {
+    test('should calculate correct destination for North (0 degrees)', () => {
+      const start = { lat: 0, lon: 0 };
+      const dest = calculateDestination(start.lat, start.lon, 0, 111.12); // ~1 degree North
+      expect(dest.lat).toBeCloseTo(1, 1);
+      expect(dest.lon).toBeCloseTo(0, 1);
+    });
+
+    test('should calculate correct destination for East (90 degrees)', () => {
+      const start = { lat: 0, lon: 0 };
+      const dest = calculateDestination(start.lat, start.lon, 90, 111.12); // ~1 degree East at equator
+      expect(dest.lat).toBeCloseTo(0, 1);
+      expect(dest.lon).toBeCloseTo(1, 1);
+    });
+  });
+
   describe('GET /api/health', () => {
-    test('should return 200 OK', () => {
+    test('should return 200 OK', async () => {
-      // TODO: Implement health check test
+      const response = await request(app).get('/api/health');
-      expect(true).toBe(true);
+      expect(response.status).toBe(200);
+      expect(response.body.status).toBe('ok');
     });
   });
 
   describe('GET /api/line-of-sight', () => {
-    test('should return valid response structure', () => {
+    test('should return valid response structure', async () => {
-      // TODO: Implement line of sight API test
+      // Mock the water checks and the main city query
-      expect(true).toBe(true);
+      pool.query
+        .mockResolvedValueOnce({ rows: [{ has_land: true }] }) // Simplified for tests, it actually calls many times
+        .mockResolvedValue({ rows: [{ id: 1, name: 'London', population: 9000000, country: 'GB', lat: 51.5, lon: -0.1, distance_off_line_km: 0, distance_from_start_km: 0, pos_on_line: 0 }] });
+
+      const response = await request(app)
+        .get('/api/line-of-sight')
+        .query({ lat: 51.5, lon: -0.1, direction: 45, tolerance: 50 });
+
+      expect(response.status).toBe(200);
+      expect(response.body.success).toBe(true);
+      expect(response.body.data.conurbations).toBeDefined();
+      expect(response.body.data.line_coordinates).toBeDefined();
     });
 
-    test('should handle missing parameters', () => {
+    test('should handle database errors', async () => {
-      // TODO: Implement error handling test
+      pool.query.mockRejectedValue(new Error('DB Error'));
-      expect(true).toBe(true);
-    });
-  });
 
-  describe('Geospatial Calculations', () => {
+      const response = await request(app)
-    test('should calculate great circle path', () => {
+        .get('/api/line-of-sight')
-      // TODO: Implement geospatial calculation tests
+        .query({ lat: 51.5, lon: -0.1, direction: 45, tolerance: 50 });
-      expect(true).toBe(true);
-    });
 
-    test('should filter cities within tolerance', () => {
+      expect(response.status).toBe(500);
-      // TODO: Implement tolerance filtering tests
+      expect(response.body.success).toBe(false);
-      expect(true).toBe(true);
     });
   });
 });

docker-compose.yml

@@ -1,17 +1,11 @@
-version: '3.8'
-
 services:
   postgres:
     image: kartoza/postgis:latest
-    platform: linux/arm64
     container_name: line-of-sight-db
     environment:
       - POSTGRES_DB=line_of_sight
       - POSTGRES_USER=line_of_sight
       - POSTGRES_PASS=line_of_sight_pass
-      - ALLOW_IP_RANGE=0.0.0.0/0
-    ports:
-      - "5432:5432"
     volumes:
       - pgdata:/var/lib/postgresql
       - ./docker/init.sql:/docker-entrypoint-initdb.d/init.sql
@@ -26,11 +20,12 @@ services:
       context: ./backend
       dockerfile: Dockerfile
     container_name: line-of-sight-backend
-    ports:
+    # Removed public port exposure for security; accessible via frontend proxy
-      - "3001:3001"
+    # ports:
+    #   - "3051:3051"
     environment:
       - DATABASE_URL=postgresql://line_of_sight:line_of_sight_pass@postgres:5432/line_of_sight
-      - PORT=3001
+      - PORT=3051
     depends_on:
       postgres:
         condition: service_healthy
@@ -44,9 +39,9 @@ services:
       dockerfile: Dockerfile
     container_name: line-of-sight-frontend
     ports:
-      - "3000:3000"
+      - "3050:3050"
     environment:
-      - VITE_API_URL=http://localhost:3001/api
+      - VITE_API_URL=/api
     depends_on:
       - backend
     volumes:

frontend/Dockerfile

@@ -10,10 +10,10 @@ RUN npm install
 COPY . .
 
 # Expose port
-EXPOSE 3000
+EXPOSE 3050
 
-# Set environment variable for API URL
+# Set environment variable for API URL (relative to the frontend host)
-ENV VITE_API_URL=http://localhost:3001/api
+ENV VITE_API_URL=/api
 
 # Start development server
 CMD ["npm", "start"]

frontend/e2e/app.spec.js

@@ -0,0 +1,107 @@
+import { test, expect } from '@playwright/test';
+
+// MapLibre GL requires WebGL which isn't available in headless Chromium.
+// Intercept the module request and return a lightweight mock so React can render.
+const MAPLIBRE_MOCK = `
+class Map {
+  constructor(opts) {
+    this._listeners = {};
+    Promise.resolve().then(() => this._emit('style.load'));
+  }
+  _emit(event) {
+    (this._listeners[event] || []).forEach(fn => fn());
+  }
+  on(event, fn) {
+    if (!this._listeners[event]) this._listeners[event] = [];
+    this._listeners[event].push(fn);
+    return this;
+  }
+  off(event, fn) {
+    this._listeners[event] = (this._listeners[event] || []).filter(l => l !== fn);
+    return this;
+  }
+  remove() {}
+  getSource() { return null; }
+  getLayer() { return null; }
+  addSource() {}
+  addLayer() {}
+  removeLayer() {}
+  removeSource() {}
+  setSky() {}
+  setTerrain() {}
+  setLayoutProperty() {}
+  flyTo() {}
+  jumpTo() {}
+  setStyle() { Promise.resolve().then(() => this._emit('style.load')); }
+  setProjection() {}
+  hasImage() { return false; }
+  addImage() {}
+  getCanvas() { return document.createElement('canvas'); }
+  project() { return { x: 0, y: 0 }; }
+  unproject() { return { lng: 0, lat: 0 }; }
+}
+class Marker {
+  constructor(opts) {
+    this._el = (opts && opts.element) || document.createElement('div');
+  }
+  setLngLat() { return this; }
+  addTo() { return this; }
+  remove() {}
+  getLngLat() { return { lng: 0, lat: 0 }; }
+  getElement() { return this._el; }
+}
+class Popup {
+  setLngLat() { return this; }
+  setDOMContent() { return this; }
+  addTo() { return this; }
+  remove() {}
+}
+class LngLatBounds {
+  extend() { return this; }
+}
+export default { Map, Marker, Popup, LngLatBounds };
+`;
+
+test.beforeEach(async ({ page }) => {
+  await page.route('**maplibre-gl.js*', async route => {
+    await route.fulfill({ contentType: 'application/javascript', body: MAPLIBRE_MOCK });
+  });
+});
+
+test.describe('Line of Sight Application', () => {
+  test('should load the home page and show settings', async ({ page }) => {
+    await page.goto('/');
+    await expect(page.locator('text=Line of Sight Settings')).toBeVisible();
+    await expect(page.locator('label:has-text("Direction")')).toBeVisible();
+  });
+
+  test('should be able to toggle map style', async ({ page }) => {
+    await page.goto('/');
+    await page.waitForSelector('h3:text("Line of Sight Settings")', { timeout: 10000 });
+    const darkButton = page.locator('button:text("Dark")');
+    await darkButton.click();
+    await expect(darkButton).toHaveClass(/active-style/);
+  });
+
+  test('should show results when clicking the search button', async ({ page }) => {
+    await page.goto('/');
+    await page.waitForSelector('h3:text("Line of Sight Settings")', { timeout: 10000 });
+
+    await page.route('**/api/line-of-sight*', async route => {
+      const json = {
+        success: true,
+        data: {
+          conurbations: [
+            { id: 1, name: 'Test City', population: 100000, country: 'TS', lat: 0, lon: 0, distance_km: 10, off_line_km: 1 }
+          ],
+          line_coordinates: [{ lat: 0, lon: 0 }, { lat: 1, lon: 1 }]
+        }
+      };
+      await route.fulfill({ json });
+    });
+
+    await page.click('button:text("Show Line of Sight")');
+    await expect(page.locator('text=Conurbations Found')).toBeVisible();
+    await expect(page.locator('text=Test City')).toBeVisible();
+  });
+});

frontend/package.json

@@ -3,16 +3,18 @@
   "version": "1.0.0",
   "private": true,
   "dependencies": {
+    "@turf/turf": "^7.3.4",
     "axios": "^1.7.9",
     "maplibre-gl": "^5.20.1",
     "react": "^19.2.1",
     "react-dom": "^19.2.1"
   },
   "devDependencies": {
+    "@playwright/test": "^1.58.2",
     "@testing-library/jest-dom": "^6.6.0",
     "@testing-library/react": "^16.1.0",
     "@vitejs/plugin-react": "^4.3.0",
-    "jsdom": "^29.0.0",
+    "happy-dom": "^20.8.4",
     "vite": "^6.0.0",
     "vitest": "^3.0.0"
   },
@@ -20,7 +22,8 @@
     "start": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "test": "vitest"
+    "test": "vitest",
+    "test:e2e": "playwright test"
   },
   "browserslist": {
     "production": [

frontend/playwright-report/index.html

@@ -0,0 +1,85 @@
+
+
+<!DOCTYPE html>
+<html style='scrollbar-gutter: stable both-edges;'>
+  <head>
+    <meta charset='UTF-8'>
+    <meta name='color-scheme' content='dark light'>
+    <meta name='viewport' content='width=device-width, initial-scale=1.0'>
+    <title>Playwright Test Report</title>
+    <script type="module">var NA=Object.defineProperty;var BA=(l,u,c)=>u in l?NA(l,u,{enumerable:!0,configurable:!0,writable:!0,value:c}):l[u]=c;var yn=(l,u,c)=>BA(l,typeof u!="symbol"?u+"":u,c);(function(){const u=document.createElement("link").relList;if(u&&u.supports&&u.supports("modulepreload"))return;for(const r of document.querySelectorAll('link[rel="modulepreload"]'))f(r);new MutationObserver(r=>{for(const o of r)if(o.type==="childList")for(const h of o.addedNodes)h.tagName==="LINK"&&h.rel==="modulepreload"&&f(h)}).observe(document,{childList:!0,subtree:!0});function c(r){const o={};return r.integrity&&(o.integrity=r.integrity),r.referrerPolicy&&(o.referrerPolicy=r.referrerPolicy),r.crossOrigin==="use-credentials"?o.credentials="include":r.crossOrigin==="anonymous"?o.credentials="omit":o.credentials="same-origin",o}function f(r){if(r.ep)return;r.ep=!0;const o=c(r);fetch(r.href,o)}})();function UA(l){return l&&l.__esModule&&Object.prototype.hasOwnProperty.call(l,"default")?l.default:l}var Mf={exports:{}},Ei={};/**
+ * @license React
+ * react-jsx-runtime.production.js
+ *
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */var D1;function QA(){if(D1)return Ei;D1=1;var l=Symbol.for("react.transitional.element"),u=Symbol.for("react.fragment");function c(f,r,o){var h=null;if(o!==void 0&&(h=""+o),r.key!==void 0&&(h=""+r.key),"key"in r){o={};for(var v in r)v!=="key"&&(o[v]=r[v])}else o=r;return r=o.ref,{$$typeof:l,type:f,key:h,ref:r!==void 0?r:null,props:o}}return Ei.Fragment=u,Ei.jsx=c,Ei.jsxs=c,Ei}var M1;function zA(){return M1||(M1=1,Mf.exports=QA()),Mf.exports}var m=zA();const 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truncated
+ * @license React
+ * react.production.js
+ *
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */var T2;function B5(){if(T2)return dt;T2=1;var l=Symbol.for("react.transitional.element"),u=Symbol.for("react.portal"),c=Symbol.for("react.fragment"),f=Symbol.for("react.strict_mode"),r=Symbol.for("react.profiler"),o=Symbol.for("react.consumer"),h=Symbol.for("react.context"),v=Symbol.for("react.forward_ref"),y=Symbol.for("react.suspense"),A=Symbol.for("react.memo"),E=Symbol.for("react.lazy"),S=Symbol.for("react.activity"),O=Symbol.iterator;function X(C){return C===null||typeof C!="object"?null:(C=O&&C[O]||C["@@iterator"],typeof C=="function"?C:null)}var B={isMounted:function(){return!1},enqueueForceUpdate:function(){},enqueueReplaceState:function(){},enqueueSetState:function(){}},b=Object.assign,p={};function x(C,L,W){this.props=C,this.context=L,this.refs=p,this.updater=W||B}x.prototype.isReactComponent={},x.prototype.setState=function(C,L){if(typeof C!="object"&&typeof C!="function"&&C!=null)throw Error("takes an object of state variables to update or a function which returns an object of state variables.");this.updater.enqueueSetState(this,C,L,"setState")},x.prototype.forceUpdate=function(C){this.updater.enqueueForceUpdate(this,C,"forceUpdate")};function R(){}R.prototype=x.prototype;function U(C,L,W){this.props=C,this.context=L,this.refs=p,this.updater=W||B}var Z=U.prototype=new R;Z.constructor=U,b(Z,x.prototype),Z.isPureReactComponent=!0;var F=Array.isArray;function j(){}var D={H:null,A:null,T:null,S:null},N=Object.prototype.hasOwnProperty;function K(C,L,W){var et=W.ref;return{$$typeof:l,type:C,key:L,ref:et!==void 0?et:null,props:W}}function J(C,L){return K(C.type,L,C.props)}function k(C){return typeof C=="object"&&C!==null&&C.$$typeof===l}function nt(C){var L={"=":"=0",":":"=2"};return"$"+C.replace(/[=:]/g,function(W){return L[W]})}var P=/\/+/g;function st(C,L){return typeof C=="object"&&C!==null&&C.key!=null?nt(""+C.key):L.toString(36)}function it(C){switch(C.status){case"fulfilled":return C.value;case"rejected":throw C.reason;default:switch(typeof C.status=="string"?C.then(j,j):(C.status="pending",C.then(function(L){C.status==="pending"&&(C.status="fulfilled",C.value=L)},function(L){C.status==="pending"&&(C.status="rejected",C.reason=L)})),C.status){case"fulfilled":return C.value;case"rejected":throw C.reason}}throw C}function H(C,L,W,et,rt){var ot=typeof C;(ot==="undefined"||ot==="boolean")&&(C=null);var gt=!1;if(C===null)gt=!0;else switch(ot){case"bigint":case"string":case"number":gt=!0;break;case"object":switch(C.$$typeof){case l:case u:gt=!0;break;case E:return gt=C._init,H(gt(C._payload),L,W,et,rt)}}if(gt)return rt=rt(C),gt=et===""?"."+st(C,0):et,F(rt)?(W="",gt!=null&&(W=gt.replace(P,"$&/")+"/"),H(rt,L,W,"",function(On){return On})):rt!=null&&(k(rt)&&(rt=J(rt,W+(rt.key==null||C&&C.key===rt.key?"":(""+rt.key).replace(P,"$&/")+"/")+gt)),L.push(rt)),1;gt=0;var Ft=et===""?".":et+":";if(F(C))for(var Qt=0;Qt<C.length;Qt++)et=C[Qt],ot=Ft+st(et,Qt),gt+=H(et,L,W,ot,rt);else if(Qt=X(C),typeof Qt=="function")for(C=Qt.call(C),Qt=0;!(et=C.next()).done;)et=et.value,ot=Ft+st(et,Qt++),gt+=H(et,L,W,ot,rt);else if(ot==="object"){if(typeof C.then=="function")return H(it(C),L,W,et,rt);throw L=String(C),Error("Objects are not valid as a React child (found: "+(L==="[object Object]"?"object with keys {"+Object.keys(C).join(", ")+"}":L)+"). 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+# Instructions
+
+- Following Playwright test failed.
+- Explain why, be concise, respect Playwright best practices.
+- Provide a snippet of code with the fix, if possible.
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+<script id="playwrightReportBase64" type="application/zip">data:application/zip;base64,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</script>

frontend/playwright.config.js

@@ -0,0 +1,34 @@
+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './e2e',
+  fullyParallel: true,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: process.env.CI ? 1 : undefined,
+  reporter: process.env.CI ? 'list' : 'html',
+  use: {
+    baseURL: 'http://localhost:3050',
+    trace: 'on-first-retry',
+    headless: true,
+    launchOptions: {
+      args: [
+        '--enable-webgl',
+        '--ignore-gpu-blocklist',
+        '--use-gl=angle',
+        '--use-angle=swiftshader-webgl',
+      ],
+    },
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+  webServer: {
+    command: 'npm run start',
+    url: 'http://localhost:3050',
+    reuseExistingServer: !process.env.CI,
+  },
+});

frontend/src/__tests__/App.test.jsx

@@ -1,53 +1,112 @@
-/**
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
- * Placeholder test file for Line of Sight Frontend
+import { vi, describe, test, expect, beforeEach } from 'vitest';
- * 
+import App from '../App';
- * TODO: Add real tests for:
+import apiService from '../services/api';
- * - Map component rendering
- * - Direction selector functionality
- * - API integration
- * - User interactions
- * - Line of sight visualization
- */
 
-describe('Line of Sight Frontend', () => {
+// Mock MapLibre GL
-  describe('App Component', () => {
+vi.mock('maplibre-gl', () => {
-    test('should render map container', () => {
+  const mInstance = {
-      // TODO: Implement component rendering test
+    on: vi.fn(),
-      expect(true).toBe(true);
+    off: vi.fn(),
+    remove: vi.fn(),
+    addSource: vi.fn(),
+    removeSource: vi.fn(),
+    addLayer: vi.fn(),
+    removeLayer: vi.fn(),
+    getSource: vi.fn(() => ({ setData: vi.fn() })),
+    getLayer: vi.fn(),
+    setLayoutProperty: vi.fn(),
+    setStyle: vi.fn(),
+    flyTo: vi.fn(),
+    jumpTo: vi.fn(),
+    fitBounds: vi.fn(),
+    isStyleLoaded: vi.fn(() => true),
+    setSky: vi.fn(),
+    setTerrain: vi.fn(),
+    setProjection: vi.fn(),
+    hasImage: vi.fn(() => false),
+    addImage: vi.fn(),
+  };
+  
+  return {
+    default: {
+      Map: vi.fn(() => mInstance),
+      Marker: vi.fn(() => ({
+        setLngLat: vi.fn().mockReturnThis(),
+        addTo: vi.fn().mockReturnThis(),
+        remove: vi.fn().mockReturnThis(),
+        getElement: vi.fn(() => {
+          const el = document.createElement('div');
+          // Add a simple way to trigger click for tests if needed
+          return el;
+        }),
+      })),
+      Popup: vi.fn(() => ({
+        setLngLat: vi.fn().mockReturnThis(),
+        setDOMContent: vi.fn().mockReturnThis(),
+        addTo: vi.fn().mockReturnThis(),
+        remove: vi.fn().mockReturnThis(),
+        on: vi.fn().mockReturnThis(),
+      })),
+      LngLatBounds: vi.fn(() => ({
+        extend: vi.fn().mockReturnThis(),
+      })),
+      MercatorCoordinate: {
+        fromLngLat: vi.fn(() => ({ x: 0, y: 0, z: 0 })),
+      }
+    }
+  };
+});
+
+// Mock apiService
+vi.mock('../services/api', () => ({
+  default: {
+    getLineOfSight: vi.fn(),
+    healthCheck: vi.fn(),
+  }
+}));
+
+describe('App Component', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
   });
 
-    test('should display direction selector', () => {
+  test('renders the application title', () => {
-      // TODO: Implement direction selector test
+    render(<App />);
-      expect(true).toBe(true);
+    expect(screen.getByText(/Line of Sight Settings/i)).toBeInTheDocument();
   });
 
-    test('should handle map click events', () => {
+  test('renders initial controls', () => {
-      // TODO: Implement click event test
+    render(<App />);
-      expect(true).toBe(true);
+    // Use role or more specific text to avoid duplicates
+    expect(screen.getByText(/Direction \(0-360°\):/i)).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: /Show Line of Sight/i })).toBeInTheDocument();
+  });
+
+  test('calls API when clicking "Show Line of Sight"', async () => {
+    apiService.getLineOfSight.mockResolvedValue({
+      data: {
+        success: true,
+        data: {
+          conurbations: [],
+          line_coordinates: [{ lat: 0, lon: 0 }]
+        }
+      }
+    });
+
+    render(<App />);
+    const button = screen.getByRole('button', { name: /Show Line of Sight/i });
+    fireEvent.click(button);
+
+    await waitFor(() => {
+      expect(apiService.getLineOfSight).toHaveBeenCalled();
     });
   });
 
-  describe('API Integration', () => {
+  test('toggles map style', () => {
-    test('should fetch line of sight data', () => {
+    render(<App />);
-      // TODO: Implement API fetch test
+    const darkButton = screen.getByRole('button', { name: /Dark/i });
-      expect(true).toBe(true);
+    fireEvent.click(darkButton);
-    });
+    expect(darkButton).toHaveClass('active-style');
-
-    test('should handle API errors gracefully', () => {
-      // TODO: Implement error handling test
-      expect(true).toBe(true);
-    });
-  });
-
-  describe('UI Components', () => {
-    test('should toggle map style between light/dark', () => {
-      // TODO: Implement style toggle test
-      expect(true).toBe(true);
-    });
-
-    test('should display conurbation results table', () => {
-      // TODO: Implement results table test
-      expect(true).toBe(true);
-    });
   });
 });

frontend/src/services/api.js

@@ -1,13 +1,10 @@
 import axios from 'axios';
 
-const API_BASE_URL = import.meta.env.VITE_API_URL || 'http://localhost:3001/api';
+const API_BASE_URL = import.meta.env.VITE_API_URL || '/api';
 
 const api = axios.create({
   baseURL: API_BASE_URL,
-  timeout: 10000,
+  timeout: 30000
-  headers: {
-    'Content-Type': 'application/json'
-  }
 });
 
 export const getLineOfSight = async (lat, lon, direction, tolerance) => {

frontend/src/setupTests.js

@@ -0,0 +1,4 @@
+import '@testing-library/jest-dom';
+import { vi } from 'vitest';
+
+// Global mocks if needed

frontend/src/styles/App.css

@@ -3,6 +3,7 @@
   height: 100vh;
   width: 100vw;
   overflow: hidden;
+  position: relative;
 }
 
 .map-container {
@@ -12,6 +13,30 @@
   z-index: 1;
 }
 
+.locate-btn {
+  position: absolute;
+  top: 10px;
+  left: 10px;
+  z-index: 10;
+  width: 36px;
+  height: 36px;
+  background: white;
+  border: none;
+  border-radius: 4px;
+  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #333;
+  transition: background 0.15s, color 0.15s;
+}
+
+.locate-btn:hover {
+  background: #f0f0f0;
+  color: #1a73e8;
+}
+
 .controls {
   width: 350px;
   background: white;
@@ -19,6 +44,7 @@
   box-shadow: -2px 0 10px rgba(0,0,0,0.1);
   overflow-y: auto;
   z-index: 2;
+  position: relative;
 }
 
 .control-group {
@@ -62,6 +88,7 @@
 .setting-row span {
   font-weight: bold;
   color: #2c3e50;
+  min-width: 40px;
 }
 
 .setting-row button {
@@ -78,6 +105,12 @@
   background: #e9ecef;
 }
 
+.setting-row button.active-style {
+  background: #34495e;
+  color: white;
+  border-color: #2c3e50;
+}
+
 .action-btn {
   width: 100%;
   padding: 12px;
@@ -101,44 +134,193 @@
   cursor: not-allowed;
 }
 
+.action-btn-secondary {
+  width: 100%;
+  padding: 12px;
+  background: #34495e;
+  color: white;
+  border: none;
+  border-radius: 6px;
+  font-size: 16px;
+  font-weight: bold;
+  cursor: pointer;
+  transition: background 0.3s;
+  margin-top: 10px;
+}
+
+.action-btn-secondary:hover {
+  background: #2c3e50;
+}
+
+.disabled-controls {
+  opacity: 0.8;
+}
+
+.disabled-controls input {
+  pointer-events: none;
+  cursor: not-allowed;
+}
+
+/* Allow action buttons and settings buttons to work even when locked */
+.action-btn, .action-btn-secondary, .setting-row button {
+  pointer-events: auto !important;
+}
+
+.results-panel table thead {
+  position: sticky;
+  top: 0;
+  z-index: 1;
+}
+
 .results-panel {
   background: #f8f9fa;
   padding: 15px;
   border-radius: 8px;
   margin-bottom: 20px;
+  max-height: 450px;
+  overflow-y: auto;
+  border: 1px solid #eee;
 }
 
 .results-panel h3 {
   margin-top: 0;
   color: #2c3e50;
   font-size: 16px;
-  margin-bottom: 15px;
+  margin-bottom: 5px;
+}
+
+.results-panel .hint {
+  font-size: 11px;
+  color: #7f8c8d;
+  margin-bottom: 10px;
+  font-style: italic;
 }
 
 .results-panel table {
   width: 100%;
   border-collapse: collapse;
   font-size: 13px;
+  table-layout: fixed;
 }
 
 .results-panel th {
   background: #34495e;
   color: white;
-  padding: 10px;
+  padding: 8px 4px;
   text-align: left;
 }
 
 .results-panel td {
-  padding: 8px;
+  padding: 8px 4px;
   border-bottom: 1px solid #ddd;
+  cursor: pointer;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.results-panel tr {
+  will-change: transform, background-color;
 }
 
 .results-panel tr:nth-child(even) {
-  background: #f8f9fa;
+  background: #fdfdfd;
 }
 
 .results-panel tr:hover {
-  background: #e9ecef;
+  background: #ecf0f1;
+}
+
+.results-panel tr.selected-row {
+  background: #d5e8d4 !important;
+  font-weight: bold;
+}
+
+.info-panel-modal {
+  position: absolute;
+  top: 20px;
+  left: 20px;
+  width: 280px;
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
+  z-index: 1000;
+  animation: slideIn 0.3s ease-out;
+}
+
+@keyframes slideIn {
+  from { opacity: 0; transform: translateX(-20px); }
+  to { opacity: 1; transform: translateX(0); }
+}
+
+.info-panel-content {
+  padding: 20px;
+  position: relative;
+}
+
+.info-panel-content h2 {
+  margin-top: 0;
+  margin-bottom: 15px;
+  font-size: 18px;
+  color: #2c3e50;
+  border-bottom: 2px solid #4CAF50;
+  padding-bottom: 8px;
+}
+
+.close-btn {
+  position: absolute;
+  top: 10px;
+  right: 10px;
+  background: none;
+  border: none;
+  font-size: 24px;
+  cursor: pointer;
+  color: #95a5a6;
+}
+
+.close-btn:hover {
+  color: #34495e;
+}
+
+.info-grid {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+  margin-bottom: 20px;
+}
+
+.info-item {
+  display: flex;
+  flex-direction: column;
+}
+
+.info-item label {
+  font-size: 11px;
+  color: #7f8c8d;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
+.info-item span {
+  font-size: 14px;
+  color: #2c3e50;
+  font-weight: 500;
+}
+
+.action-btn-small {
+  width: 100%;
+  padding: 8px;
+  background: #3498db;
+  color: white;
+  border: none;
+  border-radius: 4px;
+  font-size: 14px;
+  cursor: pointer;
+  transition: background 0.2s;
+}
+
+.action-btn-small:hover {
+  background: #2980b9;
 }
 
 .more-info {
@@ -172,41 +354,67 @@
   margin-bottom: 8px;
 }
 
-.city-marker {
+.map-info-popup {
-  display: flex;
+  padding: 5px;
-  flex-direction: column;
-  align-items: center;
   font-family: sans-serif;
 }
 
-.marker-dot {
+.popup-header {
-  width: 12px;
+  border-bottom: 1px solid #eee;
-  height: 12px;
+  padding-bottom: 5px;
-  background: #e74c3c;
+  margin-bottom: 5px;
-  border: 2px solid white;
+  color: #2c3e50;
-  border-radius: 50%;
+  font-size: 14px;
-  box-shadow: 0 2px 4px rgba(0,0,0,0.3);
 }
 
-.marker-label {
+.popup-body {
-  background: white;
+  font-size: 12px;
+  color: #666;
+}
+
+.popup-body p {
+  margin: 3px 0;
+}
+
+.maplibregl-popup {
+  z-index: 2000 !important;
+}
+
+.maplibregl-popup-content {
+  border-radius: 8px !important;
+  box-shadow: 0 4px 15px rgba(0,0,0,0.3) !important;
+  padding: 15px !important;
+}
+
+.projection-row {
+  align-items: flex-start;
+}
+
+.projection-buttons {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 4px;
+  flex: 2;
+}
+
+.projection-buttons button {
   padding: 4px 8px;
-  border-radius: 4px;
   font-size: 11px;
-  font-weight: bold;
+  border: 1px solid #ddd;
-  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
+  background: white;
-  margin-top: 2px;
+  border-radius: 4px;
-  white-space: nowrap;
+  cursor: pointer;
+  transition: all 0.2s;
 }
 
-.marker-pop {
+.projection-buttons button:hover {
+  background: #e9ecef;
+}
+
+.projection-buttons button.active-style {
   background: #34495e;
   color: white;
-  padding: 2px 6px;
+  border-color: #2c3e50;
-  border-radius: 4px;
-  font-size: 10px;
-  margin-top: 2px;
-  white-space: nowrap;
 }
 
 @media (max-width: 768px) {
@@ -223,4 +431,107 @@
   .map-container {
     height: 60vh;
   }
+
+  .info-panel-modal {
+    left: 10px;
+    right: 10px;
+    width: auto;
+    bottom: 20px;
+    top: auto;
+  }
+}
+
+.results-panel tr.passed-row {
+  opacity: 0.4;
+}
+
+.results-panel tr.current-row {
+  background: #1abc9c !important;
+  color: white;
+  font-weight: bold;
+}
+
+.results-panel tr.upcoming-row {
+  background: #eaf4fb !important;
+}
+
+.now-passing {
+  background: #1abc9c;
+  color: white;
+  padding: 6px 10px;
+  border-radius: 4px;
+  font-size: 13px;
+  margin-bottom: 8px;
+}
+
+.error-banner {
+  background: #fdecea;
+  color: #d32f2f;
+  padding: 10px 15px;
+  border-radius: 6px;
+  border-left: 4px solid #d32f2f;
+  font-size: 13px;
+  margin: 10px 0;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.fly-controls {
+  display: flex;
+  gap: 8px;
+  margin-top: 10px;
+}
+
+.fly-button {
+  flex: 3;
+  padding: 12px;
+  border: none;
+  border-radius: 6px;
+  color: white;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.2s;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 8px;
+}
+
+.fly-button.play {
+  background: #3498db;
+}
+
+.fly-button.play:hover {
+  background: #2980b9;
+}
+
+.fly-button.pause {
+  background: #e74c3c;
+}
+
+.fly-button.pause:hover {
+  background: #c0392b;
+}
+
+.reset-flight-btn {
+  flex: 1;
+  padding: 12px;
+  background: #95a5a6;
+  color: white;
+  border: none;
+  border-radius: 6px;
+  font-weight: 600;
+  cursor: pointer;
+  transition: all 0.2s;
+}
+
+.reset-flight-btn:hover:not(:disabled) {
+  background: #7f8c8d;
+}
+
+.reset-flight-btn:disabled {
+  background: #ecf0f1;
+  color: #bdc3c7;
+  cursor: not-allowed;
 }

frontend/test-results/.last-run.json

@@ -0,0 +1,4 @@
+{
+  "status": "passed",
+  "failedTests": []
+}

frontend/vite.config.js

@@ -5,11 +5,20 @@ export default defineConfig({
   plugins: [react()],
   test: {
     globals: true,
-    environment: 'jsdom',
+    environment: 'happy-dom',
+    setupFiles: ['./src/setupTests.js'],
+    exclude: ['**/e2e/**', '**/node_modules/**'],
   },
   server: {
-    port: 3000,
+    port: 3050,
     host: '0.0.0.0',
+    allowedHosts: true,
+    proxy: {
+      '/api': {
+        target: 'http://backend:3051',
+        changeOrigin: true
+      }
+    }
   },
   build: {
     outDir: 'build',

import-cities.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# Configuration
+CONTAINER_NAME="line-of-sight-db"
+DB_USER="line_of_sight"
+DB_NAME="line_of_sight"
+DATA_FILE="./docker/data/cities.csv.gz"
+
+# Check if docker is available using the known path
+DOCKER_BIN="/usr/local/bin/docker"
+if [ ! -f "$DOCKER_BIN" ]; then
+    DOCKER_BIN=$(which docker)
+fi
+
+if [ -z "$DOCKER_BIN" ]; then
+    echo "Error: docker command not found."
+    exit 1
+fi
+
+# Check if data file exists
+if [ ! -f "$DATA_FILE" ]; then
+    echo "Error: Data file $DATA_FILE not found."
+    exit 1
+fi
+
+# Check if container is running
+if ! "$DOCKER_BIN" ps | grep -q "$CONTAINER_NAME"; then
+    echo "Error: Container $CONTAINER_NAME is not running."
+    echo "Please run 'docker-compose up -d' first."
+    exit 1
+fi
+
+echo "🚀 Starting database initialization..."
+
+# Use a HEREDOC to execute multi-line SQL
+# We load into a temp table first to handle the WKT -> Geography conversion
+IMPORT_SQL=$(cat <<EOF
+CREATE TEMP TABLE tmp_cities (
+    name VARCHAR(255),
+    population INTEGER,
+    country VARCHAR(100),
+    geom_wkt TEXT
+);
+
+COPY tmp_cities FROM STDIN WITH CSV HEADER;
+
+TRUNCATE cities;
+
+INSERT INTO cities (name, population, country, geom)
+SELECT 
+    name, 
+    population, 
+    country, 
+    ST_GeomFromText(geom_wkt, 4326)::geography
+FROM tmp_cities;
+
+DROP TABLE tmp_cities;
+
+SELECT count(*) || ' cities successfully imported.' as result FROM cities;
+EOF
+)
+
+# Stream the gzipped data into psql
+gunzip -c "$DATA_FILE" | "$DOCKER_BIN" exec -i -e PGPASSWORD=line_of_sight_pass "$CONTAINER_NAME" psql -U "$DB_USER" -d "$DB_NAME" -h 127.0.0.1 -c "$IMPORT_SQL"
+
+echo "✅ Initialization complete."