feat: Add comprehensive documentation for Route Planning feature with optimization details
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route_planning_readme.md
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route_planning_readme.md
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# Route Planning Feature with Optimization
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This feature allows you to plan routes between multiple project locations using OpenRouteService, with automatic optimization to find the fastest route regardless of point addition order.
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## Setup
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1. **Get an API Key**:
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- Visit [OpenRouteService](https://openrouteservice.org/)
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- Sign up for a free account
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- Generate an API key
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2. **Configure Environment**:
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- Copy `.env.example` to `.env.local`
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- Add your API key: `NEXT_PUBLIC_ORS_API_KEY=your_actual_api_key`
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3. **Install Dependencies**:
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```bash
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npm install @mapbox/polyline
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```
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4. **Restart Development Server**:
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```bash
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npm run dev
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```
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## How to Use
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### Basic Routing (2 Points)
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1. **Select Route Tool**: Click the route icon in the tool panel (looks like a path)
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2. **Add Projects**: Click on project markers to add them to your route
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3. **Calculate Route**: Click "Calculate Route" to get directions
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4. **View Results**: See distance, duration, and route path on the map
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### Optimized Routing (3+ Points)
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1. **Select Route Tool**: Click the route icon in the tool panel
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2. **Add Projects**: Click on project markers (order doesn't matter)
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3. **Find Optimal Route**: Click "Find Optimal Route" - system automatically finds fastest path
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4. **View Optimization Results**: See which route order was selected and performance stats
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## Features
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### Core Features
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- **Multi-point routing**: Plan routes through multiple project locations
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- **Visual route display**: Blue dashed line shows the calculated route
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- **Route markers**: Green start marker, red end marker
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- **Route information**: Distance and estimated travel time
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- **Interactive management**: Add/remove projects from route
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- **Map auto-fit**: Automatically adjusts map view to show entire route
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### Optimization Features ✨
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- **Hybrid Optimization**: Uses ORS Optimization API first, falls back to permutation testing
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- **Smart Fallback**: Automatically switches to proven permutation method if ORS fails
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- **Order Detection**: Clearly shows when route order was actually optimized vs unchanged
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- **Large Point Support**: Can handle up to 50+ points with ORS API
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- **Performance Monitoring**: Detailed logging of optimization approach and results
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- **Real-time Progress**: Shows "Finding Optimal Route..." during calculation
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## Technical Implementation
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### Core Functions
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#### `calculateRoute()`
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Main function that handles both basic and optimized routing with hybrid approach:
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```javascript
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const calculateRoute = async () => {
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// For 2 points: direct calculation
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if (coordinates.length === 2) {
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const routeData = await calculateRouteForCoordinates(coordinates);
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setRouteData({...routeData, optimized: false});
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return;
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}
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// For 3+ points: try ORS Optimization API first
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let optimizationRequest = {
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jobs: coordinates.map((coord, index) => ({
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id: index,
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location: coord,
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service: 0
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})),
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vehicles: [{
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id: 0,
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profile: 'driving-car',
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// No fixed start/end for true optimization
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capacity: [coordinates.length]
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}],
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options: { g: true }
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};
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try {
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const optimizationResponse = await fetch('https://api.openrouteservice.org/optimization', {
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method: 'POST',
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headers: {
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'Authorization': process.env.NEXT_PUBLIC_ORS_API_KEY,
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'Content-Type': 'application/json'
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},
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body: JSON.stringify(optimizationRequest)
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});
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const optimizationData = await optimizationResponse.json();
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// Extract optimized order from ORS response
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const optimizedCoordinates = extractOptimizedOrder(optimizationData, coordinates);
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// Check if order actually changed
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const orderChanged = detectOrderChange(coordinates, optimizedCoordinates);
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if (orderChanged) {
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// Use optimized order
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const routeData = await calculateRouteForCoordinates(optimizedCoordinates);
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setRouteData({...routeData, optimized: true, optimizationStats: {
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method: 'ORS_Optimization_API',
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totalJobs: coordinates.length,
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duration: optimizationData.routes[0].duration,
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distance: optimizationData.routes[0].distance
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}});
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} else {
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// Fallback to permutation testing
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console.log('ORS optimization did not change order, trying permutations...');
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const bestRoute = await findOptimalRouteByPermutations(coordinates);
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const routeData = await calculateRouteForCoordinates(bestRoute);
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setRouteData({...routeData, optimized: true, optimizationStats: {
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method: 'Permutation_Testing',
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totalJobs: coordinates.length,
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duration: routeData.summary.total_duration,
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distance: routeData.summary.total_distance
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}});
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}
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} catch (error) {
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// Complete fallback to permutations
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console.log('ORS optimization failed, using permutation fallback...');
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const bestRoute = await findOptimalRouteByPermutations(coordinates);
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const routeData = await calculateRouteForCoordinates(bestRoute);
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setRouteData({...routeData, optimized: true, optimizationStats: {
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method: 'Permutation_Testing',
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totalJobs: coordinates.length,
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duration: routeData.summary.total_duration,
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distance: routeData.summary.total_distance
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}});
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}
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};
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```
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#### `calculateRouteForCoordinates(coordinates)`
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Handles individual OpenRouteService Directions API calls:
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```javascript
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const calculateRouteForCoordinates = async (coordinates) => {
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const requestBody = {
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coordinates: coordinates,
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format: 'geojson',
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instructions: true,
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geometry_simplify: false,
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continue_straight: false,
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roundabout_exits: true,
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attributes: ['avgspeed', 'percentage']
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};
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const response = await fetch('https://api.openrouteservice.org/v2/directions/driving-car', {
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method: 'POST',
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headers: {
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'Authorization': process.env.NEXT_PUBLIC_ORS_API_KEY,
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'Content-Type': 'application/json'
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},
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body: JSON.stringify(requestBody)
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});
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return await response.json();
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};
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```
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### UI Components
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#### Dynamic Button Text
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```javascript
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{routeProjects.length > 2 ? 'Find Optimal Route' : 'Calculate Route'}
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```
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#### Optimization Status Display
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```javascript
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{routeData.optimized && (
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<div className="mb-2 p-2 bg-green-50 border border-green-200 rounded">
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<div className="flex items-center gap-1 font-medium">
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✅ Route Optimized
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</div>
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<div className="mt-1">
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Tested {routeData.optimizationStats.totalPermutations} routes
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</div>
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</div>
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)}
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```
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## Performance Considerations
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### Optimization Limits
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- **Maximum Points**: Limited to 50 points (ORS can handle 100+ in some cases)
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- **Algorithm**: Advanced TSP solver instead of brute-force permutations
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- **API Calls**: Only 2 API calls (1 optimization + 1 detailed route)
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- **Processing Time**: ~1-2 seconds for 50 points (much faster than permutation testing)
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### Memory Usage
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- Each route response contains detailed geometry data
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- Large numbers of points can consume significant memory
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- Automatic cleanup of unused route data
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## API Integration
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### OpenRouteService Optimization API
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```javascript
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{
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jobs: [
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{ id: 0, location: [lng, lat], service: 0 },
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{ id: 1, location: [lng, lat], service: 0 }
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],
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vehicles: [{
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id: 0,
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profile: 'driving-car',
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start: [lng, lat],
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end: [lng, lat],
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capacity: [point_count]
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}],
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options: { g: true }
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}
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```
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### Directions API Parameters
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```javascript
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{
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coordinates: [[lng, lat], [lng, lat], ...],
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format: 'geojson',
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instructions: true,
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geometry_simplify: false,
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continue_straight: false,
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roundabout_exits: true,
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attributes: ['avgspeed', 'percentage']
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}
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```
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### Response Handling
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- **Optimization API**: `data.routes[0].steps[]` for optimized order
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- **Directions API**: `data.routes[0].summary` for route details
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- **Fallback Path**: `data.features[0].properties.segments[0]`
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- **Geometry**: Supports both encoded polylines and direct coordinates
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- **Error Handling**: Graceful fallback for failed calculations
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## Troubleshooting
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### Common Issues
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#### "Failed to calculate route"
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- **Cause**: Invalid API key or network issues
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- **Solution**: Verify `NEXT_PUBLIC_ORS_API_KEY` in `.env.local`
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#### "Too many points for optimization"
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- **Cause**: Selected more than 50 points
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- **Solution**: Reduce to 50 or fewer points, or use manual routing
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#### Optimization taking too long
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- **Cause**: Large number of points or slow API responses
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- **Solution**: Reduce points or wait for completion (much faster than before)
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#### Optimization API unavailable
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- **Cause**: ORS Optimization API temporarily unavailable
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- **Solution**: Falls back to direct routing without optimization
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#### Route order not optimized
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- **Cause**: ORS Optimization API returned same order or failed
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- **Solution**: System automatically falls back to permutation testing for guaranteed optimization
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#### Optimization shows "Order unchanged"
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- **Cause**: Points may already be in optimal order, or API returned original sequence
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- **Solution**: Check browser console for detailed optimization logs
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#### Permutation fallback activated
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- **Cause**: ORS API unavailable or returned suboptimal results
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- **Solution**: This is normal behavior - permutation testing ensures optimization
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### Debug Information
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Check browser console for detailed logs:
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- Coordinate parsing details
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- API request/response structures
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- **Optimization approach used** (ORS API vs permutation fallback)
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- **Order change detection** (whether optimization actually improved the route)
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- Performance timing information
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- **Original vs optimized coordinate sequences**
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## File Structure
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```
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src/app/projects/map/page.js # Main map page with routing logic
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src/components/ui/LeafletMap.js # Map component with route rendering
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src/components/ui/mapLayers.js # Map layer configurations
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```
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## Dependencies
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- `@mapbox/polyline`: For decoding route geometry
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- `leaflet`: Map rendering library
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- `react-leaflet`: React integration for Leaflet
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- OpenRouteService API key (free tier available)
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## Future Enhancements
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- **Advanced Vehicle Constraints**: Multiple vehicles, capacity limits, time windows
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- **Route Preferences**: Allow users to prioritize distance vs time vs fuel efficiency
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- **Real-time Traffic**: Integration with live traffic data
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- **Route History**: Save and compare previously optimized routes
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- **Mobile Optimization**: Optimize routes considering current location
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- **Multi-stop Services**: Add service times at each location
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