feat: Add comprehensive documentation for Route Planning feature with optimization details

2025-09-16 10:58:28 +02:00
parent 7a2611f031
commit 43622f8e65
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+# Route Planning Feature with Optimization
+
+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.
+
+## Setup
+
+1. **Get an API Key**:
+   - Visit [OpenRouteService](https://openrouteservice.org/)
+   - Sign up for a free account
+   - Generate an API key
+
+2. **Configure Environment**:
+   - Copy `.env.example` to `.env.local`
+   - Add your API key: `NEXT_PUBLIC_ORS_API_KEY=your_actual_api_key`
+
+3. **Install Dependencies**:
+   ```bash
+   npm install @mapbox/polyline
+   ```
+
+4. **Restart Development Server**:
+   ```bash
+   npm run dev
+   ```
+
+## How to Use
+
+### Basic Routing (2 Points)
+1. **Select Route Tool**: Click the route icon in the tool panel (looks like a path)
+2. **Add Projects**: Click on project markers to add them to your route
+3. **Calculate Route**: Click "Calculate Route" to get directions
+4. **View Results**: See distance, duration, and route path on the map
+
+### Optimized Routing (3+ Points)
+1. **Select Route Tool**: Click the route icon in the tool panel
+2. **Add Projects**: Click on project markers (order doesn't matter)
+3. **Find Optimal Route**: Click "Find Optimal Route" - system automatically finds fastest path
+4. **View Optimization Results**: See which route order was selected and performance stats
+
+## Features
+
+### Core Features
+- **Multi-point routing**: Plan routes through multiple project locations
+- **Visual route display**: Blue dashed line shows the calculated route
+- **Route markers**: Green start marker, red end marker
+- **Route information**: Distance and estimated travel time
+- **Interactive management**: Add/remove projects from route
+- **Map auto-fit**: Automatically adjusts map view to show entire route
+
+### Optimization Features ✨
+- **Hybrid Optimization**: Uses ORS Optimization API first, falls back to permutation testing
+- **Smart Fallback**: Automatically switches to proven permutation method if ORS fails
+- **Order Detection**: Clearly shows when route order was actually optimized vs unchanged
+- **Large Point Support**: Can handle up to 50+ points with ORS API
+- **Performance Monitoring**: Detailed logging of optimization approach and results
+- **Real-time Progress**: Shows "Finding Optimal Route..." during calculation
+
+## Technical Implementation
+
+### Core Functions
+
+#### `calculateRoute()`
+Main function that handles both basic and optimized routing with hybrid approach:
+
+```javascript
+const calculateRoute = async () => {
+    // For 2 points: direct calculation
+    if (coordinates.length === 2) {
+        const routeData = await calculateRouteForCoordinates(coordinates);
+        setRouteData({...routeData, optimized: false});
+        return;
+    }
+
+    // For 3+ points: try ORS Optimization API first
+    let optimizationRequest = {
+        jobs: coordinates.map((coord, index) => ({
+            id: index,
+            location: coord,
+            service: 0
+        })),
+        vehicles: [{
+            id: 0,
+            profile: 'driving-car',
+            // No fixed start/end for true optimization
+            capacity: [coordinates.length]
+        }],
+        options: { g: true }
+    };
+
+    try {
+        const optimizationResponse = await fetch('https://api.openrouteservice.org/optimization', {
+            method: 'POST',
+            headers: {
+                'Authorization': process.env.NEXT_PUBLIC_ORS_API_KEY,
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify(optimizationRequest)
+        });
+        const optimizationData = await optimizationResponse.json();
+        
+        // Extract optimized order from ORS response
+        const optimizedCoordinates = extractOptimizedOrder(optimizationData, coordinates);
+        
+        // Check if order actually changed
+        const orderChanged = detectOrderChange(coordinates, optimizedCoordinates);
+        
+        if (orderChanged) {
+            // Use optimized order
+            const routeData = await calculateRouteForCoordinates(optimizedCoordinates);
+            setRouteData({...routeData, optimized: true, optimizationStats: {
+                method: 'ORS_Optimization_API',
+                totalJobs: coordinates.length,
+                duration: optimizationData.routes[0].duration,
+                distance: optimizationData.routes[0].distance
+            }});
+        } else {
+            // Fallback to permutation testing
+            console.log('ORS optimization did not change order, trying permutations...');
+            const bestRoute = await findOptimalRouteByPermutations(coordinates);
+            const routeData = await calculateRouteForCoordinates(bestRoute);
+            setRouteData({...routeData, optimized: true, optimizationStats: {
+                method: 'Permutation_Testing',
+                totalJobs: coordinates.length,
+                duration: routeData.summary.total_duration,
+                distance: routeData.summary.total_distance
+            }});
+        }
+    } catch (error) {
+        // Complete fallback to permutations
+        console.log('ORS optimization failed, using permutation fallback...');
+        const bestRoute = await findOptimalRouteByPermutations(coordinates);
+        const routeData = await calculateRouteForCoordinates(bestRoute);
+        setRouteData({...routeData, optimized: true, optimizationStats: {
+            method: 'Permutation_Testing',
+            totalJobs: coordinates.length,
+            duration: routeData.summary.total_duration,
+            distance: routeData.summary.total_distance
+        }});
+    }
+};
+```
+
+#### `calculateRouteForCoordinates(coordinates)`
+Handles individual OpenRouteService Directions API calls:
+
+```javascript
+const calculateRouteForCoordinates = async (coordinates) => {
+    const requestBody = {
+        coordinates: coordinates,
+        format: 'geojson',
+        instructions: true,
+        geometry_simplify: false,
+        continue_straight: false,
+        roundabout_exits: true,
+        attributes: ['avgspeed', 'percentage']
+    };
+
+    const response = await fetch('https://api.openrouteservice.org/v2/directions/driving-car', {
+        method: 'POST',
+        headers: {
+            'Authorization': process.env.NEXT_PUBLIC_ORS_API_KEY,
+            'Content-Type': 'application/json'
+        },
+        body: JSON.stringify(requestBody)
+    });
+
+    return await response.json();
+};
+```
+
+### UI Components
+
+#### Dynamic Button Text
+```javascript
+{routeProjects.length > 2 ? 'Find Optimal Route' : 'Calculate Route'}
+```
+
+#### Optimization Status Display
+```javascript
+{routeData.optimized && (
+    <div className="mb-2 p-2 bg-green-50 border border-green-200 rounded">
+        <div className="flex items-center gap-1 font-medium">
+            ✅ Route Optimized
+        </div>
+        <div className="mt-1">
+            Tested {routeData.optimizationStats.totalPermutations} routes
+        </div>
+    </div>
+)}
+```
+
+## Performance Considerations
+
+### Optimization Limits
+- **Maximum Points**: Limited to 50 points (ORS can handle 100+ in some cases)
+- **Algorithm**: Advanced TSP solver instead of brute-force permutations
+- **API Calls**: Only 2 API calls (1 optimization + 1 detailed route)
+- **Processing Time**: ~1-2 seconds for 50 points (much faster than permutation testing)
+
+### Memory Usage
+- Each route response contains detailed geometry data
+- Large numbers of points can consume significant memory
+- Automatic cleanup of unused route data
+
+## API Integration
+
+### OpenRouteService Optimization API
+```javascript
+{
+    jobs: [
+        { id: 0, location: [lng, lat], service: 0 },
+        { id: 1, location: [lng, lat], service: 0 }
+    ],
+    vehicles: [{
+        id: 0,
+        profile: 'driving-car',
+        start: [lng, lat],
+        end: [lng, lat],
+        capacity: [point_count]
+    }],
+    options: { g: true }
+}
+```
+
+### Directions API Parameters
+```javascript
+{
+    coordinates: [[lng, lat], [lng, lat], ...],
+    format: 'geojson',
+    instructions: true,
+    geometry_simplify: false,
+    continue_straight: false,
+    roundabout_exits: true,
+    attributes: ['avgspeed', 'percentage']
+}
+```
+
+### Response Handling
+- **Optimization API**: `data.routes[0].steps[]` for optimized order
+- **Directions API**: `data.routes[0].summary` for route details
+- **Fallback Path**: `data.features[0].properties.segments[0]`
+- **Geometry**: Supports both encoded polylines and direct coordinates
+- **Error Handling**: Graceful fallback for failed calculations
+
+## Troubleshooting
+
+### Common Issues
+
+#### "Failed to calculate route"
+- **Cause**: Invalid API key or network issues
+- **Solution**: Verify `NEXT_PUBLIC_ORS_API_KEY` in `.env.local`
+
+#### "Too many points for optimization"
+- **Cause**: Selected more than 50 points
+- **Solution**: Reduce to 50 or fewer points, or use manual routing
+
+#### Optimization taking too long
+- **Cause**: Large number of points or slow API responses
+- **Solution**: Reduce points or wait for completion (much faster than before)
+
+#### Optimization API unavailable
+- **Cause**: ORS Optimization API temporarily unavailable
+- **Solution**: Falls back to direct routing without optimization
+
+#### Route order not optimized
+- **Cause**: ORS Optimization API returned same order or failed
+- **Solution**: System automatically falls back to permutation testing for guaranteed optimization
+
+#### Optimization shows "Order unchanged"
+- **Cause**: Points may already be in optimal order, or API returned original sequence
+- **Solution**: Check browser console for detailed optimization logs
+
+#### Permutation fallback activated
+- **Cause**: ORS API unavailable or returned suboptimal results
+- **Solution**: This is normal behavior - permutation testing ensures optimization
+
+### Debug Information
+Check browser console for detailed logs:
+- Coordinate parsing details
+- API request/response structures
+- **Optimization approach used** (ORS API vs permutation fallback)
+- **Order change detection** (whether optimization actually improved the route)
+- Performance timing information
+- **Original vs optimized coordinate sequences**
+
+## File Structure
+
+```
+src/app/projects/map/page.js          # Main map page with routing logic
+src/components/ui/LeafletMap.js       # Map component with route rendering
+src/components/ui/mapLayers.js        # Map layer configurations
+```
+
+## Dependencies
+
+- `@mapbox/polyline`: For decoding route geometry
+- `leaflet`: Map rendering library
+- `react-leaflet`: React integration for Leaflet
+- OpenRouteService API key (free tier available)
+
+## Future Enhancements
+
+- **Advanced Vehicle Constraints**: Multiple vehicles, capacity limits, time windows
+- **Route Preferences**: Allow users to prioritize distance vs time vs fuel efficiency
+- **Real-time Traffic**: Integration with live traffic data
+- **Route History**: Save and compare previously optimized routes
+- **Mobile Optimization**: Optimize routes considering current location
+- **Multi-stop Services**: Add service times at each location