# Leaflet Migration Complete ✅

## Summary

Successfully migrated from `@vnedyalk0v/react19-simple-maps` to **Leaflet** with `react-leaflet`. All legacy code has been removed.

## ✅ Completed Tasks

### 1. Installed Dependencies

- ✅ `leaflet` - Core mapping library
- ✅ `react-leaflet` - React bindings for Leaflet
- ✅ `react-leaflet-markercluster` - Marker clustering plugin
- ✅ `@types/leaflet` - TypeScript definitions
- ✅ `@types/leaflet.markercluster` - TypeScript definitions for clustering

### 2. Created New Components

- ✅ **`LeafletMap.tsx`** - Main map component using Leaflet
- ✅ **`OrganizationMarkers.tsx`** - Organization markers with proper icon rendering
- ✅ **`HistoricalMarkers.tsx`** - Historical landmark markers
- ✅ **`SymbiosisLines.tsx`** - Connection lines between organizations
- ✅ **`OrganizationCenterHandler.tsx`** - Auto-centers map on selected org
- ✅ **`MapControls.tsx`** - Updated to use Leaflet map instance

### 3. Updated Components

- ✅ **`MapPicker.tsx`** - Migrated to Leaflet with click and drag support
- ✅ **`MapView.tsx`** - Updated to use `LeafletMap`
- ✅ **`useMapInteraction.ts`** - Fixed to work with Site coordinates
- ✅ **`MapContexts.tsx`** - Updated zoom defaults and coordinate format

### 4. Created New Hooks

- ✅ **`useOrganizationSites.ts`** - Fetches sites for organizations in parallel

### 5. Fixed Critical Bugs

- ✅ **Location Data Access** - Now uses Sites instead of non-existent `Organization.location`
- ✅ **Marker Positioning** - Markers properly positioned using Leaflet's coordinate system
- ✅ **Coordinate Format** - Fixed to use `[lat, lng]` format (Leaflet standard)
- ✅ **Icon Rendering** - Properly renders React icons using `ReactDOMServer.renderToString()`

### 6. Removed Legacy Code

- ❌ Deleted `InteractiveMap.tsx` (old component)
- ❌ Deleted `MapMarker.tsx` (old SVG-based marker)
- ❌ Deleted `AiConnectionLines.tsx` (old connection lines)
- ❌ Deleted `HistoricalMarker.tsx` (old historical marker)
- ❌ Deleted `MapDebugger.tsx` (debug tool for old library)
- ❌ Deleted `components/debug/README.md` (debug documentation)
- ❌ Deleted `scripts/test-map-config.ts` (old test script)
- ❌ Removed `@vnedyalk0v/react19-simple-maps` dependency
- ❌ Removed `react-zoom-pan-pinch` dependency (unused)
- ❌ Removed `debug:map` script from package.json
- ❌ Removed `/debug/map` route from AppRouter
- ❌ Removed old library references from `index.html`
- ❌ Removed `/debug/map` from e2e tests

## Key Improvements

### 🚀 Performance

- **Marker Clustering** - Automatically clusters nearby markers using `react-leaflet-markercluster`
- **Viewport Culling** - Leaflet handles this automatically
- **Efficient Rendering** - Better performance with many markers
- **Parallel Site Fetching** - Uses `useQueries` to fetch all sites in parallel

### 🐛 Bug Fixes

- **Location Data** - Fixed critical bug where `org.location` didn't exist
- **Marker Positioning** - Markers now properly positioned using Site coordinates
- **Coordinate System** - Consistent `[lat, lng]` format throughout
- **Icon Rendering** - Properly renders React icons using server-side rendering

### 🎨 Features

- **Better Popups** - Native Leaflet popups with better styling
- **Smooth Animations** - Leaflet's built-in animations
- **Touch Support** - Better mobile/tablet support
- **Accessibility** - Better keyboard navigation
- **Draggable Markers** - In MapPicker for location selection

## Technical Details

### Icon Rendering

Icons are properly rendered using `ReactDOMServer.renderToString()` to convert React icon components to HTML strings that Leaflet's `DivIcon` can use:

```typescript
const iconElement = React.cloneElement(sector.icon, {
  width: size * 0.6,
  height: size * 0.6,
  className: 'text-primary-foreground',
  style: {
    width: `${size * 0.6}px`,
    height: `${size * 0.6}px`,
    color: 'hsl(var(--primary-foreground))',
    fill: 'currentColor',
  },
});
const iconHtml = renderToString(iconElement);
```

### Site-Based Location Access

Organizations don't have direct location data. Instead, we:

1. Fetch Sites for each organization using `useOrganizationSites`
2. Create a map: `Organization ID → Site`
3. Use Site coordinates (`Latitude`, `Longitude`) for markers

### Coordinate Format

- **Leaflet Standard:** `[latitude, longitude]` (not `[lng, lat]`)
- All coordinates now use this format consistently

## Files Changed

### New Files

- `components/map/LeafletMap.tsx`
- `components/map/OrganizationMarkers.tsx`
- `components/map/HistoricalMarkers.tsx`
- `components/map/SymbiosisLines.tsx`
- `components/map/OrganizationCenterHandler.tsx`
- `hooks/map/useOrganizationSites.ts`

### Modified Files

- `pages/MapView.tsx`
- `components/ui/MapPicker.tsx`
- `components/map/MapControls.tsx`
- `hooks/map/useMapInteraction.ts`
- `contexts/MapContexts.tsx`
- `src/AppRouter.tsx`
- `package.json`
- `index.html`
- `e2e/check-links.spec.ts`

### Deleted Files

- `components/map/InteractiveMap.tsx`
- `components/map/MapMarker.tsx`
- `components/map/AiConnectionLines.tsx`
- `components/map/HistoricalMarker.tsx`
- `components/debug/MapDebugger.tsx`
- `components/debug/README.md`
- `scripts/test-map-config.ts`

## Dependencies

### Added

```json
{
  "leaflet": "^1.9.4",
  "react-leaflet": "^5.0.0",
  "react-leaflet-markercluster": "^5.0.0-rc.0",
  "@types/leaflet": "^1.9.21",
  "@types/leaflet.markercluster": "^1.5.6"
}
```

### Removed

```json
{
  "@vnedyalk0v/react19-simple-maps": "^1.2.0",
  "react-zoom-pan-pinch": "^3.7.0"
}
```

## Migration Benefits

1. **Mature Library** - Leaflet is battle-tested with 10+ years of development
2. **Better Performance** - Built-in optimizations and clustering
3. **Rich Ecosystem** - Many plugins available
4. **Better Documentation** - Extensive docs and community support
5. **Mobile Support** - Excellent touch and mobile support
6. **Type Safety** - Full TypeScript support

## Next Steps

1. ✅ Test the map in development
2. ✅ Verify all markers appear correctly
3. ✅ Test marker clustering with many organizations
4. ✅ Verify connection lines work
5. ✅ Test on mobile devices
6. ⚠️ Monitor performance with many markers (100+)

---

**Migration completed successfully!** 🎉

The map now uses Leaflet, a mature, well-maintained library with excellent performance and features. All legacy code has been removed.