feat(geoportal): rectangle + freehand polygon selection drawing on map

Rectangle mode (Dreptunghi):
- Mousedown starts drawing, mousemove shows amber overlay, mouseup selects
- All terenuri features in the drawn bbox are added to selection
- Map panning disabled during draw, re-enabled after
- Minimum 5px size to prevent accidental micro-selections

Freehand mode (Desen):
- Each click adds a point, polygon drawn with GeoJSON source
- Double-click closes polygon, selects features whose centroid is inside
- Ray-casting point-in-polygon algorithm for spatial filtering
- Double-click zoom disabled during freehand mode

Draw state clears when switching selection modes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/geoportal/components/geoportal-module.tsx

@@ -63,7 +63,7 @@ export function GeoportalModule() {
         ref={mapHandleRef}
         className="h-full w-full"
         basemap={basemap}
-        selectionMode={selectionMode !== "off"}
+        selectionType={selectionMode}
         onFeatureClick={handleFeatureClick}
         onSelectionChange={setSelectedFeatures}
         layerVisibility={layerVisibility}

src/modules/geoportal/components/map-viewer.tsx

@@ -17,6 +17,12 @@ if (typeof document !== "undefined") {
 }
 import type { BasemapId, ClickedFeature, LayerVisibility, SelectedFeature } from "../types";
 
+/* ------------------------------------------------------------------ */
+/*  Selection type (re-exported for convenience)                       */
+/* ------------------------------------------------------------------ */
+
+export type SelectionType = "off" | "click" | "rect" | "freehand";
+
 /* ------------------------------------------------------------------ */
 /*  Constants                                                          */
 /* ------------------------------------------------------------------ */
@@ -54,8 +60,12 @@ const LAYER_IDS = {
   cladiriLine: "l-cladiri-line",
   selectionFill: "l-selection-fill",
   selectionLine: "l-selection-line",
+  drawPolygonFill: "l-draw-polygon-fill",
+  drawPolygonLine: "l-draw-polygon-line",
 } as const;
 
+const DRAW_SOURCE = "draw-polygon";
+
 /* ---- Basemap definitions ---- */
 type BasemapDef =
   | { type: "style"; url: string; maxzoom?: number }
@@ -90,6 +100,34 @@ function buildStyle(def: BasemapDef): string | maplibregl.StyleSpecification {
   };
 }
 
+/* ------------------------------------------------------------------ */
+/*  Point-in-polygon (ray casting)                                     */
+/* ------------------------------------------------------------------ */
+
+function pointInPolygon(point: [number, number], polygon: [number, number][]): boolean {
+  let inside = false;
+  for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+    const pi = polygon[i];
+    const pj = polygon[j];
+    if (!pi || !pj) continue;
+    const xi = pi[0], yi = pi[1];
+    const xj = pj[0], yj = pj[1];
+    if ((yi > point[1]) !== (yj > point[1]) && point[0] < ((xj - xi) * (point[1] - yi)) / (yj - yi) + xi) {
+      inside = !inside;
+    }
+  }
+  return inside;
+}
+
+/* ------------------------------------------------------------------ */
+/*  Empty GeoJSON constant                                             */
+/* ------------------------------------------------------------------ */
+
+const EMPTY_GEOJSON: GeoJSON.FeatureCollection = {
+  type: "FeatureCollection",
+  features: [],
+};
+
 /* ------------------------------------------------------------------ */
 /*  Props & Handle                                                     */
 /* ------------------------------------------------------------------ */
@@ -107,7 +145,7 @@ type MapViewerProps = {
   martinUrl?: string;
   className?: string;
   basemap?: BasemapId;
-  selectionMode?: boolean;
+  selectionType?: SelectionType;
   onFeatureClick?: (feature: ClickedFeature) => void;
   onSelectionChange?: (features: SelectedFeature[]) => void;
   layerVisibility?: LayerVisibility;
@@ -122,7 +160,7 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
     {
       center, zoom, martinUrl, className,
       basemap = "liberty",
-      selectionMode = false,
+      selectionType = "off",
       onFeatureClick, onSelectionChange, layerVisibility,
     },
     ref
@@ -130,13 +168,21 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
     const containerRef = useRef<HTMLDivElement>(null);
     const mapRef = useRef<maplibregl.Map | null>(null);
     const selectedRef = useRef<Map<string, SelectedFeature>>(new Map());
-    const selectionModeRef = useRef(selectionMode);
+    const selectionTypeRef = useRef<SelectionType>(selectionType);
     const [mapReady, setMapReady] = useState(false);
 
     // Persist view state across basemap switches
     const viewStateRef = useRef({ center: center ?? DEFAULT_CENTER, zoom: zoom ?? DEFAULT_ZOOM });
 
-    selectionModeRef.current = selectionMode;
+    // --- Rectangle drawing state ---
+    const rectStartRef = useRef<{ x: number; y: number } | null>(null);
+    const rectOverlayRef = useRef<HTMLDivElement | null>(null);
+    const rectDrawingRef = useRef(false);
+
+    // --- Freehand polygon drawing state ---
+    const freehandPointsRef = useRef<[number, number][]>([]);
+
+    selectionTypeRef.current = selectionType;
 
     const resolvedMartinUrl = (() => {
       const raw = martinUrl ?? DEFAULT_MARTIN_URL;
@@ -166,6 +212,84 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
       onSelectionChange?.([]);
     }, [updateSelectionFilter, onSelectionChange]);
 
+    /* ---- Clear draw state helper ---- */
+    const clearDrawState = useCallback(() => {
+      // Clear rect state
+      rectStartRef.current = null;
+      rectDrawingRef.current = false;
+      if (rectOverlayRef.current) {
+        rectOverlayRef.current.remove();
+        rectOverlayRef.current = null;
+      }
+      // Clear freehand state
+      freehandPointsRef.current = [];
+      // Clear draw polygon source on map
+      const map = mapRef.current;
+      if (map) {
+        try {
+          const src = map.getSource(DRAW_SOURCE) as maplibregl.GeoJSONSource | undefined;
+          if (src) src.setData(EMPTY_GEOJSON);
+        } catch { /* noop */ }
+        // Re-enable drag pan in case it was disabled
+        try { map.dragPan.enable(); } catch { /* noop */ }
+      }
+    }, []);
+
+    /* ---- Update draw polygon source ---- */
+    const updateDrawPolygon = useCallback((points: [number, number][]) => {
+      const map = mapRef.current;
+      if (!map) return;
+      try {
+        const src = map.getSource(DRAW_SOURCE) as maplibregl.GeoJSONSource | undefined;
+        if (!src) return;
+        if (points.length < 2) {
+          src.setData(EMPTY_GEOJSON);
+          return;
+        }
+        // Show as polygon if 3+ points, otherwise as line
+        const coords = [...points];
+        if (points.length >= 3) {
+          // Close the ring for display
+          const first = points[0];
+          if (first) coords.push(first);
+        }
+        const features: GeoJSON.Feature[] = [];
+        if (points.length >= 3) {
+          features.push({
+            type: "Feature",
+            properties: {},
+            geometry: { type: "Polygon", coordinates: [coords] },
+          });
+        }
+        // Always draw the line
+        features.push({
+          type: "Feature",
+          properties: {},
+          geometry: { type: "LineString", coordinates: coords },
+        });
+        src.setData({ type: "FeatureCollection", features });
+      } catch { /* noop */ }
+    }, []);
+
+    /* ---- Add terenuri features from a pixel bbox to selection ---- */
+    const addFeaturesFromBbox = useCallback((bbox: [maplibregl.PointLike, maplibregl.PointLike]) => {
+      const map = mapRef.current;
+      if (!map) return;
+      try {
+        const features = map.queryRenderedFeatures(bbox);
+        for (const f of features) {
+          const sl = f.sourceLayer ?? f.source ?? "";
+          if (sl !== SOURCES.terenuri) continue;
+          const props = (f.properties ?? {}) as Record<string, unknown>;
+          const objectId = String(props.object_id ?? "");
+          if (!objectId) continue;
+          selectedRef.current.set(objectId, { id: objectId, sourceLayer: sl, properties: props });
+        }
+        updateSelectionFilter();
+        onSelectionChange?.(Array.from(selectedRef.current.values()));
+      } catch { /* noop */ }
+    }, [updateSelectionFilter, onSelectionChange]);
+
     /* ---- Imperative handle ---- */
     useImperativeHandle(ref, () => ({
       getMap: () => mapRef.current,
@@ -203,6 +327,11 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
       if (mapReady && layerVisibility) applyLayerVisibility(layerVisibility);
     }, [mapReady, layerVisibility, applyLayerVisibility]);
 
+    /* ---- Clean up draw state when selectionType changes ---- */
+    useEffect(() => {
+      clearDrawState();
+    }, [selectionType, clearDrawState]);
+
     /* ---- Map initialization (recreates on basemap change) ---- */
     useEffect(() => {
       if (!containerRef.current) return;
@@ -302,6 +431,18 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
           filter: ["==", "object_id", "__NONE__"],
           paint: { "line-color": "#d97706", "line-width": 2.5 } });
 
+        // === Draw polygon source + layers (for freehand) ===
+        map.addSource(DRAW_SOURCE, { type: "geojson", data: EMPTY_GEOJSON });
+        map.addLayer({
+          id: LAYER_IDS.drawPolygonFill, type: "fill", source: DRAW_SOURCE,
+          filter: ["==", "$type", "Polygon"],
+          paint: { "fill-color": "#f59e0b", "fill-opacity": 0.2 },
+        });
+        map.addLayer({
+          id: LAYER_IDS.drawPolygonLine, type: "line", source: DRAW_SOURCE,
+          paint: { "line-color": "#f59e0b", "line-width": 2, "line-dasharray": [3, 2] },
+        });
+
         if (layerVisibility) applyLayerVisibility(layerVisibility);
         setMapReady(true);
       });
@@ -313,6 +454,19 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
       ];
 
       map.on("click", (e) => {
+        const mode = selectionTypeRef.current;
+
+        // --- Freehand mode: clicks add points ---
+        if (mode === "freehand") {
+          const lngLat: [number, number] = [e.lngLat.lng, e.lngLat.lat];
+          freehandPointsRef.current.push(lngLat);
+          updateDrawPolygon(freehandPointsRef.current);
+          return;
+        }
+
+        // --- Rect mode: clicks are handled by mousedown/up, ignore normal clicks ---
+        if (mode === "rect") return;
+
         const features = map.queryRenderedFeatures(e.point, {
           layers: clickableLayers.filter((l) => { try { return !!map.getLayer(l); } catch { return false; } }),
         });
@@ -328,8 +482,8 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
         const props = (first.properties ?? {}) as Record<string, unknown>;
         const sourceLayer = first.sourceLayer ?? first.source ?? "";
 
-        // Selection mode
-        if (selectionModeRef.current && sourceLayer === SOURCES.terenuri) {
+        // Click selection mode
+        if (mode === "click" && sourceLayer === SOURCES.terenuri) {
           const objectId = String(props.object_id ?? "");
           if (!objectId) return;
           if (selectedRef.current.has(objectId)) {
@@ -342,15 +496,172 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
           return;
         }
 
-        // Feature click — notify parent (no popup)
+        // Feature click — notify parent (no popup) — only when off or click mode on non-terenuri
+        if (mode === "off") {
           onFeatureClick?.({
             layerId: first.layer?.id ?? "",
             sourceLayer,
             properties: props,
             coordinates: [e.lngLat.lng, e.lngLat.lat],
           });
+        }
       });
 
+      /* ---- Double-click handler for freehand polygon completion ---- */
+      map.on("dblclick", (e) => {
+        const mode = selectionTypeRef.current;
+        if (mode !== "freehand") return;
+
+        // Prevent default double-click zoom
+        e.preventDefault();
+
+        const points = freehandPointsRef.current;
+        if (points.length < 3) {
+          // Not enough points, clear
+          freehandPointsRef.current = [];
+          updateDrawPolygon([]);
+          return;
+        }
+
+        // Close polygon — compute pixel bbox of all points
+        let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
+        for (const pt of points) {
+          const px = map.project(pt);
+          if (px.x < minX) minX = px.x;
+          if (px.y < minY) minY = px.y;
+          if (px.x > maxX) maxX = px.x;
+          if (px.y > maxY) maxY = px.y;
+        }
+
+        // Query all rendered features in the bbox
+        try {
+          const allFeatures = map.queryRenderedFeatures(
+            [[minX, minY], [maxX, maxY]] as [maplibregl.PointLike, maplibregl.PointLike]
+          );
+
+          // For each terenuri feature, check if center is inside the drawn polygon
+          for (const f of allFeatures) {
+            const sl = f.sourceLayer ?? f.source ?? "";
+            if (sl !== SOURCES.terenuri) continue;
+            const props = (f.properties ?? {}) as Record<string, unknown>;
+            const objectId = String(props.object_id ?? "");
+            if (!objectId) continue;
+
+            // Get feature center in lng/lat
+            // Use the feature's geometry bbox center via queryRenderedFeatures pixel point
+            // Since we're dealing with rendered features, use the feature geometry
+            const geom = f.geometry;
+            let centerLngLat: [number, number] | null = null;
+
+            if (geom.type === "Polygon" || geom.type === "MultiPolygon") {
+              // Compute centroid from coordinates
+              const coords = geom.type === "Polygon" ? geom.coordinates[0] : geom.coordinates[0]?.[0];
+              if (coords && coords.length > 0) {
+                let cx = 0, cy = 0;
+                for (const c of coords) {
+                  const coord = c as [number, number];
+                  cx += coord[0];
+                  cy += coord[1];
+                }
+                centerLngLat = [cx / coords.length, cy / coords.length];
+              }
+            } else if (geom.type === "Point") {
+              centerLngLat = geom.coordinates as [number, number];
+            }
+
+            if (!centerLngLat) continue;
+
+            if (pointInPolygon(centerLngLat, points)) {
+              selectedRef.current.set(objectId, { id: objectId, sourceLayer: sl, properties: props });
+            }
+          }
+
+          updateSelectionFilter();
+          onSelectionChange?.(Array.from(selectedRef.current.values()));
+        } catch { /* noop */ }
+
+        // Clear draw polygon
+        freehandPointsRef.current = [];
+        updateDrawPolygon([]);
+      });
+
+      /* ---- Rectangle selection: mousedown/mousemove/mouseup on canvas ---- */
+      const canvas = map.getCanvas();
+
+      const onRectMouseDown = (e: MouseEvent) => {
+        if (selectionTypeRef.current !== "rect") return;
+        // Only respond to left-click (button 0)
+        if (e.button !== 0) return;
+
+        rectStartRef.current = { x: e.offsetX, y: e.offsetY };
+        rectDrawingRef.current = true;
+
+        // Disable map drag pan while drawing rectangle
+        map.dragPan.disable();
+
+        // Create overlay div
+        const container = containerRef.current;
+        if (!container) return;
+        const overlay = document.createElement("div");
+        overlay.style.position = "absolute";
+        overlay.style.pointerEvents = "none";
+        overlay.style.backgroundColor = "rgba(245, 158, 11, 0.2)";
+        overlay.style.border = "2px solid rgba(245, 158, 11, 0.8)";
+        overlay.style.left = `${e.offsetX}px`;
+        overlay.style.top = `${e.offsetY}px`;
+        overlay.style.width = "0px";
+        overlay.style.height = "0px";
+        overlay.style.zIndex = "10";
+        container.appendChild(overlay);
+        rectOverlayRef.current = overlay;
+      };
+
+      const onRectMouseMove = (e: MouseEvent) => {
+        if (!rectDrawingRef.current || !rectStartRef.current || !rectOverlayRef.current) return;
+        const start = rectStartRef.current;
+        const overlay = rectOverlayRef.current;
+        const x = Math.min(start.x, e.offsetX);
+        const y = Math.min(start.y, e.offsetY);
+        const w = Math.abs(e.offsetX - start.x);
+        const h = Math.abs(e.offsetY - start.y);
+        overlay.style.left = `${x}px`;
+        overlay.style.top = `${y}px`;
+        overlay.style.width = `${w}px`;
+        overlay.style.height = `${h}px`;
+      };
+
+      const onRectMouseUp = (e: MouseEvent) => {
+        if (!rectDrawingRef.current || !rectStartRef.current) return;
+        rectDrawingRef.current = false;
+
+        const start = rectStartRef.current;
+        rectStartRef.current = null;
+
+        // Re-enable drag pan
+        map.dragPan.enable();
+
+        // Remove overlay
+        if (rectOverlayRef.current) {
+          rectOverlayRef.current.remove();
+          rectOverlayRef.current = null;
+        }
+
+        // Compute pixel bbox
+        const x1 = Math.min(start.x, e.offsetX);
+        const y1 = Math.min(start.y, e.offsetY);
+        const x2 = Math.max(start.x, e.offsetX);
+        const y2 = Math.max(start.y, e.offsetY);
+
+        // Minimum size check (avoid accidental tiny rectangles)
+        if (Math.abs(x2 - x1) < 5 && Math.abs(y2 - y1) < 5) return;
+
+        addFeaturesFromBbox([[x1, y1], [x2, y2]]);
+      };
+
+      canvas.addEventListener("mousedown", onRectMouseDown);
+      canvas.addEventListener("mousemove", onRectMouseMove);
+      canvas.addEventListener("mouseup", onRectMouseUp);
+
       /* ---- Cursor change ---- */
       for (const lid of clickableLayers) {
         map.on("mouseenter", lid, () => { map.getCanvas().style.cursor = "pointer"; });
@@ -359,6 +670,14 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
 
       /* ---- Cleanup ---- */
       return () => {
+        canvas.removeEventListener("mousedown", onRectMouseDown);
+        canvas.removeEventListener("mousemove", onRectMouseMove);
+        canvas.removeEventListener("mouseup", onRectMouseUp);
+        // Clean up any lingering overlay
+        if (rectOverlayRef.current) {
+          rectOverlayRef.current.remove();
+          rectOverlayRef.current = null;
+        }
         map.remove();
         mapRef.current = null;
         setMapReady(false);
@@ -372,9 +691,20 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
       mapRef.current.flyTo({ center, zoom: zoom ?? mapRef.current.getZoom(), duration: 1500 });
     }, [center, zoom, mapReady]);
 
+    /* ---- Disable double-click zoom when in freehand mode ---- */
+    useEffect(() => {
+      const map = mapRef.current;
+      if (!map) return;
+      if (selectionType === "freehand") {
+        map.doubleClickZoom.disable();
+      } else {
+        map.doubleClickZoom.enable();
+      }
+    }, [selectionType, mapReady]);
+
     return (
       <div className={cn("absolute inset-0", className)}>
-        <div ref={containerRef} className="w-full h-full" />
+        <div ref={containerRef} className="relative w-full h-full" />
         {!mapReady && (
           <div className="absolute inset-0 flex items-center justify-center bg-muted/50">
             <p className="text-sm text-muted-foreground">Se incarca harta...</p>