✨ feat: more tests, refactored

apps/web/hooks/use-face-blur-workflow.ts

@@ -7,6 +7,11 @@ type FaceBlurPreview = {
   effects: LayerEffect[];
 };
 
+type FaceSelectionState = {
+  key: string;
+  indices: number[];
+};
+
 type UseFaceBlurWorkflowOptions = {
   selectedLayer: Layer | null;
   faceDetectionsLayerId: string | null;
@@ -20,8 +25,7 @@ export function useFaceBlurWorkflow(options: UseFaceBlurWorkflowOptions) {
   const [blurMethod, setBlurMethod] = React.useState<FaceBlurMethod>("gaussian");
   const [blurAmount, setBlurAmount] = React.useState(14);
   const [censorColor, setCensorColor] = React.useState("#111111");
-  const [selectedFaceIndices, setSelectedFaceIndices] = React.useState<number[]>([]);
-  const [faceBlurPreview, setFaceBlurPreview] = React.useState<FaceBlurPreview | null>(null);
+  const [faceSelection, setFaceSelection] = React.useState<FaceSelectionState | null>(null);
   const hasDetectableSelection = Boolean(selectedLayer && selectedLayer.type === "raster" && faceDetectionsLayerId === selectedLayer.id);
 
   const faceBlurEffect = React.useMemo(
@@ -29,6 +33,15 @@ export function useFaceBlurWorkflow(options: UseFaceBlurWorkflowOptions) {
     [selectedLayer?.effects],
   );
 
+  const selectionKey = `${selectedLayer?.id ?? "none"}:${faceDetectionsLayerId ?? "none"}:${faceDetections.length}:${faceBlurEffect ? "effect" : "empty"}`;
+
+  const defaultSelectedFaceIndices = React.useMemo(() => {
+    if (!hasDetectableSelection || faceBlurEffect) return [];
+    return faceDetections.map((_, index) => index);
+  }, [faceDetections, faceBlurEffect, hasDetectableSelection]);
+
+  const selectedFaceIndices = faceSelection?.key === selectionKey ? faceSelection.indices : defaultSelectedFaceIndices;
+
   const buildBlurRegions = React.useCallback(
     (indices: number[]) => {
       if (!selectedLayer || selectedLayer.type !== "raster") return [];
@@ -56,14 +69,18 @@ export function useFaceBlurWorkflow(options: UseFaceBlurWorkflowOptions) {
   );
 
   const toggleFaceIndex = React.useCallback((index: number) => {
-    setSelectedFaceIndices((prev) => (prev.includes(index) ? prev.filter((item) => item !== index) : [...prev, index]));
-  }, []);
+    setFaceSelection((prev) => {
+      const current = prev?.key === selectionKey ? prev.indices : defaultSelectedFaceIndices;
+      const indices = current.includes(index) ? current.filter((item) => item !== index) : [...current, index];
+      return { key: selectionKey, indices };
+    });
+  }, [defaultSelectedFaceIndices, selectionKey]);
 
   const clearBlur = React.useCallback(() => {
     if (!selectedLayer) return;
     removeLayerEffect(selectedLayer.id, "face-blur");
-    setFaceBlurPreview(null);
-  }, [selectedLayer, removeLayerEffect]);
+    setFaceSelection({ key: selectionKey, indices: [] });
+  }, [removeLayerEffect, selectedLayer, selectionKey]);
 
   const blurFaces = React.useCallback(
     (indices: number[]) => {
@@ -78,41 +95,21 @@ export function useFaceBlurWorkflow(options: UseFaceBlurWorkflowOptions) {
         regions,
         censorColor,
       });
-      setSelectedFaceIndices([]);
-      setFaceBlurPreview(null);
+      setFaceSelection({ key: selectionKey, indices: [] });
     },
-    [blurAmount, blurMethod, buildBlurRegions, censorColor, faceDetections.length, faceDetectionsLayerId, selectedLayer, setLayerEffect],
+    [blurAmount, blurMethod, buildBlurRegions, censorColor, faceDetections.length, faceDetectionsLayerId, selectedLayer, selectionKey, setLayerEffect],
   );
 
-  React.useEffect(() => {
-    if (!hasDetectableSelection) {
-      setSelectedFaceIndices((prev) => (prev.length === 0 ? prev : []));
-      setFaceBlurPreview(null);
-      return;
-    }
-    if (faceBlurEffect) {
-      setSelectedFaceIndices((prev) => (prev.length === 0 ? prev : []));
-      return;
-    }
-    setSelectedFaceIndices((prev) => {
-      const next = faceDetections.map((_, i) => i);
-      if (prev.length === next.length && prev.every((value, index) => value === next[index])) return prev;
-      return next;
-    });
-  }, [faceDetections, hasDetectableSelection, faceBlurEffect]);
-
-  React.useEffect(() => {
+  const faceBlurPreview = React.useMemo<FaceBlurPreview | null>(() => {
     if (!hasDetectableSelection || !selectedLayer || selectedLayer.type !== "raster") {
-      setFaceBlurPreview(null);
-      return;
+      return null;
     }
 
     if (selectedFaceIndices.length === 0) {
-      setFaceBlurPreview(null);
-      return;
+      return null;
     }
 
-    setFaceBlurPreview({
+    return {
       layerId: selectedLayer.id,
       effects: [{
         kind: "face-blur",
@@ -122,7 +119,7 @@ export function useFaceBlurWorkflow(options: UseFaceBlurWorkflowOptions) {
         regions: buildBlurRegions(selectedFaceIndices),
         censorColor,
       }],
-    });
+    };
   }, [blurAmount, blurMethod, buildBlurRegions, censorColor, hasDetectableSelection, selectedFaceIndices, selectedLayer]);
 
   return {