feat(pet): circular avatar cropping with zoom before upload

Adds an AvatarCropDialog step (react-easy-crop, cropShape="round")
between file selection and the presigned-URL upload in AvatarUpload:
the user crops/zooms a circular region, which is re-encoded via canvas
to the original file's mime type before the existing upload flow runs.
File-size/type validation moved from uploadFile into the new
selectFile gate that opens the dialog.

Gitea #13

src/components/pet/AvatarCropDialog.tsx

@@ -0,0 +1,110 @@
+"use client";
+
+import { useCallback, useState } from "react";
+import Cropper, { type Area } from "react-easy-crop";
+import { useTranslations } from "next-intl";
+import {
+  Dialog,
+  DialogContent,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Button } from "@/components/ui/button";
+import { getCroppedImageBlob } from "@/lib/crop-image";
+
+interface AvatarCropDialogProps {
+  imageSrc: string;
+  mimeType: string;
+  onCancel: () => void;
+  onCropped: (blob: Blob) => void;
+}
+
+/**
+ * Circular crop step between file selection and upload — cropShape="round"
+ * gives the darkened-outside-the-circle overlay for free (react-easy-crop's
+ * built-in mask), no hand-rolled canvas overlay needed.
+ */
+export function AvatarCropDialog({
+  imageSrc,
+  mimeType,
+  onCancel,
+  onCropped,
+}: AvatarCropDialogProps) {
+  const t = useTranslations("AvatarUpload");
+  const [crop, setCrop] = useState({ x: 0, y: 0 });
+  const [zoom, setZoom] = useState(1);
+  const [cropAreaPixels, setCropAreaPixels] = useState<Area | null>(null);
+  const [isProcessing, setIsProcessing] = useState(false);
+
+  const handleCropComplete = useCallback((_area: Area, areaPixels: Area) => {
+    setCropAreaPixels(areaPixels);
+  }, []);
+
+  const handleConfirm = useCallback(async () => {
+    if (!cropAreaPixels) return;
+    setIsProcessing(true);
+    try {
+      const blob = await getCroppedImageBlob(imageSrc, cropAreaPixels, mimeType);
+      onCropped(blob);
+    } finally {
+      setIsProcessing(false);
+    }
+  }, [cropAreaPixels, imageSrc, mimeType, onCropped]);
+
+  return (
+    <Dialog
+      open
+      onOpenChange={(next) => {
+        if (!next) onCancel();
+      }}
+    >
+      <DialogContent className="max-w-sm sm:max-w-md" showCloseButton={false}>
+        <DialogHeader>
+          <DialogTitle>{t("cropTitle")}</DialogTitle>
+        </DialogHeader>
+
+        <div className="relative h-72 w-full overflow-hidden rounded-lg bg-black">
+          <Cropper
+            image={imageSrc}
+            crop={crop}
+            zoom={zoom}
+            aspect={1}
+            cropShape="round"
+            showGrid={false}
+            onCropChange={setCrop}
+            onZoomChange={setZoom}
+            onCropComplete={handleCropComplete}
+          />
+        </div>
+
+        <div className="flex items-center gap-3 px-1">
+          <span className="shrink-0 text-xs text-muted-foreground">{t("zoom")}</span>
+          <input
+            type="range"
+            min={1}
+            max={3}
+            step={0.01}
+            value={zoom}
+            onChange={(e) => setZoom(Number(e.target.value))}
+            className="w-full accent-orange-500"
+            aria-label={t("zoom")}
+          />
+        </div>
+
+        <DialogFooter>
+          <Button type="button" variant="outline" onClick={onCancel} disabled={isProcessing}>
+            {t("cropCancel")}
+          </Button>
+          <Button
+            type="button"
+            onClick={handleConfirm}
+            disabled={!cropAreaPixels || isProcessing}
+          >
+            {isProcessing ? t("cropSaving") : t("cropSave")}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  );
+}

src/components/pet/AvatarUpload.tsx

@@ -9,6 +9,7 @@ import { useMutation } from "@tanstack/react-query";
 import { Avatar, AvatarImage, AvatarFallback } from "@/components/ui/avatar";
 import { Progress } from "@/components/ui/progress";
 import { uploadFileWithProgress } from "@/lib/upload-xhr";
+import { AvatarCropDialog } from "@/components/pet/AvatarCropDialog";
 
 /**
  * AvatarUpload — five-state upload zone for pet avatars.
@@ -17,10 +18,12 @@ import { uploadFileWithProgress } from "@/lib/upload-xhr";
  *
  * Upload flow (Architecture constraint — image bytes never pass through Next.js API):
  * 1. File validated client-side (size <= 10MB, type jpeg/png/webp)
- * 2. media.getPresignedUrl tRPC mutation → { presignedUrl, key }
- * 3. XMLHttpRequest PUT directly to the Supabase Storage presigned URL (tracks upload progress)
- * 4. media.confirmUpload tRPC mutation → writes avatarKey to Pet DB row
- * 5. CDN URL constructed and displayed; onUploadComplete callback fired
+ * 2. AvatarCropDialog opens (circular crop + zoom) — canvas re-encodes the
+ *    selected region to the original file's mime type before upload
+ * 3. media.getPresignedUrl tRPC mutation → { presignedUrl, key }
+ * 4. XMLHttpRequest PUT directly to the Supabase Storage presigned URL (tracks upload progress)
+ * 5. media.confirmUpload tRPC mutation → writes avatarKey to Pet DB row
+ * 6. CDN URL constructed and displayed; onUploadComplete callback fired
  *
  * Security:
  * - No Supabase Storage credentials in this client component (T-4-03)
@@ -59,6 +62,9 @@ export function AvatarUpload({
   const [localAvatarUrl, setLocalAvatarUrl] = useState<string | null>(
     currentAvatarUrl ?? null
   );
+  const [pendingCrop, setPendingCrop] = useState<{ file: File; objectUrl: string } | null>(
+    null
+  );
 
   const getPresignedUrlMutation = useMutation({
     ...trpc.media.getPresignedUrl.mutationOptions(),
@@ -79,24 +85,13 @@ export function AvatarUpload({
 
   const uploadFile = useCallback(
     async (file: File) => {
-      // Disabled state guard — petId not yet available (create mode)
+      // Type-narrowing guard — selectFile() already gates on petId before the
+      // crop dialog ever opens, so this only protects the TS type of petId.
       if (!petId) {
         toast.info(t("savePetFirst"));
         return;
       }
 
-      // Client-side validation: file size
-      if (file.size > MAX_FILE_SIZE) {
-        handleError(t("fileTooLarge"));
-        return;
-      }
-
-      // Client-side validation: file type
-      if (!ALLOWED_TYPES.includes(file.type as AllowedContentType)) {
-        handleError(t("invalidType"));
-        return;
-      }
-
       setUploadState("uploading");
       setUploadProgress(0);
       setErrorMessage(null);
@@ -143,16 +138,55 @@ export function AvatarUpload({
     ]
   );
 
+  // Validates a freshly picked/dropped file and opens the crop dialog —
+  // the actual upload only fires once the user confirms a crop.
+  const selectFile = useCallback(
+    (file: File) => {
+      if (!petId) {
+        toast.info(t("savePetFirst"));
+        return;
+      }
+      if (file.size > MAX_FILE_SIZE) {
+        handleError(t("fileTooLarge"));
+        return;
+      }
+      if (!ALLOWED_TYPES.includes(file.type as AllowedContentType)) {
+        handleError(t("invalidType"));
+        return;
+      }
+      setPendingCrop({ file, objectUrl: URL.createObjectURL(file) });
+    },
+    [petId, t, handleError]
+  );
+
+  const closeCrop = useCallback(() => {
+    if (pendingCrop) URL.revokeObjectURL(pendingCrop.objectUrl);
+    setPendingCrop(null);
+  }, [pendingCrop]);
+
+  const handleCropped = useCallback(
+    (blob: Blob) => {
+      if (!pendingCrop) return;
+      const croppedFile = new File([blob], pendingCrop.file.name, {
+        type: pendingCrop.file.type,
+      });
+      URL.revokeObjectURL(pendingCrop.objectUrl);
+      setPendingCrop(null);
+      void uploadFile(croppedFile);
+    },
+    [pendingCrop, uploadFile]
+  );
+
   const handleFileChange = useCallback(
     (event: React.ChangeEvent<HTMLInputElement>) => {
       const file = event.target.files?.[0];
       if (file) {
-        void uploadFile(file);
+        selectFile(file);
       }
       // Reset input so same file can be re-selected after error
       event.target.value = "";
     },
-    [uploadFile]
+    [selectFile]
   );
 
   const handleClick = useCallback(() => {
@@ -181,10 +215,10 @@ export function AvatarUpload({
       setUploadState("idle");
       const file = event.dataTransfer.files[0];
       if (file) {
-        void uploadFile(file);
+        selectFile(file);
       }
     },
-    [uploadFile]
+    [selectFile]
   );
 
   // Hidden file input — triggers when zone is clicked
@@ -288,6 +322,14 @@ export function AvatarUpload({
             {errorMessage}
           </p>
         )}
+        {pendingCrop && (
+          <AvatarCropDialog
+            imageSrc={pendingCrop.objectUrl}
+            mimeType={pendingCrop.file.type}
+            onCancel={closeCrop}
+            onCropped={handleCropped}
+          />
+        )}
       </div>
     );
   }
@@ -326,6 +368,14 @@ export function AvatarUpload({
           {errorMessage}
         </p>
       )}
+      {pendingCrop && (
+        <AvatarCropDialog
+          imageSrc={pendingCrop.objectUrl}
+          mimeType={pendingCrop.file.type}
+          onCancel={closeCrop}
+          onCropped={handleCropped}
+        />
+      )}
     </div>
   );
 }