optimization

Virtualization for the card list -> Faster loading when searching

package-lock.json

@@ -9,7 +9,9 @@
       "version": "0.0.0",
       "dependencies": {
         "react": "^19.2.4",
-        "react-dom": "^19.2.4"
+        "react-dom": "^19.2.4",
+        "react-virtuoso": "^4.18.3",
+        "react-window": "^2.2.7"
       },
       "devDependencies": {
         "@eslint/js": "^9.39.4",
@@ -1491,9 +1493,9 @@
       }
     },
     "node_modules/flatted": {
-      "version": "3.4.1",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.1.tgz",
-      "integrity": "sha512-IxfVbRFVlV8V/yRaGzk0UVIcsKKHMSfYw66T/u4nTwlWteQePsxe//LjudR1AMX4tZW3WFCh3Zqa/sjlqpbURQ==",
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.2.tgz",
+      "integrity": "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==",
       "dev": true,
       "license": "ISC"
     },
@@ -2253,6 +2255,26 @@
         "react": "^19.2.4"
       }
     },
+    "node_modules/react-virtuoso": {
+      "version": "4.18.3",
+      "resolved": "https://registry.npmjs.org/react-virtuoso/-/react-virtuoso-4.18.3.tgz",
+      "integrity": "sha512-fLz/peHAx4Eu0DLHurFEEI7Y6n5CqEoxBh04rgJM9yMuOJah2a9zWg/MUOmZLcp7zuWYorXq5+5bf3IRgkNvWg==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": ">=16 || >=17 || >= 18 || >= 19",
+        "react-dom": ">=16 || >=17 || >= 18 || >=19"
+      }
+    },
+    "node_modules/react-window": {
+      "version": "2.2.7",
+      "resolved": "https://registry.npmjs.org/react-window/-/react-window-2.2.7.tgz",
+      "integrity": "sha512-SH5nvfUQwGHYyriDUAOt7wfPsfG9Qxd6OdzQxl5oQ4dsSsUicqQvjV7dR+NqZ4coY0fUn3w1jnC5PwzIUWEg5w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",

package.json

@@ -11,7 +11,9 @@
   },
   "dependencies": {
     "react": "^19.2.4",
-    "react-dom": "^19.2.4"
+    "react-dom": "^19.2.4",
+    "react-virtuoso": "^4.18.3",
+    "react-window": "^2.2.7"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",

src/components/PrintingRow/PrintingRow.jsx

@@ -1,11 +1,13 @@
-import React, { useContext, useState, memo } from 'react';
+import React, { useContext, useState } from 'react';
 import { CardContext } from '../../store/CardContext';
 
 function PrintingRow({ card_id, printing }) {
   const { ownedAmounts, updateAmount } = useContext(CardContext);
   const [loading, setLoading] = useState(false);
 
-  const currentAmount = ownedAmounts[card_id]?.[printing.set_id]?.[printing.rarity_id] ?? printing.amount_owned ?? 0;
+  // Combined key for uniqueness
+  const key = `${printing.set_id}-${printing.rarity_id}`;
+  const currentAmount = ownedAmounts[card_id]?.[key] ?? printing.amount_owned ?? 0;
 
   const updateBackend = async (newAmount) => {
     const { set_id, rarity_id } = printing;
@@ -16,22 +18,39 @@ function PrintingRow({ card_id, printing }) {
       const response = await fetch('http://localhost:3000/collection/amount', {
         method: 'PUT',
         headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ card_id, set_id, rarity_id, amount_owned: newAmount })
+        body: JSON.stringify({
+          card_id,
+          set_id,
+          rarity_id,
+          amount_owned: newAmount
+        })
       });
 
       if (response.ok) {
-        updateAmount(card_id, set_id, rarity_id, newAmount);
+        // Update context using the combined key
+        updateAmount(card_id, key, newAmount);
       }
+    } catch (err) {
+      // silently fail
     } finally {
       setLoading(false);
     }
   };
 
   const increment = () => updateBackend(currentAmount + 1);
-  const decrement = () => { if (currentAmount > 0) updateBackend(currentAmount - 1); };
+  const decrement = () => {
+    if (currentAmount > 0) updateBackend(currentAmount - 1);
+  };
 
   return (
-    <div style={{ display: 'flex', justifyContent: 'space-between', padding: '0.25rem 0', opacity: loading ? 0.6 : 1 }}>
+    <div
+      style={{
+        display: 'flex',
+        justifyContent: 'space-between',
+        padding: '0.25rem 0',
+        opacity: loading ? 0.6 : 1
+      }}
+    >
       <span>{printing.set_name} {printing.rarity_name}</span>
       <div>
         <button onClick={decrement} disabled={loading || currentAmount === 0}>–</button>
@@ -42,4 +61,21 @@ function PrintingRow({ card_id, printing }) {
   );
 }
 
-export default memo(PrintingRow);
+// ✅ Memoize PrintingRow for performance
+export default React.memo(
+  PrintingRow,
+  (prevProps, nextProps) => {
+    // Re-render only if card_id changes or printing reference changes
+    // or if the current amount changed
+    const prevKey = `${prevProps.printing.set_id}-${prevProps.printing.rarity_id}`;
+    const nextKey = `${nextProps.printing.set_id}-${nextProps.printing.rarity_id}`;
+    const prevAmount = prevProps.printing.amount_owned;
+    const nextAmount = nextProps.printing.amount_owned;
+
+    return (
+      prevProps.card_id === nextProps.card_id &&
+      prevKey === nextKey &&
+      prevAmount === nextAmount
+    );
+  }
+);

src/pages/HomePage.jsx

@@ -1,4 +1,5 @@
 import React, { useEffect, useState, useContext } from 'react';
+import { Virtuoso } from 'react-virtuoso';
 import CardRow from '../components/CardRow/CardRow';
 import SearchBar from '../components/SearchBar/SearchBar';
 import { fetchCards } from '../services/api';
@@ -59,12 +60,16 @@ function HomePage() {
   return (
     <div style={{ display: 'flex', height: '100vh' }}>
       {/* Left panel: card list */}
-      <div style={{ flex: 2, borderRight: '1px solid #ccc', padding: '1rem', overflowY: 'auto' }}>
+      <div style={{ flex: 2, borderRight: '1px solid #ccc', padding: '1rem' }}>
         <h2>Card List</h2>
         <SearchBar searchTerm={searchTerm} setSearchTerm={setSearchTerm} />
-        {filteredCards.map(card => (
-          <CardRow key={card.id} card={card} />
-        ))}
+
+        {/* ✅ Virtualized list */}
+        <Virtuoso
+          style={{ height: 'calc(100vh - 100px)' }} // Adjust for header/search bar
+          data={filteredCards}
+          itemContent={(index, card) => <CardRow key={card.id} card={card} />}
+        />
       </div>
 
       {/* Right panel: card image */}