Fix: Update page count calc

src/components/BeerStyleById/BeerStyleBeerSection.tsx

@@ -0,0 +1,100 @@
+import Link from 'next/link';
+import { FC, MutableRefObject, useRef } from 'react';
+import { useInView } from 'react-intersection-observer';
+import { z } from 'zod';
+
+import BeerStyleQueryResult from '@/services/BeerStyles/schema/BeerStyleQueryResult';
+import useBeerPostsByBeerStyle from '@/hooks/data-fetching/beer-posts/useBeerPostsByBeerStyles';
+import BeerRecommendationLoadingComponent from '../BeerById/BeerRecommendationLoadingComponent';
+
+interface BeerStyleBeerSectionProps {
+  beerStyle: z.infer<typeof BeerStyleQueryResult>;
+}
+
+const BeerStyleBeerSection: FC<BeerStyleBeerSectionProps> = ({ beerStyle }) => {
+  const PAGE_SIZE = 2;
+
+  const { beerPosts, isAtEnd, isLoadingMore, setSize, size } = useBeerPostsByBeerStyle({
+    beerStyleId: beerStyle.id,
+    pageSize: PAGE_SIZE,
+  });
+  const { ref: penultimateBeerPostRef } = useInView({
+    /**
+     * When the last beer post comes into view, call setSize from useBeerPostsByBeerStyle
+     * to load more beer posts.
+     */
+    onChange: (visible) => {
+      if (!visible || isAtEnd) return;
+      setSize(size + 1);
+    },
+  });
+
+  const beerRecommendationsRef: MutableRefObject<HTMLDivElement | null> = useRef(null);
+
+  return (
+    <div className="card h-full" ref={beerRecommendationsRef}>
+      <div className="card-body">
+        <>
+          <div className="my-2 flex flex-row items-center justify-between">
+            <div>
+              <h3 className="text-3xl font-bold">Brews</h3>
+            </div>
+          </div>
+
+          {!!beerPosts.length && (
+            <div className="space-y-5">
+              {beerPosts.map((beerPost, index) => {
+                const isPenultimateBeerPost = index === beerPosts.length - 2;
+
+                /**
+                 * Attach a ref to the second last beer post in the list. When it comes
+                 * into view, the component will call setSize to load more beer posts.
+                 */
+
+                return (
+                  <div
+                    ref={isPenultimateBeerPost ? penultimateBeerPostRef : undefined}
+                    key={beerPost.id}
+                  >
+                    <div>
+                      <Link className="link-hover link" href={`/beers/${beerPost.id}`}>
+                        <span className="text-xl font-semibold">{beerPost.name}</span>
+                      </Link>
+                    </div>
+                    <div>
+                      <Link
+                        className="link-hover link"
+                        href={`/breweries/${beerPost.brewery.id}`}
+                      >
+                        <span className="text-xl font-semibold">
+                          {beerPost.brewery.name}
+                        </span>
+                      </Link>
+                    </div>
+
+                    <div className="space-x-2">
+                      <span>{beerPost.abv}% ABV</span>
+                      <span>{beerPost.ibu} IBU</span>
+                    </div>
+                  </div>
+                );
+              })}
+            </div>
+          )}
+
+          {
+            /**
+             * If there are more beer posts to load, show a loading component with a
+             * skeleton loader and a loading spinner.
+             */
+            !!isLoadingMore && !isAtEnd && (
+              <BeerRecommendationLoadingComponent length={PAGE_SIZE} />
+            )
+          }
+        </>
+      </div>
+    </div>
+  );
+};
+
+export default BeerStyleBeerSection;