Feat: Implement infinite scrolling brewery comment section

Refactor beer comment schemas to work on brewery comments as well. Add robots.txt to block crawling for now.

src/components/ui/CommentsComponent.tsx

@@ -0,0 +1,114 @@
+import { FC, MutableRefObject } from 'react';
+import { FaArrowUp } from 'react-icons/fa';
+import { mutate } from 'swr';
+import { useInView } from 'react-intersection-observer';
+
+import useBeerPostComments from '@/hooks/useBeerPostComments';
+import useBreweryPostComments from '@/hooks/useBreweryPostComments';
+import NoCommentsCard from '../BeerById/NoCommentsCard';
+import LoadingComponent from '../BeerById/LoadingComponent';
+import CommentCardBody from '../BeerById/CommentCardBody';
+
+interface CommentsComponentProps {
+  commentSectionRef: MutableRefObject<HTMLDivElement | null>;
+  pageSize: number;
+  size: ReturnType<typeof useBeerPostComments | typeof useBreweryPostComments>['size'];
+  setSize: ReturnType<
+    typeof useBeerPostComments | typeof useBreweryPostComments
+  >['setSize'];
+  comments: ReturnType<
+    typeof useBeerPostComments | typeof useBreweryPostComments
+  >['comments'];
+  isAtEnd: ReturnType<
+    typeof useBeerPostComments | typeof useBreweryPostComments
+  >['isAtEnd'];
+  isLoadingMore: ReturnType<
+    typeof useBeerPostComments | typeof useBreweryPostComments
+  >['isLoadingMore'];
+}
+
+const CommentsComponent: FC<CommentsComponentProps> = ({
+  commentSectionRef,
+  comments,
+  isAtEnd,
+  isLoadingMore,
+  pageSize,
+  setSize,
+  size,
+}) => {
+  const { ref: lastCommentRef } = useInView({
+    /**
+     * When the last comment comes into view, call setSize from useBeerPostComments to
+     * load more comments.
+     */
+    onChange: (visible) => {
+      if (!visible || isAtEnd) return;
+      setSize(size + 1);
+    },
+  });
+
+  return (
+    <>
+      {!!comments.length && (
+        <div className="card bg-base-300 pb-6">
+          {comments.map((comment, index) => {
+            const isPenulitmateComment = index === comments.length - 2;
+
+            /**
+             * Attach a ref to the last comment in the list. When it comes into view, the
+             * component will call setSize to load more comments.
+             */
+            return (
+              <div
+                ref={isPenulitmateComment ? lastCommentRef : undefined}
+                key={comment.id}
+              >
+                <CommentCardBody comment={comment} mutate={mutate} />
+              </div>
+            );
+          })}
+
+          {
+            /**
+             * If there are more comments to load, show a loading component with a
+             * skeleton loader and a loading spinner.
+             */
+            !!isLoadingMore && <LoadingComponent length={pageSize} />
+          }
+
+          {
+            /**
+             * If the user has scrolled to the end of the comments, show a button that
+             * will scroll them back to the top of the comments section.
+             */
+            !!isAtEnd && (
+              <div className="flex h-20 items-center justify-center text-center">
+                <div
+                  className="tooltip tooltip-bottom"
+                  data-tip="Scroll back to top of comments."
+                >
+                  <button
+                    type="button"
+                    className="btn-ghost btn-sm btn"
+                    aria-label="Scroll back to top of comments"
+                    onClick={() => {
+                      commentSectionRef.current?.scrollIntoView({
+                        behavior: 'smooth',
+                      });
+                    }}
+                  >
+                    <FaArrowUp />
+                  </button>
+                </div>
+              </div>
+            )
+          }
+        </div>
+      )}
+
+      {!comments.length && <NoCommentsCard />}
+    </>
+  );
+};
+
+export default CommentsComponent;