feat: Add NavPrevPost, NavNextPost

frontend/apps/service-site/.storybook/main.ts

@@ -18,6 +18,10 @@ const config: StorybookConfig = {
       config.resolve.alias = {
         ...config.resolve.alias,
         '@': path.resolve(__dirname, '../src'),
+        'contentlayer/generated': path.resolve(
+          __dirname,
+          '../.contentlayer/generated',
+        ),
       }
     }
     return config

frontend/apps/service-site/package.json

@@ -8,7 +8,7 @@
     "dev:css": "tcm src --watch",
     "dev:storybook": "storybook dev -h localhost -p 6006 --no-open",
     "build": "pnpm gen && next build",
-    "build:storybook": "storybook build",
+    "build:storybook": "pnpm gen && storybook build",
     "gen": "conc -c auto pnpm:gen:*",
     "gen:css": "tcm src",
     "gen:contentlayer": "contentlayer2 build",

frontend/apps/service-site/src/app/page.tsx

@@ -1,6 +1,5 @@
-import { fallbackLang } from '@/features/i18n'
 import { TopPage } from '@/features/top'
 
 export default function Page() {
-  return <TopPage lang={fallbackLang} />
+  return <TopPage />
 }

frontend/apps/service-site/src/app/posts/[slug]/page.tsx

@@ -24,5 +24,5 @@ const paramsSchema = object({
 export default function Page({ params }: PageProps) {
   const { slug } = parse(paramsSchema, params)
 
-  return <PostDetailPage lang={fallbackLang} slug={slug} />
+  return <PostDetailPage slug={slug} />
 }

frontend/apps/service-site/src/app/posts/page.tsx

@@ -1,6 +1,5 @@
-import { fallbackLang } from '@/features/i18n'
 import { PostListPage } from '@/features/posts'
 
 export default function Page() {
-  return <PostListPage lang={fallbackLang} />
+  return <PostListPage />
 }

frontend/apps/service-site/src/components/TopCards/TopCards.tsx

@@ -1,19 +1,20 @@
 import type { Lang } from '@/features/i18n'
+import { createPostDetailLink } from '@/features/posts'
 import type { Post } from 'contentlayer/generated'
 import Image from 'next/image'
 import Link from 'next/link'
 import styles from './TopCards.module.css'
 interface TopCardsProps {
   posts: Post[]
-  lang?: Lang
+  lang?: Lang | undefined
 }
 
 export function TopCards({ posts, lang }: TopCardsProps) {
   return (
     <div className={styles.topCards}>
       {posts.map((post) => (
         <Link
-          href={lang ? `/${lang}/posts/${post.slug}` : `/posts/${post.slug}`}
+          href={createPostDetailLink({ lang, slug: post.slug })}
           key={post.slug}
         >
           <div className={styles.topCard}>

frontend/apps/service-site/src/features/posts/components/NavNextPost/NavNextPost.module.css

@@ -0,0 +1,55 @@
+.wrapper {
+  display: grid;
+  grid-auto-flow: row;
+  gap: var(--spacing-2);
+}
+
+.label {
+  color: var(--global-body-text);
+  font-family: var(--main-font);
+  font-size: var(--font-size-2);
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .label {
+  color: var(--global-foreground);
+}
+
+.titleWrapper {
+  display: grid;
+  grid-auto-flow: column;
+  gap: var(--spacing-half);
+  justify-content: space-between;
+}
+
+.icon {
+  width: 1.25rem;
+  height: 1.25rem;
+  color: var(--global-foreground);
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .icon {
+  color: var(--primary-color);
+}
+
+.title {
+  display: -webkit-box;
+  overflow: hidden;
+  color: var(--global-foreground);
+  text-overflow: ellipsis;
+  font-family: var(--message-font);
+  font-size: var(--font-size-7);
+  line-height: 120%;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  line-clamp: 3;
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .title {
+  color: var(--primary-color);
+}

frontend/apps/service-site/src/features/posts/components/NavNextPost/NavNextPost.stories.tsx

@@ -0,0 +1,16 @@
+import type { Meta, StoryObj } from '@storybook/react'
+
+import { aPost } from '../../factories'
+import { NavNextPost } from './'
+
+const meta = {
+  component: NavNextPost,
+  args: {
+    post: aPost(),
+  },
+} satisfies Meta<typeof NavNextPost>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {}

frontend/apps/service-site/src/features/posts/components/NavNextPost/NavNextPost.tsx

@@ -0,0 +1,27 @@
+import type { Lang } from '@/features/i18n'
+import type { Post } from 'contentlayer/generated'
+import { ChevronRight } from 'lucide-react'
+import Link from 'next/link'
+import type { FC } from 'react'
+import { createPostDetailLink } from '../../utils'
+import styles from './NavNextPost.module.css'
+
+type Props = {
+  lang?: Lang | undefined
+  post: Post
+}
+
+export const NavNextPost: FC<Props> = ({ lang, post }) => {
+  return (
+    <Link
+      href={createPostDetailLink({ lang, slug: post.slug })}
+      className={styles.wrapper}
+    >
+      <span className={styles.label}>Next</span>
+      <div className={styles.titleWrapper}>
+        <span className={styles.title}>{post.title}</span>
+        <ChevronRight className={styles.icon} />
+      </div>
+    </Link>
+  )
+}

frontend/apps/service-site/src/features/posts/components/NavNextPost/index.ts

@@ -0,0 +1 @@
+export * from './NavNextPost'

frontend/apps/service-site/src/features/posts/components/NavPreviousPost/NavPreviousPost.module.css

@@ -0,0 +1,56 @@
+.wrapper {
+  display: grid;
+  grid-auto-flow: row;
+  gap: var(--spacing-2);
+}
+
+.label {
+  padding-left: var(--spacing-6);
+  color: var(--global-body-text);
+  font-family: var(--main-font);
+  font-size: var(--font-size-2);
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .label {
+  color: var(--global-foreground);
+}
+
+.titleWrapper {
+  display: grid;
+  grid-auto-flow: column;
+  gap: var(--spacing-half);
+  justify-content: flex-start;
+}
+
+.icon {
+  width: 1.25rem;
+  height: 1.25rem;
+  color: var(--global-foreground);
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .icon {
+  color: var(--primary-color);
+}
+
+.title {
+  display: -webkit-box;
+  overflow: hidden;
+  color: var(--global-foreground);
+  text-overflow: ellipsis;
+  font-family: var(--message-font);
+  font-size: var(--font-size-7);
+  line-height: 120%;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  line-clamp: 3;
+  transition: color var(--default-hover-animation-duration)
+    var(--default-timing-function);
+}
+
+.wrapper:hover .title {
+  color: var(--primary-color);
+}

frontend/apps/service-site/src/features/posts/components/NavPreviousPost/NavPreviousPost.stories.tsx

@@ -0,0 +1,16 @@
+import type { Meta, StoryObj } from '@storybook/react'
+
+import { aPost } from '../../factories'
+import { NavPreviousPost } from './'
+
+const meta = {
+  component: NavPreviousPost,
+  args: {
+    post: aPost(),
+  },
+} satisfies Meta<typeof NavPreviousPost>
+
+export default meta
+type Story = StoryObj<typeof meta>
+
+export const Default: Story = {}

frontend/apps/service-site/src/features/posts/components/NavPreviousPost/NavPreviousPost.tsx

@@ -0,0 +1,27 @@
+import type { Lang } from '@/features/i18n'
+import type { Post } from 'contentlayer/generated'
+import { ChevronLeft } from 'lucide-react'
+import Link from 'next/link'
+import type { FC } from 'react'
+import { createPostDetailLink } from '../../utils'
+import styles from './NavPreviousPost.module.css'
+
+type Props = {
+  lang?: Lang | undefined
+  post: Post
+}
+
+export const NavPreviousPost: FC<Props> = ({ lang, post }) => {
+  return (
+    <Link
+      href={createPostDetailLink({ lang, slug: post.slug })}
+      className={styles.wrapper}
+    >
+      <span className={styles.label}>Previous</span>
+      <div className={styles.titleWrapper}>
+        <ChevronLeft className={styles.icon} />
+        <span className={styles.title}>{post.title}</span>
+      </div>
+    </Link>
+  )
+}

frontend/apps/service-site/src/features/posts/components/NavPreviousPost/index.ts

@@ -0,0 +1 @@
+export * from './NavPreviousPost'

frontend/apps/service-site/src/features/posts/components/PostDetailPage/PostDetailPage.module.css

@@ -0,0 +1,29 @@
+.navPostWrapper {
+  display: grid;
+  grid-template-rows: auto auto;
+  gap: var(--spacing-8);
+}
+
+.navPrev {
+  grid-area: 0 / 2;
+}
+
+.navNext {
+  grid-area: 0 / 2;
+}
+
+@media screen and (min-width: 768px) {
+  .navPostWrapper {
+    grid-template-columns: 1fr 1fr;
+    grid-template-rows: none;
+    gap: var(--spacing-10);
+  }
+
+  .navPrev {
+    grid-area: 0 / 1;
+  }
+
+  .navNext {
+    grid-area: 1 / 2;
+  }
+}

frontend/apps/service-site/src/features/posts/components/PostDetailPage/PostDetailPage.tsx

@@ -1,30 +1,48 @@
-import type { Lang } from '@/features/i18n'
+import { type Lang, fallbackLang } from '@/features/i18n'
 import { LinkHeading } from '@/features/posts/components/LinkHeading'
 import { PostHero } from '@/features/posts/components/PostHero'
 import { MDXContent } from '@/libs/contentlayer'
 import { notFound } from 'next/navigation'
 import type { FC } from 'react'
-import { findPostByLangAndSlug } from '../../utils'
+import { findPostByLangAndSlug, getNextPost, getPrevPost } from '../../utils'
+import { NavNextPost } from '../NavNextPost'
+import { NavPreviousPost } from '../NavPreviousPost'
 import { TableOfContents } from '../TableOfContents'
+import styles from './PostDetailPage.module.css'
 
 const TOC_TARGET_CLASS_NAME = 'target-toc'
 
 type Props = {
-  lang: Lang
+  lang?: Lang
   slug: string
 }
 
 export const PostDetailPage: FC<Props> = ({ lang, slug }) => {
-  const post = findPostByLangAndSlug({ lang, slug })
+  const post = findPostByLangAndSlug({ lang: lang ?? fallbackLang, slug })
   if (!post) notFound()
 
+  const prevPost = getPrevPost({ lang: lang ?? fallbackLang, targetPost: post })
+  const nextPost = getNextPost({ lang: lang ?? fallbackLang, targetPost: post })
+
   return (
     <article className={TOC_TARGET_CLASS_NAME} style={{ padding: '0 120px' }}>
       <PostHero post={post} />
       <TableOfContents contentSelector={TOC_TARGET_CLASS_NAME} />
       {/* FIXME: Add href props after implementing categories single page */}
       <LinkHeading href="/">Categories</LinkHeading>
       <MDXContent code={post.body.code} />
+      <div className={styles.navPostWrapper}>
+        {prevPost && (
+          <div className={styles.navPrev}>
+            <NavPreviousPost lang={lang} post={prevPost} />
+          </div>
+        )}
+        {nextPost && (
+          <div className={styles.navNext}>
+            <NavNextPost lang={lang} post={nextPost} />
+          </div>
+        )}
+      </div>
     </article>
   )
 }