completely rewrite blog page

Co-authored-by: Pukimaa <me@pukima.site>

src/app/blog/[slug]/page.tsx

@@ -1,14 +1,16 @@
-import { defineQuery, PortableText } from "next-sanity";
+import { PortableText, defineQuery } from "next-sanity";
 import imageUrlBuilder from "@sanity/image-url";
-import type { SanityImageSource } from "@sanity/image-url/lib/types/types";
-import { client, sanityFetch } from "../../../sanity/client";
-import Link from "next/link";
-import Image from "next/image";
-import { Post, SanityImageAsset } from "@/sanity/sanity.types";
 import {getImageDimensions} from '@sanity/asset-utils'
+import type { SanityImageSource } from "@sanity/image-url/lib/types/types";
+import { client } from "@/sanity/client";
+import { sanityFetch } from '@/sanity/client';
+import Link from "next/link";
+import { Post, SanityImageAsset } from "@/sanity/sanity.types";
+import type { Metadata } from "next";
+import Image from 'next/image'
 
+const POSTS_QUERY = defineQuery(`*[_type == "post"]{ slug }`);
 const POST_QUERY = defineQuery(`*[_type == "post" && slug.current == $slug][0]`);
-const POSTS_QUERY = defineQuery(`*[_type == "post"]{slug}`)
 
 type PageParams = Promise<{
     slug: string;
@@ -22,30 +24,53 @@ const urlFor = (source: SanityImageSource) =>
 
 export async function generateStaticParams() {
     const posts: Post[] = (await sanityFetch({ query: POSTS_QUERY, stega: false, perspective: "published" })).data;
-  return posts.map((post) => ({ slug: post.slug?.current ?? null })).filter((post) => post.slug);
+    return posts.map((post) => ({
+        slug: post.slug?.current ?? ""
+    }))
 }
 
-export default async function PostPage(props: { params: PageParams }) {
-  const { slug } = await props.params;
-  
-  const post: Post = (await sanityFetch({ query: POST_QUERY, params: { slug } })).data;
-
-  if (!post) {
-    return (
-      <main>
-        <p>Post not found</p>
-      </main>
-    );
+export async function generateMetadata(props: { params: Promise<PageParams> }): Promise<Metadata> {
+  const params = await props.params;
+  const post: Post = (await sanityFetch({ query: POST_QUERY, params, stega: false })).data;
+  const ogImage = post.mainImage
+    ? urlFor(post.mainImage)?.width(550).height(310).url()
+    : null;
+  const firstBlock = post.body ? post.body[0] : undefined;
+  let description: string | undefined = undefined;
+  if (firstBlock && firstBlock._type === 'block' && firstBlock.children) {
+    description = firstBlock.children.map(child => child.text).join(" ");
   }
 
-  const postImageUrl = post.mainImage ? urlFor(post.mainImage)?.width(550).height(310).url() : null;
+  return {
+    title: post.title,
+    description,
+    openGraph: {
+      title: post.title,
+      description,
+      type: "article",
+      publishedTime: post.publishedAt,
+      url: `/blog/${post.slug}`,
+      images: [
+        {
+          url: ogImage ?? "",
+        },
+      ],
+    },
+    twitter: {
+      card: "summary_large_image",
+      title: post.title,
+      description,
+      images: ogImage ? [ogImage] : [],
+    },
+  };
+}
 
-  function dynamicHeight(originalHeight: number, originalWidth: number, isInline: boolean) {
+function dynamicHeight(originalHeight: number, originalWidth: number, isInline: boolean) {
     const targetWidth = isInline ? 100 : 768;
     return (targetWidth * originalHeight) / originalWidth;
 }
 
-  function PortableImage({ value, isInline }: { value: SanityImageAsset, isInline: boolean } ) {
+function PortableImage({ value, isInline }: { value: SanityImageAsset, isInline: boolean } ) {
   const {width, height} = getImageDimensions(value)
   console.log(isInline, width, height);
   return (
@@ -58,7 +83,7 @@ export default async function PostPage(props: { params: PageParams }) {
         .fit('max')
         .auto('format')
         .url()}
-        width={isInline ? (width >= 100 ? 100 : width) : (width >= 768 ? 768 : width)}
+      width={isInline ? (width >= 100 ? 768 : width) : (width >= 768 ? 768 : width)}
       height={dynamicHeight(height, width, isInline)}
       alt={value.altText || ' '}
       loading="lazy"
@@ -69,31 +94,40 @@ export default async function PostPage(props: { params: PageParams }) {
       }}
     />
   )
-  }
+}
 
-  const components = {
+const components = {
     types: {
         image: PortableImage
     }
-  }
+}
+
+export default async function PostPage(props: { params: Promise<PageParams> }) {
+  const params = await props.params;
+  const post: Post = (await sanityFetch({ query: POST_QUERY, params })).data;
+  const postImageUrl = post.mainImage
+    ? urlFor(post.mainImage)?.width(912).height(576).url()
+    : null;
 
   return (
     <main className="container mx-auto min-h-screen max-w-3xl p-8 flex flex-col gap-4">
         <Link href="/blog" className="hover:underline">
-        ← Blog
+            ← Back to posts
         </Link>
         {postImageUrl && (
             <Image
                 src={postImageUrl}
-          alt={`Banner for ${post.title}` }
-          className="aspect-video rounded-xl"
-          width="550"
-          height="310"
+                alt={post.title ?? `Blog Post Banner Image for ${post.title}`}
+                className="aspect-video rounded-xl w-full"
+                width="912"
+                height="576"
             />
         )}
         <h1 className="text-4xl font-bold mb-8">{post.title}</h1> 
-      <div className="prose">
-        <p>Published: {new Date(post.publishedAt ?? "").toISOString().substring(0, 10)}</p>
+        <p className="text-sm text-neutral-600 dark:text-neutral-400 max-w-full w-fit">
+            {post.publishedAt}
+        </p>
+        <div className="items-start mt-2 mb-8 text-sm prose dark:prose-invert max-w-full w-full text-left">
             {Array.isArray(post.body) && <PortableText value={post.body} components={ components } />}
         </div>
     </main>