import { useRouter } from "next/router";
import ErrorPage from "next/error";
import Container from "../../components/container";
import PostBody from "../../components/post-body";
import MoreStories from "../../components/more-stories";
import Header from "../../components/header";
import PostHeader from "../../components/post-header";
import SectionSeparator from "../../components/section-separator";
import Layout from "../../components/layout";
import {
  getAllPostSlugs,
  getPostBySlug,
  getMorePostsForSlug,
} from "../../lib/api";
import PostTitle from "../../components/post-title";
import Head from "next/head";
import { CMS_NAME } from "../../lib/constants";
import { Post as PostModel } from "@/viewmodels/post";

type PostProps = {
  post: PostModel;
  morePosts: Array<PostModel>;
  preview: boolean;
};

export default function Post({ post, morePosts = [], preview }: PostProps) {
  const router = useRouter();
  if (!router.isFallback && !post?.slug) {
    return <ErrorPage statusCode={404} />;
  }
  return (
    <Layout preview={preview}>
      <Container>
        <Header />
        {router.isFallback ? (
          <PostTitle title="Loading..."></PostTitle>
        ) : (
          <>
            <article className="mb-32">
              <Head>
                <title>
                  {`${post.title} | Next.js Blog Example with ${CMS_NAME}`}
                </title>
                <meta property="og:image" content={post.coverImage} />
              </Head>
              <PostHeader
                title={post.title}
                coverImage={post.coverImage}
                date={post.date}
                author={post.author}
              />
              <PostBody content={post.content} />
            </article>
            <SectionSeparator />
            {morePosts.length > 0 && <MoreStories posts={morePosts} />}
          </>
        )}
      </Container>
    </Layout>
  );
}

type StaticProps = {
  params: {
    slug: string;
  };
  preview: boolean | null;
};

export async function getStaticProps({ params, preview = null }: StaticProps) {
  return await Promise.all([
    getPostBySlug(params.slug, preview ?? false),
    getMorePostsForSlug(params.slug, preview ?? false),
  ]).then((values) => ({
    props: {
      post: values[0],
      morePosts: values[1],
      preview,
    },
  }));
}

export async function getStaticPaths() {
  const slugs = await getAllPostSlugs();
  return {
    paths: slugs.map(
      (slug) =>
        ({
          params: {
            slug,
          },
        }) || [],
    ),
    fallback: false,
  };
}
