import { Typography } from "@/components/typography";
import { buttonVariants } from "@/components/ui/button";
import { Author, getAllBlogStaticPaths, getBlogForSlug } from "@/lib/markdown";
import { ArrowLeftIcon } from "lucide-react";
import Link from "next/link";
import { notFound } from "next/navigation";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { formatDate } from "@/lib/utils";
import { ScrollToTop } from "@/components/scroll-to-top";

type PageProps = {
  params: { slug: string };
};

export async function generateMetadata({ params: { slug } }: PageProps) {
  const res = await getBlogForSlug(slug);
  if (!res) return null;
  const { frontmatter } = res;
  return {
    title: frontmatter.title,
    description: frontmatter.description,
  };
}

export async function generateStaticParams() {
  const val = await getAllBlogStaticPaths();
  if (!val) return [];
  return val.map((it) => ({ slug: it }));
}

export default async function BlogPage({ params: { slug } }: PageProps) {
  const res = await getBlogForSlug(slug);
  if (!res) notFound();
  return (
    <div className="lg:w-[60%] sm:[95%] md:[75%] mx-auto">
      <Link
        className={buttonVariants({
          variant: "link",
          className: "!mx-0 !px-0 mb-7 !-ml-1 ",
        })}
        href="/blog"
      >
        <ArrowLeftIcon className="w-4 h-4 mr-1.5" /> Back to blog
      </Link>
      <div className="flex flex-col gap-3 pb-7 w-full mb-2">
        <p className="text-muted-foreground text-sm">
          {formatDate(res.frontmatter.date)}
        </p>
        <h1 className="sm:text-4xl text-3xl font-extrabold">
          {res.frontmatter.title}
        </h1>
        <div className="mt-6 flex flex-col gap-3">
          <p className="text-sm text-muted-foreground">Posted by</p>
          <Authors authors={res.frontmatter.authors} />
        </div>
      </div>
      <div className="!w-full">
        <Typography>{res.content}</Typography>
      </div>
        <ScrollToTop />
    </div>
  );
}

function Authors({ authors }: { authors: Author[] }) {
  return (
    <div className="flex items-center gap-8 flex-wrap">
      {authors.map((author) => {
        return (
          <Link
            href={author.handleUrl}
            className="flex items-center gap-2"
            key={author.username}
          >
            <Avatar className="w-10 h-10">
              <AvatarImage src={author.avatar} />
              <AvatarFallback>
                {author.username.slice(0, 2).toUpperCase()}
              </AvatarFallback>
            </Avatar>
            <div className="">
              <p className="text-sm font-medium">{author.username}</p>
              <p className="font-code text-[13px] text-muted-foreground">
                @{author.handle}
              </p>
            </div>
          </Link>
        );
      })}
    </div>
  );
}