import clsx from "clsx";
import Link from "next/link";
import { useContext, useMemo } from "react";
import { useRouter } from "next/router";
import { GetServerSideProps } from "next";

import { get } from "libs/http";
import useGet from "libs/hooks/useGet";
import { Context } from "libs/context";
import NovelItem from "components/NovelItem";

import styles from "styles/genre.module.scss";
import useStore from "libs/hooks/useStore";
import { SeoHead, SeoHeadConfig } from "components/SeoHead";

const Genre = () => {
  const { query } = useRouter();
  const { siteConfig } = useStore();
  const { data } = useGet<ListItem[]>(
    query.genre ? `/api/genre/${query.genre}` : "/api/list"
  );
  const store = useContext(Context);
  const currentName = useMemo(() => {
    const item = store.genre.find((item) => item.uri === query.genre);
    return item ? item.name : "All";
  }, [query.genre, store.genre]);

  const seoConfig: SeoHeadConfig = useMemo(() => {
    // const genreName =
    return {
      title: `${currentName} Novels - ${siteConfig.siteName}`,
      description: `Explore ${currentName} Web Novels on NovelDit. Online Reading ${currentName} Web Novels for Free!`,
      keywords: `${[
        `${currentName} stories`,
        `${currentName} novels`,
        `read ${currentName} novels`,
        siteConfig.keywords,
        siteConfig.siteName,
      ].join(", ")}`,
      url: `https://${siteConfig.host}/novels${
        query.genre ? `/${query.genre}` : ""
      }`,
      jsonLd: JSON.stringify([
        {
          "@context": "https://schema.org",
          "@type": "BreadcrumbList",
          itemListElement: [
            {
              "@type": "ListItem",
              position: 1,
              name: "Home",
              item: `https://${siteConfig.host}`,
            },
            {
              "@type": "ListItem",
              position: 2,
              name: "All Novels",
              item: `https://${siteConfig.host}/novels`,
            },
            ...(query.genre
              ? [
                  {
                    "@type": "ListItem",
                    position: 3,
                    name: `${currentName} Novels`,
                    item: `https://${siteConfig.host}/novels/${query.genre}`,
                  },
                ]
              : []),
          ],
        },
        {
          "@context": "https://schema.org",
          "@type": "ItemList",
          itemListElement: (data?.data || []).map((item, idx) => ({
            "@type": "ListItem",
            position: idx + 1,
            url: `https://${siteConfig.host}/novel/${item.uri}`,
            name: item.name,
            image:
              "http://img.webnovel.com/bookcover/16709365405930105/600/600.jpg",
            author: { "@type": "Person", name: item.author },
            publisher: { "@type": "Organization", name: siteConfig.siteName },
          })),
        },
        ...siteConfig.jsonLd,
      ]),
    };
  }, [
    currentName,
    data?.data,
    query.genre,
    siteConfig.host,
    siteConfig.jsonLd,
    siteConfig.keywords,
    siteConfig.siteName,
  ]);

  return (
    <main className="container">
      <SeoHead seoConfig={seoConfig} />
      <h2 className="novel-title">Genres</h2>
      <div className={styles.genres}>
        <Link
          href="/novels"
          title="All novels"
          className={clsx(styles.genre, {
            [styles.current]: !query.genre,
          })}
        >
          All
        </Link>
        {store.genre.map((item) => (
          <Link
            href={`/novels/${item.uri}`}
            key={item.uri}
            title={item.name}
            className={clsx(styles.genre, {
              [styles.current]: query.genre === item.uri,
            })}
          >
            {item.name}
          </Link>
        ))}
      </div>
      <h2 className="novel-title">{`${currentName} Novels`}</h2>
      <ul className="novel-list">
        {(data?.data || []).map((item) => (
          <NovelItem
            key={item.uri}
            slug={item.uri}
            img={item.img}
            name={item.name}
          />
        ))}
      </ul>
    </main>
  );
};

export const getServerSideProps: GetServerSideProps<
  { fallback: Docs },
  { genre: string }
> = async ({ params }) => {
  const key = params?.genre ? `/api/genre/${params.genre}` : `/api/list`;
  const data = await get(key);

  return {
    props: {
      fallback: {
        [key]: data,
      },
    },
  };
};

export default Genre;