import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { getBookMeta } from "@/lib/api";
import { ogForBook } from "@/lib/og";
import { PageHeader } from "@/components/layout/page-header";
import { JsonLd } from "@/components/seo/json-ld";
import { bookJsonLd } from "@/lib/jsonld";
import { Card, CardContent } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";

type VolumeInfo = {
  number: number;
  totalChapters: number;
};

export function generateMetadata(): Metadata {
  return ogForBook("kb");
}

export default async function KbPage() {
  const meta = await getBookMeta("kb");
  if (!meta) notFound();

  const title = meta.title as string;
  const author = meta.author as string;
  const description = meta.description as string | undefined;
  const volumes = meta.volumes as VolumeInfo[];

  return (
    <div className="min-h-screen bg-background">
      <JsonLd data={bookJsonLd({ path: "/books/kb", name: "Kṛṣṇa, The Supreme Personality of Godhead" })} />
      <PageHeader>
        <Link
          href="/books"
          className="text-sm text-muted-foreground hover:text-foreground transition-colors"
        >
          &larr; Books
        </Link>
        <h1 className="mt-3 text-3xl font-bold text-foreground">{title}</h1>
        <p className="mt-1 text-muted-foreground">{author}</p>
      </PageHeader>
      <main className="max-w-5xl mx-auto px-6 py-8">
        {description && (
          <p className="text-muted-foreground mb-6">{description}</p>
        )}
        <Card className="divide-y divide-border">
          <CardContent className="p-0">
            <ul className="divide-y divide-border">
              {volumes.map((vol) => (
                <li key={vol.number}>
                  <Link
                    href={`/books/kb/${vol.number}`}
                    className="flex flex-col sm:flex-row sm:items-center sm:justify-between px-5 py-4 gap-1 sm:gap-0 hover:bg-muted transition-colors"
                  >
                    <div>
                      <Badge variant="secondary" className="mb-1">
                        Volume {vol.number}
                      </Badge>
                      <p className="font-medium text-foreground">
                        {vol.totalChapters} chapters
                      </p>
                    </div>
                  </Link>
                </li>
              ))}
            </ul>
          </CardContent>
        </Card>
      </main>
    </div>
  );
}