export const dynamic = "force-dynamic";

import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { getIsoMeta, getIsoIntroSegments } from "@/lib/iso";
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";

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

export default async function IsoPage() {
  const meta = await getIsoMeta();
  if (!meta) notFound();

  const introSegments = await getIsoIntroSegments();

  const frontPages = introSegments.find((s) => s.slug === "front-pages");
  const introduction = introSegments.find((s) => s.slug === "introduction");
  const aboutAuthor = introSegments.find((s) => s.slug === "about-the-author");

  // Invocation is mantra 0, mantras are 1-18
  const invocation = meta.mantras.find((m) => m.number === 0);
  const numberedMantras = meta.mantras.filter((m) => m.number > 0);

  return (
    <div className="min-h-screen bg-background">
      <JsonLd data={bookJsonLd({ path: "/books/iso", name: "Śrī Īśopaniṣad" })} />
      <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">
          {meta.title}
        </h1>
        <p className="mt-1 text-muted-foreground">{meta.author}</p>
      </PageHeader>

      <main className="max-w-5xl mx-auto px-6 py-8 space-y-8">
        {/* Description */}
        {meta.description && (
          <p className="text-muted-foreground">{meta.description}</p>
        )}

        {/* Front Matter */}
        {(frontPages || introduction) && (
          <div>
            <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
              Front Matter
            </h2>
            <Card className="divide-y divide-border">
              <CardContent className="p-0">
                <ul className="divide-y divide-border">
                  {frontPages && (
                    <li>
                      <Link
                        href="/books/iso/intro-front-pages"
                        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>
                          <p className="font-medium text-foreground">
                            {frontPages.title}
                          </p>
                        </div>
                        <span className="text-sm text-muted-foreground sm:shrink-0 sm:ml-4">
                        </span>
                      </Link>
                    </li>
                  )}
                  {introduction && (
                    <li>
                      <Link
                        href="/books/iso/intro-introduction"
                        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>
                          <p className="font-medium text-foreground">
                            {introduction.title}
                          </p>
                        </div>
                        <span className="text-sm text-muted-foreground sm:shrink-0 sm:ml-4">
                        </span>
                      </Link>
                    </li>
                  )}
                </ul>
              </CardContent>
            </Card>
          </div>
        )}

        {/* Mantras */}
        <div>
          <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
            Mantras
          </h2>
          <Card className="divide-y divide-border">
            <CardContent className="p-0">
              <ul className="divide-y divide-border">
                {/* Invocation */}
                {invocation && (
                  <li>
                    <Link
                      href="/books/iso/invocation"
                      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>
                        <span className="text-sm text-primary font-medium">
                          Invocation
                        </span>
                        <p className="font-medium text-foreground">
                          {invocation.title}
                        </p>
                      </div>
                    </Link>
                  </li>
                )}

                {/* Mantras 1-18 */}
                {numberedMantras.map((m) => (
                  <li key={m.number}>
                    <Link
                      href={`/books/iso/${m.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>
                        <span className="text-sm text-primary font-medium">
                          Mantra {m.number}
                        </span>
                        <p className="font-medium text-foreground">{m.title}</p>
                      </div>
                    </Link>
                  </li>
                ))}
              </ul>
            </CardContent>
          </Card>
        </div>

        {/* About the Author */}
        {aboutAuthor && (
          <div>
            <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
              About the Author
            </h2>
            <Card className="divide-y divide-border">
              <CardContent className="p-0">
                <ul className="divide-y divide-border">
                  <li>
                    <Link
                      href="/books/iso/intro-about-the-author"
                      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>
                        <p className="font-medium text-foreground">
                          {aboutAuthor.title}
                        </p>
                      </div>
                      <span className="text-sm text-muted-foreground sm:shrink-0 sm:ml-4">
                      </span>
                    </Link>
                  </li>
                </ul>
              </CardContent>
            </Card>
          </div>
        )}
      </main>
    </div>
  );
}