export const dynamic = "force-dynamic";

import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { getTlcMeta, getTlcIntroSegments } from "@/lib/tlc";
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("tlc");
}

const PART_LABELS: Record<number, string> = {
  1: "Part I",
  2: "Part II",
};

export default async function TlcPage() {
  const meta = await getTlcMeta();
  if (!meta) notFound();

  const introSegments = await getTlcIntroSegments();

  return (
    <div className="min-h-screen bg-background">
      <JsonLd data={bookJsonLd({ path: "/books/tlc", name: "Teachings of Lord Caitanya" })} />
      <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-sm text-muted-foreground italic">
          {meta.subtitle}
        </p>
        <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 */}
        {introSegments && introSegments.length > 0 && (
          <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">
                  {introSegments.map((seg) => (
                    <li key={seg.slug}>
                      <Link
                        href={`/books/tlc/${seg.slug}`}
                        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">
                            {seg.title}
                          </p>
                        </div>
                        <span className="text-sm text-muted-foreground sm:shrink-0 sm:ml-4">
                        </span>
                      </Link>
                    </li>
                  ))}
                </ul>
              </CardContent>
            </Card>
          </div>
        )}

        {/* Parts & Chapters */}
        {meta.parts.map((part) => {
          const partChapters = part.chapters
            .map((num) => meta.chapters.find((ch) => ch.number === num))
            .filter(Boolean) as { number: number; title: string }[];

          return (
            <div key={part.number}>
              <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
                {PART_LABELS[part.number] ?? `Part ${part.number}`}
              </h2>
              <Card className="divide-y divide-border">
                <CardContent className="p-0">
                  <ul className="divide-y divide-border">
                    {partChapters.map((ch) => (
                      <li key={ch.number}>
                        <Link
                          href={`/books/tlc/${ch.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">
                              Chapter {ch.number}
                            </span>
                            <p className="font-medium text-foreground">
                              {ch.title}
                            </p>
                          </div>
                        </Link>
                      </li>
                    ))}
                  </ul>
                </CardContent>
              </Card>
            </div>
          );
        })}
      </main>
    </div>
  );
}