export const dynamic = "force-dynamic";

import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { getPqpaMeta, getPqpaIntroSegments } from "@/lib/pqpa";
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("pqpa");
}

export default async function PqpaPage() {
  const meta = await getPqpaMeta();
  if (!meta) notFound();

  const introSegments = await getPqpaIntroSegments();

  // Split intro segments into front matter (order < 99) and back matter (order >= 99)
  const frontMatter = introSegments.filter((seg) => seg.order < 99);
  const backMatter = introSegments.filter((seg) => seg.order >= 99);

  return (
    <div className="min-h-screen bg-background">
      <JsonLd data={bookJsonLd({ path: "/books/pqpa", name: "Perfect Questions, Perfect Answers" })} />
      <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 */}
        {frontMatter.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">
                  {frontMatter.map((seg) => (
                    <li key={seg.slug}>
                      <Link
                        href={`/books/pqpa/${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>
        )}

        {/* Chapters */}
        <div>
          <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
            Chapters
          </h2>
          <Card className="divide-y divide-border">
            <CardContent className="p-0">
              <ul className="divide-y divide-border">
                {meta.chapters.map((ch) => (
                  <li key={ch.number}>
                    <Link
                      href={`/books/pqpa/${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>

        {/* Concluding Words */}
        <div>
          <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
            Conclusion
          </h2>
          <Card className="divide-y divide-border">
            <CardContent className="p-0">
              <ul className="divide-y divide-border">
                <li>
                  <Link
                    href="/books/pqpa/concluding-words"
                    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">
                        Concluding Words
                      </p>
                    </div>
                  </Link>
                </li>
              </ul>
            </CardContent>
          </Card>
        </div>

        {/* About the Author */}
        {backMatter.length > 0 && (
          <div>
            <h2 className="text-sm font-bold uppercase tracking-wider text-muted-foreground mb-3">
              Back Matter
            </h2>
            <Card className="divide-y divide-border">
              <CardContent className="p-0">
                <ul className="divide-y divide-border">
                  {backMatter.map((seg) => (
                    <li key={seg.slug}>
                      <Link
                        href={`/books/pqpa/${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>
        )}
      </main>
    </div>
  );
}