import { useBlogPost, useBlogPosts } from "@/hooks/use-blog";
import { usePageMeta } from "@/hooks/use-page-meta";
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@sase/ui";
import { Link } from "@tanstack/react-router";
import { ChevronRight } from "lucide-react";
import ReactMarkdown from "react-markdown";
import remarkGfm from "remark-gfm";

// Blog content is rendered in two shells: the public marketing pages (/blog)
// and the dashboard-wrapped pages (/dashboard/blog) so logged-in users keep
// the sidebar. Only the internal link targets differ; the canonical URL always
// points at the public page.

type BlogListPath = "/blog" | "/dashboard/blog";
type BlogPostPath = "/blog/$slug" | "/dashboard/blog/$slug";

// ─── LIST ─────────────────────────────────────────────────────────────────────

export function BlogListContent({ postLinkTo }: { postLinkTo: BlogPostPath }) {
  usePageMeta({
    title: "Blog — Sase.tr | Şase & Yedek Parça Rehberi",
    description: "Şase numarası okuma, OEM vs muadil parça, dijital dönüşüm ve daha fazlası.",
    canonical: "https://sase.tr/blog",
  });

  // All posts come from the central Directus CMS through the API.
  const { data: apiPosts, isLoading } = useBlogPosts();

  const posts = (apiPosts ?? [])
    .map((p) => ({
      slug: p.slug,
      title: p.title,
      description: p.metaDescription ?? "",
      date: p.publishedAt.slice(0, 10),
    }))
    .sort((a, b) => b.date.localeCompare(a.date));

  return (
    <>
      <h1 className="text-4xl font-bold">Blog</h1>
      <p className="mt-4 text-lg text-muted-foreground">
        Yedek parça sektörü, araç bakımı ve Sase.tr hakkında güncel yazılar.
      </p>

      {isLoading && posts.length === 0 && (
        <p className="mt-12 text-muted-foreground">Yükleniyor…</p>
      )}

      <div className="mt-12 grid gap-6 sm:grid-cols-2">
        {posts.map((post) => (
          <Link key={post.slug} to={postLinkTo} params={{ slug: post.slug }}>
            <Card className="h-full transition hover:border-foreground/20">
              <CardHeader>
                <CardDescription>{post.date}</CardDescription>
                <CardTitle className="text-lg">{post.title}</CardTitle>
              </CardHeader>
              <CardContent>
                <p className="text-sm text-muted-foreground">{post.description}</p>
              </CardContent>
            </Card>
          </Link>
        ))}
      </div>
    </>
  );
}

// ─── POST ─────────────────────────────────────────────────────────────────────
// Posts live in the central Directus CMS and arrive as markdown via the API.

const mdComponents = {
  h2: (props: React.ComponentProps<"h2">) => (
    <h2 className="text-xl font-semibold text-foreground" {...props} />
  ),
  h3: (props: React.ComponentProps<"h3">) => (
    <h3 className="text-lg font-semibold text-foreground" {...props} />
  ),
  ul: (props: React.ComponentProps<"ul">) => <ul className="list-disc space-y-2 pl-6" {...props} />,
  ol: (props: React.ComponentProps<"ol">) => (
    <ol className="list-decimal space-y-2 pl-6" {...props} />
  ),
  strong: (props: React.ComponentProps<"strong">) => (
    <strong className="text-foreground" {...props} />
  ),
  a: (props: React.ComponentProps<"a">) => <a className="text-foreground underline" {...props} />,
};

function MarkdownBody({ markdown }: { markdown: string }) {
  return (
    <div className="space-y-6 leading-relaxed text-muted-foreground">
      <ReactMarkdown remarkPlugins={[remarkGfm]} components={mdComponents}>
        {markdown}
      </ReactMarkdown>
    </div>
  );
}

export function BlogPostContent({ slug, listLinkTo }: { slug: string; listLinkTo: BlogListPath }) {
  const { data: post, isLoading, isError } = useBlogPost(slug);

  const title = post?.title ?? "Blog";
  const description = post?.metaDescription ?? "";
  const date = post?.publishedAt?.slice(0, 10) ?? "";

  usePageMeta({
    title: `${title} | Sase.tr Blog`,
    description,
    canonical: `https://sase.tr/blog/${slug}`,
  });

  let body: React.ReactNode;
  if (post) body = <MarkdownBody markdown={post.bodyMarkdown} />;
  else if (isLoading) body = <p className="text-muted-foreground">Yükleniyor…</p>;
  else
    body = (
      <p className="text-muted-foreground">{isError ? "Yazı bulunamadı." : "Yazı yüklenemedi."}</p>
    );

  return (
    <>
      {/* Breadcrumb */}
      <nav className="mb-8 flex items-center gap-1.5 text-sm text-muted-foreground">
        <Link to={listLinkTo} className="transition hover:text-foreground">
          Blog
        </Link>
        <ChevronRight className="size-3.5" />
        <span className="text-foreground">{title}</span>
      </nav>

      <article>
        {date && <time className="text-sm text-muted-foreground">{date}</time>}
        <h1 className="mt-3 text-3xl font-bold leading-tight sm:text-4xl">{title}</h1>
        {description && <p className="mt-4 text-lg text-muted-foreground">{description}</p>}

        {post?.coverImage && (
          <img
            src={post.coverImage}
            alt={title}
            className="mt-8 w-full rounded-lg border object-cover"
          />
        )}

        <div className="mt-10">{body}</div>
      </article>

      {/* Back link */}
      <div className="mt-16 border-t pt-8">
        <Link
          to={listLinkTo}
          className="inline-flex items-center gap-1.5 text-sm text-muted-foreground transition hover:text-foreground"
        >
          ← Tüm yazılar
        </Link>
      </div>
    </>
  );
}