import Link from "next/link";
import type { Metadata } from "next";
import { getAllPosts } from "@/lib/devblog";
import { games as gameRegistry } from "@/lib/games";
import { Newsletter } from "../components/Newsletter";

export const metadata: Metadata = {
  title: "Devblog",
  description:
    "Behind-the-scenes updates, design decisions, and milestones from Highland Games Studio.",
};

const PAGE_SIZE = 10;

function formatDate(date: string) {
  return new Date(date).toLocaleDateString("en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
  });
}

function buildHref(params: { game?: string; page?: number }) {
  const search = new URLSearchParams();
  if (params.game) search.set("game", params.game);
  if (params.page && params.page > 1) search.set("page", String(params.page));
  const qs = search.toString();
  return qs ? `/devblog?${qs}` : "/devblog";
}

type Props = {
  searchParams: Promise<{ game?: string; page?: string }>;
};

export default async function DevblogPage({ searchParams }: Props) {
  const { game, page } = await searchParams;
  const allPosts = getAllPosts();

  const usedGameSlugs = Array.from(
    new Set(allPosts.map((p) => p.game).filter((g): g is string => Boolean(g))),
  );
  const gameOptions = usedGameSlugs
    .map((slug) => ({
      slug,
      title: gameRegistry.find((g) => g.slug === slug)?.title ?? slug,
    }))
    .sort((a, b) => a.title.localeCompare(b.title));

  const filtered = allPosts.filter((p) => {
    if (game && p.game !== game) return false;
    return true;
  });

  const currentPage = Math.max(1, parseInt(page ?? "1", 10) || 1);
  const totalPages = Math.max(1, Math.ceil(filtered.length / PAGE_SIZE));
  const safePage = Math.min(currentPage, totalPages);
  const visible = filtered.slice(
    (safePage - 1) * PAGE_SIZE,
    safePage * PAGE_SIZE,
  );

  return (
    <div className="pt-32 pb-24 px-6 lg:px-10">
      <div className="max-w-4xl mx-auto">
        <p className="font-display text-sm tracking-[0.3em] text-accent mb-4">
          — DEVBLOG
        </p>
        <h1 className="font-display text-5xl sm:text-6xl lg:text-7xl tracking-wider leading-[0.95] mb-8">
          THE JOURNEY,
          <br />
          ONE STEP AT A TIME.
        </h1>
        <p className="text-lg text-foreground-muted leading-relaxed max-w-2xl mb-12">
          Honest updates from the studio. Design decisions, prototypes, art
          milestones everything that goes into building our worlds.
        </p>

        {gameOptions.length > 0 && (
          <div className="flex flex-wrap items-center gap-2 mb-12">
            <span className="font-display text-xs tracking-[0.3em] text-foreground-muted mr-2">
              GAME
            </span>
            <Link
              href={buildHref({})}
              className={`text-xs tracking-widest uppercase border px-3 py-1.5 transition-colors ${
                !game
                  ? "border-accent text-accent"
                  : "border-border text-foreground-muted hover:border-accent hover:text-accent"
              }`}
            >
              All
            </Link>
            {gameOptions.map((g) => (
              <Link
                key={g.slug}
                href={buildHref({ game: g.slug })}
                className={`text-xs tracking-widest uppercase border px-3 py-1.5 transition-colors ${
                  game === g.slug
                    ? "border-accent text-accent"
                    : "border-border text-foreground-muted hover:border-accent hover:text-accent"
                }`}
              >
                {g.title}
              </Link>
            ))}
          </div>
        )}

        {visible.length === 0 ? (
          <p className="text-foreground-muted">
            {game
              ? "No posts match these filters yet."
              : "No posts yet. Check back soon."}
          </p>
        ) : (
          <div className="space-y-1">
            {visible.map((post) => {
              const postGame = post.game
                ? gameRegistry.find((g) => g.slug === post.game)?.title ??
                  post.game
                : null;
              return (
                <Link
                  key={post.slug}
                  href={`/devblog/${post.slug}`}
                  className="group block py-8 border-t border-border hover:border-accent transition-colors"
                >
                  <div className="flex flex-col sm:flex-row sm:items-baseline sm:justify-between gap-2 mb-3">
                    <h2 className="font-display text-2xl sm:text-3xl tracking-wider group-hover:text-accent transition-colors">
                      {post.title.toUpperCase()}
                    </h2>
                    <time
                      dateTime={post.date}
                      className="text-xs tracking-widest text-foreground-muted shrink-0"
                    >
                      {formatDate(post.date)}
                    </time>
                  </div>
                  {post.excerpt && (
                    <p className="text-foreground-muted leading-relaxed max-w-2xl">
                      {post.excerpt}
                    </p>
                  )}
                  {postGame && (
                    <div className="flex flex-wrap items-center gap-2 mt-4">
                      <span className="text-[0.65rem] tracking-widest uppercase border border-accent/40 text-accent px-2 py-1">
                        {postGame}
                      </span>
                    </div>
                  )}
                  <span className="inline-block mt-4 font-display text-xs tracking-widest text-foreground-muted group-hover:text-accent transition-colors">
                    READ →
                  </span>
                </Link>
              );
            })}
          </div>
        )}

        {totalPages > 1 && (
          <nav
            aria-label="Pagination"
            className="flex items-center justify-between mt-12 pt-8 border-t border-border"
          >
            {safePage > 1 ? (
              <Link
                href={buildHref({ game, page: safePage - 1 })}
                className="font-display text-xs tracking-widest text-foreground-muted hover:text-accent transition-colors"
              >
                ← NEWER
              </Link>
            ) : (
              <span aria-hidden />
            )}
            <span className="font-display text-xs tracking-widest text-foreground-muted">
              PAGE {safePage} / {totalPages}
            </span>
            {safePage < totalPages ? (
              <Link
                href={buildHref({ game, page: safePage + 1 })}
                className="font-display text-xs tracking-widest text-foreground-muted hover:text-accent transition-colors"
              >
                OLDER →
              </Link>
            ) : (
              <span aria-hidden />
            )}
          </nav>
        )}

        <section className="mt-24 border-t border-border pt-16">
          <p className="font-display text-xs tracking-[0.3em] text-accent mb-3">
            — NEWSLETTER
          </p>
          <h2 className="font-display text-3xl sm:text-4xl tracking-wider mb-4">
            DON&apos;T MISS A SUMMIT
          </h2>
          <p className="text-foreground-muted leading-relaxed max-w-2xl mb-6">
            Subscribe to get devblog highlights and release news in your inbox.
          </p>
          <Newsletter variant="compact" />
        </section>
      </div>
    </div>
  );
}