"use client";

import Link from "next/link";
import gsap from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";
import type { PublicPost } from "@/lib/store";
import { formatDate, readingTimeLabel } from "@/lib/utils";
import { useGsapAnimation } from "./useGsapAnimation";

gsap.registerPlugin(ScrollTrigger);

function FeaturedCard({ post }: { post: PublicPost }) {
  return (
    <Link href={`/posts/${post.slug}`} className="group block featured-card">
      <article className="relative p-7 md:p-10 rounded-2xl bg-cream border border-warm-gray/10 hover:border-terracotta/20 hover:shadow-lg hover:shadow-terracotta/5 transition-all duration-500">
        <span className="inline-block font-sans text-sm tracking-widest text-terracotta uppercase mb-4">
          {post.category}
        </span>
        <h3 className="font-display text-2xl md:text-3xl font-medium text-ink leading-snug group-hover:text-terracotta transition-colors duration-300 mb-4">
          {post.title}
        </h3>
        <p className="font-body text-base text-ink-muted leading-relaxed line-clamp-2 mb-5">
          {post.excerpt}
        </p>
        <div className="flex items-center gap-3 font-sans text-sm text-ink-muted">
          <time>{formatDate(post.date)}</time>
          <span className="w-1 h-1 rounded-full bg-warm-gray" />
          <span>{readingTimeLabel(post.readingTime)}</span>
        </div>
        <div className="absolute top-7 right-7 md:top-10 md:right-10 opacity-0 -translate-x-2 group-hover:opacity-100 group-hover:translate-x-0 transition-all duration-300">
          <svg width="20" height="20" viewBox="0 0 20 20" fill="none" stroke="currentColor" strokeWidth="1.5" className="text-terracotta">
            <path d="M5 10h10M11 6l4 4-4 4" />
          </svg>
        </div>
      </article>
    </Link>
  );
}

export function FeaturedGrid({ posts }: { posts: PublicPost[] }) {
  const ref = useGsapAnimation<HTMLDivElement>((_, isReduced) => {
    if (isReduced || posts.length === 0) return;
    gsap.from(".featured-card", {
      y: 50,
      opacity: 0,
      duration: 0.8,
      stagger: 0.15,
      ease: "power3.out",
      scrollTrigger: { trigger: ref.current, start: "top 85%" },
    });
  }, [posts.length]);

  if (posts.length === 0) return null;

  return (
    <section ref={ref as React.RefObject<HTMLDivElement>} className="px-page max-w-5xl mx-auto pb-16">
      <div className="grid md:grid-cols-2 gap-5">
        {posts.map((post) => (
          <FeaturedCard key={post.slug} post={post} />
        ))}
      </div>
    </section>
  );
}

export function RecentList({ posts }: { posts: PublicPost[] }) {
  const ref = useGsapAnimation<HTMLDivElement>((_, isReduced) => {
    if (isReduced || posts.length === 0) return;
    gsap.from(".recent-item", {
      y: 30,
      opacity: 0,
      duration: 0.6,
      stagger: 0.08,
      ease: "power3.out",
      scrollTrigger: { trigger: ref.current, start: "top 85%" },
    });
  }, [posts.length]);

  if (posts.length === 0) return null;

  return (
    <section ref={ref as React.RefObject<HTMLDivElement>} className="px-page max-w-5xl mx-auto pb-24">
      <div className="divider-ornament mb-10">
        <span className="font-display text-sm italic whitespace-nowrap">最新文章</span>
      </div>
      <div className="space-y-0">
        {posts.map((post) => (
          <Link key={post.slug} href={`/posts/${post.slug}`} className="recent-item group block">
            <article className="flex items-baseline gap-6 py-7 border-b border-warm-gray/10 hover:bg-cream -mx-4 px-4 rounded-lg transition-all duration-300">
              <time className="shrink-0 font-sans text-sm text-ink-muted tabular-nums w-28 pt-0.5">
                {formatDate(post.date)}
              </time>
              <div className="flex-1 min-w-0">
                <h3 className="font-display text-xl font-medium text-ink group-hover:text-terracotta transition-colors duration-300 truncate">
                  {post.title}
                </h3>
                <p className="mt-1.5 font-body text-base text-ink-muted line-clamp-1">
                  {post.excerpt}
                </p>
              </div>
              <span className="hidden sm:inline-block shrink-0 font-sans text-sm text-ink-muted tracking-wide">
                {post.category}
              </span>
            </article>
          </Link>
        ))}
      </div>
      <div className="mt-10 text-center">
        <Link
          href="/blog"
          className="inline-flex items-center gap-2 font-sans text-sm text-ink-muted hover:text-terracotta transition-colors duration-300"
        >
          查看全部文章
          <svg width="14" height="14" viewBox="0 0 14 14" fill="none" stroke="currentColor" strokeWidth="1.5">
            <path d="M3 7h8M8 4l3 3-3 3" />
          </svg>
        </Link>
      </div>
    </section>
  );
}