"use client";
import { useEffect, useState } from "react";
import { Swiper, SwiperSlide } from "swiper/react";
import { Navigation, Pagination } from "swiper/modules";
import Link from "next/link";
import Image from "next/image";

const PAGE_SIZE = 8; // 每页8条，4列2行
const PAGE_SLUG = "case"; // 博客slug常量

export default function Blogs({
  parentClass = "xl:w-10/12 lg:w-10/12 w-full flex-[0_0_auto] !px-[15px] max-w-full !mx-auto",
  marginTop = true,
}) {
  const [posts, setPosts] = useState([]);
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    async function fetchData() {
      setLoading(true);
      try {
        const res = await fetch("/api/get-page-data", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ slug_list: [PAGE_SLUG], page: currentPage, page_size: PAGE_SIZE }),
        });
        const json = await res.json();
        if (Array.isArray(json.data)) {
          setPosts(json.data);
          setTotalPages(Math.ceil((json.total || 0) / PAGE_SIZE));
        } else {
          setPosts([]);
          setTotalPages(1);
        }
      } catch (e) {
        setPosts([]);
        setTotalPages(1);
      }
      setLoading(false);
    }
    fetchData();
  }, [currentPage]);

  // 分页控件
  function PaginationComp() {
    if (totalPages <= 1) return null;
    return (
      <nav className="flex justify-center mt-8" aria-label="pagination">
        <ul className="pagination flex gap-2">
          {Array.from({ length: totalPages }).map((_, idx) => (
            <li key={idx}>
              <button
                className={`px-3 py-1 rounded ${currentPage === idx + 1 ? "bg-blue-600 text-white" : "bg-gray-100 text-gray-700"}`}
                onClick={() => setCurrentPage(idx + 1)}
                disabled={currentPage === idx + 1}
              >
                {idx + 1}
              </button>
            </li>
          ))}
        </ul>
      </nav>
    );
  }

  // 渲染卡片内容
  function renderCard(post, idx) {
    // 多图轮播
    if (Array.isArray(post.images) && post.images.length > 1) {
      return (
        <Swiper
          className="w-full h-56 rounded-xl overflow-hidden"
          modules={[Navigation, Pagination]}
          pagination={{ clickable: true }}
          navigation
        >
          {post.images.map((img, i) => (
            <SwiperSlide key={i}>
              <Image src={img} alt={post.title || "image"} width={400} height={225} className="w-full h-56 object-cover" />
            </SwiperSlide>
          ))}
        </Swiper>
      );
    }
    // 视频
    if (post.video_src || post.videoId) {
      // 支持YouTube或本地视频
      if (post.video_src && (post.video_src.endsWith('.mp4') || post.video_src.startsWith('/files/'))) {
        return (
          <video controls className="w-full h-56 rounded-xl object-cover">
            <source src={post.video_src} type="video/mp4" />
            您的浏览器不支持视频播放。
          </video>
        );
      }
      // YouTube
      const vid = post.videoId || (post.video_src && post.video_src.includes('youtube') ? post.video_src.split('embed/')[1] : null);
      if (vid) {
        return (
          <iframe
            className="w-full h-56 rounded-xl"
            src={`https://www.youtube.com/embed/${vid}`}
            title="YouTube video"
            allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
            allowFullScreen
          />
        );
      }
    }
    // 单图
    const img = post.image || (Array.isArray(post.images) && post.images[0]);
    if (img) {
      return (
        <Image src={img} alt={post.title || "image"} width={400} height={225} className="w-full h-56 object-cover rounded-xl" />
      );
    }
    return null;
  }

  return (
    <div className={parentClass}>
      <div className={`blog grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-6 ${marginTop ? "!mt-[-7rem]" : ""}`}>
        {loading ? (
          <div className="col-span-4 text-center py-12 text-gray-400">加载中...</div>
        ) : posts.length === 0 ? (
          <div className="col-span-4 text-center py-12 text-gray-400">暂无数据</div>
        ) : (
          posts.map((post, idx) => (
            <article key={post.slug || post.id || idx} className="post card bg-white rounded-xl shadow hover:shadow-lg transition overflow-hidden flex flex-col">
              <div className="card-img-top relative">
                {renderCard(post, idx)}
              </div>
              <div className="card-body flex-1 p-4 flex flex-col">
                <div className="post-header mb-2">
                  <div className="text-xs text-blue-500 font-bold uppercase mb-1">{post.category || post.categories || ""}</div>
                  <h2 className="post-title text-lg font-semibold mb-1 line-clamp-2">
                    <Link href={post.slug ? `/${PAGE_SLUG}/${post.slug}` : "#"} className="hover:text-blue-600">{post.title}</Link>
                  </h2>
                </div>
                <div className="text-gray-500 text-sm flex-1 line-clamp-3 mb-2">{post.subtitle}</div>
                <div className="flex items-center text-xs text-gray-400 mt-auto">
                  <span>{post.date || post.published_at || ""}</span>
                  {post.author && <span className="ml-2">{post.author}</span>}
                  {typeof post.comments === 'number' && <span className="ml-auto">💬 {post.comments}</span>}
                  {typeof post.likes === 'number' && <span className="ml-2">❤️ {post.likes}</span>}
                </div>
              </div>
            </article>
          ))
        )}
      </div>
      <PaginationComp />
    </div>
  );
}