"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";

export default function PageItems({ page_slug = "", page_size = 8, columns = 4 }) {
  const [posts, setPosts] = useState([]);
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [loading, setLoading] = useState(false);

  // 静态映射，避免 Tailwind JIT 无法识别动态类名
  const colClass = {
    1: "lg:grid-cols-1",
    2: "lg:grid-cols-2",
    3: "lg:grid-cols-3",
    4: "lg:grid-cols-4",
    5: "lg:grid-cols-5",
    6: "lg:grid-cols-6",
  }[columns] || "lg:grid-cols-4";

  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 }),
        });
        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, page_slug, page_size]);

  // 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（只返回图片部分，结构在下方article里）
  function renderCardImage(post, idx) {
    // 多图轮播
    if (Array.isArray(post.images) && post.images.length > 1) {
      return (
        <Swiper
          className="swiper"
          modules={[Navigation, Pagination]}
          pagination={{ clickable: true, el: `.spdb${idx}` }}
          navigation={{ prevEl: `.snbpb${idx}`, nextEl: `.snbnb${idx}` }}
        >
          {post.images.map((img, i) => (
            <SwiperSlide key={i} className="swiper-slide">
              <Image
                className="!transition-all !duration-[0.35s] !ease-in-out group-hover:scale-105 w-full h-auto"
                alt={post.title || "image"}
                src={img}
                width={960}
                height={600}
              />
            </SwiperSlide>
          ))}
        </Swiper>
      );
    }
    // 视频
    if (post.video_src || post.videoId) {
      if (post.video_src && (post.video_src.endsWith('.mp4') || post.video_src.startsWith('/files/'))) {
        return (
          <video controls className="w-full h-56 rounded-xl object-cover">
            <source src={post.video_src} type="video/mp4" />
            您的浏览器不支持视频播放。
          </video>
        );
      }
      const vid = post.videoId || (post.video_src && post.video_src.includes('youtube') ? post.video_src.split('embed/')[1] : null);
      if (vid) {
        return (
          <iframe
            className="w-full h-56 rounded-xl"
            src={`https://www.youtube.com/embed/${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
          className="!transition-all !duration-[0.35s] !ease-in-out group-hover:scale-105 w-full h-auto"
          alt={post.title || "image"}
          src={img}
          width={960}
          height={600}
        />
      );
    }
    return null;
  }

  function getSummary(text, maxLen = 100) {
    if (!text) return "";
    // 中文：直接按字符截断
    if (/[\u4e00-\u9fa5]/.test(text)) {
      return text.length > maxLen ? text.slice(0, maxLen) + "..." : text;
    }
    // 英文：按字符截断，但不截断单词
    if (text.length <= maxLen) return text;
    let cut = text.slice(0, maxLen);
    // 如果最后一个字符不是空格，向前找到最近的空格
    if (!/\s/.test(text[maxLen])) {
      const lastSpace = cut.lastIndexOf(" ");
      if (lastSpace > 0) cut = cut.slice(0, lastSpace);
    }
    return cut + "...";
  }

  return (
    <div className="xl:w-10/12 lg:w-10/12 w-full flex-[0_0_auto] !px-[15px] max-w-full !mx-auto my-[150px]">
      <div
        className={`blog classic-view grid grid-cols-1 sm:grid-cols-2 ${colClass} gap-6`}
      >
        {loading ? (
          <div className="col-span-4 text-center py-12 text-gray-400">加载中...</div>
        ) : posts.length === 0 ? (
          <div className="col-span-4 text-center py-12 text-gray-400">暂无数据</div>
        ) : (
          posts.map((post, idx) => (
            <article key={post.slug || post.id || idx} className="post !mb-8">
              <div className="card">
                {/* 图片/轮播/视频部分 */}
                <figure className="card-img-top overlay overlay-1 hover-scale group">
                  <Link href={post.slug ? `/${page_slug}/${post.slug}` : "#"} className="block relative">
                    {renderCardImage(post, idx)}
                    <span className="bg"></span>
                    <figcaption className="group-hover:opacity-100 absolute w-full h-full opacity-0 text-center px-4 py-3 inset-0 z-[5] pointer-events-none p-2">
                      <h5 className="from-top !mb-0 absolute w-full translate-y-[-80%] p-[.75rem_1rem] left-0 top-2/4">
                        Read More
                      </h5>
                    </figcaption>
                  </Link>
                </figure>
                {/* 文字内容 */}
                <div className="card-body flex-[1_1_auto] p-[40px] xl:!p-[2rem_2.5rem_1.25rem] lg:!p-[2rem_2.5rem_1.25rem] md:!p-[2rem_2.5rem_1.25rem] max-md:pb-4">
                  <div className="post-header !mb-[.9rem]">
                    <div className="inline-flex !mb-[.4rem] uppercase !tracking-[0.02rem] text-[0.7rem] font-bold !text-[#aab0bc] relative align-top !pl-[1.4rem] before:content-[''] before:absolute before:inline-block before:translate-y-[-60%] before:w-3 before:h-[0.05rem] before:left-0 before:top-2/4 before:bg-[#3f78e0]">
                      <a href={`/${page_slug}`} className="hover" rel="category">
                        {post.category || ""}
                      </a>
                    </div>
                    <h2 className="post-title !mt-1 !leading-[1.35] !mb-0">
                      <Link
                        className="!text-[#343f52] hover:!text-[#3f78e0]"
                        href={post.slug ? `/${page_slug}/${post.slug}` : "#"}
                      >
                        {post.title}
                      </Link>
                    </h2>
                  </div>
                  <div className="!relative">
                    <p>{getSummary(post.subtitle)}</p>
                  </div>
                </div>
                {/* 底部信息 */}
                <div className="card-footer xl:!p-[1.25rem_2.5rem_1.25rem] lg:!p-[1.25rem_2.5rem_1.25rem] md:!p-[1.25rem_2.5rem_1.25rem] p-[18px_40px]">
                  <ul className="!text-[0.7rem] !text-[#aab0bc] m-0 p-0 list-none flex !mb-0">
                    <li className="post-date inline-block">
                      <i className="uil uil-calendar-alt pr-[0.2rem] align-[-.05rem] before:content-['\\e9ba']" />
                      <span>{post.date || post.published_at || ""}</span>
                    </li>
                    {post.author && (
                      <li className="post-author inline-block before:content-[''] before:inline-block before:w-[0.2rem] before:h-[0.2rem] before:opacity-50 before:m-[0_.6rem_0] before:rounded-[100%] before:align-[.15rem] before:bg-[#aab0bc]">
                        <a className="!text-[#aab0bc] hover:!text-[#3f78e0] hover:!border-[#3f78e0]" href="#">
                          <i className="uil uil-user pr-[0.2rem] align-[-.05rem] before:content-['\\ed6f']" />
                          <span>{post.author}</span>
                        </a>
                      </li>
                    )}
                    {typeof post.comments === 'number' && (
                      <li className="post-comments inline-block before:content-[''] before:inline-block before:w-[0.2rem] before:h-[0.2rem] before:opacity-50 before:m-[0_.6rem_0] before:rounded-[100%] before:align-[.15rem] before:bg-[#aab0bc]">
                        <a className="!text-[#aab0bc] hover:!text-[#3f78e0] hover:!border-[#3f78e0]" href="#">
                          <i className="uil uil-comment pr-[0.2rem] align-[-.05rem] before:content-['\\ea54']" />
                          {post.comments}
                        </a>
                      </li>
                    )}
                    {typeof post.likes === 'number' && (
                      <li className="post-likes !ml-auto inline-block">
                        <a className="!text-[#aab0bc] hover:!text-[#3f78e0] hover:!border-[#3f78e0]" href="#">
                          <i className="uil uil-heart-alt pr-[0.2rem] align-[-.05rem] before:content-['\\eb60']" />
                          {post.likes}
                        </a>
                      </li>
                    )}
                  </ul>
                </div>
              </div>
            </article>
          ))
        )}
      </div>
      <PaginationComp />
    </div>
  );
}