'use client';

import React, { useRef, useState } from 'react';
import Link from 'next/link';
import { ArrowRight, ChevronLeft, ChevronRight } from 'lucide-react';
import { Swiper, SwiperSlide } from 'swiper/react';
import { Navigation, A11y } from 'swiper/modules';
import type { Swiper as SwiperType } from 'swiper';
import { getImageUrl } from '@/lib/utils';
import {
  DEFAULT_BLOG_ARTICLES,
  getSectionTitle,
} from '@/lib/homepageDefaults';

import 'swiper/css';
import 'swiper/css/navigation';

interface ArticleItem {
  id: string;
  title: string;
  excerpt: string;
  image: string;
  link: string;
}

interface ArticlesSectionProps {
  config?: any;
}

function mapArticles(raw: any[]): ArticleItem[] {
  return raw
    .filter((a) => a && (a.title || a.image))
    .map((a: any, idx: number) => {
      const fallback = DEFAULT_BLOG_ARTICLES[idx % DEFAULT_BLOG_ARTICLES.length];
      const img = a.image || a.image_url || '';
      return {
        id: String(a.id || `article-${idx + 1}`),
        title: String(a.title || fallback.title),
        excerpt: String(a.excerpt || a.subtitle || a.description || fallback.excerpt),
        image: img ? getImageUrl(img) : fallback.image,
        link: String(a.link || a.url || a.href || `/blog`),
      };
    });
}

export const ArticlesSection: React.FC<ArticlesSectionProps> = ({ config }) => {
  const raw =
    config?.metadata_json?.articles || config?.metadata?.articles || [];
  const articles =
    Array.isArray(raw) && raw.length > 0 ? mapArticles(raw) : DEFAULT_BLOG_ARTICLES;

  const title = getSectionTitle(config, 'tech_blog');
  const viewAllHref =
    config?.metadata_json?.view_all_url ||
    config?.metadata?.view_all_url ||
    '/blog';

  const swiperRef = useRef<SwiperType | null>(null);
  const [canPrev, setCanPrev] = useState(false);
  const [canNext, setCanNext] = useState(false);
  const [showNav, setShowNav] = useState(false);

  const syncNav = (swiper: SwiperType) => {
    const overflow = !swiper.isLocked && swiper.slides.length > 0;
    setShowNav(overflow);
    setCanPrev(overflow && !swiper.isBeginning);
    setCanNext(overflow && !swiper.isEnd);
  };

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

  return (
    <section className="py-10 bg-white font-sans">
      <div className="container mx-auto px-4 sm:px-6 lg:px-8 max-w-[1400px]">
        {/* Header + full-width rule — TechShop reference */}
        <div className="flex items-center justify-between gap-4 pb-3.5 border-b border-[#e5e5e5] mb-7">
          <h2 className="text-[20px] md:text-[22px] font-bold text-[#222] tracking-tight text-left">
            {title}
          </h2>
          <Link
            href={viewAllHref}
            className="shrink-0 text-[13px] font-semibold text-[#333] hover:text-primary transition-colors inline-flex items-center gap-1.5"
          >
            View All
            <ArrowRight size={14} strokeWidth={2.5} />
          </Link>
        </div>

        <div className={`relative ${showNav ? 'md:px-10' : ''}`}>
          {showNav ? (
            <>
              <button
                type="button"
                aria-label="Previous articles"
                disabled={!canPrev}
                onClick={() => swiperRef.current?.slidePrev()}
                className={`hidden md:flex absolute left-0 top-[28%] -translate-y-1/2 z-20 w-10 h-10 rounded-full items-center justify-center shadow-md transition-colors ${
                  canPrev
                    ? 'bg-primary text-white hover:bg-primary-hover cursor-pointer'
                    : 'bg-primary/40 text-white cursor-default'
                }`}
              >
                <ChevronLeft size={20} strokeWidth={2.5} />
              </button>
              <button
                type="button"
                aria-label="Next articles"
                disabled={!canNext}
                onClick={() => swiperRef.current?.slideNext()}
                className={`hidden md:flex absolute right-0 top-[28%] -translate-y-1/2 z-20 w-10 h-10 rounded-full items-center justify-center shadow-md transition-colors ${
                  canNext
                    ? 'bg-primary text-white hover:bg-primary-hover cursor-pointer'
                    : 'bg-primary/40 text-white cursor-default'
                }`}
              >
                <ChevronRight size={20} strokeWidth={2.5} />
              </button>
            </>
          ) : null}

          <Swiper
            modules={[Navigation, A11y]}
            onSwiper={(swiper) => {
              swiperRef.current = swiper;
              requestAnimationFrame(() => syncNav(swiper));
            }}
            onSlideChange={syncNav}
            onResize={syncNav}
            onBreakpoint={syncNav}
            onLock={() => {
              setShowNav(false);
              setCanPrev(false);
              setCanNext(false);
            }}
            onUnlock={(swiper) => syncNav(swiper)}
            watchOverflow
            spaceBetween={22}
            slidesPerView={1.15}
            breakpoints={{
              640: { slidesPerView: 2, spaceBetween: 20 },
              1024: { slidesPerView: 3, spaceBetween: 22 },
              1280: { slidesPerView: 4, spaceBetween: 24 },
            }}
            className="!overflow-visible"
          >
            {articles.map((article) => (
              <SwiperSlide key={article.id} className="h-auto">
                <article className="text-left group">
                  <Link href={article.link} className="block">
                    <div className="relative w-full aspect-[16/10] rounded-xl overflow-hidden bg-[#f0f0f0] mb-3.5">
                      {/* eslint-disable-next-line @next/next/no-img-element */}
                      <img
                        src={article.image}
                        alt={article.title}
                        className="absolute inset-0 w-full h-full object-cover transition-transform duration-500 group-hover:scale-[1.03]"
                        loading="lazy"
                      />
                    </div>
                    <h3 className="text-[15px] md:text-[16px] font-bold text-[#222] leading-snug mb-2 line-clamp-2 group-hover:text-primary transition-colors">
                      {article.title}
                    </h3>
                  </Link>
                  {article.excerpt ? (
                    <p className="text-[13px] text-[#777] leading-relaxed line-clamp-2">
                      {article.excerpt}
                    </p>
                  ) : null}
                </article>
              </SwiperSlide>
            ))}
          </Swiper>
        </div>
      </div>
    </section>
  );
};