/* eslint-disable @next/next/no-img-element */
'use client';

import { useEffect, useMemo, useRef, useState } from 'react';
import { useRouter } from 'next/navigation';
import MainLogoSvg from './svgs/mainlogosvg';
import apiService from './lib/apiService';

export default function Home() {
  const router = useRouter();
  const containerRef = useRef<HTMLDivElement | null>(null);
  const [currentIndex, setCurrentIndex] = useState(0);
  const [userName, setUserName] = useState<string>('');

  // 코스, 공지사항 더미 데이터
  const courseCards = useMemo(
    () =>
      [
        {
          id: 'c1',
          title: '원자력 운영 기초',
          meta: 'VOD • 초급 • 4시간 20분',
          image: 'https://picsum.photos/seed/xrlms-c1/1200/800',
        },
        {
          id: 'c2',
          title: '반도체',
          meta: 'VOD • 중급 • 3시간 10분',
          image: 'https://picsum.photos/seed/xrlms-c2/1200/800',
        },
        {
          id: 'c3',
          title: '방사선 안전',
          meta: 'VOD • 중급 • 4시간 20분',
          image: 'https://picsum.photos/seed/xrlms-c3/1200/800',
        },
        {
          id: 'c4',
          title: '방사선 폐기물',
          meta: 'VOD • 중급 • 4시간 20분',
          image: 'https://picsum.photos/seed/xrlms-c4/1200/800',
        },
        {
          id: 'c5',
          title: '원자력 운전 개론',
          meta: 'VOD • 초급 • 3시간 00분',
          image: 'https://picsum.photos/seed/xrlms-c5/1200/800',
        },
        {
          id: 'c6',
          title: '안전 표지와 표준',
          meta: 'VOD • 초급 • 2시간 40분',
          image: 'https://picsum.photos/seed/xrlms-c6/1200/800',
        },
        {
          id: 'c7',
          title: '발전소 운영',
          meta: 'VOD • 중급 • 4시간 20분',
          image: 'https://picsum.photos/seed/xrlms-c7/1200/800',
        },
        {
          id: 'c8',
          title: '방사선 안전 실습',
          meta: 'VOD • 중급 • 3시간 30분',
          image: 'https://picsum.photos/seed/xrlms-c8/1200/800',
        },
        {
          id: 'c9',
          title: '실험실 안전',
          meta: 'VOD • 초급 • 2시간 10분',
          image: 'https://picsum.photos/seed/xrlms-c9/1200/800',
        },
        {
          id: 'c10',
          title: '기초 장비 운용',
          meta: 'VOD • 초급 • 2시간 50분',
          image: 'https://picsum.photos/seed/xrlms-c10/1200/800',
        },
      ] as Array<{ id: string; title: string; meta: string; image: string }>,
    []
  );
  const noticeRows = useMemo(
    () =>
      [
        { id: 5, title: '(공지)시스템 개선이 완료되었...', date: '2025-09-10', views: 1320, writer: '운영팀' },
        { id: 4, title: '(공지)서버 점검 안내(9/10 새벽)', date: '2025-09-10', views: 1210, writer: '운영팀' },
        { id: 3, title: '(공지)서비스 개선 안내', date: '2025-09-10', views: 1230, writer: '운영팀' },
        { id: 2, title: '(공지)시장점검 공지', date: '2025-09-10', views: 1320, writer: '관리자' },
        { id: 1, title: '뉴: 봉사시간 안내 및 한눈에 보는 현황 정리', date: '2025-08-28', views: 594, writer: '운영팀' },
      ],
    []
  );

  // NOTE: 실제 이미지 자산 연결 시 해당 src를 교체하세요.
  const slides = useMemo(
    () => [
      {
        id: 1,
        title: '시스템 점검 안내',
        description: '11월 10일 새벽 2시~4시 시스템 점검이 진행됩니다.',
        imageSrc: 'https://picsum.photos/seed/xrlms-slide1/1600/900',
      },
      {
        id: 2,
        title: '신규 과정 오픈',
        description: '최신 커리큘럼으로 업스킬링하세요.',
        imageSrc: 'https://picsum.photos/seed/xrlms-slide2/1600/900',
      },
      {
        id: 3,
        title: '수강 이벤트',
        description: '이번 달 수강 혜택을 확인해보세요.',
        imageSrc: 'https://picsum.photos/seed/xrlms-slide3/1600/900',
      },
    ],
    []
  );

  // 사용자 정보 가져오기
  useEffect(() => {
    let isMounted = true;

    async function fetchUserInfo() {
      try {
        const localStorageToken = localStorage.getItem('token');
        const cookieToken = document.cookie
          .split('; ')
          .find(row => row.startsWith('token='))
          ?.split('=')[1];
        
        const token = localStorageToken || cookieToken;
        
        if (!token) {
          return;
        }

        const response = await apiService.getCurrentUser();

        if (response.status !== 200) {
          return;
        }

        const data = response.data;
        
        if (isMounted) {
          // 사용자 권한 확인
          const userRole = data.role || data.userRole;
          if (userRole === 'ADMIN' || userRole === 'admin') {
            // admin 권한이면 /admin/id로 리다이렉트
            router.push('/admin/id');
            return;
          }
          
          if (data.name) {
            setUserName(data.name);
          }
        }
      } catch (error) {
        console.error('사용자 정보 조회 오류:', error);
      }
    }

    fetchUserInfo();

    return () => {
      isMounted = false;
    };
  }, []);

  useEffect(() => {
    const containerEl = containerRef.current;
    if (!containerEl) return;

    const handleScroll = () => {
      const width = containerEl.clientWidth;
      const index = Math.round(containerEl.scrollLeft / Math.max(width, 1));
      setCurrentIndex(index);
    };

    containerEl.addEventListener('scroll', handleScroll, { passive: true });
    return () => {
      containerEl.removeEventListener('scroll', handleScroll);
    };
  }, []);

  const scrollToIndex = (index: number) => {
    const containerEl = containerRef.current;
    if (!containerEl) return;
    const clamped = Math.max(0, Math.min(index, slides.length - 1));
    const width = containerEl.clientWidth;
    containerEl.scrollTo({ left: clamped * width, behavior: 'smooth' });
  };

  const handlePrev = () => scrollToIndex(currentIndex - 1);
  const handleNext = () => scrollToIndex(currentIndex + 1);

  return (
    <div className="w-full min-h-screen flex flex-col bg-white">
      <main className="flex-1">
        {/* 메인 컨테이너 */}
        <div className="w-full flex justify-center">
          <div className="w-full max-w-[1376px] px-3 py-6">
            {/* 배너 + 사이드 */}
            <div className="flex gap-8">
              {/* 배너 */}
              <section className="flex-none w-[944px]" aria-label="홈 상단 배너">
                <div className="relative">
                  <div
                    ref={containerRef}
                    className="flex overflow-x-hidden overscroll-none overflow-y-hidden overscroll-y-none snap-x snap-mandatory scroll-smooth rounded-[12px] bg-[#F1F3F5]"
                  >

                    {slides.map((slide) => (
                      <div key={slide.id} className="flex-none w-full h-[510px] relative snap-start overflow-hidden">
                      <img
                        alt={slide.title}
                        src={slide.imageSrc}
                        className="w-full h-full object-cover block"
                        onError={(e) => {
                          const t = e.currentTarget as HTMLImageElement;
                          if (!t.src.includes('picsum.photos')) t.src = 'https://picsum.photos/seed/xrlms-fallback-slide/1600/900';
                        }}
                      />
                        <div className="absolute left-0 right-0 bottom-0 h-[198px] bg-linear-to-b from-transparent to-black/50" />
                        <div className="absolute left-12 bottom-8 text-white">
                          <div className="font-bold text-[32px] tracking-[-0.32px] leading-normal mb-1.5">{slide.title}</div>
                          <div className="font-bold text-[24px] tracking-[-0.24px] leading-normal opacity-95">
                            {slide.description}
                          </div>
                        </div>
                      </div>
                    ))}
                  </div>

                  {/* 좌/우 내비게이션 버튼 */}
                  <button
                    type="button"
                    onClick={handlePrev}
                    aria-label="이전 배너"
                    disabled={currentIndex <= 0}
                    className="absolute left-4 top-1/2 -translate-y-1/2 size-12 rounded-full bg-white/20 text-white flex items-center justify-center cursor-pointer disabled:opacity-60"
                  >
                    <svg width="24" height="24" viewBox="0 0 24 24" aria-hidden>
                      <path d="M15 6l-6 6 6 6" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
                    </svg>
                  </button>
                  <button
                    type="button"
                    onClick={handleNext}
                    aria-label="다음 배너"
                    disabled={currentIndex >= slides.length - 1}
                    className="absolute right-4 top-1/2 -translate-y-1/2 size-12 rounded-full bg-white/20 text-white flex items-center justify-center cursor-pointer disabled:opacity-60"
                  >
                    <svg width="24" height="24" viewBox="0 0 24 24" aria-hidden>
                      <path d="M9 6l6 6-6 6" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
                    </svg>
                  </button>

                  {/* 인디케이터 */}
                  <div className="absolute left-1/2 bottom-3 -translate-x-1/2 flex items-center gap-2" aria-hidden>
                    {slides.map((_, idx) => (
                      <span key={idx} className={idx === currentIndex ? 'h-2 w-8 rounded-full bg-white' : 'size-2 rounded-full bg-white/50'} />
                    ))}
                  </div>
                </div>
              </section>

              {/* 사이드 패널 (피그마 디자인 적용) */}
              <aside className="flex-none w-[400px]">
                <div className="bg-[#F1F3F5] rounded-[12px] overflow-hidden h-[510px]">
                  {/* 상단 환영 및 통계 (피그마 사이즈/간격 적용) */}
                  <div className="px-8 py-8">
                    <div className="mb-6">
                      <div className="flex items-center gap-2">
                        <span className="text-[18px] font-bold leading-normal text-[#333C47]">
                          {userName ? `${userName}님` : '사용자님'}
                        </span>
                        <span className="text-[18px] font-bold leading-normal text-[#333C47]">환영합니다.</span>
                      </div>
                    </div>
                    <div className="flex items-center justify-center gap-6">
                      {[
                        { label: '수강중', value: 0 },
                        { label: '수강 완료', value: 0 },
                        { label: '문제 제출', value: 0 },
                        { label: '수료증', value: 0 },
                      ].map((s) => (
                        <div key={s.label} className="w-[64px] flex flex-col items-center justify-center gap-2">
                          <div className="size-16 rounded-full bg-white flex items-center justify-center">
                            <div className="text-[20px] font-bold text-[#333C47] leading-none">{s.value}</div>
                          </div>
                          <div className="text-[15px] font-semibold text-[#333C47] leading-none">{s.label}</div>
                        </div>
                      ))}
                    </div>
                  </div>
                  {/* 구분선 (좌우 32px 여백, 1px 라인) */}
                  <div className="h-px bg-[#DEE1E6] mx-8" />
                  {/* 최근 수강 내역 헤더 + 빈 상태 영역 (피그마 텍스트/간격 일치) */}
                  <div className="px-8 pt-[12px] pb-[24px]">
                    <div className="h-[60px] w-full flex items-center justify-between">
                      <div className="text-[18px] font-bold text-[#1B2027]">최근 수강 내역</div>
                      <a href="#" className="flex items-center gap-0.5 text-[14px] font-medium text-[#6C7682] no-underline">
                        전체보기
                        <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden>
                          <path d="M8 5l8 7-8 7" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
                        </svg>
                      </a>
                    </div>
                    <div className="box-border w-full flex items-center justify-center px-[45px] py-[96px]">
                      <p className="m-0 text-[16px] font-medium text-[#6C7682] text-center">최근 수강 내역이 없습니다.</p>
                    </div>
                  </div>
                </div>
              </aside>
            </div>

            {/* 교육 과정 */}
            <section className="mt-8">
              <div className="flex items-center justify-between h-[100px] px-0">
                <div className="flex items-center gap-3">
                  <h2 className="m-0 text-[24px] font-bold leading-normal text-[#1B2027]">교육 과정</h2>
                  <div className="text-[15px] font-medium leading-normal text-[#333C47]">
                    총 <span className="text-[#384FBF]">28</span>건
                  </div>
                </div>
                <a
                  href="#"
                  className="flex items-center gap-0.5 text-[14px] font-medium leading-normal text-[#6C7682] no-underline"
                >
                  전체보기
                  <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden>
                    <path
                      d="M8 5l8 7-8 7"
                      fill="none"
                      stroke="currentColor"
                      strokeWidth="2"
                      strokeLinecap="round"
                      strokeLinejoin="round"
                    />
                  </svg>
                </a>
              </div>

              <div className="grid grid-cols-5 gap-8">
                {courseCards.map((c) => (
                  <article key={c.id} className="flex flex-col gap-4 h-[260px]">
                    <div className="h-[166.4px] overflow-hidden rounded-[8px]">
                      <img
                        alt={c.title}
                        src={c.image}
                        className="w-full h-full object-cover block"
                        onError={(e) => {
                          const t = e.currentTarget as HTMLImageElement;
                          if (!t.src.includes('picsum.photos')) t.src = 'https://picsum.photos/seed/xrlms-fallback-card/1200/800';
                        }}
                      />
                    </div>
                    <div className="flex flex-col gap-1">
                      {c.id === 'c1' && (
                        <span className="inline-flex h-[20px] items-center justify-center px-1 bg-[#E5F5EC] rounded-[4px] text-[13px] font-semibold leading-[1.4] text-[#0C9D61]">
                          수강 중
                        </span>
                      )}
                      <h5 className="m-0 text-[#333C47] font-semibold text-[18px] leading-normal truncate" title={c.title}>
                        {c.title}
                      </h5>
                      <div className="flex items-center gap-1">
                        <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden className="text-[#8C95A1]">
                          <path d="M8 5v14l11-7z" fill="currentColor" />
                        </svg>
                        <p className="m-0 text-[#8C95A1] text-[13px] font-medium leading-[1.4]">{c.meta}</p>
                      </div>
                    </div>
                  </article>
                ))}
              </div>
            </section>

            {/* 공지사항 */}
            <section className="mt-9">
              <div className="flex items-center justify-between mb-4">
                <div className="flex items-center gap-3">
                  <h2 className="m-0 text-[24px] font-bold leading-normal text-[#1B2027]">공지사항</h2>
                  <div className="text-[15px] font-medium leading-normal text-[#333C47]">
                    총 <span className="text-[#384FBF]">{noticeRows.length}</span>건
                  </div>
                </div>
                <a
                  href="#"
                  className="flex items-center gap-0.5 text-[14px] font-medium leading-normal text-[#6C7682] no-underline"
                >
                  전체보기
                  <svg width="16" height="16" viewBox="0 0 24 24" aria-hidden>
                    <path
                      d="M8 5l8 7-8 7"
                      fill="none"
                      stroke="currentColor"
                      strokeWidth="2"
                      strokeLinecap="round"
                      strokeLinejoin="round"
                    />
                  </svg>
                </a>
              </div>

              <div className="rounded-[8px] border border-[#DEE1E6] overflow-hidden bg-white">
                <div className="grid grid-cols-[57px_1fr_140px_140px_140px] bg-[#F9FAFB] h-[48px] text-[14px] font-semibold text-[#4C5561] border-b border-[#DEE1E6]">
                  <div className="flex items-center justify-center px-2 whitespace-nowrap border-r border-[#DEE1E6]">번호</div>
                  <div className="flex items-center px-4 border-r border-[#DEE1E6]">제목</div>
                  <div className="flex items-center px-4 border-r border-[#DEE1E6]">게시일</div>
                  <div className="flex items-center px-4 border-r border-[#DEE1E6]">조회수</div>
                  <div className="flex items-center px-4">작성자</div>
                </div>

                <div>
                  {noticeRows.map((r) => (
                    <div
                      key={r.id}
                      className="grid grid-cols-[57px_1fr_140px_140px_140px] h-[48px] text-[15px] font-medium text-[#1B2027] border-t border-[#DEE1E6]"
                    >
                      <div className="flex items-center justify-center px-2 whitespace-nowrap border-r border-[#DEE1E6]">{r.id}</div>
                      <div
                        className="flex items-center px-4 border-r border-[#DEE1E6] whitespace-nowrap overflow-hidden text-ellipsis"
                        title={r.title}
                      >
                        {r.title}
                      </div>
                      <div className="flex items-center px-4 border-r border-[#DEE1E6]">{r.date}</div>
                      <div className="flex items-center px-4 border-r border-[#DEE1E6]">{r.views.toLocaleString()}</div>
                      <div className="flex items-center px-4">{r.writer}</div>
                    </div>
                  ))}
                </div>
              </div>
            </section>
          </div>
        </div>
      </main>

      {/* 전역 Footer는 layout.tsx에서 렌더링됩니다. */}
    </div>
  );
}