/**
 * 프로필 페이지
 * 프로필 정보 및 마인크래프트 계정 연동
 */

import React, { useState, useEffect } from 'react';
import { Link, useNavigate, useLocation } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';
import { ArrowLeft, Copy, Check, Gamepad2, Link as LinkIcon, Unlink, RefreshCw, User, Mail } from 'lucide-react';
import { motion, AnimatePresence } from 'framer-motion';
import { io } from 'socket.io-client';

export default function ProfilePage() {
  const navigate = useNavigate();
  const location = useLocation();
  const { user, isLoggedIn, loading, checkAuth, logout } = useAuth();
  
  const [linkStatus, setLinkStatus] = useState(null);
  const [linkToken, setLinkToken] = useState(null);
  const [command, setCommand] = useState('');
  const [copied, setCopied] = useState(false);
  const [isLoading, setIsLoading] = useState(false);
  const [polling, setPolling] = useState(false);
  const [showUnlinkDialog, setShowUnlinkDialog] = useState(false);
  const [showDeleteDialog, setShowDeleteDialog] = useState(false);

  // 로그인 체크 (loading 완료 후에만)
  useEffect(() => {
    if (!loading && !isLoggedIn) {
      navigate('/login', { state: { from: location.pathname } });
    }
  }, [loading, isLoggedIn, navigate, location.pathname]);

  // 연동 상태 확인
  useEffect(() => {
    fetchLinkStatus();
  }, []);

  // 폴링 (연동 대기 중일 때)
  useEffect(() => {
    if (!polling) return;
    
    const interval = setInterval(async () => {
      const status = await fetchLinkStatus();
      if (status?.linked) {
        setPolling(false);
        setLinkToken(null);
        setCommand('');
        // 유저 정보 새로고침
        await checkAuth();
      }
    }, 3000);
    
    return () => clearInterval(interval);
  }, [polling]);

  // 연동 대기 중 새로고침 방지 + 토큰 무효화
  useEffect(() => {
    if (!linkToken) return;
    
    const handleBeforeUnload = (e) => {
      // 토큰 무효화 API 호출 (sendBeacon으로 페이지 이탈 전 전송)
      const token = localStorage.getItem('token');
      navigator.sendBeacon('/link/cancel', JSON.stringify({ authToken: token }));
      
      e.preventDefault();
      e.returnValue = '연동이 진행 중입니다. 페이지를 떠나시겠습니까?';
      return e.returnValue;
    };
    
    window.addEventListener('beforeunload', handleBeforeUnload);
    return () => window.removeEventListener('beforeunload', handleBeforeUnload);
  }, [linkToken]);

  // 소켓으로 닉네임 변경 감지 시 동기화
  useEffect(() => {
    if (!linkStatus?.minecraftUuid) return;
    
    const socket = io(window.location.origin, { path: '/socket.io' });
    
    socket.on('status', async (status) => {
      if (status?.online && status?.players?.list) {
        const playerInGame = status.players.list.find(p => p.uuid === linkStatus.minecraftUuid);
        // 게임 내 닉네임과 현재 저장된 닉네임이 다르면 동기화
        if (playerInGame && playerInGame.name !== user?.name) {
          // fetchLinkStatus가 DB 업데이트 → 완료 후 checkAuth로 user.name 갱신
          await fetchLinkStatus();
          await checkAuth();
        }
      }
    });
    
    return () => socket.disconnect();
  }, [linkStatus?.minecraftUuid, user?.name]);

  const fetchLinkStatus = async () => {
    try {
      const token = localStorage.getItem('token');
      const res = await fetch('/link/status', {
        headers: { 'Authorization': `Bearer ${token}` }
      });
      const data = await res.json();
      setLinkStatus(data);
      return data;
    } catch (error) {
      console.error('연동 상태 확인 실패:', error);
      return null;
    }
  };

  const handleRequestLink = async () => {
    setIsLoading(true);
    try {
      const token = localStorage.getItem('token');
      const res = await fetch('/link/request', {
        method: 'POST',
        headers: { 'Authorization': `Bearer ${token}` }
      });
      const data = await res.json();
      
      if (data.linked) {
        setLinkStatus({ linked: true, minecraftName: data.minecraftName });
      } else {
        setLinkToken(data.token);
        setCommand(data.command);
        setPolling(true);
      }
    } catch (error) {
      console.error('연동 요청 실패:', error);
    } finally {
      setIsLoading(false);
    }
  };

  const handleCopyCommand = () => {
    navigator.clipboard.writeText(command);
    setCopied(true);
    setTimeout(() => setCopied(false), 2000);
  };

  const handleUnlink = async () => {
    try {
      const token = localStorage.getItem('token');
      await fetch('/link/unlink', {
        method: 'POST',
        headers: { 'Authorization': `Bearer ${token}` }
      });
      setLinkStatus({ linked: false });
      setShowUnlinkDialog(false);
      await checkAuth();
    } catch (error) {
      console.error('연동 해제 실패:', error);
    }
  };

  const handleDelete = async () => {
    try {
      const token = localStorage.getItem('token');
      const res = await fetch('/auth/delete', {
        method: 'DELETE',
        headers: { 'Authorization': `Bearer ${token}` }
      });
      
      if (res.ok) {
        logout();
        navigate('/');
      } else {
        console.error('탈퇴 실패');
      }
    } catch (error) {
      console.error('탈퇴 실패:', error);
    }
  };

  if (!user) return null;

  return (
    <div className="bg-mc-bg pb-8">
      {/* 헤더 */}
      <header className="bg-mc-dark border-b border-white/10 sticky top-0 z-50 backdrop-blur-xl">
        <div className="max-w-4xl mx-auto px-4 sm:px-6 py-4 flex items-center justify-between">
          <div className="flex items-center gap-4">
            <Link
              to="/"
              className="p-2 rounded-lg text-zinc-400 hover:text-white hover:bg-white/5 transition-colors"
            >
              <ArrowLeft size={20} />
            </Link>
            <div>
              <h1 className="text-xl font-bold text-white">프로필</h1>
              <p className="text-sm text-zinc-500">계정 정보 및 마인크래프트 연동</p>
            </div>
          </div>
        </div>
      </header>

      <main className="max-w-4xl mx-auto px-4 sm:px-6 py-6 sm:py-8 space-y-4 sm:space-y-6">
        {/* 프로필 정보 카드 */}
        <section className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
          <h2 className="text-lg font-semibold text-white mb-6 flex items-center gap-2">
            <User size={20} className="text-mc-green" />
            기본 정보
          </h2>
          
          <div className="flex items-center gap-6">
            <img
              src={user.profileUrl || '/default-profile.png'}
              alt="프로필"
              className="w-24 h-24 rounded-2xl object-cover border-2 border-zinc-700"
              onError={(e) => { e.target.src = 'https://via.placeholder.com/96'; }}
            />
            
            <div className="flex-1 space-y-3">
              <div>
                <p className="text-sm text-zinc-500">닉네임</p>
                <p className="text-lg font-medium text-white">{user.name}</p>
              </div>
              <div>
                <p className="text-sm text-zinc-500">이메일</p>
                <p className="text-white flex items-center gap-2">
                  <Mail size={14} className="text-zinc-500" />
                  {user.email}
                </p>
              </div>
            </div>
          </div>
        </section>

        {/* 마인크래프트 연동 카드 */}
        <section className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
          <h2 className="text-lg font-semibold text-white mb-6 flex items-center gap-2">
            <Gamepad2 size={20} className="text-mc-green" />
            마인크래프트 계정 연동
          </h2>
          
          {linkStatus?.linked ? (
            // 연동 완료 상태
            <div className="space-y-6">
              <div className="flex items-center gap-4 p-4 bg-mc-green/10 border border-mc-green/20 rounded-xl">
                <div className="w-12 h-12 rounded-lg bg-mc-green/20 flex items-center justify-center">
                  <Check className="w-6 h-6 text-mc-green" />
                </div>
                <div>
                  <p className="font-medium text-white">연동 완료</p>
                  <p className="text-sm text-zinc-400">
                    마인크래프트 계정: <span className="text-mc-green font-medium">{linkStatus.minecraftName}</span>
                  </p>
                </div>
              </div>
              
              <button
                onClick={() => setShowUnlinkDialog(true)}
                className="flex items-center gap-2 px-4 py-2 text-red-400 hover:bg-red-500/10 rounded-lg transition-colors"
              >
                <Unlink size={16} />
                연동 해제
              </button>
            </div>
          ) : linkToken ? (
            // 연동 대기 상태
            <div className="space-y-6">
              <div className="p-4 bg-yellow-500/10 border border-yellow-500/20 rounded-xl">
                <p className="text-sm text-yellow-400 mb-2">마인크래프트에서 아래 명령어를 입력하세요:</p>
                <div className="flex items-center gap-2">
                  <code className="flex-1 px-4 py-3 bg-zinc-800 rounded-lg text-lg font-mono text-white">
                    {command}
                  </code>
                  <button
                    onClick={handleCopyCommand}
                    className="p-3 bg-mc-green hover:bg-mc-green/80 text-white rounded-lg transition-colors"
                  >
                    {copied ? <Check size={20} /> : <Copy size={20} />}
                  </button>
                </div>
              </div>
              
              <div className="flex items-center gap-3 text-sm text-zinc-400">
                <RefreshCw size={16} className="animate-spin" />
                연동 대기 중... (10분 후 만료)
              </div>
              
              <button
                onClick={() => { setLinkToken(null); setCommand(''); setPolling(false); }}
                className="text-sm text-zinc-500 hover:text-white transition-colors"
              >
                취소
              </button>
            </div>
          ) : (
            // 연동 안됨 상태
            <div className="space-y-6">
              <p className="text-zinc-400">
                마인크래프트 계정을 연동하면 게임 내 닉네임과 스킨이 프로필에 적용됩니다.
              </p>
              
              <button
                onClick={handleRequestLink}
                disabled={isLoading}
                className="flex items-center gap-2 px-6 py-3 bg-mc-green hover:bg-mc-green/80 disabled:bg-zinc-700 text-white font-medium rounded-xl transition-colors"
              >
                {isLoading ? (
                  <RefreshCw size={18} className="animate-spin" />
                ) : (
                  <LinkIcon size={18} />
                )}
                마인크래프트 계정 연동하기
              </button>
            </div>
          )}
        </section>

        {/* 계정 관리 섹션 */}
        <section className="bg-zinc-900 border border-zinc-800 rounded-2xl p-6">
          <h2 className="text-lg font-semibold text-white mb-6 flex items-center gap-2">
            <User size={20} className="text-zinc-400" />
            계정 관리
          </h2>
          
          <div className="space-y-4">
            <div className="p-4 bg-zinc-800/50 border border-zinc-700 rounded-xl">
              <p className="text-sm text-zinc-400 mb-3">
                회원 탈퇴 시 모든 데이터가 삭제되며 복구할 수 없습니다.
              </p>
              <button
                onClick={() => setShowDeleteDialog(true)}
                className="px-4 py-2 text-sm text-red-400 border border-red-500/30 hover:bg-red-500/10 rounded-lg transition-colors"
              >
                회원 탈퇴
              </button>
            </div>
          </div>
        </section>
      </main>

      {/* 연동 해제 다이얼로그 */}
      <AnimatePresence>
        {showUnlinkDialog && (
          <>
            <motion.div
              initial={{ opacity: 0 }}
              animate={{ opacity: 1 }}
              exit={{ opacity: 0 }}
              className="fixed inset-0 bg-black/60 backdrop-blur-sm z-[100]"
              onClick={() => setShowUnlinkDialog(false)}
            />
            <motion.div
              initial={{ opacity: 0, scale: 0.9 }}
              animate={{ opacity: 1, scale: 1 }}
              exit={{ opacity: 0, scale: 0.9 }}
              className="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-80 bg-zinc-900 border border-zinc-700 rounded-2xl p-6 z-[101]"
            >
              <h3 className="text-lg font-bold text-white mb-2">연동 해제</h3>
              <p className="text-sm text-zinc-400 mb-6">
                마인크래프트 계정 연동을 해제하시겠습니까?
              </p>
              <div className="flex gap-3">
                <button
                  onClick={() => setShowUnlinkDialog(false)}
                  className="flex-1 py-2.5 bg-zinc-800 hover:bg-zinc-700 text-zinc-300 rounded-xl font-medium transition-colors"
                >
                  취소
                </button>
                <button
                  onClick={handleUnlink}
                  className="flex-1 py-2.5 bg-red-500 hover:bg-red-600 text-white rounded-xl font-medium transition-colors"
                >
                  연동 해제
                </button>
              </div>
            </motion.div>
          </>
        )}
      </AnimatePresence>

      {/* 탈퇴 확인 다이얼로그 */}
      <AnimatePresence>
        {showDeleteDialog && (
          <>
            <motion.div
              initial={{ opacity: 0 }}
              animate={{ opacity: 1 }}
              exit={{ opacity: 0 }}
              className="fixed inset-0 bg-black/60 backdrop-blur-sm z-[100]"
              onClick={() => setShowDeleteDialog(false)}
            />
            <motion.div
              initial={{ opacity: 0, scale: 0.9 }}
              animate={{ opacity: 1, scale: 1 }}
              exit={{ opacity: 0, scale: 0.9 }}
              className="fixed top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-80 bg-zinc-900 border border-zinc-700 rounded-2xl p-6 z-[101]"
            >
              <h3 className="text-lg font-bold text-red-400 mb-2">⚠️ 회원 탈퇴</h3>
              <p className="text-sm text-zinc-400 mb-6">
                정말 탈퇴하시겠습니까? 모든 데이터가 삭제되며 복구할 수 없습니다.
              </p>
              <div className="flex gap-3">
                <button
                  onClick={() => setShowDeleteDialog(false)}
                  className="flex-1 py-2.5 bg-zinc-800 hover:bg-zinc-700 text-zinc-300 rounded-xl font-medium transition-colors"
                >
                  취소
                </button>
                <button
                  onClick={handleDelete}
                  className="flex-1 py-2.5 bg-red-500 hover:bg-red-600 text-white rounded-xl font-medium transition-colors"
                >
                  탈퇴하기
                </button>
              </div>
            </motion.div>
          </>
        )}
      </AnimatePresence>
    </div>
  );
}