/**
 * 관리자 페이지
 * - 탭 UI: 콘솔 / 플레이어 / 설정
 */

import { useEffect, useState, useRef } from 'react';
import { useNavigate, useLocation, Link } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';
import { 
  Shield, ArrowLeft, Loader2, Terminal, Users, Settings,
  Send, Ban, UserX, Crown, Sun, Moon, Cloud, CloudRain, CloudLightning,
  ChevronDown, FileText, Download, Trash2, Check
} from 'lucide-react';
import { motion, AnimatePresence } from 'framer-motion';

// 더미 로그 데이터
const DUMMY_LOGS = [
  { time: '15:01:23', type: 'info', message: '[Server] Starting minecraft server version 1.21.1' },
  { time: '15:01:24', type: 'info', message: '[Server] Loading properties' },
  { time: '15:01:25', type: 'info', message: '[Server] Preparing level "world"' },
  { time: '15:01:28', type: 'info', message: '[Server] Done (3.245s)! For help, type "help"' },
  { time: '15:05:12', type: 'info', message: '[Server] 비머[/127.0.0.1:54321] logged in' },
  { time: '15:05:15', type: 'info', message: '[Server] 비머 joined the game' },
  { time: '15:10:30', type: 'warning', message: '[Server] Can\'t keep up! Is the server overloaded?' },
  { time: '15:15:00', type: 'info', message: '[Server] 비머부캐 joined the game' },
];

// 더미 로그 파일 데이터
const DUMMY_LOG_FILES = [
  { name: '2024-12-22.log', size: '2.4 MB', date: '2024-12-22' },
  { name: '2024-12-21.log', size: '1.8 MB', date: '2024-12-21' },
  { name: '2024-12-20.log', size: '3.1 MB', date: '2024-12-20' },
];

// 더미 플레이어 데이터
const DUMMY_PLAYERS = [
  { uuid: '1234-5678-9012-3456', name: '비머', isOnline: true, isOp: true },
  { uuid: '2345-6789-0123-4567', name: '비머부캐', isOnline: true, isOp: false },
  { uuid: '3456-7890-1234-5678', name: 'Steve', isOnline: false, isOp: false },
  { uuid: '4567-8901-2345-6789', name: 'Alex', isOnline: false, isOp: false },
];

// 더미 게임규칙 데이터
const DUMMY_GAMERULES = [
  { name: 'keepInventory', value: false, label: '인벤토리 유지' },
  { name: 'doDaylightCycle', value: true, label: '낮/밤 주기' },
  { name: 'doMobSpawning', value: true, label: '몹 스폰' },
  { name: 'doFireTick', value: true, label: '불 번짐' },
  { name: 'mobGriefing', value: true, label: '몹 그리핑' },
  { name: 'pvp', value: true, label: 'PvP' },
];

export default function Admin({ isMobile = false }) {
  const { isLoggedIn, isAdmin, user, loading } = useAuth();
  const navigate = useNavigate();
  const location = useLocation();
  const [toast, setToast] = useState(null);
  
  // 탭 상태
  const [activeTab, setActiveTab] = useState('console');
  
  // 콘솔 관련 상태
  const [logs, setLogs] = useState(DUMMY_LOGS);
  const [command, setCommand] = useState('');
  const [logFiles] = useState(DUMMY_LOG_FILES);
  const logEndRef = useRef(null);
  
  // 플레이어 관련 상태
  const [players, setPlayers] = useState(DUMMY_PLAYERS);
  const [playerFilter, setPlayerFilter] = useState('all'); // all, online, offline, banned
  const [selectedPlayer, setSelectedPlayer] = useState(null);
  const [showPlayerDialog, setShowPlayerDialog] = useState(false);
  const [dialogAction, setDialogAction] = useState(null); // kick, ban, op
  const [actionReason, setActionReason] = useState('');
  
  // 설정 관련 상태
  const [gamerules, setGamerules] = useState(DUMMY_GAMERULES);
  const [difficulty, setDifficulty] = useState('normal');
  const [timeOfDay, setTimeOfDay] = useState('day');
  const [weather, setWeather] = useState('clear');

  // 권한 확인
  useEffect(() => {
    if (!loading) {
      if (!isLoggedIn) {
        navigate('/login', { state: { from: location.pathname } });
      } else if (!isAdmin) {
        setToast('관리자 권한이 필요합니다.');
        setTimeout(() => navigate('/'), 1500);
      }
    }
  }, [isLoggedIn, isAdmin, loading, navigate, location.pathname]);

  // 토스트 자동 숨기기
  useEffect(() => {
    if (toast) {
      const timer = setTimeout(() => setToast(null), 3000);
      return () => clearTimeout(timer);
    }
  }, [toast]);

  // 로그 스크롤
  useEffect(() => {
    logEndRef.current?.scrollIntoView({ behavior: 'smooth' });
  }, [logs]);

  // 명령어 실행 (더미)
  const handleCommand = () => {
    if (!command.trim()) return;
    
    const newLogs = [
      { time: new Date().toLocaleTimeString('ko-KR', { hour12: false }), type: 'command', message: `> ${command}` },
      { time: new Date().toLocaleTimeString('ko-KR', { hour12: false }), type: 'info', message: `[Server] 명령어 실행됨: ${command}` }
    ];
    
    setLogs(prev => [...prev, ...newLogs]);
    setCommand('');
    setToast('명령어가 실행되었습니다.');
  };

  // 플레이어 액션 핸들러
  const handlePlayerAction = () => {
    if (!selectedPlayer || !dialogAction) return;
    
    let message = '';
    switch (dialogAction) {
      case 'kick':
        message = `${selectedPlayer.name}님을 추방했습니다.`;
        break;
      case 'ban':
        message = `${selectedPlayer.name}님을 차단했습니다.`;
        break;
      case 'op':
        const isOp = players.find(p => p.uuid === selectedPlayer.uuid)?.isOp;
        setPlayers(prev => prev.map(p => 
          p.uuid === selectedPlayer.uuid ? { ...p, isOp: !isOp } : p
        ));
        message = isOp ? `${selectedPlayer.name}님의 OP를 해제했습니다.` : `${selectedPlayer.name}님에게 OP를 부여했습니다.`;
        break;
    }
    
    setShowPlayerDialog(false);
    setSelectedPlayer(null);
    setDialogAction(null);
    setActionReason('');
    setToast(message);
  };

  // 게임규칙 토글
  const toggleGamerule = (name) => {
    setGamerules(prev => prev.map(rule => 
      rule.name === name ? { ...rule, value: !rule.value } : rule
    ));
    setToast('게임규칙이 변경되었습니다.');
  };

  // 로그 색상
  const getLogColor = (type) => {
    switch (type) {
      case 'error': return 'text-red-400';
      case 'warning': return 'text-yellow-400';
      case 'command': return 'text-mc-green';
      default: return 'text-zinc-300';
    }
  };

  // 필터된 플레이어
  const filteredPlayers = players.filter(p => {
    if (playerFilter === 'online') return p.isOnline;
    if (playerFilter === 'offline') return !p.isOnline;
    return true;
  });

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-[60vh]">
        <Loader2 className="w-8 h-8 text-mc-green animate-spin" />
      </div>
    );
  }

  if (!isLoggedIn || !isAdmin) {
    return (
      <>
        <AnimatePresence>
          {toast && (
            <motion.div
              initial={{ opacity: 0, y: 50 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: 50 }}
              className="fixed bottom-8 left-1/2 -translate-x-1/2 z-[200] bg-red-500/90 backdrop-blur-sm text-white px-6 py-3 rounded-xl text-center font-medium shadow-lg"
            >
              {toast}
            </motion.div>
          )}
        </AnimatePresence>
        <div className="flex items-center justify-center min-h-[60vh]">
          <Loader2 className="w-8 h-8 text-mc-green animate-spin" />
        </div>
      </>
    );
  }

  // 탭 설정
  const tabs = [
    { id: 'console', label: '콘솔', icon: Terminal },
    { id: 'players', label: '플레이어', icon: Users },
    { id: 'settings', label: '설정', icon: Settings },
  ];

  return (
    <div className="pb-8">
      {/* 토스트 */}
      <AnimatePresence>
        {toast && (
          <motion.div
            initial={{ opacity: 0, y: 50 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: 50 }}
            className="fixed bottom-8 left-1/2 -translate-x-1/2 z-[200] bg-mc-green/90 backdrop-blur-sm text-white px-6 py-3 rounded-xl text-center font-medium shadow-lg"
          >
            {toast}
          </motion.div>
        )}
      </AnimatePresence>

      {/* 모바일용 헤더 */}
      {isMobile && (
        <header className="bg-mc-dark border-b border-white/10 sticky top-0 z-50 backdrop-blur-xl">
          <div className="flex items-center h-14 px-4">
            <Link to="/" className="p-2 -ml-2 rounded-lg text-zinc-400 hover:text-white hover:bg-white/5 transition-colors">
              <ArrowLeft size={20} />
            </Link>
            <div className="ml-2">
              <h1 className="text-lg font-bold text-white">관리자</h1>
            </div>
          </div>
        </header>
      )}

      <main className={`max-w-4xl mx-auto px-4 sm:px-6 ${isMobile ? 'py-4' : 'py-8'}`}>
        {/* 데스크탑용 타이틀 */}
        {!isMobile && (
          <div className="mb-6">
            <h1 className="text-2xl font-bold text-white">관리자 페이지</h1>
            <p className="text-sm text-zinc-500 mt-1">서버 관리 및 설정</p>
          </div>
        )}

        {/* 탭 네비게이션 */}
        <div className="flex gap-1 p-1 bg-zinc-900 rounded-xl mb-6">
          {tabs.map(tab => (
            <button
              key={tab.id}
              onClick={() => setActiveTab(tab.id)}
              className={`flex-1 flex items-center justify-center gap-2 py-3 px-4 rounded-lg font-medium transition-all ${
                activeTab === tab.id
                  ? 'bg-zinc-800 text-white'
                  : 'text-zinc-400 hover:text-white hover:bg-zinc-800/50'
              }`}
            >
              <tab.icon size={18} />
              <span className={isMobile ? 'hidden sm:inline' : ''}>{tab.label}</span>
            </button>
          ))}
        </div>

        {/* 탭 콘텐츠 */}
        <AnimatePresence mode="wait">
          {/* 콘솔 탭 */}
          {activeTab === 'console' && (
            <motion.div
              key="console"
              initial={{ opacity: 0, y: 10 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -10 }}
              className="space-y-4"
            >
              {/* 로그 영역 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl overflow-hidden">
                <div className="h-80 overflow-y-auto bg-zinc-950 p-4 font-mono text-sm">
                  {logs.map((log, index) => (
                    <div key={index} className={`${getLogColor(log.type)} leading-relaxed`}>
                      <span className="text-zinc-600">[{log.time}]</span> {log.message}
                    </div>
                  ))}
                  <div ref={logEndRef} />
                </div>
                
                {/* 명령어 입력 */}
                <div className="p-4 border-t border-zinc-800 flex gap-2">
                  <div className="flex-1 flex items-center bg-zinc-800 rounded-lg px-3">
                    <span className="text-mc-green mr-2">{'>'}</span>
                    <input
                      type="text"
                      value={command}
                      onChange={(e) => setCommand(e.target.value)}
                      onKeyDown={(e) => e.key === 'Enter' && handleCommand()}
                      placeholder="명령어 입력..."
                      className="flex-1 bg-transparent py-3 text-white placeholder-zinc-500 focus:outline-none font-mono"
                    />
                  </div>
                  <button
                    onClick={handleCommand}
                    disabled={!command.trim()}
                    className="px-4 py-3 bg-mc-green hover:bg-mc-green/80 disabled:bg-zinc-700 disabled:text-zinc-500 text-white rounded-lg transition-colors"
                  >
                    <Send size={18} />
                  </button>
                </div>
              </div>

              {/* 로그 파일 목록 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4">
                <h3 className="text-white font-medium mb-3 flex items-center gap-2">
                  <FileText size={18} className="text-zinc-400" />
                  로그 파일
                </h3>
                <div className="space-y-2">
                  {logFiles.map((file, index) => (
                    <div key={index} className="flex items-center justify-between p-3 bg-zinc-800/50 rounded-xl">
                      <div>
                        <p className="text-white text-sm">{file.name}</p>
                        <p className="text-xs text-zinc-500">{file.size}</p>
                      </div>
                      <div className="flex gap-2">
                        <button className="p-2 text-zinc-400 hover:text-white hover:bg-zinc-700 rounded-lg transition-colors">
                          <Download size={16} />
                        </button>
                        <button className="p-2 text-red-400 hover:text-red-300 hover:bg-red-500/10 rounded-lg transition-colors">
                          <Trash2 size={16} />
                        </button>
                      </div>
                    </div>
                  ))}
                </div>
              </div>
            </motion.div>
          )}

          {/* 플레이어 탭 */}
          {activeTab === 'players' && (
            <motion.div
              key="players"
              initial={{ opacity: 0, y: 10 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -10 }}
              className="space-y-4"
            >
              {/* 필터 */}
              <div className="flex gap-2">
                {[
                  { id: 'all', label: '전체' },
                  { id: 'online', label: '온라인' },
                  { id: 'offline', label: '오프라인' },
                ].map(filter => (
                  <button
                    key={filter.id}
                    onClick={() => setPlayerFilter(filter.id)}
                    className={`px-4 py-2 rounded-lg text-sm font-medium transition-colors ${
                      playerFilter === filter.id
                        ? 'bg-mc-green text-white'
                        : 'bg-zinc-800 text-zinc-400 hover:text-white'
                    }`}
                  >
                    {filter.label}
                  </button>
                ))}
              </div>

              {/* 플레이어 그리드 */}
              <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 gap-4">
                {filteredPlayers.map((player) => (
                  <div
                    key={player.uuid}
                    className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4 text-center relative group"
                  >
                    {/* OP 뱃지 */}
                    {player.isOp && (
                      <div className="absolute top-2 right-2 bg-yellow-500 p-1 rounded-lg">
                        <Crown size={12} className="text-black" />
                      </div>
                    )}
                    
                    {/* 온/오프라인 표시 */}
                    <div className={`absolute top-2 left-2 w-3 h-3 rounded-full ${player.isOnline ? 'bg-green-500' : 'bg-zinc-600'}`} />
                    
                    {/* 전신 아바타 */}
                    <img
                      src={`https://mc-heads.net/body/${player.uuid}/100`}
                      alt={player.name}
                      className="w-16 h-32 mx-auto mb-3 drop-shadow-lg"
                    />
                    
                    <p className="text-white font-medium mb-3">{player.name}</p>
                    
                    {/* 액션 버튼 */}
                    <div className="flex justify-center gap-1">
                      <button
                        onClick={() => {
                          setSelectedPlayer(player);
                          setDialogAction('op');
                          setShowPlayerDialog(true);
                        }}
                        className={`p-2 rounded-lg transition-colors ${
                          player.isOp 
                            ? 'bg-yellow-500/20 text-yellow-500 hover:bg-yellow-500/30'
                            : 'bg-zinc-800 text-zinc-400 hover:text-yellow-500'
                        }`}
                        title="OP"
                      >
                        <Crown size={16} />
                      </button>
                      {player.isOnline && (
                        <button
                          onClick={() => {
                            setSelectedPlayer(player);
                            setDialogAction('kick');
                            setShowPlayerDialog(true);
                          }}
                          className="p-2 bg-zinc-800 text-zinc-400 hover:text-orange-500 rounded-lg transition-colors"
                          title="킥"
                        >
                          <UserX size={16} />
                        </button>
                      )}
                      <button
                        onClick={() => {
                          setSelectedPlayer(player);
                          setDialogAction('ban');
                          setShowPlayerDialog(true);
                        }}
                        className="p-2 bg-zinc-800 text-zinc-400 hover:text-red-500 rounded-lg transition-colors"
                        title="밴"
                      >
                        <Ban size={16} />
                      </button>
                    </div>
                  </div>
                ))}
              </div>
            </motion.div>
          )}

          {/* 설정 탭 */}
          {activeTab === 'settings' && (
            <motion.div
              key="settings"
              initial={{ opacity: 0, y: 10 }}
              animate={{ opacity: 1, y: 0 }}
              exit={{ opacity: 0, y: -10 }}
              className="space-y-4"
            >
              {/* 게임규칙 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4">
                <h3 className="text-white font-medium mb-4">🎮 게임규칙</h3>
                <div className="grid grid-cols-1 sm:grid-cols-2 gap-2">
                  {gamerules.map(rule => (
                    <button
                      key={rule.name}
                      onClick={() => toggleGamerule(rule.name)}
                      className={`flex items-center justify-between p-3 rounded-xl transition-colors border ${
                        rule.value ? 'bg-mc-green/20 border-mc-green/30' : 'bg-zinc-800/50 border-transparent'
                      }`}
                    >
                      <span className="text-white text-sm">{rule.label}</span>
                      <div className={`w-10 h-6 rounded-full relative transition-colors ${rule.value ? 'bg-mc-green' : 'bg-zinc-600'}`}>
                        <div className={`absolute top-1 w-4 h-4 rounded-full bg-white transition-transform ${rule.value ? 'left-5' : 'left-1'}`} />
                      </div>
                    </button>
                  ))}
                </div>
              </div>

              {/* 난이도 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4">
                <h3 className="text-white font-medium mb-4">⚔️ 난이도</h3>
                <div className="flex gap-2 flex-wrap">
                  {[
                    { id: 'peaceful', label: '평화로움' },
                    { id: 'easy', label: '쉬움' },
                    { id: 'normal', label: '보통' },
                    { id: 'hard', label: '어려움' },
                  ].map(d => (
                    <button
                      key={d.id}
                      onClick={() => { setDifficulty(d.id); setToast('난이도가 변경되었습니다.'); }}
                      className={`flex-1 min-w-[80px] py-3 px-4 rounded-xl font-medium transition-colors ${
                        difficulty === d.id
                          ? 'bg-mc-green text-white'
                          : 'bg-zinc-800 text-zinc-400 hover:text-white'
                      }`}
                    >
                      {d.label}
                    </button>
                  ))}
                </div>
              </div>

              {/* 시간 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4">
                <h3 className="text-white font-medium mb-4">🕐 시간</h3>
                <div className="flex gap-2 flex-wrap">
                  {[
                    { id: 'day', label: '아침', icon: Sun },
                    { id: 'noon', label: '낮', icon: Sun },
                    { id: 'night', label: '밤', icon: Moon },
                  ].map(t => (
                    <button
                      key={t.id}
                      onClick={() => { setTimeOfDay(t.id); setToast('시간이 변경되었습니다.'); }}
                      className={`flex-1 flex items-center justify-center gap-2 py-3 px-4 rounded-xl font-medium transition-colors ${
                        timeOfDay === t.id
                          ? 'bg-blue-500 text-white'
                          : 'bg-zinc-800 text-zinc-400 hover:text-white'
                      }`}
                    >
                      <t.icon size={18} />
                      {t.label}
                    </button>
                  ))}
                </div>
              </div>

              {/* 날씨 */}
              <div className="bg-zinc-900 border border-zinc-800 rounded-2xl p-4">
                <h3 className="text-white font-medium mb-4">🌤️ 날씨</h3>
                <div className="flex gap-2 flex-wrap">
                  {[
                    { id: 'clear', label: '맑음', icon: Sun },
                    { id: 'rain', label: '비', icon: CloudRain },
                    { id: 'thunder', label: '천둥', icon: CloudLightning },
                  ].map(w => (
                    <button
                      key={w.id}
                      onClick={() => { setWeather(w.id); setToast('날씨가 변경되었습니다.'); }}
                      className={`flex-1 flex items-center justify-center gap-2 py-3 px-4 rounded-xl font-medium transition-colors ${
                        weather === w.id
                          ? 'bg-cyan-500 text-white'
                          : 'bg-zinc-800 text-zinc-400 hover:text-white'
                      }`}
                    >
                      <w.icon size={18} />
                      {w.label}
                    </button>
                  ))}
                </div>
              </div>
            </motion.div>
          )}
        </AnimatePresence>
      </main>

      {/* 플레이어 액션 다이얼로그 */}
      <AnimatePresence>
        {showPlayerDialog && selectedPlayer && (
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            className="fixed inset-0 bg-black/60 backdrop-blur-sm z-[100] flex items-center justify-center p-4"
            onClick={() => setShowPlayerDialog(false)}
          >
            <motion.div
              initial={{ scale: 0.9, opacity: 0 }}
              animate={{ scale: 1, opacity: 1 }}
              exit={{ scale: 0.9, opacity: 0 }}
              className="bg-zinc-900 border border-zinc-700 rounded-2xl p-6 w-full max-w-md"
              onClick={(e) => e.stopPropagation()}
            >
              <h3 className="text-lg font-semibold text-white mb-4 flex items-center gap-2">
                {dialogAction === 'kick' && <><UserX size={20} className="text-orange-500" /> 플레이어 킥</>}
                {dialogAction === 'ban' && <><Ban size={20} className="text-red-500" /> 플레이어 밴</>}
                {dialogAction === 'op' && <><Crown size={20} className="text-yellow-500" /> OP {players.find(p => p.uuid === selectedPlayer.uuid)?.isOp ? '해제' : '부여'}</>}
              </h3>
              
              <div className="flex items-center gap-4 mb-4">
                <img
                  src={`https://mc-heads.net/body/${selectedPlayer.uuid}/60`}
                  alt={selectedPlayer.name}
                  className="w-10 h-20"
                />
                <div>
                  <p className="text-white font-medium">{selectedPlayer.name}</p>
                  <p className="text-xs text-zinc-500">{selectedPlayer.uuid}</p>
                </div>
              </div>

              {(dialogAction === 'kick' || dialogAction === 'ban') && (
                <input
                  type="text"
                  value={actionReason}
                  onChange={(e) => setActionReason(e.target.value)}
                  placeholder="사유 (선택)"
                  className="w-full bg-zinc-800 rounded-xl p-3 text-white placeholder-zinc-500 focus:outline-none focus:ring-2 focus:ring-mc-green/50 mb-4"
                />
              )}

              <div className="flex gap-2">
                <button
                  onClick={() => setShowPlayerDialog(false)}
                  className="flex-1 py-3 bg-zinc-800 hover:bg-zinc-700 text-white rounded-xl transition-colors"
                >
                  취소
                </button>
                <button
                  onClick={handlePlayerAction}
                  className={`flex-1 py-3 font-medium rounded-xl transition-colors ${
                    dialogAction === 'kick' ? 'bg-orange-500 hover:bg-orange-600 text-white' :
                    dialogAction === 'ban' ? 'bg-red-500 hover:bg-red-600 text-white' :
                    'bg-yellow-500 hover:bg-yellow-600 text-black'
                  }`}
                >
                  확인
                </button>
              </div>
            </motion.div>
          </motion.div>
        )}
      </AnimatePresence>
    </div>
  );
}