import { useState, useEffect } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import { motion, AnimatePresence } from 'framer-motion';
import { 
    LogOut, Home, ChevronRight, Bot, Play, Square,
    Youtube, Calendar, Clock, CheckCircle, XCircle, RefreshCw, Download
} from 'lucide-react';
import Toast from '../../../components/Toast';
import Tooltip from '../../../components/Tooltip';
import * as botsApi from '../../../api/admin/bots';

function AdminScheduleBots() {
    const navigate = useNavigate();
    const [user, setUser] = useState(null);
    const [toast, setToast] = useState(null);
    const [bots, setBots] = useState([]);
    const [loading, setLoading] = useState(true);
    const [isInitialLoad, setIsInitialLoad] = useState(true); // 첫 로드 여부 (애니메이션용)
    const [syncing, setSyncing] = useState(null); // 동기화 중인 봇 ID
    const [quotaWarning, setQuotaWarning] = useState(null); // 할당량 경고 상태

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

    useEffect(() => {
        const token = localStorage.getItem('adminToken');
        const userData = localStorage.getItem('adminUser');

        if (!token || !userData) {
            navigate('/admin');
            return;
        }

        setUser(JSON.parse(userData));
        fetchBots();
        fetchQuotaWarning();
    }, [navigate]);

    // 봇 목록 조회
    const fetchBots = async () => {
        setLoading(true);
        try {
            const data = await botsApi.getBots();
            setBots(data);
        } catch (error) {
            console.error('봇 목록 조회 오류:', error);
            setToast({ type: 'error', message: '봇 목록을 불러올 수 없습니다.' });
        } finally {
            setLoading(false);
        }
    };

    // 할당량 경고 상태 조회
    const fetchQuotaWarning = async () => {
        try {
            const data = await botsApi.getQuotaWarning();
            if (data.active) {
                setQuotaWarning(data);
            }
        } catch (error) {
            console.error('할당량 경고 조회 오류:', error);
        }
    };

    // 할당량 경고 해제
    const handleDismissQuotaWarning = async () => {
        try {
            await botsApi.dismissQuotaWarning();
            setQuotaWarning(null);
        } catch (error) {
            console.error('할당량 경고 해제 오류:', error);
        }
    };

    const handleLogout = () => {
        localStorage.removeItem('adminToken');
        localStorage.removeItem('adminUser');
        navigate('/admin');
    };

    // 봇 시작/정지 토글
    const toggleBot = async (botId, currentStatus, botName) => {
        try {
            const action = currentStatus === 'running' ? 'stop' : 'start';
            
            if (action === 'start') {
                await botsApi.startBot(botId);
            } else {
                await botsApi.stopBot(botId);
            }
            
            // 로컬 상태만 업데이트 (전체 목록 새로고침 대신)
            setBots(prev => prev.map(bot => 
                bot.id === botId 
                    ? { ...bot, status: action === 'start' ? 'running' : 'stopped' }
                    : bot
            ));
            setToast({ 
                type: 'success', 
                message: action === 'start' ? `${botName} 봇이 시작되었습니다.` : `${botName} 봇이 정지되었습니다.`
            });
        } catch (error) {
            console.error('봇 토글 오류:', error);
            setToast({ type: 'error', message: error.message || '작업 중 오류가 발생했습니다.' });
        }
    };

    // 전체 동기화
    const handleSyncAllVideos = async (botId) => {
        setSyncing(botId);
        try {
            const data = await botsApi.syncAllVideos(botId);
            setToast({ 
                type: 'success', 
                message: `${data.addedCount}개 일정이 추가되었습니다. (전체 ${data.total}개)`
            });
            fetchBots();
        } catch (error) {
            console.error('전체 동기화 오류:', error);
            setToast({ type: 'error', message: error.message || '동기화 중 오류가 발생했습니다.' });
            fetchBots();
        } finally {
            setSyncing(null);
        }
    };


    // 상태 아이콘 및 색상
    const getStatusInfo = (status) => {
        switch (status) {
            case 'running':
                return { 
                    icon: <CheckCircle size={16} />, 
                    text: '실행 중', 
                    color: 'text-green-500',
                    bg: 'bg-green-50',
                    dot: 'bg-green-500',
                };
            case 'stopped':
                return { 
                    icon: <XCircle size={16} />, 
                    text: '정지됨', 
                    color: 'text-gray-400',
                    bg: 'bg-gray-50',
                    dot: 'bg-gray-400',
                };
            case 'error':
                return { 
                    icon: <XCircle size={16} />, 
                    text: '오류', 
                    color: 'text-red-500',
                    bg: 'bg-red-50',
                    dot: 'bg-red-500',
                };
            default:
                return { 
                    icon: null, 
                    text: '알 수 없음', 
                    color: 'text-gray-400',
                    bg: 'bg-gray-50',
                    dot: 'bg-gray-400',
                };
        }
    };

    // 시간 포맷 (DB에 KST로 저장되어 있으므로 그대로 표시)
    const formatTime = (dateString) => {
        if (!dateString) return '-';
        // DB의 KST 시간을 UTC로 재해석하지 않도록 Z 접미사 제거
        const cleanDateString = dateString.replace('Z', '').replace('T', ' ');
        const date = new Date(cleanDateString);
        return date.toLocaleString('ko-KR', { 
            month: 'short', 
            day: 'numeric', 
            hour: '2-digit', 
            minute: '2-digit' 
        });
    };

    // 간격 포맷 (분 → 분/시간/일)
    const formatInterval = (minutes) => {
        if (!minutes) return '-';
        if (minutes >= 1440) {
            const days = Math.floor(minutes / 1440);
            return `${days}일`;
        } else if (minutes >= 60) {
            const hours = Math.floor(minutes / 60);
            return `${hours}시간`;
        }
        return `${minutes}분`;
    };

    return (
        <div className="min-h-screen bg-gray-50">
            <Toast toast={toast} onClose={() => setToast(null)} />

            {/* 헤더 */}
            <header className="bg-white shadow-sm border-b border-gray-100">
                <div className="max-w-7xl mx-auto px-6 py-4 flex items-center justify-between">
                    <div className="flex items-center gap-4">
                        <Link to="/admin/dashboard" className="text-2xl font-bold text-primary hover:opacity-80 transition-opacity">
                            fromis_9
                        </Link>
                        <span className="px-3 py-1 bg-primary/10 text-primary text-sm font-medium rounded-full">
                            Admin
                        </span>
                    </div>
                    <div className="flex items-center gap-4">
                        <span className="text-gray-500 text-sm">
                            안녕하세요, <span className="text-gray-900 font-medium">{user?.username}</span>님
                        </span>
                        <button
                            onClick={handleLogout}
                            className="flex items-center gap-2 px-4 py-2 text-gray-500 hover:text-gray-900 hover:bg-gray-100 rounded-lg transition-colors"
                        >
                            <LogOut size={18} />
                            <span>로그아웃</span>
                        </button>
                    </div>
                </div>
            </header>

            {/* 메인 콘텐츠 */}
            <main className="max-w-7xl mx-auto px-6 py-8">
                {/* 브레드크럼 */}
                <div className="flex items-center gap-2 text-sm text-gray-400 mb-8">
                    <Link to="/admin/dashboard" className="hover:text-primary transition-colors">
                        <Home size={16} />
                    </Link>
                    <ChevronRight size={14} />
                    <Link to="/admin/schedule" className="hover:text-primary transition-colors">
                        일정 관리
                    </Link>
                    <ChevronRight size={14} />
                    <span className="text-gray-700">봇 관리</span>
                </div>

                {/* 타이틀 */}
                <div className="mb-8">
                    <h1 className="text-3xl font-bold text-gray-900 mb-2">봇 관리</h1>
                    <p className="text-gray-500">일정 자동화 봇을 관리합니다</p>
                </div>

                {/* 봇 통계 */}
                <div className="grid grid-cols-4 gap-4 mb-8">
                    <div className="bg-white rounded-xl p-5 border border-gray-100">
                        <div className="text-sm text-gray-500 mb-1">전체 봇</div>
                        <div className="text-2xl font-bold text-gray-900">{bots.length}</div>
                    </div>
                    <div className="bg-white rounded-xl p-5 border border-gray-100">
                        <div className="text-sm text-gray-500 mb-1">실행 중</div>
                        <div className="text-2xl font-bold text-green-500">
                            {bots.filter(b => b.status === 'running').length}
                        </div>
                    </div>
                    <div className="bg-white rounded-xl p-5 border border-gray-100">
                        <div className="text-sm text-gray-500 mb-1">정지됨</div>
                        <div className="text-2xl font-bold text-gray-400">
                            {bots.filter(b => b.status === 'stopped').length}
                        </div>
                    </div>
                    <div className="bg-white rounded-xl p-5 border border-gray-100">
                        <div className="text-sm text-gray-500 mb-1">오류</div>
                        <div className="text-2xl font-bold text-red-500">
                            {bots.filter(b => b.status === 'error').length}
                        </div>
                    </div>
                </div>

                {/* API 할당량 경고 배너 */}
                {quotaWarning && (
                    <div className="bg-red-50 border border-red-200 rounded-xl p-4 mb-8 flex items-start justify-between">
                        <div className="flex items-start gap-3">
                            <div className="w-8 h-8 rounded-full bg-red-100 flex items-center justify-center flex-shrink-0">
                                <XCircle size={18} className="text-red-500" />
                            </div>
                            <div>
                                <h3 className="font-bold text-red-700">YouTube API 할당량 경고</h3>
                                <p className="text-sm text-red-600 mt-0.5">
                                    {quotaWarning.message}
                                </p>
                            </div>
                        </div>
                        <button 
                            onClick={handleDismissQuotaWarning}
                            className="text-red-400 hover:text-red-600 transition-colors text-sm px-2 py-1"
                        >
                            닫기
                        </button>
                    </div>
                )}

                {/* 봇 목록 */}
                <div className="bg-white rounded-2xl shadow-sm border border-gray-100 overflow-hidden">
                    <div className="px-6 py-4 border-b border-gray-100 flex items-center justify-between">
                        <h2 className="font-bold text-gray-900">봇 목록</h2>
                        <Tooltip text="새로고침">
                            <button
                                onClick={() => { setIsInitialLoad(true); fetchBots(); }}
                                disabled={loading}
                                className="p-2 hover:bg-gray-100 rounded-lg transition-colors text-gray-500 hover:text-gray-700 disabled:opacity-50"
                            >
                                <RefreshCw size={18} className={loading ? 'animate-spin' : ''} />
                            </button>
                        </Tooltip>
                    </div>

                    
                    {loading ? (
                        <div className="flex justify-center items-center py-20">
                            <div className="animate-spin rounded-full h-10 w-10 border-4 border-primary border-t-transparent"></div>
                        </div>
                    ) : bots.length === 0 ? (
                        <div className="text-center py-20 text-gray-400">
                            <Bot size={48} className="mx-auto mb-4 opacity-30" />
                            <p>등록된 봇이 없습니다</p>
                            <p className="text-sm mt-1">위의 버튼을 클릭하여 봇을 추가하세요</p>
                        </div>
                    ) : (
                        <div className="p-6 grid grid-cols-1 lg:grid-cols-2 gap-4">
                            {bots.map((bot, index) => {
                                const statusInfo = getStatusInfo(bot.status);
                                
                                return (
                                    <motion.div
                                        key={bot.id}
                                        initial={isInitialLoad ? { opacity: 0, scale: 0.95 } : false}
                                        animate={{ opacity: 1, scale: 1 }}
                                        transition={isInitialLoad ? { delay: index * 0.05 } : { duration: 0.15 }}
                                        onAnimationComplete={() => isInitialLoad && index === bots.length - 1 && setIsInitialLoad(false)}
                                        className="relative bg-gradient-to-br from-gray-50 to-white rounded-xl border border-gray-200 overflow-hidden hover:shadow-md transition-all"
                                    >
                                        {/* 상단 헤더 */}
                                        <div className="flex items-center justify-between p-4 border-b border-gray-100">
                                            <div className="flex items-center gap-3">
                                                <div className="w-10 h-10 rounded-lg bg-red-50 flex items-center justify-center">
                                                    <Youtube size={20} className="text-red-500" />
                                                </div>
                                                <div>
                                                    <h3 className="font-bold text-gray-900">{bot.name}</h3>
                                                    <p className="text-xs text-gray-400">
                                                        {bot.last_check_at ? `${formatTime(bot.last_check_at)}에 업데이트됨` : '아직 업데이트 없음'}
                                                    </p>
                                                </div>
                                            </div>
                                            <span className={`flex items-center gap-1.5 px-2.5 py-1 text-xs font-medium rounded-full ${statusInfo.bg} ${statusInfo.color}`}>
                                                <span className={`w-1.5 h-1.5 rounded-full ${statusInfo.dot} ${bot.status === 'running' ? 'animate-pulse' : ''}`}></span>
                                                {statusInfo.text}
                                            </span>
                                        </div>
                                        
                                        {/* 통계 정보 */}
                                        <div className="grid grid-cols-3 divide-x divide-gray-100 bg-gray-50/50">
                                            <div className="p-3 text-center">
                                                <div className="text-lg font-bold text-gray-900">{bot.schedules_added}</div>
                                                <div className="text-xs text-gray-400">총 추가</div>
                                            </div>
                                            <div className="p-3 text-center">
                                                <div className={`text-lg font-bold ${bot.last_added_count > 0 ? 'text-green-500' : 'text-gray-400'}`}>
                                                    +{bot.last_added_count || 0}
                                                </div>
                                                <div className="text-xs text-gray-400">마지막</div>
                                            </div>
                                            <div className="p-3 text-center">
                                                <div className="text-lg font-bold text-gray-900">{formatInterval(bot.check_interval)}</div>
                                                <div className="text-xs text-gray-400">업데이트 간격</div>
                                            </div>
                                        </div>


                                        
                                        {/* 오류 메시지 */}
                                        {bot.status === 'error' && bot.error_message && (
                                            <div className="px-4 py-2 bg-red-50 text-red-600 text-xs border-t border-red-100">
                                                ⚠️ {bot.error_message}
                                            </div>
                                        )}
                                        
                                        {/* 액션 버튼 */}
                                        <div className="p-4 border-t border-gray-100">
                                            <div className="flex gap-2">
                                            <button
                                                onClick={() => handleSyncAllVideos(bot.id)}
                                                disabled={syncing === bot.id}
                                                className="flex-1 flex items-center justify-center gap-2 px-4 py-2.5 bg-blue-500 text-white rounded-lg font-medium transition-colors hover:bg-blue-600 disabled:opacity-50"
                                            >
                                                {syncing === bot.id ? (
                                                    <>
                                                        <RefreshCw size={16} className="animate-spin" />
                                                        <span>동기화 중...</span>
                                                    </>
                                                ) : (
                                                    <>
                                                        <Download size={16} />
                                                        <span>전체 동기화</span>
                                                    </>
                                                )}
                                            </button>
                                            <button
                                                onClick={() => toggleBot(bot.id, bot.status, bot.name)}
                                                className={`flex items-center justify-center gap-2 px-4 py-2.5 rounded-lg font-medium transition-colors ${
                                                    bot.status === 'running'
                                                        ? 'bg-gray-100 text-gray-600 hover:bg-gray-200'
                                                        : 'bg-green-500 text-white hover:bg-green-600'
                                                }`}
                                            >
                                                {bot.status === 'running' ? (
                                                    <>
                                                        <Square size={16} />
                                                        <span>정지</span>
                                                    </>
                                                ) : (
                                                    <>
                                                        <Play size={16} />
                                                        <span>시작</span>
                                                    </>
                                                )}
                                            </button>
                                            </div>
                                        </div>
                                    </motion.div>

                                );
                            })}
                        </div>
                    )}

                </div>
            </main>
        </div>
    );
}

export default AdminScheduleBots;