import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import { motion } from 'framer-motion';
import { Calendar, Music } from 'lucide-react';
import { getAlbums } from '../../../api/public/albums';
import { formatDate } from '../../../utils/date';

function Album() {
    const navigate = useNavigate();
    const [albums, setAlbums] = useState([]);
    const [loading, setLoading] = useState(true);

    useEffect(() => {
        getAlbums()
            .then(data => {
                setAlbums(data);
                setLoading(false);
            })
            .catch(error => {
                console.error('앨범 데이터 로드 오류:', error);
                setLoading(false);
            });
    }, []);

    // 타이틀곡 찾기
    const getTitleTrack = (tracks) => {
        if (!tracks || tracks.length === 0) return '';
        const titleTrack = tracks.find(t => t.is_title_track);
        return titleTrack ? titleTrack.title : tracks[0].title;
    };

    // 앨범 타입별 개수 계산 (album_type_short 우선 사용)
    const getAlbumType = (album) => album.album_type_short || album.album_type;
    const albumStats = {
        정규: albums.filter(a => getAlbumType(a) === '정규').length,
        미니: albums.filter(a => getAlbumType(a) === '미니').length,
        싱글: albums.filter(a => getAlbumType(a) === '싱글').length,
        총: albums.length
    };

    // 앨범 클릭 핸들러
    const handleAlbumClick = (albumTitle) => {
        navigate(`/album/${encodeURIComponent(albumTitle)}`);
    };

    if (loading) {
        return (
            <div className="py-16 flex justify-center items-center min-h-[60vh]">
                <div className="animate-spin rounded-full h-12 w-12 border-4 border-primary border-t-transparent"></div>
            </div>
        );
    }

    return (
        <div className="py-16">
            <div className="max-w-7xl mx-auto px-6">
                {/* 헤더 */}
                <div className="text-center mb-8">
                    <motion.h1
                        initial={{ opacity: 0, y: -20 }}
                        animate={{ opacity: 1, y: 0 }}
                        className="text-4xl font-bold mb-4"
                    >
                        앨범
                    </motion.h1>
                    <motion.p
                        initial={{ opacity: 0 }}
                        animate={{ opacity: 1 }}
                        transition={{ delay: 0.2 }}
                        className="text-gray-500"
                    >
                        프로미스나인의 음악을 만나보세요
                    </motion.p>
                </div>

                {/* 통계 - 상단 배치 */}
                <motion.div
                    initial={{ opacity: 0, y: 20 }}
                    animate={{ opacity: 1, y: 0 }}
                    transition={{ delay: 0.3 }}
                    className="mb-12 grid grid-cols-4 gap-4"
                >
                    <div className="bg-gray-50 rounded-xl p-4 text-center">
                        <p className="text-2xl font-bold text-primary mb-1">{albumStats.정규}</p>
                        <p className="text-gray-500 text-sm">정규 앨범</p>
                    </div>
                    <div className="bg-gray-50 rounded-xl p-4 text-center">
                        <p className="text-2xl font-bold text-primary mb-1">{albumStats.미니}</p>
                        <p className="text-gray-500 text-sm">미니 앨범</p>
                    </div>
                    <div className="bg-gray-50 rounded-xl p-4 text-center">
                        <p className="text-2xl font-bold text-primary mb-1">{albumStats.싱글}</p>
                        <p className="text-gray-500 text-sm">싱글 앨범</p>
                    </div>
                    <div className="bg-gray-50 rounded-xl p-4 text-center">
                        <p className="text-2xl font-bold text-primary mb-1">{albumStats.총}</p>
                        <p className="text-gray-500 text-sm">총 앨범</p>
                    </div>
                </motion.div>

                {/* 앨범 그리드 */}
                <div className="grid grid-cols-4 gap-8">
                    {albums.map((album, index) => (
                        <motion.div
                            key={album.id}
                            initial={{ opacity: 0, y: 30 }}
                            animate={{ opacity: 1, y: 0 }}
                            transition={{ delay: index * 0.1, duration: 0.3 }}
                            className="group bg-white rounded-2xl overflow-hidden shadow-lg hover:shadow-2xl transition-shadow duration-300 cursor-pointer"
                            onClick={() => handleAlbumClick(album.title)}
                        >
                            {/* 앨범 커버 */}
                            <div 
                                className="relative aspect-square bg-gray-100 overflow-hidden"
                                style={{ viewTransitionName: `album-cover-${album.id}` }}
                            >
                                <img
                                    src={album.cover_medium_url || album.cover_original_url}
                                    alt={album.title}
                                    loading="lazy"
                                    className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500 will-change-transform"
                                />

                                {/* 호버 오버레이 */}
                                <div className="absolute inset-0 bg-black/50 opacity-0 group-hover:opacity-100 transition-opacity duration-300 flex items-center justify-center">
                                    <div className="text-center text-white">
                                        <Music size={40} className="mx-auto mb-2" />
                                        <p className="text-sm">{album.tracks?.length || 0}곡 수록</p>
                                    </div>
                                </div>
                            </div>

                            {/* 앨범 정보 */}
                            <div className="p-6">
                                <div className="flex items-center gap-2 mb-1">
                                    <h3 className="font-bold text-lg truncate flex-1">{album.title}</h3>
                                    <span className="px-2 py-0.5 bg-primary/10 text-primary text-xs font-medium rounded-full flex-shrink-0">
                                        {album.album_type_short || album.album_type}
                                    </span>
                                </div>
                                <p className="text-primary text-sm font-medium mb-3">
                                    {getTitleTrack(album.tracks)}
                                </p>
                                <div className="flex items-center gap-2 text-sm text-gray-500">
                                    <Calendar size={14} />
                                    <span>{formatDate(album.release_date, 'YYYY.MM.DD')}</span>
                                </div>
                            </div>
                        </motion.div>
                    ))}
                </div>
            </div>
        </div>
    );
}

export default Album;