import { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { motion } from 'framer-motion';
import { ArrowLeft, Calendar, Music2, Play, Clock } from 'lucide-react';

function AlbumDetail() {
    const { id } = useParams();
    const navigate = useNavigate();
    const [album, setAlbum] = useState(null);
    const [loading, setLoading] = useState(true);

    useEffect(() => {
        fetch(`/api/albums/${id}`)
            .then(res => res.json())
            .then(data => {
                setAlbum(data);
                setLoading(false);
            })
            .catch(error => {
                console.error('앨범 데이터 로드 오류:', error);
                setLoading(false);
            });
    }, [id]);

    // 날짜 포맷팅
    const formatDate = (dateStr) => {
        if (!dateStr) return '';
        const date = new Date(dateStr);
        return `${date.getFullYear()}.${String(date.getMonth() + 1).padStart(2, '0')}.${String(date.getDate()).padStart(2, '0')}`;
    };

    // 총 재생 시간 계산
    const getTotalDuration = () => {
        if (!album?.tracks) return '';
        let totalSeconds = 0;
        album.tracks.forEach(track => {
            if (track.duration) {
                const parts = track.duration.split(':');
                totalSeconds += parseInt(parts[0]) * 60 + parseInt(parts[1]);
            }
        });
        const mins = Math.floor(totalSeconds / 60);
        const secs = totalSeconds % 60;
        return `${mins}:${String(secs).padStart(2, '0')}`;
    };

    // 뒤로가기
    const handleBack = () => {
        navigate('/discography');
    };

    if (loading) {
        return (
            <motion.div 
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                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>
            </motion.div>
        );
    }

    if (!album) {
        return (
            <div className="py-16 text-center">
                <p className="text-gray-500">앨범을 찾을 수 없습니다.</p>
            </div>
        );
    }

    return (
        <motion.div 
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            transition={{ duration: 0.3 }}
            className="py-16"
        >
            <div className="max-w-7xl mx-auto px-6">
                {/* 뒤로가기 버튼 */}
                <motion.button
                    initial={{ opacity: 0, x: -20 }}
                    animate={{ opacity: 1, x: 0 }}
                    onClick={handleBack}
                    className="flex items-center gap-2 text-gray-500 hover:text-primary mb-8 transition-colors"
                >
                    <ArrowLeft size={20} />
                    <span>앨범으로 돌아가기</span>
                </motion.button>

                {/* 앨범 정보 헤더 */}
                <div className="flex gap-10 mb-10">
                    {/* 앨범 커버 */}
                    <motion.div
                        initial={{ opacity: 0, scale: 0.9 }}
                        animate={{ opacity: 1, scale: 1 }}
                        transition={{ duration: 0.4 }}
                        className="w-72 h-72 flex-shrink-0 rounded-2xl overflow-hidden shadow-2xl"
                    >
                        <img
                            src={album.cover_url}
                            alt={album.title}
                            className="w-full h-full object-cover"
                        />
                    </motion.div>

                    {/* 앨범 정보 */}
                    <motion.div
                        initial={{ opacity: 0, y: 20 }}
                        animate={{ opacity: 1, y: 0 }}
                        transition={{ delay: 0.1, duration: 0.4 }}
                        className="flex-1 pt-2"
                    >
                        <span className="inline-block w-fit px-3 py-1 bg-primary/10 text-primary text-sm font-medium rounded-full mb-3">
                            {album.album_type}
                        </span>
                        <h1 className="text-4xl font-bold mb-4">{album.title}</h1>
                        
                        <div className="flex items-center gap-6 text-gray-500 mb-4">
                            <div className="flex items-center gap-2">
                                <Calendar size={18} />
                                <span>{formatDate(album.release_date)}</span>
                            </div>
                            <div className="flex items-center gap-2">
                                <Music2 size={18} />
                                <span>{album.tracks?.length || 0}곡</span>
                            </div>
                            <div className="flex items-center gap-2">
                                <Clock size={18} />
                                <span>{getTotalDuration()}</span>
                            </div>
                        </div>

                        <p className="text-sm text-primary font-medium">
                            타이틀곡: {album.tracks?.find(t => t.is_title_track === 1)?.title || album.tracks?.[0]?.title}
                        </p>
                    </motion.div>
                </div>

                {/* 2열 그리드: 소개글 + 트랙 리스트 */}
                <div className="grid grid-cols-3 gap-8">
                    {/* 소개글 */}
                    {album.description && (
                        <motion.div
                            initial={{ opacity: 0, y: 30 }}
                            animate={{ opacity: 1, y: 0 }}
                            transition={{ delay: 0.2, duration: 0.4 }}
                            className="col-span-1"
                        >
                            <h2 className="text-xl font-bold mb-4">앨범 소개</h2>
                            <div className="bg-white rounded-2xl shadow-lg p-6">
                                <p className="text-gray-600 leading-relaxed text-sm whitespace-pre-line">
                                    {album.description}
                                </p>
                            </div>
                        </motion.div>
                    )}

                    {/* 트랙 리스트 */}
                    <motion.div
                        initial={{ opacity: 0, y: 30 }}
                        animate={{ opacity: 1, y: 0 }}
                        transition={{ delay: 0.3, duration: 0.4 }}
                        className={album.description ? "col-span-2" : "col-span-3"}
                    >
                        <h2 className="text-xl font-bold mb-4">수록곡</h2>
                        <div className="bg-white rounded-2xl shadow-lg overflow-hidden">
                            {album.tracks?.map((track, index) => (
                                <div
                                    key={track.id}
                                    className={`group flex items-center gap-4 p-4 hover:bg-primary/5 transition-all duration-200 cursor-pointer ${
                                        index !== album.tracks.length - 1 ? 'border-b border-gray-100' : ''
                                    }`}
                                >
                                    {/* 트랙 번호 */}
                                    <div className="w-10 h-10 flex items-center justify-center rounded-full bg-gray-100 group-hover:bg-primary/10 transition-colors">
                                        <span className="text-gray-500 group-hover:text-primary transition-colors">
                                            {String(track.track_number).padStart(2, '0')}
                                        </span>
                                    </div>

                                    {/* 트랙 정보 */}
                                    <div className="flex-1">
                                        <div className="flex items-center gap-2">
                                            <h3 className="font-semibold group-hover:text-primary transition-colors">{track.title}</h3>
                                            {track.is_title_track === 1 && (
                                                <span className="px-2 py-0.5 bg-primary text-white text-xs font-medium rounded-full">
                                                    타이틀
                                                </span>
                                            )}
                                        </div>
                                    </div>

                                    {/* 재생 시간 */}
                                    <div className="text-gray-400 tabular-nums text-sm">
                                        {track.duration || '-'}
                                    </div>
                                </div>
                            ))}
                        </div>
                    </motion.div>
                </div>
            </div>
        </motion.div>
    );
}

export default AlbumDetail;