import { useState, useMemo } from 'react';
import { useParams, useNavigate, Link } from 'react-router-dom';
import { useQuery } from '@tanstack/react-query';
import { motion } from 'framer-motion';
import { Clock, User, Music, Mic2, Play, ExternalLink, ChevronRight, Disc3 } from 'lucide-react';
import { getTrack } from '../../../api/public/albums';
import { formatDate } from '../../../utils/date';

// PC 곡 상세 페이지
function TrackDetail() {
    const { name: albumName, trackTitle } = useParams();
    const navigate = useNavigate();

    // useQuery로 트랙 데이터 로드
    const { data: track, isLoading: loading, error } = useQuery({
        queryKey: ['track', albumName, trackTitle],
        queryFn: () => getTrack(albumName, trackTitle),
        enabled: !!albumName && !!trackTitle,
    });

    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 (error || !track) {
        return (
            <div className="py-16 text-center">
                <p className="text-gray-500">트랙을 찾을 수 없습니다.</p>
            </div>
        );
    }

    return (
        <motion.div 
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            transition={{ duration: 0.3 }}
        >
            {/* 히어로 섹션 - 그라데이션 배경 */}
            <div className="relative bg-gradient-to-b from-primary/10 via-primary/5 to-white pt-10 pb-16">
                <div className="max-w-5xl mx-auto px-6">
                    {/* 브레드크럼 네비게이션 */}
                    <div className="flex items-center gap-2 text-sm text-gray-500 mb-8">
                        <Link to="/album" className="hover:text-primary transition-colors">
                            앨범
                        </Link>
                        <ChevronRight size={14} />
                        <Link 
                            to={`/album/${encodeURIComponent(track.album?.title || albumName)}`}
                            className="hover:text-primary transition-colors"
                        >
                            {track.album?.title}
                        </Link>
                        <ChevronRight size={14} />
                        <span className="text-gray-700 font-medium">{track.title}</span>
                    </div>

                    {/* 트랙 정보 헤더 */}
                    <div className="flex gap-10 items-start">
                        {/* 앨범 커버 */}
                        <motion.div
                            initial={{ opacity: 0, scale: 0.9 }}
                            animate={{ opacity: 1, scale: 1 }}
                            transition={{ duration: 0.4 }}
                            className="relative group"
                        >
                            <div 
                                className="w-64 h-64 rounded-2xl overflow-hidden shadow-2xl cursor-pointer"
                                onClick={() => navigate(`/album/${encodeURIComponent(track.album?.title || albumName)}`)}
                            >
                                <img
                                    src={track.album?.cover_medium_url}
                                    alt={track.album?.title}
                                    className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500"
                                />
                            </div>
                            {/* 재생 느낌의 오버레이 */}
                            <div className="absolute -bottom-3 -right-3 w-14 h-14 bg-primary rounded-full shadow-lg flex items-center justify-center">
                                <Disc3 size={28} className="text-white animate-spin" style={{ animationDuration: '3s' }} />
                            </div>
                        </motion.div>

                        {/* 트랙 정보 */}
                        <motion.div
                            initial={{ opacity: 0, y: 20 }}
                            animate={{ opacity: 1, y: 0 }}
                            transition={{ delay: 0.1, duration: 0.4 }}
                            className="flex-1 pt-4"
                        >
                            <div className="flex items-center gap-3 mb-4">
                                {track.is_title_track === 1 && (
                                    <span className="px-4 py-1.5 bg-gradient-to-r from-primary to-primary-dark text-white text-sm font-bold rounded-full shadow-md">
                                        TITLE
                                    </span>
                                )}
                                <span className="px-3 py-1 bg-white/80 backdrop-blur-sm text-gray-600 text-sm rounded-full shadow-sm">
                                    Track {String(track.track_number).padStart(2, '0')}
                                </span>
                            </div>
                            
                            <h1 className="text-5xl font-bold mb-5 text-gray-900">{track.title}</h1>
                            
                            {/* 앨범 정보 카드 */}
                            <Link 
                                to={`/album/${encodeURIComponent(track.album?.title || albumName)}`}
                                className="inline-flex items-center gap-4 px-5 py-3 bg-white/70 backdrop-blur-sm rounded-2xl shadow-sm hover:shadow-md transition-all group mb-6"
                            >
                                <img 
                                    src={track.album?.cover_thumb_url} 
                                    alt="" 
                                    className="w-12 h-12 rounded-lg object-cover"
                                />
                                <div>
                                    <p className="text-xs text-gray-400 mb-0.5">{track.album?.album_type}</p>
                                    <p className="font-semibold text-gray-800 group-hover:text-primary transition-colors">{track.album?.title}</p>
                                </div>
                                <ChevronRight size={18} className="text-gray-400 group-hover:text-primary transition-colors" />
                            </Link>

                            {/* 재생 시간 & 뮤비 */}
                            <div className="flex items-center gap-4">
                                {track.duration && (
                                    <div className="flex items-center gap-2 text-gray-500">
                                        <Clock size={18} />
                                        <span className="font-medium">{track.duration}</span>
                                    </div>
                                )}
                                {track.music_video_url && (
                                    <a
                                        href={track.music_video_url}
                                        target="_blank"
                                        rel="noopener noreferrer"
                                        className="inline-flex items-center gap-2 px-5 py-2.5 bg-gradient-to-r from-red-500 to-red-600 text-white rounded-full hover:from-red-600 hover:to-red-700 transition-all shadow-lg hover:shadow-xl"
                                    >
                                        <Play size={18} fill="currentColor" />
                                        뮤직비디오
                                        <ExternalLink size={14} />
                                    </a>
                                )}
                            </div>
                        </motion.div>
                    </div>
                </div>
            </div>

            {/* 메인 콘텐츠 */}
            <div className="max-w-5xl mx-auto px-6 py-10">
                <div className="grid grid-cols-3 gap-8">
                    {/* 왼쪽: 크레딧 + 수록곡 */}
                    <div className="col-span-1 space-y-6">
                        {/* 크레딧 */}
                        {(track.lyricist || track.composer || track.arranger) && (
                            <motion.div
                                initial={{ opacity: 0, y: 20 }}
                                animate={{ opacity: 1, y: 0 }}
                                transition={{ delay: 0.2, duration: 0.4 }}
                                className="bg-gradient-to-br from-gray-50 to-gray-100 rounded-2xl p-6 border border-gray-100"
                            >
                                <h2 className="text-lg font-bold mb-5 flex items-center gap-2">
                                    <div className="w-1 h-5 bg-primary rounded-full"></div>
                                    크레딧
                                </h2>
                                <div className="space-y-5">
                                    {track.lyricist && (
                                        <div className="flex items-start gap-4">
                                            <div className="w-10 h-10 bg-gradient-to-br from-primary/20 to-primary/10 rounded-xl flex items-center justify-center flex-shrink-0">
                                                <Mic2 size={18} className="text-primary" />
                                            </div>
                                            <div className="flex-1">
                                                <p className="text-xs text-gray-400 font-medium mb-1">작사</p>
                                                <p className="text-sm text-gray-700 leading-relaxed">{track.lyricist}</p>
                                            </div>
                                        </div>
                                    )}
                                    {track.composer && (
                                        <div className="flex items-start gap-4">
                                            <div className="w-10 h-10 bg-gradient-to-br from-blue-100 to-blue-50 rounded-xl flex items-center justify-center flex-shrink-0">
                                                <Music size={18} className="text-blue-500" />
                                            </div>
                                            <div className="flex-1">
                                                <p className="text-xs text-gray-400 font-medium mb-1">작곡</p>
                                                <p className="text-sm text-gray-700 leading-relaxed">{track.composer}</p>
                                            </div>
                                        </div>
                                    )}
                                    {track.arranger && (
                                        <div className="flex items-start gap-4">
                                            <div className="w-10 h-10 bg-gradient-to-br from-purple-100 to-purple-50 rounded-xl flex items-center justify-center flex-shrink-0">
                                                <User size={18} className="text-purple-500" />
                                            </div>
                                            <div className="flex-1">
                                                <p className="text-xs text-gray-400 font-medium mb-1">편곡</p>
                                                <p className="text-sm text-gray-700 leading-relaxed">{track.arranger}</p>
                                            </div>
                                        </div>
                                    )}
                                </div>
                            </motion.div>
                        )}

                        {/* 수록곡 */}
                        <motion.div
                            initial={{ opacity: 0, y: 20 }}
                            animate={{ opacity: 1, y: 0 }}
                            transition={{ delay: 0.3, duration: 0.4 }}
                            className="bg-white rounded-2xl p-6 border border-gray-100 shadow-sm"
                        >
                            <h2 className="text-lg font-bold mb-4 flex items-center gap-2">
                                <div className="w-1 h-5 bg-primary rounded-full"></div>
                                수록곡
                            </h2>
                            <div className="space-y-1">
                                {track.otherTracks?.map((t) => (
                                    <Link
                                        key={t.id}
                                        to={`/album/${encodeURIComponent(track.album?.title || albumName)}/track/${encodeURIComponent(t.title)}`}
                                        className={`flex items-center gap-3 p-3 rounded-xl transition-all ${
                                            t.title === track.title 
                                                ? 'bg-gradient-to-r from-primary/10 to-primary/5 text-primary shadow-sm' 
                                                : 'hover:bg-gray-50'
                                        }`}
                                    >
                                        <span className={`w-7 h-7 flex items-center justify-center text-xs rounded-lg ${
                                            t.title === track.title 
                                                ? 'bg-primary text-white font-bold' 
                                                : 'bg-gray-100 text-gray-500'
                                        }`}>
                                            {String(t.track_number).padStart(2, '0')}
                                        </span>
                                        <span className={`flex-1 text-sm truncate ${
                                            t.title === track.title ? 'font-semibold' : ''
                                        }`}>
                                            {t.title}
                                        </span>
                                        {t.is_title_track === 1 && (
                                            <span className="px-2 py-0.5 bg-primary text-white text-[10px] font-bold rounded-md">
                                                T
                                            </span>
                                        )}
                                    </Link>
                                ))}
                            </div>
                        </motion.div>
                    </div>

                    {/* 오른쪽: 가사 */}
                    <motion.div
                        initial={{ opacity: 0, y: 20 }}
                        animate={{ opacity: 1, y: 0 }}
                        transition={{ delay: 0.25, duration: 0.4 }}
                        className="col-span-2"
                    >
                        <div className="bg-white rounded-2xl p-8 border border-gray-100 shadow-sm min-h-[500px]">
                            <h2 className="text-lg font-bold mb-6 flex items-center gap-2">
                                <div className="w-1 h-5 bg-primary rounded-full"></div>
                                가사
                            </h2>
                            {track.lyrics ? (
                                <div className="text-gray-700 leading-[2] whitespace-pre-line text-[15px]">
                                    {track.lyrics}
                                </div>
                            ) : (
                                <div className="text-center py-20 text-gray-400">
                                    <Mic2 size={56} className="mx-auto mb-4 opacity-20" />
                                    <p className="text-lg">가사 정보가 없습니다</p>
                                </div>
                            )}
                        </div>
                    </motion.div>
                </div>
            </div>
        </motion.div>
    );
}

export default TrackDetail;
