import { motion, AnimatePresence } from 'framer-motion';
import { useState, useEffect, useCallback } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { ArrowLeft, Play, Calendar, Music2, Clock, X, ChevronLeft, ChevronRight, Download } from 'lucide-react';
import { getAlbumByName } from '../../../api/public/albums';
import { formatDate } from '../../../utils/date';

// 모바일 앨범 상세 페이지
function MobileAlbumDetail() {
    const { name } = useParams();
    const navigate = useNavigate();
    const [album, setAlbum] = useState(null);
    const [loading, setLoading] = useState(true);
    const [lightbox, setLightbox] = useState({ open: false, images: [], index: 0 });
    const [imageLoaded, setImageLoaded] = useState(false);

    // 라이트박스 네비게이션
    const goToPrev = useCallback(() => {
        if (lightbox.images.length <= 1) return;
        setImageLoaded(false);
        setLightbox(prev => ({
            ...prev,
            index: (prev.index - 1 + prev.images.length) % prev.images.length
        }));
    }, [lightbox.images.length]);

    const goToNext = useCallback(() => {
        if (lightbox.images.length <= 1) return;
        setImageLoaded(false);
        setLightbox(prev => ({
            ...prev,
            index: (prev.index + 1) % prev.images.length
        }));
    }, [lightbox.images.length]);

    const closeLightbox = useCallback(() => {
        setLightbox(prev => ({ ...prev, open: false }));
    }, []);

    // 이미지 다운로드
    const downloadImage = useCallback(async () => {
        const imageUrl = lightbox.images[lightbox.index];
        if (!imageUrl) return;
        
        try {
            const response = await fetch(imageUrl);
            const blob = await response.blob();
            const url = window.URL.createObjectURL(blob);
            const link = document.createElement('a');
            link.href = url;
            link.download = `fromis9_photo_${String(lightbox.index + 1).padStart(2, '0')}.webp`;
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
            window.URL.revokeObjectURL(url);
        } catch (error) {
            console.error('다운로드 오류:', error);
        }
    }, [lightbox.images, lightbox.index]);

    // 라이트박스 body 스크롤 방지
    useEffect(() => {
        if (lightbox.open) {
            document.body.style.overflow = 'hidden';
        } else {
            document.body.style.overflow = '';
        }
        return () => { document.body.style.overflow = ''; };
    }, [lightbox.open]);

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

    // 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')}`;
    };

    if (loading) {
        return (
            <div className="flex items-center justify-center h-64">
                <div className="w-8 h-8 border-2 border-primary border-t-transparent rounded-full animate-spin" />
            </div>
        );
    }

    if (!album) {
        return (
            <div className="text-center py-12">
                <p className="text-gray-500">앨범을 찾을 수 없습니다</p>
            </div>
        );
    }

    // 모든 컨셉 포토를 하나의 배열로
    const allPhotos = album.conceptPhotos ? Object.values(album.conceptPhotos).flat() : [];

    return (
        <>
            <div className="pb-6">
                {/* 헤더 */}
                <div className="sticky top-14 z-40 bg-white/95 backdrop-blur-sm px-4 py-3 flex items-center gap-3 border-b border-gray-100">
                    <button onClick={() => navigate(-1)} className="p-1 -ml-1">
                        <ArrowLeft size={22} />
                    </button>
                    <span className="font-semibold truncate">{album.title}</span>
                </div>

                {/* 앨범 정보 섹션 */}
                <div className="px-4 pt-5 pb-4">
                    <div className="flex gap-4">
                        {/* 앨범 커버 */}
                        <motion.div 
                            initial={{ opacity: 0, scale: 0.9 }}
                            animate={{ opacity: 1, scale: 1 }}
                            className="w-32 h-32 flex-shrink-0 rounded-2xl overflow-hidden shadow-lg"
                            onClick={() => setLightbox({ 
                                open: true, 
                                images: [album.cover_original_url || album.cover_medium_url], 
                                index: 0 
                            })}
                        >
                            {album.cover_medium_url && (
                                <img 
                                    src={album.cover_medium_url} 
                                    alt={album.title}
                                    className="w-full h-full object-cover"
                                />
                            )}
                        </motion.div>

                        {/* 앨범 정보 */}
                        <motion.div 
                            initial={{ opacity: 0, x: 10 }}
                            animate={{ opacity: 1, x: 0 }}
                            className="flex-1 min-w-0"
                        >
                            <span className="inline-block px-2.5 py-1 bg-primary/10 text-primary text-xs font-medium rounded-full mb-2">
                                {album.album_type}
                            </span>
                            <h1 className="text-xl font-bold mb-2 truncate">{album.title}</h1>
                            
                            {/* 메타 정보 */}
                            <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-xs text-gray-500">
                                <div className="flex items-center gap-1">
                                    <Calendar size={12} />
                                    <span>{formatDate(album.release_date, 'YYYY.MM.DD')}</span>
                                </div>
                                <div className="flex items-center gap-1">
                                    <Music2 size={12} />
                                    <span>{album.tracks?.length || 0}곡</span>
                                </div>
                                <div className="flex items-center gap-1">
                                    <Clock size={12} />
                                    <span>{getTotalDuration()}</span>
                                </div>
                            </div>
                        </motion.div>
                    </div>
                </div>

                {/* 티저 포토 */}
                {album.teasers && album.teasers.length > 0 && (
                    <motion.div 
                        initial={{ opacity: 0 }}
                        animate={{ opacity: 1 }}
                        className="px-4 mb-5"
                    >
                        <p className="text-xs text-gray-400 mb-2">티저 포토</p>
                        <div className="flex gap-2 overflow-x-auto pb-1 -mx-4 px-4">
                            {album.teasers.map((teaser, index) => (
                                <div 
                                    key={index}
                                    onClick={() => setLightbox({ 
                                        open: true, 
                                        images: album.teasers.map(t => t.original_url), 
                                        index,
                                        teasers: album.teasers
                                    })}
                                    className="w-20 h-20 flex-shrink-0 bg-gray-200 rounded-xl overflow-hidden relative"
                                >
                                    {teaser.media_type === 'video' ? (
                                        <>
                                            <video 
                                                src={teaser.original_url}
                                                className="w-full h-full object-cover"
                                                muted
                                            />
                                            <div className="absolute inset-0 flex items-center justify-center bg-black/30">
                                                <div className="w-7 h-7 bg-white/90 rounded-full flex items-center justify-center">
                                                    <Play size={12} fill="currentColor" className="ml-0.5 text-gray-800" />
                                                </div>
                                            </div>
                                        </>
                                    ) : (
                                        <img 
                                            src={teaser.thumb_url || teaser.original_url}
                                            alt={`Teaser ${index + 1}`}
                                            className="w-full h-full object-cover"
                                        />
                                    )}
                                </div>
                            ))}
                        </div>
                    </motion.div>
                )}

                {/* 수록곡 */}
                {album.tracks && album.tracks.length > 0 && (
                    <motion.div 
                        initial={{ opacity: 0, y: 20 }}
                        animate={{ opacity: 1, y: 0 }}
                        className="px-4 mb-5"
                    >
                        <h2 className="text-base font-bold mb-3">수록곡</h2>
                        <div className="bg-white rounded-2xl shadow-sm overflow-hidden">
                            {album.tracks.map((track, index) => (
                                <div
                                    key={track.id}
                                    className={`flex items-center gap-3 px-4 py-3 ${
                                        index !== album.tracks.length - 1 ? 'border-b border-gray-100' : ''
                                    }`}
                                >
                                    <div className="w-8 h-8 flex items-center justify-center rounded-full bg-gray-100">
                                        <span className="text-xs text-gray-500">
                                            {String(track.track_number).padStart(2, '0')}
                                        </span>
                                    </div>
                                    <div className="flex-1 min-w-0">
                                        <div className="flex items-center gap-2">
                                            <p className={`text-sm font-medium truncate ${track.is_title_track ? 'text-primary' : ''}`}>
                                                {track.title}
                                            </p>
                                            {track.is_title_track === 1 && (
                                                <span className="px-1.5 py-0.5 bg-primary text-white text-[10px] font-medium rounded">
                                                    TITLE
                                                </span>
                                            )}
                                        </div>
                                    </div>
                                    <span className="text-xs text-gray-400 tabular-nums">
                                        {track.duration || '-'}
                                    </span>
                                    {track.music_video_url && (
                                        <a 
                                            href={track.music_video_url}
                                            target="_blank"
                                            rel="noopener noreferrer"
                                            className="p-1.5 text-red-500"
                                        >
                                            <Play size={16} fill="currentColor" />
                                        </a>
                                    )}
                                </div>
                            ))}
                        </div>
                    </motion.div>
                )}

                {/* 컨셉 포토 */}
                {allPhotos.length > 0 && (
                    <motion.div 
                        initial={{ opacity: 0, y: 20 }}
                        animate={{ opacity: 1, y: 0 }}
                        transition={{ delay: 0.1 }}
                        className="px-4"
                    >
                        <div className="flex items-center justify-between mb-3">
                            <h2 className="text-base font-bold">컨셉 포토</h2>
                            <button 
                                onClick={() => navigate(`/album/${name}/gallery`)}
                                className="text-xs text-primary"
                            >
                                전체보기 ({allPhotos.length}장)
                            </button>
                        </div>
                        <div className="grid grid-cols-3 gap-2">
                            {allPhotos.slice(0, 6).map((photo, idx) => (
                                <div 
                                    key={photo.id}
                                    onClick={() => setLightbox({ 
                                        open: true, 
                                        images: allPhotos.map(p => p.original_url), 
                                        index: idx 
                                    })}
                                    className="aspect-square bg-gray-200 rounded-xl overflow-hidden"
                                >
                                    <img 
                                        src={photo.thumb_url || photo.medium_url} 
                                        alt={`컨셉 포토 ${idx + 1}`}
                                        loading="lazy"
                                        className="w-full h-full object-cover"
                                    />
                                </div>
                            ))}
                        </div>
                    </motion.div>
                )}

                {/* 설명 */}
                {album.description && (
                    <motion.div 
                        initial={{ opacity: 0 }}
                        animate={{ opacity: 1 }}
                        className="px-4 mt-5"
                    >
                        <h2 className="text-base font-bold mb-3">소개</h2>
                        <p className="text-sm text-gray-600 leading-relaxed bg-white p-4 rounded-2xl shadow-sm">
                            {album.description}
                        </p>
                    </motion.div>
                )}
            </div>

            {/* 라이트박스 */}
            <AnimatePresence>
                {lightbox.open && (
                    <motion.div 
                        initial={{ opacity: 0 }}
                        animate={{ opacity: 1 }}
                        exit={{ opacity: 0 }}
                        className="fixed inset-0 bg-black z-50 flex items-center justify-center"
                        onClick={closeLightbox}
                    >
                        {/* 상단 버튼 */}
                        <div className="absolute top-4 right-4 flex gap-3 z-10">
                            <button 
                                className="text-white/70 p-2"
                                onClick={(e) => {
                                    e.stopPropagation();
                                    downloadImage();
                                }}
                            >
                                <Download size={22} />
                            </button>
                            <button 
                                className="text-white/70 p-2"
                                onClick={closeLightbox}
                            >
                                <X size={24} />
                            </button>
                        </div>

                        {/* 이전 버튼 */}
                        {lightbox.images.length > 1 && (
                            <button 
                                className="absolute left-2 p-2 text-white/70 z-10"
                                onClick={(e) => {
                                    e.stopPropagation();
                                    goToPrev();
                                }}
                            >
                                <ChevronLeft size={32} />
                            </button>
                        )}

                        {/* 로딩 스피너 */}
                        {!imageLoaded && (
                            <div className="absolute inset-0 flex items-center justify-center">
                                <div className="w-8 h-8 border-2 border-white border-t-transparent rounded-full animate-spin" />
                            </div>
                        )}

                        {/* 이미지/비디오 */}
                        {lightbox.teasers?.[lightbox.index]?.media_type === 'video' ? (
                            <video
                                src={lightbox.images[lightbox.index]}
                                className={`max-w-full max-h-full object-contain transition-opacity ${imageLoaded ? 'opacity-100' : 'opacity-0'}`}
                                onClick={(e) => e.stopPropagation()}
                                onCanPlay={() => setImageLoaded(true)}
                                controls
                                autoPlay
                            />
                        ) : (
                            <img 
                                src={lightbox.images[lightbox.index]}
                                alt="확대 이미지"
                                className={`max-w-full max-h-full object-contain transition-opacity ${imageLoaded ? 'opacity-100' : 'opacity-0'}`}
                                onClick={(e) => e.stopPropagation()}
                                onLoad={() => setImageLoaded(true)}
                            />
                        )}

                        {/* 다음 버튼 */}
                        {lightbox.images.length > 1 && (
                            <button 
                                className="absolute right-2 p-2 text-white/70 z-10"
                                onClick={(e) => {
                                    e.stopPropagation();
                                    goToNext();
                                }}
                            >
                                <ChevronRight size={32} />
                            </button>
                        )}

                        {/* 인디케이터 */}
                        {lightbox.images.length > 1 && (
                            <div className="absolute bottom-6 left-0 right-0 flex justify-center gap-1.5">
                                {lightbox.images.map((_, i) => (
                                    <div 
                                        key={i}
                                        className={`w-1.5 h-1.5 rounded-full transition-colors ${
                                            i === lightbox.index ? 'bg-white' : 'bg-white/40'
                                        }`}
                                    />
                                ))}
                            </div>
                        )}
                    </motion.div>
                )}
            </AnimatePresence>
        </>
    );
}

export default MobileAlbumDetail;