/// 앨범 목록 화면
library;

import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:lucide_icons/lucide_icons.dart';
import '../../core/constants.dart';
import '../../models/album.dart';
import '../../services/albums_service.dart';

class AlbumView extends StatefulWidget {
  const AlbumView({super.key});

  @override
  State<AlbumView> createState() => _AlbumViewState();
}

class _AlbumViewState extends State<AlbumView> {
  late Future<List<Album>> _albumsFuture;
  bool _initialLoadComplete = false;

  @override
  void initState() {
    super.initState();
    _albumsFuture = getAlbums();
    // 초기 애니메이션 시간 후에는 새로 생성되는 카드에 애니메이션 적용 안함
    Future.delayed(const Duration(milliseconds: 600), () {
      if (mounted) {
        setState(() => _initialLoadComplete = true);
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<Album>>(
      future: _albumsFuture,
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Center(
            child: CircularProgressIndicator(
              color: AppColors.primary,
            ),
          );
        }

        if (snapshot.hasError) {
          return Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                const Icon(
                  LucideIcons.alertCircle,
                  size: 48,
                  color: AppColors.textTertiary,
                ),
                const SizedBox(height: 16),
                Text(
                  '앨범을 불러오는데 실패했습니다',
                  style: TextStyle(
                    fontSize: 14,
                    color: AppColors.textSecondary,
                  ),
                ),
                const SizedBox(height: 16),
                TextButton(
                  onPressed: () {
                    setState(() {
                      _albumsFuture = getAlbums();
                    });
                  },
                  child: const Text('다시 시도'),
                ),
              ],
            ),
          );
        }

        final albums = snapshot.data ?? [];

        return GridView.builder(
          padding: const EdgeInsets.all(16),
          clipBehavior: Clip.none,
          gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 2,
            crossAxisSpacing: 16,
            mainAxisSpacing: 16,
            childAspectRatio: 0.75,
          ),
          itemCount: albums.length,
          itemBuilder: (context, index) {
            final album = albums[index];
            return _AlbumCard(
              album: album,
              index: index,
              skipAnimation: _initialLoadComplete,
            );
          },
        );
      },
    );
  }
}

class _AlbumCard extends StatefulWidget {
  final Album album;
  final int index;
  final bool skipAnimation;

  const _AlbumCard({
    required this.album,
    required this.index,
    this.skipAnimation = false,
  });

  @override
  State<_AlbumCard> createState() => _AlbumCardState();
}

class _AlbumCardState extends State<_AlbumCard>
    with SingleTickerProviderStateMixin, AutomaticKeepAliveClientMixin {
  late AnimationController _controller;
  late Animation<double> _opacityAnimation;
  late Animation<Offset> _slideAnimation;
  bool _hasAnimated = false;

  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 400),
      vsync: this,
    );

    _opacityAnimation = Tween<double>(begin: 0.0, end: 1.0).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeOut),
    );

    _slideAnimation = Tween<Offset>(
      begin: const Offset(0, 0.1),
      end: Offset.zero,
    ).animate(
      CurvedAnimation(parent: _controller, curve: Curves.easeOut),
    );

    // skipAnimation이면 애니메이션 건너뛰고 바로 표시
    if (widget.skipAnimation) {
      _hasAnimated = true;
      _controller.value = 1.0;
    } else {
      // 순차적으로 애니메이션 시작 (최대 8개까지만 순차, 이후는 동시에)
      final delay = widget.index < 8 ? widget.index * 50 : 400;
      Future.delayed(Duration(milliseconds: delay), () {
        if (mounted && !_hasAnimated) {
          _hasAnimated = true;
          _controller.forward();
        }
      });
    }
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    return FadeTransition(
      opacity: _opacityAnimation,
      child: SlideTransition(
        position: _slideAnimation,
        child: GestureDetector(
          onTap: () {
            final folderName = widget.album.folderName;
            if (folderName != null && folderName.isNotEmpty) {
              context.push('/album/$folderName');
            }
          },
          child: Container(
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.circular(16),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withValues(alpha: 0.08),
                  blurRadius: 8,
                  offset: const Offset(0, 2),
                ),
              ],
            ),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // 앨범 커버
                Expanded(
                  child: ClipRRect(
                    borderRadius: const BorderRadius.vertical(
                      top: Radius.circular(16),
                    ),
                    child: Container(
                      width: double.infinity,
                      color: AppColors.divider,
                      child: widget.album.coverThumbUrl != null
                          ? CachedNetworkImage(
                              imageUrl: widget.album.coverThumbUrl!,
                              fit: BoxFit.cover,
                              placeholder: (context, url) => Container(
                                color: AppColors.divider,
                              ),
                              errorWidget: (context, url, error) => const Center(
                                child: Icon(
                                  LucideIcons.disc3,
                                  size: 48,
                                  color: AppColors.textTertiary,
                                ),
                              ),
                            )
                          : const Center(
                              child: Icon(
                                LucideIcons.disc3,
                                size: 48,
                                color: AppColors.textTertiary,
                              ),
                            ),
                    ),
                  ),
                ),
                // 앨범 정보
                Padding(
                  padding: const EdgeInsets.all(12),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        widget.album.title,
                        style: const TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.w600,
                          color: AppColors.textPrimary,
                        ),
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                      ),
                      const SizedBox(height: 4),
                      Text(
                        '${widget.album.albumTypeShort ?? ''} · ${widget.album.releaseYear ?? ''}',
                        style: const TextStyle(
                          fontSize: 12,
                          color: AppColors.textTertiary,
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}