import 'dart:io';
import 'dart:math' as math;
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:carousel_slider/carousel_slider.dart';
import 'package:lucide_icons/lucide_icons.dart';
import '../../providers/sakenowa_providers.dart';
import '../../providers/sake_list_provider.dart';
import '../../providers/theme_provider.dart';
import '../../models/sakenowa/sakenowa_models.dart';
import '../../services/mbti_compatibility_service.dart';
import '../../theme/app_colors.dart';

/// さけのわパーソナライズドランキングセクション
/// 
/// さけのわTOP100 × ユーザーデータの掛け合わせ
/// - 既飲銘柄ハイライト
/// - MBTI相性スコア表示
/// - 3Dカルーセル表示
class SakenowaRankingSection extends ConsumerStatefulWidget {
  final int displayCount;

  const SakenowaRankingSection({
    super.key,
    this.displayCount = 10,
  });

  @override
  ConsumerState<SakenowaRankingSection> createState() => _SakenowaRankingSectionState();
}

class _SakenowaRankingSectionState extends ConsumerState<SakenowaRankingSection> {
  int _currentIndex = 0;
  final CarouselSliderController _carouselController = CarouselSliderController();

  @override
  Widget build(BuildContext context) {
    final rankingsAsync = ref.watch(sakenowaRankingsProvider);
    final brandsAsync = ref.watch(sakenowaBrandsProvider);
    final flavorChartsAsync = ref.watch(sakenowaFlavorChartsProvider);
    final userItemsAsync = ref.watch(allSakeItemsProvider);
    final userProfile = ref.watch(userProfileProvider);
    final appColors = Theme.of(context).extension<AppColors>() ?? AppColors.washiLight();
    final theme = Theme.of(context);
    
    // 既飲銘柄名のセット（AsyncValueから取得）
    final drunkNames = userItemsAsync.maybeWhen(
      data: (items) => items.map((i) => i.displayData.displayName.toLowerCase()).toSet(),
      orElse: () => <String>{},
    );

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        // セクションヘッダー
        Padding(
          padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
          child: Row(
            children: [
              Icon(
                LucideIcons.trendingUp,
                size: 20,
                color: theme.colorScheme.primary,
              ),
              const SizedBox(width: 8),
              Expanded(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      'みんなの人気TOP${widget.displayCount}',
                      style: theme.textTheme.titleMedium?.copyWith(
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    Text(
                      'さけのわTOP100からランキング順で表示',
                      style: TextStyle(
                        fontSize: 11,
                        color: appColors.textSecondary,
                      ),
                    ),
                  ],
                ),
              ),
              // さけのわ帰属表示
              GestureDetector(
                onTap: () => _showAttribution(context),
                child: Container(
                  padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                  decoration: BoxDecoration(
                    color: appColors.surfaceSubtle,
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: Row(
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Icon(LucideIcons.info, size: 12, color: appColors.iconSubtle),
                      const SizedBox(width: 4),
                      Text(
                        'さけのわ',
                        style: TextStyle(
                          fontSize: 10,
                          color: appColors.textTertiary,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),

        // 3Dカルーセル
        rankingsAsync.when(
          data: (rankings) {
            return brandsAsync.when(
              data: (brands) {
                return flavorChartsAsync.when(
                  data: (flavorCharts) {
                    final brandMap = {for (var b in brands) b.id: b};
                    final chartMap = {for (var c in flavorCharts) c.brandId: c};

                    // 表示用データを作成
                    final displayItems = rankings.take(widget.displayCount).map((ranking) {
                      final brand = brandMap[ranking.brandId];
                      if (brand == null) return null;

                      final chart = chartMap[ranking.brandId];
                      final isDrunk = drunkNames.contains(brand.name.toLowerCase());

                      // ✅ 既飲の場合、ユーザーの撮影画像を取得
                      String? userImagePath;
                      if (isDrunk) {
                        final matchedSake = userItemsAsync.maybeWhen(
                          data: (items) {
                            try {
                              return items.firstWhere(
                                (i) => i.displayData.displayName.toLowerCase() == brand.name.toLowerCase(),
                              );
                            } catch (e) {
                              return null;
                            }
                          },
                          orElse: () => null,
                        );
                        if (matchedSake != null && matchedSake.displayData.imagePaths.isNotEmpty) {
                          userImagePath = matchedSake.displayData.imagePaths.first;
                        }
                      }

                      return _RankingDisplayItem(
                        rank: ranking.rank,
                        brand: brand,
                        flavorChart: chart,
                        isDrunk: isDrunk,
                        mbtiType: userProfile.mbti,
                        userImagePath: userImagePath, // ✅ 追加
                      );
                    }).whereType<_RankingDisplayItem>().toList();

                    if (displayItems.isEmpty) {
                      return _buildErrorState(context, appColors);
                    }

                    return _buildCarousel(context, displayItems, appColors);
                  },
                  loading: () => _buildLoadingState(appColors),
                  error: (err, stack) => _buildErrorState(context, appColors),
                );
              },
              loading: () => _buildLoadingState(appColors),
              error: (err, stack) => _buildErrorState(context, appColors),
            );
          },
          loading: () => _buildLoadingState(appColors),
          error: (err, stack) => _buildErrorState(context, appColors),
        ),
      ],
    );
  }

  Widget _buildCarousel(BuildContext context, List<_RankingDisplayItem> items, AppColors appColors) {
    return Column(
      children: [
        SizedBox(
          height: 280,
          child: CarouselSlider.builder(
            carouselController: _carouselController,
            itemCount: items.length,
            options: CarouselOptions(
              height: 280,
              enlargeCenterPage: true,
              enlargeFactor: 0.3,
              enlargeStrategy: CenterPageEnlargeStrategy.zoom,
              viewportFraction: 0.45,
              enableInfiniteScroll: items.length > 2,
              autoPlay: false,
              scrollPhysics: const BouncingScrollPhysics(),
              onPageChanged: (index, reason) {
                setState(() => _currentIndex = index);
              },
            ),
            itemBuilder: (context, index, realIndex) {
              final item = items[index];
              final distance = (_currentIndex - index).abs();
              final depth = distance == 0 ? 1.0 : math.max(0.65, 1.0 - (distance * 0.18));
              
              return _buildRankingCard(context, item, index == _currentIndex, depth, appColors);
            },
          ),
        ),
        const SizedBox(height: 12),
        // インジケーター
        _buildIndicator(items.length, appColors),
      ],
    );
  }

  Widget _buildIndicator(int count, AppColors appColors) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: List.generate(
        count,
        (index) {
          final isActive = _currentIndex == index;
          return GestureDetector(
            onTap: () => _carouselController.animateToPage(index),
            child: AnimatedContainer(
              duration: const Duration(milliseconds: 300),
              curve: Curves.easeOutCubic,
              width: isActive ? 20 : 8,
              height: 8,
              margin: const EdgeInsets.symmetric(horizontal: 3),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(4),
                color: isActive ? appColors.brandPrimary : appColors.divider,
                boxShadow: isActive
                    ? [BoxShadow(color: appColors.brandPrimary.withValues(alpha: 0.4), blurRadius: 4)]
                    : null,
              ),
            ),
          );
        },
      ),
    );
  }

  Widget _buildRankingCard(
    BuildContext context, 
    _RankingDisplayItem item, 
    bool isCurrent, 
    double depth,
    AppColors appColors,
  ) {
    // MBTI相性計算（簡易版 - フレーバーチャートベース）
    final mbtiScore = item.mbtiType != null && item.flavorChart != null
        ? _calculateMbtiFlavorMatch(item.mbtiType!, item.flavorChart!)
        : null;

    return GestureDetector(
      onTap: () => _showBrandDetail(context, item, mbtiScore, appColors),
      child: AnimatedContainer(
        duration: const Duration(milliseconds: 400),
        curve: Curves.easeOutCubic,
        margin: EdgeInsets.symmetric(
          vertical: isCurrent ? 0 : 14 * (1 - depth + 0.4),
          horizontal: 6,
        ),
        transform: Matrix4.diagonal3Values(depth, depth, 1.0)
          ..setEntry(3, 2, 0.001),
        transformAlignment: Alignment.center,
        child: Card(
          elevation: isCurrent ? 16 : 4 * depth,
          shadowColor: Colors.black.withValues(alpha: 0.3),
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(isCurrent ? 20 : 16),
          ),
          clipBehavior: Clip.antiAliasWithSaveLayer,
          child: Stack(
            fit: StackFit.expand,
            children: [
              // ✅ 既飲画像があればそれを使用、なければグラデーション
              if (item.userImagePath != null)
                Image.file(
                  File(item.userImagePath!),
                  fit: BoxFit.cover,
                )
              else
                Container(
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [
                        appColors.brandPrimary.withValues(alpha: 0.15),
                        appColors.surfaceSubtle,
                      ],
                    ),
                  ),
                ),

              // ✅ グラデーションオーバーレイ（画像の上に重ねてテキスト可読性確保）
              if (item.userImagePath != null)
                Container(
                  decoration: BoxDecoration(
                    gradient: LinearGradient(
                      begin: Alignment.topCenter,
                      end: Alignment.bottomCenter,
                      stops: const [0.0, 0.5, 1.0],
                      colors: [
                        Colors.black.withValues(alpha: 0.3),
                        Colors.black.withValues(alpha: 0.5),
                        Colors.black.withValues(alpha: 0.8),
                      ],
                    ),
                  ),
                ),

              // コンテンツ
              Padding(
                padding: const EdgeInsets.all(12),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    // ランキングバッジ
                    _buildRankBadge(item.rank, appColors),
                    const SizedBox(height: 8),
                    
                    // 銘柄名
                    Expanded(
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Text(
                            item.brand.name,
                            maxLines: 2,
                            overflow: TextOverflow.ellipsis,
                            textAlign: TextAlign.center,
                            style: TextStyle(
                              color: item.userImagePath != null ? Colors.white : appColors.textPrimary, // ✅ 画像ある場合は白文字
                              fontSize: isCurrent ? 14 : 12,
                              fontWeight: FontWeight.bold,
                              shadows: item.userImagePath != null
                                  ? [const Shadow(color: Colors.black, blurRadius: 6)] // ✅ 画像背景時は影付き
                                  : null,
                            ),
                          ),
                          if (item.flavorChart != null) ...[
                            const SizedBox(height: 4),
                            Text(
                              _getTopFlavors(item.flavorChart!),
                              style: TextStyle(
                                color: item.userImagePath != null ? Colors.white70 : appColors.textSecondary, // ✅ 画像ある場合は白文字
                                fontSize: 10,
                              ),
                            ),
                          ],
                        ],
                      ),
                    ),
                    
                    // MBTI相性（あれば）
                    if (mbtiScore != null) ...[
                      Container(
                        padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 3),
                        decoration: BoxDecoration(
                          color: _getMbtiColor(mbtiScore, appColors).withValues(alpha: 0.15),
                          borderRadius: BorderRadius.circular(8),
                        ),
                        child: Text(
                          '${_getMbtiStars(mbtiScore)} ${item.mbtiType}',
                          style: TextStyle(
                            color: _getMbtiColor(mbtiScore, appColors),
                            fontSize: 9,
                          ),
                        ),
                      ),
                    ],
                  ],
                ),
              ),

              // 既飲バッジ
              if (item.isDrunk)
                Positioned(
                  top: 8,
                  right: 8,
                  child: Container(
                    padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
                    decoration: BoxDecoration(
                      color: appColors.brandPrimary,
                      borderRadius: BorderRadius.circular(10),
                    ),
                    child: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        const Icon(Icons.check, color: Colors.white, size: 12),
                        const SizedBox(width: 2),
                        const Text(
                          '飲んだ',
                          style: TextStyle(
                            color: Colors.white,
                            fontSize: 10,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ],
                    ),
                  ),
                ),

              // 中央カードのグロー効果
              if (isCurrent)
                Positioned(
                  top: 0,
                  left: 0,
                  right: 0,
                  height: 3,
                  child: Container(
                    decoration: BoxDecoration(
                      gradient: LinearGradient(
                        colors: [
                          Colors.transparent,
                          appColors.brandPrimary.withValues(alpha: 0.8),
                          Colors.transparent,
                        ],
                      ),
                    ),
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildRankBadge(int rank, AppColors appColors) {
    Color badgeColor;
    switch (rank) {
      case 1:
        badgeColor = const Color(0xFFD4A574); // ゴールド
        break;
      case 2:
        badgeColor = const Color(0xFF9E9A94); // シルバー
        break;
      case 3:
        badgeColor = const Color(0xFFB8860B); // ブロンズ
        break;
      default:
        badgeColor = appColors.textSecondary;
    }

    return Container(
      width: 36,
      height: 36,
      decoration: BoxDecoration(
        color: badgeColor,
        shape: BoxShape.circle,
        boxShadow: [
          BoxShadow(
            color: badgeColor.withValues(alpha: 0.4),
            blurRadius: 8,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      alignment: Alignment.center,
      child: Text(
        '$rank',
        style: const TextStyle(
          color: Colors.white,
          fontWeight: FontWeight.bold,
          fontSize: 16,
        ),
      ),
    );
  }

  String _getTopFlavors(SakenowaFlavorChart chart) {
    final flavors = [
      ('華やか', chart.f1),
      ('芳醇', chart.f2),
      ('重厚', chart.f3),
      ('穏やか', chart.f4),
      ('軽快', chart.f5),
      ('ドライ', chart.f6),
    ];
    flavors.sort((a, b) => b.$2.compareTo(a.$2));
    return flavors.take(2).map((f) => f.$1).join('・');
  }

  // MBTI × フレーバーチャートのマッチ度（全6軸活用版）
  double _calculateMbtiFlavorMatch(String mbtiType, SakenowaFlavorChart chart) {
    // MBTICompatibilityServiceの五味好みを参照
    final flavorPrefs = MBTICompatibilityService.flavorPreferences[mbtiType];
    if (flavorPrefs == null) return 0.5;

    // ユーザーの五味好み（1-5スケール）を0-1に正規化
    final userAroma = ((flavorPrefs['aroma'] ?? 3) - 1) / 4;
    final userSweetness = ((flavorPrefs['sweetness'] ?? 3) - 1) / 4;
    final userAcidity = ((flavorPrefs['acidity'] ?? 3) - 1) / 4;
    final userBitterness = ((flavorPrefs['bitterness'] ?? 3) - 1) / 4;
    final userBody = ((flavorPrefs['body'] ?? 3) - 1) / 4;

    // さけのわフレーバー6軸との詳細マッピング
    // f1: 華やか → aroma
    // f2: 芳醇 → sweetness + aroma（芳醇は甘みと香りの複合）
    // f3: 重厚 → body
    // f4: 穏やか → sweetness（低acidity/bitterness）
    // f5: 軽快 → acidity（低body）
    // f6: ドライ → bitterness（低sweetness）

    double diff = 0;
    diff += (userAroma - chart.f1).abs();                      // 華やか → 香り
    diff += (userSweetness - (chart.f2 + chart.f4) / 2).abs(); // 芳醇・穏やか → 甘み
    diff += (userBody - chart.f3).abs();                       // 重厚 → コク
    diff += (userAcidity - chart.f5).abs();                    // 軽快 → 酸味
    diff += (userBitterness - chart.f6).abs();                 // ドライ → キレ

    // 5軸の差分合計を0-1スコアに変換
    return (1.0 - (diff / 5.0)).clamp(0.3, 1.0);
  }

  String _getMbtiStars(double score) {
    final starCount = (score * 5).round().clamp(1, 5);
    return '★' * starCount + '☆' * (5 - starCount);
  }

  Color _getMbtiColor(double score, AppColors appColors) {
    if (score >= 0.75) return appColors.brandPrimary;
    if (score >= 0.55) return appColors.textSecondary;
    return appColors.textTertiary;
  }

  Widget _buildLoadingState(AppColors appColors) {
    return SizedBox(
      height: 280,
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            CircularProgressIndicator(color: appColors.brandPrimary),
            const SizedBox(height: 12),
            Text(
              'ランキングを取得中...',
              style: TextStyle(color: appColors.textSecondary, fontSize: 12),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildErrorState(BuildContext context, AppColors appColors) {
    return SizedBox(
      height: 200,
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(LucideIcons.wifiOff, color: appColors.iconSubtle, size: 32),
            const SizedBox(height: 8),
            Text(
              'ランキングを取得できませんでした',
              style: TextStyle(color: appColors.textSecondary, fontSize: 12),
            ),
          ],
        ),
      ),
    );
  }

  void _showAttribution(BuildContext context) {
    final appColors = Theme.of(context).extension<AppColors>() ?? AppColors.washiLight();
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        backgroundColor: appColors.surfaceSubtle,
        title: Row(
          children: [
            Icon(LucideIcons.externalLink, color: appColors.brandPrimary, size: 20),
            const SizedBox(width: 8),
            const Text('さけのわデータ'),
          ],
        ),
        content: const Text(
          'このランキングは「さけのわ」のデータを利用しています。\n\n'
          'https://sakenowa.com\n\n'
          '※ユーザーの投稿に基づくデータです。',
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text('閉じる', style: TextStyle(color: appColors.brandPrimary)),
          ),
        ],
      ),
    );
  }

  void _showBrandDetail(
    BuildContext context, 
    _RankingDisplayItem item, 
    double? mbtiScore,
    AppColors appColors,
  ) {
    showModalBottomSheet(
      context: context,
      backgroundColor: appColors.surfaceSubtle,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
      ),
      builder: (context) => Padding(
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            // ヘッダー
            Row(
              children: [
                _buildRankBadge(item.rank, appColors),
                const SizedBox(width: 12),
                Expanded(
                  child: Text(
                    item.brand.name,
                    style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                if (item.isDrunk)
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
                    decoration: BoxDecoration(
                      color: appColors.brandPrimary,
                      borderRadius: BorderRadius.circular(16),
                    ),
                    child: const Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Icon(Icons.check, color: Colors.white, size: 14),
                        SizedBox(width: 4),
                        Text(
                          '飲んだ',
                          style: TextStyle(
                            color: Colors.white,
                            fontSize: 12,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                      ],
                    ),
                  ),
              ],
            ),
            const SizedBox(height: 20),
            
            // MBTI相性
            if (mbtiScore != null && item.mbtiType != null) ...[
              Container(
                padding: const EdgeInsets.all(16),
                decoration: BoxDecoration(
                  color: _getMbtiColor(mbtiScore, appColors).withValues(alpha: 0.1),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Row(
                  children: [
                    Icon(LucideIcons.brainCircuit, color: appColors.brandPrimary),
                    const SizedBox(width: 12),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            '${item.mbtiType}との相性',
                            style: TextStyle(
                              color: appColors.textSecondary,
                              fontSize: 12,
                            ),
                          ),
                          const SizedBox(height: 4),
                          Text(
                            _getMbtiStars(mbtiScore),
                            style: TextStyle(
                              color: _getMbtiColor(mbtiScore, appColors),
                              fontSize: 20,
                              letterSpacing: 2,
                            ),
                          ),
                        ],
                      ),
                    ),
                    Text(
                      '${(mbtiScore * 100).round()}%',
                      style: TextStyle(
                        color: _getMbtiColor(mbtiScore, appColors),
                        fontSize: 24,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 16),
            ],
            
            // フレーバーチャート
            if (item.flavorChart != null) ...[
              Text(
                'フレーバー特徴',
                style: TextStyle(
                  fontWeight: FontWeight.bold,
                  color: appColors.textPrimary,
                ),
              ),
              const SizedBox(height: 12),
              _buildFlavorBars(item.flavorChart!, appColors),
            ],
            const SizedBox(height: 16),
            
            // 帰属表示
            Text(
              'データ提供: さけのわ',
              style: TextStyle(
                fontSize: 11,
                color: appColors.textTertiary,
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildFlavorBars(SakenowaFlavorChart chart, AppColors appColors) {
    final flavors = [
      ('華やか', chart.f1),
      ('芳醇', chart.f2),
      ('重厚', chart.f3),
      ('穏やか', chart.f4),
      ('軽快', chart.f5),
      ('ドライ', chart.f6),
    ];

    return Column(
      children: flavors.map((f) => Padding(
        padding: const EdgeInsets.symmetric(vertical: 4),
        child: Row(
          children: [
            SizedBox(
              width: 50,
              child: Text(f.$1, style: TextStyle(fontSize: 12, color: appColors.textSecondary)),
            ),
            Expanded(
              child: ClipRRect(
                borderRadius: BorderRadius.circular(4),
                child: LinearProgressIndicator(
                  value: f.$2,
                  backgroundColor: appColors.divider,
                  color: appColors.brandPrimary,
                  minHeight: 8,
                ),
              ),
            ),
            const SizedBox(width: 8),
            Text(
              '${(f.$2 * 100).toInt()}%',
              style: TextStyle(fontSize: 11, color: appColors.textSecondary),
            ),
          ],
        ),
      )).toList(),
    );
  }
}

/// 表示用データクラス
class _RankingDisplayItem {
  final int rank;
  final SakenowaBrand brand;
  final SakenowaFlavorChart? flavorChart;
  final bool isDrunk;
  final String? mbtiType;
  final String? userImagePath; // ✅ 追加: ユーザーの撮影画像

  _RankingDisplayItem({
    required this.rank,
    required this.brand,
    this.flavorChart,
    required this.isDrunk,
    this.mbtiType,
    this.userImagePath, // ✅ 追加
  });
}