ponshu-room-lite/lib/screens/camera_analysis_mixin.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:uuid/uuid.dart';
import 'package:lucide_icons/lucide_icons.dart';

import '../models/sake_item.dart';
import '../providers/gemini_provider.dart';
import '../providers/sakenowa_providers.dart';
import '../providers/theme_provider.dart';
import '../services/api_usage_service.dart';
import '../services/draft_service.dart';
import '../services/gamification_service.dart';
import '../services/gemini_exceptions.dart';
import '../services/network_service.dart';
import '../theme/app_colors.dart';
import '../widgets/analyzing_dialog.dart';

/// カメラ解析ロジックを CameraScreen の State から切り出した Mixin。
///
/// 責務:
///   - capturedImages / quotaLockoutTime の保持（先頭 _ は不可: 別ライブラリの State から参照できない）
///   - analyzeImages()  : オンライン/オフライン分岐・Gemini呼び出し・Hive保存・Gamification
///   - _performSakenowaMatching() : バックグラウンドさけのわ自動マッチング
mixin CameraAnalysisMixin<T extends ConsumerStatefulWidget> on ConsumerState<T> {
  final List<String> capturedImages = [];
  DateTime? quotaLockoutTime;

  Future<void> analyzeImages() async {
    if (capturedImages.isEmpty) return;

    // async gap 前に context 依存オブジェクトをキャプチャ
    final messenger = ScaffoldMessenger.of(context);
    final navigator = Navigator.of(context);

    final isOnline = await NetworkService.isOnline();
    if (!isOnline) {
      // オフライン時: Draft として保存
      debugPrint('Offline detected: Saving as draft...');

      try {
        await DraftService.saveDraft(capturedImages, reason: DraftReason.offline);

        if (!mounted) return;

        messenger.showSnackBar(
          const SnackBar(
            content: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Icon(LucideIcons.wifiOff, color: Colors.orange, size: 16),
                    SizedBox(width: 8),
                    Text('オフライン検知', style: TextStyle(fontWeight: FontWeight.bold)),
                  ],
                ),
                SizedBox(height: 4),
                Text('写真を「解析待ち」として保存しました。'),
                Text('オンライン復帰後、ホーム画面から解析できます。'),
              ],
            ),
            duration: Duration(seconds: 5),
            backgroundColor: Colors.orange,
          ),
        );

        navigator.pop();
        return;
      } catch (e) {
        debugPrint('Draft save error: $e');
        if (!mounted) return;
        messenger.showSnackBar(
          SnackBar(content: Text('Draft保存エラー: $e')),
        );
        return;
      }
    }

    // クォータ事前チェック（日次上限 20回/日、UTC 08:00 リセット）
    final isQuotaExhausted = await ApiUsageService.isExhausted();
    if (isQuotaExhausted) {
      debugPrint('Quota exhausted: Saving as draft...');
      try {
        await DraftService.saveDraft(capturedImages, reason: DraftReason.quotaLimit);
        if (!mounted) return;
        final resetTime = ApiUsageService.getNextResetTime();
        final resetStr  = '${resetTime.hour}:${resetTime.minute.toString().padLeft(2, '0')}';
        messenger.showSnackBar(
          SnackBar(
            content: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Row(
                  children: [
                    Icon(LucideIcons.zap, color: Colors.orange, size: 16),
                    SizedBox(width: 8),
                    Text('本日のAI解析上限（20回）に達しました',
                        style: TextStyle(fontWeight: FontWeight.bold)),
                  ],
                ),
                const SizedBox(height: 4),
                const Text('写真を「解析待ち」として保存しました。'),
                Text('$resetStr 以降にホーム画面から解析できます。'),
              ],
            ),
            duration: const Duration(seconds: 6),
            backgroundColor: Colors.orange,
          ),
        );
        navigator.pop(); // カメラ画面を閉じてホームへ
      } catch (e) {
        debugPrint('Draft save error (quota): $e');
        if (!mounted) return;
        messenger.showSnackBar(
          SnackBar(content: Text('保存エラー: $e')),
        );
      }
      return;
    }

    // オンライン時: 通常の解析フロー
    if (!mounted) return;
    // ignore: use_build_context_synchronously
    // 直前の mounted チェックにより BuildContext の有効性は保証されている
    showDialog(
      context: context,
      barrierDismissible: false,
      builder: (context) => const AnalyzingDialog(),
    );

    try {
      debugPrint('Starting Gemini Vision Direct Analysis for ${capturedImages.length} images');
      final geminiService = ref.read(geminiServiceProvider);
      final result = await geminiService.analyzeSakeLabel(capturedImages);

      // Create SakeItem (Schema v2.0)
      final sakeItem = SakeItem(
        id: const Uuid().v4(),
        displayData: DisplayData(
          name: result.name ?? '不明な日本酒',
          brewery: result.brand ?? '不明',
          prefecture: result.prefecture ?? '不明',
          catchCopy: result.catchCopy,
          imagePaths: List.from(capturedImages),
          rating: null,
        ),
        hiddenSpecs: HiddenSpecs(
          description: result.description,
          tasteStats: result.tasteStats,
          flavorTags: result.flavorTags,
          type: result.type,
          alcoholContent: result.alcoholContent,
          polishingRatio: result.polishingRatio,
          sakeMeterValue: result.sakeMeterValue,
          riceVariety: result.riceVariety,
          yeast: result.yeast,
          manufacturingYearMonth: result.manufacturingYearMonth,
        ),
        metadata: Metadata(
          createdAt: DateTime.now(),
          aiConfidence: result.confidenceScore,
        ),
      );

      // Save to Hive
      final box = Hive.box<SakeItem>('sake_items');
      await box.add(sakeItem);

      // API 使用回数をカウントアップ（キャッシュヒット時は実際の API 呼び出しなし）
      if (!result.isFromCache) {
        await ApiUsageService.increment();
        ref.invalidate(apiUsageCountProvider);
      }

      // さけのわ自動マッチング（非同期・バックグラウンド）
      // エラーが発生しても登録フローを中断しない
      _performSakenowaMatching(sakeItem).catchError((error) {
        debugPrint('Sakenowa auto-matching failed (non-critical): $error');
      });

      // Prepend new item to sort order so it appears at the top
      final settingsBox = Hive.box('settings');
      final List<String> currentOrder = (settingsBox.get('sake_sort_order') as List<dynamic>?)
          ?.cast<String>() ?? [];
      currentOrder.insert(0, sakeItem.id);
      await settingsBox.put('sake_sort_order', currentOrder);

      // --- Gamification Hook ---
      // キャッシュヒット結果にはEXP付与しない（同一画像の重複スキャン対策）
      int expGained = 0;
      int newLevel = 0;
      bool isLevelUp = false;
      List<dynamic> newBadges = [];

      if (!result.isFromCache) {
        final userProfileState = ref.read(userProfileProvider);
        final prevLevel = userProfileState.level;
        expGained = 10;

        await ref.read(userProfileProvider.notifier).updateTotalExp(userProfileState.totalExp + expGained);
        newBadges = await GamificationService.checkAndUnlockBadges(ref);

        final updatedProfile = ref.read(userProfileProvider);
        newLevel = updatedProfile.level;
        isLevelUp = newLevel > prevLevel;

        debugPrint('Gamification: EXP +$expGained (Total: ${updatedProfile.totalExp}) Level: $prevLevel -> $newLevel');
      } else {
        debugPrint('Cache hit: EXP not awarded (same image re-scanned)');
      }

      debugPrint('Saved to Hive: ${sakeItem.displayData.displayName} (ID: ${sakeItem.id})');
      debugPrint('Total items in box: ${box.length}');

      // 解析完了後に画像リストをクリア（次の撮影セッション用）
      setState(() => capturedImages.clear());

      if (!mounted) return;

      navigator.pop(); // Close AnalyzingDialog
      navigator.pop(); // Close Camera Screen (Return to Home)

      // Success Message
      final isDark = Theme.of(context).brightness == Brightness.dark;
      final List<Widget> messageWidgets = [
        Text('${sakeItem.displayData.displayName} を登録しました！'),
      ];

      if (result.isFromCache) {
        messageWidgets.add(const SizedBox(height: 4));
        messageWidgets.add(const Text(
          '※ 解析済みの結果を使用（経験値なし）',
          style: TextStyle(fontSize: 12, color: Colors.grey),
        ));
      } else {
        messageWidgets.add(const SizedBox(height: 4));
        messageWidgets.add(Row(
          children: [
            Icon(LucideIcons.sparkles,
                 color: isDark ? Colors.yellow.shade300 : Colors.yellow,
                 size: 16),
            const SizedBox(width: 8),
            Text(
              '経験値 +$expGained GET!${isLevelUp ? " (Level UP!)" : ""}',
              style: TextStyle(
                fontWeight: FontWeight.bold,
                color: isDark ? Colors.yellow.shade200 : Colors.yellowAccent,
              ),
            ),
          ],
        ));
      }

      if (newBadges.isNotEmpty) {
        messageWidgets.add(const SizedBox(height: 8));
        for (var badge in newBadges) {
          messageWidgets.add(
            Row(
              children: [
                Text(badge.icon, style: const TextStyle(fontSize: 16)),
                const SizedBox(width: 8),
                Text(
                  'バッジ獲得: ${badge.name}',
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    color: isDark ? Colors.green.shade300 : Colors.greenAccent,
                  ),
                ),
              ],
            ),
          );
        }
      }

      messenger.showSnackBar(
        SnackBar(
          content: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.start,
            children: messageWidgets,
          ),
          duration: Duration(seconds: newBadges.isNotEmpty ? 6 : 4),
        ),
      );

    } catch (e) {
      if (mounted) {
        navigator.pop(); // Close AnalyzingDialog

        // AIサーバー混雑（503）→ ドラフト保存してオフライン時と同じ扱いに
        if (e is GeminiCongestionException) {
          try {
            await DraftService.saveDraft(capturedImages, reason: DraftReason.congestion);
            if (!mounted) return;
            navigator.pop(); // Close camera screen
            messenger.showSnackBar(
              const SnackBar(
                content: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Row(
                      children: [
                        Icon(LucideIcons.cloudOff, color: Colors.white, size: 16),
                        SizedBox(width: 8),
                        Text('AIサーバー混雑', style: TextStyle(fontWeight: FontWeight.bold)),
                      ],
                    ),
                    SizedBox(height: 4),
                    Text('写真を「解析待ち」として保存しました。'),
                    Text('時間をおいてホーム画面から解析できます。'),
                  ],
                ),
                duration: Duration(seconds: 5),
                backgroundColor: Colors.orange,
              ),
            );
          } catch (draftError) {
            debugPrint('Draft save also failed: $draftError');
            if (!mounted) return;
            messenger.showSnackBar(
              const SnackBar(content: Text('解析もドラフト保存も失敗しました。再試行してください。')),
            );
          }
          return;
        }

        // Quota エラー（429）→ ドラフト保存してカメラを閉じる
        final errStr = e.toString();
        if (errStr.contains('Quota') || errStr.contains('429')) {
          try {
            await DraftService.saveDraft(capturedImages, reason: DraftReason.quotaLimit);
            if (!mounted) return;
            navigator.pop(); // カメラ画面を閉じる
            final resetTime = ApiUsageService.getNextResetTime();
            final resetStr  = '${resetTime.hour}:${resetTime.minute.toString().padLeft(2, '0')}';
            messenger.showSnackBar(
              SnackBar(
                content: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Row(
                      children: [
                        Icon(LucideIcons.zap, color: Colors.orange, size: 16),
                        SizedBox(width: 8),
                        Text('本日のAI解析上限（20回）に達しました',
                            style: TextStyle(fontWeight: FontWeight.bold)),
                      ],
                    ),
                    const SizedBox(height: 4),
                    const Text('写真を「解析待ち」として保存しました。'),
                    Text('$resetStr 以降にホーム画面から解析できます。'),
                  ],
                ),
                duration: const Duration(seconds: 6),
                backgroundColor: Colors.orange,
              ),
            );
          } catch (draftError) {
            debugPrint('Draft save failed after 429: $draftError');
            if (!mounted) return;
            messenger.showSnackBar(
              const SnackBar(content: Text('解析もドラフト保存も失敗しました。再試行してください。')),
            );
          }
          return;
        }

        final appColors = Theme.of(context).extension<AppColors>()!;
        messenger.showSnackBar(
          SnackBar(
            content: Text('解析エラー: $e'),
            duration: const Duration(seconds: 5),
            backgroundColor: appColors.error,
          ),
        );
      }
    }
  }

  /// さけのわ自動マッチング処理
  ///
  /// 登録後にバックグラウンドで実行。
  /// エラーが発生しても登録フローを中断しない。
  Future<void> _performSakenowaMatching(SakeItem sakeItem) async {
    try {
      debugPrint('Starting sakenowa auto-matching for: ${sakeItem.displayData.displayName}');

      final matchingService = ref.read(sakenowaAutoMatchingServiceProvider);

      final result = await matchingService.matchSake(
        sakeItem: sakeItem,
        minScore: 0.7,
        autoApply: true,
      );

      if (result.hasMatch) {
        debugPrint('Sakenowa matching successful: ${result.brand?.name} / score=${result.score.toStringAsFixed(2)} confident=${result.isConfident}');
      } else {
        debugPrint('No sakenowa match found (score: ${result.score.toStringAsFixed(2)})');
      }
    } catch (e, stackTrace) {
      debugPrint('Sakenowa auto-matching error: $e');
      debugPrint('Stack trace: $stackTrace');
    }
  }
}