255 lines
7.4 KiB
Dart
255 lines
7.4 KiB
Dart
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import '../models/sake_item.dart';
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import '../models/sakenowa/sakenowa_models.dart';
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import 'sakenowa_service.dart';
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/// さけのわAPIを使用した外部レコメンデーションサービス
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///
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/// ユーザーがまだ飲んだことがない日本酒を、
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/// 五味チャートの好みに基づいておすすめする
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class SakenowaRecommendationService {
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final SakenowaService _sakenowaService;
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SakenowaRecommendationService(this._sakenowaService);
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/// ユーザーの好みプロファイルを計算
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UserFlavorProfile calculateUserProfile(List<SakeItem> items) {
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if (items.isEmpty) {
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return UserFlavorProfile.neutral();
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}
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double totalAroma = 0;
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double totalSweetness = 0;
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double totalAcidity = 0;
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double totalBitterness = 0;
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double totalBody = 0;
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int count = 0;
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for (final item in items) {
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final stats = item.hiddenSpecs.tasteStats;
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if (stats.isNotEmpty) {
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totalAroma += (stats['aroma'] ?? 3).toDouble();
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totalSweetness += (stats['sweetness'] ?? 3).toDouble();
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totalAcidity += (stats['acidity'] ?? 3).toDouble();
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totalBitterness += (stats['bitterness'] ?? 3).toDouble();
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totalBody += (stats['body'] ?? 3).toDouble();
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count++;
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}
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}
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if (count == 0) {
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return UserFlavorProfile.neutral();
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}
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return UserFlavorProfile(
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aroma: totalAroma / count,
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sweetness: totalSweetness / count,
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acidity: totalAcidity / count,
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bitterness: totalBitterness / count,
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body: totalBody / count,
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);
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}
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/// さけのわTOP100から類似銘柄を取得
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Future<List<SakenowaRecommendation>> getRecommendations({
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required UserFlavorProfile userProfile,
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required List<SakeItem> existingItems,
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int limit = 10,
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}) async {
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try {
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// ランキングとフレーバーチャートを取得
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final rankings = await _sakenowaService.getRankings();
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final flavorCharts = await _sakenowaService.getFlavorCharts();
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final brands = await _sakenowaService.getBrands();
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final breweries = await _sakenowaService.getBreweries();
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final areas = await _sakenowaService.getAreas();
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// 既存の銘柄名をセットに変換（重複チェック用）
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final existingNames = existingItems
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.map((i) => i.displayData.displayName.toLowerCase())
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.toSet();
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final recommendations = <SakenowaRecommendation>[];
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for (final ranking in rankings.take(100)) {
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// ブランド情報を取得
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final brand = brands.cast<SakenowaBrand?>().firstWhere(
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(b) => b?.id == ranking.brandId,
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orElse: () => null,
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);
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if (brand == null) continue;
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// 既に飲んだ銘柄は除外
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if (existingNames.contains(brand.name.toLowerCase())) continue;
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// フレーバーチャートを取得
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final chart = flavorCharts.cast<SakenowaFlavorChart?>().firstWhere(
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(c) => c?.brandId == ranking.brandId,
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orElse: () => null,
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);
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// 蔵元情報
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final brewery = breweries.cast<SakenowaBrewery?>().firstWhere(
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(b) => b?.id == brand.breweryId,
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orElse: () => null,
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);
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// 地域情報
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final area = areas.cast<SakenowaArea?>().firstWhere(
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(a) => a?.id == brewery?.areaId,
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orElse: () => null,
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);
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// マッチ度を計算
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final matchScore = _calculateMatchScore(userProfile, chart);
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recommendations.add(SakenowaRecommendation(
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brand: brand,
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brewery: brewery,
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area: area,
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flavorChart: chart,
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rank: ranking.rank,
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matchScore: matchScore,
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));
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}
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// マッチ度でソートして上位を返す
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recommendations.sort((a, b) => b.matchScore.compareTo(a.matchScore));
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return recommendations.take(limit).toList();
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} catch (e) {
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// エラー時は空リストを返す
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return [];
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}
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}
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/// ユーザー好みとさけのわフレーバーのマッチ度を計算
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double _calculateMatchScore(
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UserFlavorProfile user,
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SakenowaFlavorChart? chart,
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) {
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if (chart == null) return 0.5; // デフォルト中程度
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// 六軸を五味にマッピング
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// 華やか・芳醇 → 香り
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// 芳醇 → 甘み
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// 軽快 → 酸味/キレ
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// 重厚 → コク
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// 各軸は0.0〜1.0の値
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final f1 = chart.f1; // 華やか
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final f2 = chart.f2; // 芳醇
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// final f3 = chart.f3; // 重厚
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// final f4 = chart.f4; // 穏やか
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// final f5 = chart.f5; // ドライ
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final f6 = chart.f6; // 軽快
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// ユーザー好みを0.0〜1.0に正規化（1〜5を0〜1に）
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double normalize(double value) => (value - 1) / 4;
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final userAroma = normalize(user.aroma);
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final userSweetness = normalize(user.sweetness);
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final userAcidity = normalize(user.acidity);
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// 各要素の差分を計算
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double diff = 0;
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diff += (userAroma - (f1 + f2) / 2).abs(); // 香り ↔ 華やか・芳醇
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diff += (userSweetness - f2).abs(); // 甘み ↔ 芳醇
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diff += (userAcidity - f6).abs(); // 酸味 ↔ 軽快
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// 差分をスコアに変換（差が小さいほど高スコア）
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// 最大差は3.0（各要素1.0ずつ）
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final similarity = 1.0 - (diff / 3.0);
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// 0.4〜1.0の範囲にスケール
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return 0.4 + (similarity * 0.6);
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}
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}
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/// ユーザーの好みプロファイル
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class UserFlavorProfile {
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final double aroma;
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final double sweetness;
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final double acidity;
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final double bitterness;
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final double body;
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UserFlavorProfile({
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required this.aroma,
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required this.sweetness,
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required this.acidity,
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required this.bitterness,
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required this.body,
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});
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/// デフォルト（ニュートラル）プロファイル
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factory UserFlavorProfile.neutral() {
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return UserFlavorProfile(
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aroma: 3.0,
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sweetness: 3.0,
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acidity: 3.0,
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bitterness: 3.0,
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body: 3.0,
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);
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}
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}
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/// さけのわおすすめ結果
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class SakenowaRecommendation {
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final SakenowaBrand brand;
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final SakenowaBrewery? brewery;
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final SakenowaArea? area;
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final SakenowaFlavorChart? flavorChart;
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final int rank;
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final double matchScore;
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SakenowaRecommendation({
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required this.brand,
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this.brewery,
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this.area,
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this.flavorChart,
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required this.rank,
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required this.matchScore,
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});
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/// マッチパーセンテージ
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int get matchPercent => (matchScore * 100).round();
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/// 地域名（都道府県）
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String get areaName => area?.name ?? '不明';
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/// 蔵元名
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String get breweryName => brewery?.name ?? '不明';
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/// フレーバー特徴（上位2つ）
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List<String> get flavorFeatures {
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if (flavorChart == null) return [];
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final labels = {
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'f1': '華やか',
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'f2': '芳醇',
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'f3': '重厚',
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'f4': '穏やか',
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'f5': 'ドライ',
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'f6': '軽快',
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};
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final values = {
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'f1': flavorChart!.f1,
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'f2': flavorChart!.f2,
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'f3': flavorChart!.f3,
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'f4': flavorChart!.f4,
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'f5': flavorChart!.f5,
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'f6': flavorChart!.f6,
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};
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// 上位2つを取得
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final sorted = values.entries.toList()
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..sort((a, b) => b.value.compareTo(a.value));
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return sorted
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.take(2)
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.where((e) => e.value > 0.3) // 閾値以上のみ
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.map((e) => labels[e.key]!)
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.toList();
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}
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}
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