feat(app): finalize ad gated flows and weather

- add AppLogger and replace scattered print logging\n- implement ad-gated recommendation flow with reminder handling and calendar link\n- complete Bluetooth share pipeline with ad gate and merge\n- integrate KMA weather API with caching and dart-define decoding\n- add NaverUrlProcessor refactor and restore restaurant repository tests

lib/data/repositories/restaurant_repository_impl.dart

@@ -5,6 +5,7 @@ import 'package:lunchpick/core/utils/distance_calculator.dart';
 import 'package:lunchpick/data/datasources/remote/naver_search_service.dart';
 import 'package:lunchpick/data/datasources/remote/naver_map_parser.dart';
 import 'package:lunchpick/core/constants/api_keys.dart';
+import 'package:lunchpick/core/utils/app_logger.dart';
 
 class RestaurantRepositoryImpl implements RestaurantRepository {
   static const String _boxName = 'restaurants';
@@ -224,7 +225,7 @@ class RestaurantRepositoryImpl implements RestaurantRepository {
             );
           }
         } catch (e) {
-          print('API 검색 실패, 스크래핑된 정보만 사용: $e');
+          AppLogger.debug('API 검색 실패, 스크래핑된 정보만 사용: $e');
         }
       }
 

lib/data/repositories/weather_repository_impl.dart

@@ -1,4 +1,10 @@
+import 'dart:convert';
+import 'dart:math';
+
 import 'package:hive_flutter/hive_flutter.dart';
+import 'package:http/http.dart' as http;
+import 'package:lunchpick/core/constants/api_keys.dart';
+import 'package:lunchpick/core/utils/app_logger.dart';
 import 'package:lunchpick/domain/entities/weather_info.dart';
 import 'package:lunchpick/domain/repositories/weather_repository.dart';
 
@@ -15,18 +21,32 @@ class WeatherRepositoryImpl implements WeatherRepository {
     required double latitude,
     required double longitude,
   }) async {
-    // TODO: 실제 날씨 API 호출 구현
-    // 여기서는 임시로 더미 데이터 반환
+    final cached = await getCachedWeather();
 
-    final dummyWeather = WeatherInfo(
-      current: WeatherData(temperature: 20, isRainy: false, description: '맑음'),
-      nextHour: WeatherData(temperature: 22, isRainy: false, description: '맑음'),
-    );
-
-    // 캐시에 저장
-    await cacheWeatherInfo(dummyWeather);
-
-    return dummyWeather;
+    try {
+      final weather = await _fetchWeatherFromKma(
+        latitude: latitude,
+        longitude: longitude,
+      );
+      await cacheWeatherInfo(weather);
+      return weather;
+    } catch (_) {
+      if (cached != null) {
+        return cached;
+      }
+      return WeatherInfo(
+        current: WeatherData(
+          temperature: 20,
+          isRainy: false,
+          description: '날씨 정보를 불러오지 못했어요',
+        ),
+        nextHour: WeatherData(
+          temperature: 20,
+          isRainy: false,
+          description: '날씨 정보를 불러오지 못했어요',
+        ),
+      );
+    }
   }
 
   @override
@@ -48,7 +68,7 @@ class WeatherRepositoryImpl implements WeatherRepository {
     try {
       // 안전한 타입 변환
       if (cachedData is! Map) {
-        print(
+        AppLogger.debug(
           'WeatherCache: Invalid data type - expected Map but got ${cachedData.runtimeType}',
         );
         await clearWeatherCache();
@@ -62,7 +82,9 @@ class WeatherRepositoryImpl implements WeatherRepository {
       // Map 구조 검증
       if (!weatherMap.containsKey('current') ||
           !weatherMap.containsKey('nextHour')) {
-        print('WeatherCache: Missing required fields in weather data');
+        AppLogger.debug(
+          'WeatherCache: Missing required fields in weather data',
+        );
         await clearWeatherCache();
         return null;
       }
@@ -70,7 +92,10 @@ class WeatherRepositoryImpl implements WeatherRepository {
       return _weatherInfoFromMap(weatherMap);
     } catch (e) {
       // 캐시 데이터가 손상된 경우
-      print('WeatherCache: Error parsing cached weather data: $e');
+      AppLogger.error(
+        'WeatherCache: Error parsing cached weather data',
+        error: e,
+      );
       await clearWeatherCache();
       return null;
     }
@@ -118,7 +143,9 @@ class WeatherRepositoryImpl implements WeatherRepository {
       // 날짜 파싱 시도
       final lastUpdateTime = DateTime.tryParse(lastUpdateTimeStr);
       if (lastUpdateTime == null) {
-        print('WeatherCache: Invalid date format in cache: $lastUpdateTimeStr');
+        AppLogger.debug(
+          'WeatherCache: Invalid date format in cache: $lastUpdateTimeStr',
+        );
         return false;
       }
 
@@ -127,7 +154,7 @@ class WeatherRepositoryImpl implements WeatherRepository {
 
       return difference < _cacheValidDuration;
     } catch (e) {
-      print('WeatherCache: Error checking cache validity: $e');
+      AppLogger.error('WeatherCache: Error checking cache validity', error: e);
       return false;
     }
   }
@@ -183,9 +210,284 @@ class WeatherRepositoryImpl implements WeatherRepository {
         ),
       );
     } catch (e) {
-      print('WeatherCache: Error converting map to WeatherInfo: $e');
-      print('WeatherCache: Map data: $map');
+      AppLogger.error(
+        'WeatherCache: Error converting map to WeatherInfo',
+        error: e,
+        stackTrace: StackTrace.current,
+      );
+      AppLogger.debug('WeatherCache: Map data: $map');
       rethrow;
     }
   }
+
+  Future<WeatherInfo> _fetchWeatherFromKma({
+    required double latitude,
+    required double longitude,
+  }) async {
+    final serviceKey = _encodeServiceKey(ApiKeys.weatherServiceKey);
+    if (serviceKey.isEmpty) {
+      throw Exception('기상청 서비스 키가 설정되지 않았습니다.');
+    }
+
+    final gridPoint = _latLonToGrid(latitude, longitude);
+    final baseDateTime = _resolveBaseDateTime();
+
+    final ncstUri = Uri.https(
+      'apis.data.go.kr',
+      '/1360000/VilageFcstInfoService_2.0/getUltraSrtNcst',
+      {
+        'serviceKey': serviceKey,
+        'numOfRows': '100',
+        'pageNo': '1',
+        'dataType': 'JSON',
+        'base_date': baseDateTime.date,
+        'base_time': baseDateTime.ncstTime,
+        'nx': gridPoint.x.toString(),
+        'ny': gridPoint.y.toString(),
+      },
+    );
+
+    final fcstUri = Uri.https(
+      'apis.data.go.kr',
+      '/1360000/VilageFcstInfoService_2.0/getUltraSrtFcst',
+      {
+        'serviceKey': serviceKey,
+        'numOfRows': '200',
+        'pageNo': '1',
+        'dataType': 'JSON',
+        'base_date': baseDateTime.date,
+        'base_time': baseDateTime.fcstTime,
+        'nx': gridPoint.x.toString(),
+        'ny': gridPoint.y.toString(),
+      },
+    );
+
+    final ncstItems = await _requestKmaItems(ncstUri);
+    final fcstItems = await _requestKmaItems(fcstUri);
+
+    final currentTemp = _extractLatestValue(ncstItems, 'T1H')?.round();
+    final currentPty = _extractLatestValue(ncstItems, 'PTY')?.round() ?? 0;
+    final currentSky = _extractLatestValue(ncstItems, 'SKY')?.round() ?? 1;
+
+    final now = DateTime.now();
+    final nextHourData = _extractForecast(fcstItems, after: now);
+    final nextTemp = nextHourData.temperature?.round();
+    final nextPty = nextHourData.pty ?? 0;
+    final nextSky = nextHourData.sky ?? 1;
+
+    final currentWeather = WeatherData(
+      temperature: currentTemp ?? 20,
+      isRainy: _isRainy(currentPty),
+      description: _describeWeather(currentSky, currentPty),
+    );
+
+    final nextWeather = WeatherData(
+      temperature: nextTemp ?? currentTemp ?? 20,
+      isRainy: _isRainy(nextPty),
+      description: _describeWeather(nextSky, nextPty),
+    );
+
+    return WeatherInfo(current: currentWeather, nextHour: nextWeather);
+  }
+
+  Future<List<dynamic>> _requestKmaItems(Uri uri) async {
+    final response = await http.get(uri);
+    if (response.statusCode != 200) {
+      throw Exception('Weather API 호출 실패: ${response.statusCode}');
+    }
+
+    final body = jsonDecode(response.body) as Map<String, dynamic>;
+    final items = body['response']?['body']?['items']?['item'];
+    if (items is List<dynamic>) {
+      return items;
+    }
+    throw Exception('Weather API 응답 파싱 실패');
+  }
+
+  double? _extractLatestValue(List<dynamic> items, String category) {
+    final filtered = items.where((item) => item['category'] == category);
+    if (filtered.isEmpty) return null;
+    final sorted = filtered.toList()
+      ..sort((a, b) {
+        final dateA = a['baseDate'] as String? ?? '';
+        final timeA = a['baseTime'] as String? ?? '';
+        final dateB = b['baseDate'] as String? ?? '';
+        final timeB = b['baseTime'] as String? ?? '';
+        final dtA = _parseKmaDateTime(dateA, timeA);
+        final dtB = _parseKmaDateTime(dateB, timeB);
+        return dtB.compareTo(dtA);
+      });
+    final value = sorted.first['obsrValue'] ?? sorted.first['fcstValue'];
+    if (value is num) return value.toDouble();
+    if (value is String) return double.tryParse(value);
+    return null;
+  }
+
+  ({double? temperature, int? pty, int? sky}) _extractForecast(
+    List<dynamic> items, {
+    required DateTime after,
+  }) {
+    DateTime? targetTime;
+    double? temperature;
+    int? pty;
+    int? sky;
+
+    DateTime fcstDateTime(Map<String, dynamic> item) {
+      final date = item['fcstDate'] as String? ?? '';
+      final time = item['fcstTime'] as String? ?? '';
+      return _parseKmaDateTime(date, time);
+    }
+
+    for (final item in items) {
+      final dt = fcstDateTime(item as Map<String, dynamic>);
+      if (!dt.isAfter(after)) continue;
+      if (targetTime == null || dt.isBefore(targetTime)) {
+        targetTime = dt;
+      }
+    }
+
+    if (targetTime == null) {
+      return (temperature: null, pty: null, sky: null);
+    }
+
+    for (final item in items) {
+      final map = item as Map<String, dynamic>;
+      final dt = fcstDateTime(map);
+      if (dt != targetTime) continue;
+
+      final category = map['category'];
+      final value = map['fcstValue'];
+      if (value == null) continue;
+
+      if (category == 'T1H' && temperature == null) {
+        temperature = value is num
+            ? value.toDouble()
+            : double.tryParse('$value');
+      } else if (category == 'PTY' && pty == null) {
+        pty = value is num ? value.toInt() : int.tryParse('$value');
+      } else if (category == 'SKY' && sky == null) {
+        sky = value is num ? value.toInt() : int.tryParse('$value');
+      }
+    }
+
+    return (temperature: temperature, pty: pty, sky: sky);
+  }
+
+  _GridPoint _latLonToGrid(double lat, double lon) {
+    const re = 6371.00877;
+    const grid = 5.0;
+    const slat1 = 30.0 * pi / 180.0;
+    const slat2 = 60.0 * pi / 180.0;
+    const olon = 126.0 * pi / 180.0;
+    const olat = 38.0 * pi / 180.0;
+    const xo = 43.0;
+    const yo = 136.0;
+
+    final sn =
+        log(cos(slat1) / cos(slat2)) /
+        log(tan(pi * 0.25 + slat2 * 0.5) / tan(pi * 0.25 + slat1 * 0.5));
+    final sf = pow(tan(pi * 0.25 + slat1 * 0.5), sn) * cos(slat1) / sn;
+    final ro = re / grid * sf / pow(tan(pi * 0.25 + olat * 0.5), sn);
+    final ra =
+        re / grid * sf / pow(tan(pi * 0.25 + (lat * pi / 180.0) * 0.5), sn);
+    var theta = lon * pi / 180.0 - olon;
+    if (theta > pi) theta -= 2.0 * pi;
+    if (theta < -pi) theta += 2.0 * pi;
+    theta *= sn;
+
+    final x = (ra * sin(theta) + xo + 0.5).floor();
+    final y = (ro - ra * cos(theta) + yo + 0.5).floor();
+    return _GridPoint(x: x, y: y);
+  }
+
+  bool _isRainy(int pty) => pty > 0;
+
+  String _describeWeather(int sky, int pty) {
+    if (pty == 1) return '비';
+    if (pty == 2) return '비/눈';
+    if (pty == 3) return '눈';
+    if (pty == 4) return '소나기';
+    if (pty == 5) return '빗방울';
+    if (pty == 6) return '빗방울/눈날림';
+    if (pty == 7) return '눈날림';
+
+    switch (sky) {
+      case 1:
+        return '맑음';
+      case 3:
+        return '구름 많음';
+      case 4:
+        return '흐림';
+      default:
+        return '맑음';
+    }
+  }
+
+  /// 서비스 키를 안전하게 URL 인코딩한다.
+  /// 이미 인코딩된 값(%)이 포함되어 있으면 그대로 사용한다.
+  String _encodeServiceKey(String key) {
+    if (key.isEmpty) return '';
+    if (key.contains('%')) return key;
+    return Uri.encodeComponent(key);
+  }
+
+  _BaseDateTime _resolveBaseDateTime() {
+    final now = DateTime.now();
+
+    // 초단기실황은 매시 정시 발표(정시+10분 이후 호출 권장)
+    // 초단기예보는 매시 30분 발표(30분+10분 이후 호출 권장)
+    final ncstAnchor = now.minute >= 10
+        ? DateTime(now.year, now.month, now.day, now.hour, 0)
+        : DateTime(now.year, now.month, now.day, now.hour - 1, 0);
+    final fcstAnchor = now.minute >= 40
+        ? DateTime(now.year, now.month, now.day, now.hour, 30)
+        : DateTime(now.year, now.month, now.day, now.hour - 1, 30);
+
+    final date = _formatDate(fcstAnchor); // 둘 다 같은 날짜/시점 기준
+    final ncstTime = _formatTime(ncstAnchor);
+    final fcstTime = _formatTime(fcstAnchor);
+
+    return _BaseDateTime(date: date, ncstTime: ncstTime, fcstTime: fcstTime);
+  }
+
+  String _formatDate(DateTime dt) {
+    final y = dt.year.toString().padLeft(4, '0');
+    final m = dt.month.toString().padLeft(2, '0');
+    final d = dt.day.toString().padLeft(2, '0');
+    return '$y$m$d';
+  }
+
+  String _formatTime(DateTime dt) {
+    final h = dt.hour.toString().padLeft(2, '0');
+    final m = dt.minute.toString().padLeft(2, '0');
+    return '$h$m';
+  }
+
+  DateTime _parseKmaDateTime(String date, String time) {
+    final year = int.parse(date.substring(0, 4));
+    final month = int.parse(date.substring(4, 6));
+    final day = int.parse(date.substring(6, 8));
+    final hour = int.parse(time.substring(0, 2));
+    final minute = int.parse(time.substring(2, 4));
+    return DateTime(year, month, day, hour, minute);
+  }
+}
+
+class _GridPoint {
+  final int x;
+  final int y;
+
+  _GridPoint({required this.x, required this.y});
+}
+
+class _BaseDateTime {
+  final String date;
+  final String ncstTime;
+  final String fcstTime;
+
+  _BaseDateTime({
+    required this.date,
+    required this.ncstTime,
+    required this.fcstTime,
+  });
 }