Merge pull request #9 from Cotatus/feat/8-emotional-index-updown

Feat: 감성 지수 변화 방향 조회 API 구현

Author: Jinseong01

src/main/java/com/server/cotatus/controller/EmotionalIndexController.java

@@ -8,6 +8,8 @@
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.Map;
+
 @RestController
 @RequestMapping("/api/emotional-index")
 @RequiredArgsConstructor
@@ -28,4 +30,11 @@ public ResponseEntity<Object> getEmotionalIndices(
 
         return ResponseEntity.ok(response);
     }
+
+    @GetMapping("/change-directions")
+    @Operation(summary = "감성 지수 변화 방향 조회", description = "각 코인별 최근 감성 지수의 변화 방향(상승/하락/유지)을 조회합니다.")
+    public ResponseEntity<Map<String, String>> getChangeDirections() {
+        Map<String, String> response = emotionalIndexService.getChangeDirections();
+        return ResponseEntity.ok(response);
+    }
 }

src/main/java/com/server/cotatus/repository/EmotionalIndexRepository.java

@@ -6,9 +6,13 @@
 import org.springframework.stereotype.Repository;
 
 import java.util.List;
+import java.util.Optional;
 
 @Repository
 public interface EmotionalIndexRepository extends JpaRepository<EmotionalIndex, Long> {
     // 특정 코인의 최근 9개
     List<EmotionalIndex> findTop9ByCoinOrderByCreatedAtDesc(Coin coin);
+
+    // 특정 코인의 최근 1개
+    Optional<EmotionalIndex> findTop1ByCoinOrderByCreatedAtDesc(Coin coin);
 }

src/main/java/com/server/cotatus/service/EmotionalIndexService.java

@@ -74,4 +74,17 @@ public List<EmotionalIndexDataPoint> getEmotionalIndices(String type) {
                         .build())
                 .collect(Collectors.toList());
     }
+
+    public Map<String, String> getChangeDirections() {
+        List<Coin> coins = coinRepository.findAll();
+        Map<String, String> result = new LinkedHashMap<>();
+
+        for (Coin coin : coins) {
+            String coinName = COIN_NAME_MAP.getOrDefault(coin.getId(), coin.getName());
+            emotionalIndexRepository.findTop1ByCoinOrderByCreatedAtDesc(coin)
+                    .ifPresent(index -> result.put(coinName, index.getChangeDirection().name()));
+        }
+
+        return result;
+    }
 }