[Fix] Return unique search results (#1)

Reviewed-on: #1
Co-authored-by: bivashy <botyrbojey@gmail.com>
Co-committed-by: bivashy <botyrbojey@gmail.com>

src/main/java/com/backend/search/kodik/service/anyame_backend/controller/SearchController.java

@@ -13,6 +13,7 @@ import org.springframework.web.server.ResponseStatusException;
 import com.backend.search.kodik.service.anyame_backend.api.KodikAPI;
 import com.backend.search.kodik.service.anyame_backend.api.model.KodikResponse;
 import com.backend.search.kodik.service.anyame_backend.component.KodikAPITokenProvider;
+import com.backend.search.kodik.service.anyame_backend.service.KodikSearchFilterService;
 
 import retrofit2.Response;
 
@@ -21,10 +22,13 @@ public class SearchController {
     Logger log = LoggerFactory.getLogger(SearchController.class);
     private final KodikAPI kodikAPI;
     private final KodikAPITokenProvider tokenProvider;
+    private final KodikSearchFilterService searchFilterService;
 
-    public SearchController(KodikAPI kodikAPI, KodikAPITokenProvider tokenProvider) {
+    public SearchController(KodikAPI kodikAPI, KodikAPITokenProvider tokenProvider,
+            KodikSearchFilterService searchFilterService) {
         this.kodikAPI = kodikAPI;
         this.tokenProvider = tokenProvider;
+        this.searchFilterService = searchFilterService;
     }
 
     @GetMapping("/search")
@@ -36,8 +40,7 @@ public class SearchController {
                         response.message());
                 throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "bad response, code: " + response.code());
             }
-            log.info("search result {}", response.body());
-            return response.body();
+            return searchFilterService.filter(response.body());
         } catch (IOException e) {
             log.warn("i/o error", e);
             throw new ResponseStatusException(HttpStatus.SERVICE_UNAVAILABLE, "i/o error");

src/main/java/com/backend/search/kodik/service/anyame_backend/service/KodikSearchFilterService.java

@@ -0,0 +1,37 @@
+package com.backend.search.kodik.service.anyame_backend.service;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.springframework.stereotype.Service;
+
+import com.backend.search.kodik.service.anyame_backend.api.model.KodikResponse;
+import com.backend.search.kodik.service.anyame_backend.api.model.KodikResponse.Result;
+
+@Service
+public class KodikSearchFilterService {
+
+    public KodikResponse filter(KodikResponse body) {
+        Set<String> seenIds = new HashSet<>();
+        List<Result> filteredResults = body.results.stream().filter(result -> {
+            String identifier = identifier(result);
+            boolean updated = seenIds.add(identifier);
+            return updated;
+        }).toList();
+
+        body.results = filteredResults;
+        return body;
+    }
+
+    public String identifier(Result result) {
+        List<String> identifiers = Arrays.asList(result.kinopoiskId,
+                result.imdbId,
+                result.shikimoriId,
+                result.worldartLink);
+        return identifiers.stream().filter(identifier -> identifier != null && !identifier.isBlank()).findFirst()
+                .orElse(result.id);
+    }
+
+}