NCBACK-34 add logic to find similar image in db

src/main/java/ru/soune/nocopy/repository/ImageHashRepository.java

@@ -0,0 +1,9 @@
+package ru.soune.nocopy.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import ru.soune.nocopy.entity.file.ImageHashEntity;
+
+@Repository
+public interface ImageHashRepository extends JpaRepository<ImageHashEntity, String> {
+}

src/main/java/ru/soune/nocopy/repository/ImageSimilarityRepository.java

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+package ru.soune.nocopy.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+import org.springframework.stereotype.Repository;
+import ru.soune.nocopy.entity.file.FileEntity;
+
+import java.util.List;
+
+@Repository
+public interface ImageSimilarityRepository
+        extends JpaRepository<FileEntity, String> {
+
+    @Query(value = """
+        SELECT
+            f.id AS similarFileId,
+            f.original_file_name AS originalFileName,
+            f.file_size AS fileSize,
+            h.hash64_hi AS hash64Hi,
+            h.hash64_lo AS hash64Lo
+        FROM image_hashes ref
+        JOIN image_hashes h
+            ON ref.file_id <> h.file_id
+        JOIN file_entities f
+            ON f.id = h.file_id
+        WHERE ref.file_id = :fileId
+        """,
+            nativeQuery = true)
+    List<SimilarImageProjection> findCandidates(
+            @Param("fileId") String fileId
+    );
+}
+
+

src/main/java/ru/soune/nocopy/repository/SimilarImageProjection.java

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+package ru.soune.nocopy.repository;
+
+public interface SimilarImageProjection {
+
+    String getSimilarFileId();
+
+    String getOriginalFileName();
+
+    Long getFileSize();
+
+    Integer getHash64Hi();
+
+    Integer getHash64Lo();
+}