NCBACK-34 add logic to find similar image in db

src/main/java/ru/soune/nocopy/service/FileSimilarityService.java

@@ -0,0 +1,62 @@
+package ru.soune.nocopy.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import ru.soune.nocopy.dto.file.SimilarFileResponse;
+import ru.soune.nocopy.repository.ImageHashRepository;
+import ru.soune.nocopy.repository.ImageSimilarityRepository;
+import ru.soune.nocopy.repository.SimilarImageProjection;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class FileSimilarityService {
+
+    private final ImageSimilarityRepository repository;
+    private final ImageHashRepository hashRepository;
+
+    public List<SimilarFileResponse> findSimilarFiles(String fileId) {
+        var imageHashEntity = hashRepository.findById(fileId)
+                .orElseThrow(() -> new RuntimeException("Hash not found"));
+
+        Integer hash64Hi = imageHashEntity.getHash64Hi();
+        Integer hash64Lo = imageHashEntity.getHash64Lo();
+
+        List<SimilarImageProjection> candidates =
+                repository.findCandidates(fileId);
+
+        return candidates.stream()
+                .map(c -> {
+                    Integer cHi = c.getHash64Hi();
+                    Integer cLo = c.getHash64Lo();
+
+                    int hamming = hamming64(hash64Hi, hash64Lo, cHi, cLo);
+
+                    String level;
+                    if (hamming <= 5) {
+                        level = "DUPLICATE";
+                    } else if (hamming <= 12) {
+                        level = "SIMILAR";
+                    } else {
+                        level = "DIFFERENT";
+                    }
+
+                    return SimilarFileResponse.builder()
+                            .fileId(c.getSimilarFileId())
+                            .originalFileName(c.getOriginalFileName())
+                            .fileSize(c.getFileSize())
+                            .hammingDistance(hamming)
+                            .similarityLevel(level)
+                            .build();
+                })
+                .sorted((a, b) ->
+                        Integer.compare(a.getHammingDistance(), b.getHammingDistance()))
+                .toList();
+    }
+
+    private int hamming64(int aHi, int aLo, int bHi, int bLo) {
+        return Integer.bitCount(aHi ^ bHi)
+                + Integer.bitCount(aLo ^ bLo);
+    }
+}

src/main/java/ru/soune/nocopy/service/ImageHashService.java

@@ -0,0 +1,154 @@
+package ru.soune.nocopy.service;
+
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+import ru.soune.nocopy.entity.file.FileEntity;
+import ru.soune.nocopy.entity.file.ImageHashEntity;
+import ru.soune.nocopy.repository.ImageHashRepository;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.LocalDateTime;
+import java.util.Arrays;
+
+@Service
+@RequiredArgsConstructor
+@Slf4j
+public class ImageHashService {
+
+    private final ImageHashRepository repository;
+
+    public void create(FileEntity file, Path imagePath) {
+        try {
+            long hash64 = computePhash64(imagePath);
+
+            int hi = high32(hash64);
+            int lo = low32(hash64);
+
+            ImageHashEntity entity = ImageHashEntity.builder()
+                    .file(file)
+                    .hash64Hi(hi)
+                    .hash64Lo(lo)
+                    .hashAlgorithm("PHASH64")
+                    .createdAt(LocalDateTime.now())
+                    .build();
+
+            repository.save(entity);
+        } catch (IOException e) {
+            throw new RuntimeException("Failed to compute image hash", e);
+        }
+    }
+
+    private long computePhash64(Path path) throws IOException {
+        try (InputStream is = Files.newInputStream(path)) {
+            BufferedImage image = ImageIO.read(is);
+            if (image == null) throw new IOException("Cannot read image file: " + path);
+
+            BufferedImage gray = toGrayScale(image);
+            BufferedImage resized = resizeImage(gray, 32, 32);
+
+            double[][] dct = applyDCT(resized);
+            double[][] topLeft = extractTopLeft8x8(dct);
+            double median = calculateMedian(topLeft, true);
+
+            return create64BitHashLong(topLeft, median);
+        }
+    }
+
+    private BufferedImage toGrayScale(BufferedImage image) {
+        BufferedImage gray = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
+        Graphics2D g = gray.createGraphics();
+        g.drawImage(image, 0, 0, null);
+        g.dispose();
+        return gray;
+    }
+
+    private BufferedImage resizeImage(BufferedImage image, int width, int height) {
+        BufferedImage resized = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
+        Graphics2D g = resized.createGraphics();
+        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+        g.drawImage(image, 0, 0, width, height, null);
+        g.dispose();
+        return resized;
+    }
+
+    private double[][] applyDCT(BufferedImage image) {
+        int w = image.getWidth();
+        int h = image.getHeight();
+        double[][] pixels = new double[h][w];
+
+        for (int y = 0; y < h; y++) {
+            for (int x = 0; x < w; x++) {
+                int gray = image.getRGB(x, y) & 0xFF;
+                pixels[y][x] = gray;
+            }
+        }
+
+        double[][] dct = new double[h][w];
+        for (int u = 0; u < h; u++) {
+            double au = u == 0 ? 1.0 / Math.sqrt(h) : Math.sqrt(2.0 / h);
+            for (int v = 0; v < w; v++) {
+                double av = v == 0 ? 1.0 / Math.sqrt(w) : Math.sqrt(2.0 / w);
+                double sum = 0.0;
+                for (int x = 0; x < h; x++) {
+                    for (int y = 0; y < w; y++) {
+                        sum += pixels[x][y] *
+                                Math.cos((2 * x + 1) * u * Math.PI / (2.0 * h)) *
+                                Math.cos((2 * y + 1) * v * Math.PI / (2.0 * w));
+                    }
+                }
+                dct[u][v] = au * av * sum;
+            }
+        }
+        return dct;
+    }
+
+    private double[][] extractTopLeft8x8(double[][] dct) {
+        double[][] block = new double[8][8];
+        for (int i = 0; i < 8; i++) System.arraycopy(dct[i], 0, block[i], 0, 8);
+        return block;
+    }
+
+    private double calculateMedian(double[][] block, boolean excludeDC) {
+        double[] vals = new double[63];
+        int idx = 0;
+        for (int i = 0; i < 8; i++) {
+            for (int j = 0; j < 8; j++) {
+                if (i == 0 && j == 0 && excludeDC) continue;
+                vals[idx++] = block[i][j];
+            }
+        }
+        Arrays.sort(vals);
+        return (vals.length % 2 == 0) ?
+                (vals[vals.length / 2 - 1] + vals[vals.length / 2]) / 2.0 :
+                vals[vals.length / 2];
+    }
+
+    private long create64BitHashLong(double[][] block, double median) {
+        long hash = 0L;
+
+        for (int i = 0; i < 8; i++) {
+            for (int j = 0; j < 8; j++) {
+                if (i == 0 && j == 0) continue;
+                hash <<= 1;
+                if (block[i][j] > median) hash |= 1;
+            }
+        }
+
+        return hash;
+    }
+
+    private int high32(long hash64) {
+        return (int) (hash64 >>> 32);
+    }
+
+    private int low32(long hash64) {
+        return (int) hash64;
+    }
+}

src/main/java/ru/soune/nocopy/service/file/FileEntityService.java

@@ -9,15 +9,17 @@ import ru.soune.nocopy.dto.file.FileResponse;
 import ru.soune.nocopy.entity.file.FileEntity;
 import ru.soune.nocopy.entity.file.FileStatus;
 import ru.soune.nocopy.entity.file.FileUploadSession;
+import ru.soune.nocopy.exception.DuplicateImageException;
 import ru.soune.nocopy.exception.FileEntityNotFoundException;
 import ru.soune.nocopy.repository.FileEntityRepository;
+import ru.soune.nocopy.service.FileSimilarityService;
+import ru.soune.nocopy.service.ImageHashService;
 
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.time.LocalDateTime;
-import java.time.ZoneOffset;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -28,6 +30,10 @@ public class FileEntityService {
 
     private final FileEntityRepository fileEntityRepository;
 
+    private final ImageHashService imageHashService;
+
+    private final FileSimilarityService fileSimilarityService;
+
     @Transactional
     public FileEntity createFromUploadSession(FileUploadSession session, String checksum) {
         log.info("Creating FileEntity for upload session: {}", session.getUploadId());
@@ -57,11 +63,28 @@ public class FileEntityService {
                     .build();
 
             FileEntity saved = fileEntityRepository.save(fileEntity);
-            log.info("FileEntity created successfully: {} (size: {} bytes)",
-                    saved.getId(), fileSize);
+
+            if (saved.getMimeType().startsWith("image")) {
+                imageHashService.create(saved, Path.of(saved.getFilePath()));
+
+                var similarFiles = fileSimilarityService.findSimilarFiles(saved.getId());
+
+                boolean hasDuplicate = similarFiles.stream()
+                        .anyMatch(f -> f.getHammingDistance() <= 5);
+
+                if (hasDuplicate) {
+                    log.warn("Duplicate image detected for upload session {}. Rolling back.",
+                            session.getUploadId());
+                    throw new DuplicateImageException("Duplicate image detected for upload session " + session.getUploadId());
+                }
+
+                similarFiles.stream()
+                        .filter(f -> f.getHammingDistance() > 5)
+                        .forEach(f -> log.info("Similar image found: {} (distance {})",
+                                f.getFileId(), f.getHammingDistance()));
+            }
 
             return saved;
-
         } catch (IOException e) {
             log.error("Failed to create FileEntity for session {}: {}",
                     session.getUploadId(), e.getMessage(), e);
@@ -69,15 +92,6 @@ public class FileEntityService {
         }
     }
 
-
-    private String extractFileExtension(String fileName) {
-        int dotIndex = fileName.lastIndexOf('.');
-        if (dotIndex > 0 && dotIndex < fileName.length() - 1) {
-            return fileName.substring(dotIndex + 1).toLowerCase();
-        }
-        return "";
-    }
-
     @Transactional(readOnly = true)
     public FileEntityResponse getById(String fileId, int version) {
         FileEntity fileEntity = fileEntityRepository.findById(fileId)
@@ -95,39 +109,6 @@ public class FileEntityService {
         return convertToResponse(fileEntity, version);
     }
 
-    @Transactional(readOnly = true)
-    public FileEntityResponse getByFilePath(String filePath, int version) {
-        FileEntity fileEntity = fileEntityRepository.findByFilePath(filePath)
-                .orElseThrow(() -> new FileEntityNotFoundException("Path: " + filePath));
-
-        return convertToResponse(fileEntity, version);
-    }
-
-
-    @Transactional(readOnly = true)
-    public FileResponse getAllUserFiles(Long userId, int version) {
-        List<FileEntity> fileEntities = fileEntityRepository.findByUserIdAndStatus(
-                userId, FileStatus.ACTIVE);
-
-        List<FileEntityResponse> files = fileEntities.stream()
-                .map(file -> convertToResponse(file, version))
-                .collect(Collectors.toList());
-
-        long totalSize = fileEntities.stream()
-                .mapToLong(FileEntity::getFileSize)
-                .sum();
-
-        return FileResponse.builder()
-                .files(files)
-                .totalCount(files.size())
-                .totalSize(totalSize)
-                .formattedTotalSize(formatFileSize(totalSize))
-                .page(1)
-                .pageSize(files.size())
-                .build();
-    }
-
-
     @Transactional(readOnly = true)
     public FileResponse getUserFiles(Long userId, int page, int pageSize, int version) {
         List<FileEntity> allFiles = fileEntityRepository.findByUserIdAndStatus(

src/main/java/ru/soune/nocopy/service/file/FileUploadServiceImpl.java

@@ -402,7 +402,7 @@ public class FileUploadServiceImpl implements FileUploadService {
                 session.getUploadId(), session.getFileName());
 
         Path finalFilePath = null;
-        String checksum = null;
+        String checksum;
 
         try {
             finalFilePath = prepareFinalFile(session);
@@ -591,44 +591,10 @@ public class FileUploadServiceImpl implements FileUploadService {
     private void handleAssemblyFailure(FileUploadSession session, Exception e) {
         session.setStatus(UploadStatus.FAILED);
         session.setLastError(e.getMessage());
+
         sessionRepository.save(session);
-
-        log.error("File assembly failed for session {}: {}",
-                session.getUploadId(), e.getMessage());
     }
 
-
-
-//    @Override
-//    @Transactional
-//    public void cleanupExpiredSessions() {
-//        log.info("Starting cleanup of expired upload sessions");
-//
-//        LocalDateTime expiryThreshold = LocalDateTime.now().minusHours(sessionExpiryHours);
-//
-//        try {
-//            var expiredSessions = sessionRepository.findByStatusInAndCreatedAtBefore(
-//                    Set.of(UploadStatus.INITIATED, UploadStatus.UPLOADING, UploadStatus.FAILED),
-//                    expiryThreshold
-//            );
-//
-//            int cleanedCount = 0;
-//            for (FileUploadSession session : expiredSessions) {
-//                session.setStatus(UploadStatus.FAILED);
-//                session.setLastError("Session expired during cleanup");
-//                sessionRepository.save(session);
-//
-//                CompletableFuture.runAsync(() -> cleanupSessionFiles(session));
-//                cleanedCount++;
-//            }
-//
-//            log.info("Cleaned up {} expired upload sessions", cleanedCount);
-//
-//        } catch (Exception e) {
-//            log.error("Error during session cleanup", e);
-//        }
-//    }
-
     private Path getChunkDirectory(Long userId, String uploadId) {
         return storageRoot.resolve("temp")
                 .resolve("user")