feat: return best matching document

backend/src/main/java/ch/xxx/aidoclibchat/usecase/mapping/DocumentMapper.java

@@ -50,17 +50,25 @@ public Document toEntity(DocumentDto dto) {
 	}
 
 	public DocumentDto toDto(Document entity) {
+		return this.toDto(entity, false);
+	}
+
+	private DocumentDto toDto(Document entity, boolean noContent) {
 		var dto = new DocumentDto();
-		dto.setDocumentContent(entity.getDocumentContent());
+		dto.setDocumentContent(noContent ? null : entity.getDocumentContent());
 		dto.setDocumentName(entity.getDocumentName());
 		dto.setDocumentType(entity.getDocumentType());
 		dto.setId(entity.getId());
 		return dto;
 	}
-
+
+	public DocumentDto toDtoNoContent(Document entity) {
+		return this.toDto(entity, true);
+	}
+
 	public DocumentSearchDto toDto(AiResult aiResult) {
 		var dto = new DocumentSearchDto();
-		dto.setDocuments(aiResult.documents().stream().map(myDoc -> this.toDto(myDoc)).toList());
+		dto.setDocuments(aiResult.documents().stream().map(myDoc -> this.toDtoNoContent(myDoc)).toList());
 		dto.setResultStrings(aiResult.generations().stream().map(myGen -> myGen.getText()).toList());
 		dto.setSearchString(aiResult.searchString());
 		return dto;

backend/src/main/java/ch/xxx/aidoclibchat/usecase/service/DocumentService.java

@@ -46,6 +46,7 @@
 public class DocumentService {
 	private static final Logger LOGGER = LoggerFactory.getLogger(DocumentService.class);
 	private static final String ID = "id";
+	private static final String DISTANCE = "distance";
 	private final DocumentRepository documentRepository;
 	private final DocumentVsRepository documentVsRepository;
 	private final AiClient aiClient;
@@ -83,18 +84,27 @@ record TikaDocumentAndContent(org.springframework.ai.document.Document document,
 	public AiResult queryDocuments(String query) {
 		var similarDocuments = this.documentVsRepository.retrieve(query);
 		LOGGER.info("Documents: {}", similarDocuments.size());
-		Message systemMessage = this.getSystemMessage(similarDocuments,
-				(similarDocuments.size() <= 0 ? 2000 : Math.floorDiv(2000, similarDocuments.size())));
+		var mostSimilar = similarDocuments.stream()
+				.sorted((myDocA, myDocB) -> ((Float) myDocA.getMetadata().get(DISTANCE))
+						.compareTo(((Float) myDocB.getMetadata().get(DISTANCE))))
+				.findFirst();
+		var documentChunks = mostSimilar.stream()
+				.flatMap(mySimilar -> similarDocuments.stream()
+						.filter(mySimilar1 -> mySimilar1.getMetadata().get(ID).equals(mySimilar.getMetadata().get(ID))))
+				.toList();
+		Message systemMessage = this.getSystemMessage(documentChunks,
+				(documentChunks.size() <= 0 ? 2000 : Math.floorDiv(2000, documentChunks.size())));
 		UserMessage userMessage = new UserMessage(query);
 		Prompt prompt = new Prompt(List.of(systemMessage, userMessage));
 		LocalDateTime start = LocalDateTime.now();
 		AiResponse response = aiClient.generate(prompt);
 		LOGGER.info("AI response time: {}ms",
 				ZonedDateTime.of(LocalDateTime.now(), ZoneId.systemDefault()).toInstant().toEpochMilli()
 						- ZonedDateTime.of(start, ZoneId.systemDefault()).toInstant().toEpochMilli());
-		var documents = response.getGenerations().stream().map(myGen -> myGen.getInfo().get(ID))
-				.filter(myId -> (myId instanceof Long)).map(myId -> this.documentRepository.findById((Long) myId))
-				.filter(Optional::isPresent).map(Optional::get).toList();
+		var documents = mostSimilar.stream().map(myGen -> myGen.getMetadata().get(ID))
+				.map(myId -> (myId instanceof Integer ? Integer.valueOf((Integer) myId).longValue() : (Long) myId))
+				.map(myId -> this.documentRepository.findById(myId)).filter(Optional::isPresent).map(Optional::get)
+				.toList();
 		return new AiResult(query, response.getGenerations(), documents);
 	}