dev add pagination for search in internet images

src/main/java/ru/soune/nocopy/service/search/SearchApiToYandexResponseMapper.java

@@ -9,7 +9,7 @@ import java.util.List;
 public class SearchApiToYandexResponseMapper {
     private final ObjectMapper objectMapper = new ObjectMapper();
 
-    public YandexSearchResponse mapToYandexResponse(String searchApiJson) throws Exception {
+    public YandexSearchResponse mapToYandexResponse(String searchApiJson, int page, int pageSize) throws Exception {
         JsonNode root = objectMapper.readTree(searchApiJson);
 
         YandexSearchResponse response = new YandexSearchResponse();
@@ -18,9 +18,12 @@ public class SearchApiToYandexResponseMapper {
         JsonNode visualMatches = root.path("visual_matches");
 
         if (visualMatches.isArray()) {
-            for (JsonNode match : visualMatches) {
-                YandexSearchResponse.ImageResult result = new YandexSearchResponse.ImageResult();
+            int startIndex = (page - 1) * pageSize;
+            int endIndex = Math.min(startIndex + pageSize, visualMatches.size());
 
+            for (int i = startIndex; i < endIndex; i++) {
+                JsonNode match = visualMatches.get(i);
+                YandexSearchResponse.ImageResult result = new YandexSearchResponse.ImageResult();
 
                 JsonNode imageNode = match.path("image");
                 if (!imageNode.isMissingNode()) {
@@ -30,7 +33,6 @@ public class SearchApiToYandexResponseMapper {
                 }
 
                 result.setPageUrl(match.path("link").asText());
-
                 result.setPageTitle(match.path("title").asText());
 
                 String source = match.path("source").asText();
@@ -40,6 +42,11 @@ public class SearchApiToYandexResponseMapper {
                     imageResults.add(result);
                 }
             }
+
+            response.setPage(page);
+            response.setPageSize(pageSize);
+            response.setTotalResults(visualMatches.size());
+            response.setTotalPages((int) Math.ceil((double) visualMatches.size() / pageSize));
         }
 
         response.setImages(imageResults);