Update getVideoData method to iteratively get video data

YouTube API does not allow getting more than 50 videos at once, so we need to iteratively request data if the provided list with ids has more than 50 items.

src/main/java/com/ypm/service/VideoServiceImp.java

@@ -72,15 +72,27 @@ public void deleteVideo(String accessToken, String videoId) throws IOException {
 
     @Override
     public List<VideoDto> getVideoData(List<String> videoIds) throws IOException {
-        var items = youTubeClient
-            .videos()
-            .list(List.of(Part.SNIPPET.toString(), Part.CONTENT_DETAILS.toString()))
-            .setId(videoIds)
-            .setAccessToken(tokenService.getAccessToken())
-            .execute()
-            .getItems();
+        final int maxResults = 50;
+
+        // Remove duplicates from the incoming list with ids
+        videoIds = videoIds.stream().distinct().toList();
+        var videoDtoList = new ArrayList<VideoDto>();
+
+        for (int i = 0; i < videoIds.size(); i += maxResults) {
+            var subList = videoIds.subList(i, Math.min(i + maxResults, videoIds.size()));
+
+            var itemsSub = youTubeClient
+                .videos()
+                .list(List.of(Part.SNIPPET.toString(), Part.CONTENT_DETAILS.toString()))
+                .setId(subList)
+                .setOauthToken(tokenService.getAccessToken());
+
+            var videoListResponse = itemsSub.execute();
+            var videos = videoListResponse.getItems();
+            videoDtoList.addAll(VideoMapper.mapToVideoDto(videos));
+        }
 
-        return VideoMapper.mapToVideoDto(items);
+        return videoDtoList;
     }
 
     @Override