2chBackAPI/BufferControllers/APIThreadBuffer.cs

using NeDvachAPI.DBControllers;
using NeDvachAPI.Models;

namespace NeDvachAPI.BufferControllers
{
    public class APIThreadBuffer
    {
        private static List<Post>[] ThreadsPrewievs = new List<Post>[0];
        private static List<Post>[] Threads = new List<Post>[0];
        public static void WriteThreadPreviewsBuffer(List<Post> OPPostsToWrite)    //add list of OP-posts and last post to buffer
        {
            for(int pos = 0; pos < OPPostsToWrite.Count; pos ++)
            {
                var deb = new List<Post>();
                deb.Add(OPPostsToWrite[pos]);
                ThreadsPrewievs = ThreadsPrewievs.Append(deb).ToArray();
            }
        }

        public static void AppendToThreadPreviews(int index,Post toAppend)
        {
            ThreadsPrewievs[index].Add(toAppend);
        }

        public static List<Post>[] GetThreadPreviews()
        {
            return ThreadsPrewievs;
        }

        public static void UpdateThreadsPreviews(int threadId)
        {
            Console.WriteLine("Пытаюсь обновить превью треда " + threadId);

            var newPreview = new List<Post>();
            newPreview.Add(ThreadsPrewievs[threadId -1][0]);
            int targetLength = APIThreadBuffer.GetThreadLength(threadId - 1);
                for (int lastofthree =  targetLength- 2; lastofthree <=  targetLength; lastofthree ++)
                {
                    newPreview.Add(GetSinglePost(threadId - 1,lastofthree));
                } 
            ThreadsPrewievs[threadId -1] = newPreview;
        }

        public static void AppendThreadsBuffer(List<Post> ThreadToAdd)  //add thread's posts from DB to buffer
        {
            Threads = Threads.Append(ThreadToAdd).ToArray();
        }

        public static int GetThreadLength(int threadId)
        {
            return Threads[threadId].Count;
        }

        public static List<Post> GetThread(int threadId)
        {
            if (threadId < Threads.Length + 1 & threadId != 0)
            {
                return Threads[threadId - 1];
            }
            else return null;
        }

        public static Post GetSinglePost(int thread, int postPosition)
        {
            List<Post> postsList = Threads[thread];
            return postsList[postPosition-1];
        }

        public static void UpdateThreadPosts(int threadId)
        {
            Console.WriteLine("Пытаюсь обновить тред " + threadId);
            Threads[threadId - 1] = DBchat.PostsList("b", threadId);
        }

        public static void RefreshThread(int threadId)
        {
            UpdateThreadPosts(threadId);
            UpdateThreadsPreviews(threadId);
        }

    }
}