Propper file manager with encryption of files

PolyChat/Models/FileManager.cs

@@ -5,12 +5,131 @@ using System.Text;
 using System.Threading.Tasks;
 using System.IO;
 using System.Security.Cryptography;
-
+using System.Diagnostics;
+using System.Threading;
+using Newtonsoft.Json.Linq;
 
 namespace PolyChat.Models
 {
     class FileManager
     {
+        // Controller
+        private readonly MainPage UIController;
+
+        public FileManager(MainPage uiController)
+        {
+            UIController = uiController;
+        }
+
+        /// <summary>
+        /// sends chatlogs as json array to uiController wit corrosponding ip
+        /// 
+        /// in ui when chat is clicked connection gets established
+        /// </summary>
+        /// <param name="ip"></param>
+        public void loadChats()
+        {
+            //load dir and create if non existant
+            if (Directory.Exists("U:\\PolyChat\\Saves"))
+            {
+                Debug.WriteLine("--Path exists.--");
+            }
+            else
+            {
+                Directory.CreateDirectory("U:\\PolyChat\\Saves");
+                Debug.WriteLine("--Path Created--.");
+            }
+
+            //go through all files and send ip and json array to ui
+            String[] filepaths = Directory.GetFiles("U:\\PolyChat\\Saves");
+            if (filepaths.Length > 0)
+            {
+                Debug.WriteLine("---Loading Saves");
+                foreach (String path in filepaths)
+                {
+                    Debug.WriteLine($"--{path}");
+                    String jsonArr = decrypt(File.ReadAllText(path));
+                    String ip = Path.GetFileName(path);
+                    ip = ip.Substring(0, ip.Length - 4);
+                    Debug.WriteLine($"-{ip}");
+                    Debug.WriteLine(jsonArr);
+                    UIController.OnIncomingConnection(ip);
+                    UIController.OnIncomingMessages(ip, jsonArr);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Saves incoming chat message to 
+        /// </summary>
+        /// <param name="ip"></param>
+        /// <param name="json"></param>
+        public void saveChats(string ip, string json, DateTime timeStamp)
+        {
+            //Vielleicht noch so machen dass die mit gleicher ip nacheinander gemacht
+            //werden damit es nicht zu überschreibungen kommt vielleicth auch ganz oben oder am ende ne
+            //writing flag setzen oder auch in der datei selbst ne flag setzen
+            new Thread(() =>
+            {
+                //breaking if namechange
+                JObject obj = JObject.Parse(json);
+                if (!obj["type"].ToString().Equals("username"))
+                {
+                    //adding timestamp
+                    obj = JObject.Parse(json);
+                    obj.Add(new JProperty("timestamp", timeStamp));
+                    json = obj.ToString();
+                    if (File.Exists($"U:\\PolyChat\\Saves\\{ip}.txt"))
+                    {
+                        Debug.WriteLine("--File allready exists--");
+                        //check for integraty of file
+                        string output = decrypt(File.ReadAllText($"U:\\PolyChat\\Saves\\{ip}.txt"));
+                        Debug.WriteLine($"---{output}---");
+                        if (output.Substring(0, 1).Equals("[") && output.Substring(output.Length - 1, 1).Equals("]"))
+                        {
+                            Debug.WriteLine("--adding new chatmessage--");
+                            //structure intact
+                            //save new chat
+                            String saved = output.Substring(0, output.Length - 1);
+                            output = saved + ", " + json + " ]";
+                            File.Delete($"U:\\PolyChat\\Saves\\{ip}.txt");
+                            File.WriteAllText($"U:\\PolyChat\\Saves\\{ip}.txt", encrypt(output));
+                        }
+                        else
+                        {
+                            Debug.WriteLine("--Structure not intact--");
+                            Debug.WriteLine("--redoing file--");
+                            //structure not intact
+                            //redo file
+                            File.Delete($"U:\\PolyChat\\Saves\\{ip}.txt");
+                            File.WriteAllText($"U:\\PolyChat\\Saves\\{ip}.txt", encrypt($"[ {json} ]"));
+                        }
+                    }
+                    else
+                    {
+                        Debug.WriteLine("--Creating new File--");
+                        //setup file
+                        File.WriteAllText($"U:\\PolyChat\\Saves\\{ip}.txt", encrypt($"[ {json} ]"));
+                    }
+                }
+            }).Start();
+        }
+
+
+        //---------------------------------------------------------------------------------------------------
+        //security
+        //---------------------------------------------------------------------------------------------------
+        private void genKeys() 
+        { 
+            
+        }
+
+
+        /// <summary>
+        /// does exactly what it says. XD
+        /// </summary>
+        /// <param name="toEncrypt"></param>
+        /// <returns></returns>
         public static String encrypt(String toEncrypt)
         {
             try {
@@ -41,7 +160,11 @@ namespace PolyChat.Models
 
         }
 
-
+        /// <summary>
+        /// does exactly what it says. XD
+        /// </summary>
+        /// <param name="toEncrypt"></param>
+        /// <returns></returns>
         public static String decrypt(String toDecrypt)
         {
             try