added search in contact list.

src/main/java/org/to/telegramfinalproject/Server/ClientHandler.java

@@ -1,5 +1,6 @@
 package org.to.telegramfinalproject.Server;
 
+import javafx.geometry.Side;
 import org.json.JSONArray;
 import org.json.JSONObject;
 import org.to.telegramfinalproject.Database.*;
@@ -111,10 +112,13 @@ public class ClientHandler implements Runnable {
                                 JSONObject c = new JSONObject();
                                 c.put("user_id", contact.getUser_id().toString());
                                 c.put("contact_id", contact.getContact_id().toString());
+                                User Contact = userDatabase.findByInternalUUID(contact.getContact_id());
+                                c.put("contact_displayId", Contact.getUser_id());
                                 c.put("is_blocked", contact.getIs_blocked());
 
                                 c.put("profile_name", target.getProfile_name());
                                 c.put("image_url", target.getImage_url());
+                                c.put("last_seen", Contact.getLast_seen());
 
                                 contactList.put(c);
                             }
@@ -2122,6 +2126,22 @@ public class ClientHandler implements Runnable {
                        break;
                     }
 
+                    case "search_contacts": {
+                        String user_id = requestJson.getString("user_id");
+                        String search_term = requestJson.getString("search_term");
+
+                        response = SidebarService.handleSearchContacts(user_id, search_term);
+                        break;
+                    }
+
+                    case "remove_contact": {
+                        UUID user_id = UUID.fromString(requestJson.getString("user_id"));
+                        UUID contactId = UUID.fromString(requestJson.getString("contact_id"));
+
+                        response = SidebarService.handleRemoveContact(user_id, contactId);
+                        break;
+                    }
+
                     default:
                         response = new ResponseModel("error", "Unknown action: " + action);
                 }

src/main/java/org/to/telegramfinalproject/Server/SidebarService.java

@@ -2,9 +2,11 @@ package org.to.telegramfinalproject.Server;
 
 import org.json.JSONArray;
 import org.json.JSONObject;
+import org.to.telegramfinalproject.Database.ContactDatabase;
 import org.to.telegramfinalproject.Database.MessageDatabase;
 import org.to.telegramfinalproject.Database.PrivateChatDatabase;
 import org.to.telegramfinalproject.Database.userDatabase;
+import org.to.telegramfinalproject.Models.ContactEntry;
 import org.to.telegramfinalproject.Models.Message;
 import org.to.telegramfinalproject.Models.ResponseModel;
 import org.to.telegramfinalproject.Models.User;
@@ -12,6 +14,7 @@ import org.to.telegramfinalproject.Models.User;
 import java.time.Instant;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
 import java.util.UUID;
@@ -158,6 +161,56 @@ public class SidebarService {
         }
     }
 
+    // Search in user's contact list
+    public static ResponseModel handleSearchContacts(String userUUID, String searchTerm) {
+        if (searchTerm == null || searchTerm.trim().isEmpty()) {
+            return new ResponseModel("error", "Search term cannot be empty.");
+        }
+
+        List<ContactEntry> searchResult = ContactDatabase.searchContacts(UUID.fromString(userUUID), searchTerm);
+
+        if (searchResult.isEmpty()) {
+            return new ResponseModel("error", "No contacts found.");
+        }
+
+        JSONObject data = new JSONObject();
+        JSONArray contacts = new JSONArray();
+
+        for (ContactEntry entry : searchResult) {
+            contacts.put(new JSONObject()
+                    .put("contact_id", entry.getContactId())
+                    .put("user_id", entry.getUserId())
+                    .put("contact_display_id", entry.getContact_displayId())
+                    .put("profile_name", entry.getProfileName())
+                    .put("image_url", entry.getImageUrl())
+                    .put("is_blocked", entry.isBlocked())
+                    .put("last_seen", entry.getLastSeenTime())
+            );
+        }
+        data.put("contacts", contacts);
+
+        if (searchResult.isEmpty()) {
+            return new ResponseModel("error", "No contacts found.");
+        }
+
+        return new ResponseModel("success", "Search contacts successfully.", data);
+    }
+
+    // Remove a contact in user's contact list
+    public static ResponseModel handleRemoveContact(UUID userUUID, UUID contactId) {
+        if (userUUID == null || contactId == null) {
+            return new ResponseModel("error", "Invalid input.");
+        }
+
+        boolean removed = ContactDatabase.removeContact(userUUID, contactId);
+
+        if (removed) {
+            return new ResponseModel("success", "Contact removed successfully.");
+        } else {
+            return new ResponseModel("error", "Contact not found.");
+        }
+    }
+
     // Get saved messages data
     public static ResponseModel handleGetSavedMessages(UUID userId) {
         try {