add chatserver & client

Project/ChatMessage.cs

@@ -0,0 +1,76 @@
+using System;
+
+namespace Project
+{
+    /// <summary>
+    /// Chat message type
+    /// </summary>
+    public enum MessageType
+    {
+        /// <summary>Client connect</summary>
+        Connect = 0,
+        /// <summary>Client disconnect</summary>
+        Disconnect = 1,
+        /// <summary>Normal chat message</summary>
+        Chat = 2,
+        /// <summary>Server notice</summary>
+        Notice = 3,
+        /// <summary>Whisper message</summary>
+        Whisper = 4,
+        /// <summary>User list request</summary>
+        UserListRequest = 5,
+        /// <summary>User list response</summary>
+        UserListResponse = 6,
+        /// <summary>Ping (keep alive)</summary>
+        Ping = 7,
+        /// <summary>Pong (ping response)</summary>
+        Pong = 8
+    }
+
+    /// <summary>
+    /// Chat message protocol
+    /// </summary>
+    [Serializable]
+    public class ChatMessage
+    {
+        /// <summary>Message type</summary>
+        public MessageType Type { get; set; }
+
+        /// <summary>Sender nickname</summary>
+        public string NickName { get; set; }
+
+        /// <summary>Sender employee ID (사번)</summary>
+        public string EmployeeId { get; set; }
+
+        /// <summary>Sender IP</summary>
+        public string IpAddress { get; set; }
+
+        /// <summary>Sender hostname</summary>
+        public string HostName { get; set; }
+
+        /// <summary>Message content</summary>
+        public string Content { get; set; }
+
+        /// <summary>Target employee ID (for 1:1 chat)</summary>
+        public string TargetEmployeeId { get; set; }
+
+        /// <summary>Target nickname (for whisper, null for broadcast)</summary>
+        public string TargetNickName { get; set; }
+
+        /// <summary>Send time</summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>User group (for filtering)</summary>
+        public string UserGroup { get; set; }
+
+        public ChatMessage()
+        {
+            Timestamp = DateTime.Now;
+        }
+
+        public override string ToString()
+        {
+            return $"[{Timestamp:HH:mm:ss}] {NickName}: {Content}";
+        }
+    }
+}