Yet another UserService.cs content detector

DiscordBot/Services/UserService.cs

@@ -41,8 +41,13 @@ public class UserService
 
     private readonly int _thanksCooldownTime;
     private readonly int _thanksMinJoinTime;
-
     private readonly string _thanksRegex;
+
+    private DateTime _mikuMentioned;
+    private readonly TimeSpan _mikuCooldownTime;
+    private readonly string _mikuRegex;
+    private readonly string _mikuReply;
+
     private readonly UpdateService _updateService;
 
     private readonly Dictionary<ulong, DateTime> _xpCooldown;
@@ -106,6 +111,17 @@ Init thanks
         _thanksCooldownTime = userSettings.ThanksCooldown;
         _thanksMinJoinTime = userSettings.ThanksMinJoinTime;
 
+        /*
+        Init Miku
+        Gag feature has no external settings, hardcoded userid refers to Reenaki/Kiki.
+        */
+        _mikuMentioned = DateTime.Now;
+        _mikuCooldownTime = new TimeSpan(0, 39, 0); // 39min
+        //_mikuCooldownTime = new TimeSpan(0, 0, 39); // test 39sec
+        _mikuRegex = @"(?i)\b(miku|hatsune|初音ミク|初音|ミク)\b";
+        _mikuReply = ":three: :nine: Oi, mite, mite, <@358915848515354626> -chan!";
+        //_mikuReply = "Oi, mite, mite, <@427306565184389132> ! :three: :nine:"; // test
+
         /*
          Init Code analysis
         */
@@ -140,6 +156,7 @@ Event subscriptions
         _client.MessageReceived += UpdateXp;
         _client.MessageReceived += Thanks;
         _client.MessageUpdated += ThanksEdited;
+        _client.MessageReceived += MikuCheck;
         _client.MessageReceived += CodeCheck;
         _client.MessageReceived += ScoldForAtEveryoneUsage;
         _client.MessageReceived += AutoCreateThread;
@@ -503,6 +520,30 @@ await messageParam.Channel.SendMessageAsync(
         }
     }
 
+    public async Task MikuCheck(SocketMessage messageParam)
+    {
+        //Get guild id
+        var channel = (SocketGuildChannel)messageParam.Channel;
+        var guildId = channel.Guild.Id;
+
+        //Make sure its in the UDC server
+        if (guildId != _settings.GuildId) return;
+
+        if (messageParam.Author.IsBot)
+            return;
+
+        var now = DateTime.Now;
+        if ((DateTime.Now - _mikuMentioned) < _mikuCooldownTime)
+            return;
+
+        var match = Regex.Match(messageParam.Content, _mikuRegex);
+        if (!match.Success)
+            return;
+
+        _mikuMentioned = now;
+        await messageParam.Channel.SendMessageAsync(_mikuReply);
+    }
+
     public async Task CodeCheck(SocketMessage messageParam)
     {
         // Don't correct a Bot, don't correct in off-topic