Initial split of the modules

NadekoBot.Core/Modules/Administration/Common/UserSpamStats.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Concurrent;
+using System.Linq;
+using System.Threading;
+using Discord;
+
+namespace NadekoBot.Modules.Administration.Common
+{
+    public class UserSpamStats : IDisposable
+    {
+        public int Count => timers.Count;
+        public string LastMessage { get; set; }
+
+        private ConcurrentQueue<Timer> timers { get; }
+
+        public UserSpamStats(IUserMessage msg)
+        {
+            LastMessage = msg.Content.ToUpperInvariant();
+            timers = new ConcurrentQueue<Timer>();
+
+            ApplyNextMessage(msg);
+        }
+
+        private readonly object applyLock = new object();
+        public void ApplyNextMessage(IUserMessage message)
+        {
+            lock (applyLock)
+            {
+                var upperMsg = message.Content.ToUpperInvariant();
+                if (upperMsg != LastMessage || (string.IsNullOrWhiteSpace(upperMsg) && message.Attachments.Any()))
+                {
+                    LastMessage = upperMsg;
+                    while (timers.TryDequeue(out var old))
+                        old.Change(Timeout.Infinite, Timeout.Infinite);
+                }
+                var t = new Timer((_) => {
+                    if (timers.TryDequeue(out var old))
+                        old.Change(Timeout.Infinite, Timeout.Infinite);
+                }, null, TimeSpan.FromMinutes(30), TimeSpan.FromMinutes(30));
+                timers.Enqueue(t);
+            }
+        }
+
+        public void Dispose()
+        {
+            while (timers.TryDequeue(out var old))
+                old.Change(Timeout.Infinite, Timeout.Infinite);
+        }
+    }
+}