Re-organize all projects (#4166)

Content.Server/DoAfter/DoAfterSystem.cs

@@ -0,0 +1,82 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.DoAfter
+{
+    [UsedImplicitly]
+    public sealed class DoAfterSystem : EntitySystem
+    {
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            foreach (var comp in ComponentManager.EntityQuery<DoAfterComponent>(true))
+            {
+                var cancelled = new List<DoAfter>(0);
+                var finished = new List<DoAfter>(0);
+
+                foreach (var doAfter in comp.DoAfters.ToArray())
+                {
+                    doAfter.Run(frameTime);
+
+                    switch (doAfter.Status)
+                    {
+                        case DoAfterStatus.Running:
+                            break;
+                        case DoAfterStatus.Cancelled:
+                            cancelled.Add(doAfter);
+                            break;
+                        case DoAfterStatus.Finished:
+                            finished.Add(doAfter);
+                            break;
+                        default:
+                            throw new ArgumentOutOfRangeException();
+                    }
+                }
+
+                foreach (var doAfter in cancelled)
+                {
+                    comp.Cancelled(doAfter);
+                }
+
+                foreach (var doAfter in finished)
+                {
+                    comp.Finished(doAfter);
+                }
+
+                finished.Clear();
+            }
+        }
+
+        /// <summary>
+        ///     Tasks that are delayed until the specified time has passed
+        ///     These can be potentially cancelled by the user moving or when other things happen.
+        /// </summary>
+        /// <param name="eventArgs"></param>
+        /// <returns></returns>
+        public async Task<DoAfterStatus> DoAfter(DoAfterEventArgs eventArgs)
+        {
+            // Setup
+            var doAfter = new DoAfter(eventArgs);
+            // Caller's gonna be responsible for this I guess
+            var doAfterComponent = eventArgs.User.GetComponent<DoAfterComponent>();
+            doAfterComponent.Add(doAfter);
+
+            await doAfter.AsTask;
+
+            return doAfter.Status;
+        }
+    }
+
+    public enum DoAfterStatus
+    {
+        Running,
+        Cancelled,
+        Finished,
+    }
+}