Use Delay Component (#540)

* use delay timer

* remove accidental using

* and remove accidental newline because i don't proofread my code

* compatibility with HUD cooldown
suggested changes

* get out of here

* suggested changes

* change to seconds from milliseconds

* remove redundancy

Content.Server/GameObjects/Components/Timing/UseDelayComponent.cs

@@ -0,0 +1,79 @@
+using System;
+using CancellationTokenSource = System.Threading.CancellationTokenSource;
+using Content.Shared.GameObjects.Components.Items;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.Timers;
+using Robust.Shared.IoC;
+using Robust.Shared.Interfaces.Timing;
+
+namespace Content.Server.GameObjects.Components.Timing
+{
+    /// <summary>
+    /// Timer that creates a cooldown each time an object is activated/used
+    /// </summary>
+    [RegisterComponent]
+    public class UseDelayComponent : Component
+    {
+        public override string Name => "UseDelay";
+
+        private TimeSpan _lastUseTime;
+
+        private float _delay;
+        /// <summary>
+        /// The time, in seconds, between an object's use and when it can be used again
+        /// </summary>
+        public float Delay { get => _delay; set => _delay = value; }
+
+        public bool ActiveDelay{ get; private set; }
+
+        private CancellationTokenSource cancellationTokenSource;
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+            serializer.DataField(ref _delay, "delay", 1);
+        }
+
+        public void BeginDelay()
+        {
+            if (ActiveDelay)
+            {
+                return;
+            }
+
+            ActiveDelay = true;
+
+            cancellationTokenSource = new CancellationTokenSource();
+
+            Timer.Spawn(TimeSpan.FromSeconds(Delay), () => ActiveDelay = false, cancellationTokenSource.Token);
+
+            _lastUseTime = IoCManager.Resolve<IGameTiming>().CurTime;
+
+            if (Owner.TryGetComponent(out ItemCooldownComponent cooldown))
+            {
+                cooldown.CooldownStart = _lastUseTime;
+                cooldown.CooldownEnd = _lastUseTime + TimeSpan.FromSeconds(Delay);
+            }
+
+        }
+
+        public void Cancel()
+        {
+            cancellationTokenSource.Cancel();
+            ActiveDelay = false;
+
+            if (Owner.TryGetComponent(out ItemCooldownComponent cooldown))
+            {
+                cooldown.CooldownEnd = IoCManager.Resolve<IGameTiming>().CurTime;
+            }
+        }
+
+        public void Restart()
+        {
+            cancellationTokenSource.Cancel();
+            ActiveDelay = false;
+            BeginDelay();
+        }
+    }
+}