Adds fire/air alarms (#5018)

Co-authored-by: Vera Aguilera Puerto <6766154+Zumorica@users.noreply.github.com>
Co-authored-by: E F R <602406+Efruit@users.noreply.github.com>
Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/Atmos/Monitor/Systems/FireAlarmSystem.cs

@@ -0,0 +1,42 @@
+using Content.Server.Atmos.Monitor.Components;
+using Content.Server.Power.Components;
+using Content.Shared.Atmos.Monitor;
+using Content.Shared.Interaction;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Server.Atmos.Monitor.Systems
+{
+    public class FireAlarmSystem : EntitySystem
+    {
+        [Dependency] private readonly AtmosMonitorSystem _monitorSystem = default!;
+        [Dependency] private readonly SharedInteractionSystem _interactionSystem = default!;
+
+        public override void Initialize()
+        {
+            SubscribeLocalEvent<FireAlarmComponent, InteractHandEvent>(OnInteractHand);
+        }
+
+        private void OnInteractHand(EntityUid uid, FireAlarmComponent component, InteractHandEvent args)
+        {
+            if (!_interactionSystem.InRangeUnobstructed(args.User, args.Target))
+                return;
+
+            if (EntityManager.TryGetComponent(args.User, out ActorComponent? actor)
+                && EntityManager.TryGetComponent(uid, out AtmosMonitorComponent? monitor)
+                && EntityManager.TryGetComponent(uid, out ApcPowerReceiverComponent? power)
+                && power.Powered)
+            {
+                if (monitor.HighestAlarmInNetwork == AtmosMonitorAlarmType.Normal)
+                {
+                    _monitorSystem.Alert(uid, AtmosMonitorAlarmType.Danger);
+                }
+                else
+                {
+                    _monitorSystem.ResetAll(uid);
+                }
+            }
+        }
+    }
+}