air alarm signal ports and other stuff (#18642)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Server/Atmos/Monitor/Components/AirAlarmComponent.cs

@@ -1,7 +1,10 @@
+using Content.Server.DeviceLinking.Components;
 using Content.Shared.Atmos.Monitor;
 using Content.Shared.Atmos.Monitor.Components;
 using Content.Shared.Atmos.Piping.Unary.Components;
+using Content.Shared.DeviceLinking;
 using Robust.Shared.Network;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 
 namespace Content.Server.Atmos.Monitor.Components;
 
@@ -24,4 +27,28 @@ public sealed class AirAlarmComponent : Component
     public HashSet<NetUserId> ActivePlayers = new();
 
     public bool CanSync = true;
+
+    /// <summary>
+    /// Previous alarm state for use with output ports.
+    /// </summary>
+    [DataField("state")]
+    public AtmosAlarmType State = AtmosAlarmType.Normal;
+
+    /// <summary>
+    /// The port that gets set to high while the alarm is in the danger state, and low when not.
+    /// </summary>
+    [DataField("dangerPort", customTypeSerializer: typeof(PrototypeIdSerializer<SourcePortPrototype>))]
+    public string DangerPort = "AirDanger";
+
+    /// <summary>
+    /// The port that gets set to high while the alarm is in the warning state, and low when not.
+    /// </summary>
+    [DataField("warningPort", customTypeSerializer: typeof(PrototypeIdSerializer<SourcePortPrototype>))]
+    public string WarningPort = "AirWarning";
+
+    /// <summary>
+    /// The port that gets set to high while the alarm is in the normal state, and low when not.
+    /// </summary>
+    [DataField("normalPort", customTypeSerializer: typeof(PrototypeIdSerializer<SourcePortPrototype>))]
+    public string NormalPort = "AirNormal";
 }