Xenoarchaeology artifacts (#6069)

Co-authored-by: Alexander Evgrashin <evgrashin.adl@gmail.com>

Content.Server/Xenoarchaeology/XenoArtifacts/Triggers/Components/ArtifactGasTriggerComponent.cs

@@ -0,0 +1,41 @@
+using Content.Shared.Atmos;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.Xenoarchaeology.XenoArtifacts.Triggers.Components;
+
+/// <summary>
+///     Activates artifact when it surrounded by certain gas.
+/// </summary>
+[RegisterComponent]
+public class ArtifactGasTriggerComponent : Component
+{
+    public override string Name => "ArtifactGasTrigger";
+
+    /// <summary>
+    ///     List of possible activation gases to pick on startup.
+    /// </summary>
+    [DataField("possibleGas")]
+    public Gas[] PossibleGases =
+    {
+        Gas.Oxygen,
+        Gas.Plasma,
+        Gas.Nitrogen,
+        Gas.CarbonDioxide
+    };
+
+    /// <summary>
+    ///     Gas id that will activate artifact.
+    /// </summary>
+    [DataField("gas")]
+    [ViewVariables(VVAccess.ReadWrite)]
+    public Gas? ActivationGas;
+
+    /// <summary>
+    ///     How many moles of gas should be present in room to activate artifact.
+    /// </summary>
+    [DataField("moles")]
+    [ViewVariables(VVAccess.ReadWrite)]
+    public float ActivationMoles = Atmospherics.MolesCellStandard * 0.1f;
+}