Station alert levels (#8226)

Content.Server/AlertLevel/AlertLevelComponent.cs

@@ -0,0 +1,46 @@
+namespace Content.Server.AlertLevel;
+
+/// <summary>
+/// Alert level component. This is the component given to a station to
+/// signify its alert level state.
+/// </summary>
+[RegisterComponent]
+public sealed class AlertLevelComponent : Component
+{
+    /// <summary>
+    /// The current set of alert levels on the station.
+    /// </summary>
+    [ViewVariables]
+    public AlertLevelPrototype? AlertLevels;
+
+    // Once stations are a prototype, this should be used.
+    [DataField("alertLevelPrototype")]
+    public string AlertLevelPrototype = default!;
+
+    /// <summary>
+    /// The current level on the station.
+    /// </summary>
+    [ViewVariables(VVAccess.ReadWrite)] public string CurrentLevel = string.Empty;
+
+    [ViewVariables] public const float Delay = 300;
+    [ViewVariables] public float CurrentDelay = 0;
+    [ViewVariables] public bool ActiveDelay;
+
+    /// <summary>
+    /// If the level can be selected on the station.
+    /// </summary>
+    [ViewVariables]
+    public bool IsSelectable
+    {
+        get
+        {
+            if (AlertLevels == null
+                || !AlertLevels.Levels.TryGetValue(CurrentLevel, out var level))
+            {
+                return false;
+            }
+
+            return level.Selectable && !level.DisableSelection;
+        }
+    }
+}