Multiantag Gamemode (#37783)

Co-authored-by: slarticodefast <161409025+slarticodefast@users.noreply.github.com>
Co-authored-by: Southbridge <7013162+southbridge-fur@users.noreply.github.com>
Co-authored-by: ScarKy0 <106310278+ScarKy0@users.noreply.github.com>

Content.Shared/EntityTable/Conditions/HasBudgetCondition.cs

@@ -0,0 +1,51 @@
+using Content.Shared.EntityTable.EntitySelectors;
+using Content.Shared.GameTicking.Rules;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.EntityTable.Conditions;
+
+/// <summary>
+/// Condition that only succeeds if a table supplies a sufficient "cost" to a given
+/// </summary>
+public sealed partial class HasBudgetCondition : EntityTableCondition
+{
+    public const string BudgetContextKey = "Budget";
+
+    /// <summary>
+    /// Used for determining the cost for the budget.
+    /// If null, attempts to fetch the cost from the attached selector.
+    /// </summary>
+    [DataField]
+    public int? CostOverride;
+
+    protected override bool EvaluateImplementation(EntityTableSelector root,
+        IEntityManager entMan,
+        IPrototypeManager proto,
+        EntityTableContext ctx)
+    {
+        if (!ctx.TryGetData<float>(BudgetContextKey, out var budget))
+            return false;
+
+        int cost;
+        if (CostOverride != null)
+        {
+            cost = CostOverride.Value;
+        }
+        else
+        {
+            if (root is not EntSelector entSelector)
+                return false;
+
+            if (!proto.Index(entSelector.Id).TryGetComponent(out DynamicRuleCostComponent? costComponent, entMan.ComponentFactory))
+            {
+                var log = Logger.GetSawmill("HasBudgetCondition");
+                log.Error($"Rule {entSelector.Id} does not have a DynamicRuleCostComponent.");
+                return false;
+            }
+
+            cost = costComponent.Cost;
+        }
+
+        return budget >= cost;
+    }
+}