GameRuleOnTrigger (#39845)

* Gaming

* commit

---------

Co-authored-by: iaada <iaada@users.noreply.github.com>

Content.Server/Trigger/Systems/GameRuleTriggerSystem.cs

@@ -0,0 +1,44 @@
+using Content.Server.Administration.Logs;
+using Content.Server.GameTicking;
+using Content.Shared.Database;
+using Content.Shared.Trigger;
+using Content.Shared.Trigger.Components.Effects;
+
+namespace Content.Server.Trigger.Systems;
+
+/// <summary>
+/// Trigger system for game rules.
+/// </summary>
+public sealed class GameRuleTriggerSystem : EntitySystem
+{
+    [Dependency] private readonly GameTicker _ticker = default!;
+    [Dependency] private readonly IAdminLogManager _adminLogger = default!;
+
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<AddGameRuleOnTriggerComponent, TriggerEvent>(AddRuleOnTrigger);
+    }
+
+    private void AddRuleOnTrigger(Entity<AddGameRuleOnTriggerComponent> ent, ref TriggerEvent args)
+    {
+        if (args.Key != null && !ent.Comp.KeysIn.Contains(args.Key))
+            return;
+
+        var rule = _ticker.AddGameRule(ent.Comp.GameRule);
+
+        _adminLogger.Add(LogType.EventStarted,
+            $"{ToPrettyString(args.User):entity} added a game rule [{ent.Comp.GameRule}]" +
+            $" via a trigger on {ToPrettyString(ent.Owner):entity}.");
+
+        if (ent.Comp.StartRule && _ticker.RunLevel == GameRunLevel.InRound)
+        {
+            _ticker.StartGameRule(rule);
+            _adminLogger.Add(LogType.EventStarted, $"{ToPrettyString(args.User):entity} started game rule [{ent.Comp.GameRule}].");
+        }
+
+        args.Handled = true;
+    }
+}

Content.Shared/Trigger/Components/Effects/AddGameRuleOnTriggerComponent.cs

@@ -0,0 +1,26 @@
+using Content.Shared.GameTicking.Components;
+using Robust.Shared.GameStates;
+using Robust.Shared.Prototypes;
+
+namespace Content.Shared.Trigger.Components.Effects;
+
+/// <summary>
+/// Adds and starts a new game rule on a trigger.
+/// The user is always logged alongside the game rule and this entity.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+public sealed partial class AddGameRuleOnTriggerComponent : BaseXOnTriggerComponent
+{
+    /// <summary>
+    /// The game rule that will be added. Entity requires <see cref="GameRuleComponent"/>.
+    /// </summary>
+    [DataField(required: true), AutoNetworkedField]
+    public EntProtoId<GameRuleComponent> GameRule;
+
+    /// <summary>
+    /// Whether to also start the game rule when adding it.
+    /// You almost always want this to be true.
+    /// </summary>
+    [DataField, AutoNetworkedField]
+    public bool StartRule = true;
+}