Data-oriented Construction System (#2152)

- Powerful
- Data-oriented
- Approved by PJB
- Powered by node graphs and AI pathfinding
- Coded by the same nerd who brought you atmos

Co-authored-by: Exp <theexp111@gmail.com>

Content.Server/Construction/Conditions/ContainerEmpty.cs

@@ -0,0 +1,41 @@
+#nullable enable
+using System.Threading.Tasks;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Server.GameObjects.Components.Container;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+
+namespace Content.Server.Construction.Conditions
+{
+    [UsedImplicitly]
+    public class ContainerEmpty : IEdgeCondition
+    {
+        public string Container { get; private set; } = string.Empty;
+        public string Text { get; private set; } = string.Empty;
+
+        public void ExposeData(ObjectSerializer serializer)
+        {
+            serializer.DataField(this, x => x.Container, "container", string.Empty);
+            serializer.DataField(this, x => x.Text, "text", string.Empty);
+        }
+
+        public async Task<bool> Condition(IEntity entity)
+        {
+            if (!entity.TryGetComponent(out ContainerManagerComponent? containerManager) ||
+                !containerManager.TryGetContainer(Container, out var container)) return true;
+
+            return container.ContainedEntities.Count == 0;
+        }
+
+        public void DoExamine(IEntity entity, FormattedMessage message, bool inDetailsRange)
+        {
+            if (!entity.TryGetComponent(out ContainerManagerComponent? containerManager) ||
+                !containerManager.TryGetContainer(Container, out var container)) return;
+
+            if (container.ContainedEntities.Count != 0)
+                message.AddMarkup(Text);
+        }
+    }
+}