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.Shared/Construction/MaterialConstructionGraphStep.cs

@@ -0,0 +1,48 @@
+#nullable enable
+using System.Diagnostics.CodeAnalysis;
+using Content.Shared.GameObjects.Components;
+using Content.Shared.GameObjects.Components.Materials;
+using Content.Shared.Materials;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Localization;
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+
+namespace Content.Shared.Construction
+{
+    public class MaterialConstructionGraphStep : EntityInsertConstructionGraphStep
+    {
+        // TODO: Make this use the material system.
+        // TODO TODO: Make the material system not shit.
+        public StackType Material { get; private set; }
+        public int Amount { get; private set; }
+
+        public override void ExposeData(ObjectSerializer serializer)
+        {
+            base.ExposeData(serializer);
+
+            serializer.DataField(this, x => x.Material, "material", StackType.Metal);
+            serializer.DataField(this, x => x.Amount, "amount", 1);
+        }
+
+        public override void DoExamine(FormattedMessage message, bool inDetailsRange)
+        {
+            message.AddMarkup(Loc.GetString("Next, add [color=yellow]{0}x[/color] [color=cyan]{1}[/color].", Amount, Material));
+        }
+
+        public override bool EntityValid(IEntity entity)
+        {
+            return entity.TryGetComponent(out SharedStackComponent? stack) && stack.StackType.Equals(Material);
+        }
+
+        public bool EntityValid(IEntity entity, [NotNullWhen(true)] out SharedStackComponent? stack)
+        {
+            if(entity.TryGetComponent(out SharedStackComponent? otherStack) && otherStack.StackType.Equals(Material))
+                stack = otherStack;
+            else
+                stack = null;
+
+            return stack != null;
+        }
+    }
+}