Add inventory count conditions and item removal actions

src/ItemRemoveAction.cs

@@ -0,0 +1,26 @@
+namespace Cthangover.Mods.Items
+{
+    using Cthangover.Core.Actions;
+
+    /// <summary>Consumes a positive stack from a scenario. Gate deliveries with item('id') >= count before running it.</summary>
+    public class ItemRemoveAction : IScenarioAction
+    {
+        /// <summary>Scenario id.</summary>
+        public string Name => "item.remove";
+
+        /// <summary>Refuses an invalid or insufficient stack without changing inventory.</summary>
+        public void Run(IActionContext ctx)
+        {
+            var id = ctx.GetParam("id")?.Trim();
+            var text = ctx.GetParam("count");
+            var count = 1;
+            if (string.IsNullOrWhiteSpace(id) || (!string.IsNullOrWhiteSpace(text) && !int.TryParse(text, out count)) || count <= 0)
+            {
+                ctx.LogWarning("INVENTORY", "item.remove: expected an item id and a positive count");
+                return;
+            }
+            if (ctx.Inventory?.Remove(id, count) != true)
+                ctx.LogWarning("INVENTORY", $"item.remove: insufficient '{id}' (need {count})");
+        }
+    }
+}