Check for enough inventory slots

Questionable/Controller/ContextMenuController.cs

@@ -108,6 +108,8 @@ internal sealed class ContextMenuController : IDisposable
             lockedReasonn = $"{classJob} not unlocked";
         else if (quantityToGather == 0)
             lockedReasonn = "No allowances";
+        else if (quantityToGather > _gameFunctions.GetFreeInventorySlots())
+            lockedReasonn = "Inventory full";
         else if (_gameFunctions.IsOccupied())
             lockedReasonn = "Can't be used while interacting";
 

Questionable/Controller/Steps/Gathering/DoGather.cs

@@ -4,12 +4,14 @@ using Dalamud.Game.ClientState.Conditions;
 using Dalamud.Plugin.Services;
 using FFXIVClientStructs.FFXIV.Component.GUI;
 using LLib.GameUI;
+using Questionable.Functions;
 using Questionable.Model.Gathering;
 
 namespace Questionable.Controller.Steps.Gathering;
 
 internal sealed class DoGather(
     GatheringController gatheringController,
+    GameFunctions gameFunctions,
     IGameGui gameGui,
     ICondition condition) : ITask
 {
@@ -33,6 +35,9 @@ internal sealed class DoGather(
         if (gatheringController.HasNodeDisappeared(_currentNode))
             return ETaskResult.TaskComplete;
 
+        if (gameFunctions.GetFreeInventorySlots() == 0)
+            throw new TaskException("Inventory full");
+
         if (condition[ConditionFlag.Gathering])
         {
             if (gameGui.TryGetAddonByName("GatheringMasterpiece", out AtkUnitBase* _))

Questionable/Controller/Steps/Gathering/DoGatherCollectable.cs

@@ -52,6 +52,9 @@ internal sealed class DoGatherCollectable(
             }
         }
 
+        if (gameFunctions.GetFreeInventorySlots() == 0)
+            throw new TaskException("Inventory full");
+
         NodeCondition? nodeCondition = GetNodeCondition();
         if (nodeCondition == null)
             return ETaskResult.TaskComplete;

Questionable/Functions/GameFunctions.cs

@@ -477,4 +477,30 @@ internal sealed unsafe class GameFunctions
                LAddon.IsAddonReady(fade) &&
                fade->IsVisible;
     }
+
+    public int GetFreeInventorySlots()
+    {
+        InventoryManager* inventoryManager = InventoryManager.Instance();
+        if (inventoryManager == null)
+            return 0;
+
+        int slots = 0;
+        for (InventoryType inventoryType = InventoryType.Inventory1;
+             inventoryType <= InventoryType.Inventory4;
+             ++inventoryType)
+        {
+            InventoryContainer* inventoryContainer = inventoryManager->GetInventoryContainer(inventoryType);
+            if (inventoryContainer == null)
+                continue;
+
+            for (int i = 0; i < inventoryContainer->Size; ++i)
+            {
+                InventoryItem* item = inventoryContainer->GetInventorySlot(i);
+                if (item == null || item->ItemId == 0)
+                    ++slots;
+            }
+        }
+
+        return slots;
+    }
 }