Add core gameplay systems and data assets for player mechanics

- Implemented DA_EquipmentConfig for managing equipment resistances, durability, and weight.
- Created DA_ItemData to serve as a base item data asset with various item types and properties.
- Introduced BPC_HealthSystem for managing player health and death events.
- Added BPC_MovementStateSystem to handle player movement modes with event delegation.
- Developed BPC_StaminaSystem to track player stamina and exhaustion states.
- Established BPC_StateManager as a central authority for managing player action states and gating.
- Created BPC_StressSystem to monitor and respond to player stress levels.
- Implemented PC_CoreController and PS_CorePlayerState for player controller and state management.
- Developed SS_SaveManager for save/load functionality with slot management and serialization.
- Introduced DA_StateGatingTable for defining action gating rules based on gameplay tags.
- Added BPC_DamageReceptionSystem to process incoming damage and apply resistance calculations.
- Implemented BPC_HitReactionSystem for managing hit reactions based on damage received.
- Created BPC_ShieldDefenseSystem to manage shield health and blocking mechanics.
- Added PG_FrameworkEditor.Target.cs for editor build configuration.

Source/PG_Framework/Private/Inventory/BPC_InventorySystem.cpp

@@ -0,0 +1,425 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+// UE5 Modular Game Framework — BPC_InventorySystem Implementation
+
+#include "Inventory/BPC_InventorySystem.h"
+#include "Inventory/DA_ItemData.h"
+#include "Algo/Sort.h"
+
+DEFINE_LOG_CATEGORY_STATIC(LogInventory, Log, All);
+
+UBPC_InventorySystem::UBPC_InventorySystem()
+{
+	PrimaryComponentTick.bCanEverTick = false;
+
+	GridWidth = 8;
+	GridHeight = 5;
+	MaxWeight = 50.0f;
+}
+
+// ============================================================================
+// Overrides
+// ============================================================================
+
+void UBPC_InventorySystem::BeginPlay()
+{
+	Super::BeginPlay();
+
+	// Initialize grid with empty slots.
+	const int32 TotalSlots = GridWidth * GridHeight;
+	Slots.SetNum(TotalSlots);
+
+	for (int32 i = 0; i < TotalSlots; ++i)
+	{
+		Slots[i].GridX = i % GridWidth;
+		Slots[i].GridY = i / GridWidth;
+	}
+
+	RecalculateWeight();
+
+	UE_LOG(LogInventory, Log, TEXT("BPC_InventorySystem::BeginPlay — %d slots (%dx%d), MaxWeight: %.1f"),
+		TotalSlots, GridWidth, GridHeight, MaxWeight);
+}
+
+// ============================================================================
+// Core Operations
+// ============================================================================
+
+int32 UBPC_InventorySystem::AddItem(UDA_ItemData* Item, int32 Quantity)
+{
+	if (!Item || Quantity <= 0)
+	{
+		return 0;
+	}
+
+	if (!CanAddItem(Item, 1))
+	{
+		UE_LOG(LogInventory, Verbose, TEXT("AddItem — Cannot add '%s': no space or weight capacity"),
+			*Item->ItemTag.GetTagName().ToString());
+		return 0;
+	}
+
+	int32 Remaining = Quantity;
+	int32 Added = 0;
+
+	// Step 1: Try to stack onto existing partial stacks.
+	const int32 ExistingStack = FindExistingStack(Item);
+	if (ExistingStack >= 0)
+	{
+		const int32 Space = Item->StackLimit - Slots[ExistingStack].Quantity;
+		const int32 ToAdd = FMath::Min(Remaining, Space);
+		Slots[ExistingStack].Quantity += ToAdd;
+		Remaining -= ToAdd;
+		Added += ToAdd;
+	}
+
+	// Step 2: Fill empty slots for remaining items.
+	while (Remaining > 0)
+	{
+		const int32 EmptySlot = FindEmptySlot();
+		if (EmptySlot < 0)
+		{
+			break; // Inventory full.
+		}
+
+		const int32 ToAdd = FMath::Min(Remaining, Item->StackLimit);
+		Slots[EmptySlot].Item = Item;
+		Slots[EmptySlot].Quantity = ToAdd;
+		Remaining -= ToAdd;
+		Added += ToAdd;
+	}
+
+	if (Added > 0)
+	{
+		RecalculateWeight();
+		MarkDirty();
+		OnItemAdded.Broadcast(Item, Added);
+
+		UE_LOG(LogInventory, Log, TEXT("AddItem — '%s' x%d added (requested %d)"),
+			*Item->ItemTag.GetTagName().ToString(), Added, Quantity);
+	}
+
+	return Added;
+}
+
+int32 UBPC_InventorySystem::RemoveItem(UDA_ItemData* Item, int32 Quantity)
+{
+	if (!Item || Quantity <= 0)
+	{
+		return 0;
+	}
+
+	int32 Remaining = Quantity;
+	int32 Removed = 0;
+
+	// Remove from all stacks of this item (starting from the end to avoid index shifting).
+	for (int32 i = Slots.Num() - 1; i >= 0 && Remaining > 0; --i)
+	{
+		if (Slots[i].Item == Item)
+		{
+			const int32 ToRemove = FMath::Min(Remaining, Slots[i].Quantity);
+			Slots[i].Quantity -= ToRemove;
+			Remaining -= ToRemove;
+			Removed += ToRemove;
+
+			if (Slots[i].Quantity <= 0)
+			{
+				Slots[i].Clear();
+			}
+		}
+	}
+
+	if (Removed > 0)
+	{
+		RecalculateWeight();
+		MarkDirty();
+		OnItemRemoved.Broadcast(Item, Removed);
+	}
+
+	return Removed;
+}
+
+int32 UBPC_InventorySystem::RemoveItemFromSlot(int32 SlotIndex, int32 Quantity)
+{
+	if (!Slots.IsValidIndex(SlotIndex) || Slots[SlotIndex].IsEmpty() || Quantity <= 0)
+	{
+		return 0;
+	}
+
+	UDA_ItemData* Item = Slots[SlotIndex].Item;
+	const int32 ToRemove = FMath::Min(Quantity, Slots[SlotIndex].Quantity);
+	Slots[SlotIndex].Quantity -= ToRemove;
+
+	if (Slots[SlotIndex].Quantity <= 0)
+	{
+		Slots[SlotIndex].Clear();
+	}
+
+	RecalculateWeight();
+	MarkDirty();
+	OnItemRemoved.Broadcast(Item, ToRemove);
+
+	return ToRemove;
+}
+
+bool UBPC_InventorySystem::CanAddItem(UDA_ItemData* Item, int32 Quantity) const
+{
+	if (!Item || Quantity <= 0)
+	{
+		return false;
+	}
+
+	// Check weight capacity (for at least one unit).
+	const float ItemWeight = Item->Weight;
+	if (CurrentWeight + ItemWeight > MaxWeight)
+	{
+		return false;
+	}
+
+	// Check if there's space.
+	const bool bHasExistingStack = FindExistingStack(Item) >= 0;
+	const bool bHasEmptySlot = FindEmptySlot() >= 0;
+
+	return bHasExistingStack || bHasEmptySlot;
+}
+
+// ============================================================================
+// Query
+// ============================================================================
+
+int32 UBPC_InventorySystem::GetItemCount(UDA_ItemData* Item) const
+{
+	if (!Item)
+	{
+		return 0;
+	}
+
+	int32 Count = 0;
+	for (const FInventorySlot& Slot : Slots)
+	{
+		if (Slot.Item == Item)
+		{
+			Count += Slot.Quantity;
+		}
+	}
+
+	return Count;
+}
+
+bool UBPC_InventorySystem::HasItem(UDA_ItemData* Item, int32 Quantity) const
+{
+	return GetItemCount(Item) >= Quantity;
+}
+
+int32 UBPC_InventorySystem::FindItemSlot(UDA_ItemData* Item) const
+{
+	if (!Item)
+	{
+		return -1;
+	}
+
+	for (int32 i = 0; i < Slots.Num(); ++i)
+	{
+		if (Slots[i].Item == Item)
+		{
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+TArray<UDA_ItemData*> UBPC_InventorySystem::GetAllItems() const
+{
+	TSet<UDA_ItemData*> UniqueItems;
+
+	for (const FInventorySlot& Slot : Slots)
+	{
+		if (!Slot.IsEmpty())
+		{
+			UniqueItems.Add(Slot.Item);
+		}
+	}
+
+	return UniqueItems.Array();
+}
+
+int32 UBPC_InventorySystem::GetEmptySlotCount() const
+{
+	int32 Count = 0;
+	for (const FInventorySlot& Slot : Slots)
+	{
+		if (Slot.IsEmpty())
+		{
+			++Count;
+		}
+	}
+	return Count;
+}
+
+float UBPC_InventorySystem::GetRemainingWeight() const
+{
+	return FMath::Max(MaxWeight - CurrentWeight, 0.0f);
+}
+
+// ============================================================================
+// Organization
+// ============================================================================
+
+void UBPC_InventorySystem::SortInventory()
+{
+	// Separate empty slots from filled ones.
+	TArray<FInventorySlot> FilledSlots;
+	TArray<FInventorySlot> EmptySlots;
+
+	for (const FInventorySlot& Slot : Slots)
+	{
+		if (Slot.IsEmpty())
+		{
+			EmptySlots.Add(Slot);
+		}
+		else
+		{
+			FilledSlots.Add(Slot);
+		}
+	}
+
+	// Sort filled slots by ItemType, then DisplayName.
+	Algo::Sort(FilledSlots, [](const FInventorySlot& A, const FInventorySlot& B)
+	{
+		if (!A.Item || !B.Item) return A.Item != nullptr;
+
+		if (A.Item->ItemType != B.Item->ItemType)
+		{
+			return static_cast<uint8>(A.Item->ItemType) < static_cast<uint8>(B.Item->ItemType);
+		}
+
+		return A.Item->DisplayName.ToString() < B.Item->DisplayName.ToString();
+	});
+
+	// Rebuild slots array: sorted filled + empties.
+	Slots.Empty();
+	Slots.Append(FilledSlots);
+	Slots.Append(EmptySlots);
+
+	// Update grid positions.
+	for (int32 i = 0; i < Slots.Num(); ++i)
+	{
+		Slots[i].GridX = i % GridWidth;
+		Slots[i].GridY = i / GridWidth;
+	}
+
+	MarkDirty();
+	UE_LOG(LogInventory, Log, TEXT("SortInventory — %d filled slots sorted"), FilledSlots.Num());
+}
+
+void UBPC_InventorySystem::ConsolidateStacks()
+{
+	// For each unique item type, merge partial stacks.
+	TArray<UDA_ItemData*> Items = GetAllItems();
+
+	for (UDA_ItemData* Item : Items)
+	{
+		if (!Item || Item->StackLimit <= 1)
+		{
+			continue;
+		}
+
+		// Gather all slots of this item.
+		TArray<int32> SlotsWithItem;
+		int32 TotalQuantity = 0;
+
+		for (int32 i = 0; i < Slots.Num(); ++i)
+		{
+			if (Slots[i].Item == Item && Slots[i].Quantity < Item->StackLimit)
+			{
+				SlotsWithItem.Add(i);
+				TotalQuantity += Slots[i].Quantity;
+			}
+		}
+
+		if (SlotsWithItem.Num() <= 1)
+		{
+			continue; // Nothing to consolidate.
+		}
+
+		// Clear all partial stacks.
+		for (int32 SlotIdx : SlotsWithItem)
+		{
+			Slots[SlotIdx].Clear();
+		}
+
+		// Re-add as consolidated stacks.
+		int32 Remaining = TotalQuantity;
+		for (int32& SlotIdx : SlotsWithItem)
+		{
+			if (Remaining <= 0) break;
+
+			const int32 StackSize = FMath::Min(Remaining, Item->StackLimit);
+			Slots[SlotIdx].Item = Item;
+			Slots[SlotIdx].Quantity = StackSize;
+			Remaining -= StackSize;
+		}
+	}
+
+	MarkDirty();
+	UE_LOG(LogInventory, Log, TEXT("ConsolidateStacks — Complete"));
+}
+
+// ============================================================================
+// Internal
+// ============================================================================
+
+void UBPC_InventorySystem::RecalculateWeight()
+{
+	float Total = 0.0f;
+	for (const FInventorySlot& Slot : Slots)
+	{
+		if (!Slot.IsEmpty() && Slot.Item)
+		{
+			Total += Slot.Item->Weight * Slot.Quantity;
+		}
+	}
+
+	if (!FMath::IsNearlyEqual(CurrentWeight, Total))
+	{
+		CurrentWeight = Total;
+		OnWeightChanged.Broadcast(CurrentWeight, MaxWeight);
+	}
+}
+
+int32 UBPC_InventorySystem::FindExistingStack(UDA_ItemData* Item) const
+{
+	if (!Item)
+	{
+		return -1;
+	}
+
+	for (int32 i = 0; i < Slots.Num(); ++i)
+	{
+		if (Slots[i].Item == Item && Slots[i].Quantity < Item->StackLimit)
+		{
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+int32 UBPC_InventorySystem::FindEmptySlot() const
+{
+	for (int32 i = 0; i < Slots.Num(); ++i)
+	{
+		if (Slots[i].IsEmpty())
+		{
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+void UBPC_InventorySystem::MarkDirty()
+{
+	bDirty = true;
+	OnInventoryChanged.Broadcast();
+}

Source/PG_Framework/Private/Inventory/DA_EquipmentConfig.cpp

@@ -0,0 +1,13 @@
+#include "Inventory/DA_EquipmentConfig.h"
+
+float UDA_EquipmentConfig::GetResistance(FGameplayTag DamageType) const
+{
+	for (const FDamageTypeResistance& Entry : DamageTypeResistances)
+	{
+		if (Entry.DamageType == DamageType)
+		{
+			return Entry.Resistance;
+		}
+	}
+	return 0.0f;
+}

Source/PG_Framework/Private/Inventory/DA_ItemData.cpp

@@ -0,0 +1,121 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+// UE5 Modular Game Framework — DA_ItemData Implementation
+
+#include "Inventory/DA_ItemData.h"
+#include "GameplayTagsManager.h"
+
+DEFINE_LOG_CATEGORY_STATIC(LogItemData, Log, All);
+
+UDA_ItemData::UDA_ItemData()
+{
+	ItemType = EItemType::Misc;
+	StackLimit = 1;
+	Weight = 0.0f;
+	bCanBeDropped = true;
+	bIsKeyItem = false;
+	bHasInspectMode = false;
+}
+
+// ============================================================================
+// Overrides
+// ============================================================================
+
+void UDA_ItemData::PostLoad()
+{
+	Super::PostLoad();
+
+	// Key items cannot be dropped — enforce.
+	if (bIsKeyItem && bCanBeDropped)
+	{
+		UE_LOG(LogItemData, Warning, TEXT("DA_ItemData::PostLoad — '%s': bIsKeyItem && bCanBeDropped — forcing bCanBeDropped = false"),
+			*ItemTag.GetTagName().ToString());
+		bCanBeDropped = false;
+	}
+
+	// Validate tag registration.
+	if (ItemTag.IsValid())
+	{
+		UGameplayTagsManager& TagManager = UGameplayTagsManager::Get();
+		FGameplayTag CheckTag = TagManager.RequestGameplayTag(ItemTag.GetTagName(), false);
+		if (!CheckTag.IsValid())
+		{
+			UE_LOG(LogItemData, Warning, TEXT("DA_ItemData::PostLoad — '%s': ItemTag '%s' is not registered in the tag table!"),
+				*GetName(), *ItemTag.GetTagName().ToString());
+		}
+	}
+}
+
+#if WITH_EDITOR
+void UDA_ItemData::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
+{
+	Super::PostEditChangeProperty(PropertyChangedEvent);
+
+	FName PropertyName = PropertyChangedEvent.GetPropertyName();
+
+	// Auto-enforce key item rule.
+	if (PropertyName == GET_MEMBER_NAME_CHECKED(UDA_ItemData, bIsKeyItem) && bIsKeyItem)
+	{
+		bCanBeDropped = false;
+	}
+}
+
+bool UDA_ItemData::ValidateItemData(FString& OutErrors) const
+{
+	TArray<FString> Errors;
+
+	// Check required fields.
+	if (!ItemTag.IsValid())
+	{
+		Errors.Add(TEXT("ItemTag is invalid/empty."));
+	}
+
+	if (DisplayName.IsEmpty())
+	{
+		Errors.Add(TEXT("DisplayName is empty."));
+	}
+
+	if (Description.IsEmpty())
+	{
+		Errors.Add(TEXT("Description is empty."));
+	}
+
+	// Check key item cannot be dropped.
+	if (bIsKeyItem && bCanBeDropped)
+	{
+		Errors.Add(TEXT("bIsKeyItem is true but bCanBeDropped is also true. Key items cannot be dropped."));
+	}
+
+	// Check consumable has valid data.
+	if (ItemType == EItemType::Consumable &&
+		ConsumableData.HealthRestore <= 0.0f && ConsumableData.StressReduce <= 0.0f)
+	{
+		Errors.Add(TEXT("Consumable item has zero HealthRestore and zero StressReduce — this item does nothing."));
+	}
+
+	// Check weapon has damage.
+	if (ItemType == EItemType::Weapon && EquipmentData.Damage <= 0.0f)
+	{
+		Errors.Add(TEXT("Weapon item has zero Damage."));
+	}
+
+	// Check stack limits.
+	if (StackLimit < 1)
+	{
+		Errors.Add(TEXT("StackLimit must be >= 1."));
+	}
+
+	// Build output string.
+	for (const FString& Err : Errors)
+	{
+		OutErrors += TEXT("- ") + Err + TEXT("\n");
+	}
+
+	if (Errors.Num() > 0)
+	{
+		UE_LOG(LogItemData, Warning, TEXT("DA_ItemData::ValidateItemData — '%s' has %d errors:\n%s"),
+			*ItemTag.GetTagName().ToString(), Errors.Num(), *OutErrors);
+	}
+
+	return Errors.Num() == 0;
+}
+#endif