Initial Agrarian Unreal project

Source/AgrarianGame/AgrarianInventoryComponent.cpp

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+// Copyright Pacificao. All Rights Reserved.
+
+#include "AgrarianInventoryComponent.h"
+#include "Net/UnrealNetwork.h"
+
+UAgrarianInventoryComponent::UAgrarianInventoryComponent()
+{
+	PrimaryComponentTick.bCanEverTick = false;
+	SetIsReplicatedByDefault(true);
+}
+
+void UAgrarianInventoryComponent::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
+{
+	Super::GetLifetimeReplicatedProps(OutLifetimeProps);
+	DOREPLIFETIME(UAgrarianInventoryComponent, Items);
+}
+
+bool UAgrarianInventoryComponent::HasItem(FName ItemId, int32 Quantity) const
+{
+	return GetItemCount(ItemId) >= Quantity;
+}
+
+int32 UAgrarianInventoryComponent::GetItemCount(FName ItemId) const
+{
+	int32 Count = 0;
+	for (const FAgrarianItemStack& Stack : Items)
+	{
+		if (Stack.ItemId == ItemId)
+		{
+			Count += Stack.Quantity;
+		}
+	}
+	return Count;
+}
+
+bool UAgrarianInventoryComponent::AddItem(const FAgrarianItemStack& Stack)
+{
+	if (!GetOwner() || !GetOwner()->HasAuthority() || !Stack.IsValidStack())
+	{
+		return false;
+	}
+
+	for (FAgrarianItemStack& Existing : Items)
+	{
+		if (Existing.ItemId == Stack.ItemId)
+		{
+			Existing.Quantity += Stack.Quantity;
+			BroadcastInventoryChanged();
+			return true;
+		}
+	}
+
+	if (Items.Num() >= MaxSlots)
+	{
+		return false;
+	}
+
+	Items.Add(Stack);
+	BroadcastInventoryChanged();
+	return true;
+}
+
+bool UAgrarianInventoryComponent::RemoveItem(FName ItemId, int32 Quantity)
+{
+	if (!GetOwner() || !GetOwner()->HasAuthority() || Quantity <= 0 || !HasItem(ItemId, Quantity))
+	{
+		return false;
+	}
+
+	int32 Remaining = Quantity;
+	for (int32 Index = Items.Num() - 1; Index >= 0 && Remaining > 0; --Index)
+	{
+		FAgrarianItemStack& Stack = Items[Index];
+		if (Stack.ItemId != ItemId)
+		{
+			continue;
+		}
+
+		const int32 Removed = FMath::Min(Stack.Quantity, Remaining);
+		Stack.Quantity -= Removed;
+		Remaining -= Removed;
+
+		if (Stack.Quantity <= 0)
+		{
+			Items.RemoveAt(Index);
+		}
+	}
+
+	BroadcastInventoryChanged();
+	return true;
+}
+
+void UAgrarianInventoryComponent::ServerAddItem_Implementation(const FAgrarianItemStack& Stack)
+{
+	AddItem(Stack);
+}
+
+void UAgrarianInventoryComponent::ServerRemoveItem_Implementation(FName ItemId, int32 Quantity)
+{
+	RemoveItem(ItemId, Quantity);
+}
+
+void UAgrarianInventoryComponent::OnRep_Items()
+{
+	BroadcastInventoryChanged();
+}
+
+void UAgrarianInventoryComponent::BroadcastInventoryChanged()
+{
+	OnInventoryChanged.Broadcast();
+}