// Copyright Epic Games, Inc. All Rights Reserved.

#include "CoreMinimal.h"
#include "GlobalEditorNotification.h"
#include "LandscapeProxy.h"
#include "Widgets/Notifications/SNotificationList.h"
#include "Framework/Application/SlateApplication.h"
#include "UnrealEdGlobals.h"
#include "Editor/UnrealEdEngine.h"

/** Notification class for grassmmap rendering. */
class FGrassRenderingNotificationImpl: public FGlobalEditorNotification
{
protected:
    /** FGlobalEditorNotification interface */
    virtual bool ShouldShowNotification(const bool bIsNotificationAlreadyActive) const override;
    virtual void SetNotificationText(const TSharedPtr<SNotificationItem>& InNotificationItem) const override;
};

/** Global notification object. */
FGrassRenderingNotificationImpl GGrassRenderingNotification;

bool FGrassRenderingNotificationImpl::ShouldShowNotification(const bool bIsNotificationAlreadyActive) const
{
    // Avoid showing the notification when a user is interacting as it causes a focus lost event which prevents them from dragging
    return ALandscapeProxy::TotalComponentsNeedingGrassMapRender > 0 && !(FSlateApplication::Get().HasAnyMouseCaptor() || GUnrealEd->IsUserInteracting());
}

void FGrassRenderingNotificationImpl::SetNotificationText(const TSharedPtr<SNotificationItem>& InNotificationItem) const
{
    if (ALandscapeProxy::TotalComponentsNeedingGrassMapRender > 0)
    {
        FFormatNamedArguments Args;
        Args.Add(TEXT("OutstandingGrassMaps"), FText::AsNumber(ALandscapeProxy::TotalComponentsNeedingGrassMapRender));
        const FText ProgressMessage = FText::Format(NSLOCTEXT("GrassMapRender", "GrassMapRenderFormat", "Building Grass Maps ({OutstandingGrassMaps})"), Args);
        InNotificationItem->SetText(ProgressMessage);
    }
}