// Portage UE 5.5 - voir LPFixButtonPaddingCommandlet.h

#include "LPFixButtonPaddingCommandlet.h"

#include "AssetRegistry/AssetData.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "Blueprint/WidgetTree.h"
#include "Components/Button.h"
#include "Kismet2/BlueprintEditorUtils.h"
#include "Kismet2/KismetEditorUtilities.h"
#include "Misc/PackageName.h"
#include "UObject/Package.h"
#include "UObject/SavePackage.h"
#include "WidgetBlueprint.h"

DEFINE_LOG_CATEGORY_STATIC(LogLPFixButton, Log, All);

namespace
{
	// Valeurs de UE 4.27 : Engine/Source/Runtime/SlateCore/Private/Styling/CoreStyle.cpp
	const FMargin UE4NormalPadding(2.f, 2.f, 2.f, 2.f);
	const FMargin UE4PressedPadding(2.f, 3.f, 2.f, 1.f);

	FString Str(const FMargin& M)
	{
		return FString::Printf(TEXT("(%g,%g,%g,%g)"), M.Left, M.Top, M.Right, M.Bottom);
	}
	/** Remplace par la valeur UE4 chaque composante egale au defaut UE5. Vrai si modifie. */
	bool FixMargin(FMargin& M, const FMargin& UE5, const FMargin& UE4)
	{
		const FMargin Before = M;
		if (M.Left == UE5.Left) { M.Left = UE4.Left; }
		if (M.Top == UE5.Top) { M.Top = UE4.Top; }
		if (M.Right == UE5.Right) { M.Right = UE4.Right; }
		if (M.Bottom == UE5.Bottom) { M.Bottom = UE4.Bottom; }
		return !(M == Before);
	}
}


ULPFixButtonPaddingCommandlet::ULPFixButtonPaddingCommandlet()
{
	IsClient = false;
	IsServer = false;
	IsEditor = true;
	LogToConsole = true;
}

int32 ULPFixButtonPaddingCommandlet::Main(const FString& Params)
{
	const bool bDryRun = Params.Contains(TEXT("DryRun"), ESearchCase::IgnoreCase);

	// Defaut UE5 lu sur le CDO plutot que recopie : c'est lui que recoivent les boutons 4.27.
	PRAGMA_DISABLE_DEPRECATION_WARNINGS
	const FButtonStyle& UE5Style = GetDefault<UButton>()->WidgetStyle;
	PRAGMA_ENABLE_DEPRECATION_WARNINGS
	const FMargin UE5Normal = UE5Style.NormalPadding;
	const FMargin UE5Pressed = UE5Style.PressedPadding;

	UE_LOG(LogLPFixButton, Warning, TEXT("=== Marges de UButton : defaut UE5 Normal=%s Pressed=%s -> UE4 Normal=%s Pressed=%s%s ==="),
		*Str(UE5Normal), *Str(UE5Pressed), *Str(UE4NormalPadding), *Str(UE4PressedPadding),
		bDryRun ? TEXT(" [DRY RUN]") : TEXT(""));

	FAssetRegistryModule& AssetRegistryModule =
		FModuleManager::LoadModuleChecked<FAssetRegistryModule>(TEXT("AssetRegistry"));
	AssetRegistryModule.Get().SearchAllAssets(true);

	TArray<FAssetData> Assets;
	AssetRegistryModule.Get().GetAssetsByClass(UWidgetBlueprint::StaticClass()->GetClassPathName(), Assets, true);

	int32 ButtonsSeen = 0;
	int32 ButtonsFixed = 0;
	int32 ButtonsKept = 0;
	int32 BlueprintsModified = 0;
	int32 SaveFailures = 0;

	for (const FAssetData& AssetData : Assets)
	{
		if (!AssetData.PackageName.ToString().StartsWith(TEXT("/Game/")))
		{
			continue;
		}
		UWidgetBlueprint* Blueprint = Cast<UWidgetBlueprint>(AssetData.GetAsset());
		if (!Blueprint || !Blueprint->WidgetTree)
		{
			continue;
		}

		TArray<UWidget*> Widgets;
		Blueprint->WidgetTree->GetAllWidgets(Widgets);

		int32 FixedHere = 0;
		for (UWidget* Widget : Widgets)
		{
			UButton* Button = Cast<UButton>(Widget);
			if (!Button)
			{
				continue;
			}
			++ButtonsSeen;

			PRAGMA_DISABLE_DEPRECATION_WARNINGS
			FButtonStyle Style = Button->WidgetStyle;
			PRAGMA_ENABLE_DEPRECATION_WARNINGS
			// Composante par composante : FMargin est serialise champ par champ, une marge 4.27
			// partiellement modifiee (ex. Top/Bottom seuls) a recu les autres champs du defaut UE5.
			const FMargin OldNormal = Style.NormalPadding;
			const FMargin OldPressed = Style.PressedPadding;
			const bool bNormal = FixMargin(Style.NormalPadding, UE5Normal, UE4NormalPadding);
			const bool bPressed = FixMargin(Style.PressedPadding, UE5Pressed, UE4PressedPadding);
			if (!bNormal && !bPressed)
			{
				++ButtonsKept;
				UE_LOG(LogLPFixButton, Display, TEXT("  garde %s :: %s  Normal=%s Pressed=%s"),
					*Blueprint->GetName(), *Button->GetName(), *Str(OldNormal), *Str(OldPressed));
				continue;
			}

			UE_LOG(LogLPFixButton, Warning, TEXT("  %s :: %s  Normal %s -> %s | Pressed %s -> %s"),
				*Blueprint->GetName(), *Button->GetName(),
				*Str(OldNormal), *Str(Style.NormalPadding), *Str(OldPressed), *Str(Style.PressedPadding));
			++ButtonsFixed;
			++FixedHere;

			if (bDryRun)
			{
				continue;
			}
			Button->Modify();
			Button->SetStyle(Style);
		}

		if (FixedHere == 0)
		{
			continue;
		}
		if (bDryRun)
		{
			// Liste des paquets a sauvegarder (Snapshot) avant l'application reelle.
			UE_LOG(LogLPFixButton, Warning, TEXT("  paquet %s (%d bouton(s))"), *Blueprint->GetOutermost()->GetName(), FixedHere);
			continue;
		}

		++BlueprintsModified;
		FBlueprintEditorUtils::MarkBlueprintAsModified(Blueprint);
		FKismetEditorUtilities::CompileBlueprint(Blueprint);

		UPackage* Package = Blueprint->GetOutermost();
		FString Filename;
		if (!FPackageName::TryConvertLongPackageNameToFilename(
				Package->GetName(), Filename, FPackageName::GetAssetPackageExtension()))
		{
			++SaveFailures;
			UE_LOG(LogLPFixButton, Error, TEXT("  chemin introuvable pour %s"), *Package->GetName());
			continue;
		}

		ResetLoaders(Package);

		FSavePackageArgs SaveArgs;
		SaveArgs.TopLevelFlags = RF_Public | RF_Standalone;
		SaveArgs.SaveFlags = SAVE_None;
		SaveArgs.bWarnOfLongFilename = true;
		// GWarn et non GError : en commandlet, GError rend toute erreur de save fatale.
		SaveArgs.Error = GWarn;

		if (UPackage::SavePackage(Package, nullptr, *Filename, SaveArgs))
		{
			UE_LOG(LogLPFixButton, Warning, TEXT("  -> %s sauvegarde (%d bouton(s))."), *Package->GetName(), FixedHere);
		}
		else
		{
			++SaveFailures;
			UE_LOG(LogLPFixButton, Error, TEXT("  -> ECHEC de sauvegarde de %s"), *Package->GetName());
		}
	}

	UE_LOG(LogLPFixButton, Warning,
		TEXT("=== Termine : %d bouton(s) vu(s), %d a la marge UE5 %s, %d garde(s), %d Widget Blueprint(s) modifie(s), %d echec(s) de sauvegarde. ==="),
		ButtonsSeen, ButtonsFixed, bDryRun ? TEXT("(a corriger)") : TEXT("corrige(s)"), ButtonsKept, BlueprintsModified, SaveFailures);

	return SaveFailures > 0 ? 1 : 0;
}