// Fill out your copyright notice in the Description page of Project Settings.

#include "ItemEditorWindow.h"

#include "AssetRegistry/AssetRegistryModule.h"
#include "AssetRegistry/IAssetRegistry.h"
#include "ContentBrowserModule.h"
#include "IContentBrowserSingleton.h"
#include "DetailsViewArgs.h"
#include "Editor.h"
#include "FileHelpers.h"
#include "IDetailsView.h"
#include "Modules/ModuleManager.h"
#include "PropertyEditorModule.h"
#include "Styling/CoreStyle.h"
#include "Styling/SlateColor.h"
#include "Subsystems/AssetEditorSubsystem.h"
#include "UObject/Class.h"
#include "UObject/UnrealType.h"

#include "Widgets/Input/SButton.h"
#include "Widgets/Input/SCheckBox.h"
#include "Widgets/Input/SSearchBox.h"
#include "Widgets/Layout/SBorder.h"
#include "Widgets/Layout/SSplitter.h"
#include "Widgets/Layout/SWrapBox.h"
#include "Widgets/SBoxPanel.h"
#include "Widgets/Text/STextBlock.h"
#include "Widgets/Views/STableRow.h"

#include "ProjectEleri/Items/DataAssets/ItemDataAsset.h"

#define LOCTEXT_NAMESPACE "ItemEditorWindow"

/*-----------------------------------------------------------------------------
	Static helpers
-----------------------------------------------------------------------------*/

namespace
{
/** Best-effort conversion of the ItemCategory registry tag into an underlying Category enum value. */
int32 ParseCategoryFromRegistry(const FAssetData& InAsset)
{
	const UEnum* Enum = StaticEnum<Category>();
	if (!Enum)
	{
		return INDEX_NONE;
	}

	FString TagValue;
	if (!InAsset.GetTagValue<FString>(TEXT("ItemCategory"), TagValue))
	{
		return INDEX_NONE;
	}

	TagValue.TrimStartAndEndInline();
	if (TagValue.IsEmpty())
	{
		return INDEX_NONE;
	}

	// Some exports store the underlying integer ("2"), most store the value name ("Plant").
	if (TagValue.IsNumeric())
	{
		const int64 NumericValue = FCString::Atoi64(*TagValue);
		return Enum->GetIndexByValue(NumericValue) != INDEX_NONE ? (int32)NumericValue : INDEX_NONE;
	}

	int64 ParsedValue = Enum->GetValueByNameString(TagValue);
	if (ParsedValue != INDEX_NONE)
	{
		return (int32)ParsedValue;
	}

	// Defensive: strip a possible "Category::Plant" style prefix.
	const int32 ScopeIndex = TagValue.Find(TEXT("::"));
	if (ScopeIndex != INDEX_NONE)
	{
		ParsedValue = Enum->GetValueByNameString(TagValue.RightChop(ScopeIndex + 2));
		if (ParsedValue != INDEX_NONE)
		{
			return (int32)ParsedValue;
		}
	}

	return INDEX_NONE;
}

/** Short display name of a Category value ("Plant"), or empty when not resolvable. */
FString GetCategoryShortName(int32 InCategoryValue)
{
	const UEnum* Enum = StaticEnum<Category>();
	if (!Enum || InCategoryValue < 0)
	{
		return FString();
	}
	return Enum->GetNameStringByValue((int64)InCategoryValue);
}
} // namespace

FString SItemEditorWindow::GetTaggedItemName(const FAssetData& InAsset)
{
	FString ItemName;
	if (InAsset.GetTagValue<FString>(TEXT("ItemName"), ItemName))
	{
		return ItemName;
	}
	return FString();
}

FString SItemEditorWindow::GetEntryDisplayName(const FItemListEntry& InEntry)
{
	if (!InEntry.ItemName.IsEmpty())
	{
		return InEntry.ItemName;
	}
	// No ItemName tag on disk yet: fall back to the asset file name.
	return InEntry.AssetData.AssetName.ToString();
}

FString SItemEditorWindow::BuildEntrySearchText(const FItemListEntry& InEntry)
{
	FString Combined = FString::Printf(TEXT("%s %s %s %s"),
		*GetEntryDisplayName(InEntry),
		*GetCategoryShortName(InEntry.CategoryValue),
		*InEntry.AssetData.AssetName.ToString(),
		*InEntry.AssetData.PackageName.ToString());
	return Combined.ToLower();
}

/*-----------------------------------------------------------------------------
	Widget construction
-----------------------------------------------------------------------------*/

SItemEditorWindow::~SItemEditorWindow()
{
	if (DetailsView.IsValid())
	{
		DetailsView->OnFinishedChangingProperties().RemoveAll(this);
	}
}

void SItemEditorWindow::Construct(const FArguments& InArgs)
{
	// --- Details view that edits the selected data asset object directly ---
	FPropertyEditorModule& PropertyEditorModule = FModuleManager::LoadModuleChecked<FPropertyEditorModule>(TEXT("PropertyEditor"));

	FDetailsViewArgs DetailsArgs;
	DetailsArgs.bHideSelectionTip = true;
	DetailsArgs.bLockable = false;
	DetailsArgs.bAllowSearch = true;
	DetailsArgs.bShowOptions = true;
	DetailsArgs.bShowObjectLabel = false;
	DetailsArgs.bShowModifiedPropertiesOption = true;
	DetailsArgs.bAllowFavoriteSystem = true;
	DetailsArgs.NameAreaSettings = FDetailsViewArgs::HideNameArea;

	DetailsView = PropertyEditorModule.CreateDetailView(DetailsArgs);
	DetailsView->SetObject(nullptr);
	DetailsView->OnFinishedChangingProperties().AddRaw(this, &SItemEditorWindow::OnAssetPropertyChanged);

	InitCategoryFilter();

	ChildSlot
	[
		SNew(SVerticalBox)

		// ---- Search box + refresh button ------------------------------------------------
		+ SVerticalBox::Slot()
		.AutoHeight()
		.Padding(4.f, 4.f, 4.f, 6.f)
		[
			SNew(SHorizontalBox)

			+ SHorizontalBox::Slot()
			.FillWidth(1.f)
			.VAlign(VAlign_Center)
			[
				SAssignNew(SearchBox, SSearchBox)
				.HintText(LOCTEXT("SearchHint", "Type an item name to find it..."))
				.OnTextChanged(this, &SItemEditorWindow::OnSearchTextChanged)
				.OnTextCommitted(this, &SItemEditorWindow::OnSearchTextCommitted)
			]

			+ SHorizontalBox::Slot()
			.AutoWidth()
			.Padding(6.f, 0.f, 0.f, 0.f)
			[
				SNew(SButton)
				.Text(LOCTEXT("RefreshList", "Refresh"))
				.ToolTipText(LOCTEXT("RefreshTip", "Re-scan the Asset Registry for every item data asset."))
				.OnClicked(this, &SItemEditorWindow::OnRefreshClicked)
			]
		]

		// ---- Category filter chips (multi select, empty selection = all) ----------------
		+ SVerticalBox::Slot()
		.AutoHeight()
		.Padding(4.f, 0.f, 4.f, 6.f)
		[
			MakeCategoryFilterWidget()
		]

		// ---- List of items (left) + details view (right) -------------------------------
		+ SVerticalBox::Slot()
		.FillHeight(1.f)
		.Padding(4.f, 0.f, 4.f, 0.f)
		[
			SNew(SSplitter)
			.Orientation(Orient_Horizontal)

			+ SSplitter::Slot()
			.Value(0.32f)
			.MinSize(240.f)
			[
				SNew(SBorder)
				.BorderImage(FCoreStyle::Get().GetBrush(TEXT("Border")))
				.Padding(4.f)
				[
					SNew(SVerticalBox)

					+ SVerticalBox::Slot()
					.AutoHeight()
					.Padding(0.f, 2.f, 0.f, 4.f)
					[
						SNew(STextBlock)
						.Text(LOCTEXT("ItemsLabel", "Items"))
						.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Bold"), 11))
					]

					+ SVerticalBox::Slot()
					.FillHeight(1.f)
					[
						SAssignNew(ListView, SListView<FItemEntry>)
						.ListItemsSource(&FilteredItems)
						.SelectionMode(ESelectionMode::Single)
						.OnGenerateRow(this, &SItemEditorWindow::OnGenerateRow)
						.OnSelectionChanged(this, &SItemEditorWindow::OnItemSelectionChanged)
						.OnMouseButtonDoubleClick(this, &SItemEditorWindow::OnItemDoubleClicked)
					]
				]
			]

			+ SSplitter::Slot()
			.Value(0.68f)
			.MinSize(360.f)
			[
				SNew(SBorder)
				.BorderImage(FCoreStyle::Get().GetBrush(TEXT("Border")))
				.Padding(4.f)
				[
					SNew(SVerticalBox)

					+ SVerticalBox::Slot()
					.AutoHeight()
					.Padding(0.f, 2.f, 0.f, 6.f)
					[
						SNew(STextBlock)
						.Text(this, &SItemEditorWindow::GetSelectionStatusText)
						.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Bold"), 11))
					]

					+ SVerticalBox::Slot()
					.FillHeight(1.f)
					[
						DetailsView->AsShared()
					]
				]
			]
		]

		// ---- Status bar with auto-save + save actions ----------------------------------
		+ SVerticalBox::Slot()
		.AutoHeight()
		.Padding(4.f, 4.f, 4.f, 4.f)
		[
			SNew(SHorizontalBox)

			+ SHorizontalBox::Slot()
			.AutoWidth()
			.VAlign(VAlign_Center)
			.Padding(0.f, 0.f, 12.f, 0.f)
			[
				SNew(SCheckBox)
				.ToolTipText(LOCTEXT("AutoSaveTip", "Save the data asset to disk automatically after every change."))
				.IsChecked_Lambda([this]() -> ECheckBoxState
				{
					return bAutoSaveOnChange ? ECheckBoxState::Checked : ECheckBoxState::Unchecked;
				})
				.OnCheckStateChanged(this, &SItemEditorWindow::OnAutoSaveCheckChanged)
				[
					SNew(STextBlock)
					.Text(LOCTEXT("AutoSaveLabel", "Auto-save on edit"))
				]
			]

			+ SHorizontalBox::Slot()
			.FillWidth(1.f)
			.VAlign(VAlign_Center)
			.Padding(0.f, 0.f, 12.f, 0.f)
			[
				SAssignNew(StatusText, STextBlock)
				.Text(FText::GetEmpty())
				.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Regular"), 9))
			]

			+ SHorizontalBox::Slot()
			.AutoWidth()
			.Padding(4.f, 0.f, 0.f, 0.f)
			[
				SNew(SButton)
				.Text(LOCTEXT("SaveAsset", "Save"))
				.ToolTipText(LOCTEXT("SaveTip", "Write the selected data asset to disk."))
				.IsEnabled_Lambda([this]() { return CurrentAsset.IsValid(); })
				.OnClicked(this, &SItemEditorWindow::OnSaveClicked)
			]

			+ SHorizontalBox::Slot()
			.AutoWidth()
			.Padding(4.f, 0.f, 0.f, 0.f)
			[
				SNew(SButton)
				.Text(LOCTEXT("OpenEditor", "Open Asset Editor"))
				.ToolTipText(LOCTEXT("OpenEditorTip", "Open the selected asset in the regular data asset editor."))
				.IsEnabled_Lambda([this]() { return CurrentAsset.IsValid(); })
				.OnClicked(this, &SItemEditorWindow::OnOpenAssetEditorClicked)
			]

			+ SHorizontalBox::Slot()
			.AutoWidth()
			.Padding(4.f, 0.f, 0.f, 0.f)
			[
				SNew(SButton)
				.Text(LOCTEXT("FindInCB", "Find in Content Browser"))
				.ToolTipText(LOCTEXT("FindInCBTip", "Select the asset in the Content Browser."))
				.IsEnabled_Lambda([this]() { return CurrentAsset.IsValid(); })
				.OnClicked(this, &SItemEditorWindow::OnFindInContentBrowserClicked)
			]
		]
	];

	RefreshAssetList();
}

/*-----------------------------------------------------------------------------
	Category filter
-----------------------------------------------------------------------------*/

void SItemEditorWindow::InitCategoryFilter()
{
	CategoryFilterValues.Reset();
	SelectedCategoryValues.Reset();

	const UEnum* Enum = StaticEnum<Category>();
	if (!Enum)
	{
		return;
	}

	for (int32 Index = 0; Index < Enum->NumEnums(); ++Index)
	{
		if (Enum->HasMetaData(TEXT("Hidden"), Index))
		{
			continue; // e.g. Category::MAX
		}

		const int64 Value = Enum->GetValueByIndex(Index);
		if (Value >= 0)
		{
			CategoryFilterValues.Add((int32)Value);
		}
	}
}

TSharedRef<SWidget> SItemEditorWindow::MakeCategoryFilterWidget()
{
	const UEnum* Enum = StaticEnum<Category>();

	TSharedRef<SWrapBox> WrapBox = SNew(SWrapBox)
		.UseAllottedSize(true)
		.InnerSlotPadding(FVector2D(4.f, 3.f));

	// "All" chip - clears every category selection.
	WrapBox->AddSlot()
	[
		MakeCategoryCheckBox(INDEX_NONE, LOCTEXT("AllCategories", "All"))
	];

	for (const int32 CategoryValue : CategoryFilterValues)
	{
		FText Label;
		if (Enum)
		{
			Label = Enum->GetDisplayNameTextByValue((int64)CategoryValue);
		}
		if (Label.IsEmpty())
		{
			Label = FText::FromString(FString::FromInt(CategoryValue));
		}

		WrapBox->AddSlot()
		[
			MakeCategoryCheckBox(CategoryValue, Label)
		];
	}

	return SNew(SHorizontalBox)

		+ SHorizontalBox::Slot()
		.AutoWidth()
		.VAlign(VAlign_Center)
		.Padding(FMargin(0.f, 0.f, 10.f, 0.f))
		[
			SNew(STextBlock)
			.Text(LOCTEXT("CategoryFilterLabel", "Category:"))
			.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Bold"), 10))
		]

		+ SHorizontalBox::Slot()
		.FillWidth(1.f)
		.VAlign(VAlign_Center)
		[
			WrapBox
		];
}

TSharedRef<SWidget> SItemEditorWindow::MakeCategoryCheckBox(int32 InCategoryValue, const FText& InLabel)
{
	return SNew(SCheckBox)
		.Padding(FMargin(2.f, 1.f, 4.f, 1.f))
		.IsChecked_Lambda([this, InCategoryValue]()
		{
			return IsCategoryChecked(InCategoryValue);
		})
		.OnCheckStateChanged_Lambda([this, InCategoryValue](ECheckBoxState InState)
		{
			OnCategoryToggled(InCategoryValue, InState);
		})
		[
			SNew(STextBlock)
			.Text(InLabel)
			.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Regular"), 10))
		];
}

ECheckBoxState SItemEditorWindow::IsCategoryChecked(int32 InCategoryValue) const
{
	if (InCategoryValue == INDEX_NONE)
	{
		// "All" is active when no specific category is selected.
		return SelectedCategoryValues.Num() == 0 ? ECheckBoxState::Checked : ECheckBoxState::Unchecked;
	}
	return SelectedCategoryValues.Contains(InCategoryValue) ? ECheckBoxState::Checked : ECheckBoxState::Unchecked;
}

void SItemEditorWindow::OnCategoryToggled(int32 InCategoryValue, ECheckBoxState InState)
{
	if (InCategoryValue == INDEX_NONE)
	{
		SelectedCategoryValues.Reset();
	}
	else if (InState == ECheckBoxState::Checked)
	{
		SelectedCategoryValues.Add(InCategoryValue);
	}
	else
	{
		SelectedCategoryValues.Remove(InCategoryValue);
	}

	ApplyFilter();
	SetStatusMessage(FString::Printf(TEXT("%d of %d items shown"), FilteredItems.Num(), ItemEntries.Num()));
}

/*-----------------------------------------------------------------------------
	Item list / filtering
-----------------------------------------------------------------------------*/

void SItemEditorWindow::RefreshAssetList()
{
	const UItemDataAsset* PreviouslySelected = GetCurrentAsset();

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

	TArray<FAssetData> Assets;
	AssetRegistry.GetAssetsByClass(UItemDataAsset::StaticClass()->GetClassPathName(), Assets, /*bSearchSubClasses=*/true);

	ItemEntries.Reset();
	ItemEntries.Reserve(Assets.Num());
	for (FAssetData& Asset : Assets)
	{
		TSharedPtr<FItemListEntry> Entry = MakeShared<FItemListEntry>();
		Entry->AssetData = Asset;

		// Prefer the live object so name/category are always exact; registry tags are the fallback.
		UItemDataAsset* DataAsset = Cast<UItemDataAsset>(Asset.GetAsset());
		if (DataAsset)
		{
			Entry->ItemName = DataAsset->ItemName.ToString();
			Entry->CategoryValue = (int32)DataAsset->ItemCategory;
		}
		else
		{
			Entry->ItemName = GetTaggedItemName(Asset);
			Entry->CategoryValue = ParseCategoryFromRegistry(Asset);
		}

		Entry->SearchText = BuildEntrySearchText(*Entry);
		ItemEntries.Add(Entry);
	}

	ApplyFilter();

	// Restore the list highlight for the asset we were editing (details view stays untouched).
	if (PreviouslySelected && ListView)
	{
		if (FItemEntry Entry = FindEntryForAsset(PreviouslySelected))
		{
			ListView->SetSelection(Entry, ESelectInfo::Direct);
		}
	}

	SetStatusMessage(FString::Printf(TEXT("%d item data assets found (%d shown)"), ItemEntries.Num(), FilteredItems.Num()));
}

void SItemEditorWindow::ApplyFilter()
{
	FString SearchTerm = SearchFilterText.ToString();
	SearchTerm.TrimStartAndEndInline();
	const FString SearchLower = SearchTerm.ToLower();

	FilteredItems.Reset();
	const bool bFilteringByCategory = SelectedCategoryValues.Num() > 0;

	for (const FItemEntry& Entry : ItemEntries)
	{
		// Name / asset search term.
		if (!SearchLower.IsEmpty() && !Entry->SearchText.Contains(SearchLower))
		{
			continue;
		}

		// Category inclusion filter (empty selection shows every category).
		if (bFilteringByCategory &&
			(Entry->CategoryValue == INDEX_NONE || !SelectedCategoryValues.Contains(Entry->CategoryValue)))
		{
			continue;
		}

		FilteredItems.Add(Entry);
	}

	// Case insensitive alphabetical sort by item name.
	FilteredItems.Sort([](const FItemEntry& A, const FItemEntry& B)
	{
		const FString NameA = A->ItemName.ToLower();
		const FString NameB = B->ItemName.ToLower();
		if (NameA == NameB)
		{
			return A->AssetData.AssetName.LexicalLess(B->AssetData.AssetName);
		}
		return NameA < NameB;
	});

	if (ListView)
	{
		ListView->RequestListRefresh();
	}
}

void SItemEditorWindow::SelectFirstVisibleItem()
{
	if (FilteredItems.Num() == 0)
	{
		return;
	}

	FItemEntry FirstItem = FilteredItems[0];
	ListView->SetSelection(FirstItem, ESelectInfo::OnNavigation);
	ListView->RequestScrollIntoView(FirstItem);
}

SItemEditorWindow::FItemEntry SItemEditorWindow::FindEntryForAsset(const UItemDataAsset* InAsset)
{
	if (!InAsset)
	{
		return nullptr;
	}

	const FString AssetPath = InAsset->GetPathName();
	for (const FItemEntry& Entry : ItemEntries)
	{
		if (Entry->AssetData.GetObjectPathString() == AssetPath)
		{
			return Entry;
		}
	}
	return nullptr;
}

void SItemEditorWindow::UpdateEntryFromLoadedAsset(FItemEntry InEntry, const UItemDataAsset* InAsset)
{
	if (!InEntry || !InAsset)
	{
		return;
	}
	InEntry->ItemName = InAsset->ItemName.ToString();
	InEntry->CategoryValue = (int32)InAsset->ItemCategory;
	InEntry->SearchText = BuildEntrySearchText(*InEntry);
}

/*-----------------------------------------------------------------------------
	Item rows
-----------------------------------------------------------------------------*/

TSharedRef<ITableRow> SItemEditorWindow::OnGenerateRow(FItemEntry InItem, const TSharedRef<STableViewBase>& InOwnerTable)
{
	check(InItem.IsValid());

	const FString CategoryLabel = GetCategoryShortName(InItem->CategoryValue);
	const FString AssetPath = CategoryLabel.IsEmpty()
		? FString::Printf(TEXT("%s / %s"),
			*InItem->AssetData.PackageName.ToString(),
			*InItem->AssetData.AssetName.ToString())
		: FString::Printf(TEXT("%s / %s  (%s)"),
			*InItem->AssetData.PackageName.ToString(),
			*InItem->AssetData.AssetName.ToString(),
			*CategoryLabel);

	return SNew(STableRow<FItemEntry>, InOwnerTable)
		.Padding(FMargin(4.f, 2.f, 4.f, 2.f))
		[
			SNew(SVerticalBox)

			+ SVerticalBox::Slot()
			.AutoHeight()
			[
				SNew(STextBlock)
				.Text(FText::FromString(GetEntryDisplayName(*InItem)))
				.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Bold"), 10))
			]

			+ SVerticalBox::Slot()
			.AutoHeight()
			[
				SNew(STextBlock)
				.Text(FText::FromString(AssetPath))
				.Font(FCoreStyle::GetDefaultFontStyle(TEXT("Regular"), 8))
				.ColorAndOpacity(FSlateColor(FLinearColor(0.55f, 0.55f, 0.55f)))
			]
		];
}

/*-----------------------------------------------------------------------------
	Search & selection callbacks
-----------------------------------------------------------------------------*/

void SItemEditorWindow::OnSearchTextChanged(const FText& InText)
{
	SearchFilterText = InText;
	ApplyFilter();

	if (FilteredItems.Num() == 0)
	{
		SetStatusMessage(TEXT("No items match that name."));
	}
	else
	{
		SetStatusMessage(FString::Printf(TEXT("%d of %d items shown"), FilteredItems.Num(), ItemEntries.Num()));
	}
}

void SItemEditorWindow::OnSearchTextCommitted(const FText& InText, ETextCommit::Type InCommitType)
{
	if (InCommitType == ETextCommit::OnEnter)
	{
		SelectFirstVisibleItem();
	}
}

void SItemEditorWindow::OnItemSelectionChanged(FItemEntry InItem, ESelectInfo::Type InSelectInfo)
{
	// Programmatic selections (e.g. restoring the highlight after a refresh) are already handled.
	if (InSelectInfo == ESelectInfo::Direct)
	{
		return;
	}
	if (!InItem)
	{
		return;
	}

	UItemDataAsset* Asset = LoadAssetForEntry(InItem);
	if (!Asset)
	{
		return;
	}

	CurrentAsset = Asset;
	DetailsView->SetObject(Asset, /*bForceRefresh=*/true);
	SetStatusMessage(FString::Printf(TEXT("Editing %s"), *Asset->GetPathName()));
}

void SItemEditorWindow::OnItemDoubleClicked(FItemEntry InItem)
{
	if (!InItem)
	{
		return;
	}

	UItemDataAsset* Asset = LoadAssetForEntry(InItem);
	if (!Asset)
	{
		return;
	}

	CurrentAsset = Asset;
	DetailsView->SetObject(Asset, /*bForceRefresh=*/true);
	OpenInAssetEditor(Asset);
}

void SItemEditorWindow::OnAssetPropertyChanged(const FPropertyChangedEvent& InEvent)
{
	if (UItemDataAsset* Asset = GetCurrentAsset())
	{
		// Keep the list label in sync (e.g. when ItemName is edited).
		if (FItemEntry Entry = FindEntryForAsset(Asset))
		{
			UpdateEntryFromLoadedAsset(Entry, Asset);
			if (ListView)
			{
				ListView->RequestListRefresh();
			}
		}

		if (bAutoSaveOnChange)
		{
			SaveCurrentAsset();
		}
	}
}

/*-----------------------------------------------------------------------------
	Asset loading / accessors
-----------------------------------------------------------------------------*/

UItemDataAsset* SItemEditorWindow::GetCurrentAsset() const
{
	return CurrentAsset.Get();
}

UItemDataAsset* SItemEditorWindow::LoadAssetForEntry(FItemEntry InItem)
{
	if (!InItem)
	{
		return nullptr;
	}

	UObject* LoadedObject = InItem->AssetData.GetAsset();
	if (!LoadedObject)
	{
		SetStatusMessage(FString::Printf(TEXT("Failed to load %s."), *InItem->AssetData.GetObjectPathString()), /*bIsError=*/true);
		return nullptr;
	}

	UItemDataAsset* Asset = Cast<UItemDataAsset>(LoadedObject);
	if (!Asset)
	{
		SetStatusMessage(FString::Printf(TEXT("%s is not an ItemDataAsset."), *InItem->AssetData.GetObjectPathString()), /*bIsError=*/true);
		return nullptr;
	}
	return Asset;
}

/*-----------------------------------------------------------------------------
	Actions
-----------------------------------------------------------------------------*/

FReply SItemEditorWindow::OnRefreshClicked()
{
	RefreshAssetList();
	return FReply::Handled();
}

FReply SItemEditorWindow::OnSaveClicked()
{
	SaveCurrentAsset();
	return FReply::Handled();
}

FReply SItemEditorWindow::OnOpenAssetEditorClicked()
{
	if (UItemDataAsset* Asset = GetCurrentAsset())
	{
		OpenInAssetEditor(Asset);
	}
	return FReply::Handled();
}

FReply SItemEditorWindow::OnFindInContentBrowserClicked()
{
	if (UItemDataAsset* Asset = GetCurrentAsset())
	{
		ShowInContentBrowser(Asset);
	}
	return FReply::Handled();
}

void SItemEditorWindow::OnAutoSaveCheckChanged(ECheckBoxState InState)
{
	bAutoSaveOnChange = (InState == ECheckBoxState::Checked);
	SetStatusMessage(bAutoSaveOnChange ? TEXT("Auto-save enabled") : TEXT("Auto-save disabled"));
}

void SItemEditorWindow::SaveCurrentAsset()
{
	UItemDataAsset* Asset = GetCurrentAsset();
	if (!Asset)
	{
		SetStatusMessage(TEXT("No item selected."), /*bIsError=*/true);
		return;
	}

	UPackage* Package = Asset->GetPackage();
	if (!Package)
	{
		SetStatusMessage(TEXT("Selected item has no package."), /*bIsError=*/true);
		return;
	}

	Package->SetDirtyFlag(true);
	if (UEditorLoadingAndSavingUtils::SavePackages(TArray<UPackage*>{Package}, /*bOnlyDirty=*/true))
	{
		if (FItemEntry Entry = FindEntryForAsset(Asset))
		{
			UpdateEntryFromLoadedAsset(Entry, Asset);
			if (ListView)
			{
				ListView->RequestListRefresh();
			}
		}
		SetStatusMessage(FString::Printf(TEXT("Saved %s"), *Asset->GetName()));
	}
	else
	{
		SetStatusMessage(FString::Printf(TEXT("Failed to save %s."), *Asset->GetName()), /*bIsError=*/true);
	}
}

void SItemEditorWindow::OpenInAssetEditor(UItemDataAsset* InAsset)
{
	if (!InAsset)
	{
		return;
	}

	if (UAssetEditorSubsystem* AssetEditorSubsystem = GEditor->GetEditorSubsystem<UAssetEditorSubsystem>())
	{
		AssetEditorSubsystem->OpenEditorForAsset(InAsset);
	}
}

void SItemEditorWindow::ShowInContentBrowser(UItemDataAsset* InAsset)
{
	if (!InAsset)
	{
		return;
	}

	FContentBrowserModule& ContentBrowserModule = FModuleManager::LoadModuleChecked<FContentBrowserModule>(TEXT("ContentBrowser"));
	ContentBrowserModule.Get().SyncBrowserToAssets(TArray<UObject*>{InAsset});
}

void SItemEditorWindow::SetStatusMessage(const FString& InMessage, bool bIsError)
{
	if (!StatusText)
	{
		return;
	}

	const FLinearColor TextColor = bIsError ? FLinearColor(1.f, 0.35f, 0.35f) : FLinearColor(0.7f, 0.7f, 0.7f);
	StatusText->SetColorAndOpacity(FSlateColor(TextColor));
	StatusText->SetText(FText::FromString(InMessage));
}

FText SItemEditorWindow::GetSelectionStatusText() const
{
	if (UItemDataAsset* Asset = GetCurrentAsset())
	{
		return FText::FromString(Asset->GetPathName());
	}
	return LOCTEXT("NoSelection", "Select an item to edit it");
}

#undef LOCTEXT_NAMESPACE