#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "aboutdialog.h"
#include "preferenceeditor.h"
#include "reportissuedialog.h"
#include "statusbarmanager.h"
#include "logmanager.h"
#include "xtreewidget.h"
#include "xtreewidgetitem.h"
#include "compression.h"
#include "scripttypeeditorwidget.h"
#include "dsluischema.h"
#include "utils.h"
#include "imagepreviewwidget.h"

#include <QFileDialog>
#include <QStandardPaths>
#include <QMessageBox>
#include <QDebug>
#include <QTableWidgetItem>
#include <QTreeWidgetItem>
#include <QDockWidget>
#include <QPlainTextEdit>
#include <QMimeData>
#include <QProgressBar>
#include <QProgressDialog>
#include <QApplication>
#include <QtMath>
#include <QtEndian>
#include <QDirIterator>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setAcceptDrops(true);

    mTreeWidget = new XTreeWidget(this);
    mLogWidget = new QPlainTextEdit(this);

    mProgressBar = new QProgressBar(this);
    mProgressBar->setMaximum(100);  // Default max value
    mProgressBar->setVisible(false); // Initially hidden

    connect(&StatusBarManager::instance(), &StatusBarManager::statusUpdated,
            this, &MainWindow::HandleStatusUpdate);

    connect(&StatusBarManager::instance(), &StatusBarManager::progressUpdated,
            this, &MainWindow::HandleProgressUpdate);

    connect(&LogManager::instance(), &LogManager::entryAdded,
            this, &MainWindow::HandleLogEntry);

    statusBar()->addPermanentWidget(mProgressBar);

    ui->tabWidget->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(ui->tabWidget, &QTabWidget::customContextMenuRequested, this, [this](const QPoint &pos) {
        if (pos.isNull())
            return;

        int tabIndex = ui->tabWidget->tabBar()->tabAt(pos);
        QMenu *contextMenu = new QMenu(this);

        QAction *closeAction = new QAction("Close");
        contextMenu->addAction(closeAction);
        connect(closeAction, &QAction::triggered, this, [this, &tabIndex](bool checked) {
            Q_UNUSED(checked);

            ui->tabWidget->removeTab(tabIndex);
        });

        QMenu *closeMultipleAction = new QMenu("Close Multiple Tabs");

        QAction *closeAllAction = new QAction("Close All");
        closeMultipleAction->addAction(closeAllAction);
        connect(closeAllAction, &QAction::triggered, this, [this](bool checked) {
            Q_UNUSED(checked);

            ui->tabWidget->clear();
        });

        QAction *closeAllButAction = new QAction("Close All BUT This");
        closeMultipleAction->addAction(closeAllButAction);
        connect(closeAllButAction, &QAction::triggered, this, [this, &tabIndex](bool checked) {
            Q_UNUSED(checked);

            for (int i = 0; i < ui->tabWidget->count(); i++) {
                if (i != tabIndex) {
                    ui->tabWidget->removeTab(i);
                }
            }
        });

        QAction *closeLeftAction = new QAction("Close All to the Left");
        closeMultipleAction->addAction(closeLeftAction);
        connect(closeLeftAction, &QAction::triggered, this, [this, &tabIndex](bool checked) {
            Q_UNUSED(checked);

            for (int i = 0; i < tabIndex; i++) {
                ui->tabWidget->removeTab(i);
            }
        });

        QAction *closeRightAction = new QAction("Close All to the Right");
        closeMultipleAction->addAction(closeRightAction);
        connect(closeRightAction, &QAction::triggered, this, [this, &tabIndex](bool checked) {
            Q_UNUSED(checked);

            for (int i = tabIndex + 1; i < ui->tabWidget->count(); i++) {
                ui->tabWidget->removeTab(i);
            }
        });

        contextMenu->addMenu(closeMultipleAction);

        QPoint pt(pos);
        contextMenu->exec(ui->tabWidget->mapToGlobal(pt));

        delete contextMenu;
    });

    connect(ui->tabWidget, &QTabWidget::tabCloseRequested, this, [this](int index) {
        ui->tabWidget->removeTab(index);
    });

    connect(mTreeWidget, &XTreeWidget::Cleared, this, [this]() {
        ui->tabWidget->clear();
    });

    connect(mTreeWidget, &XTreeWidget::ItemSelected, this, [this](const QString itemText) {
        Q_UNUSED(itemText);

        auto* item = static_cast<XTreeWidgetItem*>(mTreeWidget->currentItem());
        if (!item) return;

        const QString kind = item->data(0, Qt::UserRole + 1).toString();
        if (kind != "INSTANCE") {
            // Clicking categories/subcategories does nothing (or you can show a summary panel)
            return;
        }

        const QString typeName = item->data(0, Qt::UserRole + 2).toString();
        const QVariantMap vars = item->data(0, Qt::UserRole + 3).toMap();

        // Prevent dup tabs
        const QString tabTitle = item->text(0);
        for (int i = 0; i < ui->tabWidget->count(); i++) {
            if (ui->tabWidget->tabText(i) == tabTitle) {
                ui->tabWidget->setCurrentIndex(i);
                return;
            }
        }

        // Check if this item has a preview (image data)
        if (vars.contains("_preview")) {
            const QVariantMap preview = vars.value("_preview").toMap();
            const QString filename = preview.value("filename").toString();
            const QByteArray data = preview.value("data").toByteArray();

            if (!data.isEmpty()) {
                auto* imageWidget = new ImagePreviewWidget(ui->tabWidget);
                imageWidget->setProperty("PARENT_NAME", tabTitle);
                imageWidget->setFilename(filename);

                // Determine format from filename
                QString format;
                if (filename.toLower().endsWith(".tga")) format = "TGA";
                else if (filename.toLower().endsWith(".dds")) format = "DDS";
                else if (filename.toLower().endsWith(".png")) format = "PNG";
                else if (filename.toLower().endsWith(".jpg") || filename.toLower().endsWith(".jpeg")) format = "JPG";

                imageWidget->loadFromData(data, format);

                ui->tabWidget->addTab(imageWidget, tabTitle);
                ui->tabWidget->setCurrentWidget(imageWidget);
                return;
            }
        }

        const TypeDef& td = mTypeRegistry.module().types[typeName];
        const auto schema = buildUiSchemaForType(td);

        auto* w = new ScriptTypeEditorWidget(typeName, schema, ui->tabWidget);
        w->setProperty("PARENT_NAME", tabTitle);
        w->setValues(vars); // optional, but this is "generation + populate" and still no saving

        ui->tabWidget->addTab(w, tabTitle);
        ui->tabWidget->setCurrentWidget(w);
    });

    connect(mTreeWidget, &XTreeWidget::ItemClosed, this, [this](const QString itemText) {
        for (int i = 0; i < ui->tabWidget->count(); i++) {
            const QString parentName = ui->tabWidget->widget(i)->property("PARENT_NAME").toString();
            if (parentName == itemText) {
                ui->tabWidget->removeTab(i);
                break;
            }
        }
    });


    QDockWidget *treeDockWidget = new QDockWidget(this);
    treeDockWidget->setWidget(mTreeWidget);
    treeDockWidget->setWindowTitle("Tree Browser");
    addDockWidget(Qt::LeftDockWidgetArea, treeDockWidget);

    QDockWidget *logDockWidget = new QDockWidget(this);
    logDockWidget->setWidget(mLogWidget);
    logDockWidget->setWindowTitle("Logs");
    addDockWidget(Qt::BottomDockWidgetArea, logDockWidget);

    // ========== Create Actions ==========

    // File menu actions
    actionNew = new QAction(QIcon::fromTheme("document-new"), "New", this);
    actionOpen = new QAction(QIcon::fromTheme("document-open"), "Open", this);
    actionOpenFolder = new QAction(QIcon::fromTheme("folder-open"), "Open Folder", this);
    actionSave = new QAction(QIcon::fromTheme("document-save"), "Save", this);
    actionSaveAs = new QAction(QIcon::fromTheme("document-save-as"), "Save As", this);

    // Edit menu actions
    actionUndo = new QAction(QIcon::fromTheme("edit-undo"), "Undo", this);
    actionRedo = new QAction(QIcon::fromTheme("edit-redo"), "Redo", this);
    actionCut = new QAction(QIcon::fromTheme("edit-cut"), "Cut", this);
    actionCopy = new QAction(QIcon::fromTheme("edit-copy"), "Copy", this);
    actionPaste = new QAction(QIcon::fromTheme("edit-paste"), "Paste", this);
    actionRename = new QAction(QIcon::fromTheme("edit-rename"), "Rename", this);
    actionDelete = new QAction(QIcon::fromTheme("edit-delete"), "Delete", this);
    actionFind = new QAction(QIcon::fromTheme("edit-find"), "Find", this);
    actionClearUndoHistory = new QAction(QIcon::fromTheme("edit-clear"), "Clear Undo History", this);
    actionPreferences = new QAction(QIcon::fromTheme("preferences-system"), "Preferences...", this);

    // Tools menu actions
    actionRunTests = new QAction(QIcon::fromTheme("system-run"), "Run Tests", this);

    // Help menu actions
    actionAbout = new QAction(QIcon::fromTheme("help-about"), "About", this);
    actionCheckForUpdates = new QAction(QIcon::fromTheme("system-software-update"), "Check for Updates", this);
    actionReportIssue = new QAction(QIcon::fromTheme("tools-report-bug"), "Report Issue", this);

    // Toolbar actions
    actionReparse = new QAction(QIcon::fromTheme("view-refresh"), "Reparse", this);
    actionReparse->setToolTip("Reload definitions and reparse open files");

    // ========== Add Actions to Menus ==========

    ui->MenuDef->addAction(actionNew);
    ui->MenuDef->addSeparator();
    ui->MenuDef->addAction(actionOpen);
    ui->MenuDef->addAction(actionOpenFolder);
    ui->MenuDef->addSeparator();
    ui->MenuDef->addAction(actionSave);
    ui->MenuDef->addAction(actionSaveAs);

    ui->menuEdit->addAction(actionUndo);
    ui->menuEdit->addAction(actionRedo);
    ui->menuEdit->addSeparator();
    ui->menuEdit->addAction(actionCut);
    ui->menuEdit->addAction(actionCopy);
    ui->menuEdit->addAction(actionPaste);
    ui->menuEdit->addAction(actionRename);
    ui->menuEdit->addAction(actionDelete);
    ui->menuEdit->addSeparator();
    ui->menuEdit->addAction(actionFind);
    ui->menuEdit->addSeparator();
    ui->menuEdit->addAction(actionClearUndoHistory);
    ui->menuEdit->addSeparator();
    ui->menuEdit->addAction(actionPreferences);

    ui->menuTools->addAction(actionRunTests);

    ui->menuHelp->addAction(actionAbout);
    ui->menuHelp->addAction(actionCheckForUpdates);
    ui->menuHelp->addAction(actionReportIssue);

    // ========== Add Actions to Toolbar ==========

    ui->toolBar->addAction(actionNew);
    ui->toolBar->addAction(actionOpen);
    ui->toolBar->addAction(actionOpenFolder);
    ui->toolBar->addAction(actionSave);
    ui->toolBar->addSeparator();
    ui->toolBar->addAction(actionCut);
    ui->toolBar->addAction(actionCopy);
    ui->toolBar->addAction(actionPaste);
    ui->toolBar->addSeparator();
    ui->toolBar->addAction(actionFind);
    ui->toolBar->addSeparator();
    ui->toolBar->addAction(actionReparse);

    // ========== Connect Action Signals ==========

    // File menu connections (placeholder - implement as needed)
    connect(actionNew, &QAction::triggered, this, []() {
        // TODO: Implement New action
    });

    connect(actionOpen, &QAction::triggered, this, [this]() {
        // Build filter string from loaded definitions
        QMap<QString, QString> exts = mTypeRegistry.supportedExtensions();

        QStringList filterParts;
        QStringList allExts;

        for (auto it = exts.begin(); it != exts.end(); ++it) {
            const QString& ext = it.key();
            const QString& displayName = it.value();
            filterParts.append(QString("%1 (*.%2)").arg(displayName, ext));
            allExts.append(QString("*.%1").arg(ext));
        }

        // Sort filters alphabetically by display name
        filterParts.sort(Qt::CaseInsensitive);

        // Add "All Supported Files" at the beginning
        QString allFilter = QString("All Supported Files (%1)").arg(allExts.join(" "));
        filterParts.prepend(allFilter);

        // Add "All Files" at the end
        filterParts.append("All Files (*)");

        QString filter = filterParts.join(";;");

        QStringList filePaths = QFileDialog::getOpenFileNames(
            this,
            "Open File",
            QString(),
            filter
        );

        for (const QString& path : filePaths) {
            const QString fileName = QFileInfo(path).fileName();

            QFile inputFile(path);
            if (!inputFile.open(QIODevice::ReadOnly)) {
                LogManager::instance().addError(QString("Failed to open: %1").arg(path));
                continue;
            }

            LogManager::instance().addEntry(QString("[FILE] Analyzing: %1").arg(fileName));

            const QString rootType = mTypeRegistry.chooseType(&inputFile, path);
            LogManager::instance().addEntry(QString("[FILE] Matched type '%1' for file: %2").arg(rootType).arg(fileName));

            if (rootType.isEmpty()) {
                LogManager::instance().addError(QString("No matching definition for: %1").arg(path));
                continue;
            }

            inputFile.seek(0);
            LogManager::instance().addLine();
            LogManager::instance().addEntry(QString("========== PARSING %1 ==========").arg(fileName));
            LogManager::instance().addLine();

            const qint64 fileSize = inputFile.size();
            QProgressDialog progress(QString("Parsing %1...").arg(fileName), "Cancel", 0, static_cast<int>(fileSize), this);
            progress.setWindowModality(Qt::WindowModal);
            progress.setMinimumDuration(500);

            QVariantMap rootVars;
            try {
                rootVars = mTypeRegistry.parse(rootType, &inputFile, path, [this, &progress](qint64 pos, qint64 size) {
                    progress.setValue(static_cast<int>(pos));
                    QApplication::processEvents();
                });
            } catch (const std::exception& e) {
                LogManager::instance().addLine();
                LogManager::instance().addError(QString("========== PARSE ERROR in %1 ==========").arg(fileName));
                LogManager::instance().addError(QString("Error: %1").arg(e.what()));
                LogManager::instance().addError(QString("File position: 0x%1").arg(inputFile.pos(), 0, 16));
                LogManager::instance().addLine();
                QMessageBox::critical(this, "Parse Error",
                                      QString("Failed to parse %1:\n\n%2").arg(fileName).arg(e.what()));
                continue;
            }

            LogManager::instance().addLine();
            LogManager::instance().addEntry(QString("========== FINISHED %1 ==========").arg(fileName));
            LogManager::instance().addLine();

            if (!mOpenedFilePaths.contains(path)) {
                mOpenedFilePaths.append(path);
            }

            XTreeWidgetItem* cat = ensureTypeCategoryRoot(rootType);
            auto* rootInst = addInstanceNode(cat, fileName, rootType, rootVars);
            routeNestedObjects(rootInst, rootVars);

            cat->setExpanded(true);
            mTreeWidget->setCurrentItem(rootInst);
        }
    });

    connect(actionOpenFolder, &QAction::triggered, this, []() {
        // TODO: Implement Open Folder action
    });

    connect(actionSave, &QAction::triggered, this, []() {
        // TODO: Implement Save action
    });

    connect(actionSaveAs, &QAction::triggered, this, []() {
        // TODO: Implement Save As action
    });

    // Edit menu connections
    connect(actionPreferences, &QAction::triggered, this, [this]() {
        PreferenceEditor *prefEditor = new PreferenceEditor(this);
        prefEditor->exec();
        prefEditor->close();
        delete prefEditor;
    });

    // Tools menu connections
    connect(actionRunTests, &QAction::triggered, this, []() {
        // TODO: Implement Run Tests action
    });

    // Help menu connections
    connect(actionAbout, &QAction::triggered, this, [this]() {
        AboutDialog *aboutDialog = new AboutDialog(this);
        aboutDialog->exec();
        delete aboutDialog;
    });

    connect(actionReportIssue, &QAction::triggered, this, [this]() {
        ReportIssueDialog issueDialog("https://git.redline.llc", "njohnson", "XPlor",
                                      "4738c4d2efd123efac1506c68c59b285c646df9f", this);
        issueDialog.exec();
    });

    // Reparse action connection
    connect(actionReparse, &QAction::triggered, this, [this]() {
        if (mOpenedFilePaths.isEmpty()) {
            QMessageBox::information(this, "Reparse", "No files to reparse. Drag and drop files first.");
            return;
        }

        LogManager::instance().addLine();
        LogManager::instance().addEntry("[REPARSE] Reloading definitions and reparsing files...");

        // Store file paths before clearing
        QStringList filesToReparse = mOpenedFilePaths;

        // Clear everything
        Reset();
        mOpenedFilePaths.clear();

        // Clear and reload type registry
        mTypeRegistry = TypeRegistry();
        LoadDefinitions();

        LogManager::instance().addEntry(QString("[REPARSE] Definitions reloaded, reparsing %1 file(s)...").arg(filesToReparse.size()));

        // Reparse each file
        for (const QString& path : filesToReparse) {
            QFile inputFile(path);
            if (!inputFile.open(QIODevice::ReadOnly)) {
                LogManager::instance().addError(QString("[REPARSE] Failed to open: %1").arg(path));
                continue;
            }

            const QString fileName = QFileInfo(path).fileName();
            LogManager::instance().addEntry(QString("[FILE] Analyzing: %1").arg(fileName));

            const QString rootType = mTypeRegistry.chooseType(&inputFile, path);
            LogManager::instance().addEntry(QString("[FILE] Matched type '%1' for file: %2").arg(rootType).arg(fileName));

            if (rootType.isEmpty()) {
                LogManager::instance().addError(QString("No matching definition for: %1").arg(path));
                continue;
            }

            inputFile.seek(0);
            LogManager::instance().addLine();
            LogManager::instance().addEntry(QString("========== PARSING %1 ==========").arg(fileName));
            LogManager::instance().addLine();

            const qint64 fileSize = inputFile.size();
            QProgressDialog progress(QString("Parsing %1...").arg(fileName), "Cancel", 0, static_cast<int>(fileSize), this);
            progress.setWindowModality(Qt::WindowModal);
            progress.setMinimumDuration(500);

            QVariantMap rootVars;
            try {
                rootVars = mTypeRegistry.parse(rootType, &inputFile, path, [this, &progress](qint64 pos, qint64 size) {
                    progress.setValue(static_cast<int>(pos));
                    QApplication::processEvents();
                });
            } catch (const std::exception& e) {
                LogManager::instance().addLine();
                LogManager::instance().addError(QString("========== PARSE ERROR in %1 ==========").arg(fileName));
                LogManager::instance().addError(QString("Error: %1").arg(e.what()));
                LogManager::instance().addError(QString("File position: 0x%1").arg(inputFile.pos(), 0, 16));
                LogManager::instance().addLine();
                continue;
            }

            LogManager::instance().addLine();
            LogManager::instance().addEntry(QString("========== FINISHED %1 ==========").arg(fileName));
            LogManager::instance().addLine();

            // Track this file again
            mOpenedFilePaths.append(path);

            // Rebuild tree
            XTreeWidgetItem* cat = ensureTypeCategoryRoot(rootType);
            auto* rootInst = addInstanceNode(cat, fileName, rootType, rootVars);
            routeNestedObjects(rootInst, rootVars);
            cat->setExpanded(true);
        }

        LogManager::instance().addLine();
        LogManager::instance().addEntry("[REPARSE] Reparse complete!");
        statusBar()->showMessage("Reparse complete!", 3000);
    });

    Reset();

    LoadDefinitions();
    //LoadTreeCategories();
}

MainWindow::~MainWindow()
{
    delete ui;
}

QString MainWindow::pluralizeType(const QString& typeName) {
    // simple: FastFile -> FastFiles, ZoneFile -> ZoneFiles
    // you can replace with nicer display names later
    const auto& mod = mTypeRegistry.module();
    const auto it = mod.types.find(typeName);
    QString groupLabel = (it != mod.types.end() && !it->display.isEmpty())
                             ? it->display
                             : typeName;
    return groupLabel + "s";
}

XTreeWidgetItem* MainWindow::ensureTypeCategoryRoot(const QString& typeName) {
    if (mTypeCategoryRoots.contains(typeName))
        return mTypeCategoryRoots[typeName];

    auto* root = new XTreeWidgetItem(mTreeWidget);
    root->setText(0, pluralizeType(typeName));
    root->setData(0, Qt::UserRole + 1, "CATEGORY");
    root->setData(0, Qt::UserRole + 2, typeName); // category's type
    mTreeWidget->addTopLevelItem(root);

    mTypeCategoryRoots.insert(typeName, root);
    return root;
}

void MainWindow::LoadDefinitions()
{
    const QString definitionsDir = QCoreApplication::applicationDirPath() + "/definitions/";
    QDirIterator it(definitionsDir, {"*.xscript"}, QDir::Files, QDirIterator::Subdirectories);

    while (it.hasNext()) {
        const QString path = it.next();
        const QString fileName = QFileInfo(path).fileName();
        QFile f(path);
        if (!f.open(QIODevice::ReadOnly)) {
            LogManager::instance().addError(QString("[DEF] Failed to open definition file: %1").arg(fileName));
            continue;
        }
        try {
            mTypeRegistry.ingestScript(QString::fromUtf8(f.readAll()), path);
            LogManager::instance().addEntry(QString("[DEF] Loaded definition: %1").arg(fileName));
        } catch (const std::exception& e) {
            LogManager::instance().addError(QString("[DEF] ERROR loading %1: %2").arg(fileName).arg(e.what()));
        }
    }
    // Validate all type references after loading
    QStringList refErrors = mTypeRegistry.validateTypeReferences();
    for (const QString& err : refErrors) {
        LogManager::instance().addError(QString("[DEF] %1").arg(err));
    }
    if (!refErrors.isEmpty())
    {
        LogManager::instance().addError(QString("[DEF] Found %1 invalid type reference(s)").arg(refErrors.size()));
    }
}

void MainWindow::LoadTreeCategories()
{
    const Module& mod = mTypeRegistry.module();

    for (const QString& typeName : mod.types.keys()) {
        const TypeDef& td = mod.types[typeName];
        if (!td.isRoot) continue;

        auto* cat = new XTreeWidgetItem(mTreeWidget);
        cat->setText(0, typeName);               // or a nicer display name later
        cat->setData(0, Qt::UserRole, typeName); // store type name
        mTreeWidget->addTopLevelItem(cat);
    }
}

XTreeWidgetItem* MainWindow::addInstanceNode(XTreeWidgetItem* parent, const QString& displayName,
                                             const QString& typeName, const QVariantMap& vars)
{
    auto* inst = new XTreeWidgetItem(parent);
    inst->setText(0, displayName);
    inst->setData(0, Qt::UserRole + 1, "INSTANCE");
    inst->setData(0, Qt::UserRole + 2, typeName);
    inst->setData(0, Qt::UserRole + 3, vars);   // store the map for UI later
    parent->addChild(inst);
    inst->setExpanded(true);
    return inst;
}

QString MainWindow::instanceDisplayFor(const QVariantMap& obj,
                                       const QString& fallbackType,
                                       const QString& fallbackKey,
                                       std::optional<int> index)
{
    if (obj.contains("_zone_name")) {
        const QString s = obj.value("_zone_name").toString();
        if (!s.isEmpty()) return s;
    }
    if (obj.contains("_name")) {
        const QString s = obj.value("_name").toString();
        if (!s.isEmpty()) return s;
    }
    if (!fallbackType.isEmpty()) return fallbackType;

    if (!fallbackKey.isEmpty()) {
        if (index.has_value()) return QString("%1[%2]").arg(fallbackKey).arg(*index);
        return fallbackKey;
    }
    return QStringLiteral("<unnamed>");
}

void MainWindow::routeNestedObjects(XTreeWidgetItem* ownerInstanceNode, const QVariantMap& vars)
{
    for (auto it = vars.begin(); it != vars.end(); ++it) {
        const QString& key = it.key();
        const QVariant& v = it.value();

        // Skip internal/temporary variables (underscore prefix, except special ones)
        if (key.startsWith("_") && key != "_name" && key != "_type" && key != "_path" &&
            key != "_basename" && key != "_ext" && key != "_zone_name") {
            //LogManager::instance().addEntry(QString("[TREE] Skipping internal variable: key='%1'").arg(key));
            continue;
        }

        // child object
        if (v.typeId() == QMetaType::QVariantMap) {
            const QVariantMap child = v.toMap();

            // Skip hidden objects
            if (child.value("_hidden").toBool()) {
                //LogManager::instance().addEntry(QString("[TREE] Skipping hidden child object: key='%1'").arg(key));
                continue;
            }

            const QString childType = child.value("_type").toString();
            if (!childType.isEmpty()) {
                const QString childName = child.value("_name").toString();
                //LogManager::instance().addEntry(QString("[TREE] Adding single child: key='%1', type='%2', name='%3'")
                //    .arg(key)
                //    .arg(childType)
                //    .arg(childName));

                auto* subcat = ensureSubcategory(ownerInstanceNode, childType);

                const QString childDisplay = instanceDisplayFor(child, childType, key);
                auto* childInst = addInstanceNode(subcat, childDisplay, childType, child);
                routeNestedObjects(childInst, child);
            }
            continue;
        }

        // array of child objects (optional, but nice)
        if (v.typeId() == QMetaType::QVariantList) {
            // Check for skip marker (XScript convention: _skip_tree_<arrayname>)
            if (vars.contains("_skip_tree_" + key)) {
                //LogManager::instance().addEntry(QString("[TREE] Skipping array '%1' (has _skip_tree marker)").arg(key));
                continue;
            }

            const QVariantList list = v.toList();
            //LogManager::instance().addEntry(QString("[TREE] Processing array '%1' with %2 items")
            //    .arg(key)
            //    .arg(list.size()));

            for (int i = 0; i < list.size(); i++) {
                if (list[i].typeId() != QMetaType::QVariantMap) continue;
                const QVariantMap child = list[i].toMap();

                // Skip hidden objects
                if (child.value("_hidden").toBool()) {
                    continue;
                }

                const QString childType = child.value("_type").toString();
                if (childType.isEmpty()) continue;

                const QString childName = child.value("_name").toString();
                //LogManager::instance().addEntry(QString("[TREE] Adding array item #%1: type='%2', name='%3'")
                //    .arg(i)
                //    .arg(childType)
                //    .arg(childName));

                auto* subcat = ensureSubcategory(ownerInstanceNode, childType);

                const QString childDisplay = instanceDisplayFor(child, childType, it.key(), i);
                auto* childInst = addInstanceNode(subcat, childDisplay, childType, child);
                routeNestedObjects(childInst, child);
            }
            continue;
        }
    }
}

XTreeWidgetItem* MainWindow::ensureSubcategory(XTreeWidgetItem* instanceNode, const QString& childTypeName)
{
    const QString key = QString("SUBCAT:%1").arg(childTypeName);

    // Look for an existing subcategory child
    for (int i = 0; i < instanceNode->childCount(); i++) {
        auto* c = static_cast<XTreeWidgetItem*>(instanceNode->child(i));
        if (c->data(0, Qt::UserRole + 1).toString() == "SUBCATEGORY" &&
            c->data(0, Qt::UserRole + 2).toString() == childTypeName)
        {
            return c;
        }
    }

    auto* sub = new XTreeWidgetItem(instanceNode);
    sub->setText(0, pluralizeType(childTypeName));
    sub->setData(0, Qt::UserRole + 1, "SUBCATEGORY");
    sub->setData(0, Qt::UserRole + 2, childTypeName);
    instanceNode->addChild(sub);
    sub->setExpanded(true);
    return sub;
}

void MainWindow::Reset() {
    // Clear the tree widget
    mTreeWidget->clear();

    // Clear category roots hash
    mTypeCategoryRoots.clear();

    // Clear tabs
    ui->tabWidget->clear();
}

void MainWindow::HandleLogEntry(const QString &entry) {
    QString logContents = mLogWidget->toPlainText() + "\n" + entry;
    if (mLogWidget->toPlainText().isEmpty()) {
        logContents = entry;
    }
    mLogWidget->setPlainText(logContents);
    mLogWidget->moveCursor(QTextCursor::End);
}

void MainWindow::HandleStatusUpdate(const QString &message, int timeout) {
    statusBar()->showMessage(message, timeout);
    mProgressBar->setVisible(false); // Hide progress bar if just a message
}

void MainWindow::HandleProgressUpdate(const QString &message, int progress, int max) {
    mProgressBar->setMaximum(max);
    mProgressBar->setValue(progress);
    mProgressBar->setVisible(true);

    QString progressText = QString("%1 (%2/%3)").arg(message).arg(progress).arg(max);
    statusBar()->showMessage(progressText);
}

void MainWindow::dragEnterEvent(QDragEnterEvent *event) {
    const QMimeData *mimeData = event->mimeData();
    if (mimeData->hasUrls()) {
        event->acceptProposedAction();
    }
}

void MainWindow::dragMoveEvent(QDragMoveEvent *event) {
    Q_UNUSED(event);
}

void MainWindow::dragLeaveEvent(QDragLeaveEvent *event) {
    Q_UNUSED(event);
}

void MainWindow::dropEvent(QDropEvent *event) {
    const QMimeData *mimeData = event->mimeData();
    if (!mimeData->hasUrls()) {
        ui->statusBar->showMessage("Can't display dropped data!");
        return;
    }

    for (const QUrl& url : mimeData->urls()) {
        const QString path = url.toLocalFile();
        const QString fileName = QFileInfo(path).fileName();

        QFile inputFile(path);
        if (!inputFile.open(QIODevice::ReadOnly))
            continue;

        LogManager::instance().addEntry(QString("[FILE] Analyzing: %1").arg(fileName));


        // Type matching via XScript definitions
        const QString rootType = mTypeRegistry.chooseType(&inputFile, path);
        LogManager::instance().addEntry(QString("[FILE] Matched type '%1' for file: %2").arg(rootType).arg(fileName));
        if (rootType.isEmpty()) {
            LogManager::instance().addError(QString("No matching definition for: %1").arg(path));
            continue;
        }


        inputFile.seek(0);
        LogManager::instance().addLine();
        LogManager::instance().addEntry(QString("========== PARSING %1 ==========").arg(fileName));
        LogManager::instance().addLine();

        const qint64 fileSize = inputFile.size();
        QProgressDialog progress(QString("Parsing %1...").arg(fileName), "Cancel", 0, static_cast<int>(fileSize), this);
        progress.setWindowModality(Qt::WindowModal);
        progress.setMinimumDuration(500);

        QVariantMap rootVars;
        try {
            rootVars = mTypeRegistry.parse(rootType, &inputFile, path, [this, &progress](qint64 pos, qint64 size) {
                progress.setValue(static_cast<int>(pos));
                QApplication::processEvents();
            });
        } catch (const std::exception& e) {
            LogManager::instance().addLine();
            LogManager::instance().addError(QString("========== PARSE ERROR in %1 ==========").arg(fileName));
            LogManager::instance().addError(QString("Error: %1").arg(e.what()));
            LogManager::instance().addError(QString("File position: 0x%1").arg(inputFile.pos(), 0, 16));
            LogManager::instance().addLine();
            QMessageBox::critical(this, "Parse Error",
                                  QString("Failed to parse %1:\n\n%2").arg(fileName).arg(e.what()));
            continue;
        }

        LogManager::instance().addLine();
        LogManager::instance().addEntry(QString("========== FINISHED %1 ==========").arg(fileName));
        LogManager::instance().addLine();

        // Track this file for reparsing
        if (!mOpenedFilePaths.contains(path)) {
            mOpenedFilePaths.append(path);
        }

        // Ensure top-level category exists (it should, but safe)
        XTreeWidgetItem* cat = ensureTypeCategoryRoot(rootType);

        // Add instance under category (FastFiles -> test.ff)
        auto* rootInst = addInstanceNode(cat, fileName, rootType, rootVars);

        // Route nested objects as subcategories under the instance (test.ff -> ZoneFiles -> ...)
        routeNestedObjects(rootInst, rootVars);

        cat->setExpanded(true);
        mTreeWidget->setCurrentItem(rootInst);
    }
}