// SPDX-FileCopyrightText: 2024 Kåre Särs <kare.sars@iki.fi>
// SPDX-License-Identifier: LGPL-2.0-or-later

#include "template.h"
#include "ui_template.h"

#include <KLocalizedString>
#include <KMessageBox>

#include <QDir>
#include <QDirIterator>
#include <QFile>
#include <QFileDialog>
#include <QFileInfo>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QJsonParseError>
#include <QKeyEvent>
#include <QStandardPaths>
#include <QTemporaryDir>
#include <QtCore/qlogging.h>

using namespace Qt::Literals::StringLiterals;

static QString lastPath(const QString &path)
{
    QStringList paths = path.split('/'_L1, Qt::SkipEmptyParts);
    if (!paths.isEmpty()) {
        return paths.last();
    }
    return path;
}

static QString userTemplatePath()
{
    return QFileInfo(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation) + QLatin1String("/templates")).absoluteFilePath();
}

QVariant Template::TreeData::data(int role, int column)
{
    if (column != 0) {
        return {};
    }

    switch (role) {
    case Qt::DisplayRole:
        if (path == userTemplatePath()) {
            return i18n("User Templates");
        }
        return lastPath(path);
    case TreeData::PathRole:
        return path;
    case TreeData::ConfigJsonRole:
        return configFile;
    }

    return {};
}

QVariant Template::ConfigData::data(int role, int column)
{
    if (column < 0 || column > 1) {
        return {};
    }

    switch (role) {
    case Qt::DisplayRole:
    case Qt::EditRole:
        if (column == 0) {
            return m_desc;
        } else {
            return m_value;
        }
    case Qt::ToolTipRole:
        return i18n("This value must be lowercase");
    case Qt::BackgroundRole:
        if (column != 1) {
            return {};
        }
        return (m_mustBeLowercase && m_value.toLower() != m_value) || m_value.isEmpty() ? QBrush(Qt::red) : QVariant();
    case ConfigData::ReplaceDescRole:
        return m_desc;
    case ConfigData::ReplacePlaceHolderRole:
        return m_placeholder;
    case ConfigData::ReplaceValueRole:
        return m_value;
    case ConfigData::MustBeLowerCaseRole:
        return m_mustBeLowercase;
    case ConfigData::GeneratedFilesRole:
        return m_generatedFiles;
    }
    return {};
}

Qt::ItemFlags Template::ConfigData::flags(int column) const
{
    Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
    if (column == 1) {
        flags |= Qt::ItemIsEditable;
    }
    return flags;
}

bool Template::ConfigData::setData(const QVariant &value, int role, int column)
{
    if (role != Qt::EditRole) {
        return false;
    }
    if (column == 0) {
        // Only for the header data
        m_desc = value.toString();
        return true;
    }
    if (column == 1) {
        m_value = value.toByteArray();
        return true;
    }

    return false;
}

Template::Template(QWidget *parent)
    : QDialog(parent)
    , ui(new Ui::Template)
    , m_selectionModel(std::make_unique<TreeData>())
    , m_configModel(std::make_unique<ConfigData>())
    , m_categorySelector(this)
{
    setModal(true);
    ui->setupUi(this);

    m_createButton = new QPushButton(i18n("Create"));
    m_createButton->setEnabled(false);
    m_createButton->setDefault(true);
    ui->u_buttonBox->addButton(m_createButton, QDialogButtonBox::ActionRole);

    auto importButton = new QPushButton(QIcon::fromTheme(u"document-import"_s), i18n("Import..."), this);
    m_exportButton = new QPushButton(QIcon::fromTheme(u"document-export"_s), i18n("Export"), this);
    m_exportButton->setEnabled(false);

    m_removeButton = new QPushButton(QIcon::fromTheme(u"edit-delete"_s), i18n("Remove"), this);
    m_removeButton->setEnabled(false);
    connect(m_removeButton, &QPushButton::clicked, this, &Template::removeTemplate);

    auto bottomLayout = new QHBoxLayout();
    bottomLayout->setContentsMargins(0, 0, 0, 0);

    bottomLayout->addWidget(importButton);
    bottomLayout->addWidget(m_exportButton);
    bottomLayout->addWidget(m_removeButton);
    bottomLayout->addStretch();
    bottomLayout->addWidget(ui->u_buttonBox);

    if (auto mainLayout = qobject_cast<QBoxLayout *>(layout())) {
        mainLayout->addLayout(bottomLayout);
    }

    connect(importButton, &QPushButton::clicked, this, &Template::importTemplate);
    connect(m_createButton, &QPushButton::clicked, this, &Template::createFromTemplate);
    connect(ui->u_buttonBox, &QDialogButtonBox::rejected, this, &Template::cancel);
    connect(m_exportButton, &QPushButton::clicked, this, &Template::exportTemplate);

    ui->u_templateTree->setHeaderHidden(true);
    ui->u_templateTree->setModel(&m_selectionModel);

    ui->u_configTreeView->setRootIsDecorated(false);
    ui->u_configTreeView->setModel(&m_configModel);

    connect(ui->u_templateTree->selectionModel(), &QItemSelectionModel::currentChanged, this, &Template::templateIndexChanged);

    m_configModel.setHeaderData(0, Qt::Horizontal, u"Property"_s);
    m_configModel.setHeaderData(1, Qt::Horizontal, u"Value"_s);

    ui->u_configWidget->setEnabled(false);

    connect(&m_configModel, &AbstractDataModel::dataChanged, this, &Template::checkIfConfigIsReady);
    connect(ui->u_locationLineEdit, &QLineEdit::textChanged, this, &Template::checkIfConfigIsReady);

    connect(ui->u_locationToolButton, &QToolButton::clicked, this, &Template::selectFolder);

    // Add the templates to the model
    addEntries(QFileInfo(u":/templates"_s), QModelIndex());
#ifdef BUILD_APPWIZARD
    addAppWizardTemplates();
#endif
    // Add user templates if they exist
    QString userTemplates = userTemplatePath();
    const QDir userTemplDir(userTemplates);
    const auto userEntries = userTemplDir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
    if (!userEntries.isEmpty()) {
        std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
        treeData->path = userTemplates;
        const QModelIndex userTempatesIndex = m_selectionModel.addChild(std::move(treeData), QModelIndex());
        addEntries(QFileInfo(userTemplates), userTempatesIndex);
    }
}

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

QModelIndex Template::findChildIndex(const QString &folderName, const QModelIndex &parent)
{
    int rows = m_selectionModel.rowCount(parent);

    for (int i = 0; i < rows; ++i) {
        const QModelIndex idx = m_selectionModel.index(i, 0, parent);
        const QString path = idx.data(TreeData::PathRole).toString();
        if (path == folderName) {
            return idx;
        }
    }
    return QModelIndex();
}

QModelIndex Template::addUserTemplateEntry(const QFileInfo &info)
{
    const QString root = userTemplatePath();
    QString templatePath = info.absoluteFilePath();
    ;
    templatePath.remove(root);

    QStringList pathParts = templatePath.split('/'_L1, Qt::SplitBehaviorFlags::SkipEmptyParts);
    QModelIndex idx = findChildIndex(root, QModelIndex());

    if (!idx.isValid()) {
        // The path is not found. Create the node
        std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
        treeData->path = root;
        idx = m_selectionModel.addChild(std::move(treeData), QModelIndex());
    }

    QString currentPath = root;
    while (pathParts.size() > 0) {
        auto path = pathParts.takeFirst();
        currentPath += '/'_L1 + path;

        auto childIndex = findChildIndex(currentPath, idx);
        if (!childIndex.isValid()) {
            // The path is not found. Create the node
            std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
            treeData->path = currentPath;
            if (pathParts.isEmpty()) {
                // This is the template folder
                treeData->configFile = u"template.json"_s;
            }
            childIndex = m_selectionModel.addChild(std::move(treeData), idx);
        }
        idx = childIndex;
    }
    return idx;
}

void Template::addEntries(const QFileInfo &info, const QModelIndex &parent)
{
    QDir dir(info.absoluteFilePath());
    const QStringList files = dir.entryList(QDir::Files | QDir::Hidden);
    if (files.contains(u"template.json"_s)) {
        std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
        treeData->path = parent.data(TreeData::PathRole).toString();
        treeData->configFile = u"template.json"_s;
        m_selectionModel.setAbstractData(std::move(treeData), parent);
        return;
    }
    const auto entries = dir.entryInfoList(QDir::Dirs | QDir::NoDotAndDotDot);
    for (const auto &entry : entries) {
        std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
        treeData->path = entry.absoluteFilePath();
        const QModelIndex cIndex = m_selectionModel.addChild(std::move(treeData), parent);
        addEntries(entry, cIndex);
    }
}

QStringList Template::fileNames(const QString &src)
{
    QDir dir(src);
    QStringList files = dir.entryList(QDir::Files | QDir::Hidden);
    const auto entries = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);

    for (const auto &entry : entries) {
        files += fileNames(src + '/'_L1 + entry);
    }

    return files;
}

QString Template::copyFile(const QString &src, const QString &trgt, const ReplaceMap &fileReplaceMap, const ReplaceMap &replaceMap)
{
    QFile in(src);
    if (!in.open(QFile::ReadOnly)) {
        return i18n("Failed to open file to copy: %1", src);
    }

    QByteArray fileContent = in.readAll();

    QByteArray newName = trgt.toLocal8Bit();
    // Replace first any file names
    for (auto it = fileReplaceMap.cbegin(); it != fileReplaceMap.cend(); ++it) {
        newName.replace(it.key(), it.value());
        fileContent.replace(it.key(), it.value());
    }

    // Now replace non-file-name
    for (auto it = replaceMap.cbegin(); it != replaceMap.cend(); ++it) {
        QByteArray toReplace = it.key();
        newName.replace(toReplace, it.value());
        fileContent.replace(toReplace, it.value());
    }

    if (QFileInfo::exists(QString::fromLocal8Bit(newName))) {
        return i18n("File already exists: %1", QString::fromUtf8(newName));
    }

    QFile out(QString::fromLocal8Bit(newName));
    if (!out.open(QFile::WriteOnly)) {
        return i18n("Failed to create: %1", QString::fromUtf8(newName));
    }

    out.write(fileContent);
    return QString();
}

QString
Template::copyFolder(const QString &src, const QString &trgt, const ReplaceMap &fileReplaceMap, const ReplaceMap &replaceMap, const QStringList &fileSkipList)
{
    QDir dir(src);

    // Copy files
    const auto fileEntries = dir.entryList(QDir::Files | QDir::Hidden);
    for (const auto &entry : fileEntries) {
        if (fileSkipList.contains(entry)) {
            continue;
        }

#ifdef BUILD_APPWIZARD
        if (entry == u"CMakeLists.txt"_s && trgt == ui->u_locationLineEdit->text()) {
            m_hasCMakeLists = true;
        }
        if (entry == u".kateproject"_s && trgt == ui->u_locationLineEdit->text()) {
            m_hasKateproject = true;
        }
#endif
        const QString copyError = copyFile(src + '/'_L1 + entry, trgt + '/'_L1 + entry, fileReplaceMap, replaceMap);
        if (!copyError.isEmpty()) {
            return copyError;
        }
    }

    // Copy folders
    const auto dirEntries = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot);
    for (const auto &entry : dirEntries) {
        QDir().mkpath(trgt + '/'_L1 + entry);
        const QString copyError = copyFolder(src + '/'_L1 + entry, trgt + '/'_L1 + entry, fileReplaceMap, replaceMap, fileSkipList);
        if (!copyError.isEmpty()) {
            return copyError;
        }
    }

    return QString();
}

void Template::createFromTemplate()
{
#ifdef BUILD_APPWIZARD
    QString path = ui->u_templateTree->currentIndex().data(TreeData::PathRole).toString();
    QString config = ui->u_templateTree->currentIndex().data(TreeData::ConfigJsonRole).toString();
    if (!config.endsWith(u"json"_s)) {
        createFromAppWizardTemplate(path);
        return;
    }
#endif

    ReplaceMap replaceMap;
    ReplaceMap fileReplaceMap;
    int rows = m_configModel.rowCount(QModelIndex());

    const auto tmplIndex = ui->u_templateTree->currentIndex();
    QString srcPath = tmplIndex.data(TreeData::PathRole).toString();
    const QStringList fNames = fileNames(srcPath);

    QString fileToOpen = m_fileToOpen;
    bool lcFiles = ui->u_lowercaseCheckBox->isChecked();

    for (int i = 0; i < rows; ++i) {
        const auto index = m_configModel.index(i, 0, QModelIndex());
        const QByteArray plh = index.data(ConfigData::ReplacePlaceHolderRole).toByteArray();
        const QByteArray val = index.data(ConfigData::ReplaceValueRole).toByteArray();
        const QStringList genFiles = index.data(ConfigData::GeneratedFilesRole).toStringList();
        replaceMap.insert(plh, val);
        QByteArray fileNameReplace = lcFiles ? val.toLower() : val;

        // Add filename replacements (lowercase of class name)
        for (const auto &fileStr : fNames) {
            const QByteArray file = fileStr.toLocal8Bit();
            if (file.contains(plh)) {
                fileToOpen.replace(QString::fromLocal8Bit(plh), QString::fromLocal8Bit(fileNameReplace));
                QByteArray newName = file;
                newName.replace(plh, fileNameReplace);
                fileReplaceMap.insert(file, newName);
            }
        }

        // Add file-name replacements for generated files (lowercase of class name)
        for (const QString &genFile : genFiles) {
            const QByteArray toReplace = genFile.arg(QString::fromLocal8Bit(plh)).toLocal8Bit();
            const QByteArray replacement = genFile.arg(QString::fromLocal8Bit(fileNameReplace)).toLocal8Bit();
            fileReplaceMap.insert(toReplace, replacement);
        }
    }

    QString trgtPath = ui->u_locationLineEdit->text();
    fileToOpen = trgtPath + '/'_L1 + fileToOpen;

    QStringList fileSkipList({u"template.json"_s});

    QString errorStr = copyFolder(srcPath, trgtPath, fileReplaceMap, replaceMap, fileSkipList);

    if (errorStr.isEmpty()) {
        Q_EMIT templateCopied(fileToOpen);
        accept();
    } else {
        KMessageBox::error(this, errorStr);
    }
}

void Template::cancel()
{
    Q_EMIT templateCopied(QString());
    reject();
}

void Template::templateIndexChanged(const QModelIndex &newIndex)
{
    m_configModel.clear();
    m_fileToOpen.clear();
    ui->u_detailsTB->clear();
    ui->u_configWidget->setEnabled(false);

    m_exportButton->setEnabled(false);
    m_createButton->setEnabled(false);

    QString path = newIndex.data(TreeData::PathRole).toString();
    QString config = newIndex.data(TreeData::ConfigJsonRole).toString();

    if (!path.isEmpty() && !config.isEmpty() && path.startsWith(userTemplatePath())) {
        m_removeButton->setEnabled(true);
    } else {
        m_removeButton->setEnabled(false);
    }

    if (config.isEmpty()) {
        return;
    }

#ifdef BUILD_APPWIZARD
    if (!config.endsWith(u"json"_s)) {
        appWizardTemplateSelected(path);
        return;
    }
#endif

    QByteArray configJson;
    ui->u_lowercaseCheckBox->setEnabled(true);

    QFile in(path + '/'_L1 + config);
    if (in.open(QFile::ReadOnly)) {
        configJson = in.readAll();
    }

    QJsonParseError error;
    const QJsonDocument doc = QJsonDocument::fromJson(configJson, &error);
    if (error.error != QJsonParseError::NoError) {
        qWarning("%ls at: %d", qUtf16Printable(error.errorString()), error.offset);
    }
    const QJsonObject rootObj = doc.object();
    QString desc = rootObj.value(u"description"_s).toString();
    m_fileToOpen = rootObj.value(u"fileToOpen"_s).toString();

    ui->u_detailsTB->setText(desc);

    const QJsonArray replacements = rootObj.value(u"replacements"_s).toArray();

    for (const auto renameVal : replacements) {
        const auto renObj = renameVal.toObject();
        std::unique_ptr<ConfigData> configData = std::make_unique<ConfigData>();
        configData->m_desc = renObj.value(u"description"_s).toString();
        configData->m_placeholder = renObj.value(u"placeholder"_s).toString().toLocal8Bit();
        configData->m_value = renObj.value(u"default"_s).toString().toLocal8Bit();
        configData->m_mustBeLowercase = renObj.value(u"mustBeLowercase"_s).toBool(false);
        const auto files = renObj.value(u"genratedFiles"_s).toArray();
        for (const auto file : files) {
            configData->m_generatedFiles.append(file.toString());
        }
        m_configModel.addChild(std::move(configData), QModelIndex());
    }

    ui->u_configTreeView->resizeColumnToContents(0);
    ui->u_configTreeView->resizeColumnToContents(1);
    ui->u_configWidget->setEnabled(true);

    m_exportButton->setEnabled(true);
    checkIfConfigIsReady();
}

void Template::checkIfConfigIsReady()
{
    int rows = m_configModel.rowCount(QModelIndex());

    bool hasAllValues = true;
    for (int i = 0; i < rows; ++i) {
        if (m_configModel.index(i, 1, QModelIndex()).data().toString().isEmpty()) {
            hasAllValues = false;
            break;
        }
        bool lc = m_configModel.index(i, 1, QModelIndex()).data(ConfigData::MustBeLowerCaseRole).toBool();
        const QString val = m_configModel.index(i, 1, QModelIndex()).data(ConfigData::ReplaceValueRole).toString();
        if (lc && val != val.toLower()) {
            hasAllValues = false;
            break;
        }
    }
    QString folder = ui->u_locationLineEdit->text();
    bool hasFolder = !folder.isEmpty() && QDir().exists(folder);

    m_createButton->setEnabled(hasFolder && hasAllValues);
}

void Template::selectFolder()
{
    QString folder = QFileDialog::getExistingDirectory(this, i18n("Select target directory"), ui->u_locationLineEdit->text());
    if (!folder.isEmpty()) {
        ui->u_locationLineEdit->setText(folder);
    }
}

void Template::setOutputFolder(const QString &path)
{
    ui->u_locationLineEdit->setText(path);
}

#ifdef BUILD_APPWIZARD
void Template::addAppWizardTemplates()
{
    m_appWizMap = AppWizardReader().appWizardTemplates();

    if (m_appWizMap.isEmpty()) {
        return;
    }

    // create the appWiz root
    std::unique_ptr<TreeData> rootData = std::make_unique<TreeData>();
    rootData->path = i18n("KAppTemplates");
    QMap<QString, QModelIndex> indexes;
    indexes.insert(QString(), m_selectionModel.addChild(std::move(rootData), QModelIndex()));

    for (auto it = m_appWizMap.cbegin(); it != m_appWizMap.cend(); it++) {
        QStringList itemPaths = it.key().split(u'/');
        itemPaths.removeLast();
        QStringList paths;
        QModelIndex index = indexes.value(QString());
        for (const QString &part : std::as_const(itemPaths)) {
            paths.append(part);
            const QString path = paths.join(u'/');
            if (!indexes.contains(path)) {
                std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
                treeData->path = path;
                index = m_selectionModel.addChild(std::move(treeData), index);
                indexes.insert(path, index);
            } else {
                index = indexes.value(path);
            }
        }
        std::unique_ptr<TreeData> treeData = std::make_unique<TreeData>();
        treeData->path = it.key();
        treeData->configFile = it->packagePath;
        m_selectionModel.addChild(std::move(treeData), index);
    }
}

void Template::appWizardTemplateSelected(const QString &category)
{
    const auto &templ = m_appWizMap.value(category);
    ui->u_lowercaseCheckBox->setEnabled(false);

    ui->u_detailsTB->setText(templ.description);

    const auto replacements = AppWizardReader().replacements();
    for (const auto &ren : replacements) {
        std::unique_ptr<ConfigData> configData = std::make_unique<ConfigData>();
        configData->m_desc = ren.descr;
        configData->m_placeholder = ren.placeholder;
        configData->m_value = ren.defaultValue;
        configData->m_mustBeLowercase = false;
        // data->m_generatedFiles;
        m_configModel.addChild(std::move(configData), QModelIndex());
    }

    ui->u_configTreeView->resizeColumnToContents(0);
    ui->u_configTreeView->resizeColumnToContents(1);
    ui->u_configWidget->setEnabled(true);
}

void Template::createFromAppWizardTemplate(const QString &category)
{
    const auto &templ = m_appWizMap.value(category);

    QMap<QByteArray, QByteArray> replaceMap;
    int rows = m_configModel.rowCount(QModelIndex());

    for (int i = 0; i < rows; ++i) {
        const auto index = m_configModel.index(i, 0, QModelIndex());
        const QByteArray plh = index.data(ConfigData::ReplacePlaceHolderRole).toByteArray();
        const QByteArray val = index.data(ConfigData::ReplaceValueRole).toByteArray();
        replaceMap.insert(plh, val);
    }

    QString trgtPath = ui->u_locationLineEdit->text();
    QString fileToOpen = templ.fileToOpen;
    fileToOpen.replace(u"%{dest}"_s, trgtPath);
    if (!QFileInfo(fileToOpen).isAbsolute()) {
        fileToOpen = trgtPath + '/'_L1 + fileToOpen;
    }

    const QRegularExpression notWord(u"[^\\w]"_s);
    auto generateIdentifier = [&notWord](const QByteArray &appname) {
        return QString::fromLocal8Bit(appname).replace(notWord, u"_"_s).toLocal8Bit();
    };

    const QByteArray appName = replaceMap.value("%{APPNAME}"_ba);
    replaceMap["%{CURRENT_YEAR}"_ba] = QByteArray().setNum(QDate::currentDate().year());
    replaceMap["%{APPNAME}"_ba] = appName;
    replaceMap["%{APPNAMEUC}"_ba] = generateIdentifier(appName.toUpper());
    replaceMap["%{APPNAMELC}"_ba] = appName.toLower();
    replaceMap["%{APPNAMEID}"_ba] = generateIdentifier(appName);
    replaceMap["%{PROJECTDIR}"_ba] = trgtPath.toLocal8Bit();
    replaceMap["%{PROJECTDIRNAME}"_ba] = appName.toLower();

    // Update the file to open
    for (const auto &[key, value] : replaceMap.asKeyValueRange()) {
        fileToOpen.replace(QString::fromLocal8Bit(key), QString::fromLocal8Bit(value));
    }

    QStringList fileSkipList({templ.kAppTemplateFile, templ.icon});

    QTemporaryDir tempDir;

    m_hasCMakeLists = false;
    m_hasKateproject = false;

    QString errorStr = AppWizardReader().extractTemplateTo(templ.packagePath, tempDir.path());
    if (!errorStr.isEmpty()) {
        fileToOpen.clear();
        KMessageBox::error(this, errorStr);
        return;
    } else {
        errorStr = copyFolder(tempDir.path(), trgtPath, {}, replaceMap, fileSkipList);

        if (m_hasCMakeLists && !m_hasKateproject && errorStr.isEmpty()) {
            errorStr = copyFile(u":/templates/kateproject.in"_s, trgtPath + u"/.kateproject"_s, {}, replaceMap);
        }
    }

    if (errorStr.isEmpty()) {
        Q_EMIT templateCopied(fileToOpen);
        accept();
    } else {
        KMessageBox::error(this, errorStr);
    }
}
#endif

void Template::exportTemplate()
{
    const QModelIndex index = ui->u_templateTree->currentIndex();
    if (!index.isValid()) {
        return;
    }

    const QString sourcePath = index.data(TreeData::PathRole).toString();
    if (sourcePath.isEmpty()) {
        KMessageBox::error(this, i18n("Could not retrieve template path."));
        return;
    }

    const QString destDir = QFileDialog::getExistingDirectory(this, i18n("Export Template To"), QDir::homePath());
    if (destDir.isEmpty()) {
        return;
    }

    const QString fileName = QFileInfo(sourcePath).fileName();
    const QString finalDest = QDir(destDir).filePath(fileName);

    if (QFileInfo::exists(finalDest)) {
        KMessageBox::error(this, i18n("Folder '%1' already exists.\nAborting export.", finalDest), i18n("Export Failed"));
        return;
    }

    QDir().mkpath(finalDest);
    const QString errorStr = copyFolder(sourcePath, finalDest, ReplaceMap(), ReplaceMap(), QStringList());

    if (errorStr.isEmpty()) {
        KMessageBox::information(this, i18n("Template exported successfully to:\n%1", finalDest));
    } else {
        KMessageBox::error(this, errorStr);
    }
}

void Template::importTemplate()
{
    const QString srcDir = QFileDialog::getExistingDirectory(this,
                                                             i18n("Select Template Folder to Import"),
                                                             QDir::homePath(),
                                                             QFileDialog::ShowDirsOnly | QFileDialog::ReadOnly | QFileDialog::DontUseNativeDialog);
    if (srcDir.isEmpty()) {
        return;
    }

    QDir source(srcDir);

    if (!source.exists(u"template.json"_s)) {
        KMessageBox::error(this, i18n("The selected folder does not contain a valid template.json file."));
        return;
    }

    QFile jsonFile(source.filePath(u"template.json"_s));
    if (!jsonFile.open(QIODevice::ReadOnly)) {
        KMessageBox::error(this, i18n("Could not open template.json."));
        return;
    }

    QJsonParseError error;
    QJsonDocument doc = QJsonDocument::fromJson(jsonFile.readAll(), &error);
    jsonFile.close();

    if (error.error != QJsonParseError::NoError) {
        KMessageBox::error(this, i18n("Invalid JSON in template.json: %1", error.errorString()));
        return;
    }

    QJsonObject root = doc.object();

    if (root.contains(u"fileToOpen"_s)) {
        const QString fileToOpen = root.value(u"fileToOpen"_s).toString();
        if (!source.exists(fileToOpen)) {
            KMessageBox::error(this, i18n("Broken Template: The fileToOpen '%1' does not exist in the folder.", fileToOpen));
            return;
        }
    }

    if (!root.contains(u"replacements"_s)) {
        KMessageBox::error(this, i18n("Invalid Template: Missing mandatory 'replacements' tag in template.json."));
        return;
    }

    QSet<QString> unfoundPlaceholders;
    const QJsonArray replacements = root.value(u"replacements"_s).toArray();

    for (const auto &item : replacements) {
        if (!item.isObject()) {
            KMessageBox::error(this, i18n("Invalid Template: 'replacements' array contains invalid data."));
            return;
        }

        const QJsonObject replacement = item.toObject();

        if (!replacement.contains(u"description"_s) || !replacement.contains(u"placeholder"_s) || !replacement.contains(u"default"_s)) {
            KMessageBox::error(this, i18n("Invalid Template: A replacement object is missing required tags (description, placeholder, or default)."));
            return;
        }

        const QString placeholder = replacement.value(u"placeholder"_s).toString();

        if (placeholder.isEmpty()) {
            KMessageBox::error(this, i18n("Invalid Template: A placeholder string cannot be empty."));
            return;
        }

        unfoundPlaceholders.insert(placeholder);
    }

    if (!unfoundPlaceholders.isEmpty()) {
        QDirIterator it(srcDir, QDir::Files | QDir::NoDotAndDotDot, QDirIterator::Subdirectories);
        while (it.hasNext() && !unfoundPlaceholders.isEmpty()) {
            QString filePath = it.next();
            if (QFileInfo(filePath).fileName() == u"template.json"_s) {
                continue;
            }

            QFile f(filePath);
            if (f.open(QIODevice::ReadOnly | QIODevice::Text)) {
                QString content = QString::fromUtf8(f.readAll());
                for (auto i = unfoundPlaceholders.begin(); i != unfoundPlaceholders.end();) {
                    if (content.contains(*i)) {
                        i = unfoundPlaceholders.erase(i);
                    } else {
                        ++i;
                    }
                }
            }
        }

        if (!unfoundPlaceholders.isEmpty()) {
            QString missing = QStringList(unfoundPlaceholders.cbegin(), unfoundPlaceholders.cend()).join(u", ");
            KMessageBox::error(this, i18n("Broken Template: Placeholders defined but not used:\n%1", missing));
            return;
        }
    }

    const auto categoryOpt = m_categorySelector.getCategoryPath(source.dirName());
    if (!categoryOpt || categoryOpt->isEmpty()) {
        return;
    }
    const auto &categoryAndName = categoryOpt.value();

    const QString localTemplates = userTemplatePath();
    const QString destPath = QDir(localTemplates).filePath(categoryAndName);

    if (QFileInfo::exists(destPath)) {
        const QString name = lastPath(categoryAndName);
        QString category = categoryAndName;
        static QRegularExpression remNameRegExp;
        remNameRegExp.setPattern(u"/%1$"_s.arg(name));
        category.remove(remNameRegExp);
        const int ret =
            KMessageBox::warningContinueCancel(this,
                                               i18n("A template '%1' already exists in category '%2'.\nDo you want to overwrite it?", name, category),
                                               i18n("Overwrite Template"),
                                               KStandardGuiItem::overwrite(),
                                               KStandardGuiItem::cancel(),
                                               u"overwrite_imported_template_warning"_s);
        if (ret != KMessageBox::Continue) {
            return;
        }

        QDir(destPath).removeRecursively();
    }

    QDir().mkpath(destPath);
    const QString errorStr = copyFolder(srcDir, destPath, ReplaceMap(), ReplaceMap(), QStringList());

    if (errorStr.isEmpty()) {
        const QModelIndex idx = addUserTemplateEntry(QFileInfo(destPath));
        if (idx != ui->u_templateTree->currentIndex()) {
            ui->u_templateTree->expand(idx);
            ui->u_templateTree->setCurrentIndex(idx);
        } else {
            templateIndexChanged(idx); // Force update even if index does not change
        }
    } else {
        KMessageBox::error(this, i18n("Failed to import template."));
    }
}

void Template::removeTemplate()
{
    QModelIndex currentIndex = ui->u_templateTree->currentIndex();
    if (!currentIndex.isValid())
        return;

    QString path = currentIndex.data(TreeData::PathRole).toString();
    if (path.isEmpty())
        return;

    QFileInfo info(path);
    if (!path.startsWith(userTemplatePath())) {
        KMessageBox::error(this, i18n("You do not have permission to delete this template."));
        return;
    }

    auto result = KMessageBox::questionTwoActions(this,
                                                  i18n("Are you sure you want to delete '%1'?", info.fileName()),
                                                  i18n("Delete Template"),
                                                  KStandardGuiItem::del(),
                                                  KStandardGuiItem::cancel());

    if (result != KMessageBox::PrimaryAction) {
        return;
    }

    QDir currDir = QDir(path);
    bool success = currDir.removeRecursively();
    QModelIndex parent = currentIndex.parent();
    m_selectionModel.removeAt(currentIndex);
    currentIndex = parent;
    parent = currentIndex.parent();
    currDir.cdUp();

    if (success) {
        QString root = userTemplatePath();

        while (currDir.absolutePath().startsWith(root)) {
            const auto entries = currDir.entryList(QDir::AllEntries | QDir::NoDotAndDotDot);
            if (!entries.isEmpty()) {
                break;
            }
            if (currDir.removeRecursively()) {
                m_selectionModel.removeAt(currentIndex);
            }
            currentIndex = parent;
            parent = currentIndex.parent();
            if (!currDir.cdUp()) {
                qWarning() << "Failed to move one directory up";
                break;
            }
        }

        const int rows = m_selectionModel.rowCount(currentIndex);
        const QModelIndex selectIndex = m_selectionModel.index(rows - 1, 0, currentIndex);
        ui->u_templateTree->expand(selectIndex);
        ui->u_templateTree->setCurrentIndex(selectIndex);
        // Force update in case the index does not change
        // This also updates the remove button state and the template config
        templateIndexChanged(selectIndex);
    } else {
        KMessageBox::error(this, i18n("Failed to delete the template."));
    }
}

#include "moc_template.cpp"
