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**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include "systemsettings.h"
#include "coreconstants.h"
#include "coreplugin.h"
#include "editormanager/editormanager_p.h"
#include "dialogs/restartdialog.h"
#include "fileutils.h"
#include "icore.h"
#include "iversioncontrol.h"
#include "mainwindow.h"
#include "patchtool.h"
#include "vcsmanager.h"

#include <app/app_version.h>

#include <utils/algorithm.h>
#include <utils/checkablemessagebox.h>
#include <utils/environment.h>
#include <utils/environmentdialog.h>
#include <utils/hostosinfo.h>
#include <utils/terminalcommand.h>
#include <utils/unixutils.h>

#include <QCoreApplication>
#include <QMessageBox>
#include <QSettings>

#include "ui_systemsettings.h"

using namespace Utils;

namespace Core {
namespace Internal {

#ifdef ENABLE_CRASHPAD
const char crashReportingEnabledKey[] = "CrashReportingEnabled";
const char showCrashButtonKey[] = "ShowCrashButton";

// TODO: move to somewhere in Utils
static QString formatSize(qint64 size)
{
    QStringList units {QObject::tr("Bytes"), QObject::tr("KB"), QObject::tr("MB"),
                       QObject::tr("GB"), QObject::tr("TB")};
    double outputSize = size;
    int i;
    for (i = 0; i < units.size() - 1; ++i) {
        if (outputSize < 1024)
            break;
        outputSize /= 1024;
    }
    return i == 0 ? QString("%0 %1").arg(outputSize).arg(units[i]) // Bytes
                  : QString("%0 %1").arg(outputSize, 0, 'f', 2).arg(units[i]); // KB, MB, GB, TB
}
#endif // ENABLE_CRASHPAD

class SystemSettingsWidget : public IOptionsPageWidget
{
    Q_DECLARE_TR_FUNCTIONS(Core::Internal::SystemSettingsWidget)

public:
    SystemSettingsWidget()
    {
        m_ui.setupUi(this);
        m_ui.terminalOpenArgs->setToolTip(
            tr("Command line arguments used for \"%1\".").arg(FileUtils::msgTerminalHereAction()));

        m_ui.reloadBehavior->setCurrentIndex(EditorManager::reloadSetting());
        if (HostOsInfo::isAnyUnixHost()) {
            const QVector<TerminalCommand> availableTerminals = TerminalCommand::availableTerminalEmulators();
            for (const TerminalCommand &term : availableTerminals)
                m_ui.terminalComboBox->addItem(term.command, QVariant::fromValue(term));
            updateTerminalUi(TerminalCommand::terminalEmulator());
            connect(m_ui.terminalComboBox, &QComboBox::currentIndexChanged, this,
                    [this](int index) {
                updateTerminalUi(m_ui.terminalComboBox->itemData(index).value<TerminalCommand>());
            });
        } else {
            m_ui.terminalLabel->hide();
            m_ui.terminalComboBox->hide();
            m_ui.terminalOpenArgs->hide();
            m_ui.terminalExecuteArgs->hide();
            m_ui.resetTerminalButton->hide();
        }

        if (HostOsInfo::isAnyUnixHost() && !HostOsInfo::isMacHost()) {
            m_ui.externalFileBrowserEdit->setText(UnixUtils::fileBrowser(ICore::settings()));
        } else {
            m_ui.externalFileBrowserLabel->hide();
            m_ui.externalFileBrowserWidget->hide();
        }

        const QString patchToolTip = tr("Command used for reverting diff chunks.");
        m_ui.patchCommandLabel->setToolTip(patchToolTip);
        m_ui.patchChooser->setToolTip(patchToolTip);
        m_ui.patchChooser->setExpectedKind(PathChooser::ExistingCommand);
        m_ui.patchChooser->setHistoryCompleter(QLatin1String("General.PatchCommand.History"));
        m_ui.patchChooser->setFilePath(PatchTool::patchCommand());
        m_ui.autoSaveCheckBox->setChecked(EditorManagerPrivate::autoSaveEnabled());
        m_ui.autoSaveCheckBox->setToolTip(tr("Automatically creates temporary copies of "
                                                "modified files. If %1 is restarted after "
                                                "a crash or power failure, it asks whether to "
                                                "recover the auto-saved content.")
                                             .arg(Constants::IDE_DISPLAY_NAME));
        m_ui.autoSaveRefactoringCheckBox->setChecked(EditorManager::autoSaveAfterRefactoring());
        m_ui.autoSaveRefactoringCheckBox->setToolTip(tr("Automatically saves all open files "
            "affected by a refactoring operation,\n provided they were unmodified before the "
            "refactoring."));
        m_ui.autoSaveInterval->setValue(EditorManagerPrivate::autoSaveInterval());
        m_ui.autoSuspendCheckBox->setChecked(EditorManagerPrivate::autoSuspendEnabled());
        m_ui.autoSuspendMinDocumentCount->setValue(EditorManagerPrivate::autoSuspendMinDocumentCount());
        m_ui.warnBeforeOpeningBigFiles->setChecked(
                    EditorManagerPrivate::warnBeforeOpeningBigFilesEnabled());
        m_ui.bigFilesLimitSpinBox->setValue(EditorManagerPrivate::bigFileSizeLimit());
        m_ui.maxRecentFilesSpinBox->setMinimum(1);
        m_ui.maxRecentFilesSpinBox->setMaximum(99);
        m_ui.maxRecentFilesSpinBox->setValue(EditorManagerPrivate::maxRecentFiles());
#ifdef ENABLE_CRASHPAD
        if (ICore::settings()->value(showCrashButtonKey).toBool()) {
            auto crashButton = new QPushButton("CRASH!!!");
            crashButton->show();
            connect(crashButton, &QPushButton::clicked, []() {
                // do a real crash
                volatile int* a = reinterpret_cast<volatile int *>(NULL); *a = 1;
            });
        }

        m_ui.enableCrashReportingCheckBox->setChecked(
                    ICore::settings()->value(crashReportingEnabledKey).toBool());
        connect(m_ui.helpCrashReportingButton, &QAbstractButton::clicked, this, [this] {
            showHelpDialog(tr("Crash Reporting"), CorePlugin::msgCrashpadInformation());
        });
        connect(m_ui.enableCrashReportingCheckBox, &QCheckBox::stateChanged, this, [this] {
            const QString restartText = tr("The change will take effect after restart.");
            Core::RestartDialog restartDialog(Core::ICore::dialogParent(), restartText);
            restartDialog.exec();
            if (restartDialog.result() == QDialog::Accepted)
                apply();
        });

        updateClearCrashWidgets();
        connect(m_ui.clearCrashReportsButton, &QPushButton::clicked, this, [&] {
            QDir crashReportsDir = ICore::crashReportsPath().toDir();
            crashReportsDir.setFilter(QDir::Files);
            const QStringList crashFiles = crashReportsDir.entryList();
            for (QString file : crashFiles)
                crashReportsDir.remove(file);
            updateClearCrashWidgets();
        });
#else
        m_ui.enableCrashReportingCheckBox->setVisible(false);
        m_ui.helpCrashReportingButton->setVisible(false);
        m_ui.clearCrashReportsButton->setVisible(false);
        m_ui.crashReportsSizeText->setVisible(false);
#endif

        m_ui.askBeforeExitCheckBox->setChecked(
                    static_cast<Core::Internal::MainWindow *>(ICore::mainWindow())->askConfirmationBeforeExit());

        if (HostOsInfo::isAnyUnixHost()) {
            connect(m_ui.resetTerminalButton, &QAbstractButton::clicked,
                    this, &SystemSettingsWidget::resetTerminal);
            if (!HostOsInfo::isMacHost()) {
                connect(m_ui.resetFileBrowserButton, &QAbstractButton::clicked,
                        this, &SystemSettingsWidget::resetFileBrowser);
                connect(m_ui.helpExternalFileBrowserButton, &QAbstractButton::clicked,
                        this, &SystemSettingsWidget::showHelpForFileBrowser);
            }
        }

        if (HostOsInfo::isMacHost()) {
            Qt::CaseSensitivity defaultSensitivity
                    = OsSpecificAspects::fileNameCaseSensitivity(HostOsInfo::hostOs());
            if (defaultSensitivity == Qt::CaseSensitive) {
                m_ui.fileSystemCaseSensitivityChooser->addItem(tr("Case Sensitive (Default)"),
                                                                  Qt::CaseSensitive);
            } else {
                m_ui.fileSystemCaseSensitivityChooser->addItem(tr("Case Sensitive"),
                                                                  Qt::CaseSensitive);
            }
            if (defaultSensitivity == Qt::CaseInsensitive) {
                m_ui.fileSystemCaseSensitivityChooser->addItem(tr("Case Insensitive (Default)"),
                                                                  Qt::CaseInsensitive);
            } else {
                m_ui.fileSystemCaseSensitivityChooser->addItem(tr("Case Insensitive"),
                                                                  Qt::CaseInsensitive);
            }
            const Qt::CaseSensitivity sensitivity = EditorManagerPrivate::readFileSystemSensitivity(
                ICore::settings());
            if (sensitivity == Qt::CaseSensitive)
                m_ui.fileSystemCaseSensitivityChooser->setCurrentIndex(0);
            else
                m_ui.fileSystemCaseSensitivityChooser->setCurrentIndex(1);
        } else {
            m_ui.fileSystemCaseSensitivityLabel->hide();
            m_ui.fileSystemCaseSensitivityWidget->hide();
        }

        updatePath();

        m_ui.environmentChangesLabel->setElideMode(Qt::ElideRight);
        m_environmentChanges = CorePlugin::environmentChanges();
        updateEnvironmentChangesLabel();
        connect(m_ui.environmentButton, &QPushButton::clicked, [this] {
            Utils::optional<EnvironmentItems> changes
                = Utils::EnvironmentDialog::getEnvironmentItems(m_ui.environmentButton,
                                                                m_environmentChanges);
            if (!changes)
                return;
            m_environmentChanges = *changes;
            updateEnvironmentChangesLabel();
            updatePath();
        });

        connect(VcsManager::instance(), &VcsManager::configurationChanged,
                this, &SystemSettingsWidget::updatePath);
    }

private:
    void apply() final;

    void showHelpForFileBrowser();
    void resetFileBrowser();
    void resetTerminal();
    void updateTerminalUi(const Utils::TerminalCommand &term);
    void updatePath();
    void updateEnvironmentChangesLabel();
    void updateClearCrashWidgets();

    void showHelpDialog(const QString &title, const QString &helpText);
    Ui::SystemSettings m_ui;
    QPointer<QMessageBox> m_dialog;
    EnvironmentItems m_environmentChanges;
};

void SystemSettingsWidget::apply()
{
    QtcSettings *settings = ICore::settings();
    EditorManager::setReloadSetting(IDocument::ReloadSetting(m_ui.reloadBehavior->currentIndex()));
    if (HostOsInfo::isAnyUnixHost()) {
        TerminalCommand::setTerminalEmulator({m_ui.terminalComboBox->lineEdit()->text(),
                                             m_ui.terminalOpenArgs->text(),
                                             m_ui.terminalExecuteArgs->text()});
        if (!HostOsInfo::isMacHost()) {
            UnixUtils::setFileBrowser(settings, m_ui.externalFileBrowserEdit->text());
        }
    }
    PatchTool::setPatchCommand(m_ui.patchChooser->filePath());
    EditorManagerPrivate::setAutoSaveEnabled(m_ui.autoSaveCheckBox->isChecked());
    EditorManagerPrivate::setAutoSaveInterval(m_ui.autoSaveInterval->value());
    EditorManagerPrivate::setAutoSaveAfterRefactoring(
                m_ui.autoSaveRefactoringCheckBox->isChecked());
    EditorManagerPrivate::setAutoSuspendEnabled(m_ui.autoSuspendCheckBox->isChecked());
    EditorManagerPrivate::setAutoSuspendMinDocumentCount(m_ui.autoSuspendMinDocumentCount->value());
    EditorManagerPrivate::setWarnBeforeOpeningBigFilesEnabled(
                m_ui.warnBeforeOpeningBigFiles->isChecked());
    EditorManagerPrivate::setBigFileSizeLimit(m_ui.bigFilesLimitSpinBox->value());
    EditorManagerPrivate::setMaxRecentFiles(m_ui.maxRecentFilesSpinBox->value());
#ifdef ENABLE_CRASHPAD
    ICore::settings()->setValue(crashReportingEnabledKey,
                                m_ui.enableCrashReportingCheckBox->isChecked());
#endif

    static_cast<Core::Internal::MainWindow *>(ICore::mainWindow())->setAskConfirmationBeforeExit(
                m_ui.askBeforeExitCheckBox->isChecked());

    if (HostOsInfo::isMacHost()) {
        const Qt::CaseSensitivity sensitivity = EditorManagerPrivate::readFileSystemSensitivity(
            settings);
        const Qt::CaseSensitivity selectedSensitivity = Qt::CaseSensitivity(
            m_ui.fileSystemCaseSensitivityChooser->currentData().toInt());
        if (selectedSensitivity != sensitivity) {
            EditorManagerPrivate::writeFileSystemSensitivity(settings, selectedSensitivity);
            RestartDialog dialog(
                ICore::dialogParent(),
                tr("The file system case sensitivity change will take effect after restart."));
            dialog.exec();
        }
    }

    CorePlugin::setEnvironmentChanges(m_environmentChanges);
}

void SystemSettingsWidget::resetTerminal()
{
    if (HostOsInfo::isAnyUnixHost())
        m_ui.terminalComboBox->setCurrentIndex(0);
}

void SystemSettingsWidget::updateTerminalUi(const TerminalCommand &term)
{
    m_ui.terminalComboBox->lineEdit()->setText(term.command);
    m_ui.terminalOpenArgs->setText(term.openArgs);
    m_ui.terminalExecuteArgs->setText(term.executeArgs);
}

void SystemSettingsWidget::resetFileBrowser()
{
    if (HostOsInfo::isAnyUnixHost() && !HostOsInfo::isMacHost())
        m_ui.externalFileBrowserEdit->setText(UnixUtils::defaultFileBrowser());
}

void SystemSettingsWidget::updatePath()
{
    EnvironmentChange change;
    change.addAppendToPath(VcsManager::additionalToolsPath());
    m_ui.patchChooser->setEnvironmentChange(change);
}

void SystemSettingsWidget::updateEnvironmentChangesLabel()
{
    const QString shortSummary = Utils::EnvironmentItem::toStringList(m_environmentChanges)
                                     .join("; ");
    m_ui.environmentChangesLabel->setText(shortSummary.isEmpty() ? tr("No changes to apply.")
                                                                 : shortSummary);
}

void SystemSettingsWidget::showHelpDialog(const QString &title, const QString &helpText)
{
    if (m_dialog) {
        if (m_dialog->windowTitle() != title)
            m_dialog->setText(helpText);

        if (m_dialog->text() != helpText)
            m_dialog->setText(helpText);

        m_dialog->show();
        ICore::raiseWindow(m_dialog);
        return;
    }
    auto mb = new QMessageBox(QMessageBox::Information, title, helpText, QMessageBox::Close, this);
    mb->setWindowModality(Qt::NonModal);
    m_dialog = mb;
    mb->show();
}

#ifdef ENABLE_CRASHPAD
void SystemSettingsWidget::updateClearCrashWidgets()
{
    QDir crashReportsDir(ICore::crashReportsPath().toDir());
    crashReportsDir.setFilter(QDir::Files);
    qint64 size = 0;
    const QStringList crashFiles = crashReportsDir.entryList();
    for (QString file : crashFiles)
        size += QFileInfo(crashReportsDir, file).size();

    m_ui.clearCrashReportsButton->setEnabled(!crashFiles.isEmpty());
    m_ui.crashReportsSizeText->setText(formatSize(size));
}
#endif

void SystemSettingsWidget::showHelpForFileBrowser()
{
    if (HostOsInfo::isAnyUnixHost() && !HostOsInfo::isMacHost())
        showHelpDialog(tr("Variables"), UnixUtils::fileBrowserHelpText());
}

SystemSettings::SystemSettings()
{
    setId(Constants::SETTINGS_ID_SYSTEM);
    setDisplayName(SystemSettingsWidget::tr("System"));
    setCategory(Constants::SETTINGS_CATEGORY_CORE);
    setWidgetCreator([] { return new SystemSettingsWidget; });
}

} // namespace Internal
} // namespace Core