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#include "systemsettings.h"
#include "coreconstants.h"
#include "editormanager/editormanager_p.h"
#include "icore.h"
#include "patchtool.h"
#include "vcsmanager.h"

#include <utils/checkablemessagebox.h>
#include <utils/consoleprocess.h>
#include <utils/environment.h>
#include <utils/hostosinfo.h>
#include <utils/unixutils.h>

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

#include "ui_systemsettings.h"

using namespace Utils;

namespace Core {
namespace Internal {

SystemSettings::SystemSettings()
    : m_page(0), m_dialog(0)
{
    setId(Constants::SETTINGS_ID_SYSTEM);
    setDisplayName(tr("System"));
    setCategory(Constants::SETTINGS_CATEGORY_CORE);
    setDisplayCategory(QCoreApplication::translate("Core", Constants::SETTINGS_TR_CATEGORY_CORE));
    setCategoryIcon(QLatin1String(Constants::SETTINGS_CATEGORY_CORE_ICON));
}

QWidget *SystemSettings::widget()
{
    if (!m_widget) {
        m_page = new Ui::SystemSettings();
        m_widget = new QWidget;
        m_page->setupUi(m_widget);

        m_page->reloadBehavior->setCurrentIndex(EditorManager::reloadSetting());
        if (HostOsInfo::isAnyUnixHost()) {
            const QStringList availableTerminals = ConsoleProcess::availableTerminalEmulators();
            const QString currentTerminal = ConsoleProcess::terminalEmulator(ICore::settings(), false);
            m_page->terminalComboBox->addItems(availableTerminals);
            m_page->terminalComboBox->lineEdit()->setText(currentTerminal);
            m_page->terminalComboBox->lineEdit()->setPlaceholderText(ConsoleProcess::defaultTerminalEmulator());
        } else {
            m_page->terminalLabel->hide();
            m_page->terminalComboBox->hide();
            m_page->resetTerminalButton->hide();
        }

        if (HostOsInfo::isAnyUnixHost() && !HostOsInfo::isMacHost()) {
            m_page->externalFileBrowserEdit->setText(UnixUtils::fileBrowser(ICore::settings()));
        } else {
            m_page->externalFileBrowserLabel->hide();
            m_page->externalFileBrowserEdit->hide();
            m_page->resetFileBrowserButton->hide();
            m_page->helpExternalFileBrowserButton->hide();
        }

        const QString patchToolTip = tr("Command used for reverting diff chunks.");
        m_page->patchCommandLabel->setToolTip(patchToolTip);
        m_page->patchChooser->setToolTip(patchToolTip);
        m_page->patchChooser->setExpectedKind(PathChooser::ExistingCommand);
        m_page->patchChooser->setHistoryCompleter(QLatin1String("General.PatchCommand.History"));
        m_page->patchChooser->setPath(PatchTool::patchCommand());
        m_page->autoSaveCheckBox->setChecked(EditorManagerPrivate::autoSaveEnabled());
        m_page->autoSaveInterval->setValue(EditorManagerPrivate::autoSaveInterval());
        m_page->warnBeforeOpeningBigFiles->setChecked(
                    EditorManagerPrivate::warnBeforeOpeningBigFilesEnabled());
        m_page->bigFilesLimitSpinBox->setValue(EditorManagerPrivate::bigFileSizeLimit());

        if (HostOsInfo::isAnyUnixHost()) {
            connect(m_page->resetTerminalButton, SIGNAL(clicked()), this, SLOT(resetTerminal()));
            if (!HostOsInfo::isMacHost()) {
                connect(m_page->resetFileBrowserButton, SIGNAL(clicked()), this, SLOT(resetFileBrowser()));
                connect(m_page->helpExternalFileBrowserButton, SIGNAL(clicked()),
                        this, SLOT(showHelpForFileBrowser()));
            }
        }

        updatePath();

        connect(VcsManager::instance(), SIGNAL(configurationChanged(const IVersionControl*)),
                this, SLOT(updatePath()));
    }
    return m_widget;
}

void SystemSettings::apply()
{
    if (!m_page) // wasn't shown, can't be changed
        return;
    EditorManager::setReloadSetting(IDocument::ReloadSetting(m_page->reloadBehavior->currentIndex()));
    if (HostOsInfo::isAnyUnixHost()) {
        ConsoleProcess::setTerminalEmulator(ICore::settings(),
                                            m_page->terminalComboBox->lineEdit()->text());
        if (!HostOsInfo::isMacHost()) {
            UnixUtils::setFileBrowser(ICore::settings(),
                                      m_page->externalFileBrowserEdit->text());
        }
    }
    PatchTool::setPatchCommand(m_page->patchChooser->path());
    EditorManagerPrivate::setAutoSaveEnabled(m_page->autoSaveCheckBox->isChecked());
    EditorManagerPrivate::setAutoSaveInterval(m_page->autoSaveInterval->value());
    EditorManagerPrivate::setWarnBeforeOpeningBigFilesEnabled(
                m_page->warnBeforeOpeningBigFiles->isChecked());
    EditorManagerPrivate::setBigFileSizeLimit(m_page->bigFilesLimitSpinBox->value());
}

void SystemSettings::finish()
{
    delete m_widget;
    delete m_page;
    m_page = 0;
}

void SystemSettings::resetTerminal()
{
    if (HostOsInfo::isAnyUnixHost())
        m_page->terminalComboBox->lineEdit()->clear();
}

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

void SystemSettings::updatePath()
{
    Environment env = Environment::systemEnvironment();
    QStringList toAdd = VcsManager::additionalToolsPath();
    env.appendOrSetPath(toAdd.join(HostOsInfo::pathListSeparator()));
    m_page->patchChooser->setEnvironment(env);
}

void SystemSettings::variableHelpDialogCreator(const QString &helpText)
{
    if (m_dialog) {
        if (m_dialog->text() != helpText)
            m_dialog->setText(helpText);

        m_dialog->show();
        ICore::raiseWindow(m_dialog);
        return;
    }
    QMessageBox *mb = new QMessageBox(QMessageBox::Information,
                                  tr("Variables"),
                                  helpText,
                                  QMessageBox::Close,
                                  m_widget);
    mb->setWindowModality(Qt::NonModal);
    m_dialog = mb;
    mb->show();
}


void SystemSettings::showHelpForFileBrowser()
{
    if (HostOsInfo::isAnyUnixHost() && !HostOsInfo::isMacHost())
        variableHelpDialogCreator(UnixUtils::fileBrowserHelpText());
}

} // namespace Internal
} // namespace Core