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/*
 * Copyright (c) 2010-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swift/QtUI/QtLoginWindow.h>

#include <algorithm>
#include <cassert>

#include <boost/bind.hpp>
#include <memory>

#include <QApplication>
#include <QBoxLayout>
#include <QCloseEvent>
#include <QComboBox>
#include <QCursor>
#include <QDebug>
#include <QDesktopWidget>
#include <QFileDialog>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QLabel>
#include <QMenuBar>
#include <QMessageBox>
#include <QStatusBar>
#include <QToolButton>

#include <Swiften/Base/Platform.h>
#include <Swiften/Base/Paths.h>

#include <Swift/Controllers/SettingConstants.h>
#include <Swift/Controllers/Settings/SettingsProvider.h>
#include <Swift/Controllers/UIEvents/RequestFileTransferListUIEvent.h>
#include <Swift/Controllers/UIEvents/RequestHighlightEditorUIEvent.h>
#include <Swift/Controllers/UIEvents/RequestXMLConsoleUIEvent.h>
#include <Swift/Controllers/UIEvents/UIEventStream.h>

#include <Swift/QtUI/QtAboutWidget.h>
#include <Swift/QtUI/QtConnectionSettingsWindow.h>
#include <Swift/QtUI/QtMainWindow.h>
#include <Swift/QtUI/QtSwiftUtil.h>
#include <Swift/QtUI/QtUISettingConstants.h>
#include <Swift/QtUI/QtUtilities.h>

#ifdef HAVE_SCHANNEL
#include "CAPICertificateSelector.h"
#include <Swiften/TLS/CAPICertificate.h>
#endif
#include <Swiften/TLS/PKCS12Certificate.h>

namespace Swift{

QtLoginWindow::QtLoginWindow(UIEventStream* uiEventStream, SettingsProvider* settings, TimerFactory* timerFactory) : QMainWindow(), settings_(settings), timerFactory_(timerFactory) {
    uiEventStream_ = uiEventStream;

    setWindowTitle("Swift");
#ifndef Q_OS_MAC
#ifdef  Q_OS_WIN32
    setWindowIcon(QIcon(":/logo-icon-16-win.png"));
#else
    setWindowIcon(QIcon(":/logo-icon-16.png"));
#endif
#endif
    QtUtilities::setX11Resource(this, "Main");
    setAccessibleName(tr("Swift Login Window"));
    //setAccessibleDescription(tr("This window is used for providing credentials to log into your XMPP service"));

    resize(200, 500);
    setContentsMargins(0,0,0,0);
    QWidget *centralWidget = new QWidget(this);
    setCentralWidget(centralWidget);
    QBoxLayout *topLayout = new QBoxLayout(QBoxLayout::TopToBottom, centralWidget);
    stack_ = new QStackedWidget(centralWidget);
    topLayout->addWidget(stack_);
    topLayout->setMargin(0);
    loginWidgetWrapper_ = new QWidget(this);
    loginWidgetWrapper_->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding));
    QBoxLayout *layout = new QBoxLayout(QBoxLayout::TopToBottom, loginWidgetWrapper_);
    layout->addStretch(2);

    QLabel* logo = new QLabel(this);
    QIcon swiftWithTextLogo = QIcon(":/logo-shaded-text.png");
    logo->setPixmap(swiftWithTextLogo.pixmap(QSize(192,192)));

    QWidget *logoWidget = new QWidget(this);
    QHBoxLayout *logoLayout = new QHBoxLayout();
    logoLayout->setMargin(0);
    logoLayout->addStretch(0);
    logoLayout->addWidget(logo);
    logoLayout->addStretch(0);
    logoWidget->setLayout(logoLayout);
    layout->addWidget(logoWidget);

    layout->addStretch(2);

    QLabel* jidLabel = new QLabel(this);
    jidLabel->setText("<font size='-1'>" + tr("User address:") + "</font>");
    layout->addWidget(jidLabel);


    username_ = new QComboBox(this);
    username_->setEditable(true);
    username_->setWhatsThis(tr("User address - looks like someuser@someserver.com"));
    username_->setToolTip(tr("User address - looks like someuser@someserver.com"));
    username_->view()->installEventFilter(this);
    username_->setAccessibleName(tr("User address (of the form someuser@someserver.com)"));
    username_->setAccessibleDescription(tr("This is the user address that you'll be using to log in with"));
    layout->addWidget(username_);
    QLabel* jidHintLabel = new QLabel(this);
    jidHintLabel->setText("<font size='-1' color='grey' >" + tr("Example: alice@wonderland.lit") + "</font>");
    jidHintLabel->setAlignment(Qt::AlignRight);
    layout->addWidget(jidHintLabel);


    QLabel* passwordLabel = new QLabel();
    passwordLabel->setText("<font size='-1'>" + tr("Password:") + "</font>");
    passwordLabel->setAccessibleName(tr("User password"));
    passwordLabel->setAccessibleDescription(tr("This is the password you'll use to log in to the XMPP service"));
    layout->addWidget(passwordLabel);


    QWidget* w = new QWidget(this);
    w->setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding));
    layout->addWidget(w);

    QHBoxLayout* credentialsLayout = new QHBoxLayout(w);
    credentialsLayout->setMargin(0);
    credentialsLayout->setSpacing(3);
    password_ = new QLineEdit(this);
    password_->setEchoMode(QLineEdit::Password);
    connect(password_, SIGNAL(returnPressed()), this, SLOT(loginClicked()));
    connect(username_->lineEdit(), SIGNAL(returnPressed()), password_, SLOT(setFocus()));
    connect(username_, SIGNAL(editTextChanged(const QString&)), this, SLOT(handleUsernameTextChanged()));
    credentialsLayout->addWidget(password_);

    certificateButton_ = new QToolButton(this);
    certificateButton_->setCheckable(true);
    certificateButton_->setIcon(QIcon(":/icons/certificate.png"));
    certificateButton_->setToolTip(tr("Click if you have a personal certificate used for login to the service."));
    certificateButton_->setWhatsThis(tr("Click if you have a personal certificate used for login to the service."));
    certificateButton_->setAccessibleName(tr("Login with certificate"));
    certificateButton_->setAccessibleDescription(tr("Click if you have a personal certificate used for login to the service."));

    credentialsLayout->addWidget(certificateButton_);
    connect(certificateButton_, SIGNAL(clicked(bool)), SLOT(handleCertficateChecked(bool)));

    loginButton_ = new QPushButton(this);
    loginButton_->setText(tr("Connect"));
    loginButton_->setAutoDefault(true);
    loginButton_->setDefault(true);
    loginButton_->setAccessibleName(tr("Connect now"));
    layout->addWidget(loginButton_);

    QLabel* connectionOptionsLabel = new QLabel(this);
    connectionOptionsLabel->setText("<a href=\"#\"><font size='-1'>" + QObject::tr("Connection Options") + "</font></a>");
    connectionOptionsLabel->setTextFormat(Qt::RichText);
    connectionOptionsLabel->setAlignment(Qt::AlignRight|Qt::AlignVCenter);
    layout->addWidget(connectionOptionsLabel);
    connect(connectionOptionsLabel, SIGNAL(linkActivated(const QString&)), SLOT(handleOpenConnectionOptions()));

    message_ = new QLabel(this);
    message_->setTextFormat(Qt::RichText);
    message_->setWordWrap(true);
    layout->addWidget(message_);

    layout->addStretch(2);
    remember_ = new QCheckBox(tr("Remember Password?"), this);
    layout->addWidget(remember_);
    loginAutomatically_ = new QCheckBox(tr("Login Automatically?"), this);
    layout->addWidget(loginAutomatically_);

    connect(loginButton_, SIGNAL(clicked()), SLOT(loginClicked()));
    stack_->addWidget(loginWidgetWrapper_);
#ifdef SWIFTEN_PLATFORM_MACOSX
    menuBar_ = new QMenuBar(nullptr);
#else
    menuBar_ = menuBar();
#endif
    QApplication::setQuitOnLastWindowClosed(false);

    swiftMenu_ = new QMenu(tr("&Swift"), this);
#ifdef SWIFTEN_PLATFORM_MACOSX
    generalMenu_ = new QMenu(tr("&General"), this);
#else
    generalMenu_ = swiftMenu_;
#endif

#ifdef SWIFTEN_PLATFORM_MACOSX
    QAction* aboutAction = new QAction(QString("&About %1").arg("Swift"), this);
#else
    QAction* aboutAction = new QAction(QString(tr("&About %1")).arg("Swift"), this);
#endif
    connect(aboutAction, SIGNAL(triggered()), SLOT(handleAbout()));
    swiftMenu_->addAction(aboutAction);

    xmlConsoleAction_ = new QAction(tr("&Show Debug Console"), this);
    connect(xmlConsoleAction_, SIGNAL(triggered()), SLOT(handleShowXMLConsole()));
    generalMenu_->addAction(xmlConsoleAction_);

#ifdef SWIFT_EXPERIMENTAL_FT
    fileTransferOverviewAction_ = new QAction(tr("Show &File Transfer Overview"), this);
    connect(fileTransferOverviewAction_, SIGNAL(triggered()), SLOT(handleShowFileTransferOverview()));
    generalMenu_->addAction(fileTransferOverviewAction_);
#endif

    highlightEditorAction_ = new QAction(tr("&Edit Highlight Rules"), this);
    connect(highlightEditorAction_, SIGNAL(triggered()), SLOT(handleShowHighlightEditor()));
    generalMenu_->addAction(highlightEditorAction_);

    toggleSoundsAction_ = new QAction(tr("&Play Sounds"), this);
    toggleSoundsAction_->setCheckable(true);
    toggleSoundsAction_->setChecked(settings_->getSetting(SettingConstants::PLAY_SOUNDS));
    connect(toggleSoundsAction_, SIGNAL(toggled(bool)), SLOT(handleToggleSounds(bool)));
    generalMenu_->addAction(toggleSoundsAction_);

    toggleNotificationsAction_ = new QAction(tr("Display Pop-up &Notifications"), this);
    toggleNotificationsAction_->setCheckable(true);
    toggleNotificationsAction_->setChecked(settings_->getSetting(SettingConstants::SHOW_NOTIFICATIONS));
    connect(toggleNotificationsAction_, SIGNAL(toggled(bool)), SLOT(handleToggleNotifications(bool)));

#ifndef SWIFTEN_PLATFORM_MACOSX
    swiftMenu_->addSeparator();
#endif

#ifdef SWIFTEN_PLATFORM_MACOSX
    QAction* quitAction = new QAction("&Quit", this);
#else
    QAction* quitAction = new QAction(tr("&Quit"), this);
#endif
    connect(quitAction, SIGNAL(triggered()), SLOT(handleQuit()));
    swiftMenu_->addAction(quitAction);

    setInitialMenus();
    settings_->onSettingChanged.connect(boost::bind(&QtLoginWindow::handleSettingChanged, this, _1));

    bool eagle = settings_->getSetting(SettingConstants::FORGET_PASSWORDS);
    remember_->setEnabled(!eagle);
    loginAutomatically_->setEnabled(!eagle);
    xmlConsoleAction_->setEnabled(!eagle);
    if (eagle) {
        remember_->setChecked(false);
        loginAutomatically_->setChecked(false);
    }

#ifdef SWIFTEN_PLATFORM_MACOSX
    // Temporary workaround for case 501. Could be that this code is still
    // needed when Qt provides a proper fix
    qApp->installEventFilter(this);
#endif


    this->show();
}

void QtLoginWindow::setShowNotificationToggle(bool toggle) {
    if (toggle) {
        QList< QAction* > generalMenuActions = generalMenu_->actions();
        generalMenu_->insertAction(generalMenuActions.at(generalMenuActions.count()-2), toggleNotificationsAction_);
    }
    else {
        generalMenu_->removeAction(toggleNotificationsAction_);
    }
}

bool QtLoginWindow::eventFilter(QObject *obj, QEvent *event) {
    if (obj == username_->view() && event->type() == QEvent::KeyPress) {
        QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
        if (keyEvent->key() == Qt::Key_Delete || keyEvent->key() == Qt::Key_Backspace) {
            QString jid(username_->view()->currentIndex().data().toString());
            int result = QMessageBox::question(this, tr("Remove profile"), tr("Remove the profile '%1'?").arg(jid), QMessageBox::Yes | QMessageBox::No);
            if (result == QMessageBox::Yes) {
                onPurgeSavedLoginRequest(Q2PSTRING(jid));
            }
            return true;
        }
    }
#ifdef SWIFTEN_PLATFORM_MACOSX
    // Dock clicked
    // Temporary workaround for case 501. Could be that this code is still
    // needed when Qt provides a proper fix
    if (obj == qApp && event->type() == QEvent::ApplicationActivate && !isVisible()) {
        bringToFront();
    }
#endif

    return QObject::eventFilter(obj, event);
}

void QtLoginWindow::handleSettingChanged(const std::string& settingPath) {
    if (settingPath == SettingConstants::PLAY_SOUNDS.getKey()) {
        toggleSoundsAction_->setChecked(settings_->getSetting(SettingConstants::PLAY_SOUNDS));
    }
    if (settingPath == SettingConstants::SHOW_NOTIFICATIONS.getKey()) {
        toggleNotificationsAction_->setChecked(settings_->getSetting(SettingConstants::SHOW_NOTIFICATIONS));
    }
}

void QtLoginWindow::selectUser(const std::string& username) {
    for (int i = 0; i < usernames_.count(); i++) {
        if (P2QSTRING(username) == usernames_[i]) {
            username_->setCurrentIndex(i);
            password_->setFocus();
            break;
        }
    }
}

void QtLoginWindow::removeAvailableAccount(const std::string& jid) {
    QString username = P2QSTRING(jid);
    int index = -1;
    for (int i = 0; i < usernames_.count(); i++) {
        if (username == usernames_[i]) {
            index = i;
        }
    }
    if (index >= 0) {
        usernames_.removeAt(index);
        passwords_.removeAt(index);
        certificateFiles_.removeAt(index);
        username_->removeItem(index);
    }
}

void QtLoginWindow::addAvailableAccount(const std::string& defaultJID, const std::string& defaultPassword, const std::string& defaultCertificate, const ClientOptions& options) {
    QString username = P2QSTRING(defaultJID);
    int index = -1;
    for (int i = 0; i < usernames_.count(); i++) {
        if (username == usernames_[i]) {
            index = i;
        }
    }
    if (index == -1) {
        usernames_.append(username);
        passwords_.append(P2QSTRING(defaultPassword));
        certificateFiles_.append(P2QSTRING(defaultCertificate));
        options_.push_back(options);
        username_->addItem(username);
    } else {
        usernames_[index] = username;
        passwords_[index] = P2QSTRING(defaultPassword);
        certificateFiles_[index] = P2QSTRING(defaultCertificate);
        options_[index] = options;
    }
}

void QtLoginWindow::handleUsernameTextChanged() {
    QString username = username_->currentText();
    for (int i = 0; i < usernames_.count(); i++) {
        if (username_->currentText() == usernames_[i]) {
            certificateFile_ = certificateFiles_[i];
            password_->setText(passwords_[i]);
            remember_->setChecked(password_->text() != "");
            currentOptions_ = options_[i];
        }
    }
    certificateButton_->setChecked(!certificateFile_.isEmpty());
}

void QtLoginWindow::loggedOut() {
    stack_->removeWidget(stack_->currentWidget());
    stack_->addWidget(loginWidgetWrapper_);
    stack_->setCurrentWidget(loginWidgetWrapper_);
    setInitialMenus();
    setIsLoggingIn(false);
}

void QtLoginWindow::setIsLoggingIn(bool loggingIn) {
    /* Change the for loop as well if you add to this.*/
    QWidget* widgets[5] = {username_, password_, remember_, loginAutomatically_, certificateButton_};
    loginButton_->setText(loggingIn ? tr("Cancel") : tr("Connect"));
    for (auto& widget : widgets) {
        widget->setEnabled(!loggingIn);
    }
    bool eagle = settings_->getSetting(SettingConstants::FORGET_PASSWORDS);
    remember_->setEnabled(!eagle);
    loginAutomatically_->setEnabled(!eagle);
}

void QtLoginWindow::loginClicked() {
    if (username_->isEnabled()) {
        std::string banner = settings_->getSetting(QtUISettingConstants::CLICKTHROUGH_BANNER);
        if (!banner.empty()) {
            QMessageBox msgBox;
            msgBox.setWindowTitle(tr("Confirm terms of use"));
            msgBox.setText("");
            msgBox.setInformativeText(P2QSTRING(banner));
            msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
            msgBox.setDefaultButton(QMessageBox::No);
            if (msgBox.exec() != QMessageBox::Yes) {
                return;
            }
        }
        CertificateWithKey::ref certificate;
        std::string certificateString = Q2PSTRING(certificateFile_);
        if (!certificateString.empty()) {
#if defined(HAVE_SCHANNEL)
            if (isCAPIURI(certificateString)) {
                certificate = std::make_shared<CAPICertificate>(certificateString, timerFactory_);
            } else {
                certificate = std::make_shared<PKCS12Certificate>(certificateString, createSafeByteArray(Q2PSTRING(password_->text())));
            }
#else
            certificate = std::make_shared<PKCS12Certificate>(certificateString, createSafeByteArray(Q2PSTRING(password_->text())));
#endif
        }

        onLoginRequest(Q2PSTRING(username_->currentText()), Q2PSTRING(password_->text()), certificateString, certificate, currentOptions_, remember_->isChecked(), loginAutomatically_->isChecked());
        if (settings_->getSetting(SettingConstants::FORGET_PASSWORDS)) { /* Mustn't remember logins */
            username_->clearEditText();
            password_->setText("");
        }
    } else {
        onCancelLoginRequest();
    }
}

void QtLoginWindow::setLoginAutomatically(bool loginAutomatically) {
    loginAutomatically_->setChecked(loginAutomatically);
}

void QtLoginWindow::handleCertficateChecked(bool checked) {
    if (checked) {
#ifdef HAVE_SCHANNEL
        certificateFile_ = P2QSTRING(selectCAPICertificate());
        if (certificateFile_.isEmpty()) {
            certificateButton_->setChecked(false);
        }
#else
        certificateFile_ = QFileDialog::getOpenFileName(this, tr("Select an authentication certificate"), QString(), tr("P12 files (*.cert *.p12 *.pfx);;All files (*.*)"));
        if (certificateFile_.isEmpty()) {
            certificateButton_->setChecked(false);
        }
#endif
    }
    else {
        certificateFile_ = "";
    }
}

void QtLoginWindow::handleAbout() {
    if (!aboutDialog_) {
        aboutDialog_ = new QtAboutWidget(settings_);
        aboutDialog_->show();
    }
    else {
        aboutDialog_->show();
        aboutDialog_->raise();
        aboutDialog_->activateWindow();
    }
}

void QtLoginWindow::handleShowXMLConsole() {
    uiEventStream_->send(std::make_shared<RequestXMLConsoleUIEvent>());
}

void QtLoginWindow::handleShowFileTransferOverview() {
    uiEventStream_->send(std::make_shared<RequestFileTransferListUIEvent>());
}

void QtLoginWindow::handleShowHighlightEditor() {
    uiEventStream_->send(std::make_shared<RequestHighlightEditorUIEvent>());
}

void QtLoginWindow::handleToggleSounds(bool enabled) {
    settings_->storeSetting(SettingConstants::PLAY_SOUNDS, enabled);
}

void QtLoginWindow::handleToggleNotifications(bool enabled) {
    settings_->storeSetting(SettingConstants::SHOW_NOTIFICATIONS, enabled);
}

void QtLoginWindow::handleQuit() {
    onQuitRequest();
}

void QtLoginWindow::quit() {
    QApplication::quit();
}

void QtLoginWindow::setInitialMenus() {
    menuBar_->clear();
    menuBar_->addMenu(swiftMenu_);
#ifdef SWIFTEN_PLATFORM_MACOSX
    menuBar_->addMenu(generalMenu_);
#endif
}

void QtLoginWindow::morphInto(MainWindow *mainWindow) {
    setEnabled(false);
    QtMainWindow *qtMainWindow = dynamic_cast<QtMainWindow*>(mainWindow);
    assert(qtMainWindow);
    stack_->removeWidget(loginWidgetWrapper_);
    stack_->addWidget(qtMainWindow);
    stack_->setCurrentWidget(qtMainWindow);
    setEnabled(true);
    setInitialMenus();
    std::vector<QMenu*> mainWindowMenus = qtMainWindow->getMenus();
    viewMenu_ = mainWindowMenus[0];
    for (auto menu : mainWindowMenus) {
        menuBar_->addMenu(menu);
    }
    setFocus();
}

void QtLoginWindow::setMessage(const std::string& message) {
    if (!message.empty()) {
        message_->setText("<center><font color=\"red\">" + P2QSTRING(message) + "</font></center>");
    }
    else {
        message_->setText("");
    }
}

void QtLoginWindow::toggleBringToFront() {
    if (!isVisible()) {
        bringToFront();
    }
    else {
        window()->hide();
    }
}

void QtLoginWindow::bringToFront() {
    window()->showNormal();
    window()->raise();
    window()->activateWindow();
}

void QtLoginWindow::hide() {
    window()->hide();
}

QtLoginWindow::QtMenus QtLoginWindow::getMenus() const {
    return QtMenus(swiftMenu_, generalMenu_);
}

void QtLoginWindow::resizeEvent(QResizeEvent*) {
    emit geometryChanged();
}

void QtLoginWindow::moveEvent(QMoveEvent*) {
    emit geometryChanged();
}

bool QtLoginWindow::askUserToTrustCertificatePermanently(const std::string& message, const std::vector<Certificate::ref>& certificates) {
    QMessageBox dialog(this);

    dialog.setText(tr("The certificate presented by the server is not valid."));
    dialog.setInformativeText(P2QSTRING(message) + "\n\n" + tr("Would you like to permanently trust this certificate? This must only be done if you know it is correct."));

    dialog.addButton(tr("Show Certificate"), QMessageBox::HelpRole);
    dialog.addButton(QMessageBox::Yes);
    dialog.addButton(QMessageBox::No);
    dialog.setDefaultButton(QMessageBox::No);
    while (true) {
        int result = dialog.exec();
        if (result == QMessageBox::Yes || result == QMessageBox::No) {
            return result == QMessageBox::Yes;
        }
        // FIXME: This isn't very nice, because the dialog disappears every time. We actually need a real
        // dialog with a custom button.
        QtMainWindow::openCertificateDialog(certificates, &dialog);
    }
}

void QtLoginWindow::handleOpenConnectionOptions() {
    QtConnectionSettingsWindow connectionSettings(currentOptions_);
    if (connectionSettings.exec() == QDialog::Accepted) {
        currentOptions_ = connectionSettings.getOptions();
    }
}

}