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/*******************************************************************************
 **
 ** smolbote: yet another qute browser
 ** Copyright (C) 2017  Xian Nox
 **
 ** This program is free software: you can redistribute it and/or modify
 ** it under the terms of the GNU General Public License as published by
 ** the Free Software Foundation, either version 3 of the License, or
 ** (at your option) any later version.
 **
 ** This program is distributed in the hope that it will be useful,
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ** GNU General Public License for more details.
 **
 ** You should have received a copy of the GNU General Public License
 ** along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **
 ******************************************************************************/

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "widgets/mainwindowmenubar.h"
#include <QMessageBox>
#include "forms/aboutdialog.h"

#include <QToolButton>
#include <QStyle>

#include <QFileDialog>

#include <QWebEngineHistory>

#include <QDockWidget>

#include <settings/configuration.h>

#include <bookmarks/bookmarkswidget.h>
#include <downloads/downloadswidget.h>

#include "browser.h"
#include <settings/settingsdialog.h>

MainWindow::MainWindow(std::shared_ptr<Configuration> config, QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow),
    navigationToolBar(new QToolBar(tr("Navigation"), this)),
    tabToolBar(new QToolBar(tr("Tab bar"), this)),
    tabBar(new WebViewTabBar(nullptr, this)),
    m_addressBar(new AddressBar(navigationToolBar)),
    m_progressBar(new LoadingBar(this))
{
    Q_ASSERT(config);
    m_config = config;

    // delete this window when it closes
    setAttribute(Qt::WA_DeleteOnClose, true);

    // set up UI
    ui->setupUi(this);
    QAction *fullscreenAction = new QAction(this);
    fullscreenAction->setShortcut(QKeySequence(QString::fromStdString(m_config->value<std::string>("browser.shortcuts.fullscreen").value())));
    connect(fullscreenAction, &QAction::triggered, this, &MainWindow::toggleFullscreen);
    addAction(fullscreenAction);

    // Dockable widget styling
    setDockOptions(dockOptions() | AllowTabbedDocks | ForceTabbedDocks);
    setTabPosition(Qt::LeftDockWidgetArea, QTabWidget::North);
    setTabPosition(Qt::RightDockWidgetArea, QTabWidget::North);

    // Main menu
    menuBar = new MainWindowMenuBar(config, this);
    menuBar->setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Preferred);

    connect(menuBar->printAction(), &QAction::triggered, this, [&]() {
        const QString path = QFileDialog::getSaveFileName(this, tr("Print to PDF"), QDir::homePath(), tr("PDF files (*.pdf)"));
        m_currentView->page()->printToPdf(path);
    });

    // Add the toolbars
    // tabToolBar: main menu and tab list
    tabToolBar->setMovable(m_config->value<bool>("browser.ui.tabtoolbarMovable").value());
    tabToolBar->addWidget(menuBar);
    //tabToolBar->addWidget(tabBar);
    this->addToolBar(Qt::TopToolBarArea, tabToolBar);
    this->addToolBarBreak(Qt::TopToolBarArea);

    // navigationToolBar: address bar
    navigationToolBar->setMovable(m_config->value<bool>("browser.ui.navtoolbarMovable").value());

    // page actions
    m_backButton = new NavigationButton(NavigationButton::BackButton, this);

    m_forwardButton = new NavigationButton(NavigationButton::ForwardButton, this);

    m_reloadButton = new NavigationButton(NavigationButton::ReloadButton, this);

    QToolButton *homepageButton = new QToolButton(this);
    homepageButton->setIcon(style()->standardIcon(QStyle::SP_DirHomeIcon));
    connect(homepageButton, &QToolButton::clicked, this, [&]() {
        tabBar->currentView()->load(tabBar->profile()->homepage());
    });

    navigationToolBar->addWidget(m_backButton);
    navigationToolBar->addWidget(m_forwardButton);
    navigationToolBar->addWidget(m_reloadButton);
    navigationToolBar->addWidget(homepageButton);
    navigationToolBar->addWidget(m_addressBar);
    this->addToolBar(Qt::TopToolBarArea, navigationToolBar);

    // connect signals
    connect(m_addressBar, &AddressBar::addressEntered, this, [&](const QUrl &url) {
        tabBar->currentView()->load(url);
    });
    connect(m_addressBar, &AddressBar::searchTermEntered, this, [&](const QString &string) {
        QString term = string.mid(1);
        term.replace(' ', '+');
        //tabBar->currentView()->load(QUrl::fromUserInput(browser->settings()->value("general.search").toString().replace("$term", term)));
    });
    connect(tabBar, SIGNAL(currentTabChanged(WebView*)), this, SLOT(handleTabChanged(WebView*)));

    // loading bar
    ui->statusBar->addPermanentWidget(m_progressBar);

    // shortcuts
    QAction *focusAddressAction = new QAction(this);
    //focusAddressAction->setShortcut(QKeySequence::fromString(browser->settings()->value("window.shortcuts.focusAddress").toString()));
    connect(focusAddressAction, SIGNAL(triggered(bool)), this, SLOT(focusAddress()));
    addAction(focusAddressAction);

    resize(m_config->value<int>("browser.window.width").value(), m_config->value<int>("browser.window.height").value());
    if(m_config->value<bool>("browser.window.maximized").value()) {
        showMaximized();
    }
}

MainWindow::~MainWindow()
{
    // Release all dock widgets before deleting so we don't accidentally delete them
    // Also fixes that annoying crash when closing
    QList<QDockWidget*> allDockWidgets = findChildren<QDockWidget*>();
    for(QDockWidget *w : allDockWidgets) {
        if(w->widget()) {
            w->widget()->setParent(nullptr);
        }
    }

    delete ui;
}

void MainWindow::addTabbedDock(Qt::DockWidgetArea area, QWidget *widget)
{
    // get all dock widgets
    QList<QDockWidget*> allDockWidgets = findChildren<QDockWidget*>();

    // make a list of widgets in the area we want
    QVector<QDockWidget*> areaDockWidgets;
    for(QDockWidget *w : allDockWidgets) {
        if(dockWidgetArea(w) == area) {
            areaDockWidgets.append(w);
        }
    }

    // create a dock widget
    QDockWidget *dock = new QDockWidget(widget->windowTitle(), this);

    // release the held widget when deleted
    connect(dock, &QDockWidget::destroyed, this, [dock]() {
        dock->widget()->setParent(nullptr);
    });
    dock->setWidget(widget);

    if(areaDockWidgets.empty()) {
        // no other widgets
        addDockWidget(area, dock);
    } else {
        // there are other widgets, so put it after the last one
        tabifyDockWidget(areaDockWidgets.last(), dock);
    }
}

void MainWindow::newTab(const QUrl &url)
{
    if(!m_tabBarAdded) {
        m_tabBarAdded = true;
        tabToolBar->addWidget(tabBar);
    }
    tabBar->addTab(url);
}

void MainWindow::newWindow(const QUrl &url)
{
    Browser *instance = static_cast<Browser*>(qApp->instance());
    MainWindow *window = instance->createWindow();
    window->setProfile(tabBar->profile());
    window->newTab(url);
}

void MainWindow::focusAddress()
{
    m_addressBar->setFocus();
}

void MainWindow::closeEvent(QCloseEvent *event)
{
    if(tabBar->count() > 1) {
        int ret = QMessageBox::warning(this, tr("Close window?"), tr("Close multiple tabs?"), QMessageBox::Yes | QMessageBox::No, QMessageBox::No);
        if(ret == QMessageBox::No) {
            event->ignore();
            return;
        }
    }
    QMainWindow::closeEvent(event);
}

void MainWindow::about()
{
    AboutDialog *dlg = new AboutDialog(this);
    dlg->exec();
}

void MainWindow::showSettingsDialog()
{
    SettingsDialog *dlg = new SettingsDialog(m_config, this);
    dlg->exec();
}

void MainWindow::setProfile(WebEngineProfile *profile)
{
    Q_ASSERT(profile != nullptr);
    tabBar->setProfile(profile);
}

void MainWindow::setBookmarksWidget(std::shared_ptr<BookmarksWidget> &widget)
{
    Q_ASSERT(widget);
    m_bookmarksWidget = widget;
    connect(menuBar->bookmarksAction(), &QAction::triggered, this, [this]() {
        addTabbedDock(Qt::RightDockWidgetArea, m_bookmarksWidget.get());
    });
    connect(m_bookmarksWidget.get(), &BookmarksWidget::openUrl, this, [this](const QUrl &url) {
        if(isActiveWindow()) {
            newTab(url);
        }
    });
}

void MainWindow::setDownloadsWidget(std::shared_ptr<DownloadsWidget> &widget)
{
    Q_ASSERT(widget);
    m_downloadsWidget = widget;
    connect(menuBar->downloadsAction(), &QAction::triggered, this, [this]() {
        addTabbedDock(Qt::RightDockWidgetArea, m_downloadsWidget.get());
    });
}

void MainWindow::toggleFullscreen()
{
    if(isFullScreen()) {
        setWindowState(Qt::WindowMaximized | Qt::WindowActive);
    } else {
        setWindowState(Qt::WindowFullScreen | Qt::WindowActive);
    }
}

void MainWindow::handleTabChanged(WebView *view)
{
    Q_ASSERT(view != nullptr);

    m_currentView = view;

    // centralWidget can be a nullptr
    if(centralWidget()) {
        // clear the parent of the central widget so it doesn't get deleted
        centralWidget()->setParent(nullptr);

        // disconnect signals
        disconnect(centralWidget());
    }

    // set new central widget
    setCentralWidget(view);

    // connect signals
    m_backButton->setView(view);
    m_forwardButton->setView(view);
    m_reloadButton->setView(view);
    m_addressBar->setWebView(view);
    connect(view, SIGNAL(titleChanged(QString)), this, SLOT(handleTitleUpdated(QString)));
    connect(view, SIGNAL(linkHovered(QString)), ui->statusBar, SLOT(showMessage(QString)));

    m_progressBar->connectWebView(view);

    // update UI
    this->handleTitleUpdated(view->title());
    centralWidget()->setFocus();
}

void MainWindow::handleTitleUpdated(const QString &title)
{
    QString t = QString::fromStdString(m_config->value<std::string>("browser.window.title").value());
    t.replace("title", title);
    t.replace("profile", tabBar->profile()->name());
    setWindowTitle(t);
    //setWindowTitle(browser->settings()->value("window.title").toString().replace("title", title).replace("profile", tabBar->profile()->name()));
}