/****************************************************************************

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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the demonstration applications of the Qt Toolkit.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** packaging of this file.  Please review the following information to

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** $QT_END_LICENSE$

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****************************************************************************/

#include "browserapplication.h"

#include "browsermainwindow.h"

#include "cookiejar.h"

#include "downloadmanager.h"

#include "networkaccessmanager.h"

#include "tabwidget.h"

#include "webview.h"

#include <QtGui/QClipboard>

#include <QtGui/QMenu>

#include <QtGui/QMessageBox>

#include <QtGui/QMouseEvent>

#include <QtWebKit/QWebHitTestResult>

#ifndef QT_NO_UITOOLS

#include <QtUiTools/QUiLoader>

#endif  //QT_NO_UITOOLS

#include <QtCore/QDebug>

#include <QtCore/QBuffer>

WebPage::WebPage(QObject *parent)

    : QWebPage(parent)

    , m_keyboardModifiers(Qt::NoModifier)

    , m_pressedButtons(Qt::NoButton)

    , m_openInNewTab(false)

{

    setNetworkAccessManager(BrowserApplication::networkAccessManager());

    connect(this, SIGNAL(unsupportedContent(QNetworkReply*)),

            this, SLOT(handleUnsupportedContent(QNetworkReply*)));

}

BrowserMainWindow *WebPage::mainWindow()

{

    QObject *w = this->parent();

    while (w) {

        if (BrowserMainWindow *mw = qobject_cast<BrowserMainWindow*>(w))

            return mw;

        w = w->parent();

    }

    return BrowserApplication::instance()->mainWindow();

}

bool WebPage::acceptNavigationRequest(QWebFrame *frame, const QNetworkRequest &request, NavigationType type)

{

    // ctrl open in new tab

    // ctrl-shift open in new tab and select

    // ctrl-alt open in new window

    if (type == QWebPage::NavigationTypeLinkClicked

        && (m_keyboardModifiers & Qt::ControlModifier

            || m_pressedButtons == Qt::MidButton)) {

        bool newWindow = (m_keyboardModifiers & Qt::AltModifier);

        WebView *webView;

        if (newWindow) {

            BrowserApplication::instance()->newMainWindow();

            BrowserMainWindow *newMainWindow = BrowserApplication::instance()->mainWindow();

            webView = newMainWindow->currentTab();

            newMainWindow->raise();

            newMainWindow->activateWindow();

            webView->setFocus();

        } else {

            bool selectNewTab = (m_keyboardModifiers & Qt::ShiftModifier);

            webView = mainWindow()->tabWidget()->newTab(selectNewTab);

        }

        webView->load(request);

        m_keyboardModifiers = Qt::NoModifier;

        m_pressedButtons = Qt::NoButton;

        return false;

    }

    if (frame == mainFrame()) {

        m_loadingUrl = request.url();

        emit loadingUrl(m_loadingUrl);

    }

    return QWebPage::acceptNavigationRequest(frame, request, type);

}

QWebPage *WebPage::createWindow(QWebPage::WebWindowType type)

{

    Q_UNUSED(type);

    if (m_keyboardModifiers & Qt::ControlModifier || m_pressedButtons == Qt::MidButton)

        m_openInNewTab = true;

    if (m_openInNewTab) {

        m_openInNewTab = false;

        return mainWindow()->tabWidget()->newTab()->page();

    }

    BrowserApplication::instance()->newMainWindow();

    BrowserMainWindow *mainWindow = BrowserApplication::instance()->mainWindow();

    return mainWindow->currentTab()->page();

}

#if !defined(QT_NO_UITOOLS)

QObject *WebPage::createPlugin(const QString &classId, const QUrl &url, const QStringList &paramNames, const QStringList &paramValues)

{

    Q_UNUSED(url);

    Q_UNUSED(paramNames);

    Q_UNUSED(paramValues);

    QUiLoader loader;

    return loader.createWidget(classId, view());

}

#endif // !defined(QT_NO_UITOOLS)

void WebPage::handleUnsupportedContent(QNetworkReply *reply)

{

    QString errorString = reply->errorString();

    if (m_loadingUrl != reply->url()) {

        // sub resource of this page

        qWarning() << "Resource" << reply->url().toEncoded() << "has unknown Content-Type, will be ignored.";

        reply->deleteLater();

        return;

    }

    if (reply->error() == QNetworkReply::NoError && !reply->header(QNetworkRequest::ContentTypeHeader).isValid()) {

        errorString = "Unknown Content-Type";

    }

    QFile file(QLatin1String(":/notfound.html"));

    bool isOpened = file.open(QIODevice::ReadOnly);

    Q_ASSERT(isOpened);

    Q_UNUSED(isOpened)

    QString title = tr("Error loading page: %1").arg(reply->url().toString());

    QString html = QString(QLatin1String(file.readAll()))

                        .arg(title)

                        .arg(errorString)

                        .arg(reply->url().toString());

    QBuffer imageBuffer;

    imageBuffer.open(QBuffer::ReadWrite);

    QIcon icon = view()->style()->standardIcon(QStyle::SP_MessageBoxWarning, 0, view());

    QPixmap pixmap = icon.pixmap(QSize(32,32));

    if (pixmap.save(&imageBuffer, "PNG")) {

        html.replace(QLatin1String("IMAGE_BINARY_DATA_HERE"),

                     QString(QLatin1String(imageBuffer.buffer().toBase64())));

    }

    QList<QWebFrame*> frames;

    frames.append(mainFrame());

    while (!frames.isEmpty()) {

        QWebFrame *frame = frames.takeFirst();

        if (frame->url() == reply->url()) {

            frame->setHtml(html, reply->url());

            return;

        }

        QList<QWebFrame *> children = frame->childFrames();

        foreach(QWebFrame *frame, children)

            frames.append(frame);

    }

    if (m_loadingUrl == reply->url()) {

        mainFrame()->setHtml(html, reply->url());

    }

}

WebView::WebView(QWidget* parent)

    : QWebView(parent)

    , m_progress(0)

    , m_page(new WebPage(this))

{

    setPage(m_page);

    connect(page(), SIGNAL(statusBarMessage(QString)),

            SLOT(setStatusBarText(QString)));

    connect(this, SIGNAL(loadProgress(int)),

            this, SLOT(setProgress(int)));

    connect(this, SIGNAL(loadFinished(bool)),

            this, SLOT(loadFinished()));

    connect(page(), SIGNAL(loadingUrl(QUrl)),

            this, SIGNAL(urlChanged(QUrl)));

    connect(page(), SIGNAL(downloadRequested(QNetworkRequest)),

            this, SLOT(downloadRequested(QNetworkRequest)));

    page()->setForwardUnsupportedContent(true);

}

void WebView::contextMenuEvent(QContextMenuEvent *event)

{

    QWebHitTestResult r = page()->mainFrame()->hitTestContent(event->pos());

    if (!r.linkUrl().isEmpty()) {

        QMenu menu(this);

        menu.addAction(pageAction(QWebPage::OpenLinkInNewWindow));

        menu.addAction(tr("Open in New Tab"), this, SLOT(openLinkInNewTab()));

        menu.addSeparator();

        menu.addAction(pageAction(QWebPage::DownloadLinkToDisk));

        // Add link to bookmarks...

        menu.addSeparator();

        menu.addAction(pageAction(QWebPage::CopyLinkToClipboard));

        if (page()->settings()->testAttribute(QWebSettings::DeveloperExtrasEnabled))

            menu.addAction(pageAction(QWebPage::InspectElement));

        menu.exec(mapToGlobal(event->pos()));

        return;

    }

    QWebView::contextMenuEvent(event);

}

void WebView::wheelEvent(QWheelEvent *event)

{

    if (QApplication::keyboardModifiers() & Qt::ControlModifier) {

        int numDegrees = event->delta() / 8;

        int numSteps = numDegrees / 15;

        setTextSizeMultiplier(textSizeMultiplier() + numSteps * 0.1);

        event->accept();

        return;

    }

    QWebView::wheelEvent(event);

}

void WebView::openLinkInNewTab()

{

    m_page->m_openInNewTab = true;

    pageAction(QWebPage::OpenLinkInNewWindow)->trigger();

}

void WebView::setProgress(int progress)

{

    m_progress = progress;

}

void WebView::loadFinished()

{

    if (100 != m_progress) {

        qWarning() << "Recieved finished signal while progress is still:" << progress()

                   << "Url:" << url();

    }

    m_progress = 0;

}

void WebView::loadUrl(const QUrl &url)

{

    m_initialUrl = url;

    load(url);

}

QString WebView::lastStatusBarText() const

{

    return m_statusBarText;

}

QUrl WebView::url() const

{

    QUrl url = QWebView::url();

    if (!url.isEmpty())

        return url;

    return m_initialUrl;

}

void WebView::mousePressEvent(QMouseEvent *event)

{

    m_page->m_pressedButtons = event->buttons();

    m_page->m_keyboardModifiers = event->modifiers();

    QWebView::mousePressEvent(event);

}

void WebView::mouseReleaseEvent(QMouseEvent *event)

{

    QWebView::mouseReleaseEvent(event);

    if (!event->isAccepted() && (m_page->m_pressedButtons & Qt::MidButton)) {

        QUrl url(QApplication::clipboard()->text(QClipboard::Selection));

        if (!url.isEmpty() && url.isValid() && !url.scheme().isEmpty()) {

            setUrl(url);

        }

    }

}

void WebView::setStatusBarText(const QString &string)

{

    m_statusBarText = string;

}

void WebView::downloadRequested(const QNetworkRequest &request)

{

    BrowserApplication::downloadManager()->download(request);

}