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#include "BrowserWindow.h"

#include <QtCore>

#include <QtGui>

#include <QPropertyAnimation>

#include <QResizeEvent>

#include "BrowserView.h"

#include "HomeView.h"

BrowserWindow::BrowserWindow()

    : m_slidingSurface(new QWidget(this))

    , m_homeView(new HomeView(m_slidingSurface))

    , m_browserView(new BrowserView(m_slidingSurface))

    , m_animation(new QPropertyAnimation(this, "slideValue"))

{

    m_slidingSurface->setAutoFillBackground(true);

    m_homeView->resize(size());

    m_browserView->resize(size());

    connect(m_homeView, SIGNAL(addressEntered(QString)), SLOT(gotoAddress(QString)));

    connect(m_homeView, SIGNAL(urlActivated(QUrl)), SLOT(navigate(QUrl)));

    connect(m_browserView, SIGNAL(menuButtonClicked()), SLOT(showHomeView()));

    m_animation->setDuration(200);

    connect(m_animation, SIGNAL(finished()), SLOT(animationFinished()));

    setSlideValue(0.0f);

}

void BrowserWindow::gotoAddress(const QString &address)

{

    m_browserView->navigate(QUrl::fromUserInput(address));

    showBrowserView();

}

void BrowserWindow::animationFinished()

{

    m_animation->setDirection(QAbstractAnimation::Forward);

}

void BrowserWindow::navigate(const QUrl &url)

{

    m_browserView->navigate(url);

    showBrowserView();

}

void BrowserWindow::setSlideValue(qreal slideRatio)

{

    // we use a ratio to handle resize corectly

    const int pos = -qRound(slideRatio * width());

    m_slidingSurface->scroll(pos - m_browserView->x(), 0);

    if (qFuzzyCompare(slideRatio, static_cast<qreal>(0.0f))) {

        m_browserView->show();

        m_homeView->hide();

    } else if (qFuzzyCompare(slideRatio, static_cast<qreal>(1.0f))) {

        m_homeView->show();

        m_browserView->hide();

    } else {

        m_browserView->show();

        m_homeView->show();

    }

}

qreal BrowserWindow::slideValue() const

{

    Q_ASSERT(m_slidingSurface->x() < width());

    return static_cast<qreal>(qAbs(m_browserView->x())) / width();

}

void BrowserWindow::showHomeView()

{

    m_animation->setStartValue(slideValue());

    m_animation->setEndValue(1.0f);

    m_animation->start();

    m_homeView->setFocus();

}

void BrowserWindow::showBrowserView()

{

    m_animation->setStartValue(slideValue());

    m_animation->setEndValue(0.0f);

    m_animation->start();

    m_browserView->setFocus();

}

void BrowserWindow::keyReleaseEvent(QKeyEvent *event)

{

    QWidget::keyReleaseEvent(event);

    if (event->key() == Qt::Key_F3) {

        if (m_animation->state() == QAbstractAnimation::Running) {

            const QAbstractAnimation::Direction direction =  m_animation->direction() == QAbstractAnimation::Forward

                                                             ? QAbstractAnimation::Forward

                                                                 : QAbstractAnimation::Backward;

            m_animation->setDirection(direction);

        } else if (qFuzzyCompare(slideValue(), static_cast<qreal>(0.0f)))

            showHomeView();

        else

            showBrowserView();

        event->accept();

    }

}

void BrowserWindow::resizeEvent(QResizeEvent *event)

{

    const QSize oldSize = event->oldSize();

    const qreal oldSlidingRatio = static_cast<qreal>(qAbs(m_browserView->x())) / oldSize.width();

    const QSize newSize = event->size();

    m_slidingSurface->resize(newSize.width() * 2, newSize.height());

    m_homeView->resize(newSize);

    m_homeView->move(newSize.width(), 0);

    m_browserView->resize(newSize);

    m_browserView->move(0, 0);

    setSlideValue(oldSlidingRatio);

}