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#include "render_widget_host_view_qt.h"

#include "backing_store_qt.h"
#include "render_widget_host_view_qt_delegate.h"
#include "web_event_factory.h"

#include "shared/shared_globals.h"

#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/common/gpu/gpu_messages.h"
#include "ui/gfx/size_conversions.h"

#include <QEvent>
#include <QFocusEvent>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QScreen>
#include <QWheelEvent>
#include <QWindow>

RenderWidgetHostViewQt::RenderWidgetHostViewQt(content::RenderWidgetHost* widget)
    : m_host(content::RenderWidgetHostImpl::From(widget))
    , m_delegate(0)
{
    m_host->SetView(this);
}

RenderWidgetHostViewQt::~RenderWidgetHostViewQt()
{
}

bool RenderWidgetHostViewQt::handleEvent(QEvent* event) {

    switch(event->type()) {
    case QEvent::MouseButtonDblClick:
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::MouseMove:
        handleMouseEvent(static_cast<QMouseEvent*>(event));
        break;
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
        handleKeyEvent(static_cast<QKeyEvent*>(event));
        break;
    case QEvent::Wheel:
        handleWheelEvent(static_cast<QWheelEvent*>(event));
        break;
    case QEvent::FocusIn:
    case QEvent::FocusOut:
        handleFocusEvent(static_cast<QFocusEvent*>(event));
        break;
    default:
        return false;
    }
    return true;
}

BackingStoreQt* RenderWidgetHostViewQt::GetBackingStore()
{
    bool force_create = !m_host->empty();
    return static_cast<BackingStoreQt*>(m_host->GetBackingStore(force_create));
}

content::BackingStore *RenderWidgetHostViewQt::AllocBackingStore(const gfx::Size &size)
{
    return new BackingStoreQt(m_host, size, new QWindow);
}

void RenderWidgetHostViewQt::InitAsChild(gfx::NativeView parent_view)
{
}

void RenderWidgetHostViewQt::InitAsPopup(content::RenderWidgetHostView*, const gfx::Rect&)
{
}

void RenderWidgetHostViewQt::InitAsFullscreen(content::RenderWidgetHostView*)
{
}

content::RenderWidgetHost* RenderWidgetHostViewQt::GetRenderWidgetHost() const
{
    return m_host;
}

void RenderWidgetHostViewQt::SetSize(const gfx::Size& size)
{
    int width = size.width();
    int height = size.height();
    // int width = std::min(size.width(), kMaxWindowWidth);
    // int height = std::min(size.height(), kMaxWindowHeight);
    // if (IsPopup())
        // m_delegate->resize(width,height);

    if (m_requestedSize.width() != width ||
        m_requestedSize.height() != height) {
        m_requestedSize = gfx::Size(width, height);
        // m_host->SendScreenRects();
        m_host->WasResized();
    }
}

void RenderWidgetHostViewQt::SetBounds(const gfx::Rect& rect)
{
    // This is called when webkit has sent us a Move message.
    // if (IsPopup())
        // m_delegate->setGeometry(rect.x(), rect.y(), rect.width(), rect.height());
    SetSize(rect.size());
}

gfx::Size RenderWidgetHostViewQt::GetPhysicalBackingSize() const
{
    if (!m_delegate || !m_delegate->window() || !m_delegate->window()->screen())
        return gfx::Size();

    const QScreen* screen = m_delegate->window()->screen();
    return gfx::ToCeiledSize(gfx::ScaleSize(GetViewBounds().size(), screen->devicePixelRatio()));
}

gfx::NativeView RenderWidgetHostViewQt::GetNativeView() const
{
    // gfx::NativeView is a typedef to a platform specific view
    // pointer (HWND, NSView*, GtkWidget*) and other ports use
    // this function in the renderer_host layer when setting up
    // the view hierarchy and for generating snapshots in tests.
    // Since we manage the view hierarchy in Qt we can possibly
    // avoid calls to this.
    QT_NOT_USED
    return gfx::NativeView();
}

gfx::NativeViewId RenderWidgetHostViewQt::GetNativeViewId() const
{
    // This function is used in IPC in place of GetNativeView
    // and we can possibly avoid calls for now.
    QT_NOT_USED
    return m_delegate->window()->winId();
}

gfx::NativeViewAccessible RenderWidgetHostViewQt::GetNativeViewAccessible()
{
    // We are not using accessibility features at this point.
    QT_NOT_USED
    return NULL;
}

// Set focus to the associated View component.
void RenderWidgetHostViewQt::Focus()
{
    m_delegate->setKeyboardFocus();
}

bool RenderWidgetHostViewQt::HasFocus() const
{
    return m_delegate->hasKeyboardFocus();
}

bool RenderWidgetHostViewQt::IsSurfaceAvailableForCopy() const
{
    return true;
}

void RenderWidgetHostViewQt::Show()
{
    m_delegate->show();
}

void RenderWidgetHostViewQt::Hide()
{
    m_delegate->hide();
}

bool RenderWidgetHostViewQt::IsShowing()
{
    return m_delegate->isVisible();
}

// Retrieve the bounds of the View, in screen coordinates.
gfx::Rect RenderWidgetHostViewQt::GetViewBounds() const
{
    QRectF p = m_delegate->screenRect();
    return gfx::Rect(p.x(), p.y(), p.width(), p.height());
}

// Subclasses should override this method to do what is appropriate to set
// the custom background for their platform.
void RenderWidgetHostViewQt::SetBackground(const SkBitmap& background)
{
    RenderWidgetHostViewBase::SetBackground(background);
    // Send(new ViewMsg_SetBackground(m_host->GetRoutingID(), background));
}

// Return value indicates whether the mouse is locked successfully or not.
bool RenderWidgetHostViewQt::LockMouse()
{
    QT_NOT_USED
    return false;
}
void RenderWidgetHostViewQt::UnlockMouse()
{
    QT_NOT_USED
}

// FIXME: remove TOOLKIT_GTK related things.
#if defined(TOOLKIT_GTK)
// Gets the event for the last mouse down.
GdkEventButton* RenderWidgetHostViewQt::GetLastMouseDown()
{
    return 0;
}

gfx::NativeView RenderWidgetHostViewQt::BuildInputMethodsGtkMenu()
{
}
#endif  // defined(TOOLKIT_GTK)

void RenderWidgetHostViewQt::WasShown()
{
    if (m_delegate->isVisible())
        return;

    m_host->WasShown();
}

void RenderWidgetHostViewQt::WasHidden()
{
    if (!m_delegate->isVisible())
        return;

    m_host->WasHidden();
}

void RenderWidgetHostViewQt::MovePluginWindows(const gfx::Vector2d&, const std::vector<webkit::npapi::WebPluginGeometry>&)
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::Blur()
{
    m_host->Blur();
}

void RenderWidgetHostViewQt::UpdateCursor(const WebCursor&)
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::SetIsLoading(bool)
{
    // We use WebContentsDelegateQt::LoadingStateChanged to notify about loading state.
}

void RenderWidgetHostViewQt::TextInputTypeChanged(ui::TextInputType, bool)
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::ImeCancelComposition()
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::ImeCompositionRangeChanged(const ui::Range&, const std::vector<gfx::Rect>&)
{
    // FIXME: not implemented?
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::DidUpdateBackingStore(const gfx::Rect& scroll_rect, const gfx::Vector2d& scroll_delta, const std::vector<gfx::Rect>& copy_rects, const ui::LatencyInfo& /* latency_info */)
{
    if (!m_delegate->isVisible())
        return;

    Paint(scroll_rect);

    for (size_t i = 0; i < copy_rects.size(); ++i) {
        gfx::Rect rect = gfx::SubtractRects(copy_rects[i], scroll_rect);
        if (rect.IsEmpty())
            continue;
        Paint(rect);
    }
}

void RenderWidgetHostViewQt::RenderViewGone(base::TerminationStatus, int)
{
    Destroy();
}

void RenderWidgetHostViewQt::Destroy()
{
    delete m_delegate;
    m_delegate = 0;
}

void RenderWidgetHostViewQt::SetTooltipText(const string16&)
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::SelectionBoundsChanged(const ViewHostMsg_SelectionBounds_Params&)
{
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::ScrollOffsetChanged()
{
    // FIXME: not implemented?
}

void RenderWidgetHostViewQt::CopyFromCompositingSurface(const gfx::Rect& src_subrect, const gfx::Size& /* dst_size */, const base::Callback<void(bool, const SkBitmap&)>& callback)
{
    // Grab the snapshot from the renderer as that's the only reliable way to
    // readback from the GPU for this platform right now.
    // FIXME: is this true?
    GetRenderWidgetHost()->GetSnapshotFromRenderer(src_subrect, callback);
}

void RenderWidgetHostViewQt::CopyFromCompositingSurfaceToVideoFrame(const gfx::Rect& src_subrect, const scoped_refptr<media::VideoFrame>& target, const base::Callback<void(bool)>& callback)
{
    NOTIMPLEMENTED();
    callback.Run(false);
}

bool RenderWidgetHostViewQt::CanCopyToVideoFrame() const
{
    return false;
}

void RenderWidgetHostViewQt::OnAcceleratedCompositingStateChange()
{
    // bool activated = m_host->is_accelerated_compositing_active();
    QT_NOT_YET_IMPLEMENTED
}

void RenderWidgetHostViewQt::AcceleratedSurfaceBuffersSwapped(const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params, int gpu_host_id)
{
    AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
    ack_params.sync_point = 0;
    content::RenderWidgetHostImpl::AcknowledgeBufferPresent(params.route_id, gpu_host_id, ack_params);
}

void RenderWidgetHostViewQt::AcceleratedSurfacePostSubBuffer(const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params, int gpu_host_id)
{
    AcceleratedSurfaceMsg_BufferPresented_Params ack_params;
    ack_params.sync_point = 0;
    content::RenderWidgetHostImpl::AcknowledgeBufferPresent(params.route_id, gpu_host_id, ack_params);
}

void RenderWidgetHostViewQt::AcceleratedSurfaceSuspend()
{
    //FIXME: not implemented?
}

void RenderWidgetHostViewQt::AcceleratedSurfaceRelease()
{
    //FIXME: not implemented?
}

bool RenderWidgetHostViewQt::HasAcceleratedSurface(const gfx::Size&)
{
    return false;
}

void RenderWidgetHostViewQt::GetScreenInfo(WebKit::WebScreenInfo* results)
{
    QWindow* window = m_delegate->window();
    if (!window)
        return;
    GetScreenInfoFromNativeWindow(window, results);
}

gfx::Rect RenderWidgetHostViewQt::GetBoundsInRootWindow()
{
    if (!m_delegate->window())
        return gfx::Rect();

    QRect r = m_delegate->window()->frameGeometry();
    return gfx::Rect(r.x(), r.y(), r.width(), r.height());
}

gfx::GLSurfaceHandle RenderWidgetHostViewQt::GetCompositingSurface()
{
    QT_NOT_YET_IMPLEMENTED
    return gfx::GLSurfaceHandle();
}

void RenderWidgetHostViewQt::SetHasHorizontalScrollbar(bool) { }

void RenderWidgetHostViewQt::SetScrollOffsetPinning(bool, bool) { }

void RenderWidgetHostViewQt::OnAccessibilityNotifications(const std::vector<AccessibilityHostMsg_NotificationParams>&)
{
    // We are not using accessibility features at this point.
    QT_NOT_USED
}

void RenderWidgetHostViewQt::Paint(const gfx::Rect& damage_rect)
{
    QRect r(damage_rect.x(), damage_rect.y(), damage_rect.width(), damage_rect.height());
    m_delegate->update(r);
}

bool RenderWidgetHostViewQt::IsPopup() const
{
    return popup_type_ != WebKit::WebPopupTypeNone;
}

void RenderWidgetHostViewQt::handleMouseEvent(QMouseEvent* ev)
{
    m_host->ForwardMouseEvent(WebEventFactory::toWebMouseEvent(ev));
}

void RenderWidgetHostViewQt::handleKeyEvent(QKeyEvent *ev)
{
    m_host->ForwardKeyboardEvent(WebEventFactory::toWebKeyboardEvent(ev));
}

void RenderWidgetHostViewQt::handleWheelEvent(QWheelEvent *ev)
{
    m_host->ForwardWheelEvent(WebEventFactory::toWebWheelEvent(ev));
}

void RenderWidgetHostViewQt::handleFocusEvent(QFocusEvent *ev)
{
    if (ev->gotFocus()) {
        m_host->GotFocus();
        m_host->SetActive(true);
        ev->accept();
    } else if (ev->lostFocus()) {
        m_host->SetActive(false);
        m_host->Blur();
        ev->accept();
    }
}