/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "web/WebInputEventConversion.h"

#include "core/dom/Touch.h"
#include "core/dom/TouchList.h"
#include "core/events/GestureEvent.h"
#include "core/events/KeyboardEvent.h"
#include "core/events/MouseEvent.h"
#include "core/events/TouchEvent.h"
#include "core/events/WheelEvent.h"
#include "core/frame/FrameHost.h"
#include "core/frame/FrameView.h"
#include "core/frame/VisualViewport.h"
#include "core/layout/api/LayoutItem.h"
#include "core/page/ChromeClient.h"
#include "core/page/Page.h"
#include "platform/KeyboardCodes.h"
#include "platform/Widget.h"
#include "public/platform/Platform.h"

namespace blink {

namespace {
float scaleDeltaToWindow(const Widget* widget, float delta) {
  float scale = 1;
  if (widget) {
    FrameView* rootView = toFrameView(widget->root());
    if (rootView)
      scale = rootView->inputEventsScaleFactor();
  }
  return delta / scale;
}

FloatSize scaleSizeToWindow(const Widget* widget, FloatSize size) {
  return FloatSize(scaleDeltaToWindow(widget, size.width()),
                   scaleDeltaToWindow(widget, size.height()));
}

// This method converts from the renderer's coordinate space into Blink's root
// frame coordinate space.  It's somewhat unique in that it takes into account
// DevTools emulation, which applies a scale and offset in the root layer (see
// updateRootLayerTransform in WebViewImpl) as well as the overscroll effect on
// OSX.  This is in addition to the visual viewport "pinch-zoom" transformation
// and is one of the few cases where the visual viewport is not equal to the
// renderer's coordinate-space.
FloatPoint convertHitPointToRootFrame(const Widget* widget,
                                      FloatPoint pointInRendererViewport) {
  float scale = 1;
  IntSize offset;
  IntPoint visualViewport;
  FloatSize overscrollOffset;
  if (widget) {
    FrameView* rootView = toFrameView(widget->root());
    if (rootView) {
      scale = rootView->inputEventsScaleFactor();
      offset = rootView->inputEventsOffsetForEmulation();
      visualViewport = flooredIntPoint(rootView->page()
                                           ->frameHost()
                                           .visualViewport()
                                           .visibleRect()
                                           .location());
      overscrollOffset =
          rootView->page()->frameHost().chromeClient().elasticOverscroll();
    }
  }
  return FloatPoint((pointInRendererViewport.x() - offset.width()) / scale +
                        visualViewport.x() + overscrollOffset.width(),
                    (pointInRendererViewport.y() - offset.height()) / scale +
                        visualViewport.y() + overscrollOffset.height());
}

PlatformEvent::DispatchType toPlatformDispatchType(
    WebInputEvent::DispatchType type) {
  static_assert(PlatformEvent::DispatchType::Blocking ==
                    static_cast<PlatformEvent::DispatchType>(
                        WebInputEvent::DispatchType::Blocking),
                "Dispatch Types not equal");
  static_assert(PlatformEvent::DispatchType::EventNonBlocking ==
                    static_cast<PlatformEvent::DispatchType>(
                        WebInputEvent::DispatchType::EventNonBlocking),
                "Dispatch Types not equal");
  static_assert(
      PlatformEvent::DispatchType::ListenersNonBlockingPassive ==
          static_cast<PlatformEvent::DispatchType>(
              WebInputEvent::DispatchType::ListenersNonBlockingPassive),
      "Dispatch Types not equal");
  static_assert(
      PlatformEvent::DispatchType::ListenersForcedNonBlockingDueToFling ==
          static_cast<PlatformEvent::DispatchType>(
              WebInputEvent::DispatchType::
                  ListenersForcedNonBlockingDueToFling),
      "Dispatch Types not equal");

  return static_cast<PlatformEvent::DispatchType>(type);
}

unsigned toPlatformModifierFrom(WebMouseEvent::Button button) {
  if (button == WebMouseEvent::Button::NoButton)
    return 0;

  unsigned webMouseButtonToPlatformModifier[] = {
      PlatformEvent::LeftButtonDown, PlatformEvent::MiddleButtonDown,
      PlatformEvent::RightButtonDown};

  return webMouseButtonToPlatformModifier[static_cast<int>(button)];
}

ScrollGranularity toPlatformScrollGranularity(
    WebGestureEvent::ScrollUnits units) {
  switch (units) {
    case WebGestureEvent::ScrollUnits::PrecisePixels:
      return ScrollGranularity::ScrollByPrecisePixel;
    case WebGestureEvent::ScrollUnits::Pixels:
      return ScrollGranularity::ScrollByPixel;
    case WebGestureEvent::ScrollUnits::Page:
      return ScrollGranularity::ScrollByPage;
    default:
      NOTREACHED();
      return ScrollGranularity::ScrollByPrecisePixel;
  }
}

ScrollInertialPhase toPlatformScrollInertialPhase(
    WebGestureEvent::InertialPhaseState state) {
  static_assert(
      ScrollInertialPhaseUnknown == static_cast<ScrollInertialPhase>(
                                        WebGestureEvent::UnknownMomentumPhase),
      "Inertial phases not equal");
  static_assert(
      ScrollInertialPhaseNonMomentum ==
          static_cast<ScrollInertialPhase>(WebGestureEvent::NonMomentumPhase),
      "Inertial phases not equal");
  static_assert(
      ScrollInertialPhaseMomentum ==
          static_cast<ScrollInertialPhase>(WebGestureEvent::MomentumPhase),
      "Inertial phases not equal");

  return static_cast<ScrollInertialPhase>(state);
}

WebGestureEvent::InertialPhaseState toWebGestureInertialPhaseState(
    ScrollInertialPhase state) {
  return static_cast<WebGestureEvent::InertialPhaseState>(state);
}

WebGestureEvent::ScrollUnits toWebGestureScrollUnits(
    ScrollGranularity granularity) {
  switch (granularity) {
    case ScrollGranularity::ScrollByPrecisePixel:
      return WebGestureEvent::ScrollUnits::PrecisePixels;
    case ScrollGranularity::ScrollByPixel:
      return WebGestureEvent::ScrollUnits::Pixels;
    case ScrollGranularity::ScrollByPage:
      return WebGestureEvent::ScrollUnits::Page;
    default:
      NOTREACHED();
      return WebGestureEvent::ScrollUnits::PrecisePixels;
  }
}

}  // namespace

// MakePlatformMouseEvent -----------------------------------------------------

// TODO(mustaq): Add tests for this.
PlatformMouseEventBuilder::PlatformMouseEventBuilder(Widget* widget,
                                                     const WebMouseEvent& e) {
  // FIXME: Widget is always toplevel, unless it's a popup. We may be able
  // to get rid of this once we abstract popups into a WebKit API.
  m_position = widget->convertFromRootFrame(
      flooredIntPoint(convertHitPointToRootFrame(widget, IntPoint(e.x, e.y))));
  m_globalPosition = IntPoint(e.globalX, e.globalY);
  m_movementDelta = IntPoint(scaleDeltaToWindow(widget, e.movementX),
                             scaleDeltaToWindow(widget, e.movementY));
  m_modifiers = e.modifiers;

  m_timestamp = e.timeStampSeconds;
  m_clickCount = e.clickCount;

  m_pointerProperties = static_cast<WebPointerProperties>(e);

  switch (e.type) {
    case WebInputEvent::MouseMove:
    case WebInputEvent::MouseEnter:  // synthesize a move event
    case WebInputEvent::MouseLeave:  // synthesize a move event
      m_type = PlatformEvent::MouseMoved;
      break;

    case WebInputEvent::MouseDown:
      m_type = PlatformEvent::MousePressed;
      break;

    case WebInputEvent::MouseUp:
      m_type = PlatformEvent::MouseReleased;

      // The MouseEvent spec requires that buttons indicates the state
      // immediately after the event takes place. To ensure consistency
      // between platforms here, we explicitly clear the button that is
      // in the process of being released.
      m_modifiers &= ~toPlatformModifierFrom(e.button);
      break;

    default:
      NOTREACHED();
  }
}

// PlatformWheelEventBuilder --------------------------------------------------

PlatformWheelEventBuilder::PlatformWheelEventBuilder(
    Widget* widget,
    const WebMouseWheelEvent& e) {
  m_position = widget->convertFromRootFrame(flooredIntPoint(
      convertHitPointToRootFrame(widget, FloatPoint(e.x, e.y))));
  m_globalPosition = IntPoint(e.globalX, e.globalY);
  m_deltaX = scaleDeltaToWindow(widget, e.deltaX);
  m_deltaY = scaleDeltaToWindow(widget, e.deltaY);
  m_wheelTicksX = e.wheelTicksX;
  m_wheelTicksY = e.wheelTicksY;
  m_granularity =
      e.scrollByPage ? ScrollByPageWheelEvent : ScrollByPixelWheelEvent;

  m_type = PlatformEvent::Wheel;

  m_timestamp = e.timeStampSeconds;
  m_modifiers = e.modifiers;
  m_dispatchType = toPlatformDispatchType(e.dispatchType);

  m_hasPreciseScrollingDeltas = e.hasPreciseScrollingDeltas;
  m_resendingPluginId = e.resendingPluginId;
  m_railsMode = static_cast<PlatformEvent::RailsMode>(e.railsMode);
#if OS(MACOSX)
  m_phase = static_cast<PlatformWheelEventPhase>(e.phase);
  m_momentumPhase = static_cast<PlatformWheelEventPhase>(e.momentumPhase);
#endif
}

// PlatformGestureEventBuilder -----------------------------------------------

PlatformGestureEventBuilder::PlatformGestureEventBuilder(
    Widget* widget,
    const WebGestureEvent& e) {
  switch (e.type) {
    case WebInputEvent::GestureScrollBegin:
      m_type = PlatformEvent::GestureScrollBegin;
      m_data.m_scroll.m_resendingPluginId = e.resendingPluginId;
      m_data.m_scroll.m_deltaX = e.data.scrollBegin.deltaXHint;
      m_data.m_scroll.m_deltaY = e.data.scrollBegin.deltaYHint;
      m_data.m_scroll.m_deltaUnits =
          toPlatformScrollGranularity(e.data.scrollBegin.deltaHintUnits);
      m_data.m_scroll.m_inertialPhase =
          toPlatformScrollInertialPhase(e.data.scrollBegin.inertialPhase);
      m_data.m_scroll.m_synthetic = e.data.scrollBegin.synthetic;
      break;
    case WebInputEvent::GestureScrollEnd:
      m_type = PlatformEvent::GestureScrollEnd;
      m_data.m_scroll.m_resendingPluginId = e.resendingPluginId;
      m_data.m_scroll.m_deltaUnits =
          toPlatformScrollGranularity(e.data.scrollEnd.deltaUnits);
      m_data.m_scroll.m_inertialPhase =
          toPlatformScrollInertialPhase(e.data.scrollEnd.inertialPhase);
      m_data.m_scroll.m_synthetic = e.data.scrollEnd.synthetic;
      break;
    case WebInputEvent::GestureFlingStart:
      m_type = PlatformEvent::GestureFlingStart;
      m_data.m_scroll.m_velocityX = e.data.flingStart.velocityX;
      m_data.m_scroll.m_velocityY = e.data.flingStart.velocityY;
      break;
    case WebInputEvent::GestureScrollUpdate:
      m_type = PlatformEvent::GestureScrollUpdate;
      m_data.m_scroll.m_resendingPluginId = e.resendingPluginId;
      m_data.m_scroll.m_deltaX =
          scaleDeltaToWindow(widget, e.data.scrollUpdate.deltaX);
      m_data.m_scroll.m_deltaY =
          scaleDeltaToWindow(widget, e.data.scrollUpdate.deltaY);
      m_data.m_scroll.m_velocityX = e.data.scrollUpdate.velocityX;
      m_data.m_scroll.m_velocityY = e.data.scrollUpdate.velocityY;
      m_data.m_scroll.m_preventPropagation =
          e.data.scrollUpdate.preventPropagation;
      m_data.m_scroll.m_inertialPhase =
          toPlatformScrollInertialPhase(e.data.scrollUpdate.inertialPhase);
      m_data.m_scroll.m_deltaUnits =
          toPlatformScrollGranularity(e.data.scrollUpdate.deltaUnits);
      break;
    case WebInputEvent::GestureTap:
      m_type = PlatformEvent::GestureTap;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.tap.width, e.data.tap.height)));
      m_data.m_tap.m_tapCount = e.data.tap.tapCount;
      break;
    case WebInputEvent::GestureTapUnconfirmed:
      m_type = PlatformEvent::GestureTapUnconfirmed;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.tap.width, e.data.tap.height)));
      break;
    case WebInputEvent::GestureTapDown:
      m_type = PlatformEvent::GestureTapDown;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.tapDown.width, e.data.tapDown.height)));
      break;
    case WebInputEvent::GestureShowPress:
      m_type = PlatformEvent::GestureShowPress;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.showPress.width, e.data.showPress.height)));
      break;
    case WebInputEvent::GestureTapCancel:
      m_type = PlatformEvent::GestureTapDownCancel;
      break;
    case WebInputEvent::GestureDoubleTap:
      // DoubleTap gesture is now handled as PlatformEvent::GestureTap with
      // tap_count = 2. So no need to convert to a Platfrom DoubleTap gesture.
      // But in WebViewImpl::handleGestureEvent all WebGestureEvent are
      // converted to PlatformGestureEvent, for completeness and not reach the
      // NOTREACHED() at the end, convert the DoubleTap to a NoType.
      m_type = PlatformEvent::NoType;
      break;
    case WebInputEvent::GestureTwoFingerTap:
      m_type = PlatformEvent::GestureTwoFingerTap;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.twoFingerTap.firstFingerWidth,
                            e.data.twoFingerTap.firstFingerHeight)));
      break;
    case WebInputEvent::GestureLongPress:
      m_type = PlatformEvent::GestureLongPress;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.longPress.width, e.data.longPress.height)));
      break;
    case WebInputEvent::GestureLongTap:
      m_type = PlatformEvent::GestureLongTap;
      m_area = expandedIntSize(scaleSizeToWindow(
          widget, FloatSize(e.data.longPress.width, e.data.longPress.height)));
      break;
    case WebInputEvent::GesturePinchBegin:
      m_type = PlatformEvent::GesturePinchBegin;
      break;
    case WebInputEvent::GesturePinchEnd:
      m_type = PlatformEvent::GesturePinchEnd;
      break;
    case WebInputEvent::GesturePinchUpdate:
      m_type = PlatformEvent::GesturePinchUpdate;
      m_data.m_pinchUpdate.m_scale = e.data.pinchUpdate.scale;
      break;
    default:
      NOTREACHED();
  }
  m_position = widget->convertFromRootFrame(flooredIntPoint(
      convertHitPointToRootFrame(widget, FloatPoint(e.x, e.y))));
  m_globalPosition = IntPoint(e.globalX, e.globalY);
  m_timestamp = e.timeStampSeconds;
  m_modifiers = e.modifiers;
  switch (e.sourceDevice) {
    case WebGestureDeviceTouchpad:
      m_source = PlatformGestureSourceTouchpad;
      break;
    case WebGestureDeviceTouchscreen:
      m_source = PlatformGestureSourceTouchscreen;
      break;
    case WebGestureDeviceUninitialized:
      NOTREACHED();
  }

  m_uniqueTouchEventId = e.uniqueTouchEventId;
}

inline PlatformEvent::EventType toPlatformTouchEventType(
    const WebInputEvent::Type type) {
  switch (type) {
    case WebInputEvent::TouchStart:
      return PlatformEvent::TouchStart;
    case WebInputEvent::TouchMove:
      return PlatformEvent::TouchMove;
    case WebInputEvent::TouchEnd:
      return PlatformEvent::TouchEnd;
    case WebInputEvent::TouchCancel:
      return PlatformEvent::TouchCancel;
    case WebInputEvent::TouchScrollStarted:
      return PlatformEvent::TouchScrollStarted;
    default:
      NOTREACHED();
  }
  return PlatformEvent::TouchStart;
}

inline PlatformTouchPoint::TouchState toPlatformTouchPointState(
    const WebTouchPoint::State state) {
  switch (state) {
    case WebTouchPoint::StateReleased:
      return PlatformTouchPoint::TouchReleased;
    case WebTouchPoint::StatePressed:
      return PlatformTouchPoint::TouchPressed;
    case WebTouchPoint::StateMoved:
      return PlatformTouchPoint::TouchMoved;
    case WebTouchPoint::StateStationary:
      return PlatformTouchPoint::TouchStationary;
    case WebTouchPoint::StateCancelled:
      return PlatformTouchPoint::TouchCancelled;
    case WebTouchPoint::StateUndefined:
      NOTREACHED();
  }
  return PlatformTouchPoint::TouchReleased;
}

inline WebTouchPoint::State toWebTouchPointState(const AtomicString& type) {
  if (type == EventTypeNames::touchend)
    return WebTouchPoint::StateReleased;
  if (type == EventTypeNames::touchcancel)
    return WebTouchPoint::StateCancelled;
  if (type == EventTypeNames::touchstart)
    return WebTouchPoint::StatePressed;
  if (type == EventTypeNames::touchmove)
    return WebTouchPoint::StateMoved;
  return WebTouchPoint::StateUndefined;
}

// TODO(mustaq): Add tests for this.
PlatformTouchPointBuilder::PlatformTouchPointBuilder(
    Widget* widget,
    const WebTouchPoint& point) {
  m_pointerProperties = point;
  m_state = toPlatformTouchPointState(point.state);

  FloatPoint floatPos = convertHitPointToRootFrame(widget, point.position);
  IntPoint flooredPoint = flooredIntPoint(floatPos);
  m_pos =
      widget->convertFromRootFrame(flooredPoint) + (floatPos - flooredPoint);

  m_screenPos = FloatPoint(point.screenPosition.x, point.screenPosition.y);
  m_radius = scaleSizeToWindow(widget, FloatSize(point.radiusX, point.radiusY));
  m_rotationAngle = point.rotationAngle;
}

PlatformTouchEventBuilder::PlatformTouchEventBuilder(
    Widget* widget,
    const WebTouchEvent& event) {
  m_type = toPlatformTouchEventType(event.type);
  m_modifiers = event.modifiers;
  m_timestamp = event.timeStampSeconds;
  m_causesScrollingIfUncanceled = event.movedBeyondSlopRegion;
  m_touchStartOrFirstTouchMove = event.touchStartOrFirstTouchMove;

  for (unsigned i = 0; i < event.touchesLength; ++i)
    m_touchPoints.append(PlatformTouchPointBuilder(widget, event.touches[i]));

  m_dispatchType = toPlatformDispatchType(event.dispatchType);
  m_uniqueTouchEventId = event.uniqueTouchEventId;
}

static FloatPoint convertAbsoluteLocationForLayoutObjectFloat(
    const DoublePoint& location,
    const LayoutItem layoutItem) {
  return layoutItem.absoluteToLocal(FloatPoint(location), UseTransforms);
}

static IntPoint convertAbsoluteLocationForLayoutObjectInt(
    const DoublePoint& location,
    const LayoutItem layoutItem) {
  return roundedIntPoint(
      convertAbsoluteLocationForLayoutObjectFloat(location, layoutItem));
}

// FIXME: Change |widget| to const Widget& after RemoteFrames get
// RemoteFrameViews.
static void updateWebMouseEventFromCoreMouseEvent(
    const MouseRelatedEvent& event,
    const Widget* widget,
    const LayoutItem layoutItem,
    WebMouseEvent& webEvent) {
  webEvent.timeStampSeconds = event.platformTimeStamp();
  webEvent.modifiers = event.modifiers();

  FrameView* view = widget ? toFrameView(widget->parent()) : 0;
  // TODO(bokan): If view == nullptr, pointInRootFrame will really be
  // pointInRootContent.
  IntPoint pointInRootFrame(event.absoluteLocation().x(),
                            event.absoluteLocation().y());
  if (view)
    pointInRootFrame = view->contentsToRootFrame(pointInRootFrame);
  webEvent.globalX = event.screenX();
  webEvent.globalY = event.screenY();
  webEvent.windowX = pointInRootFrame.x();
  webEvent.windowY = pointInRootFrame.y();
  IntPoint localPoint = convertAbsoluteLocationForLayoutObjectInt(
      event.absoluteLocation(), layoutItem);
  webEvent.x = localPoint.x();
  webEvent.y = localPoint.y();
}

WebMouseEventBuilder::WebMouseEventBuilder(const Widget* widget,
                                           const LayoutItem layoutItem,
                                           const MouseEvent& event) {
  if (event.type() == EventTypeNames::mousemove)
    type = WebInputEvent::MouseMove;
  else if (event.type() == EventTypeNames::mouseout)
    type = WebInputEvent::MouseLeave;
  else if (event.type() == EventTypeNames::mouseover)
    type = WebInputEvent::MouseEnter;
  else if (event.type() == EventTypeNames::mousedown)
    type = WebInputEvent::MouseDown;
  else if (event.type() == EventTypeNames::mouseup)
    type = WebInputEvent::MouseUp;
  else if (event.type() == EventTypeNames::contextmenu)
    type = WebInputEvent::ContextMenu;
  else
    return;  // Skip all other mouse events.

  updateWebMouseEventFromCoreMouseEvent(event, widget, layoutItem, *this);

  switch (event.button()) {
    case short(WebPointerProperties::Button::Left):
      button = WebMouseEvent::Button::Left;
      break;
    case short(WebPointerProperties::Button::Middle):
      button = WebMouseEvent::Button::Middle;
      break;
    case short(WebPointerProperties::Button::Right):
      button = WebMouseEvent::Button::Right;
      break;
  }
  if (event.buttonDown()) {
    switch (event.button()) {
      case short(WebPointerProperties::Button::Left):
        modifiers |= WebInputEvent::LeftButtonDown;
        break;
      case short(WebPointerProperties::Button::Middle):
        modifiers |= WebInputEvent::MiddleButtonDown;
        break;
      case short(WebPointerProperties::Button::Right):
        modifiers |= WebInputEvent::RightButtonDown;
        break;
    }
  } else {
    button = WebMouseEvent::Button::NoButton;
  }
  movementX = event.movementX();
  movementY = event.movementY();
  clickCount = event.detail();

  pointerType = WebPointerProperties::PointerType::Mouse;
  if (event.mouseEvent())
    pointerType = event.mouseEvent()->pointerProperties().pointerType;
}

// Generate a synthetic WebMouseEvent given a TouchEvent (eg. for emulating a
// mouse with touch input for plugins that don't support touch input).
WebMouseEventBuilder::WebMouseEventBuilder(const Widget* widget,
                                           const LayoutItem layoutItem,
                                           const TouchEvent& event) {
  if (!event.touches())
    return;
  if (event.touches()->length() != 1) {
    if (event.touches()->length() || event.type() != EventTypeNames::touchend ||
        !event.changedTouches() || event.changedTouches()->length() != 1)
      return;
  }

  const Touch* touch = event.touches()->length() == 1
                           ? event.touches()->item(0)
                           : event.changedTouches()->item(0);
  if (touch->identifier())
    return;

  if (event.type() == EventTypeNames::touchstart)
    type = MouseDown;
  else if (event.type() == EventTypeNames::touchmove)
    type = MouseMove;
  else if (event.type() == EventTypeNames::touchend)
    type = MouseUp;
  else
    return;

  timeStampSeconds = event.platformTimeStamp();
  modifiers = event.modifiers();

  // The mouse event co-ordinates should be generated from the co-ordinates of
  // the touch point.
  FrameView* view = toFrameView(widget->parent());
  // FIXME: if view == nullptr, pointInRootFrame will really be
  // pointInRootContent.
  IntPoint pointInRootFrame = roundedIntPoint(touch->absoluteLocation());
  if (view)
    pointInRootFrame = view->contentsToRootFrame(pointInRootFrame);
  IntPoint screenPoint = roundedIntPoint(touch->screenLocation());
  globalX = screenPoint.x();
  globalY = screenPoint.y();
  windowX = pointInRootFrame.x();
  windowY = pointInRootFrame.y();

  button = WebMouseEvent::Button::Left;
  modifiers |= WebInputEvent::LeftButtonDown;
  clickCount = (type == MouseDown || type == MouseUp);

  IntPoint localPoint = convertAbsoluteLocationForLayoutObjectInt(
      DoublePoint(touch->absoluteLocation()), layoutItem);
  x = localPoint.x();
  y = localPoint.y();

  pointerType = WebPointerProperties::PointerType::Touch;
}

WebMouseWheelEventBuilder::WebMouseWheelEventBuilder(
    const Widget* widget,
    const LayoutItem layoutItem,
    const WheelEvent& event) {
  if (event.type() != EventTypeNames::wheel &&
      event.type() != EventTypeNames::mousewheel)
    return;
  type = WebInputEvent::MouseWheel;
  updateWebMouseEventFromCoreMouseEvent(event, widget, layoutItem, *this);
  deltaX = -event.deltaX();
  deltaY = -event.deltaY();
  wheelTicksX = event.ticksX();
  wheelTicksY = event.ticksY();
  scrollByPage = event.deltaMode() == WheelEvent::kDomDeltaPage;
  resendingPluginId = event.resendingPluginId();
  railsMode = static_cast<RailsMode>(event.getRailsMode());
  hasPreciseScrollingDeltas = event.hasPreciseScrollingDeltas();
  dispatchType = event.cancelable() ? WebInputEvent::Blocking
                                    : WebInputEvent::EventNonBlocking;
#if OS(MACOSX)
  phase = static_cast<Phase>(event.phase());
  momentumPhase = static_cast<Phase>(event.momentumPhase());
#endif
}

WebKeyboardEventBuilder::WebKeyboardEventBuilder(const KeyboardEvent& event) {
  if (const WebKeyboardEvent* webEvent = event.keyEvent()) {
    *static_cast<WebKeyboardEvent*>(this) = *webEvent;

    // TODO(dtapuska): DOM KeyboardEvents converted back to WebInputEvents
    // drop the Raw behaviour. Figure out if this is actually really needed.
    if (type == RawKeyDown)
      type = KeyDown;
    return;
  }

  if (event.type() == EventTypeNames::keydown)
    type = KeyDown;
  else if (event.type() == EventTypeNames::keyup)
    type = WebInputEvent::KeyUp;
  else if (event.type() == EventTypeNames::keypress)
    type = WebInputEvent::Char;
  else
    return;  // Skip all other keyboard events.

  modifiers = event.modifiers();
  timeStampSeconds = event.platformTimeStamp();
  windowsKeyCode = event.keyCode();
}

static WebTouchPoint toWebTouchPoint(const Touch* touch,
                                     const LayoutItem layoutItem,
                                     WebTouchPoint::State state,
                                     WebPointerProperties::PointerType type) {
  WebTouchPoint point;
  point.pointerType = type;
  point.id = touch->identifier();
  point.screenPosition = touch->screenLocation();
  point.position = convertAbsoluteLocationForLayoutObjectFloat(
      DoublePoint(touch->absoluteLocation()), layoutItem);
  point.radiusX = touch->radiusX();
  point.radiusY = touch->radiusY();
  point.rotationAngle = touch->rotationAngle();
  point.force = touch->force();
  point.state = state;
  return point;
}

static unsigned indexOfTouchPointWithId(const WebTouchPoint* touchPoints,
                                        unsigned touchPointsLength,
                                        unsigned id) {
  for (unsigned i = 0; i < touchPointsLength; ++i) {
    if (touchPoints[i].id == static_cast<int>(id))
      return i;
  }
  return std::numeric_limits<unsigned>::max();
}

static void addTouchPointsUpdateStateIfNecessary(
    WebTouchPoint::State state,
    TouchList* touches,
    WebTouchPoint* touchPoints,
    unsigned* touchPointsLength,
    const LayoutItem layoutItem,
    WebPointerProperties::PointerType pointerType) {
  unsigned initialTouchPointsLength = *touchPointsLength;
  for (unsigned i = 0; i < touches->length(); ++i) {
    const unsigned pointIndex = *touchPointsLength;
    if (pointIndex >= static_cast<unsigned>(WebTouchEvent::kTouchesLengthCap))
      return;

    const Touch* touch = touches->item(i);
    unsigned existingPointIndex = indexOfTouchPointWithId(
        touchPoints, initialTouchPointsLength, touch->identifier());
    if (existingPointIndex != std::numeric_limits<unsigned>::max()) {
      touchPoints[existingPointIndex].state = state;
    } else {
      touchPoints[pointIndex] =
          toWebTouchPoint(touch, layoutItem, state, pointerType);
      ++(*touchPointsLength);
    }
  }
}

WebTouchEventBuilder::WebTouchEventBuilder(const LayoutItem layoutItem,
                                           const TouchEvent& event) {
  if (event.type() == EventTypeNames::touchstart)
    type = TouchStart;
  else if (event.type() == EventTypeNames::touchmove)
    type = TouchMove;
  else if (event.type() == EventTypeNames::touchend)
    type = TouchEnd;
  else if (event.type() == EventTypeNames::touchcancel)
    type = TouchCancel;
  else {
    NOTREACHED();
    type = Undefined;
    return;
  }

  timeStampSeconds = event.platformTimeStamp();
  modifiers = event.modifiers();
  dispatchType = event.cancelable() ? WebInputEvent::Blocking
                                    : WebInputEvent::EventNonBlocking;
  movedBeyondSlopRegion = event.causesScrollingIfUncanceled();

  // Currently touches[] is empty, add stationary points as-is.
  for (unsigned i = 0;
       i < event.touches()->length() &&
       i < static_cast<unsigned>(WebTouchEvent::kTouchesLengthCap);
       ++i) {
    touches[i] =
        toWebTouchPoint(event.touches()->item(i), layoutItem,
                        WebTouchPoint::StateStationary, event.pointerType());
    ++touchesLength;
  }
  // If any existing points are also in the change list, we should update
  // their state, otherwise just add the new points.
  addTouchPointsUpdateStateIfNecessary(
      toWebTouchPointState(event.type()), event.changedTouches(), touches,
      &touchesLength, layoutItem, event.pointerType());
}

WebGestureEventBuilder::WebGestureEventBuilder(const LayoutItem layoutItem,
                                               const GestureEvent& event) {
  if (event.type() == EventTypeNames::gestureshowpress) {
    type = GestureShowPress;
  } else if (event.type() == EventTypeNames::gesturelongpress) {
    type = GestureLongPress;
  } else if (event.type() == EventTypeNames::gesturetapdown) {
    type = GestureTapDown;
  } else if (event.type() == EventTypeNames::gesturescrollstart) {
    type = GestureScrollBegin;
    resendingPluginId = event.resendingPluginId();
    data.scrollBegin.deltaXHint = event.deltaX();
    data.scrollBegin.deltaYHint = event.deltaY();
    data.scrollBegin.deltaHintUnits =
        toWebGestureScrollUnits(event.deltaUnits());
    data.scrollBegin.inertialPhase =
        toWebGestureInertialPhaseState(event.inertialPhase());
    data.scrollBegin.synthetic = event.synthetic();
  } else if (event.type() == EventTypeNames::gesturescrollend) {
    type = GestureScrollEnd;
    resendingPluginId = event.resendingPluginId();
    data.scrollEnd.deltaUnits = toWebGestureScrollUnits(event.deltaUnits());
    data.scrollEnd.inertialPhase =
        toWebGestureInertialPhaseState(event.inertialPhase());
    data.scrollEnd.synthetic = event.synthetic();
  } else if (event.type() == EventTypeNames::gesturescrollupdate) {
    type = GestureScrollUpdate;
    data.scrollUpdate.deltaUnits = toWebGestureScrollUnits(event.deltaUnits());
    data.scrollUpdate.deltaX = event.deltaX();
    data.scrollUpdate.deltaY = event.deltaY();
    data.scrollUpdate.inertialPhase =
        toWebGestureInertialPhaseState(event.inertialPhase());
    resendingPluginId = event.resendingPluginId();
  } else if (event.type() == EventTypeNames::gestureflingstart) {
    type = GestureFlingStart;
    data.flingStart.velocityX = event.velocityX();
    data.flingStart.velocityY = event.velocityY();
  } else if (event.type() == EventTypeNames::gesturetap) {
    type = GestureTap;
    data.tap.tapCount = 1;
  }

  timeStampSeconds = event.platformTimeStamp();
  modifiers = event.modifiers();

  globalX = event.screenX();
  globalY = event.screenY();
  IntPoint localPoint = convertAbsoluteLocationForLayoutObjectInt(
      event.absoluteLocation(), layoutItem);
  x = localPoint.x();
  y = localPoint.y();

  switch (event.source()) {
    case GestureSourceTouchpad:
      sourceDevice = WebGestureDeviceTouchpad;
      break;
    case GestureSourceTouchscreen:
      sourceDevice = WebGestureDeviceTouchscreen;
      break;
    case GestureSourceUninitialized:
      NOTREACHED();
  }
}

}  // namespace blink