// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/renderer/browser_plugin/browser_plugin.h"

#include "base/command_line.h"
#include "base/json/json_string_value_serializer.h"
#include "base/message_loop/message_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "content/common/browser_plugin/browser_plugin_constants.h"
#include "content/common/browser_plugin/browser_plugin_messages.h"
#include "content/common/view_messages.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/renderer/content_renderer_client.h"
#include "content/renderer/browser_plugin/browser_plugin_bindings.h"
#include "content/renderer/browser_plugin/browser_plugin_manager.h"
#include "content/renderer/child_frame_compositing_helper.h"
#include "content/renderer/cursor_utils.h"
#include "content/renderer/drop_data_builder.h"
#include "content/renderer/render_thread_impl.h"
#include "content/renderer/sad_plugin.h"
#include "content/renderer/v8_value_converter_impl.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/web/WebBindings.h"
#include "third_party/WebKit/public/web/WebDOMCustomEvent.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebElement.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebPluginContainer.h"
#include "third_party/WebKit/public/web/WebPluginParams.h"
#include "third_party/WebKit/public/web/WebScriptSource.h"
#include "third_party/WebKit/public/web/WebView.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/events/keycodes/keyboard_codes.h"

#if defined (OS_WIN)
#include "base/sys_info.h"
#endif

using blink::WebCanvas;
using blink::WebPluginContainer;
using blink::WebPluginParams;
using blink::WebPoint;
using blink::WebRect;
using blink::WebURL;
using blink::WebVector;

namespace content {

namespace {

const char* kCustomPersistPartition = "persist:custom_plugin";

static std::string GetInternalEventName(const char* event_name) {
  return base::StringPrintf("-internal-%s", event_name);
}

}  // namespace

BrowserPlugin::BrowserPlugin(RenderViewImpl* render_view,
                             blink::WebFrame* frame,
                             bool auto_navigate)
    : guest_instance_id_(browser_plugin::kInstanceIDNone),
      attached_(false),
      render_view_(render_view->AsWeakPtr()),
      render_view_routing_id_(render_view->GetRoutingID()),
      container_(NULL),
      paint_ack_received_(true),
      last_device_scale_factor_(1.0f),
      sad_guest_(NULL),
      guest_crashed_(false),
      is_auto_size_state_dirty_(false),
      persist_storage_(false),
      valid_partition_id_(true),
      content_window_routing_id_(MSG_ROUTING_NONE),
      plugin_focused_(false),
      visible_(true),
      auto_navigate_(auto_navigate),
      before_first_navigation_(true),
      mouse_locked_(false),
      browser_plugin_manager_(render_view->GetBrowserPluginManager()),
      embedder_frame_url_(frame->document().url()),
      weak_ptr_factory_(this) {
}

BrowserPlugin::~BrowserPlugin() {
  // If the BrowserPlugin has never navigated then the browser process and
  // BrowserPluginManager don't know about it and so there is nothing to do
  // here.
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->RemoveBrowserPlugin(guest_instance_id_);
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_PluginDestroyed(render_view_routing_id_,
                                               guest_instance_id_));
}

bool BrowserPlugin::OnMessageReceived(const IPC::Message& message) {
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(BrowserPlugin, message)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_AdvanceFocus, OnAdvanceFocus)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_Attach_ACK, OnAttachACK)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_BuffersSwapped, OnBuffersSwapped)
    IPC_MESSAGE_HANDLER_GENERIC(BrowserPluginMsg_CompositorFrameSwapped,
                                OnCompositorFrameSwapped(message))
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_CopyFromCompositingSurface,
                        OnCopyFromCompositingSurface)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_GuestContentWindowReady,
                        OnGuestContentWindowReady)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_GuestGone, OnGuestGone)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_SetCursor, OnSetCursor)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_SetMouseLock, OnSetMouseLock)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_ShouldAcceptTouchEvents,
                        OnShouldAcceptTouchEvents)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_UpdatedName, OnUpdatedName)
    IPC_MESSAGE_HANDLER(BrowserPluginMsg_UpdateRect, OnUpdateRect)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

void BrowserPlugin::UpdateDOMAttribute(const std::string& attribute_name,
                                       const std::string& attribute_value) {
  if (!container())
    return;

  blink::WebElement element = container()->element();
  blink::WebString web_attribute_name =
      blink::WebString::fromUTF8(attribute_name);
  if (!HasDOMAttribute(attribute_name) ||
      (std::string(element.getAttribute(web_attribute_name).utf8()) !=
          attribute_value)) {
    element.setAttribute(web_attribute_name,
        blink::WebString::fromUTF8(attribute_value));
  }
}

void BrowserPlugin::RemoveDOMAttribute(const std::string& attribute_name) {
  if (!container())
    return;

  container()->element().removeAttribute(
      blink::WebString::fromUTF8(attribute_name));
}

std::string BrowserPlugin::GetDOMAttributeValue(
    const std::string& attribute_name) const {
  if (!container())
    return std::string();

  return container()->element().getAttribute(
      blink::WebString::fromUTF8(attribute_name)).utf8();
}

bool BrowserPlugin::HasDOMAttribute(const std::string& attribute_name) const {
  if (!container())
    return false;

  return container()->element().hasAttribute(
      blink::WebString::fromUTF8(attribute_name));
}

std::string BrowserPlugin::GetNameAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributeName);
}

bool BrowserPlugin::GetAllowTransparencyAttribute() const {
  return HasDOMAttribute(browser_plugin::kAttributeAllowTransparency);
}

std::string BrowserPlugin::GetSrcAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributeSrc);
}

bool BrowserPlugin::GetAutoSizeAttribute() const {
  return HasDOMAttribute(browser_plugin::kAttributeAutoSize);
}

int BrowserPlugin::GetMaxHeightAttribute() const {
  int max_height;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMaxHeight),
                    &max_height);
  return max_height;
}

int BrowserPlugin::GetMaxWidthAttribute() const {
  int max_width;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMaxWidth),
                    &max_width);
  return max_width;
}

int BrowserPlugin::GetMinHeightAttribute() const {
  int min_height;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMinHeight),
                    &min_height);
  return min_height;
}

int BrowserPlugin::GetMinWidthAttribute() const {
  int min_width;
  base::StringToInt(GetDOMAttributeValue(browser_plugin::kAttributeMinWidth),
                    &min_width);
  return min_width;
}

int BrowserPlugin::GetAdjustedMaxHeight() const {
  int max_height = GetMaxHeightAttribute();
  return max_height ? max_height : height();
}

int BrowserPlugin::GetAdjustedMaxWidth() const {
  int max_width = GetMaxWidthAttribute();
  return max_width ? max_width : width();
}

int BrowserPlugin::GetAdjustedMinHeight() const {
  int min_height = GetMinHeightAttribute();
  // FrameView.cpp does not allow this value to be <= 0, so when the value is
  // unset (or set to 0), we set it to the container size.
  min_height = min_height ? min_height : height();
  // For autosize, minHeight should not be bigger than maxHeight.
  return std::min(min_height, GetAdjustedMaxHeight());
}

int BrowserPlugin::GetAdjustedMinWidth() const {
  int min_width = GetMinWidthAttribute();
  // FrameView.cpp does not allow this value to be <= 0, so when the value is
  // unset (or set to 0), we set it to the container size.
  min_width = min_width ? min_width : width();
  // For autosize, minWidth should not be bigger than maxWidth.
  return std::min(min_width, GetAdjustedMaxWidth());
}

std::string BrowserPlugin::GetPartitionAttribute() const {
  return GetDOMAttributeValue(browser_plugin::kAttributePartition);
}

void BrowserPlugin::ParseNameAttribute() {
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_SetName(render_view_routing_id_,
                                       guest_instance_id_,
                                       GetNameAttribute()));
}

void BrowserPlugin::ParseAllowTransparencyAttribute() {
  if (!HasGuestInstanceID())
    return;

  bool opaque = !GetAllowTransparencyAttribute();

  if (compositing_helper_)
    compositing_helper_->SetContentsOpaque(opaque);

  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetContentsOpaque(
        render_view_routing_id_,
        guest_instance_id_,
        opaque));
}

bool BrowserPlugin::ParseSrcAttribute(std::string* error_message) {
  if (!valid_partition_id_) {
    *error_message = browser_plugin::kErrorInvalidPartition;
    return false;
  }
  std::string src = GetSrcAttribute();
  if (src.empty())
    return true;

  // If we haven't created the guest yet, do so now. We will navigate it right
  // after creation. If |src| is empty, we can delay the creation until we
  // actually need it.
  if (!HasGuestInstanceID()) {
    // On initial navigation, we request an instance ID from the browser
    // process. We essentially ignore all subsequent calls to SetSrcAttribute
    // until we receive an instance ID. |before_first_navigation_|
    // prevents BrowserPlugin from allocating more than one instance ID.
    // Upon receiving an instance ID from the browser process, we continue
    // the process of navigation by populating the
    // BrowserPluginHostMsg_Attach_Params with the current state of
    // BrowserPlugin and sending a BrowserPluginHostMsg_CreateGuest to the
    // browser process in order to create a new guest.
    if (before_first_navigation_) {
      browser_plugin_manager()->AllocateInstanceID(
          weak_ptr_factory_.GetWeakPtr());
      before_first_navigation_ = false;
    }
    return true;
  }

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_NavigateGuest(render_view_routing_id_,
                                             guest_instance_id_,
                                             src));
  return true;
}

void BrowserPlugin::ParseAutoSizeAttribute() {
  last_view_size_ = plugin_rect_.size();
  is_auto_size_state_dirty_ = true;
  UpdateGuestAutoSizeState(GetAutoSizeAttribute());
}

void BrowserPlugin::PopulateAutoSizeParameters(
    BrowserPluginHostMsg_AutoSize_Params* params, bool auto_size_enabled) {
  params->enable = auto_size_enabled;
  // No need to populate the params if autosize is off.
  if (auto_size_enabled) {
    params->max_size = gfx::Size(GetAdjustedMaxWidth(), GetAdjustedMaxHeight());
    params->min_size = gfx::Size(GetAdjustedMinWidth(), GetAdjustedMinHeight());

    if (max_auto_size_ != params->max_size)
      is_auto_size_state_dirty_ = true;

    max_auto_size_ = params->max_size;
  } else {
    max_auto_size_ = gfx::Size();
  }
}

void BrowserPlugin::UpdateGuestAutoSizeState(bool auto_size_enabled) {
  // If we haven't yet heard back from the guest about the last resize request,
  // then we don't issue another request until we do in
  // BrowserPlugin::OnUpdateRect.
  if (!HasGuestInstanceID() || !paint_ack_received_)
    return;

  BrowserPluginHostMsg_AutoSize_Params auto_size_params;
  BrowserPluginHostMsg_ResizeGuest_Params resize_guest_params;
  if (auto_size_enabled) {
    GetSizeParams(&auto_size_params, &resize_guest_params, true);
  } else {
    GetSizeParams(NULL, &resize_guest_params, true);
  }
  paint_ack_received_ = false;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_SetAutoSize(render_view_routing_id_,
                                           guest_instance_id_,
                                           auto_size_params,
                                           resize_guest_params));
}

void BrowserPlugin::OnInstanceIDAllocated(int guest_instance_id) {
  CHECK(guest_instance_id != browser_plugin::kInstanceIDNone);

  if (auto_navigate_) {
    scoped_ptr<base::DictionaryValue> params(new base::DictionaryValue());
    Attach(guest_instance_id, params.Pass());
    return;
  }

  std::map<std::string, base::Value*> props;
  props[browser_plugin::kWindowID] =
      new base::FundamentalValue(guest_instance_id);
  TriggerEvent(browser_plugin::kEventInternalInstanceIDAllocated, &props);
}

void BrowserPlugin::Attach(int guest_instance_id,
                           scoped_ptr<base::DictionaryValue> extra_params) {
  CHECK(guest_instance_id != browser_plugin::kInstanceIDNone);

  // If this BrowserPlugin is already attached to a guest, then do nothing.
  if (HasGuestInstanceID())
    return;

  // This API may be called directly without setting the src attribute.
  // In that case, we need to make sure we don't allocate another instance ID.
  before_first_navigation_ = false;
  guest_instance_id_ = guest_instance_id;
  browser_plugin_manager()->AddBrowserPlugin(guest_instance_id, this);

  BrowserPluginHostMsg_Attach_Params attach_params;
  attach_params.focused = ShouldGuestBeFocused();
  attach_params.visible = visible_;
  attach_params.opaque = !GetAllowTransparencyAttribute();
  attach_params.name = GetNameAttribute();
  attach_params.storage_partition_id = storage_partition_id_;
  attach_params.persist_storage = persist_storage_;
  attach_params.src = GetSrcAttribute();
  attach_params.embedder_frame_url = embedder_frame_url_;
  GetSizeParams(&attach_params.auto_size_params,
                &attach_params.resize_guest_params,
                false);

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_Attach(render_view_routing_id_,
                                      guest_instance_id_, attach_params,
                                      *extra_params));
}

void BrowserPlugin::DidCommitCompositorFrame() {
  if (compositing_helper_.get())
    compositing_helper_->DidCommitCompositorFrame();
}

void BrowserPlugin::OnAdvanceFocus(int guest_instance_id, bool reverse) {
  DCHECK(render_view_.get());
  render_view_->GetWebView()->advanceFocus(reverse);
}

void BrowserPlugin::OnAttachACK(
    int guest_instance_id,
    const BrowserPluginMsg_Attach_ACK_Params& params) {
  // Update BrowserPlugin attributes to match the state of the guest.
  if (!params.name.empty())
    OnUpdatedName(guest_instance_id, params.name);
  if (!params.storage_partition_id.empty()) {
    std::string partition_name =
        (params.persist_storage ? browser_plugin::kPersistPrefix : "") +
            params.storage_partition_id;
    UpdateDOMAttribute(browser_plugin::kAttributePartition, partition_name);
  }
  attached_ = true;
}

void BrowserPlugin::OnBuffersSwapped(
    int instance_id,
    const FrameMsg_BuffersSwapped_Params& params) {
  EnableCompositing(true);

  compositing_helper_->OnBuffersSwapped(params.size,
                                        params.mailbox,
                                        params.gpu_route_id,
                                        params.gpu_host_id,
                                        GetDeviceScaleFactor());
}

void BrowserPlugin::OnCompositorFrameSwapped(const IPC::Message& message) {
  BrowserPluginMsg_CompositorFrameSwapped::Param param;
  if (!BrowserPluginMsg_CompositorFrameSwapped::Read(&message, &param))
    return;
  scoped_ptr<cc::CompositorFrame> frame(new cc::CompositorFrame);
  param.b.frame.AssignTo(frame.get());

  EnableCompositing(true);
  compositing_helper_->OnCompositorFrameSwapped(frame.Pass(),
                                                param.b.producing_route_id,
                                                param.b.output_surface_id,
                                                param.b.producing_host_id,
                                                param.b.shared_memory_handle);
}

void BrowserPlugin::OnCopyFromCompositingSurface(int guest_instance_id,
                                                 int request_id,
                                                 gfx::Rect source_rect,
                                                 gfx::Size dest_size) {
  if (!compositing_helper_) {
    browser_plugin_manager()->Send(
        new BrowserPluginHostMsg_CopyFromCompositingSurfaceAck(
            render_view_routing_id_,
            guest_instance_id_,
            request_id,
            SkBitmap()));
    return;
  }
  compositing_helper_->CopyFromCompositingSurface(request_id, source_rect,
                                                  dest_size);
}

void BrowserPlugin::OnGuestContentWindowReady(int guest_instance_id,
                                              int content_window_routing_id) {
  DCHECK(content_window_routing_id != MSG_ROUTING_NONE);
  content_window_routing_id_ = content_window_routing_id;
}

void BrowserPlugin::OnGuestGone(int guest_instance_id) {
  guest_crashed_ = true;

  // Turn off compositing so we can display the sad graphic. Changes to
  // compositing state will show up at a later time after a layout and commit.
  EnableCompositing(false);

  // Queue up showing the sad graphic to give content embedders an opportunity
  // to fire their listeners and potentially overlay the webview with custom
  // behavior. If the BrowserPlugin is destroyed in the meantime, then the
  // task will not be executed.
  base::MessageLoop::current()->PostTask(
      FROM_HERE,
      base::Bind(&BrowserPlugin::ShowSadGraphic,
                 weak_ptr_factory_.GetWeakPtr()));
}

void BrowserPlugin::OnSetCursor(int guest_instance_id,
                                const WebCursor& cursor) {
  cursor_ = cursor;
}

void BrowserPlugin::OnSetMouseLock(int guest_instance_id,
                                   bool enable) {
  if (enable) {
    if (mouse_locked_)
      return;
    render_view_->mouse_lock_dispatcher()->LockMouse(this);
  } else {
    if (!mouse_locked_) {
      OnLockMouseACK(false);
      return;
    }
    render_view_->mouse_lock_dispatcher()->UnlockMouse(this);
  }
}

void BrowserPlugin::OnShouldAcceptTouchEvents(int guest_instance_id,
                                              bool accept) {
  if (container()) {
    container()->requestTouchEventType(accept ?
        blink::WebPluginContainer::TouchEventRequestTypeRaw :
        blink::WebPluginContainer::TouchEventRequestTypeNone);
  }
}

void BrowserPlugin::OnUpdatedName(int guest_instance_id,
                                  const std::string& name) {
  UpdateDOMAttribute(browser_plugin::kAttributeName, name);
}

void BrowserPlugin::OnUpdateRect(
    int guest_instance_id,
    const BrowserPluginMsg_UpdateRect_Params& params) {
  // Note that there is no need to send ACK for this message.
  // If the guest has updated pixels then it is no longer crashed.
  guest_crashed_ = false;

  bool auto_size = GetAutoSizeAttribute();
  // We receive a resize ACK in regular mode, but not in autosize.
  // In Compositing mode, we need to do it here so we can continue sending
  // resize messages when needed.
  if (params.is_resize_ack || (auto_size || is_auto_size_state_dirty_))
    paint_ack_received_ = true;

  bool was_auto_size_state_dirty = auto_size && is_auto_size_state_dirty_;
  is_auto_size_state_dirty_ = false;

  if ((!auto_size && (width() != params.view_size.width() ||
                      height() != params.view_size.height())) ||
      (auto_size && was_auto_size_state_dirty) ||
      GetDeviceScaleFactor() != params.scale_factor) {
    UpdateGuestAutoSizeState(auto_size);
    return;
  }

  if (auto_size && (params.view_size != last_view_size_))
    last_view_size_ = params.view_size;

  BrowserPluginHostMsg_AutoSize_Params auto_size_params;
  BrowserPluginHostMsg_ResizeGuest_Params resize_guest_params;

  // BrowserPluginHostMsg_UpdateRect_ACK is used by both the compositing and
  // software paths to piggyback updated autosize parameters.
  if (auto_size)
    PopulateAutoSizeParameters(&auto_size_params, auto_size);

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_SetAutoSize(render_view_routing_id_,
                                           guest_instance_id_,
                                           auto_size_params,
                                           resize_guest_params));
}

void BrowserPlugin::ParseSizeContraintsChanged() {
  bool auto_size = GetAutoSizeAttribute();
  if (auto_size) {
    is_auto_size_state_dirty_ = true;
    UpdateGuestAutoSizeState(true);
  }
}

bool BrowserPlugin::InAutoSizeBounds(const gfx::Size& size) const {
  return size.width() <= GetAdjustedMaxWidth() &&
      size.height() <= GetAdjustedMaxHeight();
}

NPObject* BrowserPlugin::GetContentWindow() const {
  if (content_window_routing_id_ == MSG_ROUTING_NONE)
    return NULL;
  RenderViewImpl* guest_render_view = RenderViewImpl::FromRoutingID(
      content_window_routing_id_);
  if (!guest_render_view)
    return NULL;
  blink::WebFrame* guest_frame = guest_render_view->GetWebView()->mainFrame();
  return guest_frame->windowObject();
}

bool BrowserPlugin::HasNavigated() const {
  return !before_first_navigation_;
}

bool BrowserPlugin::HasGuestInstanceID() const {
  return guest_instance_id_ != browser_plugin::kInstanceIDNone;
}

bool BrowserPlugin::ParsePartitionAttribute(std::string* error_message) {
  if (HasNavigated()) {
    *error_message = browser_plugin::kErrorAlreadyNavigated;
    return false;
  }

  std::string input;
  if (auto_navigate_)
    input = kCustomPersistPartition;
  else
    input = GetPartitionAttribute();

  // Since the "persist:" prefix is in ASCII, StartsWith will work fine on
  // UTF-8 encoded |partition_id|. If the prefix is a match, we can safely
  // remove the prefix without splicing in the middle of a multi-byte codepoint.
  // We can use the rest of the string as UTF-8 encoded one.
  if (StartsWithASCII(input, browser_plugin::kPersistPrefix, true)) {
    size_t index = input.find(":");
    CHECK(index != std::string::npos);
    // It is safe to do index + 1, since we tested for the full prefix above.
    input = input.substr(index + 1);
    if (input.empty()) {
      valid_partition_id_ = false;
      *error_message = browser_plugin::kErrorInvalidPartition;
      return false;
    }
    persist_storage_ = true;
  } else {
    persist_storage_ = false;
  }

  valid_partition_id_ = true;
  storage_partition_id_ = input;
  return true;
}

bool BrowserPlugin::CanRemovePartitionAttribute(std::string* error_message) {
  if (HasGuestInstanceID())
    *error_message = browser_plugin::kErrorCannotRemovePartition;
  return !HasGuestInstanceID();
}

void BrowserPlugin::ShowSadGraphic() {
  // If the BrowserPlugin is scheduled to be deleted, then container_ will be
  // NULL so we shouldn't attempt to access it.
  if (container_)
    container_->invalidate();
}

void BrowserPlugin::ParseAttributes() {
  // TODO(mthiesse): Handle errors here?
  std::string error;
  ParsePartitionAttribute(&error);

  // Parse the 'src' attribute last, as it will set the has_navigated_ flag to
  // true, which prevents changing the 'partition' attribute.
  ParseSrcAttribute(&error);
}

float BrowserPlugin::GetDeviceScaleFactor() const {
  if (!render_view_.get())
    return 1.0f;
  return render_view_->GetWebView()->deviceScaleFactor();
}

void BrowserPlugin::UpdateDeviceScaleFactor(float device_scale_factor) {
  if (last_device_scale_factor_ == device_scale_factor || !paint_ack_received_)
    return;

  BrowserPluginHostMsg_ResizeGuest_Params params;
  PopulateResizeGuestParameters(&params, plugin_rect(), false);
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ResizeGuest(
      render_view_routing_id_,
      guest_instance_id_,
      params));
}

void BrowserPlugin::TriggerEvent(const std::string& event_name,
                                 std::map<std::string, base::Value*>* props) {
  if (!container())
    return;

  blink::WebLocalFrame* frame = container()->element().document().frame();
  if (!frame)
    return;

  v8::HandleScope handle_scope(v8::Isolate::GetCurrent());
  v8::Local<v8::Context> context = frame->mainWorldScriptContext();
  v8::Context::Scope context_scope(context);

  std::string json_string;
  if (props) {
    base::DictionaryValue dict;
    for (std::map<std::string, base::Value*>::iterator iter = props->begin(),
             end = props->end(); iter != end; ++iter) {
      dict.Set(iter->first, iter->second);
    }

    JSONStringValueSerializer serializer(&json_string);
    if (!serializer.Serialize(dict))
      return;
  }

  blink::WebDOMEvent dom_event = frame->document().createEvent("CustomEvent");
  blink::WebDOMCustomEvent event = dom_event.to<blink::WebDOMCustomEvent>();

  // The events triggered directly from the plugin <object> are internal events
  // whose implementation details can (and likely will) change over time. The
  // wrapper/shim (e.g. <webview> tag) should receive these events, and expose a
  // more appropriate (and stable) event to the consumers as part of the API.
  event.initCustomEvent(
      blink::WebString::fromUTF8(GetInternalEventName(event_name.c_str())),
      false,
      false,
      blink::WebSerializedScriptValue::serialize(
          v8::String::NewFromUtf8(context->GetIsolate(),
                                  json_string.c_str(),
                                  v8::String::kNormalString,
                                  json_string.size())));
  container()->element().dispatchEvent(event);
}

void BrowserPlugin::UpdateGuestFocusState() {
  if (!HasGuestInstanceID())
    return;
  bool should_be_focused = ShouldGuestBeFocused();
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetFocus(
      render_view_routing_id_,
      guest_instance_id_,
      should_be_focused));
}

bool BrowserPlugin::ShouldGuestBeFocused() const {
  bool embedder_focused = false;
  if (render_view_.get())
    embedder_focused = render_view_->has_focus();
  return plugin_focused_ && embedder_focused;
}

blink::WebPluginContainer* BrowserPlugin::container() const {
  return container_;
}

bool BrowserPlugin::initialize(WebPluginContainer* container) {
  if (!container)
    return false;

  if (!GetContentClient()->renderer()->AllowBrowserPlugin(container) &&
      !auto_navigate_)
    return false;

  // Tell |container| to allow this plugin to use script objects.
  npp_.reset(new NPP_t);
  container->allowScriptObjects();

  bindings_.reset(new BrowserPluginBindings(this));
  container_ = container;
  container_->setWantsWheelEvents(true);
  ParseAttributes();
  return true;
}

void BrowserPlugin::EnableCompositing(bool enable) {
  bool enabled = !!compositing_helper_;
  if (enabled == enable)
    return;

  if (enable) {
    DCHECK(!compositing_helper_.get());
    if (!compositing_helper_.get()) {
      compositing_helper_ =
          ChildFrameCompositingHelper::CreateCompositingHelperForBrowserPlugin(
              weak_ptr_factory_.GetWeakPtr());
    }
  }
  compositing_helper_->EnableCompositing(enable);
  compositing_helper_->SetContentsOpaque(!GetAllowTransparencyAttribute());

  if (!enable) {
    DCHECK(compositing_helper_.get());
    compositing_helper_->OnContainerDestroy();
    compositing_helper_ = NULL;
  }
}

void BrowserPlugin::destroy() {
  // If the plugin was initialized then it has a valid |npp_| identifier, and
  // the |container_| must clear references to the plugin's script objects.
  DCHECK(!npp_ || container_);
  if (container_)
    container_->clearScriptObjects();

  if (compositing_helper_.get())
    compositing_helper_->OnContainerDestroy();
  container_ = NULL;
  // Will be a no-op if the mouse is not currently locked.
  if (render_view_.get())
    render_view_->mouse_lock_dispatcher()->OnLockTargetDestroyed(this);
  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}

NPObject* BrowserPlugin::scriptableObject() {
  if (!bindings_)
    return NULL;

  NPObject* browser_plugin_np_object(bindings_->np_object());
  // The object is expected to be retained before it is returned.
  blink::WebBindings::retainObject(browser_plugin_np_object);
  return browser_plugin_np_object;
}

NPP BrowserPlugin::pluginNPP() {
  return npp_.get();
}

bool BrowserPlugin::supportsKeyboardFocus() const {
  return true;
}

bool BrowserPlugin::supportsEditCommands() const {
  return true;
}

bool BrowserPlugin::supportsInputMethod() const {
  return true;
}

bool BrowserPlugin::canProcessDrag() const {
  return true;
}

void BrowserPlugin::paint(WebCanvas* canvas, const WebRect& rect) {
  if (guest_crashed_) {
    if (!sad_guest_)  // Lazily initialize bitmap.
      sad_guest_ = content::GetContentClient()->renderer()->
          GetSadWebViewBitmap();
    // content_shell does not have the sad plugin bitmap, so we'll paint black
    // instead to make it clear that something went wrong.
    if (sad_guest_) {
      PaintSadPlugin(canvas, plugin_rect_, *sad_guest_);
      return;
    }
  }
  SkAutoCanvasRestore auto_restore(canvas, true);
  canvas->translate(plugin_rect_.x(), plugin_rect_.y());
  SkRect image_data_rect = SkRect::MakeXYWH(
      SkIntToScalar(0),
      SkIntToScalar(0),
      SkIntToScalar(plugin_rect_.width()),
      SkIntToScalar(plugin_rect_.height()));
  canvas->clipRect(image_data_rect);
  // Paint black or white in case we have nothing in our backing store or we
  // need to show a gutter.
  SkPaint paint;
  paint.setStyle(SkPaint::kFill_Style);
  paint.setColor(guest_crashed_ ? SK_ColorBLACK : SK_ColorWHITE);
  canvas->drawRect(image_data_rect, paint);
}

// static
bool BrowserPlugin::ShouldForwardToBrowserPlugin(
    const IPC::Message& message) {
  switch (message.type()) {
    case BrowserPluginMsg_AdvanceFocus::ID:
    case BrowserPluginMsg_Attach_ACK::ID:
    case BrowserPluginMsg_BuffersSwapped::ID:
    case BrowserPluginMsg_CompositorFrameSwapped::ID:
    case BrowserPluginMsg_CopyFromCompositingSurface::ID:
    case BrowserPluginMsg_GuestContentWindowReady::ID:
    case BrowserPluginMsg_GuestGone::ID:
    case BrowserPluginMsg_SetCursor::ID:
    case BrowserPluginMsg_SetMouseLock::ID:
    case BrowserPluginMsg_ShouldAcceptTouchEvents::ID:
    case BrowserPluginMsg_UpdatedName::ID:
    case BrowserPluginMsg_UpdateRect::ID:
      return true;
    default:
      break;
  }
  return false;
}

void BrowserPlugin::updateGeometry(
    const WebRect& window_rect,
    const WebRect& clip_rect,
    const WebVector<WebRect>& cut_outs_rects,
    bool is_visible) {
  int old_width = width();
  int old_height = height();
  plugin_rect_ = window_rect;
  if (!attached())
    return;

  // In AutoSize mode, guests don't care when the BrowserPlugin container is
  // resized. If |!paint_ack_received_|, then we are still waiting on a
  // previous resize to be ACK'ed and so we don't issue additional resizes
  // until the previous one is ACK'ed.
  // TODO(mthiesse): Assess the performance of calling GetAutoSizeAttribute() on
  // resize.
  if (!paint_ack_received_ ||
      (old_width == window_rect.width && old_height == window_rect.height) ||
      GetAutoSizeAttribute()) {
    // Let the browser know about the updated view rect.
    browser_plugin_manager()->Send(new BrowserPluginHostMsg_UpdateGeometry(
        render_view_routing_id_, guest_instance_id_, plugin_rect_));
    return;
  }

  BrowserPluginHostMsg_ResizeGuest_Params params;
  PopulateResizeGuestParameters(&params, plugin_rect(), false);
  paint_ack_received_ = false;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ResizeGuest(
      render_view_routing_id_,
      guest_instance_id_,
      params));
}

void BrowserPlugin::PopulateResizeGuestParameters(
    BrowserPluginHostMsg_ResizeGuest_Params* params,
    const gfx::Rect& view_rect,
    bool needs_repaint) {
  params->size_changed = true;
  params->view_rect = view_rect;
  params->repaint = needs_repaint;
  params->scale_factor = GetDeviceScaleFactor();
  if (last_device_scale_factor_ != params->scale_factor){
    params->repaint = true;
    last_device_scale_factor_ = params->scale_factor;
  }
}

void BrowserPlugin::GetSizeParams(
    BrowserPluginHostMsg_AutoSize_Params* auto_size_params,
    BrowserPluginHostMsg_ResizeGuest_Params* resize_guest_params,
    bool needs_repaint) {
  if (auto_size_params) {
    PopulateAutoSizeParameters(auto_size_params, GetAutoSizeAttribute());
  } else {
    max_auto_size_ = gfx::Size();
  }
  gfx::Size view_size = (auto_size_params && auto_size_params->enable) ?
      auto_size_params->max_size : gfx::Size(width(), height());
  if (view_size.IsEmpty())
    return;
  paint_ack_received_ = false;
  gfx::Rect view_rect = gfx::Rect(plugin_rect_.origin(), view_size);
  PopulateResizeGuestParameters(resize_guest_params, view_rect, needs_repaint);
}

void BrowserPlugin::updateFocus(bool focused) {
  plugin_focused_ = focused;
  UpdateGuestFocusState();
}

void BrowserPlugin::updateVisibility(bool visible) {
  if (visible_ == visible)
    return;

  visible_ = visible;
  if (!HasGuestInstanceID())
    return;

  if (compositing_helper_.get())
    compositing_helper_->UpdateVisibility(visible);

  browser_plugin_manager()->Send(new BrowserPluginHostMsg_SetVisibility(
      render_view_routing_id_,
      guest_instance_id_,
      visible));
}

bool BrowserPlugin::acceptsInputEvents() {
  return true;
}

bool BrowserPlugin::handleInputEvent(const blink::WebInputEvent& event,
                                     blink::WebCursorInfo& cursor_info) {
  if (guest_crashed_ || !HasGuestInstanceID())
    return false;

  if (event.type == blink::WebInputEvent::ContextMenu)
    return true;

  const blink::WebInputEvent* modified_event = &event;
  scoped_ptr<blink::WebTouchEvent> touch_event;
  if (blink::WebInputEvent::isTouchEventType(event.type)) {
    const blink::WebTouchEvent* orig_touch_event =
        static_cast<const blink::WebTouchEvent*>(&event);

    touch_event.reset(new blink::WebTouchEvent());
    memcpy(touch_event.get(), orig_touch_event, sizeof(blink::WebTouchEvent));

    // TODO(bokan): Blink passes back a WebGestureEvent with a touches,
    // changedTouches, and targetTouches lists; however, it doesn't set
    // the state field on the touches which is what the RenderWidget uses
    // to create a WebCore::TouchEvent. crbug.com/358132 tracks removing
    // these multiple lists from WebTouchEvent since they lead to misuse
    // like this and are functionally unused. In the mean time we'll setup
    // the state field here manually to fix multi-touch BrowserPlugins.
    for (size_t i = 0; i < touch_event->touchesLength; ++i) {
      blink::WebTouchPoint& touch = touch_event->touches[i];
      touch.state = blink::WebTouchPoint::StateStationary;
      for (size_t j = 0; j < touch_event->changedTouchesLength; ++j) {
        blink::WebTouchPoint& changed_touch = touch_event->changedTouches[j];
        if (touch.id == changed_touch.id) {
          touch.state = changed_touch.state;
          break;
        }
      }
    }

    // For End and Cancel, Blink gives BrowserPlugin a list of touches that
    // are down, but the browser process expects a list of all touches. We
    // modify these events here to match these expectations.
    if (event.type == blink::WebInputEvent::TouchEnd ||
        event.type == blink::WebInputEvent::TouchCancel) {
      if (touch_event->changedTouchesLength > 0) {
        memcpy(&touch_event->touches[touch_event->touchesLength],
               &touch_event->changedTouches,
              touch_event->changedTouchesLength * sizeof(blink::WebTouchPoint));
        touch_event->touchesLength += touch_event->changedTouchesLength;
      }
    }
    modified_event = touch_event.get();
  }

  if (blink::WebInputEvent::isKeyboardEventType(event.type) &&
      !edit_commands_.empty()) {
    browser_plugin_manager()->Send(
        new BrowserPluginHostMsg_SetEditCommandsForNextKeyEvent(
            render_view_routing_id_,
            guest_instance_id_,
            edit_commands_));
    edit_commands_.clear();
  }

  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_HandleInputEvent(render_view_routing_id_,
                                                guest_instance_id_,
                                                plugin_rect_,
                                                modified_event));
  GetWebKitCursorInfo(cursor_, &cursor_info);
  return true;
}

bool BrowserPlugin::handleDragStatusUpdate(blink::WebDragStatus drag_status,
                                           const blink::WebDragData& drag_data,
                                           blink::WebDragOperationsMask mask,
                                           const blink::WebPoint& position,
                                           const blink::WebPoint& screen) {
  if (guest_crashed_ || !HasGuestInstanceID())
    return false;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_DragStatusUpdate(
        render_view_routing_id_,
        guest_instance_id_,
        drag_status,
        DropDataBuilder::Build(drag_data),
        mask,
        position));
  return true;
}

void BrowserPlugin::didReceiveResponse(
    const blink::WebURLResponse& response) {
}

void BrowserPlugin::didReceiveData(const char* data, int data_length) {
  if (auto_navigate_) {
    std::string value(data, data_length);
    html_string_ += value;
  }
}

void BrowserPlugin::didFinishLoading() {
  if (auto_navigate_) {
    UpdateDOMAttribute(content::browser_plugin::kAttributeSrc, html_string_);
    ParseAttributes();
  }
}

void BrowserPlugin::didFailLoading(const blink::WebURLError& error) {
}

void BrowserPlugin::didFinishLoadingFrameRequest(const blink::WebURL& url,
                                                 void* notify_data) {
}

void BrowserPlugin::didFailLoadingFrameRequest(
    const blink::WebURL& url,
    void* notify_data,
    const blink::WebURLError& error) {
}

bool BrowserPlugin::executeEditCommand(const blink::WebString& name) {
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ExecuteEditCommand(
      render_view_routing_id_,
      guest_instance_id_,
      name.utf8()));

  // BrowserPlugin swallows edit commands.
  return true;
}

bool BrowserPlugin::executeEditCommand(const blink::WebString& name,
                                       const blink::WebString& value) {
  edit_commands_.push_back(EditCommand(name.utf8(), value.utf8()));
  // BrowserPlugin swallows edit commands.
  return true;
}

bool BrowserPlugin::setComposition(
    const blink::WebString& text,
    const blink::WebVector<blink::WebCompositionUnderline>& underlines,
    int selectionStart,
    int selectionEnd) {
  if (!HasGuestInstanceID())
    return false;
  std::vector<blink::WebCompositionUnderline> std_underlines;
  for (size_t i = 0; i < underlines.size(); ++i) {
    std_underlines.push_back(underlines[i]);
  }
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ImeSetComposition(
      render_view_routing_id_,
      guest_instance_id_,
      text.utf8(),
      std_underlines,
      selectionStart,
      selectionEnd));
  // TODO(kochi): This assumes the IPC handling always succeeds.
  return true;
}

bool BrowserPlugin::confirmComposition(
    const blink::WebString& text,
    blink::WebWidget::ConfirmCompositionBehavior selectionBehavior) {
  if (!HasGuestInstanceID())
    return false;
  bool keep_selection = (selectionBehavior == blink::WebWidget::KeepSelection);
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_ImeConfirmComposition(
      render_view_routing_id_,
      guest_instance_id_,
      text.utf8(),
      keep_selection));
  // TODO(kochi): This assumes the IPC handling always succeeds.
  return true;
}

void BrowserPlugin::extendSelectionAndDelete(int before, int after) {
  if (!HasGuestInstanceID())
    return;
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_ExtendSelectionAndDelete(
          render_view_routing_id_,
          guest_instance_id_,
          before,
          after));
}

void BrowserPlugin::OnLockMouseACK(bool succeeded) {
  mouse_locked_ = succeeded;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_LockMouse_ACK(
      render_view_routing_id_,
      guest_instance_id_,
      succeeded));
}

void BrowserPlugin::OnMouseLockLost() {
  mouse_locked_ = false;
  browser_plugin_manager()->Send(new BrowserPluginHostMsg_UnlockMouse_ACK(
      render_view_routing_id_,
      guest_instance_id_));
}

bool BrowserPlugin::HandleMouseLockedInputEvent(
    const blink::WebMouseEvent& event) {
  browser_plugin_manager()->Send(
      new BrowserPluginHostMsg_HandleInputEvent(render_view_routing_id_,
                                                guest_instance_id_,
                                                plugin_rect_,
                                                &event));
  return true;
}

}  // namespace content