/*
 * Copyright (C) 2006, 2007, 2009, 2011 Apple Inc. All rights reserved.
 * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
 * Copyright (C) 2012, Samsung Electronics. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "core/page/ChromeClient.h"

#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/frame/FrameConsole.h"
#include "core/frame/LocalFrame.h"
#include "core/inspector/ConsoleMessage.h"
#include "core/inspector/InspectorInstrumentation.h"
#include "core/layout/HitTestResult.h"
#include "core/page/FrameTree.h"
#include "core/page/ScopedPageSuspender.h"
#include "core/page/WindowFeatures.h"
#include "platform/geometry/IntRect.h"
#include "platform/network/NetworkHints.h"
#include "public/platform/WebScreenInfo.h"
#include <algorithm>

namespace blink {

DEFINE_TRACE(ChromeClient) {
  visitor->trace(m_lastMouseOverNode);
  HostWindow::trace(visitor);
}

void ChromeClient::setWindowRectWithAdjustment(const IntRect& pendingRect,
                                               LocalFrame& frame) {
  IntRect screen = screenInfo().availableRect;
  IntRect window = pendingRect;

  IntSize minimumSize = minimumWindowSize();
  // Let size 0 pass through, since that indicates default size, not minimum
  // size.
  if (window.width())
    window.setWidth(std::min(std::max(minimumSize.width(), window.width()),
                             screen.width()));
  if (window.height())
    window.setHeight(std::min(std::max(minimumSize.height(), window.height()),
                              screen.height()));

  // Constrain the window position within the valid screen area.
  window.setX(std::max(screen.x(),
                       std::min(window.x(), screen.maxX() - window.width())));
  window.setY(std::max(screen.y(),
                       std::min(window.y(), screen.maxY() - window.height())));
  setWindowRect(window, frame);
}

bool ChromeClient::canOpenModalIfDuringPageDismissal(
    Frame* mainFrame,
    ChromeClient::DialogType dialog,
    const String& message) {
  for (Frame* frame = mainFrame; frame; frame = frame->tree().traverseNext()) {
    if (!frame->isLocalFrame())
      continue;
    LocalFrame& localFrame = toLocalFrame(*frame);
    Document::PageDismissalType dismissal =
        localFrame.document()->pageDismissalEventBeingDispatched();
    if (dismissal != Document::NoDismissal) {
      return shouldOpenModalDialogDuringPageDismissal(localFrame, dialog,
                                                      message, dismissal);
    }
  }
  return true;
}

void ChromeClient::setWindowFeatures(const WindowFeatures& features) {
  setToolbarsVisible(features.toolBarVisible || features.locationBarVisible);
  setStatusbarVisible(features.statusBarVisible);
  setScrollbarsVisible(features.scrollbarsVisible);
  setMenubarVisible(features.menuBarVisible);
  setResizable(features.resizable);
}

template <typename Delegate>
static bool openJavaScriptDialog(LocalFrame* frame,
                                 const String& message,
                                 ChromeClient::DialogType dialogType,
                                 const Delegate& delegate) {
  // Suspend pages in case the client method runs a new event loop that would
  // otherwise cause the load to continue while we're in the middle of
  // executing JavaScript.
  ScopedPageSuspender suspender;
  InspectorInstrumentation::willRunJavaScriptDialog(frame, message, dialogType);
  bool result = delegate();
  InspectorInstrumentation::didRunJavaScriptDialog(frame, result);
  return result;
}

bool ChromeClient::openBeforeUnloadConfirmPanel(const String& message,
                                                LocalFrame* frame,
                                                bool isReload) {
  ASSERT(frame);
  return openJavaScriptDialog(
      frame, message, ChromeClient::HTMLDialog, [this, frame, isReload]() {
        return openBeforeUnloadConfirmPanelDelegate(frame, isReload);
      });
}

bool ChromeClient::openJavaScriptAlert(LocalFrame* frame,
                                       const String& message) {
  ASSERT(frame);
  if (!canOpenModalIfDuringPageDismissal(frame->tree().top(),
                                         ChromeClient::AlertDialog, message))
    return false;
  return openJavaScriptDialog(
      frame, message, ChromeClient::AlertDialog, [this, frame, &message]() {
        return openJavaScriptAlertDelegate(frame, message);
      });
}

bool ChromeClient::openJavaScriptConfirm(LocalFrame* frame,
                                         const String& message) {
  ASSERT(frame);
  if (!canOpenModalIfDuringPageDismissal(frame->tree().top(),
                                         ChromeClient::ConfirmDialog, message))
    return false;
  return openJavaScriptDialog(
      frame, message, ChromeClient::ConfirmDialog, [this, frame, &message]() {
        return openJavaScriptConfirmDelegate(frame, message);
      });
}

bool ChromeClient::openJavaScriptPrompt(LocalFrame* frame,
                                        const String& prompt,
                                        const String& defaultValue,
                                        String& result) {
  ASSERT(frame);
  if (!canOpenModalIfDuringPageDismissal(frame->tree().top(),
                                         ChromeClient::PromptDialog, prompt))
    return false;
  return openJavaScriptDialog(frame, prompt, ChromeClient::PromptDialog,
                              [this, frame, &prompt, &defaultValue, &result]() {
                                return openJavaScriptPromptDelegate(
                                    frame, prompt, defaultValue, result);
                              });
}

void ChromeClient::mouseDidMoveOverElement(LocalFrame& frame,
                                           const HitTestResult& result) {
  if (!result.scrollbar() && result.innerNode() &&
      result.innerNode()->document().isDNSPrefetchEnabled())
    prefetchDNS(result.absoluteLinkURL().host());

  showMouseOverURL(result);

  if (result.scrollbar())
    clearToolTip(frame);
  else
    setToolTip(frame, result);
}

void ChromeClient::setToolTip(LocalFrame& frame, const HitTestResult& result) {
  // First priority is a tooltip for element with "title" attribute.
  TextDirection toolTipDirection;
  String toolTip = result.title(toolTipDirection);

  // Lastly, some elements provide default tooltip strings.  e.g. <input
  // type="file" multiple> shows a tooltip for the selected filenames.
  if (toolTip.isEmpty()) {
    if (Node* node = result.innerNode()) {
      if (node->isElementNode()) {
        toolTip = toElement(node)->defaultToolTip();

        // FIXME: We should obtain text direction of tooltip from
        // ChromeClient or platform. As of October 2011, all client
        // implementations don't use text direction information for
        // ChromeClient::setToolTip. We'll work on tooltip text
        // direction during bidi cleanup in form inputs.
        toolTipDirection = TextDirection::kLtr;
      }
    }
  }

  if (m_lastToolTipPoint == result.hitTestLocation().point() &&
      m_lastToolTipText == toolTip)
    return;

  // If a tooltip was displayed earlier, and mouse cursor moves over
  // a different node with the same tooltip text, make sure the previous
  // tooltip is unset, so that it does not get stuck positioned relative
  // to the previous node).
  // The ::setToolTip overload, which is be called down the road,
  // ensures a new tooltip to be displayed with the new context.
  if (result.innerNodeOrImageMapImage() != m_lastMouseOverNode &&
      !m_lastToolTipText.isEmpty() && toolTip == m_lastToolTipText)
    clearToolTip(frame);

  m_lastToolTipPoint = result.hitTestLocation().point();
  m_lastToolTipText = toolTip;
  m_lastMouseOverNode = result.innerNodeOrImageMapImage();
  setToolTip(frame, toolTip, toolTipDirection);
}

void ChromeClient::clearToolTip(LocalFrame& frame) {
  // Do not check m_lastToolTip* and do not update them intentionally.
  // We don't want to show tooltips with same content after clearToolTip().
  setToolTip(frame, String(), TextDirection::kLtr);
}

bool ChromeClient::print(LocalFrame* frame) {
  if (frame->document()->isSandboxed(SandboxModals)) {
    UseCounter::count(frame, UseCounter::DialogInSandboxedContext);
    frame->console().addMessage(ConsoleMessage::create(
        SecurityMessageSource, ErrorMessageLevel,
        "Ignored call to 'print()'. The document is sandboxed, and the "
        "'allow-modals' keyword is not set."));
    return false;
  }

  // Suspend pages in case the client method runs a new event loop that would
  // otherwise cause the load to continue while we're in the middle of
  // executing JavaScript.
  ScopedPageSuspender suspender;

  printDelegate(frame);
  return true;
}

}  // namespace blink