/*
 * Copyright (C) 2012 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:
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "public/web/WebSurroundingText.h"

#include "core/dom/Element.h"
#include "core/dom/Node.h"
#include "core/dom/Range.h"
#include "core/dom/Text.h"
#include "core/editing/FrameSelection.h"
#include "core/editing/SurroundingText.h"
#include "core/editing/VisiblePosition.h"
#include "core/layout/LayoutObject.h"
#include "public/platform/WebPoint.h"
#include "public/web/WebHitTestResult.h"
#include "web/WebLocalFrameImpl.h"

namespace blink {

WebSurroundingText::WebSurroundingText() {}

WebSurroundingText::~WebSurroundingText() {}

void WebSurroundingText::initialize(const WebNode& webNode,
                                    const WebPoint& nodePoint,
                                    size_t maxLength) {
  const Node* node = webNode.constUnwrap<Node>();
  if (!node)
    return;

  // VisiblePosition and SurroundingText must be created with clean layout.
  node->document().updateStyleAndLayoutIgnorePendingStylesheets();
  DocumentLifecycle::DisallowTransitionScope disallowTransition(
      node->document().lifecycle());

  if (!node->layoutObject())
    return;

  // TODO(xiaochengh): The followinng SurroundingText can hold a null Range,
  // in which case we should prevent it from being stored in |m_private|.
  m_private.reset(new SurroundingText(
      createVisiblePosition(node->layoutObject()->positionForPoint(
                                static_cast<IntPoint>(nodePoint)))
          .deepEquivalent()
          .parentAnchoredEquivalent(),
      maxLength));
}

void WebSurroundingText::initializeFromCurrentSelection(WebLocalFrame* frame,
                                                        size_t maxLength) {
  LocalFrame* webFrame = toWebLocalFrameImpl(frame)->frame();

  // TODO(xiaochengh): The use of updateStyleAndLayoutIgnorePendingStylesheets
  // needs to be audited.  See http://crbug.com/590369 for more details.
  webFrame->document()->updateStyleAndLayoutIgnorePendingStylesheets();

  if (Range* range = createRange(
          webFrame->selection().selection().toNormalizedEphemeralRange())) {
    // TODO(xiaochengh): The followinng SurroundingText can hold a null Range,
    // in which case we should prevent it from being stored in |m_private|.
    m_private.reset(new SurroundingText(*range, maxLength));
  }
}

WebString WebSurroundingText::textContent() const {
  return m_private->content();
}

size_t WebSurroundingText::hitOffsetInTextContent() const {
  DCHECK_EQ(m_private->startOffsetInContent(), m_private->endOffsetInContent());
  return m_private->startOffsetInContent();
}

size_t WebSurroundingText::startOffsetInTextContent() const {
  return m_private->startOffsetInContent();
}

size_t WebSurroundingText::endOffsetInTextContent() const {
  return m_private->endOffsetInContent();
}

bool WebSurroundingText::isNull() const {
  return !m_private.get();
}

}  // namespace blink