/*
 * Copyright (C) 2005, 2006 Apple Computer, 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "core/editing/commands/MoveSelectionCommand.h"

#include "core/dom/DocumentFragment.h"
#include "core/editing/commands/ReplaceSelectionCommand.h"

namespace blink {

MoveSelectionCommand::MoveSelectionCommand(DocumentFragment* fragment,
                                           const Position& position,
                                           bool smartInsert,
                                           bool smartDelete)
    : CompositeEditCommand(*position.document()),
      m_fragment(fragment),
      m_position(position),
      m_smartInsert(smartInsert),
      m_smartDelete(smartDelete) {
  DCHECK(m_fragment);
}

void MoveSelectionCommand::doApply(EditingState* editingState) {
  DCHECK(endingSelection().isNonOrphanedRange());

  Position pos = m_position;
  if (pos.isNull())
    return;

  // Update the position otherwise it may become invalid after the selection is
  // deleted.
  Position selectionEnd = endingSelection().end();
  if (pos.isOffsetInAnchor() && selectionEnd.isOffsetInAnchor() &&
      selectionEnd.computeContainerNode() == pos.computeContainerNode() &&
      selectionEnd.offsetInContainerNode() < pos.offsetInContainerNode()) {
    pos = Position(
        pos.computeContainerNode(),
        pos.offsetInContainerNode() - selectionEnd.offsetInContainerNode());

    Position selectionStart = endingSelection().start();
    if (selectionStart.isOffsetInAnchor() &&
        selectionStart.computeContainerNode() == pos.computeContainerNode())
      pos = Position(
          pos.computeContainerNode(),
          pos.offsetInContainerNode() + selectionStart.offsetInContainerNode());
  }

  deleteSelection(editingState, m_smartDelete);
  if (editingState->isAborted())
    return;

  // If the node for the destination has been removed as a result of the
  // deletion, set the destination to the ending point after the deletion.
  // Fixes: <rdar://problem/3910425> REGRESSION (Mail): Crash in
  // ReplaceSelectionCommand; selection is empty, leading to null deref
  if (!pos.isConnected())
    pos = endingSelection().start();

  cleanupAfterDeletion(editingState, createVisiblePositionDeprecated(pos));
  if (editingState->isAborted())
    return;

  setEndingSelection(createVisibleSelectionDeprecated(
      pos, endingSelection().affinity(), endingSelection().isDirectional()));
  if (!pos.isConnected()) {
    // Document was modified out from under us.
    return;
  }
  ReplaceSelectionCommand::CommandOptions options =
      ReplaceSelectionCommand::SelectReplacement |
      ReplaceSelectionCommand::PreventNesting;
  if (m_smartInsert)
    options |= ReplaceSelectionCommand::SmartReplace;
  applyCommandToComposite(
      ReplaceSelectionCommand::create(document(), m_fragment, options),
      editingState);
}

InputEvent::InputType MoveSelectionCommand::inputType() const {
  return InputEvent::InputType::None;
}

DEFINE_TRACE(MoveSelectionCommand) {
  visitor->trace(m_fragment);
  visitor->trace(m_position);
  CompositeEditCommand::trace(visitor);
}

}  // namespace blink