/*
 * Copyright (C) 2005, 2006, 2008 Apple 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_DELETE_SELECTION_COMMAND_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_DELETE_SELECTION_COMMAND_H_

#include "third_party/blink/renderer/core/editing/commands/composite_edit_command.h"
#include "third_party/blink/renderer/core/editing/commands/delete_selection_options.h"
#include "third_party/blink/renderer/core/editing/visible_selection.h"

namespace blink {

class EditingStyle;
class HTMLTableRowElement;

class CORE_EXPORT DeleteSelectionCommand final : public CompositeEditCommand {
 public:
  DeleteSelectionCommand(
      Document&,
      const DeleteSelectionOptions&,
      InputEvent::InputType input_type = InputEvent::InputType::kNone,
      const Position& reference_move_position = Position());
  DeleteSelectionCommand(
      const SelectionForUndoStep&,
      const DeleteSelectionOptions&,
      InputEvent::InputType input_type = InputEvent::InputType::kNone);

  void Trace(Visitor*) const override;

 private:
  void DoApply(EditingState*) override;
  InputEvent::InputType GetInputType() const override;

  bool PreservesTypingStyle() const override;

  void InitializeStartEnd(Position&, Position&);
  void SetStartingSelectionOnSmartDelete(const Position&, const Position&);
  void InitializePositionData(EditingState*);
  void SaveTypingStyleState();
  bool HandleSpecialCaseBRDelete(EditingState*);
  void HandleGeneralDelete(EditingState*);
  void FixupWhitespace();
  void MergeParagraphs(EditingState*);
  void RemovePreviouslySelectedEmptyTableRows(EditingState*);
  void CalculateTypingStyleAfterDelete();
  void ClearTransientState();
  void MakeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss(
      EditingState*);
  void RemoveNode(Node*,
                  EditingState*,
                  ShouldAssumeContentIsAlwaysEditable =
                      kDoNotAssumeContentIsAlwaysEditable) override;
  void DeleteTextFromNode(Text*, unsigned, unsigned) override;
  void RemoveRedundantBlocks(EditingState*);

  const DeleteSelectionOptions options_;
  const bool has_selection_to_delete_;
  bool merge_blocks_after_delete_;
  bool need_placeholder_ = false;
  bool prune_start_block_if_necessary_ = false;
  bool starts_at_empty_line_ = false;
  const InputEvent::InputType input_type_;

  // This data is transient and should be cleared at the end of the doApply
  // function.
  SelectionForUndoStep selection_to_delete_;
  Position upstream_start_;
  Position downstream_start_;
  Position upstream_end_;
  Position downstream_end_;
  Position ending_position_;
  Position leading_whitespace_;
  Position trailing_whitespace_;
  Position reference_move_position_;
  Member<Node> start_block_;
  Member<Node> end_block_;
  Member<EditingStyle> typing_style_;
  Member<EditingStyle> delete_into_blockquote_style_;
  Member<Element> start_root_;
  Member<Element> end_root_;
  Member<HTMLTableRowElement> start_table_row_;
  Member<HTMLTableRowElement> end_table_row_;
  Member<Node> temporary_placeholder_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_COMMANDS_DELETE_SELECTION_COMMAND_H_