/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_a11y_HyperTextAccessible_inl_h__
#define mozilla_a11y_HyperTextAccessible_inl_h__

#include "HyperTextAccessible.h"

#include "nsAccUtils.h"

#include "nsIClipboard.h"
#include "nsFrameSelection.h"

#include "mozilla/EditorBase.h"

namespace mozilla {
namespace a11y {

inline void HyperTextAccessible::SetCaretOffset(int32_t aOffset) {
  SetSelectionRange(aOffset, aOffset);
  // XXX: Force cache refresh until a good solution for AT emulation of user
  // input is implemented (AccessFu caret movement).
  SelectionMgr()->UpdateCaretOffset(this, aOffset);
}

inline bool HyperTextAccessible::AddToSelection(int32_t aStartOffset,
                                                int32_t aEndOffset) {
  dom::Selection* domSel = DOMSelection();
  return domSel &&
         SetSelectionBoundsAt(domSel->RangeCount(), aStartOffset, aEndOffset);
}

inline void HyperTextAccessible::ReplaceText(const nsAString& aText) {
  if (aText.Length() == 0) {
    DeleteText(0, CharacterCount());
    return;
  }

  SetSelectionRange(0, CharacterCount());

  RefPtr<EditorBase> editorBase = GetEditor();
  if (!editorBase) {
    return;
  }

  DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the new text");
}

inline void HyperTextAccessible::InsertText(const nsAString& aText,
                                            int32_t aPosition) {
  RefPtr<EditorBase> editorBase = GetEditor();
  if (editorBase) {
    SetSelectionRange(aPosition, aPosition);
    DebugOnly<nsresult> rv = editorBase->InsertTextAsAction(aText);
    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to insert the text");
  }
}

inline void HyperTextAccessible::CopyText(int32_t aStartPos, int32_t aEndPos) {
  RefPtr<EditorBase> editorBase = GetEditor();
  if (editorBase) {
    SetSelectionRange(aStartPos, aEndPos);
    editorBase->Copy();
  }
}

inline void HyperTextAccessible::CutText(int32_t aStartPos, int32_t aEndPos) {
  RefPtr<EditorBase> editorBase = GetEditor();
  if (editorBase) {
    SetSelectionRange(aStartPos, aEndPos);
    editorBase->Cut();
  }
}

inline void HyperTextAccessible::DeleteText(int32_t aStartPos,
                                            int32_t aEndPos) {
  RefPtr<EditorBase> editorBase = GetEditor();
  if (!editorBase) {
    return;
  }
  SetSelectionRange(aStartPos, aEndPos);
  DebugOnly<nsresult> rv =
      editorBase->DeleteSelectionAsAction(nsIEditor::eNone, nsIEditor::eStrip);
  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Failed to delete text");
}

inline void HyperTextAccessible::PasteText(int32_t aPosition) {
  RefPtr<EditorBase> editorBase = GetEditor();
  if (editorBase) {
    SetSelectionRange(aPosition, aPosition);
    editorBase->PasteAsAction(nsIClipboard::kGlobalClipboard, true);
  }
}

inline uint32_t HyperTextAccessible::AdjustCaretOffset(uint32_t aOffset) const {
  // It is the same character offset when the caret is visually at the very
  // end of a line or the start of a new line (soft line break). Getting text
  // at the line should provide the line with the visual caret, otherwise
  // screen readers will announce the wrong line as the user presses up or
  // down arrow and land at the end of a line.
  if (aOffset > 0 && IsCaretAtEndOfLine()) return aOffset - 1;

  return aOffset;
}

inline bool HyperTextAccessible::IsCaretAtEndOfLine() const {
  RefPtr<nsFrameSelection> frameSelection = FrameSelection();
  return frameSelection && frameSelection->GetHint() == CARET_ASSOCIATE_BEFORE;
}

inline already_AddRefed<nsFrameSelection> HyperTextAccessible::FrameSelection()
    const {
  nsIFrame* frame = GetFrame();
  return frame ? frame->GetFrameSelection() : nullptr;
}

inline dom::Selection* HyperTextAccessible::DOMSelection() const {
  RefPtr<nsFrameSelection> frameSelection = FrameSelection();
  return frameSelection ? frameSelection->GetSelection(SelectionType::eNormal)
                        : nullptr;
}

}  // namespace a11y
}  // namespace mozilla

#endif