/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * @flow strict-local
 * @emails oncall+draft_js
 */
'use strict';

const DraftRemovableWord = require("./DraftRemovableWord");

const EditorState = require("./EditorState");

const moveSelectionBackward = require("./moveSelectionBackward");

const removeTextWithStrategy = require("./removeTextWithStrategy");
/**
 * Delete the word that is left of the cursor, as well as any spaces or
 * punctuation after the word.
 */


function keyCommandBackspaceWord(editorState: EditorState): EditorState {
  const afterRemoval = removeTextWithStrategy(editorState, strategyState => {
    const selection = strategyState.getSelection();
    const offset = selection.getStartOffset(); // If there are no words before the cursor, remove the preceding newline.

    if (offset === 0) {
      return moveSelectionBackward(strategyState, 1);
    }

    const key = selection.getStartKey();
    const content = strategyState.getCurrentContent();
    const text = content.getBlockForKey(key).getText().slice(0, offset);
    const toRemove = DraftRemovableWord.getBackward(text);
    return moveSelectionBackward(strategyState, toRemove.length || 1);
  }, 'backward');

  if (afterRemoval === editorState.getCurrentContent()) {
    return editorState;
  }

  return EditorState.push(editorState, afterRemoval, 'remove-range');
}

module.exports = keyCommandBackspaceWord;