/**
 * Copyright (c) 2013-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @providesModule keyCommandDeleteWord
 * @format
 * @flow
 */

'use strict';

var DraftRemovableWord = require('./DraftRemovableWord');
var EditorState = require('./EditorState');

var moveSelectionForward = require('./moveSelectionForward');
var removeTextWithStrategy = require('./removeTextWithStrategy');

/**
 * Delete the word that is right of the cursor, as well as any spaces or
 * punctuation before the word.
 */
function keyCommandDeleteWord(editorState: EditorState): EditorState {
  var afterRemoval = removeTextWithStrategy(editorState, strategyState => {
    var selection = strategyState.getSelection();
    var offset = selection.getStartOffset();
    var key = selection.getStartKey();
    var content = strategyState.getCurrentContent();
    var text = content.getBlockForKey(key).getText().slice(offset);
    var toRemove = DraftRemovableWord.getForward(text);

    // If there are no words in front of the cursor, remove the newline.
    return moveSelectionForward(strategyState, toRemove.length || 1);
  }, 'forward');

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

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

module.exports = keyCommandDeleteWord;