/**
 * 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';

import type { BlockNodeRecord } from "./BlockNodeRecord";
import type ContentState from "./ContentState";
import type SelectionState from "./SelectionState";

const Immutable = require("immutable");

const {
  Map
} = Immutable;

function modifyBlockForContentState(contentState: ContentState, selectionState: SelectionState, operation: (block: BlockNodeRecord) => BlockNodeRecord): ContentState {
  const startKey = selectionState.getStartKey();
  const endKey = selectionState.getEndKey();
  const blockMap = contentState.getBlockMap();
  const newBlocks = blockMap.toSeq().skipUntil((_, k) => k === startKey).takeUntil((_, k) => k === endKey).concat(Map([[endKey, blockMap.get(endKey)]])).map(operation);
  return contentState.merge({
    blockMap: blockMap.merge(newBlocks),
    selectionBefore: selectionState,
    selectionAfter: selectionState
  });
}

module.exports = modifyBlockForContentState;