/**
 * 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
 * @emails oncall+draft_js
 */
'use strict';

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

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

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

const Immutable = require("immutable");

const getSampleSelectionMocksForTestingNestedBlocks = (): Object => {
  const root = document.createElement('div');
  const contents = document.createElement('div');
  contents.setAttribute('data-contents', 'true');
  root.appendChild(contents);
  const text = [null, 'beta', null, 'delta'];
  const offsetKeys = ['a-0-0', 'b-0-0', 'c-0-0', 'd-0-0'];
  const contentBlocks = [new ContentBlockNode({
    key: 'a',
    nextSibling: 'c',
    children: Immutable.List.of('b')
  }), new ContentBlockNode({
    key: 'b',
    parent: 'a',
    text: text[1]
  }), new ContentBlockNode({
    key: 'c',
    prevSibling: 'a',
    children: Immutable.List.of('d')
  }), new ContentBlockNode({
    key: 'd',
    parent: 'c',
    text: text[3]
  })];
  const contentState = ContentState.createFromBlockArray(contentBlocks);
  const editorState = EditorState.createWithContent(contentState);
  const textNodes = text.map(text => {
    if (!text) {
      return null;
    }

    return document.createTextNode(text);
  });
  const leafChildren = textNodes.map(textNode => {
    if (!textNode) {
      return null;
    }

    const span = document.createElement('span');
    span.appendChild(textNode);
    return span;
  });
  const leafs = leafChildren.map((leafChild, index) => {
    if (!leafChild) {
      return null;
    }

    const blockKey = offsetKeys[index];
    const span = document.createElement('span');
    span.setAttribute('data-offset-key', blockKey);
    span.appendChild(leafChild);
    return span;
  });
  const decorators = leafs.map((leaf, index) => {
    if (!leaf) {
      return null;
    }

    const blockKey = offsetKeys[index];
    const span = document.createElement('span');
    span.setAttribute('data-offset-key', blockKey);
    span.appendChild(leaf);
    return span;
  });
  const blocks = offsetKeys.map((blockKey, index) => {
    const outerBlockElement = document.createElement('div');
    const innerBlockElement = document.createElement('div');
    innerBlockElement.setAttribute('data-offset-key', blockKey);
    outerBlockElement.setAttribute('data-offset-key', blockKey);
    outerBlockElement.setAttribute('data-block', 'true');
    const decorator = decorators[index]; // only leaf nodes can have text

    if (decorator) {
      innerBlockElement.appendChild(decorator);
    }

    outerBlockElement.appendChild(innerBlockElement);
    return outerBlockElement;
  });
  const blockCacheRef = {};
  blocks.forEach((blockElem, index) => {
    const currentBlock = contentBlocks[index];
    const parentKey = currentBlock.getParentKey(); // add this block reference to the cache lookup ref

    blockCacheRef[currentBlock.getKey()] = blockElem; // root nodes get appended directly to the contents block

    if (!parentKey) {
      contents.appendChild(blockElem);
      return;
    } // append to to the innerBlockElement of the parent block


    blockCacheRef[parentKey].firstChild.appendChild(blockElem);
  });
  return {
    editorState,
    root,
    contents,
    blocks,
    decorators,
    leafs,
    leafChildren,
    textNodes
  };
};

module.exports = getSampleSelectionMocksForTestingNestedBlocks;