/**
 * 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';

import type { BlockMap } from "./BlockMap";
import type DraftEditor from "./DraftEditor.react";
import type { EntityMap } from "./EntityMap";

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

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

const DataTransfer = require("fbjs/lib/DataTransfer");

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

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

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

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

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

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

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

const splitTextIntoTextBlocks = require("./splitTextIntoTextBlocks");
/**
 * Paste content.
 */


function editOnPaste(editor: DraftEditor, e: SyntheticClipboardEvent<>): void {
  e.preventDefault();
  const data = new DataTransfer(e.clipboardData); // Get files, unless this is likely to be a string the user wants inline.

  if (!data.isRichText()) {
    const files: Array<Blob> = (data.getFiles(): any);
    const defaultFileText = data.getText();

    if (files.length > 0) {
      // Allow customized paste handling for images, etc. Otherwise, fall
      // through to insert text contents into the editor.
      if (editor.props.handlePastedFiles && isEventHandled(editor.props.handlePastedFiles(files))) {
        return;
      }
      /* $FlowFixMe[incompatible-call] This comment suppresses an error found
       * DataTransfer was typed. getFiles() returns an array of <Files extends
       * Blob>, not Blob */


      getTextContentFromFiles(files,
      /*string*/
      fileText => {
        fileText = fileText || defaultFileText;

        if (!fileText) {
          return;
        }

        const editorState = editor._latestEditorState;
        const blocks = splitTextIntoTextBlocks(fileText);
        const character = CharacterMetadata.create({
          style: editorState.getCurrentInlineStyle(),
          entity: getEntityKeyForSelection(editorState.getCurrentContent(), editorState.getSelection())
        });
        const currentBlockType = RichTextEditorUtil.getCurrentBlockType(editorState);
        const text = DraftPasteProcessor.processText(blocks, character, currentBlockType);
        const fragment = BlockMapBuilder.createFromArray(text);
        const withInsertedText = DraftModifier.replaceWithFragment(editorState.getCurrentContent(), editorState.getSelection(), fragment);
        editor.update(EditorState.push(editorState, withInsertedText, 'insert-fragment'));
      });
      return;
    }
  }

  let textBlocks: Array<string> = [];
  let text: string = (data.getText(): any);
  let html: string = (data.getHTML(): any);
  const editorState = editor._latestEditorState;

  if (editor.props.formatPastedText) {
    const {
      text: formattedText,
      html: formattedHtml
    } = editor.props.formatPastedText(text, html);
    text = formattedText;
    html = ((formattedHtml: any): string);
  }

  if (editor.props.handlePastedText && isEventHandled(editor.props.handlePastedText(text, html, editorState))) {
    return;
  }

  if (text) {
    textBlocks = splitTextIntoTextBlocks(text);
  }

  if (!editor.props.stripPastedStyles) {
    // If the text from the paste event is rich content that matches what we
    // already have on the internal clipboard, assume that we should just use
    // the clipboard fragment for the paste. This will allow us to preserve
    // styling and entities, if any are present. Note that newlines are
    // stripped during comparison -- this is because copy/paste within the
    // editor in Firefox and IE will not include empty lines. The resulting
    // paste will preserve the newlines correctly.
    const internalClipboard = editor.getClipboard();

    if (!editor.props.formatPastedText && data.isRichText() && internalClipboard) {
      var _html;

      if ( // If the editorKey is present in the pasted HTML, it should be safe to
      // assume this is an internal paste.
      ((_html = html) === null || _html === void 0 ? void 0 : _html.indexOf(editor.getEditorKey())) !== -1 || // The copy may have been made within a single block, in which case the
      // editor key won't be part of the paste. In this case, just check
      // whether the pasted text matches the internal clipboard.
      textBlocks.length === 1 && internalClipboard.size === 1 && internalClipboard.first().getText() === text) {
        editor.update(insertFragment(editor._latestEditorState, internalClipboard));
        return;
      }
    } else if (internalClipboard && data.types.includes('com.apple.webarchive') && !data.types.includes('text/html') && areTextBlocksAndClipboardEqual(textBlocks, internalClipboard)) {
      // Safari does not properly store text/html in some cases.
      // Use the internalClipboard if present and equal to what is on
      // the clipboard. See https://bugs.webkit.org/show_bug.cgi?id=19893.
      editor.update(insertFragment(editor._latestEditorState, internalClipboard));
      return;
    } // If there is html paste data, try to parse that.


    if (html) {
      const htmlFragment = DraftPasteProcessor.processHTML(html, editor.props.blockRenderMap);

      if (htmlFragment) {
        const {
          contentBlocks,
          entityMap
        } = htmlFragment;

        if (contentBlocks) {
          const htmlMap = BlockMapBuilder.createFromArray(contentBlocks);
          editor.update(insertFragment(editor._latestEditorState, htmlMap, entityMap));
          return;
        }
      }
    } // Otherwise, create a new fragment from our pasted text. Also
    // empty the internal clipboard, since it's no longer valid.


    editor.setClipboard(null);
  }

  if (textBlocks.length) {
    const character = CharacterMetadata.create({
      style: editorState.getCurrentInlineStyle(),
      entity: getEntityKeyForSelection(editorState.getCurrentContent(), editorState.getSelection())
    });
    const currentBlockType = RichTextEditorUtil.getCurrentBlockType(editorState);
    const textFragment = DraftPasteProcessor.processText(textBlocks, character, currentBlockType);
    const textMap = BlockMapBuilder.createFromArray(textFragment);
    editor.update(insertFragment(editor._latestEditorState, textMap));
  }
}

function insertFragment(editorState: EditorState, fragment: BlockMap, entityMap: ?EntityMap): EditorState {
  const newContent = DraftModifier.replaceWithFragment(editorState.getCurrentContent(), editorState.getSelection(), fragment); // TODO: merge the entity map once we stop using DraftEntity
  // like this:
  // const mergedEntityMap = newContent.getEntityMap().merge(entityMap);

  return EditorState.push(editorState, newContent.set('entityMap', entityMap), 'insert-fragment');
}

function areTextBlocksAndClipboardEqual(textBlocks: Array<string>, blockMap: BlockMap): boolean {
  return textBlocks.length === blockMap.size && blockMap.valueSeq().every((block, ii) => block.getText() === textBlocks[ii]);
}

module.exports = editOnPaste;