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

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

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

var UserAgent = require("fbjs/lib/UserAgent");

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

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

var isSelectionAtLeafStart = require("./isSelectionAtLeafStart");

var nullthrows = require("fbjs/lib/nullthrows");

var setImmediate = require("fbjs/lib/setImmediate"); // When nothing is focused, Firefox regards two characters, `'` and `/`, as
// commands that should open and focus the "quickfind" search bar. This should
// *never* happen while a contenteditable is focused, but as of v28, it
// sometimes does, even when the keypress event target is the contenteditable.
// This breaks the input. Special case these characters to ensure that when
// they are typed, we prevent default on the event to make sure not to
// trigger quickfind.

var FF_QUICKFIND_CHAR = "'";
var FF_QUICKFIND_LINK_CHAR = '/';
var isFirefox = UserAgent.isBrowser('Firefox');

function mustPreventDefaultForCharacter(character) {
  return isFirefox && (character == FF_QUICKFIND_CHAR || character == FF_QUICKFIND_LINK_CHAR);
}
/**
 * Replace the current selection with the specified text string, with the
 * inline style and entity key applied to the newly inserted text.
 */

function replaceText(editorState, text, inlineStyle, entityKey, forceSelection) {
  var contentState = DraftModifier.replaceText(editorState.getCurrentContent(), editorState.getSelection(), text, inlineStyle, entityKey);
  return EditorState.push(editorState, contentState, 'insert-characters', forceSelection);
}
/**
 * When `onBeforeInput` executes, the browser is attempting to insert a
 * character into the editor. Apply this character data to the document,
 * allowing native insertion if possible.
 *
 * Native insertion is encouraged in order to limit re-rendering and to
 * preserve spellcheck highlighting, which disappears or flashes if re-render
 * occurs on the relevant text nodes.
 */

function editOnBeforeInput(editor, e) {
  if (editor._pendingStateFromBeforeInput !== undefined) {
    editor.update(editor._pendingStateFromBeforeInput);
    editor._pendingStateFromBeforeInput = undefined;
  }

var editorState = editor._latestEditorState;
  var chars = e.data; // In some cases (ex: IE ideographic space insertion) no character data
  // is provided. There's nothing to do when this happens.

if (!chars) {
    return;
  } // Allow the top-level component to handle the insertion manually. This is
  // useful when triggering interesting behaviors for a character insertion,
  // Simple examples: replacing a raw text ':)' with a smile emoji or image
  // decorator, or setting a block to be a list item after typing '- ' at the
  // start of the block.

if (editor.props.handleBeforeInput && isEventHandled(editor.props.handleBeforeInput(chars, editorState, e.timeStamp))) {
    e.preventDefault();
    return;
  } // If selection is collapsed, conditionally allow native behavior. This
  // reduces re-renders and preserves spellcheck highlighting. If the selection
  // is not collapsed, we will re-render.

var selection = editorState.getSelection();
  var selectionStart = selection.getStartOffset();
  var anchorKey = selection.getAnchorKey();

if (!selection.isCollapsed()) {
    e.preventDefault();
    editor.update(replaceText(editorState, chars, editorState.getCurrentInlineStyle(), getEntityKeyForSelection(editorState.getCurrentContent(), editorState.getSelection()), true));
    return;
  }

var newEditorState = replaceText(editorState, chars, editorState.getCurrentInlineStyle(), getEntityKeyForSelection(editorState.getCurrentContent(), editorState.getSelection()), false); // Bunch of different cases follow where we need to prevent native insertion.

var mustPreventNative = false;

if (!mustPreventNative) {
    // Browsers tend to insert text in weird places in the DOM when typing at
    // the start of a leaf, so we'll handle it ourselves.
    mustPreventNative = isSelectionAtLeafStart(editor._latestCommittedEditorState);
  }

if (!mustPreventNative) {
    // Let's say we have a decorator that highlights hashtags. In many cases
    // we need to prevent native behavior and rerender ourselves --
    // particularly, any case *except* where the inserted characters end up
    // anywhere except exactly where you put them.
    //
    // Using [] to denote a decorated leaf, some examples:
    //
    // 1. 'hi #' and append 'f'
    // desired rendering: 'hi [#f]'
    // native rendering would be: 'hi #f' (incorrect)
    //
    // 2. 'x [#foo]' and insert '#' before 'f'
    // desired rendering: 'x #[#foo]'
    // native rendering would be: 'x [##foo]' (incorrect)
    //
    // 3. '[#foobar]' and insert ' ' between 'foo' and 'bar'
    // desired rendering: '[#foo] bar'
    // native rendering would be: '[#foo bar]' (incorrect)
    //
    // 4. '[#foo]' and delete '#' [won't use this beforeinput codepath though]
    // desired rendering: 'foo'
    // native rendering would be: '[foo]' (incorrect)
    //
    // 5. '[#foo]' and append 'b'
    // desired rendering: '[#foob]'
    // native rendering would be: '[#foob]'
    // (native insertion here would be ok for decorators like simple spans,
    // but not more complex decorators. To be safe, we need to prevent it.)
    //
    // It is safe to allow native insertion if and only if the full list of
    // decorator ranges matches what we expect native insertion to give, and
    // the range lengths have not changed. We don't need to compare the content
    // because the only possible mutation to consider here is inserting plain
    // text and decorators can't affect text content.
    var oldBlockTree = editorState.getBlockTree(anchorKey);
    var newBlockTree = newEditorState.getBlockTree(anchorKey);
    mustPreventNative = oldBlockTree.size !== newBlockTree.size || oldBlockTree.zip(newBlockTree).some(function (_ref) {
      var oldLeafSet = _ref[0],
          newLeafSet = _ref[1];
      // selectionStart is guaranteed to be selectionEnd here
      var oldStart = oldLeafSet.get('start');
      var adjustedStart = oldStart + (oldStart >= selectionStart ? chars.length : 0);
      var oldEnd = oldLeafSet.get('end');
      var adjustedEnd = oldEnd + (oldEnd >= selectionStart ? chars.length : 0);
      var newStart = newLeafSet.get('start');
      var newEnd = newLeafSet.get('end');
      var newDecoratorKey = newLeafSet.get('decoratorKey');
      return (// Different decorators
        oldLeafSet.get('decoratorKey') !== newDecoratorKey || // Different number of inline styles
        oldLeafSet.get('leaves').size !== newLeafSet.get('leaves').size || // Different effective decorator position
        adjustedStart !== newStart || adjustedEnd !== newEnd || // Decorator already existed and its length changed
        newDecoratorKey != null && newEnd - newStart !== oldEnd - oldStart
      );
    });
  }

if (!mustPreventNative) {
    mustPreventNative = mustPreventDefaultForCharacter(chars);
  }

if (!mustPreventNative) {
    mustPreventNative = nullthrows(newEditorState.getDirectionMap()).get(anchorKey) !== nullthrows(editorState.getDirectionMap()).get(anchorKey);
  }

if (mustPreventNative) {
    e.preventDefault();
    newEditorState = EditorState.set(newEditorState, {
      forceSelection: true
    });
    editor.update(newEditorState);
    return;
  } // We made it all the way! Let the browser do its thing and insert the char.

newEditorState = EditorState.set(newEditorState, {
    nativelyRenderedContent: newEditorState.getCurrentContent()
  }); // The native event is allowed to occur. To allow user onChange handlers to
  // change the inserted text, we wait until the text is actually inserted
  // before we actually update our state. That way when we rerender, the text
  // we see in the DOM will already have been inserted properly.

editor._pendingStateFromBeforeInput = newEditorState;
  setImmediate(function () {
    if (editor._pendingStateFromBeforeInput !== undefined) {
      editor.update(editor._pendingStateFromBeforeInput);
      editor._pendingStateFromBeforeInput = undefined;
    }
  });
}

module.exports = editOnBeforeInput;