/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict
 */

import type {
  LexicalEditor,
  LexicalNode,
  ElementNode,
  TextFormatType,
  TextNode,
} from 'lexical';

export type Transformer =
  | ElementTransformer
  | MultilineElementTransformer
  | TextFormatTransformer
  | TextMatchTransformer;

export type ElementTransformer = {
  dependencies: Array<Class<LexicalNode>>,
  export: (
    node: LexicalNode,
    traverseChildren: (node: ElementNode) => string,
  ) => string | null,
  regExp: RegExp,
  replace: (
    parentNode: ElementNode,
    children: Array<LexicalNode>,
    match: Array<string>,
    isImport: boolean,
  ) => boolean | void,
  type: 'element',
};

export type MultilineElementTransformer = {
  dependencies: Array<Class<LexicalNode>>;
  export?: (
    node: LexicalNode,
    traverseChildren: (node: ElementNode) => string,
  ) => string | null;
  handleImportAfterStartMatch?: (args: {
    lines: Array<string>;
    rootNode: ElementNode;
    startLineIndex: number;
    startMatch: RegExp$matchResult;
    transformer: MultilineElementTransformer;
  }) => [boolean, number] | null | void;
  regExpStart: RegExp;
  regExpEnd?:
    | RegExp
    | {
        optional?: true;
        regExp: RegExp;
      };
  replace: (
    rootNode: ElementNode,
    children: Array<LexicalNode> | null,
    startMatch: Array<string>,
    endMatch: Array<string> | null,
    linesInBetween: Array<string> | null,
    isImport: boolean,
  ) => boolean | void;
  type: 'multiline-element';
};

export type TextFormatTransformer = $ReadOnly<{
  format: $ReadOnlyArray<TextFormatType>,
  tag: string,
  intraword?: boolean,
  type: 'text-format',
}>;

export type TextMatchTransformer = $ReadOnly<{
  dependencies: Array<Class<LexicalNode>>,
  export?: (
    node: LexicalNode,
    exportChildren: (node: ElementNode) => string,
    exportFormat: (node: TextNode, textContent: string) => string,
  ) => string | null,
  getEndIndex?: (node: TextNode, match: RegExp$matchResult) => number | false;
  importRegExp?: RegExp,
  regExp: RegExp,
  replace?: (node: TextNode, match: RegExp$matchResult) => void | TextNode,
  trigger?: string,
  type: 'text-match',
}>;

declare export function registerMarkdownShortcuts(
  editor: LexicalEditor,
  transformers?: Array<Transformer>,
): () => void;

declare export function $convertFromMarkdownString(
  markdown: string,
  transformers?: Array<Transformer>,
  node?: ElementNode,
  shouldPreserveNewLines?: boolean,
  shouldMergeAdjacentLines?: boolean,
): void;

declare export function $convertToMarkdownString(
  transformers?: Array<Transformer>,
  node?: ElementNode,
  shouldPreserveNewLines?: boolean,
): string;

declare export var INLINE_CODE: TextFormatTransformer;
declare export var HIGHLIGHT: TextFormatTransformer;
declare export var BOLD_ITALIC_STAR: TextFormatTransformer;
declare export var BOLD_ITALIC_UNDERSCORE: TextFormatTransformer;
declare export var BOLD_STAR: TextFormatTransformer;
declare export var BOLD_UNDERSCORE: TextFormatTransformer;
declare export var STRIKETHROUGH: TextFormatTransformer;
declare export var ITALIC_STAR: TextFormatTransformer;
declare export var ITALIC_UNDERSCORE: TextFormatTransformer;

declare export var HEADING: ElementTransformer;
declare export var QUOTE: ElementTransformer;
declare export var CODE: MultilineElementTransformer;
declare export var UNORDERED_LIST: ElementTransformer;
declare export var CHECK_LIST: ElementTransformer;
declare export var ORDERED_LIST: ElementTransformer;

declare export var LINK: TextMatchTransformer;

declare export var TRANSFORMERS: Array<Transformer>;
declare export var ELEMENT_TRANSFORMERS: Array<ElementTransformer>;
declare export var MULTILINE_ELEMENT_TRANSFORMERS: Array<MultilineElementTransformer>;
declare export var TEXT_FORMAT_TRANSFORMERS: Array<TextFormatTransformer>;
declare export var TEXT_MATCH_TRANSFORMERS: Array<TextFormatTransformer>;