import React, { useRef, forwardRef, useImperativeHandle } from 'react';
import { EditorState, EditorStateConfig, Extension, StateField } from '@codemirror/state';
import { EditorView, ViewUpdate } from '@codemirror/view';
import { BasicSetupOptions } from '@uiw/codemirror-extensions-basic-setup';
import { useCodeMirror } from './useCodeMirror';
import { Statistics } from './utils';

export * from '@uiw/codemirror-extensions-basic-setup';
export * from './useCodeMirror';
export * from './getDefaultExtensions';
export * from './utils';

export interface ReactCodeMirrorProps
  extends Omit<EditorStateConfig, 'doc' | 'extensions'>,
    Omit<React.HTMLAttributes<HTMLDivElement>, 'onChange' | 'placeholder'> {
  /** value of the auto created model in the editor. */
  value?: string;
  height?: string;
  minHeight?: string;
  maxHeight?: string;
  width?: string;
  minWidth?: string;
  maxWidth?: string;
  /** focus on the editor. */
  autoFocus?: boolean;
  /** Enables a placeholder—a piece of example content to show when the editor is empty. */
  placeholder?: string | HTMLElement;
  /**
   * `light` / `dark` / `Extension` Defaults to `light`.
   * @default light
   */
  theme?: 'light' | 'dark' | 'none' | Extension;
  /**
   * Whether to optional basicSetup by default
   * @default true
   */
  basicSetup?: boolean | BasicSetupOptions;
  /**
   * This disables editing of the editor content by the user.
   * @default true
   */
  editable?: boolean;
  /**
   * This disables editing of the editor content by the user.
   * @default false
   */
  readOnly?: boolean;
  /**
   * Controls whether pressing the `Tab` key inserts a tab character and indents the text (`true`)
   * or behaves according to the browser's default behavior (`false`).
   * @default true
   */
  indentWithTab?: boolean;
  /** Fired whenever a change occurs to the document. */
  onChange?(value: string, viewUpdate: ViewUpdate): void;
  /** Some data on the statistics editor. */
  onStatistics?(data: Statistics): void;
  /** Fired whenever any state change occurs within the editor, including non-document changes like lint results. */
  onUpdate?(viewUpdate: ViewUpdate): void;
  /** The first time the editor executes the event. */
  onCreateEditor?(view: EditorView, state: EditorState): void;
  /**
   * Extension values can be [provided](https://codemirror.net/6/docs/ref/#state.EditorStateConfig.extensions) when creating a state to attach various kinds of configuration and behavior information.
   * They can either be built-in extension-providing objects,
   * such as [state fields](https://codemirror.net/6/docs/ref/#state.StateField) or [facet providers](https://codemirror.net/6/docs/ref/#state.Facet.of),
   * or objects with an extension in its `extension` property. Extensions can be nested in arrays arbitrarily deep—they will be flattened when processed.
   */
  extensions?: Extension[];
  /**
   * If the view is going to be mounted in a shadow root or document other than the one held by the global variable document (the default), you should pass it here.
   * Originally from the [config of EditorView](https://codemirror.net/6/docs/ref/#view.EditorView.constructor%5Econfig.root)
   */
  root?: ShadowRoot | Document;
  /**
   * Create a state from its JSON representation serialized with [toJSON](https://codemirror.net/docs/ref/#state.EditorState.toJSON) function
   */
  initialState?: {
    json: any;
    fields?: Record<string, StateField<any>>;
  };
}

export interface ReactCodeMirrorRef {
  editor?: HTMLDivElement | null;
  state?: EditorState;
  view?: EditorView;
}

const ReactCodeMirror = forwardRef<ReactCodeMirrorRef, ReactCodeMirrorProps>((props, ref) => {
  const {
    className,
    value = '',
    selection,
    extensions = [],
    onChange,
    onStatistics,
    onCreateEditor,
    onUpdate,
    autoFocus,
    theme = 'light',
    height,
    minHeight,
    maxHeight,
    width,
    minWidth,
    maxWidth,
    basicSetup,
    placeholder,
    indentWithTab,
    editable,
    readOnly,
    root,
    initialState,
    ...other
  } = props;
  const editor = useRef<HTMLDivElement>(null);
  const { state, view, container } = useCodeMirror({
    container: editor.current,
    root,
    value,
    autoFocus,
    theme,
    height,
    minHeight,
    maxHeight,
    width,
    minWidth,
    maxWidth,
    basicSetup,
    placeholder,
    indentWithTab,
    editable,
    readOnly,
    selection,
    onChange,
    onStatistics,
    onCreateEditor,
    onUpdate,
    extensions,
    initialState,
  });

  useImperativeHandle(ref, () => ({ editor: editor.current, state: state, view: view }), [
    editor,
    container,
    state,
    view,
  ]);

  // check type of value
  if (typeof value !== 'string') {
    throw new Error(`value must be typeof string but got ${typeof value}`);
  }

  const defaultClassNames = typeof theme === 'string' ? `cm-theme-${theme}` : 'cm-theme';
  return <div ref={editor} className={`${defaultClassNames}${className ? ` ${className}` : ''}`} {...other}></div>;
});

ReactCodeMirror.displayName = 'CodeMirror';

export default ReactCodeMirror;