import { SmileOutlined } from '@ant-design/icons';
import { Button, Popover } from 'antd';
import React, { useState, useMemo, useRef, useEffect } from 'react';
import { useRecoilValue } from 'recoil';
import { Transforms, createEditor, Node, BaseEditor, Text } from 'slate';
import { Slate, Editable, withReact, ReactEditor } from 'slate-react';
import EmojiPicker from './EmojiPicker';
import WebsocketService from '../../../services/websocket-service';
import { websocketServiceAtom } from '../../stores/ClientConfigStore';
import { MessageType } from '../../../interfaces/socket-events';
import s from './ChatTextField.module.scss';

type CustomElement = { type: 'paragraph'; children: CustomText[] };
type CustomText = { text: string };

declare module 'slate' {
  interface CustomTypes {
    Editor: BaseEditor & ReactEditor;
    Element: CustomElement;
    Text: CustomText;
  }
}

interface Props {
  value?: string;
}

const Image = ({ element }) => (
  <img
    src={element.url}
    alt="emoji"
    style={{ display: 'inline', position: 'relative', width: '30px', bottom: '10px' }}
  />
);

const insertImage = (editor, url) => {
  const text = { text: '' };
  const image: ImageElement = { type: 'image', url, children: [text] };
  Transforms.insertNodes(editor, image);
};

const withImages = editor => {
  const { isVoid } = editor;

  editor.isVoid = element => (element.type === 'image' ? true : isVoid(element));
  editor.isInline = element => element.type === 'image';

  return editor;
};

export type EmptyText = {
  text: string;
};

type ImageElement = {
  type: 'image';
  url: string;
  children: EmptyText[];
};

const Element = props => {
  const { attributes, children, element } = props;

  switch (element.type) {
    case 'image':
      return <Image {...props} />;
    default:
      return <p {...attributes}>{children}</p>;
  }
};

const serialize = node => {
  if (Text.isText(node)) {
    let string = node.text;
    if (node.bold) {
      string = `<strong>${string}</strong>`;
    }
    return string;
  }

  const children = node.children.map(n => serialize(n)).join('');

  switch (node.type) {
    case 'paragraph':
      return `<p>${children}</p>`;
    case 'image':
      return `<img src="${node.url}" alt="emoji" />`;
    default:
      return children;
  }
};

export default function ChatTextField(props: Props) {
  const { value: originalValue } = props;
  const [showEmojis, setShowEmojis] = useState(false);
  const websocketService = useRecoilValue<WebsocketService>(websocketServiceAtom);
  const [editor] = useState(() => withImages(withReact(createEditor())));

  const size = 'small';

  const sendMessage = () => {
    if (!websocketService) {
      console.log('websocketService is not defined');
      return;
    }

    const message = serialize(editor);

    websocketService.send({ type: MessageType.CHAT, body: message });

    // Clear the editor.
    Transforms.select(editor, [0, editor.children.length - 1]);
    Transforms.delete(editor);
  };

  const handleChange = e => {};

  const handleEmojiSelect = emoji => {
    console.log(emoji);
    if (!emoji.native) {
      // Custom emoji
      const { src } = emoji;
      insertImage(editor, src);
    } else {
      // Native emoji
      const { native } = emoji;
      Transforms.insertText(editor, native);
    }
  };

  const onKeyDown = e => {
    if (e.key === 'Enter') {
      e.preventDefault();
      sendMessage();
    }
  };

  const initialValue = [
    {
      type: 'paragraph',
      children: [{ text: originalValue }],
    },
  ];

  return (
    <div>
      <Slate editor={editor} value={initialValue} onChange={handleChange}>
        <Editable
          onKeyDown={onKeyDown}
          renderElement={props => <Element {...props} />}
          placeholder="Chat message goes here..."
        />
      </Slate>
      <Button type="default" ghost title="Emoji" onClick={() => setShowEmojis(!showEmojis)}>
        <SmileOutlined style={{ color: 'rgba(0,0,0,.45)' }} />
      </Button>

      <Button size={size} type="primary" onClick={sendMessage}>
        Submit
      </Button>

      <Popover
        content={<EmojiPicker onEmojiSelect={handleEmojiSelect} />}
        trigger="click"
        onVisibleChange={visible => setShowEmojis(visible)}
        visible={showEmojis}
        placement="bottomLeft"
      />
    </div>
  );
}

ChatTextField.defaultProps = {
  value: '',
};