import ReactHtmlParser, {
  convertNodeToElement,
  type DomElement,
  type DomNode,
  type Transform,
} from '@orrisroot/react-html-parser';
import type React from 'react';
import { HashLink } from 'react-router-hash-link';
import type { MultiLang } from '../../config';
import Functions from '../../functions';

interface Props {
  lang: MultiLang;
  text: string;
  dohtml?: boolean;
  dosmiley?: boolean;
  doxcode?: boolean;
  doimage?: boolean;
  dobr?: boolean;
}

const preConvertXCode = (text: string, doxcode: boolean): string => {
  if (doxcode) {
    return text.replace(/\[code\](.*)\[\/code\]/gs, (_m0, m1) => {
      return '[code]' + Functions.base64Encode(m1) + '[/code]';
    });
  }
  return text;
};

const postConvertXCode = (text: string, doxcode: boolean, doimage: boolean): string => {
  if (doxcode) {
    return text.replace(/\[code\](.*)\[\/code\]/gs, (_m0, m1) => {
      const text = convertXCode(Functions.htmlspecialchars(Functions.base64Decode(m1)), doimage);
      return '<div class="xoopsCode"><pre><code>' + text + '</code></pre></div>';
    });
  }
  return text;
};

const convertClickable = (text: string) => {
  text = text.replace(
    /(^|[^\]_a-zA-Z0-9-="'/]+)((?:https?|ftp)(?::\/\/[-_.!~*'()a-zA-Z0-9;/?:@&=+$,%#]+[a-zA-Z0-9=]))/g,
    (...matches) => {
      return (
        matches[1] +
        '<a href="' +
        matches[2] +
        '" target="_blank" rel="external noopener noreferrer">' +
        matches[2] +
        '</a>'
      );
    },
  );
  text = text.replace(
    /(^|[^\]_a-zA-Z0-9-="'/:.]+)([a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+)/g,
    (...matches) => {
      return matches[1] + '<a href="mailto:' + matches[2] + '">' + matches[2] + '</a>';
    },
  );
  return text;
};

const convertXCode = (text: string, _doimage: boolean): string => {
  // TODO: implement
  return text;
};

const convertSmiley = (text: string) => {
  // TODO: implement
  return text;
};

const convertBr = (text: string): string => {
  return text.replace(/(\r?\n|\r)/g, '<br />');
};

const cssConvert = (text: string): object => {
  const ret: any = {};
  text.split(';').forEach((line) => {
    const line_ = line.trim();
    if (line.length === 0) {
      return;
    }
    const kv = line_.split(':');
    const key = Functions.camelCase(kv[0].trim());
    const value = kv[1].trim();
    ret[key] = value;
  });
  return ret;
};

const xoopsTransform: Transform = (node: DomNode, index: number | string, transform?: Transform): React.ReactNode => {
  if (node.type === 'tag') {
    const node_ = node as DomElement;
    if (node_.name === 'a') {
      const url = node_.attribs?.['href'] || '/';
      const download = (node_.attribs && node_.attribs['download']) || '';
      const rel = (node_.attribs && node_.attribs['rel']) || '';
      const klass = (node_.attribs && node_.attribs['class']) || '';
      const isFile = download !== '' || /\.(zip|pdf|png|gif|jpg)$/.test(url);
      const isExternal = /external/.test(rel) || /external/.test(klass) || /^(mailto|https?:?\/\/)/.test(url);
      if (!isFile && !isExternal) {
        const style = node_.attribs?.['style'] || '';
        const title = node_.attribs?.['title'];
        return (
          <HashLink key={index} to={url} style={cssConvert(style)} title={title}>
            {node_.children.map((value: DomNode, index: number) => {
              return convertNodeToElement(value, index, transform);
            })}
          </HashLink>
        );
      }
    }
    if (node_.name === 'img') {
      const src = (node_.attribs && node_.attribs['src']) || '';
      node_.attribs['src'] = src.replace('`XOOPS_URL`', '');
      return convertNodeToElement(node_, index, transform);
    }
  }
};

const XoopsCode: React.FC<Props> = (props: Props) => {
  const { lang } = props;
  let text = props.text;
  const dohtml = !!props.dohtml;
  const dosmiley = !!props.dosmiley;
  const doxcode = !!props.doxcode;
  const doimage = !!props.doimage;
  const dobr = !!props.dobr;
  text = preConvertXCode(text, doxcode);
  if (!dohtml) {
    text = Functions.htmlspecialchars(text);
    text = convertClickable(text);
  }
  if (dosmiley) {
    text = convertSmiley(text);
  }
  if (doxcode) {
    text = convertXCode(text, doimage);
  }
  if (dobr) {
    text = convertBr(text);
  }
  text = postConvertXCode(text, doxcode, doimage);
  text = Functions.mlang(text, lang);
  return <div>{ReactHtmlParser(text, { transform: xoopsTransform })}</div>;
};

export default XoopsCode;