import { Setting } from './interface';
import { Type } from './enum';
import { DefaultSetting } from './constants/defaultSetting';
import { convertTextLink } from './util/convertTextLink';

let setting: Setting;

export function start(s: Setting = DefaultSetting) {
  setting = {
    ...DefaultSetting,
    ...s,
    link: { ...DefaultSetting.link, ...s.link },
    atsign: { ...DefaultSetting.atsign, ...s.atsign },
    hashTag: { ...DefaultSetting.hashTag, ...s.hashTag },
  };

  replaceLinks(Type.ONLOAD);
}

export function convert(text: string, s: Setting = DefaultSetting) {
  setting = { ...DefaultSetting, ...s };
  return replaceLinks(Type.CONVERT, text);
}

function replaceLinks(type: Type, t: string = '') {
  if (type === Type.ONLOAD) {
    if (typeof window !== 'undefined') {
      window.addEventListener('load', function () {
        // Find all elements in the page that contain text
        const elements = document.querySelector('body');

        getAllElements(elements);
      });
    }
  } else if (type === Type.CONVERT) {
    return convertTextLink(t, setting);
  }
}

function getAllElements(node) {
  if (node.nodeType === Node.TEXT_NODE && node.textContent.trim() !== '') {
    const parentTag = node.parentNode;
    if (parentTag.tagName !== 'A' || parentTag.tagName != 'SCRIPT') {
      let html = parentTag.innerHTML;
      html = html.replace(
        node.textContent,
        convertTextLink(node.textContent, setting)
      );

      parentTag.innerHTML = html;
    }
  } else if (node.nodeType === Node.ELEMENT_NODE) {
    if (node.tagName !== 'A') {
      let len = node.childNodes.length;
      let n = node;
      for (let i = 0; i < len; i++) {
        getAllElements(n.childNodes[i]);
      }
    }
  }
}

export const linkStyler = {
  start: start,
  convert: convert,
};