import { forwardRef } from 'preact/compat';
import { useLocation } from 'react-router-dom';

import states from '../utils/states';

/* NOTES
   =====
   Initially this uses <NavLink> from react-router-dom, but it doesn't work:
   1. It interferes with nested <a> inside <a> and it's difficult to preventDefault/stopPropagation from the nested <a>
   2. isActive doesn't work properly with the weird routes that's set up in this app, due to the faux "location" to make the modals work and prevent unmounting
   3. Not using <Link state/> because it modifies history.state that *persists* across page reloads. I don't need that, so using valtio's states instead.
*/

const Link = forwardRef((props, ref) => {
  let routerLocation;
  try {
    routerLocation = useLocation();
  } catch (e) {}
  let hash = (location.hash || '').replace(/^#/, '').trim();
  if (hash === '') hash = '/';
  const { to, ...restProps } = props;

  // Handle encodeURIComponent of searchParams values
  if (!!hash && hash !== '/' && hash.includes('?')) {
    const parsedHash = new URL(hash, location.origin); // Fake base URL
    if (parsedHash.searchParams.size) {
      const searchParamsStr = Array.from(parsedHash.searchParams.entries())
        .map(([key, value]) => `${key}=${encodeURIComponent(value)}`)
        .join('&');
      hash = parsedHash.pathname + '?' + searchParamsStr;
    }
  }

  const isActive = hash === to || decodeURIComponent(hash) === to;
  return (
    <a
      ref={ref}
      href={`#${to}`}
      {...restProps}
      class={`${props.class || ''} ${isActive ? 'is-active' : ''}`}
      onClick={(e) => {
        if (e.currentTarget?.parentNode?.closest('a')) {
          // If this <a> is nested inside another <a>
          e.stopPropagation();
        }
        if (routerLocation) states.prevLocation = routerLocation;
        props.onClick?.(e);
      }}
    />
  );
});

export default Link;