import { useEffect, useState } from 'react';

import { loadAsync } from './Font';
import { FontSource } from './Font.types';

// @needsAudit
/**
 * ```ts
 * const [loaded, error] = useFonts({ ... });
 * ```
 * Load a map of fonts with [`loadAsync`](#loadasync). This returns a `boolean` if the fonts are
 * loaded and ready to use. It also returns an error if something went wrong, to use in development.
 *
 * > Note, the fonts are not "reloaded" when you dynamically change the font map.
 *
 * @param map A map of `fontFamily`s to [`FontSource`](#fontsource)s. After loading the font you can
 * use the key in the `fontFamily` style prop of a `Text` element.
 *
 * @return
 * - __loaded__ (`boolean`) - A boolean to detect if the font for `fontFamily` has finished
 * loading.
 * - __error__ (`Error | null`) - An error encountered when loading the fonts.
 */
export function useFonts(map: string | Record<string, FontSource>): [boolean, Error | null] {
  const [loaded, setLoaded] = useState(false);
  const [error, setError] = useState<Error | null>(null);

  useEffect(() => {
    loadAsync(map)
      .then(() => setLoaded(true))
      .catch(setError);
  }, []);

  return [loaded, error];
}