import { useCallback, useEffect, useRef, useState } from 'react';
import type { GetResponse, Layout } from '@100mslive/types-prebuilt';
import { defaultLayout } from '../constants';

// TODO: remove this usage
const fetchWithRetry = async (url = '', options = {}) => {
  const MAX_RETRIES = 4;
  let error = Error('something went wrong');
  for (let i = 0; i < MAX_RETRIES; i++) {
    try {
      return await fetch(url, options);
    } catch (err) {
      error = err as Error;
    }
  }
  console.error('Fetch failed after max retries', { url, options });
  throw error;
};

// this should take endpoint and return
export type useFetchRoomLayoutProps = {
  endpoint?: string;
  authToken: string;
};

export type useFetchRoomLayoutResponse = {
  layout: Layout | undefined;
  updateRoomLayoutForRole: (role: string) => void;
  setOriginalLayout: () => void;
};

export const useFetchRoomLayout = ({
  endpoint = '',
  authToken = '',
}: useFetchRoomLayoutProps): useFetchRoomLayoutResponse => {
  const [layout, setLayout] = useState<Layout | undefined>(undefined);
  const layoutResp = useRef<GetResponse>();
  const originalLayout = useRef<Layout>();
  const isFetchInProgress = useRef(false);

  const setOriginalLayout = useCallback(() => setLayout(originalLayout.current), []);

  const updateRoomLayoutForRole = useCallback((role: string) => {
    if (!layoutResp.current) {
      return;
    }
    const [layout] = (layoutResp.current?.data || []).filter(layout => layout.role === role);
    if (layout) {
      setLayout(layout);
    }
  }, []);
  useEffect(() => {
    (async () => {
      if (isFetchInProgress.current || !authToken) {
        return;
      }
      isFetchInProgress.current = true;
      try {
        const resp = await fetchWithRetry(endpoint || 'https://api.100ms.live/v2/layouts/ui', {
          headers: {
            Authorization: `Bearer ${authToken}`,
          },
        });
        layoutResp.current = await resp.json();
      } catch (e) {
        console.error('[Room Layout API]: Failed to fetch / process room layout. Resorting to default layout.', e);
        layoutResp.current = {
          data: [defaultLayout],
        };
      }
      let layoutForRole = layoutResp.current?.data?.[0];
      if (!layoutForRole) {
        console.error(
          '[Room Layout API]: Unable to figure out room layout from API response. Resorting to default layout.',
        );
        layoutForRole = defaultLayout;
      }
      const layout = layoutForRole;
      if (!originalLayout.current) {
        originalLayout.current = layout;
      }
      setLayout(layout);
      isFetchInProgress.current = false;
    })();
  }, [authToken, endpoint]);

  return { layout, updateRoomLayoutForRole, setOriginalLayout };
};