import { useCallback } from 'react';
import { useRef } from 'react';
import { BackHandler } from 'react-native';

/**
 * hook that dismisses the bottom sheet on the hardware back button press if it is visible
 * @param bottomSheetRef ref to the bottom sheet which is going to be closed/dismissed on the back press
 */
const useBottomSheetBackHandler = (bottomSheetRef, indexToVisible = 0) => {
  const backHandlerSubscriptionRef = useRef(null);

  const handleSheetPositionChange = useCallback(
    (index) => {
      const isBottomSheetVisible = index >= indexToVisible;
      if (isBottomSheetVisible && !backHandlerSubscriptionRef.current) {
        // setup the back handler if the bottom sheet is right in front of the user
        backHandlerSubscriptionRef.current = BackHandler.addEventListener(
          'hardwareBackPress',
          () => {
            bottomSheetRef.current?.dismiss?.() ||
              bottomSheetRef.current?.collapse?.(indexToVisible - 1);
            return true;
          },
        );
      } else if (!isBottomSheetVisible) {
        backHandlerSubscriptionRef.current?.remove();
        backHandlerSubscriptionRef.current = null;
      }
    },
    [bottomSheetRef, backHandlerSubscriptionRef],
  );
  return { handleSheetPositionChange };
};

export default useBottomSheetBackHandler;