import 'react-native-gesture-handler';
import { StatusBar } from 'expo-status-bar';
import React, { useState } from 'react';
import Switch from 'react-native';
import { SafeAreaProvider } from 'react-native-safe-area-context';

import useCachedResources from './hooks/useCachedResources';
import useColorScheme from './hooks/useColorScheme';
import Navigation from './navigation';

export default function App() {
  const isLoadingComplete = useCachedResources();
  const colorScheme = useColorScheme();
  const [isKM, setIsKM] = useState(false);
  const toggleUnits = () => setIsKM(previousState => !previousState);

  if (!isLoadingComplete) {
    return null;
  } else {
    return (
      <SafeAreaProvider>
        <Navigation colorScheme={colorScheme} />
        <StatusBar />
      </SafeAreaProvider>
    );
  }
}