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App.js
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App.js
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import React, { useState, createContext, useContext, useEffect } from "react";
import { View, ActivityIndicator } from "react-native";
import { NavigationContainer } from "@react-navigation/native";
import { createStackNavigator } from "@react-navigation/stack";
import { onAuthStateChanged } from "firebase/auth";
import { auth } from "./config/firebase";
import Chat from "./screens/Chat";
import Login from "./screens/Login";
import Signup from "./screens/Signup";
import Home from "./screens/Home";
const Stack = createStackNavigator();
const AuthenticatedUserContext = createContext({});
const AuthenticatedUserProvider = ({ children }) => {
const [user, setUser] = useState(null);
return (
<AuthenticatedUserContext.Provider value={{ user, setUser }}>
{children}
</AuthenticatedUserContext.Provider>
);
};
function ChatStack() {
return (
<Stack.Navigator defaultScreenOptions={Home}>
<Stack.Screen name="Home" component={Home} />
<Stack.Screen name="Chat" component={Chat} />
</Stack.Navigator>
);
}
function AuthStack() {
return (
<Stack.Navigator defaultScreenOptions={Login}>
<Stack.Screen name="Login" component={Login} />
<Stack.Screen name="Signup" component={Signup} />
</Stack.Navigator>
);
}
function RootNavigator() {
const { user, setUser } = useContext(AuthenticatedUserContext);
const [loading, setLoading] = useState(true);
useEffect(() => {
const unsubscribe = onAuthStateChanged(auth, async (authenticatedUser) => {
authenticatedUser ? setUser(authenticatedUser) : setUser(null);
setLoading(false);
});
return () => unsubscribe();
}, [user]);
if (loading) {
return (
<View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
<ActivityIndicator size="large" />
</View>
);
}
return (
<NavigationContainer>
{user ? <ChatStack /> : <AuthStack />}
</NavigationContainer>
);
}
export default function App() {
return (
<AuthenticatedUserProvider>
<RootNavigator />
</AuthenticatedUserProvider>
);
}