Mobile lab 5

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/.expo/README.md

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+> Why do I have a folder named ".expo" in my project?
+
+The ".expo" folder is created when an Expo project is started using "expo start" command.
+
+> What do the files contain?
+
+- "devices.json": contains information about devices that have recently opened this project. This is used to populate the "Development sessions" list in your development builds.
+- "settings.json": contains the server configuration that is used to serve the application manifest.
+
+> Should I commit the ".expo" folder?
+
+No, you should not share the ".expo" folder. It does not contain any information that is relevant for other developers working on the project, it is specific to your machine.
+Upon project creation, the ".expo" folder is already added to your ".gitignore" file.

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/.expo/devices.json

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+{
+  "devices": []
+}

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/App.js

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+import { StatusBar } from "expo-status-bar";
+import React, { useState, useEffect } from "react";
+import { View, TextInput, Text, Button, Alert, StyleSheet } from "react-native";
+import { db, firestore, auth } from "./FirebaseConfig";
+import {
+  createUserWithEmailAndPassword,
+  signOut,
+  signInWithEmailAndPassword,
+  onAuthStateChanged,
+} from "firebase/auth";
+import { ref, set, onValue } from "firebase/database";
+import { doc, setDoc, onSnapshot } from "firebase/firestore";
+
+export default function App() {
+  const [registrationEmail, setRegistrationEmail] = useState("");
+  const [registrationPassword, setRegistrationPassword] = useState("");
+  const [loginEmail, setLoginEmail] = useState("");
+  const [loginPassword, setLoginPassword] = useState("");
+  const [loggedIn, setLoggedIn] = useState(false);
+  const [databaseData, setDatabaseData] = useState("");
+  const [user, setUser] = useState(null);
+
+  // Monitor authentication state
+  useEffect(() => {
+    const unsubscribe = onAuthStateChanged(auth, (currentUser) => {
+      setUser(currentUser);
+      setLoggedIn(!!currentUser);
+    });
+    return () => unsubscribe();
+  }, []);
+
+  const registerWithFirebase = () => {
+    if (registrationEmail.length < 4) {
+      Alert.alert("Please enter an email address.");
+      return;
+    }
+
+    if (registrationPassword.length < 4) {
+      Alert.alert("Please enter a password.");
+      return;
+    }
+
+    createUserWithEmailAndPassword(
+      auth,
+      registrationEmail,
+      registrationPassword
+    )
+      .then((userCredential) => {
+        Alert.alert("User registered successfully!");
+        setRegistrationEmail("");
+        setRegistrationPassword("");
+      })
+      .catch((error) => {
+        console.log("Registration error:", error);
+        if (error.code === "auth/weak-password") {
+          Alert.alert("The password is too weak.");
+        } else if (error.code === "auth/email-already-in-use") {
+          Alert.alert("This email is already registered.");
+        } else {
+          Alert.alert(error.message);
+        }
+      });
+  };
+
+  const loginWithFirebase = () => {
+    if (loginEmail.length < 4) {
+      Alert.alert("Please enter an email address.");
+      return;
+    }
+
+    if (loginPassword.length < 4) {
+      Alert.alert("Please enter a password.");
+      return;
+    }
+
+    signInWithEmailAndPassword(auth, loginEmail, loginPassword)
+      .then((userCredential) => {
+        Alert.alert("User logged in successfully!");
+        setLoginEmail("");
+        setLoginPassword("");
+      })
+      .catch((error) => {
+        console.log("Login error:", error);
+        if (error.code === "auth/wrong-password") {
+          Alert.alert("Wrong password.");
+        } else if (error.code === "auth/user-not-found") {
+          Alert.alert("User not found.");
+        } else {
+          Alert.alert(error.message);
+        }
+      });
+  };
+
+  const signoutWithFirebase = () => {
+    signOut(auth)
+      .then(() => {
+        Alert.alert("User was logged out!");
+        setDatabaseData("");
+      })
+      .catch((error) => {
+        Alert.alert("Error signing out:", error.message);
+      });
+  };
+
+  const saveDataWithFirebase = () => {
+    if (!user) {
+      Alert.alert("Please log in first.");
+      return;
+    }
+
+    const userID = user.uid;
+
+    // Save to Realtime DB
+    set(ref(db, "users/" + userID), {
+      text: databaseData,
+      timestamp: Date.now(),
+    })
+      .then(() => {
+        console.log("Data saved to Realtime DB");
+      })
+      .catch((error) => {
+        console.log("Realtime DB error:", error);
+      });
+
+    // Save to Firestore
+    setDoc(
+      doc(firestore, "users", userID),
+      {
+        text: databaseData,
+        timestamp: Date.now(),
+      },
+      { merge: true }
+    )
+      .then(() => {
+        Alert.alert("Data saved successfully!");
+      })
+      .catch((error) => {
+        Alert.alert("Error saving data");
+        console.log("Firestore error:", error);
+      });
+  };
+
+  const retrieveDataWithFirebase = () => {
+    if (!user) {
+      Alert.alert("Please log in first.");
+      return;
+    }
+
+    const userID = user.uid;
+    const dbRef = ref(db, "users/" + userID);
+
+    // Using Realtime DB
+    onValue(dbRef, (snapshot) => {
+      if (snapshot.exists()) {
+        const data = snapshot.val();
+        setDatabaseData(data.text || "");
+        Alert.alert("Data retrieved from Realtime DB");
+      } else {
+        Alert.alert("No data found");
+      }
+    });
+
+    // Uncomment for Firestore
+    /*
+    const unsubscribe = onSnapshot(doc(firestore, "users", userID), (doc) => {
+      if (doc.exists()) {
+        const data = doc.data();
+        setDatabaseData(data.text || "");
+        Alert.alert("Data retrieved from Firestore");
+      } else {
+        Alert.alert("No data found in Firestore");
+      }
+    });
+    */
+  };
+
+  return (
+    <View style={styles.form}>
+      <StatusBar style="auto" />
+
+      {!loggedIn ? (
+        <View>
+          <View style={styles.section}>
+            <Text style={styles.label}>Lab 5 - l_mclean215318</Text>
+            <Text style={styles.label}>Register with Firebase</Text>
+            <TextInput
+              style={styles.textInput}
+              onChangeText={setRegistrationEmail}
+              value={registrationEmail}
+              autoCapitalize="none"
+              autoCorrect={false}
+              autoCompleteType="email"
+              keyboardType="email-address"
+              placeholder="Email"
+            />
+            <TextInput
+              style={styles.textInput}
+              onChangeText={setRegistrationPassword}
+              value={registrationPassword}
+              autoCapitalize="none"
+              autoCorrect={false}
+              autoCompleteType="password"
+              placeholder="Password"
+              secureTextEntry={true}
+            />
+            <Button title="Register" onPress={registerWithFirebase} />
+          </View>
+
+          <View style={styles.section}>
+            <Text style={styles.label}>Sign In with Firebase</Text>
+            <TextInput
+              style={styles.textInput}
+              onChangeText={setLoginEmail}
+              value={loginEmail}
+              autoCapitalize="none"
+              autoCorrect={false}
+              autoCompleteType="email"
+              keyboardType="email-address"
+              placeholder="Email"
+            />
+            <TextInput
+              style={styles.textInput}
+              onChangeText={setLoginPassword}
+              value={loginPassword}
+              autoCapitalize="none"
+              autoCorrect={false}
+              autoCompleteType="password"
+              placeholder="Password"
+              secureTextEntry={true}
+            />
+            <Button title="Login" onPress={loginWithFirebase} />
+          </View>
+        </View>
+      ) : (
+        <View>
+          <Text style={styles.welcome}>Welcome, {user?.email}</Text>
+          <TextInput
+            style={styles.textArea}
+            multiline={true}
+            numberOfLines={4}
+            onChangeText={setDatabaseData}
+            value={databaseData}
+            placeholder="Enter your data here..."
+          />
+          <View style={styles.buttonContainer}>
+            <Button title="Save Data" onPress={saveDataWithFirebase} />
+            <Button title="Load Data" onPress={retrieveDataWithFirebase} />
+          </View>
+          <View style={styles.signOutButton}>
+            <Button
+              title="Sign Out"
+              onPress={signoutWithFirebase}
+              color="#ff4444"
+            />
+          </View>
+        </View>
+      )}
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  form: {
+    flex: 1,
+    margin: 30,
+    marginTop: 60,
+  },
+  section: {
+    marginBottom: 30,
+  },
+  label: {
+    fontSize: 18,
+    marginBottom: 15,
+    textAlign: "center",
+    fontWeight: "bold",
+  },
+  welcome: {
+    fontSize: 18,
+    marginBottom: 20,
+    textAlign: "center",
+    fontWeight: "bold",
+  },
+  textInput: {
+    borderColor: "#ccc",
+    borderWidth: 1,
+    marginBottom: 15,
+    paddingVertical: 8,
+    paddingHorizontal: 10,
+    borderRadius: 5,
+  },
+  textArea: {
+    borderColor: "#ccc",
+    borderWidth: 1,
+    marginBottom: 15,
+    paddingVertical: 8,
+    paddingHorizontal: 10,
+    borderRadius: 5,
+    height: 100,
+    textAlignVertical: "top",
+  },
+  buttonContainer: {
+    flexDirection: "row",
+    justifyContent: "space-between",
+    marginBottom: 20,
+  },
+  signOutButton: {
+    marginTop: 20,
+  },
+});

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/FirebaseConfig.js

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+import { initializeApp } from "firebase/app";
+import { getDatabase } from "firebase/database";
+import { getAuth } from "firebase/auth";
+import { getFirestore } from "firebase/firestore";
+
+// Your Firebase config
+const firebaseConfig = {
+  apiKey: "AIzaSyBfvjd5heEO3nS59rQSqY3Vsr36Pv2V3RU",
+  authDomain: "week6-fb-db.firebaseapp.com",
+  databaseURL: "https://week6-fb-db-default-rtdb.firebaseio.com",
+  projectId: "week6-fb-db",
+  storageBucket: "week6-fb-db.firebasestorage.app",
+  messagingSenderId: "854313991657",
+  appId: "1:854313991657:web:42859a9b1c0bd06f391f78",
+};
+
+// Initialize Firebase
+const app = initializeApp(firebaseConfig);
+export const db = getDatabase(app);
+export const auth = getAuth(app);
+export const firestore = getFirestore(app);

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/app.json

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+{
+  "expo": {
+    "name": "firebase-DB",
+    "slug": "firebase-DB",
+    "version": "1.0.0",
+    "orientation": "portrait",
+    "icon": "./assets/icon.png",
+    "userInterfaceStyle": "light",
+    "newArchEnabled": true,
+    "splash": {
+      "image": "./assets/splash-icon.png",
+      "resizeMode": "contain",
+      "backgroundColor": "#ffffff"
+    },
+    "ios": {
+      "supportsTablet": true
+    },
+    "android": {
+      "adaptiveIcon": {
+        "foregroundImage": "./assets/adaptive-icon.png",
+        "backgroundColor": "#ffffff"
+      },
+      "edgeToEdgeEnabled": true
+    },
+    "web": {
+      "favicon": "./assets/favicon.png"
+    }
+  }
+}

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/index.js

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+import { registerRootComponent } from 'expo';
+
+import App from './App';
+
+// registerRootComponent calls AppRegistry.registerComponent('main', () => App);
+// It also ensures that whether you load the app in Expo Go or in a native build,
+// the environment is set up appropriately
+registerRootComponent(App);

INFO-3173 Mobile Development 1/Labs/Lab 5/firebase-DB/package.json

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+{
+  "name": "firebase-db",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web"
+  },
+  "dependencies": {
+    "@react-native-async-storage/async-storage": "^1.24.0",
+    "expo": "~54.0.12",
+    "expo-status-bar": "~3.0.8",
+    "firebase": "^12.3.0",
+    "react": "19.1.0",
+    "react-native": "0.81.4"
+  },
+  "private": true,
+  "devDependencies": {
+    "@expo/cli": "^54.0.10"
+  }
+}