1dependencies {
2    // Firebase BoMのインポート
3    implementation(platform("com.google.firebase:firebase-bom:33.1.1"))
4
5    // 使用するFirebaseプロダクトの依存関係を追加
6    // BoMを使用している場合、バージョンを指定しないでください
7    implementation("com.google.firebase:firebase-analytics")
8    implementation("com.google.firebase:firebase-auth-ktx")
9}

1    //SignInするメソッド
2    private fun signIn(
3        auth: FirebaseAuth,
4        email: String,
5        password: String,
6        onComplete: (Boolean) -> Unit
7    ) {
8        auth.signInWithEmailAndPassword(email, password)
9            .addOnCompleteListener(this) {
10                onComplete(it.isSuccessful)
11            }
12    }

1    //SignUpをするメソッド
2    private fun signUp(
3        auth: FirebaseAuth,
4        email: String,
5        password: String,
6        onComplete: (Boolean) -> Unit
7    ) {
8        auth.createUserWithEmailAndPassword(email, password)
9            .addOnCompleteListener(this) {
10                onComplete(it.isSuccessful)
11            }
12    }

1    //SignOutするメソッド
2    private fun signOut(
3        auth: FirebaseAuth
4    ) {
5        auth.signOut()
6    }

1object LoginDestinations {
2    const val SIGN_IN_ROUTE = "SignInScreen"
3    const val HOME_ROUTE = "HomeScreen"
4}
5
6class MainActivity : ComponentActivity() {
7    private lateinit var auth: FirebaseAuth
8
9    override fun onCreate(savedInstanceState: Bundle?) {
10        super.onCreate(savedInstanceState)
11        auth = Firebase.auth
12        setContent {
13            val navController = rememberNavController()
14            val startDestination =
15                if (auth.currentUser == null) LoginDestinations.SIGN_IN_ROUTE else LoginDestinations.HOME_ROUTE
16            NavHost(
17                navController = navController,
18                startDestination = startDestination
19            ) {
20                composable(route = LoginDestinations.SIGN_IN_ROUTE) {
21                    val context = LocalContext.current
22                    SignInScreen(
23                        onSignInClick = { email, password ->
24                            signIn(auth, email, password) { success ->
25                                if (success) {
26                                    navController.navigate(LoginDestinations.SIGN_IN_ROUTE)
27                                } else {
28                                    Toast.makeText(
29                                        context,
30                                        getString(R.string.failed_sign_In_message),
31                                        Toast.LENGTH_SHORT
32                                    ).show()
33                                }
34                            }
35                        },
36                        onSignUpClick = { email, password ->
37                            signUp(auth, email, password) { success ->
38                                if (success) {
39                                    navController.navigate(LoginDestinations.HOME_ROUTE)
40                                } else {
41                                    Toast.makeText(
42                                        context,
43                                        getString(R.string.failed_sign_up_message),
44                                        Toast.LENGTH_SHORT
45                                    ).show()
46                                }
47                            }
48                        }
49                    )
50                }
51
52                composable(route = LoginDestinations.HOME_ROUTE) {
53                    HomeScreen(
54                        onSignOutClick = {
55                            signOut(auth)
56                            navController.navigate(LoginDestinations.SIGN_IN_ROUTE)
57                        }
58                    )
59                }
60            }
61        }
62    }
63
64    //サインインするメソッド
65    private fun signIn(
66        auth: FirebaseAuth,
67        email: String,
68        password: String,
69        onComplete: (Boolean) -> Unit
70    ) {
71        auth.signInWithEmailAndPassword(email, password)
72            .addOnCompleteListener(this) {
73                onComplete(it.isSuccessful)
74            }
75    }
76
77    //新規登録をするメソッド
78    private fun signUp(
79        auth: FirebaseAuth,
80        email: String,
81        password: String,
82        onComplete: (Boolean) -> Unit
83    ) {
84        auth.createUserWithEmailAndPassword(email, password)
85            .addOnCompleteListener(this) {
86                onComplete(it.isSuccessful)
87            }
88    }
89
90    //サインアウトするメソッド
91    private fun signOut(
92        auth: FirebaseAuth
93    ) {
94        auth.signOut()
95    }
96}