package com.example.login 

 

import android.os.Bundle 

import android.util.Log 

import androidx.activity.ComponentActivity 

import androidx.activity.compose.setContent 

import androidx.compose.foundation.Image 

import androidx.compose.foundation.clickable 

import androidx.compose.foundation.layout.* 

import androidx.compose.material3.* 

import androidx.compose.runtime.* 

import androidx.compose.ui.Alignment 

import androidx.compose.ui.Modifier 

import androidx.compose.ui.graphics.painter.Painter 

import androidx.compose.ui.res.painterResource 

import androidx.compose.ui.unit.dp 

import androidx.navigation.NavController 

import androidx.navigation.compose.NavHost 

import androidx.navigation.compose.composable 

import androidx.navigation.compose.rememberNavController 

import com.example.mynavigation.ui.theme.MyNavigationTheme 

 

class MainActivity : ComponentActivity() { 

    override fun onCreate(savedInstanceState: Bundle?) { 

        super.onCreate(savedInstanceState) 

        setContent { 

            MyNavigationTheme { 

                MyApplicationNavigation() 

            } 

        } 

    } 

} 

 

@Composable 

fun ScreenA(navController: NavController) { 

    var email by remember { mutableStateOf("") } 

    var password by remember { mutableStateOf("") } 

    var message by remember { mutableStateOf("") } 

 

    Column( 

        modifier = Modifier 

            .fillMaxSize() 

            .padding(16.dp), 

        horizontalAlignment = Alignment.CenterHorizontally, 

        verticalArrangement = Arrangement.Center 

    ) { 

        val loginImage: Painter = painterResource(id = R.drawable.dice_1) 

 

        Image( 

            painter = loginImage, 

            contentDescription = "login image", 

            modifier = Modifier.size(200.dp) 

        ) 

        Text(text = "Login") 

        Spacer(modifier = Modifier.height(16.dp)) 

 

        OutlinedTextField( 

            value = email, 

            onValueChange = { email = it }, 

            label = { Text(text = "Email") } 

        ) 

        Spacer(modifier = Modifier.height(8.dp)) 

 

        OutlinedTextField( 

            value = password, 

            onValueChange = { password = it }, 

            label = { Text(text = "Password") } 

        ) 

        Spacer(modifier = Modifier.height(16.dp)) 

 

        Button(onClick = { 

            if (email == "cse" && password == "cse") { 

                navController.navigate("screenB/$email/$password") 

            } else { 

                navController.navigate("screenC/$email/$password") 

            } 

            Log.i("Credential", "email: $email password: $password") 

        }) { 

            Text(text = "Login") 

        } 

        Spacer(modifier = Modifier.height(4.dp)) 

 

        Text(text = "Forgot Password?", modifier = Modifier.clickable { }) 

        Spacer(modifier = Modifier.height(4.dp)) 

        Text(text = "or sign in with") 

        Spacer(modifier = Modifier.height(16.dp)) 

        Text(text = message) 

    } 

} 

 

@Composable 

fun ScreenB(email: String, password: String) { 

    Column( 

        modifier = Modifier 

            .fillMaxSize() 

            .padding(16.dp), 

        horizontalAlignment = Alignment.CenterHorizontally, 

        verticalArrangement = Arrangement.Center 

    ) { 

        Text(text = "Email is: $email") 

        Text(text = "Password is: $password") 

        Text(text = "Valid") 

    } 

} 

 

@Composable 

fun ScreenC(email: String, password: String) { 

    Column( 

        modifier = Modifier 

            .fillMaxSize() 

            .padding(16.dp), 

        horizontalAlignment = Alignment.CenterHorizontally, 

        verticalArrangement = Arrangement.Center 

    ) { 

        val errorImage: Painter = painterResource(id = R.drawable.dice_1) 

        Image( 

            painter = errorImage, 

            contentDescription = "Invalid email or password", 

            modifier = Modifier.size(200.dp) 

        ) 

 

        Text(text = "Invalid email or password.") 

    } 

} 

 

@Composable 

fun MyApplicationNavigation() { 

    val navController = rememberNavController() 

    NavHost(navController = navController, startDestination = "/screenA") { 

        composable("/screenA") { 

            ScreenA(navController) 

        } 

        composable("screenB/{email}/{password}") { 

            val email = it.arguments?.getString("email") ?: "" 

            val password = it.arguments?.getString("password") ?: "" 

            ScreenB(email, password) 

        } 

        composable("screenC/{email}/{password}") { 

            val email = it.arguments?.getString("email") ?: "" 

            val password = it.arguments?.getString("password") ?: "" 

            ScreenC(email, password) 

        } 

    } 

}