import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController


class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent { MyApp() }
    }
}

@Composable
fun MyApp() {
    val navController = rememberNavController()
    NavHost(navController = navController, startDestination = "main") {
        composable("main") {
            MainScreen(onNavigateSecond = { navController.navigate("second") })
        }
        composable("second") {
            SecondScreen(onBack = { navController.popBackStack() })
        }
    }
}

@Composable
fun MainScreen(onNavigateSecond: () -> Unit) {
    Column (modifier = Modifier.padding(all = 60.dp)) {
        Text("První obrazovka")
        Button(onClick = onNavigateSecond) {
            Text("Přejít na druhou obrazovku")
        }
    }
}

@Composable
fun SecondScreen(onBack: () -> Unit) {

    Column (modifier = Modifier.padding(all = 60.dp)){
        Text("Druhá obrazovka")
        Button(onClick = onBack) {
            Text("Zpět")
        }
    }
}