// TestRadioButton2 Example
// Source code file: MainActivity.kt
// Display the newly checked radio button when
// the checked radio button changed

// Jetpack Compose does not have radiobutton groups.
// Instead, keep a single state variable that indicates
// which radiobutton is selected.

package it372.ssmith.testradiobutton2
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.Row
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.RadioButton
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

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

@Composable
fun MainLayout( ) {

    // State variables for composables
    var selected = remember { mutableStateOf(0) }
    var textDisplay = remember { mutableStateOf("") }
    val vegMap : String = mapOf(0 to "", 1 to "Asparagus",
            2 to "Broccoli", 3 to "Cabbage").toString( )

    Column(Modifier.padding(all = 50.dp),
        horizontalAlignment = Alignment.CenterHorizontally) {

        Row(verticalAlignment = Alignment.CenterVertically) {
            RadioButton(
                selected = selected.value == 1,
                onClick = {
                    selected.value = 1
                    textDisplay.value = getVegetable(1)
                },
                modifier = Modifier
                    .padding(all = 20.dp)
                    .size(width = 50.dp, height = 50.dp)
            )
            Text(text = "Asparagus")
        }

        Row(verticalAlignment = Alignment.CenterVertically) {
            RadioButton(
                selected = selected.value == 2,
                onClick = {
                    selected.value = 1
                    textDisplay.value = getVegetable(2)
                },
                modifier = Modifier
                    .padding(all = 20.dp)
                    .size(width = 50.dp, height = 50.dp)
            )
            Text(text = "Broccoli")
        }

        Row(verticalAlignment = Alignment.CenterVertically) {
            RadioButton(
                selected = selected.value == 3,
                onClick = {
                    selected.value = 3
                    textDisplay.value = getVegetable(3)
                },
                modifier = Modifier
                    .padding(all = 20.dp)
                    .size(width = 50.dp, height = 50.dp)
            )
            Text(text = "Cabbage")
        }

        Text(text = textDisplay.value, Modifier
            .padding(all = 30.dp)
            .size(width=200.dp, height=100.dp),
            fontSize = 25.sp)
    }
}

@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
    MainLayout( )
}

// Get vegetable name from index for text display.
fun getVegetable(index : Int) : String {
    when(index) {
        0 -> return ""
        1 -> return "Asparagus"
        2 -> return "Broccoli"
        3 -> return "Cabbage"
        else -> return ""
    }
}