// ClickCounter2 Example
// Source code file: MainActivity.kt
// Each time the Click Me button is clicked, the
// count increments by 1.  The Reset button
// sets the count back to zero.
package it372.ssmith.clickcounter2
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.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
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 {
             MainDisplay( )
        }
    }
}

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

@Composable
fun MainDisplay( ) {

    var count = remember { mutableStateOf(0) }

    Column(
        modifier = Modifier
            .padding(40.dp)
            .fillMaxSize(),
        horizontalAlignment = Alignment.CenterHorizontally) {

        Text(
            text = count.value.toString(),
            modifier = Modifier.padding(30.dp),
            fontSize = 200.sp
        )

        Button(onClick = {
            var n = count.value;
            n++;
            count.value = n;
        })
        {
            Text(text = "Click Me")
        }

        // A spacer adds invisible vertical space
        // between elements.
        Spacer(modifier = Modifier.height(16.dp))

        Button(onClick = {
            count.value = 0;
        })
        {
            Text(text = "Reset")
        }
    }
}