class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val _car = remember { mutableStateOf(0) }
            val _bus = remember { mutableStateOf(0) }
            val _truck = remember { mutableStateOf(0) }
            MyApplicationTheme {
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
                    Column(modifier = Modifier.padding(10.dp)) {
                        ObjectCounter(
                            obj = "Car", counter = _car.value,
                            plus1 = { _car.value++ }, clear = { _car.value = 0}
                        )
                        ObjectCounter(
                            obj = "Bus", counter = _bus.value,
                            plus1 = { _bus.value++ }, clear = { _bus.value = 0}
                        )
                        ObjectCounter(
                            obj = "Truck", counter = _truck.value,
                            plus1 = { _truck.value++ }, clear = { _truck.value = 0}
                        )
                        CombinedButton(
                            onClick = {
                                _car.value = 0
                                _bus.value = 0
                                _truck.value = 0 },
                            indication = null
                        ) { Text(text = "AC") }
                    }
                }
            }
        }
    }
}

@Composable
fun ObjectCounter(
    obj: String, counter:Int,
    plus1: ()->Unit, clear: ()->Unit
) {
    Row(verticalAlignment = Alignment.CenterVertically) {
        Text(text = "${obj}", modifier = Modifier.width(70.dp))
        Text(text = "%05d".format(counter), modifier = Modifier.width(70.dp))
        CombinedButton(onClick = plus1, indication = null) { Text(text = "+") }
        CombinedButton(onClick = clear, indication = null) { Text(text = "C") }
    }
}