Tugas 6 PPB A

 Nama: Meylina Tesa Hapsari

NRP: 5025221149

Kelas: PPB A

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            KonversimatauangTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    CurrencyConverter(modifier = Modifier.padding(innerPadding))
                }
            }
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun CurrencyConverter(modifier: Modifier = Modifier) {
    val exchangeRates = mapOf(
        "USD - Dollar AS" to 0.000063,
        "EUR - Euro" to 0.000058,
        "JPY - Yen Japan" to 9.52,
        "GBP - Pound England" to 0.00005,
        "AUD - Dollar Australia" to 0.0001,
        "CAD - Dollar Canada" to 0.000086,
        "CHF - Franc Swiss" to 0.000057,
        "SGD - Dollar Singaporean" to 0.000084,
        "MYR - Ringgit Malaysia" to 0.0003,
        "CNY - Yuan China" to 0.00045,
    )

    var inputValue by remember { mutableStateOf("") }
    var selectedCurrency by remember { mutableStateOf(exchangeRates.keys.first()) }
    var result by remember { mutableStateOf("") }

    Column(modifier = Modifier
        .padding(16.dp)
        .fillMaxSize()) {

        OutlinedTextField(
            value = inputValue,
            onValueChange = { inputValue = it },
            label = { Text("Input IDR") },
            modifier = Modifier.fillMaxWidth(),
            keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
        )

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

        // Dropdown
        var expanded by remember { mutableStateOf(false) }
        ExposedDropdownMenuBox(
            expanded = expanded,
            onExpandedChange = { expanded = it },
        ) {
            OutlinedTextField(
                value = selectedCurrency,
                onValueChange = {},
                label = { Text("Select the destination currency") },
                readOnly = true,
                trailingIcon = { ExposedDropdownMenuDefaults.TrailingIcon(expanded = expanded) },
                modifier = Modifier
                    .fillMaxWidth()
                    .menuAnchor() // Penting untuk menautkan dropdown dengan field
            )
            ExposedDropdownMenu(
                expanded = expanded,
                onDismissRequest = { expanded = false }
            ) {
                exchangeRates.keys.forEach { currency ->
                    DropdownMenuItem(
                        text = { Text(currency) },
                        onClick = {
                            selectedCurrency = currency
                            expanded = false
                        }
                    )
                }
            }
        }

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

        Button(onClick = {
            val idr = inputValue.toDoubleOrNull()
            val rate = exchangeRates[selectedCurrency] ?: 1.0

            result = if (idr != null) {
                val converted = idr * rate
                "Result: $converted $selectedCurrency"
            } else {
                "Invalid Input"
            }
        }, modifier = Modifier.fillMaxWidth()) {
            Text("Conversion")
        }

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

        Text(result)
    }
}