// Fungsi untuk melakukan konversi mata uang
async function convertCurrency() {
    const amount = document.getElementById('amount').value;
    const fromCurrency = document.getElementById('from-currency').value;
    const toCurrency = document.getElementById('to-currency').value;
    const result = document.getElementById('result');
    const convertBtn = document.getElementById('convert-btn');

    // Validasi input
    if (amount && fromCurrency && toCurrency) {
        try {
            // Mendapatkan data kurs mata uang
            const response = await fetch(`https://api.exchangerate-api.com/v4/latest/${fromCurrency}`);
            const data = await response.json();
            const rate = data.rates[toCurrency];
            const convertedAmount = (amount * rate).toFixed(2);

            // Menampilkan hasil konversi
            result.innerHTML = `${amount} ${fromCurrency} = ${convertedAmount} ${toCurrency}`;

            // Sembunyikan tombol Convert setelah konversi otomatis
            convertBtn.style.display = 'none';
        } catch (error) {
            result.innerText = "Error fetching exchange rates!";
        }
    }
}

// Fungsi untuk menukar mata uang From dan To
function swapCurrencies() {
    const fromCurrency = document.getElementById('from-currency');
    const toCurrency = document.getElementById('to-currency');

    // Tukar nilai mata uang
    const temp = fromCurrency.value;
    fromCurrency.value = toCurrency.value;
    toCurrency.value = temp;

    // Lakukan konversi otomatis setelah swap
    convertCurrency();
}

// Event listener untuk input amount agar otomatis konversi
document.getElementById('amount').addEventListener('input', convertCurrency);

// Event listener untuk perubahan mata uang (From dan To) agar tombol Convert muncul kembali
document.getElementById('from-currency').addEventListener('change', () => {
    document.getElementById('convert-btn').style.display = 'block';
    document.getElementById('result').innerHTML = '';
});

document.getElementById('to-currency').addEventListener('change', () => {
    document.getElementById('convert-btn').style.display = 'block';
    document.getElementById('result').innerHTML = '';
});

// Fungsi untuk menangani scroll dan mengganti warna latar belakang
window.onscroll = function() {
    const navbar = document.querySelector('.navbar');
    const howToUse = document.querySelector('.how-to-use');
    const steps = document.querySelector('.steps');
    const footer = document.querySelector('footer');

    if (window.scrollY > 200) {
        navbar.style.backgroundColor = '#004d00'; // Darker Green
        howToUse.style.backgroundColor = '#004d00'; // Darker Green
        steps.forEach(step => {
            step.style.backgroundColor = '#004d00'; // Darker Green for steps
        });
        footer.style.backgroundColor = '#666666'; // Darker Gray
    } else {
        navbar.style.backgroundColor = '#006400'; // Original Green
        howToUse.style.backgroundColor = '#006400'; // Original Green
        steps.forEach(step => {
            step.style.backgroundColor = '#006400'; // Original Green for steps
        });
        footer.style.backgroundColor = '#808080'; // Original Gray
    }
};

// Fungsi untuk memuat pilihan mata uang
function loadCurrencies() {
    const currencies = [
        'BND', 'KHR', 'IDR', 'LAK', 'MYR', 'MMK', 'PHP', 'SGD', 'THB', 'VND', 
        'EUR', 'GBP', 'CHF', 'RUB', 'TRY', 'USD', 'CAD', 'BRL', 'ARS', 'ZAR', 
        'JPY', 'CNY', 'KRW', 'KPW', 'HKD'
    ];
    
    const fromCurrency = document.getElementById('from-currency');
    const toCurrency = document.getElementById('to-currency');
    
    currencies.forEach(currency => {
        const optionFrom = document.createElement('option');
        optionFrom.value = currency;
        optionFrom.textContent = `${currency}`;
        fromCurrency.appendChild(optionFrom);

        const optionTo = document.createElement('option');
        optionTo.value = currency;
        optionTo.textContent = `${currency}`;
        toCurrency.appendChild(optionTo);
    });
}

// Memuat mata uang ketika halaman dimuat
window.onload = loadCurrencies;