(function() {
    var typeSelect = document.getElementById('pc-type');
    var input = document.getElementById('pc-value-input');
    var hidden = document.getElementById('pc-value-hidden');
    function updatePromoInput() {
        if (typeSelect.value === 'fixed') {
            input.step = '0.01';
            input.placeholder = 'e.g. 5.00';
        } else {
            input.step = '1';
            input.placeholder = 'e.g. 50';
        }
        syncValue();
    }
    function syncValue() {
        var val = parseFloat(input.value || 0);
        hidden.value = typeSelect.value === 'fixed' ? Math.round(val * 100) : Math.round(val);
    }
    typeSelect.addEventListener('change', updatePromoInput);
    input.addEventListener('input', syncValue);
    updatePromoInput();
})();