function utilitiesPageRoot() {
    return document.getElementById('utilities-page');
}

function utilitiesGetPharmacyId() {
    var root = utilitiesPageRoot();
    if (!root) return '';
    var select = document.getElementById('utilities-pharmacy-select');
    if (select && select.value) return select.value;
    return root.getAttribute('data-own-pharmacy') || '';
}

function utilitiesGetReadingMode(pharmacyId, typeId) {
    var root = utilitiesPageRoot();
    if (!root || !typeId) return 'single';
    var configs = {};
    var typeModes = {};
    try {
        configs = JSON.parse(root.getAttribute('data-meter-configs') || '{}');
        typeModes = JSON.parse(root.getAttribute('data-type-modes') || '{}');
    } catch (e) {
        return 'single';
    }
    if (pharmacyId) {
        var key = pharmacyId + ':' + typeId;
        if (configs[key]) return configs[key];
    }
    return typeModes[typeId] || 'single';
}

function utilitiesFormModeUpdate() {
    var typeSelect = document.getElementById('utilities-type-select');
    var singleWrap = document.getElementById('utilities-single-wrap');
    var dayNightWrap = document.getElementById('utilities-daynight-wrap');
    var hint = document.getElementById('utilities-mode-hint');
    if (!typeSelect || !singleWrap || !dayNightWrap) return;

    var pharmacyId = utilitiesGetPharmacyId();
    var typeId = typeSelect.value;
    var mode = utilitiesGetReadingMode(pharmacyId, typeId);
    var isDayNight = mode === 'day_night';

    singleWrap.style.display = isDayNight ? 'none' : '';
    dayNightWrap.style.display = isDayNight ? '' : 'none';

    var valueInput = singleWrap.querySelector('input[name=value]');
    var dayInput = dayNightWrap.querySelector('input[name=value_day]');
    var nightInput = dayNightWrap.querySelector('input[name=value_night]');
    if (valueInput) valueInput.required = !isDayNight;
    if (dayInput) dayInput.required = isDayNight;
    if (nightInput) nightInput.required = isDayNight;

    if (hint) {
        hint.textContent = isDayNight
            ? 'Лічильник у режимі «день / ніч» — вкажіть обидва показники.'
            : (typeId ? 'Звичайний лічильник — одне показання.' : '');
    }
}

document.addEventListener('DOMContentLoaded', function () {
    document.body.addEventListener('htmx:afterSwap', function (evt) {
        if (document.getElementById('utilities-page')) {
            utilitiesFormModeUpdate();
        }
    });
    if (document.getElementById('utilities-page')) {
        utilitiesFormModeUpdate();
    }
});