$(document).ready(function () {

    // ----- Endpoints (same domain as the shop so the OCSESSID cookie is sent) -----
    const LURSOFT_LOOKUP_URL = "https://kamigifts.lv/lursoft/l.php";
    const SESSION_SAVE_URL   = "https://kamigifts.lv/lursoft/session_address.php";

    // How long to wait (ms) after the user stops typing before fetching/updating.
    const ADDRESS_DELAY = 1000; // 1 second

    let lookupTimer  = null; // debounce timer for the registry lookup
    let sessionTimer = null; // debounce timer for pushing edits to the session

    // Full mapping of Latvian cities → novads names (matching your <select> options)
    const cityToRegionMap = {
        "Rīga": "Rīga",
        "Liepāja": "Liepāja",
        "Daugavpils": "Daugavpils",
        "Jelgava": "Jelgava",
        "Jūrmala": "Jūrmala",
        "Rēzekne": "Rēzekne",
        "Valmiera": "Valmiera",
        "Ventspils": "Ventspils",
        "Jēkabpils": "Jēkabpils",

        "Ādaži": "Ādažu novads",
        "Ainaži": "Ainaži, Salacgrīvas novads",
        "Aizkraukle": "Aizkraukles novads",
        "Aizpute": "Aizputes novads",
        "Aknīste": "Aknīstes novads",
        "Aloja": "Aloja, Alojas novads",
        "Alsunga": "Alsungas novads",
        "Alūksne": "Alūksne, Alūksnes novads",
        "Amata": "Amatas novads",
        "Ape": "Ape, Apes novads",
        "Auce": "Auces novads",
        "Babīte": "Babītes novads",
        "Baldone": "Baldone, Baldones novads",
        "Baltinava": "Baltinavas novads",
        "Balvi": "Balvi, Balvu novads",
        "Bauska": "Bauska, Bauskas novads",
        "Brocēni": "Brocēni, Brocēnu novads",
        "Burtnieki": "Burtnieku novads",
        "Carnikava": "Carnikavas novads",
        "Cēsis": "Cēsis, Cēsu novads",
        "Cesvaine": "Cesvaine, Cesvaines novads",
        "Cibla": "Ciblas novads",
        "Dagda": "Dagda, Dagdas novads",
        "Dobele": "Dobele, Dobeles novads",
        "Dundaga": "Dundagas novads",
        "Durbe": "Durbe, Durbes novads",
        "Engure": "Engures novads",
        "Ērgļi": "Ērgļu novads",
        "Garkalne": "Garkalnes novads",
        "Grobiņa": "Grobiņa, Grobiņas novads",
        "Gulbene": "Gulbene, Gulbenes novads",
        "Iecava": "Iecavas novads",
        "Ikšķile": "Ikšķile, Ikšķiles novads",
        "Ilūkste": "Ilūkste, Ilūkstes novads",
        "Inčukalne": "Inčukalna novads",
        "Jaunjelgava": "Jaunjelgava, Jaunjelgavas novads",
        "Jaunpiebalga": "Jaunpiebalgas novads",
        "Jaunpils": "Jaunpils novads",
        "Ķekava": "Ķekavas novads",
        "Kandava": "Kandava, Kandavas novads",
        "Kārsava": "Kārsava, Kārsavas novads",
        "Krāslava": "Krāslava, Krāslavas novads",
        "Krustpils": "Krustpils novads",
        "Kuldīga": "Kuldīga, Kuldīgas novads",
        "Lielvārde": "Lielvārde, Lielvārdes novads",
        "Līgatne": "Līgatne, Līgatnes novads",
        "Limbaži": "Limbaži, Limbažu novads",
        "Līvāni": "Līvāni, Līvānu novads",
        "Lubāna": "Lubāna, Lubānas novads",
        "Ludza": "Ludza, Ludzas novads",
        "Madona": "Madona, Madonas novads",
        "Mālpils": "Mālpils novads",
        "Mārupe": "Mārupes novads",
        "Mazsalaca": "Mazsalaca, Mazsalacas novads",
        "Mērsrags": "Mērsraga novads",
        "Naukšēni": "Naukšēnu novads",
        "Nereta": "Neretas novads",
        "Nīca": "Nīcas novads",
        "Ogre": "Ogre, Ogres novads",
        "Olaine": "Olaine, Olaines novads",
        "Ozolnieki": "Ozolnieku novads",
        "Pārgauja": "Pārgaujas novads",
        "Pāvilosta": "Pāvilosta, Pāvilostas novads",
        "Piltene": "Piltene, Ventspils novads",
        "Pļaviņas": "Pļaviņas, Pļaviņu novads",
        "Preiļi": "Preiļi, Preiļu novads",
        "Priekule": "Priekule, Priekules novads",
        "Priekuļi": "Priekuļu novads",
        "Rauna": "Raunas novads",
        "Riebiņi": "Riebiņu novads",
        "Roja": "Rojas novads",
        "Ropaži": "Ropažu novads",
        "Rucava": "Rucavas novads",
        "Rugāji": "Rugāju novads",
        "Rūjiena": "Rūjiena, Rūjienas novads",
        "Rundāle": "Rundāles novads",
        "Salacgrīva": "Salacgrīva, Salacgrīvas novads",
        "Sala": "Salas novads",
        "Salaspils": "Salaspils, Salaspils novads",
        "Saldus": "Saldus, Saldus novads",
        "Saulkrasti": "Saulkrasti, Saulkrastu novads",
        "Sēja": "Sējas novads",
        "Sigulda": "Sigulda, Siguldas novads",
        "Skrīveri": "Skrīveru novads",
        "Skrunda": "Skrunda, Skrundas novads",
        "Smiltene": "Smiltene, Smiltenes novads",
        "Stopiņi": "Stopiņu novads",
        "Strenči": "Strenči, Strenču novads",
        "Talsi": "Talsi, Talsu novads",
        "Tērvete": "Tērvetes novads",
        "Tukums": "Tukums, Tukuma novads",
        "Valdemārpils": "Sabile, Talsu novads", // matches select option
        "Valka": "Valka, Valkas novads",
        "Vārkava": "Vārkavas novads",
        "Vecpiebalga": "Vecpiebalgas novads",
        "Vecumnieki": "Vecumnieku novads",
        "Viesīte": "Viesīte, Viesītes novads",
        "Viļaka": "Viļaka, Viļakas novads",
        "Viļāni": "Viļāni, Viļānu novads",
        "Zilupe": "Zilupe, Zilupes novads"
    };

    function clearAllFields() {
        $('#customer_comp_name, #customer_pvn_nr, #payment_address_address_1, #payment_address_city, #payment_address_postcode').val('');
        $('#payment_address_zone_id').prop('selectedIndex', 0);
    }

    function selectRegion(region, city) {
        const $select = $('#payment_address_zone_id');

        if (region) {
            // Direct region select
            const opt = $select.find('option').filter(function () {
                return $(this).text().trim() === region;
            });
            if (opt.length) {
                opt.prop('selected', true);
                return;
            }
        }

        // Fallback by city
        const regionName = cityToRegionMap[city];
        if (regionName) {
            const opt = $select.find('option').filter(function () {
                return $(this).text().trim() === regionName;
            });
            if (opt.length) {
                opt.prop('selected', true);
            }
        }
    }

    // Collect the current address values shown in the form.
    function collectAddress() {
        return {
            company:            $('#customer_comp_name').val() || '',
            vat:                $('#customer_pvn_nr').val() || '',
            city:               $('#payment_address_city').val() || '',
            address_1:          $('#payment_address_address_1').val() || '',
            postcode:           $('#payment_address_postcode').val() || '',
            zone_id:            $('#payment_address_zone_id').val() || '',
            zone:               $('#payment_address_zone_id option:selected').text().trim() || '',
            shipping_city:      $('#shipping_address_city').val() || '',
            shipping_address_1: $('#shipping_address_address_1').val() || '',
            shipping_postcode:  $('#shipping_address_postcode').val() || '',
            shipping_zone_id:   $('#shipping_address_zone_id').val() || '',
            shipping_zone:      $('#shipping_address_zone_id option:selected').text().trim() || ''
        };
    }

    // Push the current address into the OpenCart session (debounced, immediate=true
    // skips the debounce when we've just filled the form from a lookup).
    function updateSession(immediate) {
        clearTimeout(sessionTimer);
        const send = function () {
            $.ajax({
                url: SESSION_SAVE_URL,
                type: "POST",
                data: collectAddress(),
                dataType: "json",
                xhrFields: { withCredentials: true }, // send the OCSESSID cookie
                error: function (xhr, status, err) {
                    console.error(
                        "Could not update session address.",
                        "status:", xhr && xhr.status,
                        "textStatus:", status,
                        "error:", err,
                        "response:", xhr && xhr.responseText
                    );
                }
            });
        };
        if (immediate) {
            send();
        } else {
            sessionTimer = setTimeout(send, 400);
        }
    }

    // Fetch company data by registry number, fill the form, then sync the session.
    function doLookup(regNumber) {
        $.ajax({
            url: LURSOFT_LOOKUP_URL,
            type: "GET",
            data: { reg: regNumber },
            dataType: "json",
            xhrFields: { withCredentials: true },
            success: function (res) {
                const c = res && res.company ? res.company : {};

                const company_name = (c.company_name || "").toString();
                const vat          = (c.vat || "").toString();
                const city         = (c.city || "").toString();
                const address      = (c.address || "").toString();
                const zip          = (c.zip || "").toString();
                const region       = (c.region || "").toString();

                $('#customer_comp_name').val(company_name);
                $('#customer_pvn_nr').val(vat);
                $('#payment_address_city').val(city);
                $('#payment_address_address_1').val(address);
                $('#payment_address_postcode').val(zip);

                selectRegion(region, city);

                // Push the freshly filled address straight into the session.
                updateSession(true);
            },
            error: function () {
                clearAllFields();
                console.error("Could not fetch company data.");
            }
        });
    }

    // Named handler for #customer_reg_nr so it can be unbound/rebound by reference
    // (you can't reliably .off() an anonymous function).
    function regHandler() {
        const regNumber = $(this).val();

        clearTimeout(lookupTimer); // reset the timer on every keystroke

        if (regNumber.length !== 11) {
            clearAllFields();
            updateSession(true); // reflect the cleared address in the session
            return;
        }

        // Wait 1 second after the user stops typing, then look up + fill.
        lookupTimer = setTimeout(function () {
            doLookup(regNumber);
        }, ADDRESS_DELAY);
    }

    // Capture-phase listener on document. It fires BEFORE any handler the
    // checkout binds to #customer_reg_nr (inline onchange, direct, or delegated)
    // and works even if the checkout re-renders the field. stopImmediatePropagation
    // suppresses the built-in handler so ONLY our l.php lookup runs.
    function regCaptureListener(e) {
        var t = e.target;
        if (!t || t.id !== 'customer_reg_nr') {
            return;
        }
        e.stopImmediatePropagation(); // turn off the default handler for this event
        regHandler.call(t);           // run our own (this = the input element)
    }

    function bindRegHandler() {
        // capture = true. addEventListener ignores duplicate (fn + capture) pairs,
        // so calling this more than once is safe.
        document.addEventListener('change', regCaptureListener, true);
        document.addEventListener('keyup', regCaptureListener, true);
    }

    function unbindRegHandler() {
        document.removeEventListener('change', regCaptureListener, true);
        document.removeEventListener('keyup', regCaptureListener, true);
    }

    // Bind immediately on load so the default handler is overridden from the start
    // (don't wait for the 1s timer below).
    bindRegHandler();

    setTimeout(function () {
        $('#customer_reg_nr').removeAttr('data-onchange');

        // Remove inline "onchange" attribute
        $('#customer_reg_nr').removeAttr('onchange');

        // Remove jQuery or JS event listeners bound to "change"
        $('#customer_reg_nr').off('change');

        // Also remove native DOM onchange handlers if set directly
        document.getElementById('customer_reg_nr').onchange = null;

        $('#shipping_address_copy_jur').removeAttr('data-onchange');
        // Remove inline "onchange" attribute
        $('#shipping_address_copy_jur').removeAttr('onchange');

        // Remove jQuery or JS event listeners bound to "change"
        $('#shipping_address_copy_jur').off('change');

        // Also remove native DOM onchange handlers if set directly
        document.getElementById('shipping_address_copy_jur').onchange = null;

        $('#shipping_address_copy_jur').off('change keyup');

        // Remove previous handlers
        $('#customer_reg_nr').off('change keyup');

        $('#shipping_address_copy_jur').on('click', function () {
            if ($(this).is(':checked')) {
                $('#shipping_address_city').val($('#payment_address_city').val());
                $('#shipping_address_postcode').val($('#payment_address_postcode').val());
                $('#shipping_address_address_1').val($('#payment_address_address_1').val());
                var selectedZone = $('#payment_address_zone_id').val();
                $('#shipping_address_zone_id').val(selectedZone).trigger('change');
            } else {
                // Was checked, now unchecked → clear all shipping fields,
                // including resetting the zone <select> to its first option.
                $('#shipping_address_city').val('');
                $('#shipping_address_address_1').val('');
                $('#shipping_address_postcode').val('');
                $('#shipping_address_zone_id').prop('selectedIndex', 0).trigger('change');

                // Unbind the #customer_reg_nr change handler, wait 3 seconds,
                // then bind it once again.
                unbindRegHandler();
                setTimeout(bindRegHandler, 3000);
            }
            // Keep the session in sync with the copied/cleared shipping address.
            updateSession(true);
        });

        // Attach handler — now with a 1 second delay before updating the address.
        bindRegHandler();

        // If the user edits any address field by hand, keep the session updated.
        $('#customer_comp_name, #customer_pvn_nr, ' +
          '#payment_address_address_1, #payment_address_city, #payment_address_postcode, #payment_address_zone_id, ' +
          '#shipping_address_address_1, #shipping_address_city, #shipping_address_postcode, #shipping_address_zone_id')
            .on('change keyup', function () {
                updateSession(false);
            });

    }, 1000);

    setTimeout(function () {
        if ($(this).is(':checked')) {
            $('#shipping_address_city').val($('#payment_address_city').val());
            $('#shipping_address_postcode').val($('#payment_address_postcode').val());
            $('#shipping_address_address_1').val($('#payment_address_address_1').val());
            var selectedZone = $('#payment_address_zone_id').val();
            $('#shipping_address_zone_id').val(selectedZone).trigger('change');
        } else {
            // Optional: clear fields when unchecked
            $('#shipping_address_city, #shipping_address_postcode, #shipping_address_address_1').val('');
            $('#shipping_address_zone_id').val('').trigger('change');
        }
    }, 2000);

});