$(document).ready(function () {
    loader = $('#overlay, #loader');
    tableName = '#PODataTable';
    totalSelectedLabel = $('#totalSelected');
    tableElement = $(tableName);

    poDataTable = $(tableName).DataTable({
        initComplete: function () {
            var api = this.api();
            var data = api.ajax.json();
            if (!data || !data.data || data.data === "No Data") {
                $('.dataTables_empty').html("No record available");
                toggleSubmitButton();
            }
            calculateTotalPesoAmount();
        },
        columns: colCustomPO,
        columnDefs:colDefCustomPO,
        language: {
            emptyTable: "No items added yet"
        }
    });
});

async function fetchAndPopulatePOFormData(poType, poId = null) {
    loader = $('#overlay, #loader').css('z-index', 1060);

    return new Promise((resolve, reject) => {
        $.ajax({
            url: '/POMgmt/GetPOFormData',
            type: 'GET',
            data: { poId: poId },
            beforeSend: function () {
                loader.show();
            },
            complete: function () {
                loader.hide();
            },
            success: function (response) {
                const d = response;

                document.getElementById("poType").value = poType;
                $('#poNoFinal').val($('#poNo').val());
                // --- Header Fields ---
                if (d.header) {
                    document.getElementById("supplierName").value = d.header.supplierName || '';
               
                    $('#supplierId').val(d.header.supplierId || 0);
                    if (d.header?.deliveryDate) {
                        let deliveryDate = d.header.deliveryDate.split("T")[0];
                        $('#deliveryDate').val(deliveryDate);
                    }

                    if (d.header?.profInvoiceDate) {
                        let profInvoiceDate = d.header.profInvoiceDate.split("T")[0];
                        $('#piDate').val(profInvoiceDate);
                    }

                    $('#deliverTo').val(d.header.deliverTo || '');

                    $('#piNo').val(d.header.profInvoiceNo || '');
                    $('#currencyCER').val(d.header.currencyCER || '59.00');
                    $('#podId').val(d.header.podId || 0);
                    $('#shippingInstructionId').val(1);
                    $('#discount').val(d.header.discount || 0);
                    
                    $('#C-paymentTerms').val(d.header.paymentTerms || '');
                    $('#C-paymentTermsId').val(d.header.paymentTermsId || 0);
                    $('#remarks').val(d.header.remarks || '');
                    $('#grossAmountUSD').val(d.header.grossAmountUSD || 0);                  
               
                    $('#finalAmountUSD').val(d.header.finalAmountUSD || 0);
                    $('#grossAmountPHP').val(d.header.grossAmountPHP || 0);
                    $('#finalAmountPHP').val(d.header.finalAmountPHP || 0);

                    $('#finalAmount').val(d.header.finalAmountPHP || 0);
                    $('#grossAmount').val(d.header.grossAmountPHP || 0);

                    $('#incoTermsId').val(d.header.incoTermsId);
                    $('#incotermsName').val(d.header.incotermsName || '');
                }

                // --- DataTable: Line Items ---
                if (poDataTable) {
                    poDataTable.clear();
                    if (d.lineItems && d.lineItems.length > 0) {
                        poDataTable.rows.add(d.lineItems).draw();
                    }
                }

                // --- DataTable: Charges ---
                if (d.charges && d.charges.length > 0) {
                    const $tbody = $('#DestChargesTable tbody');
                    $tbody.empty();

                    d.charges.forEach(function (charge) {
                        var newRow = '<tr>' +
                            '<td style="display: none;">' + charge.otherChargesId + '</td>' +
                            '<td>' + charge.otherChargesName + '</td>' +
                            '<td>' + charge.amount + '</td>' +
                            '<td><button class="btn btn-default" onclick="removeRow(this)" data-otherChargesId="' + charge.otherChargesId + '">' +
                            '<i class="fa-solid fa-trash fa-xl" style="color: #ff0000;" aria-hidden="true"></i>' +
                            '</button></td>' +
                            '</tr>';
                        $tbody.append(newRow);
                    });
                }

                // --- Docs Required ---
                if (d.docsRequired && d.docsRequired.length > 0) {
                    $('#docRequiredId').val(
                        d.docsRequired.map(x => x.docName).join('\n')
                    );
                }
                resolve();
            },
            error: function (xhr, status, error) {
                console.error("Error loading PO form data:", error);
                reject(error);
            }
        });
    });
}
function enablePONoAutocomplete() {
    
    clearCustomTable();
    document.getElementById('customPOHeading').innerHTML = 'Custom P.O. Modification';
    customFormPOElemComponent(4);
    document.getElementById("poNo").removeAttribute("readonly");
    document.getElementById("poNo").value ='';
    document.getElementById("poNo").focus();
    document.getElementById("poType").value = "0";
    popPONo();
}
function clearCustomTable() {
    poDataTable.clear().draw();
} 
// =====================================================================
// UTILITIES
// =====================================================================

function getGrossFromTable() {
    let gross = 0;

    const table = $('#PODataTable').DataTable();

    table.rows().every(function () {
        const rowNode = this.node();
        const cellText = $(rowNode).find('td').eq(8).text().replace(/,/g, '');
        const val = parseFloat(cellText) || 0;
        gross += val;
    });

    return gross;
}
function getChargesFromTable() {
    let charges = 0;
    $('#DestChargesTable tbody tr').each(function () {
        const val = parseFloat($(this).find('td').eq(2).text().replace(/,/g, '')) || 0;
        charges += val;
    });

    return charges;
}

function getDiscount() {
    return parseFloat($('#discount').val()) || 0;
}

function getPoTypeId() {
    return parseInt($('#poTypeId').val()) || 0;
}


function recalculateAll() {
    const poTypeId = getPoTypeId();
    const grossAmount = getGrossFromTable();      
    const chargesAmount = getChargesFromTable();

    const discount = getDiscount();
    const currencyCER = parseFloat($('#currencyCER').val()) || 1;

    const grossAfterDiscount = grossAmount - parseFloat(discount.toFixed(4));

    if (poTypeId === 3) {

        const finalAmountUSD = grossAfterDiscount + chargesAmount;
        const grossAmountPHP = grossAfterDiscount * currencyCER;
        const finalAmountPHP = finalAmountUSD * currencyCER;


        $('#grossAmountUSD').val(numberWithCommas(grossAfterDiscount.toFixed(4)));
        $('#finalAmountUSD').val(numberWithCommas(finalAmountUSD.toFixed(4)));
        $('#grossAmountPHP').val(numberWithCommas(grossAmountPHP.toFixed(4)));
        $('#finalAmountPHP').val(numberWithCommas(finalAmountPHP.toFixed(4)));

        // Hide PHP-only fields, show USD fields
        $('#grossAmount, #finalAmount').val('');

    } else if (poTypeId === 1 ) {

        const vatRate = parseFloat($('#vatRate').val()) || 0;
        const vatAmount = (vatRate / 100) * grossAfterDiscount;
        const finalAmountPHP = grossAfterDiscount + vatAmount + chargesAmount;

        $('#grossAmount').val(numberWithCommas(grossAfterDiscount.toFixed(4)));
        $('#finalAmount').val(numberWithCommas(finalAmountPHP.toFixed(4)));

        $('#grossAmountUSD, #finalAmountUSD, #grossAmountPHP, #finalAmountPHP').val('');

    } else {

        const finalAmount = grossAfterDiscount + chargesAmount;

        $('#grossAmount').val(numberWithCommas(grossAfterDiscount.toFixed(4)));
        $('#finalAmount').val(numberWithCommas(finalAmount.toFixed(4)));

        $('#grossAmountUSD, #finalAmountUSD, #grossAmountPHP, #finalAmountPHP').val('');
    }
}

// =====================================================================
// ROW-LEVEL: Update TotalAmount cell then trigger recalc
// =====================================================================

function bindTableInputEvents() {
    $(tableName + ' tbody').on('input', '.unitPrice, .qty', function () {
        const $row = $(this).closest('tr');
        const qty = parseFloat($row.find('.qty').eq(0).val()) || 0;
        const price = parseFloat($row.find('.unitPrice').eq(0).val()) || 0;

        $row.find('td').eq(8).text((qty * price).toFixed(4));

        recalculateAll();
    });
}

// =====================================================================
// SECONDARY INPUT TRIGGERS
// =====================================================================

function bindSecondaryInputEvents() {
    // Discount changed → recalculate
    $('#discount').on('input', function () {
        recalculateAll();
    });

    // VAT rate changed → recalculate (only relevant for POTypeId=1)
    $('#vatRate').on('input', function () {
        recalculateAll();
    });

    // Currency exchange rate changed → recalculate (only relevant for POTypeId=3)
    $('#currencyCER').on('input', function () {
        recalculateAll();
    });

    // PO Type changed → recalculate with new logic branch
    $('#poTypeId').on('change', function () {
        recalculateAll();
    });

    // Charges table changes → recalculate
    $('#DestChargesTable').on('input change', function () {
        recalculateAll();
    });
}

// =====================================================================
// INIT — call on page load / form load
// =====================================================================

function initPOCalculations() {
    bindTableInputEvents();
    bindSecondaryInputEvents();
    recalculateAll(); // Populate on load from existing data
}

// ─── Kept for backward compatibility if called elsewhere ────────────
function lessDiscount() { recalculateAll(); }
function calculateFinalPesoAmount() { recalculateAll(); }
function calculateFinalUsdAmount() { recalculateAll(); }
function calculateTotalPesoAmount() { bindTableInputEvents(); }
function calculateTotalUsdAmount() { bindTableInputEvents(); }