{# templates/sales/ticket_refund.html #}
{% extends "pos/base.html" %}
{% load static %}
{% block title %}Ticket Refund Invoice{% endblock %}

{% block stylesheets %}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.13/flatpickr.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css">
<style>
:root{
  --rb:#01478f;--rbl:#1565c0;--rg:#28a745;--rr:#dc3545;
  --rgold:#c69c00;--rgoldbg:#fdf6d8;--rbdr:#bfc5ce;
  --rh:#e8ecf1;--rl:#f0f1f3;--ih:26px;--fs:0.75rem;--fsm:0.68rem;--fl:0.62rem;
}
*{box-sizing:border-box}
body{overflow:hidden}
.rf-page{height:calc(100vh - 48px);display:flex;flex-direction:column;background:var(--rl);padding:4px 6px;overflow:hidden;font-size:var(--fs)}
.rf-page input,.rf-page select{height:var(--ih);font-size:var(--fs);padding:1px 5px;border:1px solid var(--rbdr);border-radius:2px;background:#fff;outline:none}
.rf-page input:focus,.rf-page select:focus{border-color:var(--rb);box-shadow:0 0 0 1px rgba(1,71,143,.15)}
.rf-page label{font-size:var(--fl);font-weight:600;color:#555;text-transform:uppercase;margin:0;white-space:nowrap}
.rf-ro{background:var(--rgoldbg)!important;font-weight:700;color:#333}
/* TITLE */
.rf-titlebar{background:linear-gradient(135deg,var(--rb),var(--rbl));color:#fff;padding:4px 10px;border-radius:3px 3px 0 0;font-weight:700;font-size:.82rem;display:flex;justify-content:space-between;align-items:center;flex-shrink:0}
.rf-nav{display:flex;gap:3px}
.rf-nav .btn{width:26px;height:26px;padding:0;font-size:11px;border-radius:2px;display:flex;align-items:center;justify-content:center}
/* SEARCH BAR */
.rf-search{background:var(--rh);border:1px solid var(--rbdr);border-top:none;padding:5px 10px;flex-shrink:0;display:flex;gap:6px;align-items:flex-end;flex-wrap:wrap}
.rf-search .rf-fd{display:flex;flex-direction:column}
/* CONTENT */
.rf-content{flex:1;overflow-y:auto;padding:4px 0;display:flex;flex-direction:column;gap:4px}
/* INVOICE INFO BAR */
.rf-inv-bar{background:#fff;border:1px solid var(--rbdr);border-radius:2px;padding:5px 10px;display:flex;gap:12px;align-items:center;flex-shrink:0;flex-wrap:wrap}
.rf-inv-badge{background:var(--rb);color:#fff;font-size:var(--fl);font-weight:700;padding:2px 8px;border-radius:2px}
.rf-inv-detail{font-size:var(--fsm);color:#555}
.rf-inv-detail strong{color:#222}
/* HEADER ROW */
.rf-hdr-row{background:var(--rh);border:1px solid var(--rbdr);border-radius:2px;padding:5px 10px;display:flex;gap:10px;align-items:flex-end;flex-shrink:0;flex-wrap:wrap}
.rf-fd{display:flex;flex-direction:column}
/* SECTION HEADERS */
.rf-sec-head{background:var(--rb);color:#fff;padding:3px 8px;font-size:var(--fsm);font-weight:700;border-radius:2px 2px 0 0;display:flex;justify-content:space-between;align-items:center}
.rf-sec-body{background:#fff;border:1px solid var(--rbdr);border-top:none;border-radius:0 0 2px 2px;padding:5px 8px}
/* TICKET REFUND CARD */
.rf-ticket-card{background:#fff;border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0}
.rf-ticket-head{background:var(--rh);padding:4px 8px;display:flex;gap:8px;align-items:center;border-bottom:1px solid var(--rbdr);flex-wrap:wrap}
.rf-tkt-badge{background:var(--rb);color:#fff;font-size:var(--fl);font-weight:700;padding:1px 6px;border-radius:2px}
.rf-ticket-body{padding:5px 8px}
.rf-deductions{display:flex;gap:5px;flex-wrap:wrap;align-items:flex-end}
.rf-deductions .rf-fd input{width:100%}
.rf-outputs{display:flex;gap:8px;align-items:center;margin-top:5px;padding:4px 8px;background:var(--rgoldbg);border-radius:2px}
.rf-outputs .rf-fd input{width:110px;text-align:right;font-weight:700}
.rf-out-rfnd input{background:#d4edda!important;color:#155724}
.rf-out-pay input{background:#f8d7da!important;color:#721c24}
.rf-out-psf input{background:#fff3cd!important;color:#856404}
/* CHECKBOX TOGGLE */
.rf-tkt-skip-chk{display:flex;align-items:center;gap:4px;margin-left:auto}
.rf-tkt-skip-chk input{width:14px;height:14px}
.rf-tkt-skip-chk label{font-size:var(--fl);text-transform:none;color:#dc3545;font-weight:700}
/* SERVICE REFUND ROWS */
.rf-svc-row{display:flex;gap:6px;align-items:center;padding:4px 6px;background:#f8f9fa;border-radius:2px;margin-bottom:3px;flex-wrap:wrap}
.rf-svc-row input{height:var(--ih);font-size:var(--fsm);padding:1px 5px;border:1px solid var(--rbdr);border-radius:2px;background:#fff}
.rf-svc-row .rf-ro{background:var(--rgoldbg)!important}
.rf-svc-lbl{font-size:var(--fl);font-weight:700;color:var(--rb);flex:0 0 140px}
.rf-svc-refund-out input{background:#f8d7da!important;color:#721c24;font-weight:700}
/* SEGMENT REFUND */
.rf-seg-row{display:flex;gap:6px;align-items:center;margin-bottom:4px;padding:4px 6px;background:#f8f9fa;border-radius:2px}
.rf-seg-row input{height:var(--ih);font-size:var(--fsm);padding:1px 5px;border:1px solid var(--rbdr);border-radius:2px;background:#fff}
.rf-seg-row .rf-ro{background:var(--rgoldbg)!important}
/* TOTALS STRIP */
.rf-totals{display:flex;gap:6px;align-items:center;background:var(--rh);border:1px solid var(--rbdr);border-radius:2px;padding:5px 10px;flex-shrink:0;flex-wrap:wrap}
.rf-totals .rf-fd input{width:100px;text-align:right;font-weight:700}
.rf-tot-grand input{background:var(--rb)!important;color:#fff!important;font-weight:700;border:none!important}
.rf-tot-rfnd input{background:#d4edda;font-weight:700}
.rf-tot-pay input{background:#f8d7da;font-weight:700}
/* RIGHT PANEL */
.rf-body{flex:1;display:flex;gap:4px;min-height:0;overflow:hidden;margin-top:4px}
.rf-body-left{flex:1;display:flex;flex-direction:column;min-height:0;overflow-y:auto;gap:4px}
.rf-body-right{flex:0 0 170px;display:flex;flex-direction:column;gap:4px}
.rf-actions{background:#fff;border:1px solid var(--rbdr);border-radius:2px;padding:6px;display:flex;flex-direction:column;gap:4px}
.rf-actions .btn{width:100%;font-size:var(--fs);font-weight:700;padding:5px 8px;border-radius:2px}
.rf-bank-panel{background:#fff;border:1px solid var(--rbdr);border-radius:2px;padding:6px}
.rf-bank-panel h6{font-size:var(--fsm);font-weight:700;color:var(--rb);margin:0 0 4px 0}
.rf-bank-row{display:flex;gap:3px;margin-bottom:3px;align-items:center}
.rf-bank-row select{flex:1;font-size:var(--fsm)}
.rf-bank-row input{width:70px;font-size:var(--fsm);text-align:right}
.rf-bank-row .bx{width:20px;height:20px;padding:0;border:none;border-radius:2px;background:var(--rr);color:#fff;font-size:10px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.rf-bank-total{text-align:right;font-size:var(--fsm);font-weight:700;color:var(--rb);margin-top:3px;padding-top:3px;border-top:1px solid #ddd}
/* SEARCH RESULTS */
.rf-results{background:#fff;border:1px solid var(--rbdr);border-radius:2px;max-height:220px;overflow-y:auto;display:none}
.rf-results.show{display:block}
.rf-result-row{padding:6px 10px;border-bottom:1px solid #eee;cursor:pointer;font-size:var(--fsm)}
.rf-result-row:hover{background:#f0f7ff}
.rf-result-row .inv-no{font-weight:700;color:var(--rb)}
/* LOADING */
.rf-loading{position:fixed;inset:0;background:rgba(255,255,255,.8);display:flex;align-items:center;justify-content:center;z-index:9999}
.rf-loading.h{display:none}
/* SELECT2 */
.select2-container--default .select2-selection--single{height:var(--ih)!important;min-height:var(--ih)!important;border:1px solid var(--rbdr);border-radius:2px;font-size:var(--fs)}
.select2-container--default .select2-selection--single .select2-selection__rendered{line-height:calc(var(--ih) - 2px);padding-left:5px;font-size:var(--fs)}
.select2-container--default .select2-selection--single .select2-selection__arrow{height:calc(var(--ih) - 2px)}
.flatpickr-input{cursor:pointer!important}
.flatpickr-calendar{font-size:.78rem}
.rf-skip-label{font-size:var(--fl);color:#dc3545;background:#f8d7da;padding:2px 6px;border-radius:2px;margin-left:4px}
</style>
{% endblock %}

{% block content %}
<div class="rf-loading h" id="loadOvl"><div class="spinner-border text-primary"></div></div>

<div class="rf-page">

  <!-- TITLE BAR -->
  <div class="rf-titlebar">
    <span><i class="fas fa-undo-alt mr-2"></i>Ticket Refund Invoice</span>
    <div class="rf-nav">
      <a href="{% url 'ticket:ticket_list' %}"   class="btn btn-sm btn-warning ml-1" title="Invoice List"><i class="fas fa-list"></i></a>
      <a href="{% url 'ticket:refund_list' %}"   class="btn btn-sm btn-outline-light ml-1" title="Refund List"><i class="fas fa-undo"></i></a>
      <a href="{% url 'ticket:ticket_refund' %}" class="btn btn-sm btn-light ml-1" title="New Refund"><i class="fas fa-plus"></i></a>
      <a href="/"                                class="btn btn-sm btn-light ml-1" title="Home"><i class="fas fa-home"></i></a>
    </div>
  </div>

  <!-- SEARCH BAR -->
  <div class="rf-search" id="searchBar">
    <div class="rf-fd">
      <label>Invoice#</label>
      <input type="text" id="srch_inv" style="width:80px;" placeholder="e.g. 12">
    </div>
    <div class="rf-fd">
      <label>Ticket#</label>
      <input type="text" id="srch_ticket" style="width:150px;" placeholder="e.g. 673-4004-478545">
    </div>
    <div class="rf-fd">
      <label>PNR</label>
      <input type="text" id="srch_pnr" style="width:100px;" placeholder="e.g. 2FFWKN">
    </div>
    <div class="rf-fd">
      <label>Client</label>
      <input type="text" id="srch_client" style="width:140px;" placeholder="Client name...">
    </div>
    <button class="btn btn-primary btn-sm" id="btnSearch" style="height:var(--ih);"><i class="fas fa-search mr-1"></i>Search</button>
    <span id="srchStatus" style="font-size:var(--fsm);color:#888;align-self:center;"></span>
  </div>

  <!-- SEARCH RESULTS DROPDOWN -->
  <div class="rf-results" id="searchResults"></div>

  <!-- MAIN BODY (hidden until invoice loaded) -->
  <div class="rf-body" id="mainBody" style="display:none;">
    <div class="rf-body-left" id="bodyLeft">

      <!-- INVOICE INFO BAR -->
      <div class="rf-inv-bar" id="invInfoBar"></div>

      <!-- HEADER ROW -->
      <div class="rf-hdr-row">
        <div class="rf-fd"><label>Refund Folder#</label><input type="text" id="rfnd_folder_no" style="width:80px;" class="rf-ro" readonly></div>
        <div class="rf-fd"><label>Refund Date *</label><input type="text" id="rfnd_date" style="width:110px;" class="ti-datepicker" placeholder="DD/MM/YYYY" id-nav="rfnd_date"></div>
        <div class="rf-fd"><label>Receipt#</label><input type="text" id="rfnd_receipt" style="width:70px;" class="rf-ro" readonly></div>
        <div class="rf-fd"><label>Original Inv#</label><input type="text" id="orig_folder_no" style="width:75px;" class="rf-ro" readonly></div>
        <div class="rf-fd"><label>Client</label><input type="text" id="rfnd_client" style="width:200px;" class="rf-ro" readonly></div>
        <input type="hidden" id="rfnd_client_id" value="0">
        <input type="hidden" id="original_folder_no_hid" value="0">
      </div>

      <!-- ═══ TICKET REFUND CARDS ═══ -->
      <div id="ticketCards"></div>

      <!-- ═══ VISA REFUND SECTION ═══ -->
      <div id="visaRefundSection"></div>

      <!-- ═══ HOTEL REFUND SECTION ═══ -->
      <div id="hotelRefundSection"></div>

      <!-- ═══ TRANSPORT REFUND SECTION ═══ -->
      <div id="transportRefundSection"></div>

      <!-- ═══ INSURANCE REFUND SECTION ═══ -->
      <div id="insuranceRefundSection"></div>

      <!-- ═══ SEGMENT REFUND SECTION ═══ -->
      <div id="segmentSection"></div>

      <!-- TOTALS -->
      <div class="rf-totals">
        <div class="rf-fd rf-tot-rfnd"><label>Refund fr.Airline</label><input type="text" id="tot_rfnd_airline" value="0.00" readonly></div>
        <div class="rf-fd rf-tot-pay"><label>Pay to Client</label><input type="text" id="tot_pay_client" value="0.00" readonly></div>
        <div class="rf-fd" style="background:#fff3cd;border-radius:2px;padding:2px 4px;"><label style="color:#856404;">PSF Income</label><input type="text" id="tot_psf_income" value="0.00" readonly style="background:#fff3cd;font-weight:700;color:#856404;"></div>
        <div class="rf-fd"><label>Svc Refund</label><input type="text" id="tot_svc_refund" value="0.00" readonly class="rf-ro"></div>
        <div class="rf-fd"><label>Seg.Reversal</label><input type="text" id="tot_seg_reversal" value="0.00" readonly class="rf-ro"></div>
        <div class="rf-fd rf-tot-grand"><label>Grand Total</label><input type="text" id="tot_grand" value="0.00" readonly></div>
        <div class="rf-fd" style="background:#fff3f3;border-radius:2px;padding:2px 4px;"><label style="color:#dc3545;">Bal.Due Client</label><input type="text" id="tot_balance_due" value="0.00" readonly style="background:#fff3f3;font-weight:700;color:#dc3545;"></div>
      </div>

      <!-- AUDIT -->
      <div style="display:flex;gap:10px;font-size:var(--fsm);color:#888;padding:2px 6px;flex-shrink:0;">
        <span>Created By: <strong id="rfnd_created_by"></strong></span>
        <span>Edited By: <strong id="rfnd_edited_by"></strong></span>
      </div>

    </div><!-- /.rf-body-left -->

    <!-- RIGHT PANEL -->
    <div class="rf-body-right">
      <div class="rf-actions">
        <button class="btn btn-success" id="btnSave"><i class="fas fa-save mr-1"></i>Save</button>
        <button class="btn btn-primary" id="btnUpdate" style="display:none;"><i class="fas fa-edit mr-1"></i>Update</button>
        <button class="btn btn-danger"  id="btnDelete" style="display:none;"><i class="fas fa-trash mr-1"></i>Delete</button>
        <button class="btn btn-outline-secondary btn-sm" id="btnPrint" style="display:none;"><i class="fas fa-print mr-1"></i>Print</button>
        <a href="{% url 'ticket:refund_list' %}" class="btn btn-outline-primary btn-sm mt-1">
          <i class="fas fa-list mr-1"></i>All Refunds
        </a>
      </div>

      <div class="rf-bank-panel" id="bankPanel">
        <h6><i class="fas fa-university mr-1"></i>Cash Paid to Client
          <button class="btn btn-sm btn-outline-primary float-right" style="font-size:9px;padding:1px 5px;" id="btnAddBank"><i class="fas fa-plus"></i></button>
        </h6>
        <div id="bankRows"></div>
        <div class="rf-bank-total">Paid: <span id="bankTotal">0.00</span></div>
      </div>
    </div>
  </div><!-- /.rf-body -->

</div><!-- /.rf-page -->
{% endblock %}

{% block javascripts %}
<script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.6.13/flatpickr.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js"></script>
<script>
(function(){
'use strict';

var API = {
  search: "{% url 'ticket:api_refund_search' %}",
  save:   "{% url 'ticket:api_refund_save' %}",
  list:   "{% url 'ticket:api_refund_list' %}"
  {% if folder_no %}
  ,get:  "{% url 'ticket:api_refund_get' folder_no %}",
  del:  "{% url 'ticket:api_refund_delete' folder_no %}"
  {% endif %}
};
var isEdit  = {{ is_edit_mode|yesno:"true,false" }};
var editFN  = {{ folder_no|default:0 }};
var BANKS   = [{% for b in bank_accounts %}{id:{{ b.t_id }},name:"{{ b.name|escapejs }}"},{% endfor %}];
var csrf    = '{{ csrf_token }}';
var TODAY   = '{{ today }}';

// ── State ─────────────────────────────────────────────────────────
var currentInvoice   = null;
var refundLines      = [];   // per-ticket refund data
var visaRefundLines  = [];   // per-visa refund data
var hotelRefundLines = [];   // per-hotel refund data
var transRefundLines = [];   // per-transport refund data
var insRefundLines   = [];   // per-insurance refund data
var segmentLines     = [];   // per-segment refund data

// ── UTILS ─────────────────────────────────────────────────────────
function sL(){$('#loadOvl').removeClass('h');}
function hL(){$('#loadOvl').addClass('h');}
function fmt(n){return Number(n||0).toLocaleString(undefined,{minimumFractionDigits:2,maximumFractionDigits:2});}
function esc(s){return String(s||'').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');}

function initFP(){
  document.querySelectorAll('.ti-datepicker').forEach(function(el){
    flatpickr(el,{dateFormat:"d/m/Y",allowInput:true,disableMobile:true});
  });
}
function fpISO(id){
  var el=document.getElementById(id); if(!el)return'';
  var fp=el._flatpickr;
  if(fp&&fp.selectedDates&&fp.selectedDates[0]){
    var d=fp.selectedDates[0];
    return d.getFullYear()+'-'+String(d.getMonth()+1).padStart(2,'0')+'-'+String(d.getDate()).padStart(2,'0');
  }
  var v=el.value||'',p=v.split('/');
  return p.length===3?p[2]+'-'+p[1]+'-'+p[0]:v;
}
function fpSet(id,iso){
  var el=document.getElementById(id); if(!el)return;
  if(!iso){el.value='';if(el._flatpickr)el._flatpickr.clear();return;}
  var p=iso.split('-');
  if(p.length!==3)return;
  var disp=p[2]+'/'+p[1]+'/'+p[0];
  el.value=disp;
  if(el._flatpickr)el._flatpickr.setDate(disp,false,"d/m/Y");
}

// ── SEARCH ────────────────────────────────────────────────────────
function doSearch(){
  var inv    = $('#srch_inv').val().trim();
  var tno    = $('#srch_ticket').val().trim();
  var pnr    = $('#srch_pnr').val().trim();
  var client = $('#srch_client').val().trim();
  if(!inv&&!tno&&!pnr&&!client){Swal.fire('Search','Enter Invoice#, Ticket#, PNR, or Client.','info');return;}
  sL();
  $('#srchStatus').text('Searching...');
  $.getJSON(API.search, {invoice_no:inv, ticket_no:tno, pnr:pnr, client:client}).done(function(r){
    hL();
    if(!r.ok){$('#srchStatus').text(r.error||'Error');return;}
    if(!r.results||!r.results.length){
      $('#srchStatus').text('No matching ISSUED invoices found.');
      $('#searchResults').removeClass('show').html('');
      return;
    }
    $('#srchStatus').text(r.count+' invoice(s) found — click to select');
    renderSearchResults(r.results);
  }).fail(function(){hL();$('#srchStatus').text('Network error.');});
}

function renderSearchResults(results){
  var h='';
  results.forEach(function(inv){
    var tktList = (inv.ticket_lines||[]).map(function(tl){
      return '<span style="font-weight:700;color:var(--rb);">'+esc(tl.ticket_no)+'</span>'+(tl.pnr?' ('+esc(tl.pnr)+')':'');
    }).join(', ');
    var extras = [];
    if((inv.visa_lines||[]).length)      extras.push(inv.visa_lines.length+' Visa');
    if((inv.hotel_lines||[]).length)     extras.push(inv.hotel_lines.length+' Hotel');
    if((inv.transport_lines||[]).length) extras.push(inv.transport_lines.length+' Transport');
    if((inv.insurance_lines||[]).length) extras.push(inv.insurance_lines.length+' Insurance');
    h+='<div class="rf-result-row" data-fn="'+inv.folder_no+'">' +
      '<span class="inv-no">Invoice #'+inv.folder_no+'</span> &nbsp;' +
      '<span style="color:#888;">'+inv.invoice_date+'</span> &nbsp;' +
      '<strong>'+esc(inv.client_name)+'</strong> &nbsp;' +
      '<span style="font-size:var(--fl);">'+tktList+'</span>' +
      (extras.length?'<span style="font-size:var(--fl);color:#6f42c1;margin-left:8px;">+'+extras.join(', ')+'</span>':'')+
      '</div>';
  });
  $('#searchResults').html(h).addClass('show');
  window._searchResults = results;
}

$(document).on('click','.rf-result-row',function(){
  var fn = parseInt($(this).data('fn'));
  var inv = (window._searchResults||[]).find(function(x){return x.folder_no===fn;});
  if(!inv) return;
  $('#searchResults').removeClass('show').html('');
  $('#srchStatus').text('');
  loadOriginalInvoice(inv);
});

$('#btnSearch').on('click', doSearch);
$('#srch_inv,#srch_ticket,#srch_pnr,#srch_client').on('keydown',function(e){if(e.key==='Enter')doSearch();});

// Tab between search inputs
var SEARCH_NAV = ['srch_inv','srch_ticket','srch_pnr','srch_client'];
$('#searchBar').on('keydown','input',function(e){
  if(e.key!=='Enter')return;
  var id=$(this).attr('id'), idx=SEARCH_NAV.indexOf(id);
  if(idx>=0 && idx<SEARCH_NAV.length-1){
    e.preventDefault(); e.stopPropagation();
    $('#'+SEARCH_NAV[idx+1]).focus().select();
  }
});

// ── LOAD ORIGINAL INVOICE ─────────────────────────────────────────
function loadOriginalInvoice(inv){
  currentInvoice = inv;

  $('#invInfoBar').html(
    '<span class="rf-inv-badge">Orig. Inv #'+inv.folder_no+'</span>' +
    '<span class="rf-inv-detail">Date: <strong>'+inv.invoice_date+'</strong></span>' +
    '<span class="rf-inv-detail">Category: <strong>'+(inv.inv_category||'—')+'</strong></span>' +
    '<span class="rf-inv-detail">Client: <strong>'+esc(inv.client_name)+'</strong></span>' +
    '<span class="rf-inv-detail">Grand Total: <strong>PKR '+fmt(inv.grand_total)+'</strong></span>'
  );

  fpSet('rfnd_date', TODAY);
  $('#orig_folder_no').val(inv.folder_no);
  $('#original_folder_no_hid').val(inv.folder_no);
  $('#rfnd_client').val(inv.client_name);
  $('#rfnd_client_id').val(inv.client_id);
  $('#rfnd_folder_no').val('(auto)');
  $('#rfnd_receipt').val('(auto)');

  // Build refund line arrays
  refundLines = (inv.ticket_lines||[]).map(function(tl){
    return Object.assign({},tl,{
      _skip:false, sector:'', used_fare:0, no_show_srvc:0, canx_chrgs:0,
      commission: tl.tot_commission||0,
      other_taxes:0, wh_tax:0, cvt_rg_fed_tx:0, psf:0,
      refund_from_airline:0, pay_to_client:0
    });
  });

  visaRefundLines = (inv.visa_lines||[]).map(function(vl){
    return Object.assign({},vl,{_skip:false, refund_amount: vl.customer_receivable||vl.amount_pkr||0, refund_note:''});
  });

  hotelRefundLines = (inv.hotel_lines||[]).map(function(hl){
    return Object.assign({},hl,{_skip:false, refund_amount: hl.customer_receivable||hl.rent_amount||0, refund_note:''});
  });

  transRefundLines = (inv.transport_lines||[]).map(function(tl){
    return Object.assign({},tl,{_skip:false, refund_amount: tl.total_receivable||0, refund_note:''});
  });

  insRefundLines = (inv.insurance_lines||[]).map(function(il){
    return Object.assign({},il,{_skip:false, refund_amount: il.total_receivable||0, refund_note:''});
  });

  segmentLines = (inv.ticket_lines||[])
    .filter(function(tl){return (tl.no_of_segments||0)>0 && (tl.segment_id||0)>0;})
    .map(function(tl){
      return {
        original_ticket_line_id: tl.id,
        segment_id:    tl.segment_id,
        segment_name:  tl.segment_name,
        debitor_t_id:  tl.debitor_t_id||0,
        ticket_no:     tl.ticket_no, pnr: tl.pnr,
        original_no_of_segments: tl.no_of_segments||0,
        charge_per_segment:      tl.segment_charge_per||0,
        refund_segments: 0, refund_amount: 0,
      };
    });

  renderAll();
  $('#bankRows').empty();
  addBankRow();
  $('#mainBody').show();
  calcTotals();
  setTimeout(function(){$('#rfnd_date').focus();},100);
}

// ── RENDER ALL SECTIONS ───────────────────────────────────────────
function renderAll(){
  renderTicketCards();
  renderVisaSection();
  renderHotelSection();
  renderTransportSection();
  renderInsuranceSection();
  renderSegmentSection();
}

// ── TICKET REFUND CARDS ───────────────────────────────────────────
function renderTicketCards(){
  var html='';
  refundLines.forEach(function(rl, i){
    var skipped = rl._skip;
    html += '<div class="rf-ticket-card" id="tcard_'+i+'">' +
      '<div class="rf-ticket-head">' +
        '<span class="rf-tkt-badge">#'+(i+1)+'</span>' +
        '<strong style="font-size:var(--fsm);">'+(rl.ticket_no||'—')+'</strong>' +
        (rl.pnr?'<span style="font-size:var(--fl);color:#666;">PNR: '+esc(rl.pnr)+'</span>':'') +
        '<span style="font-size:var(--fl);color:#555;">'+esc(rl.pax_name||'')+'</span>' +
        (rl.airline_code?'<span class="rf-tkt-badge" style="background:#6f42c1;font-size:var(--fl);">'+esc(rl.airline_code)+'</span>':'') +
        '<span style="font-size:var(--fl);color:#888;">Agent: '+esc(rl.agent_name||'')+'</span>' +
        '<span style="font-size:var(--fl);color:var(--rb);margin-left:auto;">Fare+Txs: <strong>'+fmt(rl.fare_plus_txs)+'</strong></span>' +
        '<div class="rf-tkt-skip-chk">' +
          '<input type="checkbox" id="skip_'+i+'" data-skip-tkt="'+i+'"'+(skipped?' checked':'')+'>'+
          '<label for="skip_'+i+'">Skip (No Refund)</label>' +
        '</div>' +
      '</div>' +
      '<div class="rf-ticket-body"'+(skipped?' style="opacity:.4;pointer-events:none;"':'')+' id="tcbody_'+i+'">' +
        '<div class="rf-deductions">' +
          _dFld(i,'sector','Sector',rl.sector,'text','130px') +
          _dFld(i,'used_fare','Used Fare',rl.used_fare,'number','80px') +
          _dFld(i,'no_show_srvc','No Show/Srvc',rl.no_show_srvc,'number','80px') +
          _dFld(i,'canx_chrgs','Canx Chrgs',rl.canx_chrgs,'number','80px') +
          _dFld(i,'commission','Commission+',rl.commission,'number','80px') +
          _dFld(i,'other_taxes','Other Taxes',rl.other_taxes,'number','80px') +
          _dFld(i,'wh_tax','W.H Tax',rl.wh_tax,'number','80px') +
          _dFld(i,'cvt_rg_fed_tx','CVT/RG/FED',rl.cvt_rg_fed_tx,'number','80px') +
          _dFld(i,'psf','PSF (Agency)',rl.psf,'number','80px') +
        '</div>' +
        '<div class="rf-outputs">' +
          '<div class="rf-fd rf-out-rfnd"><label>Refund fr.Airline</label><input type="text" id="rfa_'+i+'" value="'+fmt(rl.refund_from_airline)+'" readonly></div>' +
          '<div class="rf-fd rf-out-pay"><label>Pay to Client</label><input type="text" id="ptc_'+i+'" value="'+fmt(rl.pay_to_client)+'" readonly></div>' +
          '<div class="rf-fd rf-out-psf"><label>PSF Income</label><input type="text" id="psfi_'+i+'" value="'+fmt(rl.psf||0)+'" readonly></div>' +
        '</div>' +
      '</div>' +
    '</div>';
  });
  $('#ticketCards').html(html);
}

function _dFld(idx, fname, lbl, val, type, width){
  var step = type==='number'?' step="0.01"':'';
  return '<div class="rf-fd">' +
    '<label>'+lbl+'</label>' +
    '<input type="'+(type==='number'?'number':'text')+'" id="rl_'+idx+'_'+fname+'" value="'+(val||0)+'"'+step+
    ' style="width:'+width+';" data-ri="'+idx+'" data-rf="'+fname+'" data-tkt-nav="'+idx+'">' +
    '</div>';
}

// Skip checkbox
$(document).on('change','[data-skip-tkt]',function(){
  var i = parseInt($(this).data('skip-tkt'));
  refundLines[i]._skip = $(this).is(':checked');
  if(refundLines[i]._skip){
    $('#tcbody_'+i).css({opacity:'.4','pointer-events':'none'});
    refundLines[i].refund_from_airline = 0;
    refundLines[i].pay_to_client = 0;
  } else {
    $('#tcbody_'+i).css({opacity:'','pointer-events':''});
    calcLine(i);
  }
  calcTotals();
});

// Ticket field input
$(document).on('input change','[data-ri]',function(){
  var i = parseInt($(this).data('ri'));
  var f = $(this).data('rf');
  if(f==='sector') refundLines[i].sector = $(this).val();
  else refundLines[i][f] = parseFloat($(this).val())||0;
  calcLine(i);
  calcTotals();
});

function calcLine(i){
  var rl = refundLines[i];
  if(rl._skip){ rl.refund_from_airline=0; rl.pay_to_client=0; return; }
  var deductions = (rl.used_fare||0)+(rl.no_show_srvc||0)+(rl.canx_chrgs||0)
                 + (rl.other_taxes||0)+(rl.wh_tax||0)+(rl.cvt_rg_fed_tx||0);
  var gross = (rl.fare_plus_txs||0) - deductions + (rl.commission||0);
  rl.refund_from_airline = gross;
  rl.pay_to_client       = gross - (rl.psf||0);
  $('#rfa_'+i).val(fmt(rl.refund_from_airline));
  $('#ptc_'+i).val(fmt(rl.pay_to_client));
  $('#psfi_'+i).val(fmt(rl.psf||0));
}

// Keyboard nav within a ticket card
$(document).on('keydown','[data-tkt-nav]',function(e){
  if(e.key!=='Enter') return;
  var cardIdx = parseInt($(this).attr('id').split('_')[1]);
  var FIELDS = ['sector','used_fare','no_show_srvc','canx_chrgs','commission','other_taxes','wh_tax','cvt_rg_fed_tx','psf'];
  var fname   = $(this).data('rf');
  var idx     = FIELDS.indexOf(fname);
  e.preventDefault(); e.stopPropagation();
  if(idx >= 0 && idx < FIELDS.length-1){
    $('#rl_'+cardIdx+'_'+FIELDS[idx+1]).focus().select();
  } else if(idx === FIELDS.length-1){
    // last field of this card: jump to first field of next card, or to refund date
    var nextCard = cardIdx+1;
    if(nextCard < refundLines.length && !refundLines[nextCard]._skip){
      $('#rl_'+nextCard+'_sector').focus().select();
    } else {
      // Move to service sections or bank amount
      var firstBank = $('#bankRows .bank-amt').first();
      if(firstBank.length) firstBank.focus().select();
    }
  }
});

// ── VISA REFUND SECTION ───────────────────────────────────────────
function renderVisaSection(){
  if(!visaRefundLines.length){$('#visaRefundSection').html('');return;}
  var h='<div style="border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0;">' +
    '<div class="rf-sec-head"><span><i class="fas fa-passport mr-1"></i>Visa Refund ('+visaRefundLines.length+')</span></div>' +
    '<div class="rf-sec-body">';
  visaRefundLines.forEach(function(vl,i){
    h += '<div class="rf-svc-row" id="vsrow_'+i+'">' +
      '<div class="rf-svc-lbl">'+esc(vl.name||'Visa #'+(i+1))+'</div>' +
      '<div class="rf-fd" style="font-size:var(--fl);color:#888;">Psprt: '+esc(vl.passport_no||'—')+' Vendor: '+esc(vl.vendor_name||'—')+'</div>' +
      '<div class="rf-fd"><label>Orig.Recv.</label><input type="text" value="'+fmt(vl.customer_receivable||vl.amount_pkr||0)+'" readonly class="rf-ro" style="width:90px;"></div>' +
      '<div class="rf-fd rf-svc-refund-out"><label>Refund Amt</label><input type="number" id="vr_'+i+'" value="'+((vl.refund_amount)||0)+'" step="0.01" style="width:90px;" data-vi="'+i+'"></div>' +
      '<div class="rf-fd"><label>Note</label><input type="text" id="vn_'+i+'" value="'+esc(vl.refund_note||'')+'" style="width:140px;" data-vin="'+i+'"></div>' +
      '<div class="rf-fd"><label>Skip</label><input type="checkbox" id="vskip_'+i+'" data-skip-visa="'+i+'"'+(vl._skip?' checked':'')+' style="margin-top:4px;width:14px;height:14px;"></div>' +
    '</div>';
  });
  h += '</div></div>';
  $('#visaRefundSection').html(h);
}

$(document).on('input','[data-vi]',function(){
  var i=parseInt($(this).data('vi'));
  visaRefundLines[i].refund_amount = parseFloat($(this).val())||0;
  calcTotals();
});
$(document).on('input','[data-vin]',function(){
  var i=parseInt($(this).data('vin'));
  visaRefundLines[i].refund_note = $(this).val();
});
$(document).on('change','[data-skip-visa]',function(){
  var i=parseInt($(this).data('skip-visa'));
  visaRefundLines[i]._skip = $(this).is(':checked');
  if(visaRefundLines[i]._skip) visaRefundLines[i].refund_amount=0;
  calcTotals();
});

// ── HOTEL REFUND SECTION ──────────────────────────────────────────
function renderHotelSection(){
  if(!hotelRefundLines.length){$('#hotelRefundSection').html('');return;}
  var h='<div style="border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0;">' +
    '<div class="rf-sec-head"><span><i class="fas fa-hotel mr-1"></i>Hotel Refund ('+hotelRefundLines.length+')</span></div>' +
    '<div class="rf-sec-body">';
  hotelRefundLines.forEach(function(hl,i){
    h += '<div class="rf-svc-row" id="hrrow_'+i+'">' +
      '<div class="rf-svc-lbl">'+esc(hl.passenger_name||'Hotel #'+(i+1))+'</div>' +
      '<div class="rf-fd" style="font-size:var(--fl);color:#888;">Hotel: '+esc(hl.hotel_name||'—')+' Vendor: '+esc(hl.vendor_name||'—')+'</div>' +
      '<div class="rf-fd"><label>Orig.Recv.</label><input type="text" value="'+fmt(hl.customer_receivable||hl.rent_amount||0)+'" readonly class="rf-ro" style="width:90px;"></div>' +
      '<div class="rf-fd rf-svc-refund-out"><label>Refund Amt</label><input type="number" id="hr_'+i+'" value="'+(hl.refund_amount||0)+'" step="0.01" style="width:90px;" data-hi="'+i+'"></div>' +
      '<div class="rf-fd"><label>Note</label><input type="text" id="hn_'+i+'" value="'+esc(hl.refund_note||'')+'" style="width:140px;" data-hin="'+i+'"></div>' +
      '<div class="rf-fd"><label>Skip</label><input type="checkbox" id="hskip_'+i+'" data-skip-hotel="'+i+'"'+(hl._skip?' checked':'')+' style="margin-top:4px;width:14px;height:14px;"></div>' +
    '</div>';
  });
  h += '</div></div>';
  $('#hotelRefundSection').html(h);
}

$(document).on('input','[data-hi]',function(){
  var i=parseInt($(this).data('hi'));
  hotelRefundLines[i].refund_amount = parseFloat($(this).val())||0;
  calcTotals();
});
$(document).on('input','[data-hin]',function(){
  var i=parseInt($(this).data('hin'));
  hotelRefundLines[i].refund_note = $(this).val();
});
$(document).on('change','[data-skip-hotel]',function(){
  var i=parseInt($(this).data('skip-hotel'));
  hotelRefundLines[i]._skip = $(this).is(':checked');
  if(hotelRefundLines[i]._skip) hotelRefundLines[i].refund_amount=0;
  calcTotals();
});

// ── TRANSPORT REFUND SECTION ──────────────────────────────────────
function renderTransportSection(){
  if(!transRefundLines.length){$('#transportRefundSection').html('');return;}
  var h='<div style="border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0;">' +
    '<div class="rf-sec-head"><span><i class="fas fa-car mr-1"></i>Transport Refund ('+transRefundLines.length+')</span></div>' +
    '<div class="rf-sec-body">';
  transRefundLines.forEach(function(tl,i){
    h += '<div class="rf-svc-row">' +
      '<div class="rf-svc-lbl">'+esc(tl.passenger_name||'Transport #'+(i+1))+'</div>' +
      '<div class="rf-fd" style="font-size:var(--fl);color:#888;">'+esc(tl.car_type||'—')+' Vendor: '+esc(tl.vendor_name||'—')+'</div>' +
      '<div class="rf-fd"><label>Orig.Recv.</label><input type="text" value="'+fmt(tl.total_receivable||0)+'" readonly class="rf-ro" style="width:90px;"></div>' +
      '<div class="rf-fd rf-svc-refund-out"><label>Refund Amt</label><input type="number" id="tr_'+i+'" value="'+(tl.refund_amount||0)+'" step="0.01" style="width:90px;" data-tri="'+i+'"></div>' +
      '<div class="rf-fd"><label>Note</label><input type="text" id="tn_'+i+'" value="'+esc(tl.refund_note||'')+'" style="width:140px;" data-trin="'+i+'"></div>' +
      '<div class="rf-fd"><label>Skip</label><input type="checkbox" id="tskip_'+i+'" data-skip-trans="'+i+'"'+(tl._skip?' checked':'')+' style="margin-top:4px;width:14px;height:14px;"></div>' +
    '</div>';
  });
  h += '</div></div>';
  $('#transportRefundSection').html(h);
}

$(document).on('input','[data-tri]',function(){
  var i=parseInt($(this).data('tri'));
  transRefundLines[i].refund_amount=parseFloat($(this).val())||0;
  calcTotals();
});
$(document).on('change','[data-skip-trans]',function(){
  var i=parseInt($(this).data('skip-trans'));
  transRefundLines[i]._skip=$(this).is(':checked');
  if(transRefundLines[i]._skip)transRefundLines[i].refund_amount=0;
  calcTotals();
});

// ── INSURANCE REFUND SECTION ──────────────────────────────────────
function renderInsuranceSection(){
  if(!insRefundLines.length){$('#insuranceRefundSection').html('');return;}
  var h='<div style="border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0;">' +
    '<div class="rf-sec-head"><span><i class="fas fa-shield-alt mr-1"></i>Insurance Refund ('+insRefundLines.length+')</span></div>' +
    '<div class="rf-sec-body">';
  insRefundLines.forEach(function(il,i){
    h += '<div class="rf-svc-row">' +
      '<div class="rf-svc-lbl">'+esc(il.client_name||'Insurance #'+(i+1))+'</div>' +
      '<div class="rf-fd" style="font-size:var(--fl);color:#888;">'+esc(il.insurance_company||'—')+' Vendor: '+esc(il.vendor_name||'—')+'</div>' +
      '<div class="rf-fd"><label>Orig.Recv.</label><input type="text" value="'+fmt(il.total_receivable||0)+'" readonly class="rf-ro" style="width:90px;"></div>' +
      '<div class="rf-fd rf-svc-refund-out"><label>Refund Amt</label><input type="number" id="ir_'+i+'" value="'+(il.refund_amount||0)+'" step="0.01" style="width:90px;" data-ini="'+i+'"></div>' +
      '<div class="rf-fd"><label>Note</label><input type="text" id="in_'+i+'" value="'+esc(il.refund_note||'')+'" style="width:140px;" data-inin="'+i+'"></div>' +
      '<div class="rf-fd"><label>Skip</label><input type="checkbox" id="iskip_'+i+'" data-skip-ins="'+i+'"'+(il._skip?' checked':'')+' style="margin-top:4px;width:14px;height:14px;"></div>' +
    '</div>';
  });
  h += '</div></div>';
  $('#insuranceRefundSection').html(h);
}

$(document).on('input','[data-ini]',function(){
  var i=parseInt($(this).data('ini'));
  insRefundLines[i].refund_amount=parseFloat($(this).val())||0;
  calcTotals();
});
$(document).on('change','[data-skip-ins]',function(){
  var i=parseInt($(this).data('skip-ins'));
  insRefundLines[i]._skip=$(this).is(':checked');
  if(insRefundLines[i]._skip)insRefundLines[i].refund_amount=0;
  calcTotals();
});

// ── SEGMENT REFUND SECTION ────────────────────────────────────────
function renderSegmentSection(){
  if(!segmentLines.length){$('#segmentSection').html('');return;}
  var h='<div style="border:1px solid var(--rbdr);border-radius:3px;overflow:hidden;flex-shrink:0;">' +
    '<div class="rf-sec-head"><span><i class="fas fa-route mr-1"></i>Segment Refund</span></div>' +
    '<div style="background:#fff;padding:5px 8px;">';
  segmentLines.forEach(function(sl, i){
    h += '<div class="rf-seg-row" id="srow_'+i+'">' +
      '<div style="flex:0 0 150px;font-size:var(--fsm);font-weight:700;color:var(--rb);">'+esc(sl.segment_name)+'</div>' +
      '<div style="font-size:var(--fl);color:#666;flex:0 0 130px;">'+esc(sl.ticket_no)+'  '+(sl.pnr?'PNR: '+sl.pnr:'')+'</div>' +
      '<div class="rf-fd"><label>Orig.Segs</label><input type="text" value="'+sl.original_no_of_segments+'" readonly class="rf-ro" style="width:60px;"></div>' +
      '<div class="rf-fd"><label>Chg/Seg</label><input type="text" value="'+fmt(sl.charge_per_segment)+'" readonly class="rf-ro" style="width:80px;"></div>' +
      '<div class="rf-fd"><label>Refund Segs</label>' +
        '<input type="number" id="seg_'+i+'" value="'+sl.refund_segments+'" min="0" max="'+sl.original_no_of_segments+'" step="1" style="width:70px;" data-si="'+i+'">' +
      '</div>' +
      '<div class="rf-fd"><label>Refund Amt</label><input type="text" id="sega_'+i+'" value="'+fmt(sl.refund_amount)+'" readonly class="rf-ro" style="width:90px;"></div>' +
    '</div>';
  });
  h += '</div></div>';
  $('#segmentSection').html(h);
}

$(document).on('input change','[data-si]',function(){
  var i=parseInt($(this).data('si'));
  var v=parseInt($(this).val())||0;
  var max=segmentLines[i].original_no_of_segments||0;
  if(v>max){v=max;$(this).val(v);}
  if(v<0){v=0;$(this).val(v);}
  segmentLines[i].refund_segments=v;
  segmentLines[i].refund_amount=v*(segmentLines[i].charge_per_segment||0);
  $('#sega_'+i).val(fmt(segmentLines[i].refund_amount));
  calcTotals();
});

// ── TOTALS ────────────────────────────────────────────────────────
function calcTotals(){
  var totRFA=0, totPTC=0, totPSF=0, totSvc=0, totSeg=0;
  refundLines.forEach(function(rl){
    if(!rl._skip){
      totRFA += rl.refund_from_airline||0;
      totPTC += rl.pay_to_client||0;
      totPSF += rl.psf||0;
    }
  });
  visaRefundLines.forEach(function(vl){if(!vl._skip) totSvc += vl.refund_amount||0;});
  hotelRefundLines.forEach(function(hl){if(!hl._skip) totSvc += hl.refund_amount||0;});
  transRefundLines.forEach(function(tl){if(!tl._skip) totSvc += tl.refund_amount||0;});
  insRefundLines.forEach(function(il){if(!il._skip) totSvc += il.refund_amount||0;});
  segmentLines.forEach(function(sl){totSeg += sl.refund_amount||0;});

  var grand  = totPTC + totSvc;
  var paid   = calcBankTotal();
  var balDue = grand - paid;

  $('#tot_rfnd_airline').val(fmt(totRFA));
  $('#tot_pay_client').val(fmt(totPTC));
  $('#tot_psf_income').val(fmt(totPSF));
  $('#tot_svc_refund').val(fmt(totSvc));
  $('#tot_seg_reversal').val(fmt(totSeg));
  $('#tot_grand').val(fmt(grand));
  $('#tot_balance_due').val(fmt(Math.max(balDue,0)));
}

// ── BANK ──────────────────────────────────────────────────────────
function bankOpts(){
  var o='<option value="">-- Bank --</option>';
  BANKS.forEach(function(b){o+='<option value="'+b.id+'">'+esc(b.name)+'</option>';});
  return o;
}
function addBankRow(bid,amt){
  var h='<div class="rf-bank-row">'+
    '<select class="form-control bank-sel">'+bankOpts()+'</select>'+
    '<input type="number" class="form-control bank-amt" value="'+(amt||'')+'" min="0" step="0.01" placeholder="Amount">'+
    '<button class="bx" onclick="$(this).closest(\'.rf-bank-row\').remove();calcBankTotal();calcTotals();"><i class="fas fa-times"></i></button>'+
    '</div>';
  $('#bankRows').append(h);
  if(bid) $('#bankRows .rf-bank-row:last .bank-sel').val(bid);
}
$('#btnAddBank').on('click',function(){addBankRow();});
$(document).on('input change','.bank-amt',function(){calcBankTotal();calcTotals();});

function calcBankTotal(){
  var t=0; $('.bank-amt').each(function(){t+=parseFloat($(this).val())||0;});
  $('#bankTotal').text(fmt(t));
  return t;
}
function collectBanks(){
  var pays=[];
  $('.rf-bank-row').each(function(){
    var bid=parseInt($(this).find('.bank-sel').val())||0;
    var amt=parseFloat($(this).find('.bank-amt').val())||0;
    if(bid&&amt>0)pays.push({bank_id:bid,amount:amt});
  });
  return pays;
}

// Bank row keyboard nav
$(document).on('keydown','.bank-sel',function(e){
  if(e.key==='Enter'){e.preventDefault();$(this).closest('.rf-bank-row').find('.bank-amt').focus().select();}
});
$(document).on('keydown','.bank-amt',function(e){
  if(e.key==='Enter'){
    e.preventDefault();
    // If last bank row, either add new or save
    var rows=$('.rf-bank-row');
    var isLast = $(this).closest('.rf-bank-row').index()===rows.length-1;
    if(isLast && parseFloat($(this).val())>0){
      // click save
      isEdit?$('#btnUpdate').click():$('#btnSave').click();
    }
  }
});

// ── SAVE ──────────────────────────────────────────────────────────
$('#btnSave,#btnUpdate').on('click',function(){
  if(!currentInvoice&&!isEdit){Swal.fire('Error','Search and select an original invoice first.','warning');return;}

  var rfndDate = fpISO('rfnd_date');
  if(!rfndDate){Swal.fire('Error','Refund date is required.','warning');return;}

  var hasAny =
    refundLines.some(function(rl){return !rl._skip&&(rl.refund_from_airline||0)!==0;}) ||
    visaRefundLines.some(function(vl){return !vl._skip&&(vl.refund_amount||0)>0;}) ||
    hotelRefundLines.some(function(hl){return !hl._skip&&(hl.refund_amount||0)>0;}) ||
    transRefundLines.some(function(tl){return !tl._skip&&(tl.refund_amount||0)>0;}) ||
    insRefundLines.some(function(il){return !il._skip&&(il.refund_amount||0)>0;}) ||
    segmentLines.some(function(sl){return (sl.refund_amount||0)>0;});

  if(!hasAny){
    Swal.fire('Error','No refund amounts entered. Fill in at least one section.','warning');
    return;
  }

  var payload = {
    folder_no:             isEdit ? editFN : null,
    original_folder_no:    parseInt($('#original_folder_no_hid').val()),
    invoice_date:          rfndDate,
    refund_lines: refundLines.map(function(rl){
      return {
        _skip:                     rl._skip||false,
        original_line_id:          rl.id||0,
        ticket_no:                 rl.ticket_no||'',
        pnr:                       rl.pnr||'',
        pax_name:                  rl.pax_name||'',
        airline_code:              rl.airline_code||'',
        agent_id:                  rl.agent_id||0,
        agent_name:                rl.agent_name||'',
        original_fare_plus_txs:    rl.fare_plus_txs||0,
        original_tot_commission:   rl.tot_commission||0,
        sector:                    rl.sector||'',
        used_fare:                 rl.used_fare||0,
        no_show_srvc:              rl.no_show_srvc||0,
        canx_chrgs:                rl.canx_chrgs||0,
        commission:                rl.commission||0,
        other_taxes:               rl.other_taxes||0,
        wh_tax:                    rl.wh_tax||0,
        cvt_rg_fed_tx:             rl.cvt_rg_fed_tx||0,
        psf:                       rl.psf||0,
        refund_from_airline:       rl._skip?0:(rl.refund_from_airline||0),
        pay_to_client:             rl._skip?0:(rl.pay_to_client||0),
      };
    }),
    visa_refund_lines: visaRefundLines.map(function(vl){
      return {
        original_visa_id: vl.id||0,
        name: vl.name||'', passport_no: vl.passport_no||'',
        vendor_id: vl.vendor_id||0, vendor_name: vl.vendor_name||'',
        original_amount: vl.customer_receivable||vl.amount_pkr||0,
        refund_amount: vl._skip?0:(vl.refund_amount||0),
        refund_note: vl.refund_note||'',
        _skip: vl._skip||false,
      };
    }),
    hotel_refund_lines: hotelRefundLines.map(function(hl){
      return {
        original_hotel_id: hl.id||0,
        passenger_name: hl.passenger_name||'', hotel_name: hl.hotel_name||'',
        vendor_id: hl.vendor_id||0, vendor_name: hl.vendor_name||'',
        original_amount: hl.customer_receivable||hl.rent_amount||0,
        refund_amount: hl._skip?0:(hl.refund_amount||0),
        refund_note: hl.refund_note||'',
        _skip: hl._skip||false,
      };
    }),
    transport_refund_lines: transRefundLines.map(function(tl){
      return {
        original_transport_id: tl.id||0,
        passenger_name: tl.passenger_name||'', car_type: tl.car_type||'',
        vendor_id: tl.vendor_id||0, vendor_name: tl.vendor_name||'',
        original_amount: tl.total_receivable||0,
        refund_amount: tl._skip?0:(tl.refund_amount||0),
        refund_note: tl.refund_note||'',
        _skip: tl._skip||false,
      };
    }),
    insurance_refund_lines: insRefundLines.map(function(il){
      return {
        original_insurance_id: il.id||0,
        client_name: il.client_name||'', insurance_company: il.insurance_company||'',
        vendor_id: il.vendor_id||0, vendor_name: il.vendor_name||'',
        original_amount: il.total_receivable||0,
        refund_amount: il._skip?0:(il.refund_amount||0),
        refund_note: il.refund_note||'',
        _skip: il._skip||false,
      };
    }),
    segment_refund_lines: segmentLines.map(function(sl){
      return {
        original_ticket_line_id:  sl.original_ticket_line_id||0,
        segment_id:               sl.segment_id||0,
        segment_name:             sl.segment_name||'',
        debitor_t_id:             sl.debitor_t_id||0,
        ticket_no:                sl.ticket_no||'',
        pnr:                      sl.pnr||'',
        original_no_of_segments:  sl.original_no_of_segments||0,
        charge_per_segment:       sl.charge_per_segment||0,
        refund_segments:          sl.refund_segments||0,
        refund_amount:            sl.refund_amount||0,
      };
    }),
    bank_payments: collectBanks(),
  };

  sL();
  $.ajax({
    url: API.save, type:'POST',
    contentType:'application/json', headers:{'X-CSRFToken':csrf},
    data: JSON.stringify(payload),
    success:function(r){
      hL();
      if(r.ok){
        Swal.fire({icon:'success',title:'Saved!',text:r.message,timer:1500,showConfirmButton:false})
          .then(function(){window.location.href='/ticket/refund/'+r.folder_no+'/';});
      } else { Swal.fire('Error',r.error||'Failed','error'); }
    },
    error:function(x){hL();Swal.fire('Error',(x.responseJSON&&x.responseJSON.error)||'Server error','error');}
  });
});

// ── DELETE ────────────────────────────────────────────────────────
$('#btnDelete').on('click',function(){
  if(!isEdit)return;
  Swal.fire({title:'Delete Refund #'+editFN+'?',icon:'warning',showCancelButton:true,
    confirmButtonColor:'#dc3545',confirmButtonText:'Delete'
  }).then(function(r){
    if(!r.isConfirmed)return;sL();
    $.ajax({url:API.del,type:'POST',headers:{'X-CSRFToken':csrf},
      success:function(r){
        hL();
        if(r.ok)Swal.fire({icon:'success',title:'Deleted!',timer:1500,showConfirmButton:false})
          .then(function(){window.location.href='/ticket/refund/';});
        else Swal.fire('Error',r.error,'error');
      },
      error:function(){hL();Swal.fire('Error','Server error','error');}
    });
  });
});

// ── LOAD EXISTING REFUND INVOICE ──────────────────────────────────
function loadRefundInvoice(){
  if(!isEdit)return;sL();
  $.getJSON(API.get).done(function(r){
    hL();
    if(!r.ok){Swal.fire('Error',r.error||'Not found','error');return;}
    var inv=r.invoice;

    fpSet('rfnd_date',inv.invoice_date);
    $('#rfnd_folder_no').val(inv.folder_no);
    $('#rfnd_receipt').val(inv.receipt_no);
    $('#orig_folder_no').val(inv.original_folder_no);
    $('#original_folder_no_hid').val(inv.original_folder_no);
    $('#rfnd_client').val(inv.client_name);
    $('#rfnd_client_id').val(inv.client_id);
    $('#rfnd_created_by').text(inv.created_by+(inv.created_at?' : '+inv.created_at:''));
    $('#rfnd_edited_by').text(inv.edited_by||'');

    $('#invInfoBar').html(
      '<span class="rf-inv-badge">Refund #'+inv.folder_no+'</span>' +
      '<span class="rf-inv-detail">Original Invoice: <strong>#'+inv.original_folder_no+'</strong></span>' +
      '<span class="rf-inv-detail">Client: <strong>'+esc(inv.client_name)+'</strong></span>'
    );

    // Restore state from saved data
    refundLines = (inv.refund_lines||[]).map(function(rl){
      return Object.assign({},rl,{
        _skip: !!(rl._skip),
        fare_plus_txs: rl.original_fare_plus_txs||0,
        tot_commission: rl.original_tot_commission||0,
      });
    });
    visaRefundLines  = (inv.visa_refund_lines||[]).map(function(vl){
      return Object.assign({},vl,{_skip:vl._skip||false});
    });
    hotelRefundLines = (inv.hotel_refund_lines||[]).map(function(hl){
      return Object.assign({},hl,{_skip:hl._skip||false});
    });
    transRefundLines = (inv.transport_refund_lines||[]).map(function(tl){
      return Object.assign({},tl,{_skip:tl._skip||false});
    });
    insRefundLines   = (inv.insurance_refund_lines||[]).map(function(il){
      return Object.assign({},il,{_skip:il._skip||false});
    });
    segmentLines = (inv.segment_refund_lines||[]);

    currentInvoice = {folder_no: inv.original_folder_no};

    renderAll();
    refundLines.forEach(function(rl,i){calcLine(i);});

    // Re-inject segment values
    segmentLines.forEach(function(sl,i){
      $('#seg_'+i).val(sl.refund_segments||0);
      $('#sega_'+i).val(fmt(sl.refund_amount||0));
    });

    // Bank payments
    $('#bankRows').empty();
    if(inv.bank_payments&&inv.bank_payments.length)
      inv.bank_payments.forEach(function(bp){addBankRow(bp.bank_id,bp.amount);});
    else addBankRow();

    calcBankTotal();
    calcTotals();

    $('#mainBody').show();
    $('#btnUpdate').show();
    $('#btnDelete').show();
    $('#btnPrint').show();
    $('#btnSave').hide();

  }).fail(function(){hL();Swal.fire('Error','Failed to load','error');});
}

// ── PRINT ─────────────────────────────────────────────────────────
$('#btnPrint').on('click',function(){
  if(isEdit) window.open('/ticket/refund/print/'+editFN+'/', '_blank');
});

// ── KEYBOARD: global shortcuts ─────────────────────────────────────
$(document).on('keydown',function(e){
  if(e.ctrlKey&&e.key==='s'){
    e.preventDefault();
    isEdit?$('#btnUpdate').click():$('#btnSave').click();
  }
  if(e.key==='F7'){
    e.preventDefault();
    isEdit?$('#btnUpdate').click():$('#btnSave').click();
  }
});

// ── INIT ──────────────────────────────────────────────────────────
$(function(){
  initFP();
  fpSet('rfnd_date', TODAY);
  if(isEdit) loadRefundInvoice();
  else {
    addBankRow();
    setTimeout(function(){$('#srch_inv').focus();},100);
  }
});

})();
</script>
{% endblock %}