<?php

go_form_admin_action('export_csv');
if (!isset($_POST['value_one'])) {
  wp_redirect(admin_url('admin.php?page=go-form-settings'));
  exit;
}

$form_id = intval($_POST['value_one']);
$form = go_form_get_form_by_id($form_id);
$form_name = $form ? $form->name : 'Unknown Form';
$entries = go_form_get_entries($form_id);
$custom_fields = go_form_get_custom_fields($form_id);

header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename="go-form-' . sanitize_title($form_name) . '-export.csv"');

$output = fopen('php://output', 'w');

// Build header row
$header = ['N', 'First Name', 'Last Name', 'Country', 'Club', 'Rank', 'Rating', 'EGD Number', 'Date Added'];
foreach ($custom_fields as $field) {
  $header[] = $field->field_name;
}
fputcsv($output, $header);

foreach ($entries as $i => $e) {
  global $ranks;
  $row = [
    $i,
    $e->first_name,
    $e->last_name,
    $e->country,
    $e->club,
    $ranks[$e->rank] ?? '',
    $e->rating,
    $e->egd_number,
    $e->created_at
  ];
  
  // Add custom field values
  foreach ($custom_fields as $field) {
    $value = go_form_get_custom_value($e->id, $field->id);
    $row[] = $value;
  }
  
  fputcsv($output, $row);
}

fclose($output);