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Filename : features.php
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<?php
if (!defined('ABSPATH')) exit;
/* ============ Bayi Sihat — Features: newsletter, auto internal links, GA4, WhatsApp ============ */

/* ---------- 1. Newsletter (subscriber storage, no third-party needed) ---------- */
add_action('init', function(){
  register_post_type('bs_subscriber', array(
    'labels' => array('name'=>'Pelanggan Surat Berita','singular_name'=>'Pelanggan','menu_name'=>'Pelanggan Surat Berita'),
    'public' => false,
    'show_ui' => true,
    'show_in_menu' => true,
    'menu_icon' => 'dashicons-email-alt',
    'supports' => array('title'),
    'capability_type' => 'post',
    'map_meta_cap' => true,
  ));
});

function bs_subscribe_handler(){
  if (!check_ajax_referer('bs_sub', 'nonce', false)) {
    wp_send_json_error(array('msg' => 'Sesi tamat — sila muat semula halaman.'));
  }
  // honeypot: bots fill "website" — pretend success silently
  if (!empty($_POST['website'])) {
    wp_send_json_success(array('msg' => 'Terima kasih! Anda telah dilanggan.', 'unlock' => false));
  }
  $email = sanitize_email(wp_unslash($_POST['email'] ?? ''));
  if (!is_email($email)) {
    wp_send_json_error(array('msg' => 'Sila masukkan alamat e-mel yang sah.'));
  }
  $ip = isset($_SERVER['REMOTE_ADDR']) ? sanitize_text_field($_SERVER['REMOTE_ADDR']) : '';
  $tkey = 'bs_sub_' . md5($ip);
  if (get_transient($tkey)) {
    wp_send_json_error(array('msg' => 'Terlalu pantas — sila cuba sebentar lagi.'));
  }
  set_transient($tkey, 1, 20);

  $src = sanitize_text_field(wp_unslash($_POST['src'] ?? 'newsletter'));
  $ebook = function_exists('bs_sub_ebook_url');
  $existing = get_posts(array('post_type'=>'bs_subscriber','title'=>$email,'post_status'=>'any','numberposts'=>1,'fields'=>'ids'));
  if (!empty($existing)) {
    $sid = $existing[0];
    update_post_meta($sid, 'bs_ebook_lead', current_time('mysql'));
    bs_mailerlite_sync($email, $src);
    wp_send_json_success(array(
      'msg'    => 'E-mel anda memang dalam senarai kami 🌱 Ebook & bonus anda di bawah.',
      'unlock' => true,
      'ebook'  => $ebook ? bs_sub_ebook_url($sid) : '',
    ));
  }
  $id = wp_insert_post(array(
    'post_type' => 'bs_subscriber',
    'post_title' => $email,
    'post_status' => 'publish',
  ), true);
  if (is_wp_error($id)) {
    wp_send_json_error(array('msg' => 'Maaf, ada masalah teknikal. Cuba lagi sebentar.'));
  }
  update_post_meta($id, 'bs_sub_ip', $ip);
  update_post_meta($id, 'bs_sub_date', current_time('mysql'));
  update_post_meta($id, 'bs_sub_src', $src);
  update_post_meta($id, 'bs_sub_source', esc_url_raw(wp_get_referer() ?: ''));
  update_post_meta($id, 'bs_ebook_lead', current_time('mysql'));
  bs_mailerlite_sync($email, $src);
  wp_send_json_success(array(
    'msg'    => 'Terima kasih! Anda kini pelanggan Bayi Sihat 🌱 Ebook anda sedia di bawah.',
    'unlock' => true,
    'ebook'  => $ebook ? bs_sub_ebook_url($id) : '',
  ));
}
add_action('wp_ajax_nopriv_bs_subscribe', 'bs_subscribe_handler');
add_action('wp_ajax_bs_subscribe', 'bs_subscribe_handler');

/* Push subscriber to MailerLite (best-effort; local storage stays source of truth).
   Two steps: upsert subscriber, then assign to group (the create-call `groups`
   field is unreliable, so we use the dedicated assign endpoint). */
function bs_mailerlite_sync($email, $src = ''){
  $token = trim(get_option('bs_mailerlite_token', ''));
  if (!$token || !is_email($email)) return false;
  $headers = array(
    'Authorization' => 'Bearer ' . $token,
    'Content-Type'  => 'application/json',
    'Accept'        => 'application/json',
  );
  $res = wp_remote_post('https://connect.mailerlite.com/api/subscribers', array(
    'timeout' => 8, 'headers' => $headers,
    'body' => wp_json_encode(array('email' => $email)),
  ));
  if (is_wp_error($res)) return false;
  $code = wp_remote_retrieve_response_code($res);
  if ($code < 200 || $code >= 300) return false;
  $data = json_decode(wp_remote_retrieve_body($res), true);
  $sid  = isset($data['data']['id']) ? $data['data']['id'] : '';
  $group = trim(get_option('bs_mailerlite_group', ''));
  if ($sid && $group) {
    wp_remote_post('https://connect.mailerlite.com/api/subscribers/' . rawurlencode($sid) . '/groups/' . rawurlencode($group), array(
      'timeout' => 8, 'headers' => $headers,
    ));
  }
  return true;
}

// CSV export (admin)
add_action('admin_post_bs_export_subs', function(){
  if (!current_user_can('manage_options') || !wp_verify_nonce($_GET['_wpnonce'] ?? '', 'bs_export')) wp_die('Tidak dibenarkan');
  $subs = get_posts(array('post_type'=>'bs_subscriber','numberposts'=>-1,'post_status'=>'publish'));
  header('Content-Type: text/csv; charset=utf-8');
  header('Content-Disposition: attachment; filename=bayisihat-subscribers-' . wp_date('Ymd') . '.csv');
  $out = fopen('php://output', 'w');
  fputcsv($out, array('email','tarikh','sumber'));
  foreach ($subs as $s) {
    fputcsv($out, array($s->post_title, get_post_meta($s->ID,'bs_sub_date',true), get_post_meta($s->ID,'bs_sub_source',true)));
  }
  fclose($out);
  exit;
});
add_action('admin_notices', function(){
  $screen = function_exists('get_current_screen') ? get_current_screen() : null;
  if (!$screen || $screen->post_type !== 'bs_subscriber') return;
  $count = wp_count_posts('bs_subscriber')->publish;
  $url = wp_nonce_url(admin_url('admin-post.php?action=bs_export_subs'), 'bs_export');
  echo '<div class="notice notice-info"><p><strong>' . intval($count) . ' pelanggan.</strong> <a href="' . esc_url($url) . '" class="button">Muat turun CSV</a> — boleh diimport ke MailerLite/Mailchimp bila-bila.</p></div>';
});

// Reusable newsletter form component (with lead magnet reveal)
function bs_newsletter_form($title = '', $desc = ''){
  $title = $title ?: 'Panduan mingguan, terus ke e-mel anda';
  $desc  = $desc ?: 'Langgan percuma & dapatkan 2 PDF bonus: Checklist Hospital Bag + Jadual Imunisasi (printable).';
  $nonce = wp_create_nonce('bs_sub');
  $ajax  = admin_url('admin-ajax.php');
  $up    = wp_upload_dir();
  $pdf1  = $up['baseurl'] . '/lead/checklist-hospital-bag-bayisihat.pdf';
  $pdf2  = $up['baseurl'] . '/lead/jadual-imunisasi-bayisihat.pdf';
  $wa    = trim(get_option('bs_whatsapp_url', ''));
  ob_start(); ?>
  <div class="newsletter">
    <div class="newsletter__text">
      <h2><?php echo esc_html($title); ?></h2>
      <p><?php echo esc_html($desc); ?></p>
      <?php if ($wa): ?><p style="margin-top:.7rem"><a class="wa-channel" href="<?php echo esc_url($wa); ?>" target="_blank" rel="noopener">💬 Sertai Komuniti WhatsApp Bayi Sihat</a></p><?php endif; ?>
    </div>
    <div class="newsletter__action">
      <form class="newsletter__form bs-sub-form" data-nonce="<?php echo esc_attr($nonce); ?>" data-ajax="<?php echo esc_url($ajax); ?>">
        <input type="email" name="email" required placeholder="Alamat e-mel anda" aria-label="Alamat e-mel">
        <input type="text" name="website" class="bs-hp" tabindex="-1" autocomplete="off" aria-hidden="true">
        <button class="btn btn--primary" type="submit">Langgan</button>
      </form>
      <div class="bs-sub-msg" role="status" aria-live="polite"></div>
      <div class="bs-sub-gift" hidden>
        <a class="bs-gift-link bs-ebook-dl" href="#" target="_blank" rel="noopener">📘 Ebook: Panduan Kehamilan Lengkap (73 m/s, PDF)</a>
        <a class="bs-gift-link" href="<?php echo esc_url($pdf1); ?>" target="_blank" rel="noopener">📄 Checklist Hospital Bag (PDF)</a>
        <a class="bs-gift-link" href="<?php echo esc_url($pdf2); ?>" target="_blank" rel="noopener">📄 Jadual Imunisasi Printable (PDF)</a>
      </div>
    </div>
  </div>
  <?php return ob_get_clean();
}

/* ---------- 1b. Ebook lead-magnet hook (pancing dalam setiap artikel) ---------- */
function bs_ebook_hook(){
  $nonce = wp_create_nonce('bs_sub');
  $ajax  = admin_url('admin-ajax.php');
  ob_start(); ?>
  <aside class="bs-ebook-hook" aria-label="Ebook percuma">
    <div class="bs-ebook-hook__cover" aria-hidden="true">
      <span class="bs-ebook-hook__brand">BAYI SIHAT</span>
      <span class="bs-ebook-hook__ct">Panduan<br>Kehamilan<br>Lengkap</span>
      <span class="bs-ebook-hook__ed">73 m/s · PDF</span>
    </div>
    <div class="bs-ebook-hook__body">
      <p class="bs-ebook-hook__tag">Ebook Percuma <s>RM19</s> <b>PERCUMA</b></p>
      <h3 class="bs-ebook-hook__title">Dapatkan Panduan Kehamilan Lengkap — 73 muka surat</h3>
      <p class="bs-ebook-hook__desc">Semua panduan dari tanda awal hamil hingga hari bersalin, dalam satu PDF kemas untuk dibaca offline &amp; dicetak. Masukkan e-mel — terus dapat, tiada bayaran.</p>
      <form class="newsletter__form bs-sub-form" data-nonce="<?php echo esc_attr($nonce); ?>" data-ajax="<?php echo esc_url($ajax); ?>">
        <input type="email" name="email" required placeholder="Alamat e-mel anda" aria-label="E-mel">
        <input type="text" name="website" class="bs-hp" tabindex="-1" autocomplete="off" aria-hidden="true">
        <input type="hidden" name="src" value="ebook-artikel">
        <button class="btn btn--primary" type="submit">Dapatkan Ebook Percuma</button>
      </form>
      <div class="bs-sub-msg" role="status" aria-live="polite"></div>
      <div class="bs-sub-gift" hidden>
        <a class="bs-gift-link bs-ebook-dl" href="#" target="_blank" rel="noopener">📘 Muat Turun Ebook (PDF) ↓</a>
      </div>
      <p class="bs-ebook-hook__trust">🔒 Percuma · Tiada spam · Berhenti langgan bila-bila</p>
    </div>
  </aside>
  <?php return ob_get_clean();
}

// Inject the ebook hook into the middle of every article (after the 4th paragraph).
add_filter('the_content', 'bs_inject_ebook_hook', 25);
function bs_inject_ebook_hook($content){
  if (!is_singular('post') || !in_the_loop() || !is_main_query()) return $content;
  if (strpos($content, 'bs-ebook-hook') !== false) return $content;
  $hook  = bs_ebook_hook();
  $parts = preg_split('/(<\/p>)/i', $content, -1, PREG_SPLIT_DELIM_CAPTURE);
  $count = 0; $out = ''; $done = false;
  foreach ($parts as $p) {
    $out .= $p;
    if (strcasecmp($p, '</p>') === 0) {
      $count++;
      if ($count === 4 && !$done) { $out .= $hook; $done = true; }
    }
  }
  if (!$done) $out .= $hook; // fewer than 4 paragraphs — append at end
  return $out;
}

/* ---------- 2. Auto internal linking (SEO) ---------- */
function bs_autolink_map(){
  return array(
    'jadual imunisasi bayi'   => '/alat/jadual-imunisasi/',
    'jadual imunisasi'        => '/alat/jadual-imunisasi/',
    'tarikh jangka bersalin'  => '/alat/kalkulator-tarikh-bersalin/',
    'kehamilan minggu demi minggu' => '/kehamilan-mingguan/',
    'perkembangan bayi dalam kandungan' => '/kehamilan-mingguan/',
    'nama bayi'               => '/alat/nama-bayi/',
    'berat badan bayi'        => '/alat/berat-bayi/',
    'kenaikan berat masa hamil' => '/alat/kalkulator-berat-kehamilan/',
    'masa subur'              => '/alat/kalkulator-ovulasi/',
    'ovulasi'                 => '/alat/kalkulator-ovulasi/',
    'milestone bayi'          => '/alat/milestone-bayi/',
    'perkembangan bayi ikut umur' => '/alat/milestone-bayi/',
    'kuantiti susu bayi'      => '/alat/kuantiti-susu-bayi/',
    'kos bersalin'            => '/alat/kos-bersalin/',
    'hospital bag'            => '/hospital-bag-bersalin-checklist/',
    'berpantang'              => '/panduan-berpantang-44-hari/',
    'morning sickness'        => '/morning-sickness-trimester-pertama/',
    'kolik'                   => '/kolik-bayi-cara-tenangkan/',
    'jaundis'                 => '/jaundis-kuning-bayi/',
    'MPASI'                   => '/menu-mpasi-bayi-6-bulan/',
    'susu formula'            => '/cara-pilih-susu-formula-bayi/',
  );
}

add_filter('the_content', 'bs_auto_link', 20);
function bs_auto_link($content){
  if (!is_singular('post') || !in_the_loop() || !is_main_query()) return $content;
  if (stripos($content, '<p') === false) return $content;

  $current = untrailingslashit((string) wp_parse_url(get_permalink(), PHP_URL_PATH));
  $doc = new DOMDocument();
  libxml_use_internal_errors(true);
  $ok = $doc->loadHTML('<?xml encoding="UTF-8"><div id="bsroot">' . $content . '</div>', LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
  libxml_clear_errors();
  if (!$ok) return $content;
  $xp = new DOMXPath($doc);
  $root = $xp->query('//div[@id="bsroot"]')->item(0);
  if (!$root) return $content;

  $made = 0; $used = array();
  foreach (bs_autolink_map() as $kw => $path) {
    if ($made >= 4) break;
    if (isset($used[$path]) || untrailingslashit($path) === $current) continue;
    $nodes = $xp->query('.//p//text()[not(ancestor::a)] | .//li//text()[not(ancestor::a)]', $root);
    foreach ($nodes as $node) {
      $text = $node->nodeValue;
      $pos = mb_stripos($text, $kw);
      if ($pos === false) continue;
      $before = mb_substr($text, 0, $pos);
      $match  = mb_substr($text, $pos, mb_strlen($kw));
      $after  = mb_substr($text, $pos + mb_strlen($kw));
      $a = $doc->createElement('a');
      $a->setAttribute('href', home_url($path));
      $a->setAttribute('class', 'bs-auto-link');
      $a->appendChild($doc->createTextNode($match));
      $parent = $node->parentNode;
      if ($before !== '') $parent->insertBefore($doc->createTextNode($before), $node);
      $parent->insertBefore($a, $node);
      if ($after !== '') $parent->insertBefore($doc->createTextNode($after), $node);
      $parent->removeChild($node);
      $made++; $used[$path] = 1;
      break;
    }
  }
  if ($made === 0) return $content;
  $html = '';
  foreach ($root->childNodes as $child) { $html .= $doc->saveHTML($child); }
  return $html;
}

/* ---------- 2b. Slide-in capture pada artikel ---------- */
add_action('wp_footer', function(){
  if (!is_singular('post')) return;
  echo '<aside class="bs-slidein" id="bs-slidein" hidden aria-label="Langgan surat berita">'
    . '<button class="bs-slidein__close" type="button" aria-label="Tutup">×</button>'
    . '<p class="bs-slidein__title">📘 Ebook Kehamilan PERCUMA</p>'
    . '<p class="bs-slidein__desc">73 muka surat — tanda awal hamil hingga bersalin. Masukkan e-mel, terus dapat.</p>'
    . '<form class="newsletter__form bs-sub-form" data-nonce="' . esc_attr(wp_create_nonce('bs_sub')) . '" data-ajax="' . esc_url(admin_url('admin-ajax.php')) . '">'
    . '<input type="email" name="email" required placeholder="E-mel anda" aria-label="E-mel">'
    . '<input type="text" name="website" class="bs-hp" tabindex="-1" autocomplete="off" aria-hidden="true">'
    . '<input type="hidden" name="src" value="slidein-artikel">'
    . '<button class="btn btn--primary" type="submit">Dapatkan Percuma</button></form>'
    . '<div class="bs-sub-msg" role="status"></div>'
    . '<div class="bs-sub-gift" hidden><a class="bs-gift-link bs-ebook-dl" href="#" target="_blank" rel="noopener">📘 Muat Turun Ebook (PDF) ↓</a></div>'
    . '</aside>';
}, 60);

/* ---------- 3. Google Analytics 4 (set option bs_ga4_id, e.g. G-XXXXXXX) ---------- */
add_action('wp_head', function(){
  $id = trim(get_option('bs_ga4_id', ''));
  if (!$id || is_user_logged_in()) return;
  echo "\n<script async src=\"https://www.googletagmanager.com/gtag/js?id=" . esc_attr($id) . "\"></script>\n";
  echo "<script>window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag('js',new Date());gtag('config','" . esc_js($id) . "');</script>\n";
}, 8);