<?php
declare(strict_types=1);
/** Pure patch functions: fail closed on unknown structures; no writes here. */
function pv175_once(string $content,string $needle,string $replace,string $label):string {
    if(substr_count($content,$needle)!==1) throw new RuntimeException('Nie znaleziono jednoznacznego wzorca: '.$label.'. Nie nadpisano plików.');
    return str_replace($needle,$replace,$content);
}
function pv175_patch_reservations(string $content):string {
    if (str_contains($content,'POLANA_V175_RESERVATIONS')) return $content;
    $content=pv175_once($content,'function reservation_validate_public_input(array $input): array','/* POLANA_V175_RESERVATIONS */' . "\n" . "require_once __DIR__.'/polana_v175_booking.php';\n\nfunction reservation_validate_public_input(array \$input): array",'reservation_validate_public_input');
    $needle="    return [\n        'errors' => \$errors,";
    $insert="    /* POLANA_V175_SERVER_VALIDATION — no bypass by manual POST */\n    \$slotCheck = pv175_validate_slot(\$date, \$time);\n    if (!\$slotCheck['ok']) \$errors[] = \$slotCheck['message'];\n\n".$needle;
    $content=pv175_once($content,$needle,$insert,'return validation errors');
    // Restrict each replacement to the appropriate function to avoid touching SMTP tests.
    $adminNeedle="reservation_email_html('Nowa rezerwacja', \$body)";
    $content=pv175_once($content,$adminNeedle,"pv175_email_html('Nowa rezerwacja', \$body, \$reservation, 'admin')",'admin reservation email');
    $guestNeedle='reservation_email_html($subject, $body)';
    $content=pv175_once($content,$guestNeedle,'pv175_email_html($subject, $body, $reservation, $kind)','guest reservation email');
    // Also cover installations where V17.2 Reply-To was not installed yet.
    $withoutReply = "        pv175_email_html(\$subject, \$body, \$reservation, \$kind),\n        \$body\n    );";
    $withReply = "        pv175_email_html(\$subject, \$body, \$reservation, \$kind),\n        \$body,\n        trim(reservation_setting('reservation_admin_email')) ?: null\n    );";
    if (str_contains($content, $withoutReply)) {
        $content=pv175_once($content,$withoutReply,$withReply,'guest Reply-To');
    }
    return $content;
}
function pv175_patch_rezerwacja(string $content):string {
    if(str_contains($content,'POLANA_V175_PUBLIC_HOURS')) return $content;
    $pattern='~<label>\s*Godzina\s*<input\b[^>]*\btype="time"\b[^>]*\bname="reservation_time"\b[^>]*>\s*</label>~s';
    // More tolerant attribute matching: \b after a closing quote is not guaranteed.
    $pattern='~<label>\s*Godzina\s*<input\s+type="time"\s+name="reservation_time".*?\s*>\s*</label>~s';
    if(preg_match_all($pattern,$content,$matches)!==1) throw new RuntimeException('Nie znaleziono jednoznacznego pola godziny w rezerwacja.php. Nie nadpisano plików.');
    $original=$matches[0][0];
    $replacement=<<<'TPL'
<!-- POLANA_V175_PUBLIC_HOURS -->
<?php if (pv175_enabled()): ?>
  <label>
    Godzina
    <select name="reservation_time" id="pv175-time" required aria-describedby="pv175-hint">
      <option value="">Najpierw wybierz datę</option>
    </select>
    <small id="pv175-hint" style="display:block;color:#666;margin-top:5px">Wybierz datę, aby zobaczyć dostępne godziny.</small>
  </label>
<?php else: ?>
TPL;
    $replacement.="\n".$original."\n<?php endif; ?>";
    $content=pv175_once($content,$original,$replacement,'reservation time input');
    $script=<<<'SCRIPT'
<!-- POLANA_V175_PUBLIC_HOURS_SCRIPT -->
<?php if (pv175_enabled()): ?>
<script>
(function(){
  const dateInput=document.querySelector('input[name="reservation_date"]');
  const timeSelect=document.getElementById('pv175-time');
  const hint=document.getElementById('pv175-hint');
  if(!dateInput||!timeSelect||!hint)return;
  const selectedOnSubmit=<?= json_encode((string)($_POST['reservation_time']??''), JSON_HEX_TAG|JSON_HEX_AMP|JSON_HEX_APOS|JSON_HEX_QUOT) ?>;
  let requestNo=0;
  async function refresh(){
    const id=++requestNo;
    timeSelect.replaceChildren(new Option('Sprawdzam dostępne godziny…',''));
    timeSelect.disabled=true;
    if(!dateInput.value){timeSelect.replaceChildren(new Option('Najpierw wybierz datę',''));hint.textContent='Wybierz datę.';return;}
    try{
      const response=await fetch('/polana-rezerwacje-godziny.php?date='+encodeURIComponent(dateInput.value),{credentials:'same-origin',cache:'no-store'});
      if(!response.ok)throw new Error('Błąd sprawdzania godzin');
      const data=await response.json();
      if(id!==requestNo)return;
      timeSelect.replaceChildren(new Option(data.slots?.length?'Wybierz godzinę':'Brak dostępnych godzin',''));
      for(const slot of (data.slots||[]))timeSelect.add(new Option(slot,slot));
      const oldValue=(id===1?selectedOnSubmit:'');
      if(oldValue&&data.slots.includes(oldValue))timeSelect.value=oldValue;
      timeSelect.disabled=!data.slots?.length;
      hint.textContent=data.message||'';
      hint.style.color=data.slots?.length?'#566a56':'#9a442f';
    }catch(err){
      if(id!==requestNo)return;
      timeSelect.replaceChildren(new Option('Nie można sprawdzić godzin',''));
      timeSelect.disabled=true;
      hint.textContent='Nie udało się pobrać godzin. Odśwież stronę i spróbuj ponownie.';
      hint.style.color='#9a442f';
    }
  }
  dateInput.addEventListener('change',refresh);
  refresh();
})();
</script>
<?php endif; ?>
SCRIPT;
    $content=pv175_once($content,'</main>',"</main>\n".$script,'public page main closing');
    return $content;
}
function pv175_patch_settings(string $content):string {
    if(str_contains($content,'POLANA_V175_SETTINGS_LINK')) return $content;
    $needle='<form class="form-card form-grid" method="post">';
    if(substr_count($content,$needle)<1) return $content;
    $link='<div class="form-card" style="margin-bottom:18px;padding:18px"><strong>Godziny rezerwacji i wygląd e-maili</strong><p style="margin:7px 0 12px">Ustaw dni otwarcia, zablokuj niedostępne godziny i zobacz podgląd autoresponderów.</p><a class="btn btn-primary" href="/admin/polana-godziny-rezerwacji.php">Otwórz godziny i wiadomości →</a></div>';
    $pos=strpos($content,$needle);
    return substr_replace($content,"<!-- POLANA_V175_SETTINGS_LINK -->\n".$link."\n",$pos,0);
}
function pv175_patch_nav(string $content):string {
    if(str_contains($content,'POLANA_V175_NAV')) return $content;
    $needle='<a href="/admin/">Pulpit</a>';
    if(substr_count($content,$needle)!==1) return $content;
    $extra="\n        <!-- POLANA_V175_NAV -->\n        <?php if (\$role === 'admin'): ?><a href=\"/admin/polana-godziny-rezerwacji.php\">Godziny rezerwacji</a><?php endif; ?>";
    return str_replace($needle,$needle.$extra,$content);
}
function pv175_patch(string $relative,string $content):string {
    return match($relative) {
        'includes/reservations.php'=>pv175_patch_reservations($content),
        'rezerwacja.php'=>pv175_patch_rezerwacja($content),
        'admin/reservation-settings.php'=>pv175_patch_settings($content),
        'includes/functions.php'=>pv175_patch_nav($content),
        default=>throw new RuntimeException('Nieobsługiwany plik: '.$relative),
    };
}