<?php
require_once __DIR__ . '/../includes/bootstrap.php';
require_once __DIR__ . '/_ui.php';
$staff = require_admin_or_permission('manage_business_hours');
$pdo = get_db();

$weekdayNames = [1 => 'Montag', 2 => 'Dienstag', 3 => 'Mittwoch', 4 => 'Donnerstag', 5 => 'Freitag', 6 => 'Samstag', 0 => 'Sonntag'];
$weekdayOrder = [1, 2, 3, 4, 5, 6, 0];

$errors = [];

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    verify_csrf();
    $action = $_POST['action'] ?? '';

    if ($action === 'save_hours') {
        $enabled = !empty($_POST['business_hours_enabled']) ? '1' : '0';
        set_setting('business_hours_enabled', $enabled);

        $stmt = $pdo->prepare('UPDATE business_hours SET is_open=?, open_time=?, close_time=? WHERE weekday=?');
        foreach ($weekdayOrder as $wd) {
            $isOpen = !empty($_POST["open_{$wd}"]) ? 1 : 0;
            $openTime = trim($_POST["from_{$wd}"] ?? '09:00') . ':00';
            $closeTime = trim($_POST["to_{$wd}"] ?? '17:00') . ':00';
            $stmt->execute([$isOpen, $openTime, $closeTime, $wd]);
        }
        audit_log($staff['id'], 'Geschäftszeiten aktualisiert');
        flash('success', 'Geschäftszeiten gespeichert.');
        redirect('/staff/business_hours.php');
    }

    if ($action === 'add_holiday') {
        $date = trim($_POST['holiday_date'] ?? '');
        $name = trim($_POST['holiday_name'] ?? '');
        if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $date)) {
            $errors[] = 'Bitte ein gültiges Datum angeben.';
        } elseif ($name === '') {
            $errors[] = 'Bitte einen Namen für den Feiertag angeben.';
        } else {
            $pdo->prepare('INSERT INTO business_holidays (holiday_date, name) VALUES (?,?)')->execute([$date, $name]);
            audit_log($staff['id'], "Feiertag hinzugefügt: {$name} ({$date})");
            flash('success', 'Feiertag hinzugefügt.');
            redirect('/staff/business_hours.php?tab=holidays');
        }
    }

    if ($action === 'delete_holiday') {
        $id = (int) $_POST['id'];
        $pdo->prepare('DELETE FROM business_holidays WHERE id = ?')->execute([$id]);
        redirect('/staff/business_hours.php?tab=holidays');
    }

    if ($action === 'import_holidays') {
        $stateCode = $_POST['state_code'] ?? '';
        $importYear = (int) ($_POST['import_year'] ?? 0);
        if (!isset(GERMAN_STATE_NAMES[$stateCode])) {
            $errors[] = 'Bitte ein gültiges Bundesland auswählen.';
        } elseif ($importYear < 2000 || $importYear > 2100) {
            $errors[] = 'Bitte ein gültiges Jahr auswählen.';
        } else {
            $newHolidays = german_public_holidays($stateCode, $importYear);
            $existingDates = array_flip($pdo->query('SELECT holiday_date FROM business_holidays')->fetchAll(PDO::FETCH_COLUMN));
            $insertStmt = $pdo->prepare('INSERT INTO business_holidays (holiday_date, name) VALUES (?,?)');
            $added = 0;
            $skipped = 0;
            foreach ($newHolidays as $h) {
                if (isset($existingDates[$h['date']])) { $skipped++; continue; }
                $insertStmt->execute([$h['date'], $h['name']]);
                $existingDates[$h['date']] = true;
                $added++;
            }
            $stateName = GERMAN_STATE_NAMES[$stateCode];
            audit_log($staff['id'], "Feiertage {$importYear} für {$stateName} importiert ({$added} hinzugefügt, {$skipped} bereits vorhanden)");
            flash('success', "{$added} Feiertag(e) für {$stateName} {$importYear} hinzugefügt" . ($skipped ? ", {$skipped} waren bereits vorhanden." : '.'));
            redirect('/staff/business_hours.php?tab=holidays');
        }
    }
}

$hoursEnabled = get_setting('business_hours_enabled', '0') === '1';
$hoursByWeekday = [];
foreach ($pdo->query('SELECT * FROM business_hours')->fetchAll() as $r) $hoursByWeekday[(int) $r['weekday']] = $r;
$holidays = $pdo->query('SELECT * FROM business_holidays ORDER BY holiday_date')->fetchAll();

$pageTitle = 'Geschäftszeiten';
$activePage = 'business_hours';
require __DIR__ . '/_header.php';
?>

<h1>Geschäftszeiten</h1>
<p class="muted">Legt fest, innerhalb welcher Zeiten die SLA-Fristen (Reaktion/Lösung) laufen. Bei deaktivierten Geschäftszeiten gelten die Fristen wie bisher rund um die Uhr. <strong>Achtung:</strong> Wenige Stunden pro Tag (z. B. nur abends) lassen die Fälligkeit in <a href="/staff/priorities.php">Prioritäten &amp; SLA-Zeiten</a> entsprechend weiter in die Zukunft rücken – eine 72-Std-Lösungsfrist kann bei 3 offenen Stunden/Tag mehrere Wochen dauern.</p>

<?php foreach ($errors as $err): ?>
  <div class="flash error"><?= e($err) ?></div>
<?php endforeach; ?>

<?php
  $startTab = (($_GET['tab'] ?? '') === 'holidays' || in_array($_POST['action'] ?? '', ['add_holiday', 'import_holidays'], true)) ? 'holidays' : 'hours';
?>
<div class="card" style="padding:0">
<?php ui_tab_bar(['hours' => 'Wochenzeiten', 'holidays' => 'Feiertage (' . count($holidays) . ')']); ?>

<div class="tab-pane" data-pane="hours" style="padding:16px 20px">
  <h3 style="margin-top:0">Öffnungszeiten je Wochentag</h3>
  <form method="post">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="save_hours">

    <label style="display:flex; align-items:center; gap:6px; font-weight:600; margin-bottom:14px">
      <input type="checkbox" name="business_hours_enabled" style="width:auto" <?= $hoursEnabled ? 'checked' : '' ?>>
      Geschäftszeiten für SLA-Berechnung verwenden
    </label>

    <table>
      <thead><tr><th>Tag</th><th>Geöffnet</th><th>Von</th><th>Bis</th></tr></thead>
      <tbody>
        <?php foreach ($weekdayOrder as $wd):
          $h = $hoursByWeekday[$wd] ?? ['is_open' => 0, 'open_time' => '09:00:00', 'close_time' => '17:00:00'];
        ?>
          <tr>
            <td><?= $weekdayNames[$wd] ?></td>
            <td><input type="checkbox" name="open_<?= $wd ?>" style="width:auto" <?= $h['is_open'] ? 'checked' : '' ?>></td>
            <td><input type="time" name="from_<?= $wd ?>" value="<?= substr($h['open_time'], 0, 5) ?>" style="max-width:130px"></td>
            <td><input type="time" name="to_<?= $wd ?>" value="<?= substr($h['close_time'], 0, 5) ?>" style="max-width:130px"></td>
          </tr>
        <?php endforeach; ?>
      </tbody>
    </table>

    <div class="btn-row">
      <button type="submit" class="btn">Änderungen speichern</button>
    </div>
  </form>
</div>

<div class="tab-pane" data-pane="holidays" style="padding:16px 20px;display:none">
  <h3 style="margin-top:0">Feiertage</h3>
  <p class="muted">An diesen Tagen laufen keine SLA-Fristen, unabhängig vom Wochentag.</p>

  <div style="background:var(--primary-lt);border-radius:8px;padding:12px 14px;margin-bottom:14px">
    <form method="post" style="display:flex;gap:8px;align-items:flex-end;flex-wrap:wrap">
      <?= csrf_field() ?>
      <input type="hidden" name="action" value="import_holidays">
      <div>
        <label for="state_code" style="font-size:.78rem;font-weight:600;color:var(--muted);display:block;margin-bottom:3px">Bundesland</label>
        <select id="state_code" name="state_code" required>
          <option value="">– auswählen –</option>
          <?php foreach (GERMAN_STATE_NAMES as $code => $name): ?>
            <option value="<?= e($code) ?>"><?= e($name) ?></option>
          <?php endforeach; ?>
        </select>
      </div>
      <div>
        <label for="import_year" style="font-size:.78rem;font-weight:600;color:var(--muted);display:block;margin-bottom:3px">Jahr</label>
        <select id="import_year" name="import_year" required>
          <?php $curYear = (int) date('Y'); foreach ([$curYear, $curYear + 1, $curYear + 2] as $yr): ?>
            <option value="<?= $yr ?>"><?= $yr ?></option>
          <?php endforeach; ?>
        </select>
      </div>
      <button type="submit" class="btn secondary" style="white-space:nowrap">Feiertage automatisch übernehmen</button>
    </form>
    <p class="muted" style="font-size:.76rem;margin:8px 0 0">Trägt die gesetzlichen Feiertage des gewählten Bundeslandes für das gewählte Jahr ein (inkl. beweglicher Feiertage wie Ostern). Bereits vorhandene Daten werden übersprungen, nichts wird doppelt angelegt.</p>
  </div>

  <table>
    <thead><tr><th>Datum</th><th>Name</th><th></th></tr></thead>
    <tbody>
      <?php foreach ($holidays as $h): ?>
        <tr>
          <td><?= e(date('d.m.Y', strtotime($h['holiday_date']))) ?></td>
          <td><?= e($h['name']) ?></td>
          <td>
            <form method="post" style="display:inline" onsubmit="return confirm('Feiertag entfernen?');">
              <?= csrf_field() ?>
              <input type="hidden" name="action" value="delete_holiday">
              <input type="hidden" name="id" value="<?= $h['id'] ?>">
              <button type="submit" style="background:none;border:none;color:#dc2626;cursor:pointer;padding:0;font-size:.9rem">✕</button>
            </form>
          </td>
        </tr>
      <?php endforeach; ?>
      <?php if (!$holidays): ?>
        <tr><td colspan="3" class="muted">Noch keine Feiertage eingetragen.</td></tr>
      <?php endif; ?>
    </tbody>
  </table>
  <form method="post" style="margin-top:14px">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="add_holiday">
    <label for="holiday_date">Datum</label>
    <input type="date" id="holiday_date" name="holiday_date" required>
    <label for="holiday_name">Name</label>
    <input type="text" id="holiday_name" name="holiday_name" placeholder="z.B. Tag der Deutschen Einheit" required>
    <div class="btn-row">
      <button type="submit" class="btn secondary">Hinzufügen</button>
    </div>
  </form>
</div>

</div>
</div>
<?php ui_tab_assets($startTab); ?>

<?php require __DIR__ . '/_footer.php'; ?>