<?php
require_once __DIR__ . '/../includes/bootstrap.php';
$staff = require_admin_or_permission('manage_automation');
$pdo   = get_db();

$departments = departments_for_select($pdo, array_map('intval', $pdo->query('SELECT department_id FROM recurring_tickets')->fetchAll(PDO::FETCH_COLUMN)));
$priorities  = $pdo->query('SELECT * FROM priorities ORDER BY sort_order')->fetchAll();
$agents      = $pdo->query('SELECT id, name FROM staff WHERE is_active=1 ORDER BY name')->fetchAll();
$errors      = [];

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    verify_csrf();
    $action = $_POST['action'] ?? '';

    if ($action === 'create' || $action === 'update') {
        $subject    = trim($_POST['subject'] ?? '');
        $message    = trim($_POST['message'] ?? '');
        $deptId     = (int) ($_POST['department_id'] ?? 0);
        $prioId     = (int) ($_POST['priority_id'] ?? 0);
        $assignTo   = ($_POST['assigned_staff_id'] ?? '') !== '' ? (int)$_POST['assigned_staff_id'] : null;
        $days       = max(1, (int) ($_POST['interval_days'] ?? 30));
        $nextRun    = trim($_POST['next_run'] ?? date('Y-m-d'));
        $isActive   = !empty($_POST['is_active']) ? 1 : 0;

        if ($subject === '') $errors[] = 'Bitte einen Betreff angeben.';
        if ($message === '') $errors[] = 'Bitte eine Nachricht eingeben.';
        if (!$deptId)        $errors[] = 'Bitte eine Abteilung wählen.';
        if (!$prioId)        $errors[] = 'Bitte eine Priorität wählen.';

        if (!$errors) {
            if ($action === 'create') {
                $pdo->prepare('INSERT INTO recurring_tickets (subject,message,department_id,priority_id,assigned_staff_id,interval_days,next_run,is_active,created_by,created_at) VALUES (?,?,?,?,?,?,?,?,?,?)')
                    ->execute([$subject, $message, $deptId, $prioId, $assignTo, $days, $nextRun, $isActive, $staff['id'], db_now()]);
                audit_log($staff['id'], "Wiederkehrendes Ticket erstellt: {$subject}");
                flash('success', 'Wiederkehrendes Ticket erstellt.');
            } else {
                $id = (int) $_POST['id'];
                $pdo->prepare('UPDATE recurring_tickets SET subject=?,message=?,department_id=?,priority_id=?,assigned_staff_id=?,interval_days=?,next_run=?,is_active=? WHERE id=?')
                    ->execute([$subject, $message, $deptId, $prioId, $assignTo, $days, $nextRun, $isActive, $id]);
                audit_log($staff['id'], "Wiederkehrendes Ticket bearbeitet: {$subject}");
                flash('success', 'Gespeichert.');
            }
            redirect('/staff/recurring_tickets.php');
        }
    }

    if ($action === 'delete') {
        $id = (int) $_POST['id'];
        $pdo->prepare('DELETE FROM recurring_tickets WHERE id=?')->execute([$id]);
        audit_log($staff['id'], 'Wiederkehrendes Ticket gelöscht');
        flash('success', 'Gelöscht.');
        redirect('/staff/recurring_tickets.php');
    }

    if ($action === 'toggle') {
        $id = (int) $_POST['id'];
        $pdo->prepare('UPDATE recurring_tickets SET is_active = 1 - is_active WHERE id=?')->execute([$id]);
        redirect('/staff/recurring_tickets.php');
    }

    if ($action === 'run_now') {
        $id = (int) $_POST['id'];
        $rt = $pdo->prepare('SELECT * FROM recurring_tickets WHERE id=?');
        $rt->execute([$id]); $rt = $rt->fetch();
        if ($rt) {
            $tn = generate_ticket_number();
            $now = db_now();
            $nextRun = (new DateTimeImmutable('today'))
                ->modify('+' . (int) $rt['interval_days'] . ' days')
                ->format('Y-m-d');
            try {
                $pdo->beginTransaction();
                $pdo->prepare(
                    'INSERT INTO tickets (ticket_number,subject,requester_name,requester_email,department_id,priority_id,assigned_staff_id,status,source,created_at,updated_at)
                     VALUES (?,?,?,?,?,?,?,\'open\',\'staff\',?,?)'
                )->execute([$tn, $rt['subject'], 'System', 'system@recurring', $rt['department_id'], $rt['priority_id'], $rt['assigned_staff_id'], $now, $now]);
                $ticketId = (int) $pdo->lastInsertId();
                $pdo->prepare('INSERT INTO ticket_threads (ticket_id,author_type,staff_id,message,is_internal_note,created_at) VALUES (?,\'staff\',?,?,0,?)')
                    ->execute([$ticketId, $staff['id'], $rt['message'], $now]);
                $pdo->prepare('UPDATE recurring_tickets SET next_run = ? WHERE id = ?')
                    ->execute([$nextRun, $id]);
                $pdo->commit();
            } catch (Throwable $e) {
                if ($pdo->inTransaction()) {
                    $pdo->rollBack();
                }
                throw $e;
            }
            flash('success', "Ticket #{$tn} sofort erstellt.");
        }
        redirect('/staff/recurring_tickets.php');
    }
}

$items = $pdo->query(
    'SELECT rt.*, d.name AS dept_name, p.name AS prio_name, s.name AS agent_name
     FROM recurring_tickets rt
     JOIN departments d ON d.id=rt.department_id
     JOIN priorities p ON p.id=rt.priority_id
     LEFT JOIN staff s ON s.id=rt.assigned_staff_id
     ORDER BY rt.next_run ASC'
)->fetchAll();

$editing = null;
if (!empty($_GET['edit'])) {
    $stmt = $pdo->prepare('SELECT * FROM recurring_tickets WHERE id=?');
    $stmt->execute([(int)$_GET['edit']]);
    $editing = $stmt->fetch();
}

$pageTitle  = 'Wiederkehrende Tickets';
$activePage = 'recurring';
require __DIR__ . '/_header.php';
?>

<div class="topbar">
  <h1>Wiederkehrende Tickets</h1>
  <div class="btn-row">
    <a href="?new=1" class="btn">+ Neues Muster</a>
  </div>
</div>
<p class="muted">Tickets die automatisch nach einem festen Intervall neu erstellt werden (z.B. monatliche Wartung). Erstellung per Cronjob: <code>php cron/process_recurring.php</code></p>

<?php foreach ($errors as $e): ?><div class="flash error"><?= e($e) ?></div><?php endforeach; ?>

<?php if (!empty($_GET['new']) || $editing): ?>
<div class="card">
  <h3><?= $editing ? 'Muster bearbeiten' : 'Neues Muster' ?></h3>
  <form method="post">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="<?= $editing ? 'update' : 'create' ?>">
    <?php if ($editing): ?><input type="hidden" name="id" value="<?= $editing['id'] ?>"><?php endif; ?>

    <label>Betreff</label>
    <input type="text" name="subject" value="<?= e($editing['subject'] ?? '') ?>" required>

    <label>Nachricht (erster Thread-Eintrag)</label>
    <textarea name="message" rows="5" required><?= e($editing['message'] ?? '') ?></textarea>

    <div class="field-row">
      <div>
        <label>Abteilung</label>
        <select name="department_id" required>
          <?php foreach ($departments as $d): ?>
            <option value="<?= $d['id'] ?>" <?= ($editing['department_id'] ?? '') == $d['id'] ? 'selected' : '' ?>><?= e($d['name']) ?></option>
          <?php endforeach; ?>
        </select>
      </div>
      <div>
        <label>Priorität</label>
        <select name="priority_id" required>
          <?php foreach ($priorities as $p): ?>
            <option value="<?= $p['id'] ?>" <?= ($editing['priority_id'] ?? '') == $p['id'] ? 'selected' : '' ?>><?= e($p['name']) ?></option>
          <?php endforeach; ?>
        </select>
      </div>
    </div>

    <div class="field-row">
      <div>
        <label>Zugewiesen an (optional)</label>
        <select name="assigned_staff_id">
          <option value="">– nicht zugewiesen –</option>
          <?php foreach ($agents as $a): ?>
            <option value="<?= $a['id'] ?>" <?= ($editing['assigned_staff_id'] ?? '') == $a['id'] ? 'selected' : '' ?>><?= e($a['name']) ?></option>
          <?php endforeach; ?>
        </select>
      </div>
      <div>
        <label>Intervall (Tage)</label>
        <input type="number" name="interval_days" min="1" value="<?= e($editing['interval_days'] ?? 30) ?>" required>
      </div>
      <div>
        <label>Nächste Ausführung</label>
        <input type="date" name="next_run" value="<?= e($editing['next_run'] ?? date('Y-m-d')) ?>" required>
      </div>
    </div>

    <label style="display:flex; align-items:center; gap:8px; margin-top:12px">
      <input type="checkbox" name="is_active" style="width:auto" <?= ($editing['is_active'] ?? 1) ? 'checked' : '' ?>>
      Aktiv
    </label>

    <div class="btn-row" style="margin-top:16px">
      <button type="submit" class="btn">Speichern</button>
      <a href="/staff/recurring_tickets.php" class="btn secondary">Abbrechen</a>
    </div>
  </form>
</div>
<?php endif; ?>

<div class="card">
  <?php if (!$items): ?>
    <div class="empty-state">Noch keine Muster angelegt.</div>
  <?php else: ?>
  <table>
    <thead><tr><th>Betreff</th><th>Abteilung</th><th>Intervall</th><th>Nächste Ausführung</th><th>Status</th><th></th></tr></thead>
    <tbody>
      <?php foreach ($items as $rt): ?>
        <tr>
          <td><strong><?= e($rt['subject']) ?></strong><br><span class="muted" style="font-size:.78rem"><?= e($rt['agent_name'] ?? '–') ?></span></td>
          <td><?= e($rt['dept_name']) ?></td>
          <td>Alle <?= $rt['interval_days'] ?> Tage</td>
          <td class="<?= $rt['next_run'] <= date('Y-m-d') ? 'muted' : '' ?>"><?= e($rt['next_run']) ?></td>
          <td><span class="badge" style="background:<?= $rt['is_active'] ? '#16a34a' : '#6b7280' ?>"><?= $rt['is_active'] ? 'Aktiv' : 'Pausiert' ?></span></td>
          <td style="white-space:nowrap">
            <a href="?edit=<?= $rt['id'] ?>" class="btn secondary" style="font-size:.78rem; padding:4px 10px">Bearbeiten</a>
            <form method="post" style="display:inline">
              <?= csrf_field() ?>
              <input type="hidden" name="action" value="toggle">
              <input type="hidden" name="id" value="<?= $rt['id'] ?>">
              <button type="submit" class="btn secondary" style="font-size:.78rem; padding:4px 10px"><?= $rt['is_active'] ? 'Pausieren' : 'Aktivieren' ?></button>
            </form>
            <form method="post" style="display:inline">
              <?= csrf_field() ?>
              <input type="hidden" name="action" value="run_now">
              <input type="hidden" name="id" value="<?= $rt['id'] ?>">
              <button type="submit" class="btn secondary" style="font-size:.78rem; padding:4px 10px" title="Jetzt sofort ein Ticket erstellen">▶ Jetzt</button>
            </form>
            <form method="post" style="display:inline" onsubmit="return confirm('Wirklich löschen?')">
              <?= csrf_field() ?>
              <input type="hidden" name="action" value="delete">
              <input type="hidden" name="id" value="<?= $rt['id'] ?>">
              <button type="submit" style="background:none;border:1.5px solid var(--danger);color:var(--danger);border-radius:var(--radius);padding:4px 10px;font-size:.78rem;cursor:pointer">Löschen</button>
            </form>
          </td>
        </tr>
      <?php endforeach; ?>
    </tbody>
  </table>
  <?php endif; ?>
</div>

<?php require __DIR__ . '/_footer.php'; ?>