<?php
require_once __DIR__ . '/../includes/bootstrap.php';
require_once __DIR__ . '/_ui.php';
$staff = require_staff_login();
if (!has_permission($staff, 'view_reports')) {
    flash('error', 'Für Berichte fehlt die erforderliche Berechtigung.');
    redirect('/staff/dashboard.php');
}
$pdo = get_db();
$scope = staff_department_ids($staff); // null = alle Abteilungen

$dimensions = report_dimensions($pdo);
$metrics = report_metrics($pdo);

// ── Gespeicherte Berichte ───────────────────────────────────────────────────
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    verify_csrf();
    $action = $_POST['action'] ?? '';
    if ($action === 'save') {
        $name = trim($_POST['report_name'] ?? '');
        if ($name === '') {
            flash('error', 'Bitte einen Namen für den Bericht angeben.');
        } else {
            parse_str((string) ($_POST['return_query'] ?? ''), $cfgIn);
            $cfg = report_clean_config($pdo, $cfgIn);
            $now = db_now();
            $pdo->prepare('INSERT INTO saved_reports (staff_id, name, config, is_shared, created_at, updated_at) VALUES (?,?,?,?,?,?)')
                ->execute([$staff['id'], mb_substr($name, 0, 120), json_encode($cfg, JSON_UNESCAPED_UNICODE), !empty($_POST['shared']) ? 1 : 0, $now, $now]);
            flash('success', 'Bericht gespeichert.');
        }
        redirect('/staff/report_builder.php?' . ltrim((string) ($_POST['return_query'] ?? ''), '?'));
    }
    if ($action === 'delete') {
        $row = $pdo->prepare('SELECT * FROM saved_reports WHERE id = ?');
        $row->execute([(int) $_POST['id']]);
        if (($r = $row->fetch()) && ((int) $r['staff_id'] === (int) $staff['id'] || $staff['role'] === 'admin')) {
            $pdo->prepare('DELETE FROM saved_reports WHERE id = ?')->execute([$r['id']]);
            $pdo->prepare('DELETE FROM report_schedules WHERE report_id = ?')->execute([$r['id']]);
            flash('success', 'Bericht gelöscht.');
        }
        redirect('/staff/report_builder.php');
    }
    if (in_array($action, ['schedule_add', 'schedule_delete', 'schedule_toggle', 'schedule_test', 'schedule_flag'], true)) {
        $sid = (int) ($_POST['schedule_id'] ?? 0);
        $own = $pdo->prepare('SELECT * FROM report_schedules WHERE id = ?');
        $own->execute([$sid]);
        $sch = $own->fetch();
        $mine = $sch && ((int) $sch['staff_id'] === (int) $staff['id'] || $staff['role'] === 'admin');
        if ($action === 'schedule_add') {
            $err = report_schedule_create($pdo, $staff, $_POST);
            $err ? flash('error', $err) : flash('success', 'Zeitplan angelegt. Der Bericht wird zum nächsten Termin per E-Mail gesendet.');
        } elseif (!$mine) {
            flash('error', 'Zeitplan nicht gefunden.');
        } elseif ($action === 'schedule_delete') {
            $pdo->prepare('DELETE FROM report_schedules WHERE id = ?')->execute([$sid]);
            flash('success', 'Zeitplan gelöscht.');
        } elseif ($action === 'schedule_flag') {
            $flag = (string) ($_POST['flag'] ?? '');
            if (!in_array($flag, ['only_if_data', 'skip_unchanged', 'weekdays_only'], true)) { flash('error', 'Unbekannte Option.'); }
            else {
                $new = (int) $sch[$flag] === 1 ? 0 : 1;
                $upd = $sch; $upd[$flag] = $new;
                $pdo->prepare("UPDATE report_schedules SET {$flag} = ?, next_run_at = ? WHERE id = ?")->execute([$new, (int) $sch['enabled'] === 1 ? report_schedule_next($upd) : $sch['next_run_at'], $sid]);
                flash('success', 'Option gespeichert.');
            }
        } elseif ($action === 'schedule_toggle') {
            $on = (int) $sch['enabled'] === 1 ? 0 : 1;
            $pdo->prepare('UPDATE report_schedules SET enabled = ?, next_run_at = ? WHERE id = ?')->execute([$on, $on ? report_schedule_next($sch) : $sch['next_run_at'], $sid]);
            flash('success', $on ? 'Zeitplan aktiviert.' : 'Zeitplan pausiert.');
        } else {
            $r = report_schedule_send($pdo, $sch);
            $r['error'] ? flash('error', $r['error']) : flash('success', 'Testversand an ' . $r['sent'] . ' Empfänger gesendet.');
        }
        redirect('/staff/report_builder.php#versand');
    }
}

// ── Konfiguration: aus gespeichertem Bericht oder aus der URL ───────────────
$saved = $pdo->prepare('SELECT r.*, s.name AS owner FROM saved_reports r LEFT JOIN staff s ON s.id = r.staff_id WHERE r.staff_id = ? OR r.is_shared = 1 ORDER BY r.name');
$saved->execute([$staff['id']]);
$savedReports = $saved->fetchAll();
$schedStmt = $pdo->prepare("SELECT sc.*, r.name AS report_name FROM report_schedules sc JOIN saved_reports r ON r.id = sc.report_id WHERE sc.staff_id = ? OR ? = 'admin' ORDER BY r.name, sc.id");
$schedStmt->execute([$staff['id'], $staff['role']]);
$schedules = $schedStmt->fetchAll();
$ownReports = array_values(array_filter($savedReports, fn($r) => (int) $r['staff_id'] === (int) $staff['id'] || $staff['role'] === 'admin'));
$cfgIn = $_GET;
if (isset($_GET['saved'])) {
    foreach ($savedReports as $sr) {
        if ((int) $sr['id'] === (int) $_GET['saved']) { $cfgIn = json_decode($sr['config'], true) ?: []; break; }
    }
}
$cfg = report_clean_config($pdo, $cfgIn);
$report = report_run($pdo, $cfg, $scope);

$queryOf = fn(array $c) => http_build_query([
    'dimension' => $c['dimension'], 'from' => $c['from'], 'to' => $c['to'], 'sort' => $c['sort'], 'desc' => $c['desc'] ? 1 : 0,
    'metrics' => $c['metrics'], 'filters' => $c['filters'],
]);

if (($_GET['export'] ?? '') === 'csv') {
    header('Content-Type: text/csv; charset=utf-8');
    header('Content-Disposition: attachment; filename="bericht-' . $cfg['dimension'] . '-' . $cfg['from'] . '_' . $cfg['to'] . '.csv"');
    echo report_to_csv($report);
    exit;
}

$departments = $pdo->query('SELECT id, name FROM departments ORDER BY name')->fetchAll();
$priorities = $pdo->query('SELECT id, name FROM priorities ORDER BY sort_order')->fetchAll();
$agents = $pdo->query('SELECT id, name FROM staff WHERE is_active = 1 ORDER BY name')->fetchAll();
$topics = help_topic_options($pdo, false, false);
$fmtValue = function ($v, string $unit) {
    if ($v === null) return '–';
    return ($unit === '%' || $unit === 'Std' ? number_format((float) $v, 1, ',', '.') : (string) $v) . ($unit === '%' ? ' %' : ($unit === 'Std' ? ' Std' : ''));
};
$maxByMetric = [];
foreach (array_slice($report['columns'], 1) as $c) $maxByMetric[$c['key']] = max(1, ...array_map(fn($r) => (float) ($r[$c['key']] ?? 0), $report['rows'] ?: [[$c['key'] => 0]]));

$pageTitle = 'Bericht-Baukasten';
$activePage = 'report_builder';
require __DIR__ . '/_header.php';
?>

<div style="display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap">
  <h1 style="margin:0">Bericht-Baukasten</h1>
  <div style="display:flex;gap:8px">
    <a href="/staff/reports.php" class="btn secondary">Standard-Berichte</a>
    <a href="/staff/report_builder.php?<?= e($queryOf($cfg)) ?>&export=csv" class="btn secondary">CSV exportieren</a>
  </div>
</div>
<p class="muted">Wähle Gruppierung, Kennzahlen, Zeitraum und Filter – nach dem Erstellungsdatum der Tickets. Berichte lassen sich speichern und mit allen teilen.</p>

<?php if ($savedReports): ?>
<div class="card" style="padding:10px 14px;margin-bottom:12px">
  <div style="display:flex;align-items:center;gap:8px;flex-wrap:wrap">
    <strong style="font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em">Gespeichert</strong>
    <?php foreach ($savedReports as $sr): ?>
      <span style="display:inline-flex;align-items:center;gap:2px">
        <a class="btn secondary" style="padding:3px 12px;font-size:.82rem" href="/staff/report_builder.php?saved=<?= (int) $sr['id'] ?>" title="<?= (int) $sr['staff_id'] === (int) $staff['id'] ? 'Mein Bericht' : 'Geteilt von ' . e($sr['owner'] ?? '') ?>"><?= e($sr['name']) ?><?= $sr['is_shared'] ? ' ⇄' : '' ?></a>
        <?php if ((int) $sr['staff_id'] === (int) $staff['id'] || $staff['role'] === 'admin'): ?>
          <form method="post" style="margin:0" onsubmit="return confirm('Bericht löschen?')"><?= csrf_field() ?><input type="hidden" name="action" value="delete"><input type="hidden" name="id" value="<?= (int) $sr['id'] ?>">
            <button type="submit" title="Löschen" style="background:none;border:none;color:var(--muted);cursor:pointer;padding:0 4px">✕</button></form>
        <?php endif; ?>
      </span>
    <?php endforeach; ?>
  </div>
</div>
<?php endif; ?>

<form method="get" class="card">
  <div style="display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;align-items:end">
    <div><label for="dimension" style="margin-top:0">Gruppieren nach</label>
      <select id="dimension" name="dimension"><?php foreach ($dimensions as $k => $d): ?><option value="<?= e($k) ?>" <?= $cfg['dimension'] === $k ? 'selected' : '' ?>><?= e($d[0]) ?></option><?php endforeach; ?></select></div>
    <div><label for="from" style="margin-top:0">Von</label><input type="date" id="from" name="from" value="<?= e($cfg['from']) ?>"></div>
    <div><label for="to" style="margin-top:0">Bis</label><input type="date" id="to" name="to" value="<?= e($cfg['to']) ?>"></div>
    <div><label for="f_dept" style="margin-top:0">Abteilung</label>
      <select id="f_dept" name="filters[departmentId]"><option value="">Alle</option><?php foreach ($departments as $d): ?><option value="<?= $d['id'] ?>" <?= ($cfg['filters']['departmentId'] ?? '') == $d['id'] ? 'selected' : '' ?>><?= e($d['name']) ?></option><?php endforeach; ?></select></div>
    <div><label for="f_prio" style="margin-top:0">Priorität</label>
      <select id="f_prio" name="filters[priorityId]"><option value="">Alle</option><?php foreach ($priorities as $p): ?><option value="<?= $p['id'] ?>" <?= ($cfg['filters']['priorityId'] ?? '') == $p['id'] ? 'selected' : '' ?>><?= e($p['name']) ?></option><?php endforeach; ?></select></div>
    <div><label for="f_agent" style="margin-top:0">Mitarbeiter</label>
      <select id="f_agent" name="filters[agentId]"><option value="">Alle</option><?php foreach ($agents as $a): ?><option value="<?= $a['id'] ?>" <?= ($cfg['filters']['agentId'] ?? '') == $a['id'] ? 'selected' : '' ?>><?= e($a['name']) ?></option><?php endforeach; ?></select></div>
    <div><label for="f_topic" style="margin-top:0">Hilfethema</label>
      <select id="f_topic" name="filters[helpTopicId]"><option value="">Alle</option><?php foreach ($topics as $t): ?><option value="<?= $t['id'] ?>" <?= ($cfg['filters']['helpTopicId'] ?? '') == $t['id'] ? 'selected' : '' ?>><?= e($t['path']) ?></option><?php endforeach; ?></select></div>
    <div><label for="f_source" style="margin-top:0">Quelle</label>
      <select id="f_source" name="filters[source]"><option value="">Alle</option><?php foreach (['web' => 'Web', 'email' => 'E-Mail', 'phone' => 'Telefon', 'staff' => 'Mitarbeiter', 'chat' => 'Live-Chat', 'api' => 'API'] as $k => $l): ?><option value="<?= $k ?>" <?= ($cfg['filters']['source'] ?? '') === $k ? 'selected' : '' ?>><?= $l ?></option><?php endforeach; ?></select></div>
  </div>
  <label style="margin-top:14px">Kennzahlen</label>
  <div style="display:flex;flex-wrap:wrap;gap:6px 18px">
    <?php foreach ($metrics as $k => $m): ?>
      <label style="display:flex;align-items:center;gap:6px;font-weight:400;margin:0"><input type="checkbox" name="metrics[]" value="<?= e($k) ?>" style="width:auto" <?= in_array($k, $cfg['metrics'], true) ? 'checked' : '' ?>> <?= e($m[0]) ?></label>
    <?php endforeach; ?>
  </div>
  <div style="display:flex;gap:12px;align-items:end;flex-wrap:wrap;margin-top:12px">
    <div><label for="sort" style="margin-top:0">Sortieren nach</label>
      <select id="sort" name="sort"><option value="label" <?= $cfg['sort'] === 'label' ? 'selected' : '' ?>>Gruppe</option><?php foreach ($metrics as $k => $m): ?><option value="<?= e($k) ?>" <?= $cfg['sort'] === $k ? 'selected' : '' ?>><?= e($m[0]) ?></option><?php endforeach; ?></select></div>
    <label style="display:flex;align-items:center;gap:6px;font-weight:400;margin:0 0 8px"><input type="checkbox" name="desc" value="1" style="width:auto" <?= $cfg['desc'] ? 'checked' : '' ?>> absteigend</label>
    <button type="submit" class="btn">Bericht erstellen</button>
  </div>
</form>

<div class="card" style="padding:0;overflow:auto">
  <table>
    <thead><tr><?php foreach ($report['columns'] as $c): ?><th><?= e($c['label']) ?></th><?php endforeach; ?></tr></thead>
    <tbody>
      <?php foreach ($report['rows'] as $row): ?>
        <tr>
          <td><strong><?= e((string) $row['label']) ?></strong></td>
          <?php foreach (array_slice($report['columns'], 1) as $c): $v = $row[$c['key']]; ?>
            <td>
              <?= e($fmtValue($v, $c['unit'])) ?>
              <?php if ($v !== null && $c['unit'] === ''): ?><div style="height:4px;background:var(--panel2,#eef1f5);border-radius:3px;margin-top:3px"><div style="height:100%;width:<?= (int) round(($v / $maxByMetric[$c['key']]) * 100) ?>%;background:var(--primary,#1f8fe0);border-radius:3px"></div></div><?php endif; ?>
            </td>
          <?php endforeach; ?>
        </tr>
      <?php endforeach; ?>
      <?php if (!$report['rows']): ?><tr><td colspan="<?= count($report['columns']) ?>" class="muted">Keine Tickets im gewählten Zeitraum.</td></tr><?php else: ?>
        <tr style="font-weight:700;background:var(--panel2,#f4f6f9)"><td>Gesamt</td>
          <?php foreach (array_slice($report['columns'], 1) as $c): ?><td><?= e($fmtValue($report['totals'][$c['key']] ?? null, $c['unit'])) ?><?= $c['unit'] !== '' ? ' <span class="muted" style="font-weight:400;font-size:.72rem">Ø</span>' : '' ?></td><?php endforeach; ?></tr>
      <?php endif; ?>
    </tbody>
  </table>
</div>

<details class="card" style="margin-top:14px">
  <summary style="cursor:pointer;font-weight:600">Diesen Bericht speichern</summary>
  <form method="post" style="margin-top:10px;max-width:420px">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="save">
    <input type="hidden" name="return_query" value="<?= e($queryOf($cfg)) ?>">
    <label for="report_name" style="margin-top:0">Name</label>
    <input type="text" id="report_name" name="report_name" maxlength="120" placeholder="z. B. Monatsbericht Support" required>
    <label style="display:flex;align-items:center;gap:8px;font-weight:400;margin-top:10px"><input type="checkbox" name="shared" value="1" style="width:auto"> Für alle Mitarbeiter sichtbar</label>
    <div class="btn-row"><button type="submit" class="btn">Speichern</button></div>
  </form>
</details>

<details class="card" style="margin-top:14px" id="versand" <?= $schedules ? 'open' : '' ?>>
  <summary style="cursor:pointer;font-weight:600">Versand per E-Mail (Zeitplan)</summary>
  <p class="muted" style="font-size:.84rem">Ein gespeicherter Bericht wird regelmäßig neu berechnet und als Tabelle an die Empfänger gemailt. Der Zeitraum ist relativ (z. B. „Letzte Kalenderwoche“), die Datumsangaben im gespeicherten Bericht werden dafür ersetzt. Berechnet wird mit Ihren Abteilungsrechten.</p>
  <?php if ($schedules): ?>
  <table style="margin-bottom:14px">
    <thead><tr><th>Bericht</th><th>Rhythmus</th><th>Zeitraum</th><th>Empfänger</th><th>Weniger Mails</th><th>Nächster Versand</th><th>Zuletzt</th><th></th></tr></thead>
    <tbody>
    <?php foreach ($schedules as $sc): ?>
      <tr style="<?= (int) $sc['enabled'] ? '' : 'opacity:.55' ?>">
        <td><strong><?= e($sc['report_name']) ?></strong></td>
        <td><?= e(report_schedule_frequencies()[$sc['frequency']] ?? '') ?><?= $sc['frequency'] === 'weekly' ? ', ' . e(report_schedule_weekdays()[(int) $sc['weekday']] ?? '') : ($sc['frequency'] === 'monthly' ? ', am ' . (int) $sc['monthday'] . '.' : '') ?>, <?= e($sc['send_time']) ?></td>
        <td><?= e(report_schedule_periods()[$sc['period']] ?? '') ?></td>
        <td style="max-width:240px;word-break:break-all"><?= e($sc['recipients']) ?></td>
        <td style="white-space:nowrap">
          <?php foreach (['only_if_data' => 'Nur bei Daten', 'skip_unchanged' => 'Nur bei Änderung', 'weekdays_only' => 'Nur Mo–Fr'] as $flag => $flagLabel):
              if ($flag === 'weekdays_only' && $sc['frequency'] !== 'daily') continue; ?>
            <form method="post" style="display:block;margin:0 0 3px"><?= csrf_field() ?><input type="hidden" name="action" value="schedule_flag"><input type="hidden" name="schedule_id" value="<?= (int) $sc['id'] ?>"><input type="hidden" name="flag" value="<?= e($flag) ?>"><button class="btn secondary" type="submit" style="padding:1px 8px;font-size:.74rem" title="Umschalten"><?= !empty($sc[$flag]) ? '☑' : '☐' ?> <?= e($flagLabel) ?></button></form>
          <?php endforeach; ?>
        </td>
        <td class="muted"><?= (int) $sc['enabled'] ? e(format_dt((string) $sc['next_run_at'])) : 'pausiert' ?></td>
        <td class="muted"><?= $sc['last_error'] ? '<span style="color:var(--danger)">' . e($sc['last_error']) . '</span>' : ($sc['last_sent_at'] ? e(format_dt((string) $sc['last_sent_at'])) : '–') ?><?= !empty($sc['last_note']) ? '<div style="font-size:.74rem">' . e($sc['last_note']) . '</div>' : '' ?></td>
        <td style="white-space:nowrap">
          <?php foreach (['schedule_test' => 'Test senden', 'schedule_toggle' => (int) $sc['enabled'] ? 'Pausieren' : 'Aktivieren', 'schedule_delete' => 'Löschen'] as $act => $lbl): ?>
            <form method="post" style="display:inline" <?= $act === 'schedule_delete' ? 'onsubmit="return confirm(\'Zeitplan löschen?\')"' : '' ?>><?= csrf_field() ?><input type="hidden" name="action" value="<?= $act ?>"><input type="hidden" name="schedule_id" value="<?= (int) $sc['id'] ?>"><button class="btn secondary" type="submit" style="padding:2px 9px;font-size:.76rem"><?= e($lbl) ?></button></form>
          <?php endforeach; ?>
        </td>
      </tr>
    <?php endforeach; ?>
    </tbody>
  </table>
  <?php endif; ?>
  <?php if ($ownReports): ?>
  <form method="post" style="display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px;align-items:end;max-width:900px">
    <?= csrf_field() ?>
    <input type="hidden" name="action" value="schedule_add">
    <div><label for="sc_report" style="margin-top:0">Bericht</label><select id="sc_report" name="report_id"><?php foreach ($ownReports as $r): ?><option value="<?= (int) $r['id'] ?>"><?= e($r['name']) ?></option><?php endforeach; ?></select></div>
    <div><label for="sc_freq" style="margin-top:0">Rhythmus</label><select id="sc_freq" name="frequency"><?php foreach (report_schedule_frequencies() as $k => $l): ?><option value="<?= e($k) ?>" <?= $k === 'weekly' ? 'selected' : '' ?>><?= e($l) ?></option><?php endforeach; ?></select></div>
    <div><label for="sc_wd" style="margin-top:0">Wochentag (wöchentlich)</label><select id="sc_wd" name="weekday"><?php foreach (report_schedule_weekdays() as $k => $l): ?><option value="<?= $k ?>"><?= e($l) ?></option><?php endforeach; ?></select></div>
    <div><label for="sc_md" style="margin-top:0">Tag im Monat (monatlich)</label><select id="sc_md" name="monthday"><?php for ($d = 1; $d <= 28; $d++): ?><option value="<?= $d ?>"><?= $d ?>.</option><?php endfor; ?></select></div>
    <div><label for="sc_time" style="margin-top:0">Uhrzeit</label><input type="time" id="sc_time" name="send_time" value="08:00"></div>
    <div style="grid-column:1 / -1;display:flex;gap:6px 20px;flex-wrap:wrap">
      <input type="hidden" name="quiet_form" value="1">
      <label style="display:flex;align-items:center;gap:6px;font-weight:400;margin:0"><input type="checkbox" name="only_if_data" value="1" style="width:auto" checked> Nur senden, wenn der Bericht Daten enthält</label>
      <label style="display:flex;align-items:center;gap:6px;font-weight:400;margin:0"><input type="checkbox" name="skip_unchanged" value="1" style="width:auto" checked> Nur senden, wenn sich etwas geändert hat</label>
      <label style="display:flex;align-items:center;gap:6px;font-weight:400;margin:0"><input type="checkbox" name="weekdays_only" value="1" style="width:auto" checked> Bei „Täglich“ nur Montag bis Freitag</label>
    </div>
    <div><label for="sc_period" style="margin-top:0">Zeitraum</label><select id="sc_period" name="period"><?php foreach (report_schedule_periods() as $k => $l): ?><option value="<?= e($k) ?>" <?= $k === 'last_week' ? 'selected' : '' ?>><?= e($l) ?></option><?php endforeach; ?></select></div>
    <div style="grid-column:1 / -1"><label for="sc_to" style="margin-top:0">Empfänger (E-Mail-Adressen, getrennt durch Komma oder Zeilenumbruch)</label><textarea id="sc_to" name="recipients" rows="2" required placeholder="leitung@firma.de"></textarea><?php if ($staff['role'] !== 'admin'): ?><div class="muted" style="font-size:.76rem">Nur Adressen aktiver Mitarbeiter; externe Empfänger kann ein Administrator eintragen.</div><?php endif; ?></div>
    <div><button type="submit" class="btn">Zeitplan anlegen</button></div>
  </form>
  <?php else: ?><p class="muted">Speichern Sie zuerst einen Bericht (unten), um einen Versand einzurichten.</p><?php endif; ?>
</details>

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