<?php
declare(strict_types=1);
require_once __DIR__ . '/common.php';

api_require_method('GET');
$staff = api_require_staff();
$pdo = get_db();

$departmentIds = staff_department_ids($staff);
[$deptFilter, $deptParams] = dept_filter_sql($departmentIds, 'department_id');

$stmt = $pdo->prepare(
    "SELECT COUNT(*) FROM tickets
     WHERE assigned_staff_id = ? AND status NOT IN ('resolved','closed'){$deptFilter}"
);
$stmt->execute([$staff['id'], ...$deptParams]);
$myOpen = (int) $stmt->fetchColumn();

$stmt = $pdo->prepare(
    "SELECT COUNT(*) FROM tickets
     WHERE status NOT IN ('resolved','closed') AND (is_overdue = 1 OR (sla_paused_at IS NULL AND resolution_due_at IS NOT NULL AND resolution_due_at < ?))
       AND status NOT IN ('resolved','closed'){$deptFilter}"
);
$stmt->execute([db_now(), ...$deptParams]);
$overdue = (int) $stmt->fetchColumn();

$stmt = $pdo->prepare(
    "SELECT COUNT(*) FROM tickets
     WHERE assigned_staff_id IS NULL AND status NOT IN ('resolved','closed'){$deptFilter}"
);
$stmt->execute($deptParams);
$unassigned = (int) $stmt->fetchColumn();

$stmt = $pdo->prepare("SELECT COUNT(*) FROM tickets WHERE status = 'open'{$deptFilter}");
$stmt->execute($deptParams);
$unanswered = (int) $stmt->fetchColumn();

$todayStart = date('Y-m-d 00:00:00');
$stmt = $pdo->prepare("SELECT COUNT(*) FROM tickets WHERE resolved_at >= ?{$deptFilter}");
$stmt->execute([$todayStart, ...$deptParams]);
$resolvedToday = (int) $stmt->fetchColumn();

$periodStart = date('Y-m-d 00:00:00', strtotime('-30 days'));
$stmt = $pdo->prepare(
    "SELECT
        COUNT(*) AS total,
        SUM(CASE WHEN resolution_due_at IS NULL OR resolved_at <= resolution_due_at THEN 1 ELSE 0 END) AS on_time
     FROM tickets
     WHERE resolved_at >= ?{$deptFilter}"
);
$stmt->execute([$periodStart, ...$deptParams]);
$slaRow = $stmt->fetch();
$slaTotal = (int) ($slaRow['total'] ?? 0);
$slaPercent = $slaTotal > 0 ? round(((int) $slaRow['on_time'] / $slaTotal) * 100, 1) : null;

// "Priorisiert": dieselbe Auswahl wie in staff/dashboard.php ("mir zugewiesen oder
// unbearbeitet"), damit die App-Übersicht dieselben Tickets zeigt wie die Web-Oberfläche.
[$deptFilterAliased, $deptParamsAliased] = dept_filter_sql($departmentIds, 't.department_id');
$stmt = $pdo->prepare(
    "SELECT t.*, p.name AS priority_name, p.color AS priority_color, d.name AS department_name, s.name AS staff_name
     FROM tickets t
     JOIN priorities p ON p.id = t.priority_id
     JOIN departments d ON d.id = t.department_id
     LEFT JOIN staff s ON s.id = t.assigned_staff_id
     WHERE t.status NOT IN ('resolved','closed') AND (t.assigned_staff_id = ? OR t.assigned_staff_id IS NULL){$deptFilterAliased}
     ORDER BY t.resolution_due_at ASC
     LIMIT 12"
);
$stmt->execute([$staff['id'], ...$deptParamsAliased]);
$recent = array_map('api_ticket_summary', $stmt->fetchAll());

$response = [
    'myOpen' => $myOpen,
    'overdue' => $overdue,
    'unassigned' => $unassigned,
    'unanswered' => $unanswered,
    'resolvedToday' => $resolvedToday,
    'slaPercent' => $slaPercent,
    'recent' => $recent,
    'departments' => null,
];

// Voller Überblick über alle Abteilungen nur für uneingeschränkten Zugriff (Admin).
if ($departmentIds === null) {
    $stmt = $pdo->prepare(
        "SELECT d.id, d.name,
            COUNT(CASE WHEN t.status NOT IN ('resolved','closed') THEN 1 END) AS open_count,
            COUNT(CASE WHEN t.status NOT IN ('resolved','closed')
                        AND (t.is_overdue = 1 OR (t.sla_paused_at IS NULL AND t.resolution_due_at IS NOT NULL AND t.resolution_due_at < ?))
                       THEN 1 END) AS overdue_count
         FROM departments d
         LEFT JOIN tickets t ON t.department_id = d.id
         GROUP BY d.id, d.name
         ORDER BY d.name"
    );
    $stmt->execute([db_now()]);
    $rows = $stmt->fetchAll();
    $response['departments'] = array_map(fn(array $row) => [
        'name' => $row['name'],
        'open' => (int) $row['open_count'],
        'overdue' => (int) $row['overdue_count'],
    ], $rows);
}

api_json($response);