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

/**
 * api/staff/v1/availability.php
 *
 * Mobile-Pendant zu staff/availability.php (nur der Status-Teil, kein Schichtplan-
 * Editor – der bleibt eine Web-Admin-Aufgabe). Gleiche staff_availability-Tabelle
 * und dieselbe "keine Zeile = Offline"-Konvention wie im Web (siehe dort und
 * live_chat_locked_by_other()/chat_any_staff_available() in includes/functions.php
 * bzw. live_chat.php für die Stellen, die sich darauf verlassen).
 */

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

const AVAILABILITY_STATUSES = ['available', 'busy', 'break', 'offline'];

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $agents = $pdo->query(
        'SELECT s.id, s.name, s.is_on_vacation, sa.status, sa.note, sa.updated_at
         FROM staff s
         LEFT JOIN staff_availability sa ON sa.staff_id = s.id
         WHERE s.is_active = 1
         ORDER BY s.name'
    )->fetchAll();

    $me = null;
    $team = [];
    foreach ($agents as $a) {
        $entry = [
            'id'           => (int) $a['id'],
            'name'         => $a['name'],
            'status'       => $a['is_on_vacation'] ? 'offline' : ($a['status'] ?: 'offline'),
            'note'         => $a['is_on_vacation'] ? 'Urlaub' : ($a['note'] ?? ''),
            'isOnVacation' => (bool) $a['is_on_vacation'],
            'updatedAt'    => $a['updated_at'],
        ];
        $team[] = $entry;
        if ((int) $a['id'] === (int) $staff['id']) {
            // "Mein Status" fällt (wie im Web) auf "available" zurück, solange nie gesetzt –
            // reine Anzeige-Vorauswahl, ändert nichts an der "Offline"-Team-Konvention oben.
            $me = ['status' => $a['status'] ?: 'available', 'note' => $a['note'] ?? ''];
        }
    }

    api_json(['myStatus' => $me['status'] ?? 'available', 'myNote' => $me['note'] ?? '', 'team' => $team]);
}

$body = api_request_body();
$newStatus = (string) ($body['status'] ?? '');
$note = trim((string) ($body['note'] ?? ''));

if (!in_array($newStatus, AVAILABILITY_STATUSES, true)) {
    api_error(422, 'INVALID_STATUS', 'Ungültiger Status.');
}

$drv = $pdo->getAttribute(PDO::ATTR_DRIVER_NAME);
$sql = $drv === 'sqlite'
    ? 'INSERT INTO staff_availability (staff_id, status, note, updated_at) VALUES (?,?,?,?)
       ON CONFLICT(staff_id) DO UPDATE SET status=excluded.status, note=excluded.note, updated_at=excluded.updated_at'
    : 'INSERT INTO staff_availability (staff_id, status, note, updated_at) VALUES (?,?,?,?)
       ON DUPLICATE KEY UPDATE status=VALUES(status), note=VALUES(note), updated_at=VALUES(updated_at)';
$pdo->prepare($sql)->execute([$staff['id'], $newStatus, $note ?: null, db_now()]);

api_json(['ok' => true, 'status' => $newStatus]);