<?php
/**
 * modules/devices/save.php
 *
 * Speichert / aktualisiert ein Gerät
 * - Basisdaten
 * - Rack-Zuordnung
 */

// Nur POST
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    header('Location: ?module=devices&action=list');
    exit;
}

// =========================
// Daten einlesen
// =========================
$deviceId = (int)($_POST['id'] ?? 0);
$name = trim($_POST['name'] ?? '');
$deviceTypeId = (int)($_POST['device_type_id'] ?? 0);
$rackId = (int)($_POST['rack_id'] ?? 0);
$rackPositionHe = (int)($_POST['rack_position_he'] ?? 0);
$rackHeightHe = (int)($_POST['rack_height_he'] ?? 1);
$serialNumber = trim($_POST['serial_number'] ?? '');
$comment = trim($_POST['comment'] ?? '');

// =========================
// Validierung
// =========================
$errors = [];

if (empty($name)) {
    $errors[] = "Name ist erforderlich";
}

if ($deviceTypeId <= 0) {
    $errors[] = "Gerätetyp ist erforderlich";
}

if ($rackId <= 0) {
    $errors[] = "Rack ist erforderlich";
}

if ($rackPositionHe <= 0) {
    $errors[] = "Rack-Position muss >= 1 sein";
}

if ($rackHeightHe < 1) {
    $errors[] = "Höhe muss >= 1 sein";
}

// Falls Fehler: zurück zum Edit-Formular
if (!empty($errors)) {
    $_SESSION['error'] = implode(', ', $errors);
    $redirectUrl = $deviceId ? "?module=devices&action=edit&id=$deviceId" : "?module=devices&action=edit";
    header("Location: $redirectUrl");
    exit;
}

// =========================
// In DB speichern
// =========================
if ($deviceId > 0) {
    // UPDATE
    $sql->set(
        "UPDATE devices SET name = ?, device_type_id = ?, rack_id = ?, rack_position_he = ?, rack_height_he = ?, serial_number = ?, comment = ? WHERE id = ?",
        "siiiissi",
        [$name, $deviceTypeId, $rackId, $rackPositionHe, $rackHeightHe, $serialNumber, $comment, $deviceId]
    );
} else {
    // INSERT
    $sql->set(
        "INSERT INTO devices (name, device_type_id, rack_id, rack_position_he, rack_height_he, serial_number, comment) VALUES (?, ?, ?, ?, ?, ?, ?)",
        "siiiiss",
        [$name, $deviceTypeId, $rackId, $rackPositionHe, $rackHeightHe, $serialNumber, $comment]
    );
    $deviceId = $sql->h->insert_id;
}

$_SESSION['success'] = "Gerät gespeichert";

// =========================
// Redirect
// =========================
header('Location: ?module=devices&action=list');
exit;