<?php
/**
 * UpdateTerm.php - Aktualisiert einen bestehenden Normdaten-Eintrag
 * 
 * Parameter (POST) - von JavaScript:
 * - AnchorID: ID des Eintrags
 * - authType: Typ (Subject, Person, etc.)
 * - term: Neuer Anzeigetext
 * - detailtype: Neuer Untertyp (optional)
 * - classification: Neuer Klassifikationscode (optional)
 * - scopenote: Neuer Kommentar (optional)
 */

header('Content-Type: application/json; charset=utf-8');

include "db_connection.php";

$conn = mysqli_connect(HOST, USER, PASSWORD, DATABASE);
if (mysqli_connect_errno()) {
    echo json_encode(['success' => false, 'error' => 'Datenbankverbindung fehlgeschlagen']);
    exit();
}

mysqli_set_charset($conn, "utf8");

// Parameter aus JavaScript
$id = isset($_POST['AnchorID']) ? intval($_POST['AnchorID']) : 0;
if ($id === 0) {
    $id = isset($_POST['ID']) ? intval($_POST['ID']) : 0;
}
$text = isset($_POST['term']) ? trim($_POST['term']) : '';
$detailType = isset($_POST['detailtype']) ? trim($_POST['detailtype']) : '';
$classification = isset($_POST['classification']) ? trim($_POST['classification']) : '';
$comment = isset($_POST['scopenote']) ? trim($_POST['scopenote']) : '';

if ($id === 0) {
    echo json_encode(['success' => false, 'error' => 'ID muss angegeben werden']);
    exit();
}

if (empty($text)) {
    echo json_encode(['success' => false, 'error' => 'Text darf nicht leer sein']);
    exit();
}

mysqli_begin_transaction($conn);

try {
    // 1. Anchor aktualisieren (Text, DetailType, Classification)
    $updateAnchorSql = "UPDATE Anchor SET 
                        Text = '" . mysqli_real_escape_string($conn, $text) . "',
                        DetailType = '" . mysqli_real_escape_string($conn, $detailType) . "',
                        Classification = '" . mysqli_real_escape_string($conn, $classification) . "'
                        WHERE ID = $id";
    
    if (!mysqli_query($conn, $updateAnchorSql)) {
        throw new Exception('Fehler beim Aktualisieren des Anchor: ' . mysqli_error($conn));
    }
    
    // 2. Entry aktualisieren
    $updateEntrySql = "UPDATE Entry SET 
                       Text = '" . mysqli_real_escape_string($conn, $text) . "',
                       CompleteText = '" . mysqli_real_escape_string($conn, $text) . "',
                       Comment = '" . mysqli_real_escape_string($conn, $comment) . "'
                       WHERE ID = $id";
    
    if (!mysqli_query($conn, $updateEntrySql)) {
        throw new Exception('Fehler beim Aktualisieren des Entry: ' . mysqli_error($conn));
    }
    
    mysqli_commit($conn);
    
    echo json_encode([
        'success' => true,
        'message' => 'Eintrag erfolgreich aktualisiert'
    ]);
    
} catch (Exception $e) {
    mysqli_rollback($conn);
    echo json_encode(['success' => false, 'error' => $e->getMessage()]);
}

mysqli_close($conn);
?>