<?php
header('Content-Type: application/json');

require_once(__DIR__ . '/include/headscript.php');

try {
    $db = DBHandlerSelect::getInstance();
    $pdo = $db->getConnection();

    $input = json_decode(file_get_contents('php://input'), true);

    $id    = (int)($input['id'] ?? 0);
    $field = (string)($input['field'] ?? '');
    $value = $input['value'] ?? null;

    if ($id <= 0) {
        echo json_encode(['success' => false, 'message' => 'Invalid id']);
        exit;
    }

    $allowed = [
        'default_value',
        'default_source',
        'json_node',
        'is_visible_import',
        'is_required'
    ];

    if (!in_array($field, $allowed, true)) {
        echo json_encode(['success' => false, 'message' => 'Invalid field: ' . $field]);
        exit;
    }

    if ($field === 'is_visible_import' || $field === 'is_required') {
        $value = ((int)$value === 1) ? 1 : 0;
    }

    if ($field === 'default_source') {
        $value = (string)$value;

        if (!in_array($value, ['manual', 'json'], true)) {
            echo json_encode(['success' => false, 'message' => 'Invalid default_source']);
            exit;
        }

        // If the user goes back to manual, clear the JSON node
        if ($value === 'manual') {
            $sql = "
                UPDATE template_fixed_mapping 
                SET default_source = :val, json_node = NULL 
                WHERE id = :id
            ";
            $stmt = $pdo->prepare($sql);
            $ok = $stmt->execute([
                ':val' => $value,
                ':id'  => $id
            ]);

            echo json_encode(['success' => (bool)$ok]);
            exit;
        }
    }

    if ($field === 'json_node') {
        $value = trim((string)$value);

        if ($value === '') {
            $value = null;
        }
    }

    $sql = "UPDATE template_fixed_mapping SET {$field} = :val WHERE id = :id";
    $stmt = $pdo->prepare($sql);

    $ok = $stmt->execute([
        ':val' => $value,
        ':id'  => $id
    ]);

    echo json_encode(['success' => (bool)$ok]);
} catch (Throwable $e) {
    echo json_encode([
        'success' => false,
        'message' => $e->getMessage()
    ]);
}