<?php
include('include/headscript.php');

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

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

    if (!$input) {
        throw new Exception('Invalid JSON payload');
    }

    $templateId = isset($input['template_id']) ? (int)$input['template_id'] : 0;
    $apiSampleJson = $input['api_sample_json'] ?? '';
    $jsonNodes = $input['json_nodes'] ?? '';

    if ($templateId <= 0) {
        throw new Exception('Invalid template ID');
    }

    if (trim($apiSampleJson) === '') {
        throw new Exception('API sample JSON is empty');
    }

    json_decode($apiSampleJson, true);

    if (json_last_error() !== JSON_ERROR_NONE) {
        throw new Exception('Invalid API sample JSON: ' . json_last_error_msg());
    }

    $decodedNodes = json_decode($jsonNodes, true);

    if (!is_array($decodedNodes)) {
        throw new Exception('Invalid JSON nodes array');
    }

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

    $stmt = $pdo->prepare("
        UPDATE excel_templates
        SET 
            api_sample_json = ?,
            json_nodes = ?
        WHERE id = ?
    ");

    $stmt->execute([
        $apiSampleJson,
        json_encode($decodedNodes, JSON_UNESCAPED_UNICODE),
        $templateId
    ]);

    echo json_encode([
        'success' => true,
        'nodes_count' => count($decodedNodes)
    ]);
} catch (Throwable $e) {
    echo json_encode([
        'success' => false,
        'message' => $e->getMessage()
    ]);
}