<?php
header('Content-Type: application/json');
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

require_once(__DIR__ . '/class/db-functions.php');

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

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

if (!$data || !isset($data['template_id'], $data['xls_headers'])) {
    echo json_encode(["success" => false, "message" => "Invalid or missing data"]);
    exit;
}

$templateId = $data['template_id'];
$xlsHeaders = $data['xls_headers'];
$headerRow = isset($data['header_row']) ? (int)$data['header_row'] : null;
$startColumn = isset($data['start_column']) ? (int)$data['start_column'] : null;

try {
    $sql = "UPDATE excel_templates SET xls_headers = ?";
    $params = [$xlsHeaders];

    if ($headerRow !== null) {
        $sql .= ", header_row = ?";
        $params[] = $headerRow;
    }
    if ($startColumn !== null) {
        $sql .= ", start_column = ?";
        $params[] = $startColumn;
    }

    $sql .= " WHERE id = ?";
    $params[] = $templateId;

    $stmt = $pdo->prepare($sql);
    $result = $stmt->execute($params);

    if (!$result) {
        echo json_encode(["success" => false, "message" => "Database update failed"]);
        exit;
    }

    echo json_encode(["success" => true, "message" => "XLS headers saved successfully"]);
} catch (Exception $e) {
    echo json_encode(["success" => false, "message" => "Error: " . $e->getMessage()]);
}
exit;