<?php
// update_pdf_page_meta.php
// Salva i metadati delle pagine del PDF (numero pagine e dimensioni renderizzate)
// nella colonna pdf_page_meta del template.
//
// Riceve JSON: { template_id, pdf_page_meta }
// dove pdf_page_meta è una stringa JSON tipo:
// {"pages":3,"dims":[{"page":1,"width":1000,"height":1414}, ...]}

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

include('include/headscript.php');

function respond(bool $success, string $message = ''): void
{
    echo json_encode(['success' => $success, 'message' => $message]);
    exit;
}

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

if (!is_array($data)) {
    respond(false, 'Invalid JSON payload.');
}

$templateId = isset($data['template_id']) ? (int)$data['template_id'] : 0;
$pageMeta   = $data['pdf_page_meta'] ?? null;

if ($templateId <= 0) {
    respond(false, 'Missing or invalid template_id.');
}

// pdf_page_meta deve essere una stringa JSON valida
if (!is_string($pageMeta)) {
    respond(false, 'pdf_page_meta must be a JSON string.');
}

$decoded = json_decode($pageMeta, true);
if ($decoded === null && json_last_error() !== JSON_ERROR_NONE) {
    respond(false, 'pdf_page_meta is not valid JSON: ' . json_last_error_msg());
}

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

    $stmt = $pdo->prepare("UPDATE excel_templates SET pdf_page_meta = :meta WHERE id = :id");
    $stmt->execute([
        ':meta' => $pageMeta,
        ':id'   => $templateId,
    ]);
} catch (Throwable $e) {
    respond(false, 'Database update failed: ' . $e->getMessage());
}

respond(true, 'Page metadata saved.');