<?php
/**
 * OnlyOffice Conversion API: DOCX -> PDF.
 * Requires onlyoffice_convert_url (e.g. https://office.clientright.ru:9443/ConvertService.ashx or /converter).
 */

class OnlyOfficeTemplates_ConvertService
{
    protected $convertUrl;
    protected $documentServerBase;

    public function __construct(array $config)
    {
        $this->convertUrl = rtrim($config['onlyoffice_convert_url'] ?? '', '/');
        if (strpos($this->convertUrl, '/converter') !== false) {
            $this->documentServerBase = preg_replace('#/converter.*$#', '', $this->convertUrl);
        } else {
            $this->documentServerBase = preg_replace('#/ConvertService\.ashx.*$#', '', $this->convertUrl);
        }
    }

    /**
     * Convert DOCX at given URL to PDF.
     *
     * @param string $docxUrl Absolute URL to DOCX (must be accessible by Document Server)
     * @param string $title File name for display
     * @return array [ 'success' => bool, 'pdfPath' => temp file path, 'error' => message ]
     */
    public function convertToPdf($docxUrl, $title = 'document.docx')
    {
        if (empty($this->convertUrl)) {
            return ['success' => false, 'error' => 'OnlyOffice conversion URL not configured (OOT_ONLYOFFICE_CONVERT_URL).'];
        }
        $key = md5($docxUrl . time());
        $body = [
            'async' => false,
            'filetype' => 'docx',
            'key' => $key,
            'outputtype' => 'pdf',
            'title' => $title,
            'url' => $docxUrl,
        ];
        $ctx = stream_context_create([
            'http' => [
                'method' => 'POST',
                'header' => "Content-Type: application/json\r\nAccept: application/json\r\n",
                'content' => json_encode($body),
                'timeout' => 120,
            ],
            'ssl' => ['verify_peer' => false, 'verify_peer_name' => false],
        ]);
        $response = @file_get_contents($this->convertUrl, false, $ctx);
        if ($response === false) {
            return ['success' => false, 'error' => 'Conversion request failed (connection or timeout).'];
        }
        $data = json_decode($response, true);
        if (!$data) {
            $data = ['error' => -1, 'endConvert' => false];
        }
        if (!empty($data['error'])) {
            return ['success' => false, 'error' => 'Conversion error code: ' . $data['error']];
        }
        if (empty($data['endConvert']) || empty($data['fileUrl'])) {
            return ['success' => false, 'error' => 'Conversion did not return file URL.'];
        }
        $fileUrl = $data['fileUrl'];
        if (strpos($fileUrl, 'http') !== 0) {
            $fileUrl = rtrim($this->documentServerBase, '/') . '/' . ltrim($fileUrl, '/');
        }
        $tempPdf = sys_get_temp_dir() . '/oot_pdf_' . uniqid() . '.pdf';
        $pdfContent = @file_get_contents($fileUrl, false, stream_context_create(['http' => ['timeout' => 60], 'ssl' => ['verify_peer' => false]]));
        if ($pdfContent === false || strlen($pdfContent) === 0) {
            return ['success' => false, 'error' => 'Failed to download converted PDF from Document Server.'];
        }
        file_put_contents($tempPdf, $pdfContent);
        return ['success' => true, 'pdfPath' => $tempPdf];
    }
}