<?php
/*+***********************************************************************************
 * The contents of this file are subject to the vtiger CRM Public License Version 1.0
 * ("License"); You may not use this file except in compliance with the License
 * The Original Code is:  vtiger CRM Open Source
 * The Initial Developer of the Original Code is vtiger.
 * Portions created by vtiger are Copyright (C) vtiger.
 * All Rights Reserved.
 *************************************************************************************/

/**
 * DownloadS3 Action
 * Скачивание файлов из S3 хранилища через presigned URLs
 * 
 * @author AI Assistant
 * @date 2025-09-20
 */

class Documents_DownloadS3_Action extends Vtiger_Action_Controller {

    public function requiresPermission(\Vtiger_Request $request) {
        return array();
    }

    public function checkPermission(\Vtiger_Request $request) {
        $moduleName = $request->getModule();
        $moduleModel = Vtiger_Module_Model::getInstance($moduleName);

        $userPrivilegesModel = Users_Privileges_Model::getCurrentUserPrivilegesModel();
        $permission = $userPrivilegesModel->hasModulePermission($moduleModel->getId());

        if(!$permission) {
            throw new AppException(vtranslate($moduleName).' '.vtranslate('LBL_NOT_ACCESSIBLE'));
        }

        $recordId = $request->get('record');
        if($recordId) {
            $recordEntityName = getSalesEntityType($recordId);
            if($recordEntityName !== $moduleName) {
                throw new AppException(vtranslate('LBL_PERMISSION_DENIED'));
            }
        }
    }

    public function process(\Vtiger_Request $request) {
        global $log;
        
        $recordId = $request->get('record');
        $moduleName = $request->getModule();
        
        $log->debug("DownloadS3: Processing download for record $recordId");
        
        try {
            // Получаем информацию о документе
            $recordModel = Vtiger_Record_Model::getInstanceById($recordId, $moduleName);
            
            if (!$recordModel) {
                throw new Exception("Document not found: $recordId");
            }
            
            // Проверяем, есть ли S3 метаданные
            $db = PearDatabase::getInstance();
            $result = $db->pquery(
                "SELECT s3_bucket, s3_key, filename FROM vtiger_notes WHERE notesid = ? AND s3_key IS NOT NULL", 
                array($recordId)
            );
            
            if ($db->num_rows($result) > 0) {
                // Файл в S3 - используем presigned URL
                $row = $db->query_result_rowdata($result, 0);
                $s3Bucket = $row['s3_bucket'];
                $s3Key = $row['s3_key'];
                $filename = $row['filename'];
                
                $log->debug("DownloadS3: Found S3 file - bucket: $s3Bucket, key: $s3Key");
                
                // Загружаем S3 Storage Service
                require_once __DIR__ . '/../../../include/Storage/S3StorageService.php';
                $s3Service = new S3StorageService();
                
                // Генерируем presigned URL
                $presignedUrl = $s3Service->presignGet($s3Key, '+10 minutes');
                
                $log->debug("DownloadS3: Generated presigned URL for record $recordId");
                
                // Перенаправляем на presigned URL
                header('Location: ' . $presignedUrl, true, 302);
                exit;
                
            } else {
                // Файл в локальном storage - используем старый метод
                $log->debug("DownloadS3: No S3 metadata found, falling back to local storage for record $recordId");
                
                // Проверяем, есть ли файл в локальном storage
                $fileDetails = $recordModel->getFileDetails();
                if (!empty($fileDetails) && $recordModel->get('filelocationtype') == 'I') {
                    // Используем старый метод скачивания
                    $recordModel->downloadFile();
                } else {
                    throw new Exception("File not found in S3 or local storage for record: $recordId");
                }
            }
            
        } catch (Exception $e) {
            $log->error("DownloadS3: Error downloading file for record $recordId: " . $e->getMessage());
            
            // Показываем пользователю ошибку
            header('Content-Type: text/html; charset=utf-8');
            echo '<html><head><title>Ошибка скачивания</title></head><body>';
            echo '<h1>Ошибка скачивания файла</h1>';
            echo '<p>Не удалось скачать файл. Попробуйте позже.</p>';
            echo '<p><a href="javascript:history.back()">Вернуться назад</a></p>';
            echo '</body></html>';
            exit;
        }
    }
}
?>