<?php

use Google\Client as GoogleClient;
use Google\Service\Drive;

if (!function_exists('uploadFilesToGoogleDrive')) {
    function uploadFilesToGoogleDrive(array $files, $doc_name, $pt_id)
    {   
        $appName = getenv('GOOGLE_OAUTH_APP_NAME');
        $clientID = getenv('GOOGLE_OAUTH_CLIENT_ID');
        $clientSecret = getenv('GOOGLE_OAUTH_CLIENT_SECRET');
        $redirectUri = getenv('GOOGLE_OAUTH_REDIRECT_URI');
        $scopes = explode(',', getenv('GOOGLE_OAUTH_SCOPES')); 
        $accessToken = session()->get('access_token'); 
        log_message('error', '//////////////  ---   G-Drive Access Token {data}', ['data' =>  $accessToken]);

        // Initialize Google Client
        $client = new GoogleClient();
        $client->setApplicationName($appName);
        $client->setClientId($clientID);
        $client->setClientSecret($clientSecret);
        $client->setRedirectUri($redirectUri);
        $client->addScope($scopes); 
        // $client->setApprovalPrompt('force'); 
        $client->setPrompt('consent');
        $client->setAccessType('offline'); 
        

        if ($accessToken) {

            $client->setAccessToken($accessToken); 
            log_message('error', '//////////////  ---   G-Drive Access Token expired :  {data}', ['data' => $client->isAccessTokenExpired()]);
            
            if ($client->isAccessTokenExpired()) {
                
                $refreshToken = session()->get('refresh_token'); 
                log_message('error', '//////////////  ---   G-Drive Refresh Token :  {data}', ['data' =>  $refreshToken]);
            
                if ($refreshToken) {
                    $client->fetchAccessTokenWithRefreshToken($refreshToken);
                    $token = $client->getAccessToken();
            
                    if (isset($token['access_token'])) {
                        session()->set('access_token', $token['access_token']);
                        // $client->setAccessToken($token);
                        log_message('error', '//////////////  ---   G-Drive Access Token refreshed and stored successfully.');
                    } else {
                        log_message('error', '//////////////  ---   G-Drive Access Token not available after refresh.');
                    }
            
                    if (isset($token['refresh_token'])) {
                        session()->set('refresh_token', $token['refresh_token']);
                        log_message('error', '//////////////  ---   G-Drive Refresh Token updated successfully.');
                    } else {
                        log_message('error', '//////////////  ---   G-Drive Refresh Token not available after refresh.');
                    }
            
                } else {
                    log_message('error', '//////////////  ---   G-Drive Refresh Token Not Available');
                    redirect()->to(filter_var($client->createAuthUrl(), FILTER_SANITIZE_URL));
                }
            } else {
                log_message('error', '//////////////  ---   G-Drive Access Token is still valid.');
            }
            

            try {
                
                    $driveService = new Drive($client);
                    $folderName = 'New Folder';
                    
                    // Check if the folder already exists
                    $response = $driveService->files->listFiles([
                        'q' => "mimeType='application/vnd.google-apps.folder' and name='{$folderName}' and trashed=false",
                        'fields' => 'files(id, name)'
                    ]);
                    
                    $filesList = $response->getFiles();
                    $folderId = null;
                    
                    if (count($filesList) > 0) {
                        // Folder already exists
                        $folderId = $filesList[0]->getId();
                    } else {
                        // Create a new folder
                        $folder = new Drive\DriveFile();
                        $folder->setName($folderName);
                        $folder->setMimeType('application/vnd.google-apps.folder');
                    
                        $createdFolder = $driveService->files->create($folder, [
                            'fields' => 'id'
                        ]);
                    
                        $folderId = $createdFolder->id;
                    }
                    
                    $uploadedFiles = [];
                    
                    foreach ($files as $key => $file) {
                    
                        if (!empty($file)) {
                    
                            $dname = $doc_name[$key];
                    
                            $driveFile = new Drive\DriveFile();
                            $driveFile->setName($file->getClientName());
                            $driveFile->setParents([$folderId]);
                    
                            $result = $driveService->files->create(
                                $driveFile,
                                [
                                    'data' => file_get_contents($file->getTempName()),
                                    'mimeType' => $file->getClientMimeType(),
                                    'uploadType' => 'multipart'
                                ]
                            );
                    
                            $uploadedFiles[] = [
                                'file_name' => $file->getClientName(),
                                'drive_id' => $result->id,
                                'doc_name' => $dname,
                                'pt_id' => $pt_id,
                                'created_by' => get_session_userid(),
                                'url' => "https://drive.google.com/file/d/{$result->id}/view",
                            ];
                        }
                    }
                    
                    return $uploadedFiles;
                    
            } catch (\Exception $e) {

                $errorDetails = [
                    'status' => 'error',
                    'error_message' => 'Error uploading files: ' . $e->getMessage(),
                    'error_code' => $e->getCode(),
                    'file' => $e->getFile(),
                    'line' => $e->getLine(),
                    'stack_trace' => $e->getTraceAsString()
                ];

                return $errorDetails;
            }
        } else {

            $url = $client->createAuthUrl();
            return redirect()->to(filter_var($url, FILTER_SANITIZE_URL));
        }
    }
}