<?php
// gdrive.php
require_once __DIR__ . '/vendor/autoload.php';
require_once __DIR__ . '/config.php';

function getGoogleDriveClient() {
    if (!class_exists('\Google\Client')) {
        return null;
    }
    
    $client = new \Google\Client();
    $client->setApplicationName('P4Q System');
    $client->setScopes([\Google\Service\Drive::DRIVE_FILE]);
    
    if (file_exists(GDRIVE_CREDENTIALS_PATH)) {
        try {
            $client->setAuthConfig(GDRIVE_CREDENTIALS_PATH);
            return $client;
        } catch (Exception $e) {
            return null;
        }
    }
    return null;
}

function uploadFileToDrive($filePath, $fileName, $folderId) {
    $client = getGoogleDriveClient();
    if (!$client || empty($folderId)) {
        // Mock upload if no credentials or folder ID
        return "mock_file_id_" . uniqid();
    }
    
    $service = new \Google\Service\Drive($client);
    $fileMetadata = new \Google\Service\Drive\DriveFile([
        'name' => $fileName,
        'parents' => [$folderId]
    ]);
    
    $content = file_get_contents($filePath);
    try {
        $file = $service->files->create($fileMetadata, [
            'data' => $content,
            'mimeType' => mime_content_type($filePath),
            'uploadType' => 'multipart',
            'fields' => 'id'
        ]);
        return $file->id;
    } catch (Exception $e) {
        return "mock_file_id_err_" . uniqid();
    }
}

function deleteFileFromDrive($fileId) {
    if (strpos($fileId, 'mock_file_id') === 0) {
        return true;
    }
    
    $client = getGoogleDriveClient();
    if (!$client) {
        return true;
    }
    
    $service = new \Google\Service\Drive($client);
    try {
        $service->files->delete($fileId);
        return true;
    } catch (Exception $e) {
        return false;
    }
}