using System;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Auth.OAuth2.Flows;
using Google.Apis.Auth.OAuth2.Responses;
using Google.Apis.Drive.v3;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using Google.Apis.Drive.v3.Data;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Services;

namespace AsbCloudInfrastructure.Services
{
    public class GoogleDriveService : IGoogleDriveService, IDisposable
    {
        private readonly DriveService service;
        
        public GoogleDriveService()
        {   // ключи для почты asbautodrilling@gmail.com.
            var tokenResponse = new TokenResponse
            {
                AccessToken = "ya29.a0ARrdaM-lM7q0TIC_DXixR4oW63QUftjSPHl-8nIdvZwtqA8Z1bXtlYpDrQXj9UFTjW8FW8uqPMrdamUSp4kO4a9JX7FddkBWxaJ_omSJpqzDfnHTHA_7-zGMUohaAsmPLsQtFz_GUmB5ZoVLmA8xWdbJxVxU",
                RefreshToken = "1//04FeDguc19IfgCgYIARAAGAQSNwF-L9Ir8U7wX2seanUzsxXXGgFzOYQqjbtN9O27ZZybbOobZjVAo_4_eFNLMX1ElPKOFVWsrJQ"
            };

            var applicationName = "Files";
            var username = "asbautodrilling@gmail.com";

            var apiCodeFlow = new GoogleAuthorizationCodeFlow(new GoogleAuthorizationCodeFlow.Initializer
            {
                ClientSecrets = new ClientSecrets
                {
                    ClientId = "1020584579240-f7amqg35qg7j94ta1ntgitajq27cgh49.apps.googleusercontent.com",
                    ClientSecret = "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"
                },
                Scopes = new[] {DriveService.Scope.Drive},
                DataStore = new FileDataStore(applicationName)
            });

            var credential = new UserCredential(apiCodeFlow, username, tokenResponse);

            var newService = new DriveService(new BaseClientService.Initializer
            {
                HttpClientInitializer = credential,
                ApplicationName = applicationName
            });
            service = newService;
        }
        
        public IEnumerable<Google.Apis.Drive.v3.Data.File> GetAllFiles()
        {
            var fileList = service.Files.List();
            fileList.Fields = "files(id, webViewLink, size)";
            //fileList.Q =$"mimeType!='application/vnd.google-apps.folder' and '{folder}' in parents";
            //fileList.Fields = "nextPageToken, files(id, name, size, mimeType)";
        
            var result = new List<Google.Apis.Drive.v3.Data.File>();
            string pageToken = null;
            do
            {
                fileList.PageToken = pageToken;
                var filesResult = fileList.Execute();
                var files = filesResult.Files;
                pageToken = filesResult.NextPageToken;
                result.AddRange(files);
            } while (pageToken != null);
        
            return result;
        }

        public async Task<string> GetFileWebLinkAsync(string idFile,
            CancellationToken token = default)
        {
            var fileList = service.Files.List();
            fileList.Fields = "files(id, webViewLink, size)";
            var filesResult = await fileList.ExecuteAsync(token)
                .ConfigureAwait(false);
            var file = filesResult.Files.FirstOrDefault(f => f.Id == idFile);
            return file?.WebViewLink ?? string.Empty;
        }
        
        public async Task<string> CreateFolderAsync(string folderName,
            CancellationToken token = default) 
        {                                       
            var driveFolder = new Google.Apis.Drive.v3.Data.File();
            driveFolder.Name = folderName;
            driveFolder.MimeType = "application/vnd.google-apps.folder";
            //driveFolder.Parents = new string[] { parent };
            var command = service.Files.Create(driveFolder);
            var file = await command.ExecuteAsync(token)
                .ConfigureAwait(false);
            return file.Id;
        }

        public async Task CreatePublicPermissionForFileAsync(string idFile,
            CancellationToken token = default)
        {
            var permission = new Permission() { Type = "anyone", Role = "reader"};
            var addPermissionRequest = service.Permissions.Create(permission, idFile);
            await addPermissionRequest.ExecuteAsync(token)
                .ConfigureAwait(false);
        }
        
        public async Task<string> UploadFileAsync(Stream file, string fileName, string fileMime, 
            string fileDescription, CancellationToken token = default)
        {
            var driveFile = new Google.Apis.Drive.v3.Data.File();
            driveFile.Name = fileName;
            driveFile.Description = fileDescription;
            driveFile.MimeType = fileMime;
            //driveFile.Parents = new [] {folder};
    
            var request = service.Files.Create(driveFile, file, fileMime);
            request.Fields = "id";
    
            var response = await request.UploadAsync(token)
                .ConfigureAwait(false);
            if (response.Status != Google.Apis.Upload.UploadStatus.Completed)
                throw response.Exception;
    
            return request.ResponseBody.Id;
        }

        public async Task DeleteFileAsync(string fileId,
            CancellationToken token = default)
        {
            var command = service.Files.Delete(fileId);
            var result = await command.ExecuteAsync(token)
                .ConfigureAwait(false);
        }

        public void Dispose()
        {
            service.Dispose();
        }
    }
}