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SessionPickerViewModel.cs
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SessionPickerViewModel.cs
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// ---------------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// The MIT License (MIT)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// ---------------------------------------------------------------------------------
using AnnotatedAudio.Model;
using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Runtime.Serialization.Json;
using System.Threading.Tasks;
namespace AnnotatedAudio.ViewModel
{
public class SessionPickerViewModel : BindableBase
{
public OneDriveManager OneDriveManager { get; set; }
public Func<Task<Windows.UI.Xaml.Controls.ContentDialogResult>> ConfirmDeletion { get; set; }
public Func<string, Task<string>> StringInput { get; set; }
public EventHandler<object> SessionStarted { get; set; }
public ObservableCollection<Session> Sessions { get; set; } = new ObservableCollection<Session>();
public Session SelectedSession
{
get => (Session)SelectedItem;
set => SelectedItem = value;
}
public object SelectedItem
{
get => _selectedItem;
set
{
if (SetProperty(ref _selectedItem, value))
{
OnPropertyChanged(nameof(SelectedSession));
var ignoreResult = StartSession.Execute();
}
}
}
private object _selectedItem;
public string Status
{
get => _status;
set => SetProperty(ref _status, value);
}
private string _status;
public string StatusDetails
{
get => _statusDetails;
set => SetProperty(ref _statusDetails, value);
}
private string _statusDetails;
public DelegateCommand CreateSession
{
get
{
return _createSession ?? (_createSession = new DelegateCommand(
async () =>
{
var input = await this.StringInput("Please name your new session.");
if (input != null && input != "")
{
Session session = new Session() { Id = Guid.NewGuid(), Name = input, Created = DateTime.Now, Segments = 0 };
Sessions.Add(session);
SelectedSession = session;
await SaveSessionList();
}
}));
}
}
private DelegateCommand _createSession;
public DelegateCommand<Guid> DeleteSession
{
get
{
return _deleteSession ?? (_deleteSession = new DelegateCommand<Guid>(
async (id) =>
{
var result = await ConfirmDeletion();
// If the user selected the primary button: "Delete"
if (result == Windows.UI.Xaml.Controls.ContentDialogResult.Primary)
{
var target = Sessions.Where(s => s.Id == id).FirstOrDefault();
int targetIndex = Sessions.IndexOf(target);
Sessions.Remove(target);
// Clean up
try
{
var storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
var folder = await storageFolder.GetFolderAsync($"{id}");
await folder.DeleteAsync();
var file = await storageFolder.GetFileAsync($"{id}.zip");
await file.DeleteAsync();
}
catch (Exception)
{
// Do nothing because there is nothing to clean up.
}
await SaveSessionList();
await OneDriveManager.DeleteFile($"{id}.zip");
}
}));
}
}
private DelegateCommand<Guid> _deleteSession;
public DelegateCommand StartSession
{
get
{
return _startSession ?? (_startSession = new DelegateCommand(
async () =>
{
Status = "Loading your session...";
StatusDetails = "Please wait while we load your session...";
var selectedSession = ((Session)SelectedSession);
var response = await OneDriveManager.DownloadFile($"{selectedSession?.Id}.zip");
// If the Session wasn't found on OneDrive, it's a new session, so create a folder.
if (!response)
{
var cd = Windows.Storage.ApplicationData.Current.LocalFolder;
try
{
cd = await cd.CreateFolderAsync(SelectedSession.Id.ToString());
}
catch (Exception)
{
// Folder already exists, do nothing.
}
}
try
{
await SelectedSession.DecompressSession(true);
SessionStarted?.Invoke(this, SelectedSession);
}
catch (IOException)
{
SessionStarted?.Invoke(this, SelectedSession);
}
catch (Exception ex)
{
Status = "Uh-oh :(";
StatusDetails = "It looks like there was an error, please tap Start to try again. " +
"If you keep getting this message try sharing the following with your tech-savvy friend.\n"
+ ex.Message;
}
}));
}
}
private DelegateCommand _startSession;
public async Task Setup(OneDriveManager manager)
{
OneDriveManager = manager;
Status = "Downloading your sessions";
StatusDetails = "Please wait while your data rains from your cloud...";
// Download AnnotatedAudio/SessionIds.json from OneDrive and store it
// in Windows.Storage.ApplicationData.Current.LocalFolder. If it doesn't exist, do nothing.
var response = await OneDriveManager.DownloadFile("SessionList.json");
if (!response)
{
Status = "Looks like you are new";
StatusDetails = "We couldn't find any sessions you created using your Microsoft account. " +
"You can create a new session for recording by tapping Create. " +
"After it appears in the list below, you can start recording and taking notes " +
"by selecting it and tapping Start";
return;
}
try
{
Windows.Storage.StorageFolder storageFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
Windows.Storage.StorageFile metaFile =
await storageFolder.GetFileAsync($"SessionList.json");
var buffer = (await Windows.Storage.FileIO.ReadBufferAsync(metaFile)).ToArray();
using (var stream = new MemoryStream(buffer))
{
Session[] ids = new Session[0];
ids = (Session[])new DataContractJsonSerializer(ids.GetType()).ReadObject(stream);
ids.ToList().ForEach(s =>Sessions.Add(new Session()
{ Id = s.Id, Name = s.Name, Created = s.Created, Segments = s.Segments }));
if (ids.Count() <= 0)
{
Status = "You don't have anything yet";
StatusDetails = "We couldn't find any sessions you created using your Microsoft account. " +
"You can create a new session to start recording and taking notes.";
return;
}
Status = "Your recorded sessions";
StatusDetails = "You can create a new session for recording, " +
"view and modify an existing session, or delete one.";
}
}
catch (FileNotFoundException)
{
Status = "Uh-oh :(";
StatusDetails = "It looks like there was an error, please tap the back button and try again.";
}
}
public async Task SaveSessionList()
{
byte[] arr;
using (var datastream = new MemoryStream())
{
var settings = new DataContractJsonSerializerSettings();
settings.UseSimpleDictionaryFormat = true;
new DataContractJsonSerializer(typeof(ObservableCollection<Session>), settings).WriteObject(datastream, Sessions);
arr = datastream.ToArray();
}
// Save async -- save as timestamp.gif
// Prevent updates to the file until updates are
// finalized with call to CompleteUpdatesAsync.
var fileName = $"SessionList.json";
// Create sample file; replace if exists.
var storageFolder =
Windows.Storage.ApplicationData.Current.LocalFolder;
var file =
await storageFolder.CreateFileAsync(fileName,
Windows.Storage.CreationCollisionOption.ReplaceExisting);
Windows.Storage.CachedFileManager.DeferUpdates(file);
await Windows.Storage.FileIO.WriteBytesAsync(file, arr);
// Finalize write so other apps can update file.
var status =
await Windows.Storage.CachedFileManager.CompleteUpdatesAsync(file);
if (status == Windows.Storage.Provider.FileUpdateStatus.Complete)
{
arr.LogMessage("sessions", "Successfully saved session metadata");
await OneDriveManager.UploadFile(file, (p) => System.Diagnostics.Debug.WriteLine(p));
}
else
{
arr.LogMessage("sessions", "Unsuccessfully saved session metadata");
}
}
}
}