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using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Reflection;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Core;
using Windows.Security.Cryptography;
using Windows.Security.Cryptography.Core;
using Windows.Storage;
using Windows.Storage.Search;
using Windows.Storage.Streams;
using Windows.System;
using Windows.UI.Core;
using Windows.UI.Xaml;
#if WINDOWS_UWP
namespace Xamarin.Forms.Platform.UWP
#else
namespace Xamarin.Forms.Platform.WinRT
#endif
{
internal abstract class WindowsBasePlatformServices : IPlatformServices
{
CoreDispatcher _dispatcher;
public WindowsBasePlatformServices(CoreDispatcher dispatcher)
{
if (dispatcher == null)
throw new ArgumentNullException("dispatcher");
_dispatcher = dispatcher;
}
public void BeginInvokeOnMainThread(Action action)
{
_dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => action()).WatchForError();
}
public ITimer CreateTimer(Action<object> callback)
{
return new WindowsTimer(new Timer(o => callback(o), null, Timeout.Infinite, Timeout.Infinite));
}
public ITimer CreateTimer(Action<object> callback, object state, int dueTime, int period)
{
return new WindowsTimer(new Timer(o => callback(o), state, dueTime, period));
}
public ITimer CreateTimer(Action<object> callback, object state, long dueTime, long period)
{
return CreateTimer(callback, state, TimeSpan.FromMilliseconds(dueTime), TimeSpan.FromMilliseconds(period));
}
public ITimer CreateTimer(Action<object> callback, object state, TimeSpan dueTime, TimeSpan period)
{
return new WindowsTimer(new Timer(o => callback(o), state, dueTime, period));
}
public ITimer CreateTimer(Action<object> callback, object state, uint dueTime, uint period)
{
return CreateTimer(callback, state, TimeSpan.FromMilliseconds(dueTime), TimeSpan.FromMilliseconds(period));
}
public virtual Assembly[] GetAssemblies()
{
var options = new QueryOptions { FileTypeFilter = { ".exe", ".dll" } };
StorageFileQueryResult query = Package.Current.InstalledLocation.CreateFileQueryWithOptions(options);
IReadOnlyList<StorageFile> files = query.GetFilesAsync().AsTask().Result;
var assemblies = new List<Assembly>(files.Count);
for (var i = 0; i < files.Count; i++)
{
StorageFile file = files[i];
try
{
Assembly assembly = Assembly.Load(new AssemblyName { Name = Path.GetFileNameWithoutExtension(file.Name) });
assemblies.Add(assembly);
}
catch (IOException)
{
}
catch (BadImageFormatException)
{
}
}
Assembly thisAssembly = GetType().GetTypeInfo().Assembly;
// this happens with .NET Native
if (!assemblies.Contains(thisAssembly))
assemblies.Add(thisAssembly);
return assemblies.ToArray();
}
public string GetMD5Hash(string input)
{
HashAlgorithmProvider algorithm = HashAlgorithmProvider.OpenAlgorithm(HashAlgorithmNames.Md5);
IBuffer buffer = algorithm.HashData(Encoding.Unicode.GetBytes(input).AsBuffer());
return CryptographicBuffer.EncodeToHexString(buffer);
}
public double GetNamedSize(NamedSize size, Type targetElementType, bool useOldSizes)
{
return size.GetFontSize();
}
public async Task<Stream> GetStreamAsync(Uri uri, CancellationToken cancellationToken)
{
using (var client = new HttpClient())
{
HttpResponseMessage streamResponse = await client.GetAsync(uri.AbsoluteUri).ConfigureAwait(false);
return streamResponse.IsSuccessStatusCode ? await streamResponse.Content.ReadAsStreamAsync().ConfigureAwait(false) : null;
}
}
public IIsolatedStorageFile GetUserStoreForApplication()
{
return new WindowsIsolatedStorage(ApplicationData.Current.LocalFolder);
}
public bool IsInvokeRequired => !CoreApplication.MainView.CoreWindow.Dispatcher.HasThreadAccess;
public void OpenUriAction(Uri uri)
{
Launcher.LaunchUriAsync(uri).WatchForError();
}
public void StartTimer(TimeSpan interval, Func<bool> callback)
{
var timer = new DispatcherTimer { Interval = interval };
timer.Start();
timer.Tick += (sender, args) =>
{
bool result = callback();
if (!result)
timer.Stop();
};
}
internal class WindowsTimer : ITimer
{
readonly Timer _timer;
public WindowsTimer(Timer timer)
{
_timer = timer;
}
public void Change(int dueTime, int period)
{
_timer.Change(dueTime, period);
}
public void Change(long dueTime, long period)
{
Change(TimeSpan.FromMilliseconds(dueTime), TimeSpan.FromMilliseconds(period));
}
public void Change(TimeSpan dueTime, TimeSpan period)
{
_timer.Change(dueTime, period);
}
public void Change(uint dueTime, uint period)
{
Change(TimeSpan.FromMilliseconds(dueTime), TimeSpan.FromMilliseconds(period));
}
}
}
}
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