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path: root/Xamarin.Forms.Platform.Tizen/TizenPlatformServices.cs
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using System;
using System.IO;
using System.Reflection;
using System.Collections.Generic;
using System.Security.Cryptography;
using System.Threading;
using System.Threading.Tasks;
using System.Net.Http;
using Xamarin.Forms.Internals;
using ElmSharp;

namespace Xamarin.Forms.Platform.Tizen
{
	internal class TizenPlatformServices : IPlatformServices
	{
		static MD5 checksum = MD5.Create();

		static SynchronizationContext s_context;

		public TizenPlatformServices()
		{
			s_context = SynchronizationContext.Current;
		}

		public class TizenTicker : Ticker
		{
			readonly Timer _timer;

			public TizenTicker()
			{
				_timer = new Timer((object o) => HandleElapsed(o), this, Timeout.Infinite, Timeout.Infinite);
			}

			protected override void EnableTimer()
			{
				_timer.Change(16, 16);
			}

			protected override void DisableTimer()
			{
				_timer.Change(-1, -1);
			}

			void HandleElapsed(object state)
			{
				s_context.Post((o) => SendSignals(-1), null);
			}
		}
		#region IPlatformServices implementation

		public double GetNamedSize(NamedSize size, Type targetElementType, bool useOldSizes)
		{
			double baseSize = 10;
			double baseSizeSpan = 2;

			// In case of TV profile The base named size sholud be lager than mobile profile
			if (Device.Idiom == TargetIdiom.TV)
			{
				// TODO: These valuse should be updated when TV profile UX guideline released.
				baseSize = 60;
				baseSizeSpan = 5;
			}

			switch (size)
			{
				case NamedSize.Micro:
					return baseSize;
				case NamedSize.Small:
					return baseSize + baseSizeSpan;
				case NamedSize.Default:
				case NamedSize.Medium:
					return baseSize + (baseSizeSpan * 2);
				case NamedSize.Large:
					return baseSize + (baseSizeSpan * 4);
				default:
					throw new ArgumentOutOfRangeException();
			}
		}

		public void OpenUriAction(Uri uri)
		{
			throw new NotImplementedException();
		}

		public void BeginInvokeOnMainThread(Action action)
		{
			if (EcoreMainloop.IsMainThread)
			{
				action();
			}
			else
			{
				s_context.Post((o) => action(), null);
			}
		}

		public Ticker CreateTicker()
		{
			return new TizenTicker();
		}

		public void StartTimer(TimeSpan interval, Func<bool> callback)
		{
			Timer timer = null;
			bool invoking = false;
			TimerCallback onTimeout = o =>
			{
				if (!invoking)
				{
					invoking = true;
					BeginInvokeOnMainThread(() =>
						{
							if (!callback())
							{
								timer.Dispose();
							}
							invoking = false;
						}
					);
				}
			};
			timer = new Timer(onTimeout, null, Timeout.Infinite, Timeout.Infinite);
			// set interval separarately to prevent calling onTimeout before `timer' is assigned
			timer.Change(interval, interval);
		}

		public async Task<Stream> GetStreamAsync(Uri uri, CancellationToken cancellationToken)
		{
			using (var client = new HttpClient())
			using (HttpResponseMessage response = await client.GetAsync(uri, cancellationToken))
				return await response.Content.ReadAsStreamAsync();
		}

		public Assembly[] GetAssemblies()
		{
			return AppDomain.CurrentDomain.GetAssemblies();
		}

		public IIsolatedStorageFile GetUserStoreForApplication()
		{
			return new TizenIsolatedStorageFile();
		}

		static readonly char[] HexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		public string GetMD5Hash(string input)
		{
			byte[] bin = checksum.ComputeHash(System.Text.Encoding.UTF8.GetBytes(input));
			char[] hex = new char[32];
			for (var i = 0; i < 16; ++i)
			{
				hex[2 * i] = HexDigits[bin[i] >> 4];
				hex[2 * i + 1] = HexDigits[bin[i] & 0xf];
			}
			return new string(hex);
		}

		public bool IsInvokeRequired
		{
			get
			{
				return !EcoreMainloop.IsMainThread;
			}
		}

		public string RuntimePlatform => Device.Tizen;

		#endregion

		// In .NETCore, AppDomain is not supported. The list of the assemblies should be generated manually.
		internal class AppDomain
		{
			public static AppDomain CurrentDomain { get; private set; }

			List<Assembly> _assemblies;

			static AppDomain()
			{
				CurrentDomain = new AppDomain();
			}

			AppDomain()
			{
				_assemblies = new List<Assembly>();

				// Add this renderer assembly to the list
				RegisterAssembly(GetType().GetTypeInfo().Assembly);
			}

			internal void RegisterAssembly(Assembly asm)
			{
				if (!_assemblies.Contains(asm))
				{
					_assemblies.Add(asm);
				}
			}

			public Assembly[] GetAssemblies()
			{
				return _assemblies.ToArray();
			}
		}
	}
}