using System;
using System.Diagnostics;
using System.Threading.Tasks;
using Tizen.Maps;
using Xamarin.Forms.Maps.Tizen;
using Xamarin.Forms.Platform.Tizen;

namespace Xamarin
{
	public static class FormsMaps
	{
		static MapService _mapService = null;

		static string ProviderName { get; set; }

		static string AuthenticationToken { get; set; }

		internal static bool IsInitialized { get; private set; }

		internal static MapService MapService
		{
			get
			{
				Debug.Assert(_mapService != null, "FormsMaps is not initialized");
				return _mapService;
			}
		}

		public static void Init(string provider, string authenticationToken)
		{
			ProviderName = provider;
			AuthenticationToken = authenticationToken;

			if (IsInitialized)
				return;

			FormsApplication.RequestingUserConsentFunc = new Func<Task>(() =>
			{
				TaskCompletionSource<bool> userConsentWaiter = new TaskCompletionSource<bool>();
				UserConsentAction(userConsentWaiter);
				return userConsentWaiter.Task;
			});
		}

		static async void UserConsentAction(TaskCompletionSource<bool> tcs)
		{
			var result = await MapService.RequestUserConsent(ProviderName);
			{
				if (result)
				{
					_mapService = new MapService(ProviderName, AuthenticationToken);
					if (_mapService != null)
					{
						GeocoderBackend.Register();
						IsInitialized = true;
					}
				}
				else
				{
					Debug.WriteLine("Failed to get user consent which is required to use map service");
				}
				tcs.SetResult(result);
			}
		}
	}
}