namespace Oculus.Platform.Samples.VrHoops
{
	using UnityEngine;
	using Oculus.Platform;
	using Oculus.Platform.Models;

	public class PlatformManager : MonoBehaviour
	{
		private static PlatformManager s_instance;
		private MatchmakingManager m_matchmaking;
		private P2PManager m_p2p;
		private LeaderboardManager m_leaderboards;
		private AchievementsManager m_achievements;
		private State m_currentState;

		// my Application-scoped Oculus ID
		private ulong m_myID;

		// my Oculus user name
		private string m_myOculusID;

		void Update()
		{
			m_p2p.UpdateNetwork();
			m_leaderboards.CheckForUpdates();
		}

		#region Initialization and Shutdown

		void Awake()
		{
			// make sure only one instance of this manager ever exists
			if (s_instance != null)
			{
				Destroy(gameObject);
				return;
			}

			s_instance = this;
			DontDestroyOnLoad(gameObject);

			Core.Initialize();
			m_matchmaking = new MatchmakingManager();
			m_p2p = new P2PManager();
			m_leaderboards = new LeaderboardManager();
			m_achievements = new AchievementsManager();
		}


		void Start()
		{
			// First thing we should do is perform an entitlement check to make sure
			// we successfully connected to the Oculus Platform Service.
			Entitlements.IsUserEntitledToApplication().OnComplete(IsEntitledCallback);
		}

		void IsEntitledCallback(Message msg)
		{
			if (msg.IsError)
			{
				TerminateWithError(msg);
				return;
			}

			// Next get the identity of the user that launched the Application.
			Users.GetLoggedInUser().OnComplete(GetLoggedInUserCallback);
		}

		void GetLoggedInUserCallback(Message<User> msg)
		{
			if (msg.IsError)
			{
				TerminateWithError(msg);
				return;
			}

			m_myID = msg.Data.ID;
			m_myOculusID = msg.Data.OculusID;

			TransitionToState(State.WAITING_TO_PRACTICE_OR_MATCHMAKE);
			Achievements.CheckForAchievmentUpdates();
		}

		// In this example, for most errors, we terminate the Application.  A full App would do
		// something more graceful.
		public static void TerminateWithError(Message msg)
		{
			Debug.Log("Error: " + msg.GetError().Message);
			UnityEngine.Application.Quit();
		}

		public void QuitButtonPressed()
		{
			UnityEngine.Application.Quit();
		}

		void OnApplicationQuit()
		{
			// be a good matchmaking citizen and leave any queue immediately
			Matchmaking.LeaveQueue();
		}

		#endregion

		#region Properties

		public static MatchmakingManager Matchmaking
		{
			get { return s_instance.m_matchmaking; }
		}

		public static P2PManager P2P
		{
			get { return s_instance.m_p2p; }
		}

		public static LeaderboardManager Leaderboards
		{
			get { return s_instance.m_leaderboards; }
		}

		public static AchievementsManager Achievements
		{
			get { return s_instance.m_achievements; }
		}

		public static State CurrentState
		{
			get { return s_instance.m_currentState; }
		}

		public static ulong MyID
		{
			get
			{
				if (s_instance != null)
				{
					return s_instance.m_myID;
				}
				else
				{
					return 0;
				}
			}
		}

		public static string MyOculusID
		{
			get
			{
				if (s_instance != null && s_instance.m_myOculusID != null)
				{
					return s_instance.m_myOculusID;
				}
				else
				{
					return string.Empty;
				}
			}
		}

		#endregion

		#region State Management

		public enum State
		{
			// loading platform library, checking application entitlement,
			// getting the local user info
			INITIALIZING,

			// waiting on the user to join a matchmaking queue or play a practice game
			WAITING_TO_PRACTICE_OR_MATCHMAKE,

			// waiting for the match to start or viewing results
			MATCH_TRANSITION,

			// actively playing a practice match
			PLAYING_A_LOCAL_MATCH,

			// actively playing an online match
			PLAYING_A_NETWORKED_MATCH,
		};

		public static void TransitionToState(State newState)
		{
			if (s_instance && s_instance.m_currentState != newState)
			{
				s_instance.m_currentState = newState;
			}
		}

		#endregion
	}
}