using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using FishNet;
using FishNet.Connection;
using FishNet.Managing.Scened;
using FishNet.Object;
using FishNet.Transporting;
using log4net;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.SceneManagement;

public class SSOLobby : NetworkBehaviour
{
	private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

	#region Fields
	[SerializeField] private NetworkObject clientPrefab;
	public List<Room> createdRooms = new();
	public Dictionary<NetworkConnection, Room> connectionRooms = new();
	#endregion

	#region Init & Update
	protected virtual void Awake()
	{
		Locator.RegisterService<SSOLobby>(this);

		// Register connection state events
		InstanceFinder.ServerManager.OnServerConnectionState += OnServerStateChanged;
		InstanceFinder.ServerManager.OnRemoteConnectionState += OnClienStateChanged;
		InstanceFinder.ClientManager.OnClientConnectionState += OnLocalClientStateChanged;

	}


	public override void OnStartClient()
	{
		if (clientPrefab == null)
		{
			Log.Error("There is no client prefab for the client to spawn.");
			return;
		}

		// // The client gets a client instance upon entering the lobby
		// NetworkObject nob = Instantiate(clientPrefab);
		// Scene scene = UnityEngine.SceneManagement.SceneManager.GetSceneByName("OnlineLobby");
		// UnityEngine.SceneManagement.SceneManager.MoveGameObjectToScene(nob.gameObject, scene);
		// InstanceFinder.ServerManager.Spawn(nob.gameObject, LocalConnection);
		Locator.GetService<LobbyManager>().InitClient(this);
	}

	public override void OnStartServer()
	{
		// TODO: check if the mirror timing issues still persist
		ChangeSubscription(false);
		ChangeSubscription(true);
	}

	public override void OnStopServer()
	{
		base.OnStopServer();
		ChangeSubscription(false);
	}

	public void ChangeSubscription(bool subscribe)
	{
		if (base.NetworkManager == null)
			return;

		if (subscribe)
		{
			base.NetworkManager.SceneManager.OnLoadEnd += OnClientLoadedScene;
			base.NetworkManager.SceneManager.OnClientPresenceChangeEnd += OnClientSceneState;
		}
		else
		{
			base.NetworkManager.SceneManager.OnLoadEnd -= OnClientLoadedScene;
			base.NetworkManager.SceneManager.OnClientPresenceChangeEnd -= OnClientSceneState;
		}
	}

	#endregion

	#region Actions
	public event Action<Room, SceneLoadEndEventArgs> OnServerLoadedScenes;

	public event Action<Room, NetworkObject> OnClientCreatedRoom;
	public event Action<Room, NetworkObject> OnClientLeftRoom;
	public event Action<Room, NetworkObject> OnClientJoinedRoom;
	public event Action<Room, NetworkObject> OnClientStarted;

	// Events for the client
	public event Action<Room> OnRoomCreated;
	public event Action<Room> OnRoomDeleted;
	public event Action<Room> OnRoomStarted;

	public event Action<NetworkObject> OnMemberLeft;
	public event Action<NetworkObject> OnMemberStarted;
	public event Action<NetworkObject> OnMemberJoined;
	public event Action<NetworkObject> OnClientLoggedIn;

	#endregion

	#region Events
	private void OnClientSceneState(ClientPresenceChangeEventArgs args)
	{
	}

	private void OnClientLoadedScene(SceneLoadEndEventArgs args)
	{
	}

	private void OnLocalClientStateChanged(ClientConnectionStateArgs args)
	{
	}

	private void OnClienStateChanged(NetworkConnection connection, RemoteConnectionStateArgs args)
	{
	}

	private void OnServerStateChanged(ServerConnectionStateArgs args)
	{
	}
	#endregion

	#region SignIn
	[Client]
	public void SignIn()
	{
		ServerSignIn();
	}

	[ServerRpc(RequireOwnership = false)]
	private void ServerSignIn(NetworkConnection sender = null)
	{
		// Assign a username to this new connection
		bool success =
			OnSignIn(sender.ClientId, out string username, out string failedReason);

		// Get client instance from that user
		ClientInstance.ReturnClientInstance(sender).Username = username;


		if (success)
		{
			TargetSignInSuccess(sender, username);
		}
		else
		{
			TargetSignInFailed(sender, failedReason);
		}
	}

	// TODO: Username input options and sanitization
	private bool OnSignIn(int clientId, out string username, out string failedReason)
	{
		username = "Ship " + clientId;
		failedReason = "cannot fail yet";
		return true;
	}

	[TargetRpc]
	private void TargetSignInSuccess(NetworkConnection conn, string username)
	{
		OnClientLoggedIn?.Invoke(ClientInstance.ReturnClientInstance(conn).NetworkObject);
		Locator.GetService<LobbyManager>().SignInSuccess(username);
	}

	[TargetRpc]
	private void TargetSignInFailed(NetworkConnection conn, string failedReason)
	{
		Locator.GetService<LobbyManager>().SignInFailed(failedReason);
	}
	#endregion

	#region Create Room
	[Client]
	public void CreateRoom(string roomName = "")
	{
		ServerCreateRoom(roomName);
	}
	[ServerRpc(RequireOwnership = false)]
	private void ServerCreateRoom(string roomName, NetworkConnection sender = null)
	{
		string failedReason = "";
		ClientInstance ci = ClientInstance.ReturnClientInstance(sender);
		if (ci == null)
		{
			failedReason = "Unable to find Client Instance for incoming rpc call.";
			Log.Error(failedReason);
			TargetCreateRoomFailed(sender, failedReason);
			return;
		}
		if (roomName == "")
		{
			roomName = ci.Username + "'s Room";
		}

		Room match = ReturnRoom(ci.NetworkObject);
		if (match != null)
		{
			failedReason = "User is already in a room.";
			Log.Error(failedReason);
			TargetCreateRoomFailed(sender, failedReason);
			return;
		}

		match = ReturnRoom(roomName);
		if (match != null)
		{
			failedReason = "Room was already created.";
			TargetCreateRoomFailed(sender, failedReason);
			return;
		}
		// TODO: Manage room player count
		Room room = new Room(roomName, "", true, 2);
		room.AddMember(ci.NetworkObject);
		createdRooms.Add(room);
		connectionRooms[sender] = room;
		Log.Info($"New room: {roomName} created successfully.");
		OnClientCreatedRoom?.Invoke(room, ci.NetworkObject);
		/*
		RpcUpdateRooms(new Room[] {room});
		*/
		ObserverRoomChange(room, "Create");
		TargetCreateRoomSuccess(sender, room);
	}
	[TargetRpc]
	private void TargetCreateRoomSuccess(NetworkConnection conn, Room room)
	{
		// Local first object instead
		OnMemberJoined?.Invoke(ClientManager.Connection.FirstObject);
		Locator.GetService<LobbyManager>().OnCreateRoom(room);
	}
	[TargetRpc]
	private void TargetCreateRoomFailed(NetworkConnection conn, string failedReason)
	{
		Log.Error(failedReason);
	}
	#endregion

	#region Join Room
	[Client]
	public void JoinRoom(string roomName)
	{
		ServerJoinRoom(roomName);
	}
	[ServerRpc(RequireOwnership = false)]
	private void ServerJoinRoom(string roomName, NetworkConnection sender = null)
	{
		string failedReason = "";
		var ci = ClientInstance.ReturnClientInstance(sender);
		if (ci == null)
		{
			failedReason = "Unable to find Client Instance for incoming rpc call.";
			Log.Error(failedReason);
			TargetJoindRoomFailed(sender, failedReason);
			return;
		}

		Room room = ReturnRoom(roomName);
		if (room == null)
		{
			failedReason = $"No room named: {roomName} was found.";
			Log.Error(failedReason);
			TargetJoindRoomFailed(sender, failedReason);
			return;
		}
		if (ReturnRoom(ci.NetworkObject) != null)
		{
			failedReason = "User is already in a room.";
			Log.Error(failedReason);
			TargetJoindRoomFailed(sender, failedReason);
			return;
		}
		if (room.MemberIds.Count >= room.maxPlayers)
		{
			failedReason = "The room is already full.";
			Log.Error(failedReason);
			TargetJoindRoomFailed(sender, failedReason);
			return;
		}
		if (room.isStarted && room.lockOnStart)
		{
			failedReason = "Room has already started a game.";
			Log.Error(failedReason);
			TargetJoindRoomFailed(sender, failedReason);
			return;
		}
		room.AddMember(ci.NetworkObject);
		connectionRooms[ci.Owner] = room;
		OnClientJoinedRoom?.Invoke(room, ci.NetworkObject);

		foreach (NetworkObject item in room.MemberIds)
		{
			TargetMemberJoined(item.Owner, ci.NetworkObject);
			if (item.Owner != ci.Owner)
			{
				TargetMemberJoined(ci.Owner, item);
			}
		}

		TargetJoinRoomSuccess(sender, room);
	}
	[TargetRpc]
	private void TargetJoinRoomSuccess(NetworkConnection conn, Room room)
	{
		OnMemberJoined?.Invoke(ClientManager.Connection.FirstObject);
		Locator.GetService<LobbyManager>().OnJoinRoom(room);
	}
	[TargetRpc]
	private void TargetJoindRoomFailed(NetworkConnection conn, string failedReason)
	{
		Log.Error(failedReason);
	}
	#endregion

	#region Leave Rooom
	[Client]
	public void LeaveRoom()
	{
		ServerLeaveRoom();
	}
	[ServerRpc(RequireOwnership = false)]
	private void ServerLeaveRoom(NetworkConnection sender = null)
	{
		var ci = ClientInstance.ReturnClientInstance(sender);
		Room room = RemoveFromRoom(ci.NetworkObject, false);
		if (room == null)
		{
			TargetLeaveRoomFailed(sender);
			return;
		}
		TargetLeaveRoomSuccess(sender);
	}
	[TargetRpc]
	private void TargetLeaveRoomSuccess(NetworkConnection conn)
	{
		Locator.GetService<LobbyManager>().OnLeaveRoom();
	}
	[TargetRpc]
	private void TargetLeaveRoomFailed(NetworkConnection conn)
	{
		Log.Error("Leave room failed.");
	}
	#endregion

	#region Manage Rooms
	[Server]
	private Room RemoveFromRoom(NetworkObject clientId, bool clientDisconnected)
	{
		Room room = ReturnRoom(clientId);
		if (room == null)
			return null;
		//Let members know someone left
		foreach (NetworkObject item in room.MemberIds)
		{
			if (clientDisconnected && item == clientId)
				continue;
			TargetMemberLeft(item.Owner, clientId);
		}

		//Remove the member from the room
		room.RemoveMember(clientId);
		connectionRooms.Remove(clientId.Owner);
		OnClientLeftRoom?.Invoke(room, clientId);

		//If not disconnectiong tell client to unload scenes
		if (!clientDisconnected)
		{
			SceneLookupData[] lookups = SceneLookupData.CreateData(room.Scenes.ToArray());
			SceneUnloadData sud = new SceneUnloadData(lookups);
			if (lookups.Length > 0)
				InstanceFinder.SceneManager.UnloadConnectionScenes(clientId.Owner, sud);
		}
		//If room is empty remove room
		if (room.MemberIds.Count == 0)
		{
			createdRooms.Remove(room);
			ObserverRoomChange(room, "Delete");
		}
		return room;
	}

	public Room ReturnRoom(string roomName)
	{
		return createdRooms.FirstOrDefault
			(r => r.name.Equals(roomName, StringComparison.CurrentCultureIgnoreCase));
	}
	public Room ReturnRoom(NetworkObject clientId)
	{
		foreach (Room r in createdRooms)
		{
			if (r.MemberIds.Contains(clientId))
			{
				return r;
			}
		}
		return null;
	}

	[TargetRpc]
	private void TargetMemberJoined(NetworkConnection conn, NetworkObject member)
	{
		OnMemberJoined?.Invoke(member);
		Log.Debug("Member joined");
	}
	[TargetRpc]
	private void TargetMemberLeft(NetworkConnection conn, NetworkObject member)
	{
		OnMemberLeft?.Invoke(member);
		Log.Debug("Member left");
	}

	[ObserversRpc]
	public void ObserverRoomChange(Room room, string action)
	{
		if (action == "Create")
		{
			OnRoomCreated?.Invoke(room);
		}
		else if (action == "Delete")
		{
			OnRoomDeleted?.Invoke(room);
		}
		else if (action == "Started")
		{
			OnRoomStarted?.Invoke(room);
		}
	}
	#endregion
}