Circuits/Assets/Resources/Scripts/Main/Networking/Lobby/LobbyManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Photon.Pun;
using Photon.Realtime;
using UnityEngine.UI;

public class LobbyManager : MonoBehaviourPunCallbacks {

	//Lobby Manager Singleton
	public static LobbyManager Instance {
		get; set;
	}

	//Buttons
	public GameObject connectButton;
	public GameObject connectingButton;
	public GameObject createRoomButton;

	//Panels
	public GameObject creatingRoomPanel;

	//Menues
	public GameObject nameInputMenu;
	public GameObject roomSetupMenu;
	public GameObject roomMenu;

	//Inputs
	public InputField playerNameInput;
	public InputField roomNameInput;

	//Scripts
	public GUIController gui;
	public RoomLayoutGroup roomLayoutGroup;

	private RoomState state;

	//Current List of available rooms in the default lobby
	private readonly List<RoomInfo> roomList = new List<RoomInfo>();

	private void Awake() {
		Instance = this;
		state = RoomState.NAME;
	}

	public void OnConnectButtonClicked() {
		Debug.Log("Connect Button clicked");

		PhotonNetwork.ConnectUsingSettings();
		PhotonNetwork.SendRate = MultiplayerSettings.Instance.sendRate;
		PhotonNetwork.SerializationRate = MultiplayerSettings.Instance.serializationRate;

		connectButton.SetActive(false);
		connectingButton.SetActive(true);
	}

	public void OnCreateRoomButtonClicked() {
		Debug.Log("Create Room Button clicked");

		string roomName = roomNameInput.text;
		TryCreateRoom(roomName);
	}

	public void OnJoinRoomButtonClicked(string roomName) {
		Debug.Log("Trying to join room: " + roomName);

		PhotonNetwork.JoinRoom(roomName);
	}

	public void OnBackButtonClicked() {
		Debug.Log("Back Button clicked");

		switch (state) {
			case RoomState.ROOM:
				PhotonNetwork.LeaveRoom();
				break;
			case RoomState.ROOM_SETUP:
				PhotonNetwork.Disconnect();
				break;
			case RoomState.NAME:
				gameObject.SetActive(false);
				gui.OpenMenu();
				break;
		}
	}

	public override void OnConnectedToMaster() {
		PhotonNetwork.AutomaticallySyncScene = true;
		PhotonNetwork.LocalPlayer.NickName = playerNameInput.text;
		PhotonNetwork.JoinLobby(TypedLobby.Default);

		nameInputMenu.SetActive(false);
		roomSetupMenu.SetActive(true);

		roomNameInput.text = PhotonNetwork.NickName + "'s Room";

		state = RoomState.ROOM_SETUP;
	}

	public override void OnDisconnected(DisconnectCause cause) {
		connectingButton.SetActive(false);
		connectButton.SetActive(true);

		roomSetupMenu.SetActive(false);
		nameInputMenu.SetActive(true);

		state = RoomState.NAME;
	}

	public override void OnJoinedLobby() {
		Debug.Log("Joined default lobby");
	}

	public override void OnJoinedRoom() {
		Debug.Log("You successfully joined a room");

		roomSetupMenu.SetActive(false);
		roomMenu.SetActive(true);
		RoomManager.Instance.OnJoinedRoom();

		state = RoomState.ROOM;
	}

	public override void OnLeftRoom() {
		Debug.Log("You successfully left a room");

		RoomManager.Instance.OnLeftRoom();
		roomMenu.SetActive(false);
		roomSetupMenu.SetActive(true);

		state = RoomState.ROOM_SETUP;
	}

	public override void OnPlayerLeftRoom(Player otherPlayer) {
		Debug.Log("Player " + otherPlayer.NickName + " (" + otherPlayer.ActorNumber + ") left the room");
	}

	public override void OnCreatedRoom() {
		Debug.Log("You successfully created a room");

		creatingRoomPanel.SetActive(false);
	}

	public override void OnCreateRoomFailed(short returnCode, string message) {
		Debug.Log("You failed to create a room");

		creatingRoomPanel.SetActive(false);
	}

	public override void OnRoomListUpdate(List<RoomInfo> roomList) {
		Debug.Log("Room List Update");

		ChacheRoomList(roomList);
		roomLayoutGroup.OnReceivedRoomListUpdate(this.roomList);
	}

	private void TryCreateRoom(string name) {
		Debug.Log("Trying to create a room");

		creatingRoomPanel.SetActive(true);
		RoomOptions roomOps = new RoomOptions() {
			IsVisible = true,
			IsOpen = true,
			MaxPlayers = (byte)MultiplayerSettings.Instance.maxPlayers,
			CleanupCacheOnLeave = false
		};
		PhotonNetwork.CreateRoom(name, roomOps, TypedLobby.Default);
	}

	/**
	 * The updated List form Photon only contains changed rooms, so we
	 * must cache our actual list of available rooms
	 */
	private void ChacheRoomList(List<RoomInfo> updatedList) {

		//First, see for changed and/or added roomInfo
		//This information can also contain empty, closed and hidden rooms (removed later)
		foreach (RoomInfo roomInfo in updatedList) {

			//Remove outdated roomLists which are updated in the updatedList
			roomList.RemoveAll(room => room.Name == roomInfo.Name);

			//Add the updated roomInfo to my roomList
			roomList.Add(roomInfo);
		}

		//Second, remove not needed (empty, closed, hidden) roomInfos
		roomList.RemoveAll(room => !room.IsOpen || !room.IsVisible || room.PlayerCount == 0);
	}
}

public enum RoomState {
	NAME,
	ROOM_SETUP,
	ROOM
}