using System.Collections;
using System.Collections.Generic;
using Firebase;
using Firebase.Database;
using Firebase.Extensions;
using TMPro;
using UnityEngine;
using System;

public class RoomManager : MonoBehaviour
{
    private RoomState currentState;
    private Room currentRoom = null;
    private List<Player> players;

    public float propositionTime = 60;
    public float votingTime = 20;

    private float propositionCurrentTime = 0;
    private float votingCurrentTime = 0;

    /// <summary>
    /// Contain the infos about the current displayed question (during votes)
    /// </summary>
    private Question currentQuestion;

    private List<Question> questions;

    /// <summary>
    /// When this is equal to questions.Count, go to score page
    /// </summary>
    private int numberOfQuestionVoted = 0;

    DatabaseReference realtimeDB;

    /// <summary>
    /// TextMeshPro that show the value of the current rooom code
    /// </summary>
    public TextMeshProUGUI roomCodeLabel;

    private void Awake()
    {
        FirebaseInitializer.Instance.onFirebaseReady += Initialize;
    }


    private void Start()
    {
        propositionCurrentTime = propositionTime;
        votingCurrentTime = votingTime;
    }

    private void OnApplicationQuit()
    {
        realtimeDB.Child("rooms").Child(currentRoom.code).RemoveValueAsync();
        Debug.Log($"delete room {currentRoom.code}");
        currentRoom = null;
    }

    private void Initialize()
    {
        FirebaseInitializer.Instance.onFirebaseReady -= Initialize;
        realtimeDB = FirebaseDatabase.DefaultInstance.RootReference;
        Debug.Log("Realtime DB initialized");
        CreateNewRoom();
    }

    /// <summary>
    /// Check all the rooms in the server and give back the number already taken
    /// </summary>
    private void WhichCodesAreAlreadyUsed(Action<List<int>> callback_OnCodesChecked)
    {
        List<int> alreadyUsedCodes = new List<int>();
        realtimeDB.Child("rooms").GetValueAsync().ContinueWithOnMainThread(task =>
        {
            if (task.IsFaulted)
            {
                Debug.LogException(task.Exception);
            }
            else if (task.IsCompleted)
            {
                DataSnapshot snapshot = task.Result;
                List<Room> onlineRooms = JsonUtility.FromJson<List<Room>>(snapshot.GetRawJsonValue());
                foreach (Room r in onlineRooms)
                {
                    alreadyUsedCodes.Add(int.Parse(r.code));
                }
            }
            callback_OnCodesChecked?.Invoke(alreadyUsedCodes);
        });

    }

    /// <summary>
    /// Automatically called at start of game
    /// </summary>
    [ContextMenu("Create New Room")]
    public void CreateNewRoom()
    {
        WhichCodesAreAlreadyUsed(codes =>
        {
            Room newRoom = new Room(GenerateRandomAvailableCode(codes).ToString("D4"));
            currentRoom = newRoom;
            string JSON = JsonUtility.ToJson(newRoom);
            realtimeDB.Child("rooms").Child(newRoom.code).SetRawJsonValueAsync(JSON).ContinueWithOnMainThread(task =>
            {
                Debug.Log($"room {currentRoom.code} has been created on the server");
                realtimeDB.Child("rooms").Child(newRoom.code).Child("players").ChildAdded += PlayerConnect;
                //TODO MARINE : uncomment and reference the correct game object
                //roomCodeLabel.text = currentRoom.code;
            });
        });
    }

    /// <summary>
    /// Generate a code between 0 and 1000 that is not in the list
    /// </summary>
    /// <param name="_impossibleCodes">the list of code you don"t want to get</param>
    /// <returns></returns>
    private int GenerateRandomAvailableCode(List<int> _impossibleCodes)
    {
        int random = UnityEngine.Random.Range(0, 1000);
        while (_impossibleCodes.Contains(random))
        {
            Debug.Log($"{random} is already taken, choosing another room code", this);
            random = UnityEngine.Random.Range(0, 1000);
        }
        return random;
    }

    private void DisplayRoomCode()
    {

    }

    public void PlayerSendProposition(Proposition _proposition)
    {

    }

    /// <summary>
    /// Called when the first player clicked "Start"
    /// </summary>
    public void HostStartGame()
    {

    }

    /// <summary>
    /// Start the proposition timer
    /// </summary>
    public void StartPropositionTimer()
    {

    }


    /// <summary>
    /// Automatically called when the proposition timer has finished
    /// </summary>
    public void PropositionTimerFinished()
    {

    }

    /// <summary>
    /// Start the voting timer
    /// </summary>
    public void StartVotingTimer()
    {

    }


    /// <summary>
    /// Automatically called when the voting timer has finished
    /// </summary>
    public void VotingTimerFinished()
    {

    }

    /// <summary>
    /// Automatically called when a proposition is updated (someone has voted or a picture has been proposed)
    /// </summary>
    public void OnPropositionUpdate()
    {

    }

    /// <summary>
    /// Will generate a question with a prompt and two owners
    /// </summary>
    public void GenerateQuestion()
    {

    }

    /// <summary>
    /// Generate all the player pairs
    /// (players should not play against themself.
    /// (players should not play twice with the same person)
    /// </summary>
    public void GenerateCouples()
    {

    }

    /// <summary>
    /// is automatically called when a player connect to the room
    /// </summary>
    /// <param name="_player"></param>
    public void PlayerConnect(object sender, ChildChangedEventArgs args)
    {
        if (args.DatabaseError != null)
        {
            Debug.LogError(args.DatabaseError.Message);
            return;
        }

        string JSON = args.Snapshot.GetRawJsonValue();
        Player joinedPlayer = JsonUtility.FromJson<Player>(JSON);
        Debug.Log($"{joinedPlayer.name} has joined the room");
        //TODO Marine : do somtethjing with the newly joinde player
    }

    [ContextMenu("Fake Player Connection")]
    private void FakePlayerConnection()
    {
        Player temp = new Player("Momo");
        temp.id = System.Guid.NewGuid().ToString();
        temp.SetName("Momo");
    }

}

public enum RoomState
{
    WaitingForPlayer,
    WaitingForPropositions,
    ShowPropositions,
    ShowVoters,
    Score
}