using System.Collections;
using System.Collections.Generic;
using TMPro;
using Unity.Netcode;
using UnityEngine;

public struct PlayerScore : INetworkSerializable, System.IEquatable<PlayerScore>
{

    public ulong ClientId;
    public int Score;

    public bool Equals(PlayerScore _other)
    {
        return ClientId == _other.ClientId && Score == _other.Score;
    }

    public void NetworkSerialize<T>(BufferSerializer<T> serializer) where T : IReaderWriter
    {
        serializer.SerializeValue(ref ClientId);
        serializer.SerializeValue(ref Score);
    }
}

public class RoundManager : NetworkBehaviour
{
    public static RoundManager Current { get; private set; }

    [SerializeField] private float roundStartDelay = 3f;
    [SerializeField] private Transform[] spawnPoints;

    private NetworkVariable<float> roundDuration = new NetworkVariable<float>(180f);
    private NetworkVariable<float> roundTimeRemaining = new NetworkVariable<float>(0f);

    private NetworkVariable<int> currentRound = new NetworkVariable<int>(0);
    private NetworkVariable<bool> isRoundActive = new NetworkVariable<bool>(false);

    private List<PlayerHealth> alivePlayers = new List<PlayerHealth>();

    private NetworkList<PlayerScore> playerScores;



    private bool isTimerRunning = false;

    public override void OnNetworkSpawn()
    {
        currentRound.OnValueChanged += OnRoundChanged;
        isRoundActive.OnValueChanged += OnRoundStateChanged;

        // roundTimeRemaining.OnValueChanged += OnTimerChanged;

        if (IsServer) 
        {
            // StartTimerServerRPC();
            StartCoroutine(StartRoundWithDelay());
        }
    }

    private void Update()
    {
        if (!IsServer) return;
        if(!IsRoundActive) return;

        roundTimeRemaining.Value = Mathf.Max(0f, roundTimeRemaining.Value - Time.deltaTime);

        if(roundTimeRemaining.Value <= 0f)
        {
            StartCoroutine(EndRound(0ul));
        }
        
    }


    // public void OnTimerChanged(float _previousValue, float _newValue)


    void Awake()
    {   
        Current = this;

        playerScores = new NetworkList<PlayerScore>();
        roundTimeRemaining.Value = roundDuration.Value;
    }


    public void OnPlayerFellIntoPit(ulong _winnerClientId)
    {
        if (!IsServer) return;

        if(!isRoundActive.Value) return;

        for (int _i = 0; _i < playerScores.Count; _i++)
        {
            playerScores[_i] = new PlayerScore
            {
                ClientId = _winnerClientId,
                Score = playerScores[_i].Score + 1
            };
            break;
        }

        StartCoroutine(EndRound(_winnerClientId));
    }

    public void OnPlayerDied(PlayerHealth _playerHealth)
    {
        // if (!IsServer) return;

        // alivePlayers.Remove(_playerHealth);

        // if (alivePlayers.Count <= 1)
        // {
        //     StartCoroutine(EndRound());
        // }
    }

    public void RegisterPlayer(ulong _clientId)
    {
        if (!IsServer) return;
        
        foreach (var _s in playerScores)
            if (_s.ClientId == _clientId) return;
        
        playerScores.Add(new PlayerScore { ClientId = _clientId, Score = 0 });
    }

    private IEnumerator EndRound(ulong _winnerClientId)
    {
        isRoundActive.Value = false;

        string _winner = _winnerClientId != 0 ? $"Player {_winnerClientId} wins!" : "No winner";

        RoundEndedClientRPC(_winner);

        yield return new WaitForSeconds(roundStartDelay);

        currentRound.Value++;
        StartCoroutine(StartRoundWithDelay());

    }

    private void RespawnAllPlayers()
    {
        if (!IsServer) return;

        var _allPlayers = FindObjectsByType<PlayerHealth>(FindObjectsSortMode.None);

        alivePlayers.Clear();

        for (int _q = 0; _q < _allPlayers.Length; _q++)
        {
            Vector3 _spawnPosition = spawnPoints[_q % spawnPoints.Length].position;

            _allPlayers[_q].Respawn(_spawnPosition);
            alivePlayers.Add(_allPlayers[_q]);
        }
    }

    private IEnumerator StartRoundWithDelay()
    {
        yield return new WaitForSeconds(1f);

        yield return new WaitUntil(() => 
            FindObjectsByType<PlayerHealth>(FindObjectsSortMode.None).Length >= 2);

        RespawnAllPlayers();
        isRoundActive.Value = true;
        RoundStartedClientRPC(currentRound.Value);
    }

    [ClientRpc]
    private void RoundStartedClientRPC(int _round)
    {
        Debug.Log($"Round {_round} started");
    }

    [ClientRpc]
    private void RoundEndedClientRPC(string _winnerText)
    {
        Debug.Log($"Round ended: {_winnerText}");
    }

    public bool IsRoundActive => isRoundActive.Value;

    public override void OnNetworkDespawn()
    {
        if (IsServer && Current == this)
            Current = null;

        currentRound.OnValueChanged -= OnRoundChanged;
        isRoundActive.OnValueChanged -= OnRoundStateChanged;
    }

    private void OnRoundChanged(int _previousValue, int _newValue)
    {
        
    }

    private void OnRoundStateChanged(bool _previousValue, bool _newValue)
    {

    }
}