using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Fusion;
using Fusion.Sockets;
using UnityEngine;
using OnlyScove.Scripts;

namespace Hallucinate.UI
{
    public class BasicSpawner : MonoBehaviour, INetworkRunnerCallbacks
    {
        public static BasicSpawner Instance { get; private set; }
        private NetworkRunner _runner;

        public event Action<List<SessionInfo>> OnSessionListUpdatedEvent;
        public event Action<string> OnShutdownEvent;
        public event Action OnJoinStartedEvent;
        public event Action OnJoinFailedEvent;

        private void Awake()
        {
            if (Instance != null && Instance != this)
            {
                Destroy(gameObject);
                return;
            }
            Instance = this;
            DontDestroyOnLoad(gameObject);
        }

        public PlayerProfile LocalPlayerProfile { get; private set; }
        public void SetLocalPlayerProfile(PlayerProfile _profile)
        {
            LocalPlayerProfile = _profile;
        }

        private async Task EnsureRunnerExists()
        {
            if (_runner == null)
            {
                _runner = GetComponent<NetworkRunner>();
            }

            if (_runner != null && _runner.IsRunning)
            {
                await _runner.Shutdown();
            }

            if (_runner == null)
            {
                _runner = gameObject.AddComponent<NetworkRunner>();
            }

            _runner.ProvideInput = true;
            _runner.RemoveCallbacks(this);
            _runner.AddCallbacks(this);
        }

        public async Task StartLobby()
        {
            await EnsureRunnerExists();
            
            var result = await _runner.JoinSessionLobby(SessionLobby.ClientServer);
            if (!result.Ok) 
            {
                Debug.LogError($"Failed to join lobby: {result.ShutdownReason}. Check AppID type or Network/Firewall.");
            }
        }

        public async Task<bool> StartHost(string sessionName, string password = null)
        {
            OnJoinStartedEvent?.Invoke();

            // 1. Kiểm tra Build Settings
            bool sceneExists = false;
            for (int i = 0; i < UnityEngine.SceneManagement.SceneManager.sceneCountInBuildSettings; i++)
            {
                if (UnityEngine.SceneManagement.SceneUtility.GetScenePathByBuildIndex(i).Contains("Main Scene"))
                {
                    sceneExists = true;
                    break;
                }
            }

            if (!sceneExists)
            {
                Debug.LogError("CRITICAL: 'Main Scene' is NOT in Build Settings!");
                return false;
            }

            // 2. Khởi tạo Runner mới sạch sẽ
            await EnsureRunnerExists();

            var customProps = new Dictionary<string, SessionProperty>();
            if (!string.IsNullOrEmpty(password))
            {
                customProps.Add("pw", password);
            }

            var result = await _runner.StartGame(new StartGameArgs()
            {
                GameMode = GameMode.Host,
                SessionName = sessionName,
                SessionProperties = customProps,
                PlayerCount = 2,
                // Thêm fixed region để tránh timeout khi tìm server
                // SceneManager sẽ tự động add nếu thiếu
                SceneManager = gameObject.GetComponent<NetworkSceneManagerDefault>() ?? gameObject.AddComponent<NetworkSceneManagerDefault>()
            });

            if (result.Ok)
            {
                return true;
            }
            else
            {
                Debug.LogError($"Fusion StartHost Failed: {result.ShutdownReason}.");
                OnJoinFailedEvent?.Invoke();
                return false;
            }
        }

        public async Task<bool> StartClient(string sessionName, string password = null)
        {
            OnJoinStartedEvent?.Invoke();
            await EnsureRunnerExists();

            var result = await _runner.StartGame(new StartGameArgs()
            {
                GameMode = GameMode.Client,
                SessionName = sessionName,
                SceneManager = gameObject.GetComponent<NetworkSceneManagerDefault>() ?? gameObject.AddComponent<NetworkSceneManagerDefault>()
            });

            if (result.Ok)
            {
                return true;
            }
            else
            {
                Debug.LogError($"Fusion StartClient Failed: {result.ShutdownReason}");
                OnJoinFailedEvent?.Invoke();
                return false;
            }
        }

        // --- Các phương thức Callbacks ---
        [SerializeField] private NetworkPrefabRef _playerPrefab;
        private Dictionary<PlayerRef, NetworkObject> _spawnedCharacters = new Dictionary<PlayerRef, NetworkObject>();

        public void OnPlayerJoined(NetworkRunner runner, PlayerRef player)
        {
            if (player == runner.LocalPlayer)
            {
                var pdm = FindFirstObjectByType<PlayerDataManager>();
                if (pdm != null)
                {
                    string playerName = "Player";
                    _Role playerRole = _Role.Seeker;

                    if (LocalPlayerProfile != null)
                    {
                        playerName = LocalPlayerProfile.Name;
                    }

                    var metaData = new _PlayerMetaData()
                    {
                        Name = playerName,
                        Role = playerRole,
                        IsReady = false
                    };
                    pdm.RPC_UpdatePlayerMetaData(player, metaData);
                }
            }
        }

        public void StartGame()
        {
            if (_runner != null && _runner.IsServer)
            {
                _runner.LoadScene("Main Scene");
            }
        }

        public void OnPlayerLeft(NetworkRunner runner, PlayerRef player)
        {
            if (_spawnedCharacters.TryGetValue(player, out NetworkObject networkObject))
            {
                runner.Despawn(networkObject);
                _spawnedCharacters.Remove(player);
                // Chỉ Shutdown nếu người thoát chính là Server (Host)
                if (runner.IsServer && player == runner.LocalPlayer) 
                {
                    runner.Shutdown();
                }
            }
        }

        public void OnShutdown(NetworkRunner runner, ShutdownReason shutdownReason)
        {
            Debug.LogWarning($"[Fusion] Shutdown occurred. Reason: {shutdownReason}");
            OnShutdownEvent?.Invoke(shutdownReason.ToString());
        }

        public void OnSessionListUpdated(NetworkRunner runner, List<SessionInfo> sessionList)
        {
            OnSessionListUpdatedEvent?.Invoke(sessionList);
        }

        public void OnInput(NetworkRunner runner, NetworkInput input)
        {
            var data = new PlayerInputData();
            if (PlayerStateMachine.Local != null && PlayerStateMachine.Local.Input != null)
            {
                data.Direction = PlayerStateMachine.Local.Input.MoveInput;
                data.sprint = PlayerStateMachine.Local.Input.IsSprintHeld;
                if (PlayerStateMachine.Local.Cam != null)
                    data.rot = PlayerStateMachine.Local.Cam.PlanarRotation;
            }
            input.Set(data);
        }

        public void OnConnectedToServer(NetworkRunner runner) { }
        public void OnDisconnectedFromServer(NetworkRunner runner, NetDisconnectReason reason) { }
        public void OnConnectRequest(NetworkRunner runner, NetworkRunnerCallbackArgs.ConnectRequest request, byte[] token) { }
        public void OnConnectFailed(NetworkRunner runner, NetAddress remoteAddress, NetConnectFailedReason reason) { }
        public void OnUserSimulationMessage(NetworkRunner runner, SimulationMessagePtr message) { }
        public void OnReliableDataReceived(NetworkRunner runner, PlayerRef player, ReliableKey key, ArraySegment<byte> data) { }
        public void OnReliableDataProgress(NetworkRunner runner, PlayerRef player, ReliableKey key, float progress) { }
        public void OnInputMissing(NetworkRunner runner, PlayerRef player, NetworkInput input) { }
        public void OnObjectExitAOI(NetworkRunner runner, NetworkObject obj, PlayerRef player) { }
        public void OnObjectEnterAOI(NetworkRunner runner, NetworkObject obj, PlayerRef player) { }
        public void OnCustomAuthenticationResponse(NetworkRunner runner, Dictionary<string, object> data) { }
        public void OnHostMigration(NetworkRunner runner, HostMigrationToken hostMigrationToken) { }
        
        public void OnSceneLoadDone(NetworkRunner runner)
        {
            string currentSceneName = UnityEngine.SceneManagement.SceneManager.GetActiveScene().name;
            if (runner.IsServer && currentSceneName == "Main Scene")
            {
                foreach (var player in runner.ActivePlayers)
                {
                    Vector2 spawnPosition = (player == runner.LocalPlayer) ? new Vector2(-8, 0) : new Vector2(8, 0);
                    var networkPlayerObject = runner.Spawn(_playerPrefab, spawnPosition, Quaternion.identity, player);
                    _spawnedCharacters.Add(player, networkPlayerObject);
                }
            }
            if (currentSceneName == "Main Scene")
                UIManager.Instance?.OnGameStarted();
            else if (currentSceneName == "Lobby" || currentSceneName == "Menu")
                UIManager.Instance?.OnBackToMenu();
        }

        public void OnSceneLoadStart(NetworkRunner runner) { }
    }
}