using UnityEngine;
using UnityEngine.UIElements;
using System.Collections.Generic;
using System.Threading.Tasks;
using Fusion;
using System.Linq;

namespace Hallucinate.UI
{
    public class LobbyController : BaseUIController
    {
        private VisualTreeAsset _roomItemTemplate;
        private _BasicSpawner _spawner;
        private _PlayerDataManager _playerDataManager;

        // Containers
        private VisualElement _joinContainer, _createContainer, _loungeContainer, _passOverlay;
        
        // Create Room Fields
        private TextField _roomIDInput, _roomNameInput, _roomPassInput;
        private Toggle _passToggle;
        
        // Join Room Fields
        private ScrollView _roomList;
        private TextField _joinPassInput;
        private Label _joinPassError;
        private SessionInfo _selectedSession;

        // Lounge Elements
        private VisualElement _playerListContainer;
        private Button _readyBtn, _startBtn;
        private Label _loungeRoomName;

        public override void Initialize(VisualElement uxmlRoot, UIManager manager)
        {
            base.Initialize(uxmlRoot, manager);
            _spawner = Object.FindFirstObjectByType<_BasicSpawner>();

            // Query Elements
            _joinContainer = root.Q<VisualElement>("JoinContainer");
            _createContainer = root.Q<VisualElement>("CreateContainer");
            _loungeContainer = root.Q<VisualElement>("LoungeContainer");
            _passOverlay = root.Q<VisualElement>("PasswordOverlay");

            _roomIDInput = root.Q<TextField>("RoomIDInput");
            _roomNameInput = root.Q<TextField>("RoomNameInput");
            _roomPassInput = root.Q<TextField>("RoomPassInput");
            _passToggle = root.Q<Toggle>("PassToggle");
            _roomList = root.Q<ScrollView>("RoomList");
            
            _joinPassInput = root.Q<TextField>("JoinPassInput");
            _joinPassError = root.Q<Label>("JoinPassError");

            // Lounge Elements
            _playerListContainer = root.Q<VisualElement>("PlayerList");
            _readyBtn = root.Q<Button>("ReadyBtn");
            _startBtn = root.Q<Button>("StartBtn");
            _loungeRoomName = root.Q<Label>("LoungeRoomName");

            // Event Bindings
            var goToCreateBtn = root.Q<Button>("GoToCreateBtn");
            if (goToCreateBtn != null) goToCreateBtn.clicked += ShowCreate;

            var cancelCreateBtn = root.Q<Button>("CancelCreateBtn");
            if (cancelCreateBtn != null) cancelCreateBtn.clicked += ShowJoin;

            var backToMenuBtn = root.Q<Button>("BackToMenuBtn");
            if (backToMenuBtn != null) backToMenuBtn.clicked += async () => await uiManager.Pop();

            var confirmCreateBtn = root.Q<Button>("ConfirmCreateBtn");
            if (confirmCreateBtn != null) confirmCreateBtn.clicked += OnCreateRoomClicked;

            var confirmJoinBtn = root.Q<Button>("ConfirmJoinBtn");
            if (confirmJoinBtn != null) confirmJoinBtn.clicked += OnConfirmPasswordClicked;

            var closePassBtn = root.Q<Button>("ClosePassBtn");
            if (closePassBtn != null) closePassBtn.clicked += () => { if(_passOverlay != null) _passOverlay.style.display = DisplayStyle.None; };

            var leaveLoungeBtn = root.Q<Button>("LeaveLoungeBtn");
            if (leaveLoungeBtn != null) leaveLoungeBtn.clicked += OnLeaveLoungeClicked;

            if (_readyBtn != null) _readyBtn.clicked += OnReadyClicked;
            if (_startBtn != null) _startBtn.clicked += OnStartClicked;

            if (_passToggle != null)
            {
                _passToggle.RegisterValueChangedCallback(evt => 
                {
                    if (_roomPassInput != null)
                        _roomPassInput.style.display = evt.newValue ? DisplayStyle.Flex : DisplayStyle.None;
                });
            }

            // Đăng ký sự kiện từ Spawner
            if (_spawner != null)
            {
                _spawner.OnSessionListUpdatedEvent += UpdateRoomList;
                _spawner.OnJoinFailedEvent += () => _joinPassError.style.display = DisplayStyle.Flex;
                _spawner.OnJoinStartedEvent += () => { /* Show loading if needed */ };
            }
        }

        public void SetRoomTemplate(VisualTreeAsset template) => _roomItemTemplate = template;

        public override async Task PlayTransitionIn()
        {
            await base.PlayTransitionIn();
            ShowJoin();
        }

        public void ShowJoin()
        {
            _joinContainer.style.display = DisplayStyle.Flex;
            _createContainer.style.display = DisplayStyle.None;
            _loungeContainer.style.display = DisplayStyle.None;
            _spawner?.StartLobby();
        }

        public void ShowCreate()
        {
            _joinContainer.style.display = DisplayStyle.None;
            _createContainer.style.display = DisplayStyle.Flex;
        }

        private void ShowLounge(string roomName)
        {
            _joinContainer.style.display = DisplayStyle.None;
            _createContainer.style.display = DisplayStyle.None;
            _loungeContainer.style.display = DisplayStyle.Flex;
            _loungeRoomName.text = $"Room: {roomName}";
            
            _playerDataManager = Object.FindFirstObjectByType<_PlayerDataManager>();
        }

        private async void OnCreateRoomClicked()
        {
            string id = _roomIDInput.value.Trim();
            string name = string.IsNullOrEmpty(_roomNameInput.value) ? id : _roomNameInput.value;
            string pass = _passToggle.value ? _roomPassInput.value : null;

            if (string.IsNullOrEmpty(id)) return;

            await _spawner.StartHost(id, pass);
            ShowLounge(name);
        }

        private void UpdateRoomList(List<SessionInfo> sessions)
        {
            if (_roomList == null) return;
            _roomList.Clear();
            foreach (var session in sessions)
            {
                var item = _roomItemTemplate.Instantiate();
                item.Q<Label>("RoomName").text = session.Name;
                item.Q<Label>("PlayerCount").text = $"{session.PlayerCount}/{session.MaxPlayers}";
                
                bool needsPass = session.Properties.ContainsKey("pw"); 
                item.Q<Label>("LockIcon").style.display = needsPass ? DisplayStyle.Flex : DisplayStyle.None;

                var joinBtn = item.Q<Button>("JoinBtn");
                joinBtn.clicked += () => OnRoomItemClicked(session);
                
                _roomList.Add(item);
            }
        }

        private void OnRoomItemClicked(SessionInfo session)
        {
            bool needsPass = session.Properties.ContainsKey("pw");
            if (needsPass)
            {
                _selectedSession = session;
                _passOverlay.style.display = DisplayStyle.Flex;
                _joinPassError.style.display = DisplayStyle.None;
                _joinPassInput.value = "";
            }
            else
            {
                JoinRoom(session.Name, null);
            }
        }

        private async void OnConfirmPasswordClicked()
        {
            if (_selectedSession == null) return;
            string pass = _joinPassInput.value;
            _passOverlay.style.display = DisplayStyle.None;
            await JoinRoom(_selectedSession.Name, pass);
        }

        private async Task JoinRoom(string sessionName, string password)
        {
            await _spawner.StartClient(sessionName, password);
            ShowLounge(sessionName);
        }

        private void OnReadyClicked()
        {
            if (_playerDataManager != null)
            {
                var runner = Object.FindFirstObjectByType<NetworkRunner>();
                if (runner != null)
                {
                    _playerDataManager.TryGetPlayerMetaData(runner.LocalPlayer, out var myData);
                    _playerDataManager.RPC_SetReady(runner.LocalPlayer, !myData.IsReady);
                }
            }
        }

        private void OnStartClicked()
        {
            _spawner.StartGame();
        }

        private void OnLeaveLoungeClicked()
        {
            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            runner?.Shutdown();
            ShowJoin();
        }

        public override void Update()
        {
            if (_loungeContainer.style.display == DisplayStyle.Flex)
            {
                UpdateLoungeUI();
            }
        }

        private void UpdateLoungeUI()
        {
            if (_playerDataManager == null)
            {
                _playerDataManager = Object.FindFirstObjectByType<_PlayerDataManager>();
                return;
            }

            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            if (runner == null) return;

            // Update Player List
            _playerListContainer.Clear();
            bool allReady = true;
            int playerCount = 0;

            foreach (var kvp in _playerDataManager.Players)
            {
                playerCount++;
                var playerRef = kvp.Key;
                var data = kvp.Value;

                var playerItem = new VisualElement();
                playerItem.style.flexDirection = FlexDirection.Row;
                playerItem.style.justifyContent = Justify.SpaceBetween;
                playerItem.style.paddingBottom = 5;

                var nameLabel = new Label(data.Name.ToString());
                var readyLabel = new Label(data.IsReady ? "READY" : "WAITING...");
                readyLabel.style.color = data.IsReady ? Color.green : Color.yellow;

                playerItem.Add(nameLabel);
                playerItem.Add(readyLabel);
                _playerListContainer.Add(playerItem);

                if (!data.IsReady) allReady = false;
            }

            // Update Buttons
            _startBtn.style.display = (runner.IsServer && allReady && playerCount >= 2) ? DisplayStyle.Flex : DisplayStyle.None;
            
            _playerDataManager.TryGetPlayerMetaData(runner.LocalPlayer, out var myData);
            _readyBtn.text = myData.IsReady ? "UNREADY" : "READY UP";
        }
    }
}