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 PlayerDataManager _playerDataManager;

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

        // Lounge Elements
        private Label _loungeRoomName;
        private Button _readyBtn, _startBtn;
        
        // Host Slot
        private Label _hostNameLabel, _hostStatusLabel;
        private VisualElement _hostChatBox;
        private Label _hostChatMessage;

        // Guest Slot
        private Label _guestNameLabel, _guestStatusLabel;
        private VisualElement _guestChatBox;
        private Label _guestChatMessage;

        // Chat Input
        private TextField _chatInput;

        public override void Initialize(VisualElement uxmlRoot, UIManager manager)
        {
            base.Initialize(uxmlRoot, manager);

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

            // Create Room Fields
            _roomIDInput = root.Q<TextField>("RoomIDInput");
            _roomNameInput = root.Q<TextField>("RoomNameInput");
            _roomPassInput = root.Q<TextField>("RoomPassInput");
            _passToggle = root.Q<Toggle>("PassToggle");
            _createErrorLabel = root.Q<Label>("CreateErrorLabel");

            // Join Room Fields
            _roomList = root.Q<ScrollView>("RoomList");
            _joinPassInput = root.Q<TextField>("JoinPassInput");
            _joinPassError = root.Q<Label>("JoinPassError");

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

            // Host Slot
            _hostNameLabel = root.Q<Label>("HostName");
            _hostStatusLabel = root.Q<Label>("HostReadyStatus");
            _hostChatBox = root.Q<VisualElement>("HostChatBox");
            _hostChatMessage = root.Q<Label>("HostChatMessage");

            // Guest Slot
            _guestNameLabel = root.Q<Label>("GuestName");
            _guestStatusLabel = root.Q<Label>("GuestReadyStatus");
            _guestChatBox = root.Q<VisualElement>("GuestChatBox");
            _guestChatMessage = root.Q<Label>("GuestChatMessage");

            // Chat Input
            _chatInput = root.Q<TextField>("ChatInput");

            // Event Bindings
            root.Q<Button>("GoToCreateBtn").clicked += ShowCreate;
            root.Q<Button>("CancelCreateBtn").clicked += ShowJoin;
            root.Q<Button>("BackToMenuBtn").clicked += async () => await uiManager.Pop();
            
            _confirmCreateBtn = root.Q<Button>("ConfirmCreateBtn");
            if (_confirmCreateBtn != null) _confirmCreateBtn.clicked += OnCreateRoomClicked;

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

            if (_chatInput != null)
            {
                _chatInput.RegisterCallback<KeyDownEvent>(OnChatKeyDown, TrickleDown.TrickleDown);
            }

            if (LocalizationManager.Instance != null)
            {
                LocalizationManager.Instance.OnLanguageChanged += ApplyLocalization;
                ApplyLocalization();
            }

            // Đăng ký sự kiện từ Spawner
            if (BasicSpawner.Instance != null)
            {
                RegisterSpawnerEvents();
            }
            else
            {
                Invoke(nameof(RegisterSpawnerEvents), 0.1f);
            }
        }

        private void RegisterSpawnerEvents()
        {
            if (BasicSpawner.Instance == null) return;
            BasicSpawner.Instance.OnSessionListUpdatedEvent += UpdateRoomList;
            BasicSpawner.Instance.OnJoinFailedEvent += () => { if(_joinPassError != null) _joinPassError.style.display = DisplayStyle.Flex; };
            BasicSpawner.Instance.OnJoinStartedEvent += () => { };
        }

        private void OnChatKeyDown(KeyDownEvent evt)
        {
            if (evt.keyCode == KeyCode.Return || evt.keyCode == KeyCode.KeypadEnter)
            {
                evt.StopImmediatePropagation();
                evt.PreventDefault();

                string msg = _chatInput.value.Trim();
                if (!string.IsNullOrEmpty(msg) && PlayerDataManager.Instance != null)
                {
                    var runner = Object.FindFirstObjectByType<NetworkRunner>();
                    if (runner != null)
                    {
                        PlayerDataManager.Instance.RPC_SendChatMessage(runner.LocalPlayer, msg);
                        _chatInput.value = "";
                        // Re-focus after clearing
                        _chatInput.Focus();
                    }
                }
            }
        }

        private void OnChatMessageReceived(PlayerRef sender, string message)
        {
            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            if (runner == null) return;

            // Kiểm tra sender là Host hay Guest
            bool isHost = sender.PlayerId == 1; // Trong Host Mode, người tạo phòng luôn có ID 1

            if (isHost)
            {
                ShowChatBubble(_hostChatBox, _hostChatMessage, message);
            }
            else
            {
                ShowChatBubble(_guestChatBox, _guestChatMessage, message);
            }
        }

        private async void ShowChatBubble(VisualElement box, Label label, string msg)
        {
            if (box == null || label == null) return;
            label.text = msg;
            box.style.display = DisplayStyle.Flex;
            await Task.Delay(4000);
            if (label.text == msg) // Chỉ ẩn nếu chưa có tin nhắn mới đè lên
                box.style.display = DisplayStyle.None;
        }

        private void OnDestroy()
        {
            if (LocalizationManager.Instance != null)
            {
                LocalizationManager.Instance.OnLanguageChanged -= ApplyLocalization;
            }
        }

        private void ApplyLocalization()
        {
            if (LocalizationManager.Instance == null) return;

            // JOIN VIEW
            var joinHeading = root.Q<Label>(null, "text-heading"); // Header in JoinContainer
            if (joinHeading != null && _joinContainer.Contains(joinHeading)) joinHeading.text = GetT("LOBBY_FIND_SESSIONS");
            
            var searchInput = root.Q<TextField>("SearchInput");
            if (searchInput != null) searchInput.textEdition.placeholder = GetT("LOBBY_SEARCH_PLACEHOLDER");
            
            var backBtn = root.Q<Button>("BackToMenuBtn");
            if (backBtn != null) backBtn.text = GetT("LOBBY_BACK");
            
            var goToCreateBtn = root.Q<Button>("GoToCreateBtn");
            if (goToCreateBtn != null) goToCreateBtn.text = GetT("LOBBY_CREATE_NEW");

            // CREATE VIEW
            var createHeader = _createContainer?.Q<Label>(null, "text-heading");
            if (createHeader != null) createHeader.text = GetT("LOBBY_CREATE_HEADER");

            _createContainer?.Query<Label>().ForEach(l => {
                if (l.text.Contains("ROOM ID")) l.text = GetT("LOBBY_ROOM_ID_LABEL");
                if (l.text.Contains("ROOM NAME")) l.text = GetT("LOBBY_ROOM_NAME_LABEL");
            });

            if (_roomIDInput != null) _roomIDInput.textEdition.placeholder = GetT("LOBBY_ROOM_ID_PLACEHOLDER");
            if (_roomNameInput != null) _roomNameInput.textEdition.placeholder = GetT("LOBBY_ROOM_NAME_PLACEHOLDER");
            if (_passToggle != null) _passToggle.label = GetT("LOBBY_REQUIRE_PASS");
            if (_roomPassInput != null) _roomPassInput.textEdition.placeholder = GetT("LOBBY_PASS_PLACEHOLDER");
            
            var cancelCreateBtn = root.Q<Button>("CancelCreateBtn");
            if (cancelCreateBtn != null) cancelCreateBtn.text = GetT("LOBBY_CANCEL");
            
            if (_confirmCreateBtn != null) _confirmCreateBtn.text = GetT("LOBBY_CREATE_BTN");

            // LOUNGE VIEW
            if (_loungeRoomName != null && _loungeRoomName.text == "SESSION NAME") 
                _loungeRoomName.text = GetT("LOBBY_SESSION_NAME_DEFAULT");
            
            var loungeIdLabel = root.Q<Label>("LoungeID");
            if (loungeIdLabel != null) 
            {
                string currentId = loungeIdLabel.text.Replace("ID: ", "");
                loungeIdLabel.text = GetT("LOBBY_ID_PREFIX") + currentId;
            }

            var vsLabel = _loungeContainer?.Q<Label>(null); // VS label doesn't have name
            _loungeContainer?.Query<Label>().ForEach(l => {
                if (l.text == "VS") l.text = GetT("LOBBY_VS");
            });

            if (_chatInput != null) _chatInput.textEdition.placeholder = GetT("LOBBY_CHAT_PLACEHOLDER");
            
            var leaveLoungeBtn = root.Q<Button>("LeaveLoungeBtn");
            if (leaveLoungeBtn != null) leaveLoungeBtn.text = GetT("LOBBY_LEAVE_BTN");

            // PASSWORD OVERLAY
            var passOverlayTitle = _passOverlay?.Q<Label>(null, "text-subheading");
            if (passOverlayTitle != null) passOverlayTitle.text = GetT("LOBBY_PROTECTED_TITLE");
            
            var passOverlayDesc = _passOverlay?.Q<Label>(null, "text-label");
            if (passOverlayDesc != null && passOverlayDesc.text.Contains("requires a password")) 
                passOverlayDesc.text = GetT("LOBBY_PROTECTED_DESC");

            if (_joinPassInput != null) _joinPassInput.textEdition.placeholder = GetT("LOBBY_JOIN_PASS_PLACEHOLDER");
            if (_joinPassError != null) _joinPassError.text = GetT("LOBBY_JOIN_PASS_ERROR");
            
            var closePassBtn = root.Q<Button>("ClosePassBtn");
            if (closePassBtn != null) closePassBtn.text = GetT("LOBBY_CANCEL");
            
            var confirmJoinBtn = root.Q<Button>("ConfirmJoinBtn");
            if (confirmJoinBtn != null) confirmJoinBtn.text = GetT("LOBBY_JOIN_BTN");
        }

        private string GetT(string key) => LocalizationManager.Instance != null ? LocalizationManager.Instance.GetLocalizedString(key) : key;

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

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

        public void ShowJoin()
        {
            if (_joinContainer != null) _joinContainer.style.display = DisplayStyle.Flex;
            if (_createContainer != null) _createContainer.style.display = DisplayStyle.None;
            if (_loungeContainer != null) _loungeContainer.style.display = DisplayStyle.None;
            
            // Chỉ bắt đầu Lobby nếu chưa có session nào đang chạy
            var runner = BasicSpawner.Instance?.Runner;
            if (runner == null || !runner.IsRunning)
            {
                _ = BasicSpawner.Instance?.StartLobby();
            }
        }

        public void ShowCreate()
        {
            if (_joinContainer != null) _joinContainer.style.display = DisplayStyle.None;
            if (_createContainer != null) _createContainer.style.display = DisplayStyle.Flex;
            if (_createErrorLabel != null) _createErrorLabel.style.display = DisplayStyle.None;
            if (_confirmCreateBtn != null) _confirmCreateBtn.SetEnabled(true);
            
            // Auto-generate ID when showing create screen
            if (_roomIDInput != null)
            {
                _roomIDInput.value = "ROOM_" + Random.Range(1000, 9999).ToString();
            }
        }

        private void ShowLounge(string roomName)
        {
            if (_joinContainer != null) _joinContainer.style.display = DisplayStyle.None;
            if (_createContainer != null) _createContainer.style.display = DisplayStyle.None;
            if (_loungeContainer != null) _loungeContainer.style.display = DisplayStyle.Flex;
            if (_loungeRoomName != null) _loungeRoomName.text = roomName.ToUpper();
            
            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            if (runner != null)
            {
                var loungeIdLabel = root.Q<Label>("LoungeID");
                if (loungeIdLabel != null) loungeIdLabel.text = GetT("LOBBY_ID_PREFIX") + runner.SessionInfo.Name;
            }

            _playerDataManager = Object.FindFirstObjectByType<PlayerDataManager>();
            if (_playerDataManager != null)
            {
                _playerDataManager.OnChatMessageReceived += OnChatMessageReceived;
            }
        }

        private async void OnCreateRoomClicked()
        {
            if (_confirmCreateBtn != null) _confirmCreateBtn.SetEnabled(false);
            if (_createErrorLabel != null) _createErrorLabel.style.display = DisplayStyle.None;

            var spawner = BasicSpawner.Instance;
            if (spawner == null) 
            {
                ShowCreateError("System Error: Spawner missing.");
                return;
            }

            // Auto-generate ID if empty
            string id = (_roomIDInput != null && !string.IsNullOrEmpty(_roomIDInput.value)) 
                ? _roomIDInput.value.Trim() 
                : "ROOM_" + Random.Range(1000, 9999).ToString();

            if (_roomIDInput != null) _roomIDInput.value = id;

            // Name defaults to ID if empty
            string name = (_roomNameInput != null && !string.IsNullOrEmpty(_roomNameInput.value)) 
                ? _roomNameInput.value.Trim() 
                : id;
                
            string pass = (_passToggle != null && _passToggle.value && _roomPassInput != null) 
                ? _roomPassInput.value 
                : null;

            try 
            {
                bool success = await spawner.StartHost(id, name, pass);
                if (success)
                {
                    ShowLounge(name);
                }
                else
                {
                    ShowCreateError("Failed to create room. ID might be taken.");
                }
            }
            catch (System.Exception ex)
            {
                ShowCreateError("Network Error: " + ex.Message);
            }
        }

        private void ShowCreateError(string message)
        {
            if (_createErrorLabel != null)
            {
                _createErrorLabel.text = message;
                _createErrorLabel.style.display = DisplayStyle.Flex;
            }
            if (_confirmCreateBtn != null) _confirmCreateBtn.SetEnabled(true);
        }

        private void UpdateRoomList(List<SessionInfo> sessions)
        {
            if (_roomList == null) return;
            _roomList.Clear();
            foreach (var session in sessions)
            {
                if (_roomItemTemplate == null) continue;
                var item = _roomItemTemplate.Instantiate();
                
                string displayName = session.Name;
                if (session.Properties.TryGetValue("rn", out var rnProp))
                {
                    displayName = rnProp;
                }
                
                item.Q<Label>("RoomName").text = displayName;
                item.Q<Label>("PlayerCount").text = $"{session.PlayerCount}/{session.MaxPlayers}";
                
                var statusBadge = item.Q<Label>("StatusBadge");
                if (statusBadge != null) statusBadge.text = GetT("ROOM_STATUS_WAITING");
                
                bool needsPass = session.Properties.ContainsKey("pw"); 
                var lockIcon = item.Q<Label>("LockIcon");
                if (lockIcon != null) lockIcon.style.display = needsPass ? DisplayStyle.Flex : DisplayStyle.None;

                var joinBtn = item.Q<Button>("JoinBtn");
                if (joinBtn != null) 
                {
                    joinBtn.text = GetT("ROOM_JOIN_BTN");
                    joinBtn.clicked += () => OnRoomItemClicked(session);
                }
                
                _roomList.Add(item);
            }
        }

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

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

        private async Task JoinRoom(string sessionName, string password)
        {
            if (BasicSpawner.Instance != null)
            {
                bool success = await BasicSpawner.Instance.StartClient(sessionName, password);
                if (success) ShowLounge(sessionName);
            }
        }

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

        private void OnStartClicked()
        {
            BasicSpawner.Instance?.StartGame();
        }

        private async void OnLeaveLoungeClicked()
        {
            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            if (runner != null)
            {
                await runner.Shutdown();
            }
            if (_playerDataManager != null)
            {
                _playerDataManager.OnChatMessageReceived -= OnChatMessageReceived;
            }
            ShowJoin();
        }

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

        private void UpdateLoungeUI()
        {
            var runner = Object.FindFirstObjectByType<NetworkRunner>();
            if (runner == null) return;

            if (_playerDataManager == null)
            {
                _playerDataManager = Object.FindFirstObjectByType<PlayerDataManager>();
                if (_playerDataManager != null)
                {
                    _playerDataManager.OnChatMessageReceived += OnChatMessageReceived;
                }
            }

            if (_playerDataManager == null || _playerDataManager.Object == null || !_playerDataManager.Object.IsValid) return;

            PlayerRef hostRef = PlayerRef.None;
            PlayerRef guestRef = PlayerRef.None;

            var sortedPlayers = runner.ActivePlayers.OrderBy(p => p.PlayerId).ToList();
            if (sortedPlayers.Count > 0) hostRef = sortedPlayers[0];
            if (sortedPlayers.Count > 1) guestRef = sortedPlayers[1];

            if (runner.SessionInfo != null && runner.SessionInfo.Properties.TryGetValue("rn", out var rnProp))
            {
                _loungeRoomName.text = rnProp.ToString().ToUpper();
            }

            if (hostRef != PlayerRef.None && _playerDataManager.TryGetPlayerMetaData(hostRef, out var hostData))
            {
                _hostNameLabel.text = hostData.Name.ToString().ToUpper();
                _hostStatusLabel.text = hostData.IsReady ? GetT("LOBBY_READY") : GetT("LOBBY_NOT_READY");
                _hostStatusLabel.style.color = hostData.IsReady ? Color.green : Color.red;
            }
            else if (hostRef != PlayerRef.None)
            {
                _hostNameLabel.text = GetT("LOBBY_SYNCING");
                _hostStatusLabel.text = "-";
            }

            if (guestRef != PlayerRef.None && _playerDataManager.TryGetPlayerMetaData(guestRef, out var guestData))
            {
                _guestNameLabel.text = guestData.Name.ToString().ToUpper();
                _guestStatusLabel.text = guestData.IsReady ? GetT("LOBBY_READY") : GetT("LOBBY_NOT_READY");
                _guestStatusLabel.style.color = guestData.IsReady ? Color.green : Color.red;
            }
            else if (runner.ActivePlayers.Count() >= 2)
            {
                _guestNameLabel.text = GetT("LOBBY_SYNCING");
                _guestStatusLabel.text = "-";
            }
            else
            {
                _guestNameLabel.text = GetT("LOBBY_WAITING_LABEL");
                _guestStatusLabel.text = "-";
                _guestStatusLabel.style.color = Color.gray;
            }

            bool allReady = true;
            int playerCount = 0;
            foreach (var p in runner.ActivePlayers)
            {
                playerCount++;
                if (_playerDataManager.TryGetPlayerMetaData(p, out var data))
                {
                    if (!data.IsReady) allReady = false;
                }
                else
                {
                    allReady = false;
                }
            }

            bool isHost = runner.LocalPlayer == hostRef;

            if (_startBtn != null)
            {
                _startBtn.text = GetT("LOBBY_START_BTN");
                _startBtn.style.display = isHost ? DisplayStyle.Flex : DisplayStyle.None;
                _startBtn.SetEnabled(allReady && playerCount >= 2);
            }

            if (_readyBtn != null)
            {
                if (_playerDataManager.TryGetPlayerMetaData(runner.LocalPlayer, out var myData))
                {
                    if (myData.IsReady)
                    {
                        _readyBtn.text = GetT("LOBBY_UNREADY_BTN");
                        _readyBtn.style.backgroundColor = new StyleColor(Color.green);
                        _readyBtn.style.color = new StyleColor(Color.black);
                    }
                    else
                    {
                        _readyBtn.text = GetT("LOBBY_READY_BTN");
                        _readyBtn.style.backgroundColor = new StyleColor(new Color(0.2f, 0.2f, 0.2f, 0.8f));
                        _readyBtn.style.color = new StyleColor(Color.white);
                    }
                }
            }
        }

        private async void Invoke(string methodName, float delay)
        {
            await Task.Delay((int)(delay * 1000));
            if (methodName == nameof(RegisterSpawnerEvents)) RegisterSpawnerEvents();
        }
    }
}