using UnityEngine;
using UnityEngine.UIElements;
using System.Threading.Tasks;

namespace Hallucinate.UI
{
    public class LoginController : BaseUIController
    {
        private TextField _nameInput;
        private Label _errorLabel;
        private Button _confirmBtn;

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

            _nameInput = root.Q<TextField>("UsernameInput");
            _errorLabel = root.Q<Label>("ErrorMsg");
            _confirmBtn = root.Q<Button>("ConfirmBtn");

            if (_confirmBtn != null)
                _confirmBtn.clicked += OnConfirmClicked;
        }

        private async void OnConfirmClicked()
        {
            string username = _nameInput.value.Trim();

            if (string.IsNullOrEmpty(username))
            {
                ShowError("Name cannot be empty!");
                return;
            }

            _confirmBtn.SetEnabled(false);
            _confirmBtn.text = "CHECKING...";

            // 1. Kiểm tra trùng tên trên Firebase
            bool isTaken = await FirebaseService.IsUsernameTaken(username);

            if (isTaken)
            {
                ShowError("This name is already taken!");
                _confirmBtn.SetEnabled(true);
                _confirmBtn.text = "CONFIRM";
            }
            else
            {
                // 2. Đăng ký user mới
                bool success = await FirebaseService.RegisterUser(username);
                if (success)
                {
                    // 3. Lưu lại và đóng popup
                    PlayerPrefs.SetString("Username", username);
                    PlayerPrefs.Save();
                    Debug.Log($"[Login] Registered as {username}");
                    
                    // Thông báo cho UIManager biết đã login xong
                    uiManager.OnLoginSuccess();
                    await PlayTransitionOut();
                }
                else
                {
                    ShowError("Connection error!");
                    _confirmBtn.SetEnabled(true);
                    _confirmBtn.text = "CONFIRM";
                }
            }
        }

        private void ShowError(string msg)
        {
            if (_errorLabel == null) return;
            _errorLabel.text = msg;
            _errorLabel.style.display = DisplayStyle.Flex;
        }

        public override async Task PlayTransitionIn()
        {
            // Login hiện ra như một overlay trung tâm
            if (root != null)
            {
                root.style.translate = new StyleTranslate(new Translate(0, 0));
                root.style.opacity = 0;
            }
            Show();
            await PrimeTween.Tween.Custom(0f, 1f, duration: 0.5f, onValueChange: val => root.style.opacity = val);
        }
    }
}