using System;
using System.Text.RegularExpressions;
using _Network.Auth;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

namespace _Hub.Scripts.UI
{
    public class LoginUI : MonoBehaviour
    {
        #region Variables

        private const int _maxUsernameLength = 15;
        private const int _maxPasswordLength = 15;
        [SerializeField] private AuthButton loginButton;
        [SerializeField] private AuthInputField usernameInputField;
        [SerializeField] private AuthInputField passwordInputField;
        private string _username = String.Empty;
        private string _password = String.Empty;

        #endregion

        #region Unity

        private void Start()
        {
            AddListeners();
        }

        private void AddListeners()
        {
            loginButton.Button.onClick.AddListener(OnLoginClick);
            usernameInputField.InputField.onValueChanged.AddListener(UpdateUsername);
            passwordInputField.InputField.onValueChanged.AddListener(UpdatePassword);
        }

        private void OnLoginClick()
        {
        }

        private void UpdateUsername(string username)
        {
            _username = username;
            Debug.Log("Username:" + username);
            ValidateAndUpdateUI();
        }

        private void UpdatePassword(string password)
        {
            _password = password;
            Debug.Log("Password:" + password);
            ValidateAndUpdateUI();
        }

        private void ValidateAndUpdateUI()
        {
            var usernameRegex = Regex.Match(_username, "^[a-zA-Z0-9]+$");
            var interactable = (!string.IsNullOrWhiteSpace(_username) && !string.IsNullOrWhiteSpace(_password) &&
                                (_maxUsernameLength >= _username.Length && _maxPasswordLength >= _password.Length) &&
                                usernameRegex.Success);
            EnableLoginButton(interactable);

            UpdateInputErrors(usernameRegex);
        }

        private void UpdateInputErrors(Match usernameRegex)
        {
            //Username
            if (string.IsNullOrEmpty(_username))
            {
                usernameInputField.Error(false);
            }
            else
            {
                var usernameTooLong = _username.Length > _maxUsernameLength;
                usernameInputField.Error(usernameTooLong || !usernameRegex.Success);
            }

            //Password
            if (string.IsNullOrEmpty(_password))
            {
                usernameInputField.Error(false);
            }
            else
            {
                var passwordTooLong = _password.Length > _maxPasswordLength;
                passwordInputField.Error(passwordTooLong);
            }
        }

        private void EnableLoginButton(bool interactable)
        {
            loginButton.SetInteractable(interactable);
        }

        #endregion
    }
}