using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Xml.Linq;
using ToDoApp.Model;
using ToDoApp.Service;

namespace ToDoApp.SubWindow
{
    /// <summary>
    /// JoinWindow.xaml에 대한 상호 작용 논리
    /// </summary>
    public partial class JoinWindow : Window
    {
        public JoinWindow()
        {
            InitializeComponent();
        }

        private bool VerifyInfo()
        {
            if (!CheckName(tbName.Text))
                return false;

            if (!CheckPassword(pbPassword.Password, pbVerification.Password))
                return false;

            if (!CheckEmail(tbEmail.Text))
                return false;

            return true;
        }

        private bool CheckName(string name)
        {
            if (string.IsNullOrEmpty(name))
            {
                tbMessage.Text = "사용자 이름을 입력하세요.";
                tbMessage.Visibility = Visibility.Visible;
                return false;
            }

            User? user = UserService.Instance.FindUser(name);
            if (user != null)
            {
                tbMessage.Text = "사용할 수 없는 이름입니다.";
                tbMessage.Visibility = Visibility.Visible;
                return false;
            }
            else
            {
                tbMessage.Visibility = Visibility.Collapsed;
                return true;
            }
        }

        private bool CheckPassword(string password, string verification)
        {
            if (string.IsNullOrEmpty(password) || string.IsNullOrEmpty(verification))
            {
                tbMessage.Text = "비밀번호를 입력하세요.";
                tbMessage.Visibility = Visibility.Visible;
                return false;
            }

            if (password != verification)
            {
                tbMessage.Text = "비밀번호가 일치하지 않습니다.";
                tbMessage.Visibility = Visibility.Visible;
                return false;
            }
            else
            {
                tbMessage.Visibility = Visibility.Collapsed;
                return true;
            }
        }

        private bool CheckEmail(string email)
        {
            if (string.IsNullOrEmpty(email))
                return true;

            try
            {
                MailAddress addr = new MailAddress(email);
                if (addr.Address != email)
                {
                    tbMessage.Text = "이메일 형식이 올바르지 않습니다.";
                    tbMessage.Visibility = Visibility.Visible;
                    return false;
                }
                else
                {
                    tbMessage.Visibility = Visibility.Collapsed;
                    return true;
                }
            }
            catch
            {
                tbMessage.Text = "이메일 형식이 올바르지 않습니다.";
                tbMessage.Visibility = Visibility.Visible;
                return false;
            }
        }


        private void btnJoin_Click(object sender, RoutedEventArgs e)
        {
            if (!VerifyInfo())
            {
                MessageBox.Show("가입할 수 없습니다.");
                return;
            }

            User user = new User()
            {
                Name = tbName.Text,
                Email = tbEmail.Text,
                Password = pbPassword.Password,
                CreateDate = DateTime.Now,
                Status = UserStatus.Valid
            };

            UserService.Instance.CreateUser(user);

            MessageBox.Show("가입되었습니다.");
            this.Close();
        }

        private void PasswordChanged(object sender, RoutedEventArgs e)
        {
            CheckPassword(pbPassword.Password, pbVerification.Password);
        }

        private void tbEmail_TextChanged(object sender, TextChangedEventArgs e)
        {
            CheckEmail(tbEmail.Text);
        }

        private void tb_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key != Key.Enter)
                return;

            btnJoin_Click(this, null);
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            tbName.Focus();
        }
    }
}