using C969Project.Data;
using C969Project.Data.Models;

namespace C969Project
{
    public partial class LoginForm : Form
    {
        public LoginForm()
        {
            InitializeComponent();
            
            loginLabel.Text = Localization.GetLocalization("login_text");
            usernameTextBox.PlaceholderText = Localization.GetLocalization("username_text");
            passwordTextBox.PlaceholderText = Localization.GetLocalization("password_text");
            loginButton.Text = Localization.GetLocalization("login_text");
            
            loginButton.Enabled = false;
            usernameTextBox.TextChanged += (sender, args) => {UpdateLoginButtonState();};
            passwordTextBox.TextChanged += (sender, args) => {UpdateLoginButtonState();};
            loginButton.Click += LoginButtonOnClick;
        }
        
        private void LoginButtonOnClick(object? sender, EventArgs e)
        {
            var usr = DatabaseHelper.Login(usernameTextBox.Text, passwordTextBox.Text);

            if (usr is null)
            {
                MessageBox.Show(Localization.GetLocalization("login_error_message"), "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            
            LogHistory(usr);
            Console.WriteLine($"Login successful, {usr.Username}");
            AppState.CurrentUser = usr;

            CheckForAppointments();
            
            var dash = new DashboardForm();
            dash.FormClosing += (o, args) => { Close(); };
            dash.Show();
            Hide();
        }

        private void CheckForAppointments()
        {
            if (AppState.CurrentUser is null)
            {
                MessageBox.Show("A problem occured retrieving appointments.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
            
            var appointments = DatabaseHelper.RetrieveAppointments(AppState.CurrentUser.UserId);
            
            DateTime nowUtc = DateTime.UtcNow;
            DateTime fifteenMinutesFromNowUtc = nowUtc.AddMinutes(15);
            
            var upcoming = appointments
                .Where(a => a.Start >= nowUtc && a.Start <= fifteenMinutesFromNowUtc)
                .OrderBy(a => a.Start)
                .ToList();
        
            if (upcoming.Any())
            {
                var appt = upcoming.First();
                DateTime localStart = appt.Start.ToLocalTime();
                MessageBox.Show(
                    $"You have an upcoming {appt.AppointmentType} appointment '{appt.Title}' at {localStart}.",
                    "Upcoming Appointment",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Information);
            }
        }

        private void UpdateLoginButtonState()
        {
            if (string.IsNullOrEmpty(usernameTextBox.Text) || string.IsNullOrEmpty(passwordTextBox.Text))
            {
                loginButton.Enabled = false;
            }
            else
            {
                loginButton.Enabled = true;    
            }
        }

        private void LogHistory(User user)
        {
            string text = $"{DateTime.UtcNow} UTC : {user.Username}";
            using StreamWriter sw = new StreamWriter("Login_History.txt", true);
            sw.WriteLine(text);
        }
    }
}