c969-project/C969Project/AppointmentsForm.cs

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

namespace C969Project;

public partial class AppointmentsForm : Form
{
    private List<Appointment> _appointments = new();
    private AddOrUpdateAppointmentForm _addOrUpdateAppointmentForm = new();
    
    public AppointmentsForm()
    {
        InitializeComponent();

        Shown += UpdateAppointmentsList;

        calendar.DateSelected += ShowAppointmentsFromSelectedDay;
        showAllButton.Click += UpdateAppointmentsList;
        deleteButton.Click += DeleteButtonOnClick;
        addButton.Click += AddButtonOnClick;
        modifyButton.Click += ModifyButtonOnClick;
    }

    private void ModifyButtonOnClick(object? sender, EventArgs e)
    {
        _addOrUpdateAppointmentForm.ShowDialog();
    }

    private void AddButtonOnClick(object? sender, EventArgs e)
    {
        _addOrUpdateAppointmentForm.ShowDialog();
    }

    private void DeleteButtonOnClick(object? sender, EventArgs e)
    {
        Appointment? selectedAppointment;
        if (appointmentDataView.CurrentRow?.DataBoundItem is Appointment appointment)
        {
            selectedAppointment = appointment;
        }
        else
        {
            MessageBox.Show("Error while trying to delete appointment");
            return;
        }
        
        var result = MessageBox.Show("Are you sure you want to delete this appointment?", "Delete Appointment?", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
        if (result == DialogResult.OK)
        {
            DatabaseHelper.DeleteAppointment(selectedAppointment);
            UpdateAppointmentsList(null, EventArgs.Empty);
        }
    }

    private void UpdateAppointmentsList(object? sender, EventArgs e)
    {
        appointmentDataView.DataSource = null;
        _appointments.Clear();
        _appointments.AddRange(DatabaseHelper.RetrieveAllAppointments(AppState.CurrentUser.UserId)); 
        appointmentDataView.DataSource = _appointments;
    }

    private void ShowAppointmentsFromSelectedDay(object? sender, EventArgs e)
    {
        var date = calendar.SelectionStart;
        List<Appointment>? selectedAppointments = _appointments.Where(a => a.Start == date).ToList();
        appointmentDataView.DataSource = selectedAppointments?.Count > 0 ? selectedAppointments : null;
    }
}