using System;
using System.Windows.Forms;
using YourNamespace.Entities;
using YourNamespace.Repositories;

namespace YourNamespace.Forms
{
    public partial class FormTicket : Form
    {
        private readonly ITicketRepository _ticketRepository;
        private readonly IPassengerRepository _passengerRepository;
        private readonly IFlightRepository _flightRepository;
        private int? _ticketId;

        public int Id
        {
            set
            {
                try
                {
                    var ticket = _ticketRepository.ReadTicketById(value);
                    if (ticket == null)
                    {
                        throw new InvalidDataException(nameof(ticket));
                    }
                    comboBoxPassenger.SelectedValue = ticket.PassengerId;
                    comboBoxFlight.SelectedValue = ticket.FlightId;
                    dateTimePickerDateBuy.Value = ticket.DateBuy;
                    numericUpDownTicketPrice.Value = ticket.TicketPrice;
                    _ticketId = value;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Ошибка при получении данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
        }

        public FormTicket(ITicketRepository ticketRepository, IPassengerRepository passengerRepository, IFlightRepository flightRepository)
        {
            InitializeComponent();
            _ticketRepository = ticketRepository ?? throw new ArgumentNullException(nameof(ticketRepository));
            _passengerRepository = passengerRepository ?? throw new ArgumentNullException(nameof(passengerRepository));
            _flightRepository = flightRepository ?? throw new ArgumentNullException(nameof(flightRepository));

            comboBoxPassenger.DataSource = _passengerRepository.ReadPassengers();
            comboBoxPassenger.DisplayMember = "Name";
            comboBoxPassenger.ValueMember = "Id";

            comboBoxFlight.DataSource = _flightRepository.ReadFlights();
            comboBoxFlight.DisplayMember = "FlightNumber";
            comboBoxFlight.ValueMember = "Id";
        }

        private void ButtonSave_Click(object sender, EventArgs e)
        {
            try
            {
                if (comboBoxPassenger.SelectedIndex < 0 || comboBoxFlight.SelectedIndex < 0)
                {
                    throw new Exception("Имеются незаполненные поля");
                }
                if (_ticketId.HasValue)
                {
                    _ticketRepository.UpdateTicket(CreateTicket(_ticketId.Value));
                }
                else
                {
                    _ticketRepository.CreateTicket(CreateTicket(0));
                }
                Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Ошибка при сохранении", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void ButtonCancel_Click(object sender, EventArgs e) => Close();

        private Ticket CreateTicket(int id) => Ticket.CreateEntity(id, (int)comboBoxPassenger.SelectedValue, (int)comboBoxFlight.SelectedValue, dateTimePickerDateBuy.Value, (int)numericUpDownTicketPrice.Value);
    }
}