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

namespace YourNamespace.Forms
{
    public partial class FormEmployee : Form
    {
        private readonly IEmployeeRepository _employeeRepository;
        private int? _employeeId;

        public int Id
        {
            set
            {
                try
                {
                    var employee = _employeeRepository.ReadEmployeeById(value);
                    if (employee == null)
                    {
                        throw new InvalidDataException(nameof(employee));
                    }
                    textBoxFirstName.Text = employee.FirstName;
                    textBoxLastName.Text = employee.LastName;
                    comboBoxPost.SelectedItem = employee.EmployeePost;
                    _employeeId = value;
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Ошибка при получении данных", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
        }

        public FormEmployee(IEmployeeRepository employeeRepository)
        {
            InitializeComponent();
            _employeeRepository = employeeRepository ?? throw new ArgumentNullException(nameof(employeeRepository));

            comboBoxPost.DataSource = Enum.GetValues(typeof(EmployeePost));
        }

        private void ButtonSave_Click(object sender, EventArgs e)
        {
            try
            {
                if (string.IsNullOrWhiteSpace(textBoxFirstName.Text) || string.IsNullOrWhiteSpace(textBoxLastName.Text) || comboBoxPost.SelectedIndex < 0)
                {
                    throw new Exception("Имеются незаполненные поля");
                }
                if (_employeeId.HasValue)
                {
                    _employeeRepository.UpdateEmployee(CreateEmployee(_employeeId.Value));
                }
                else
                {
                    _employeeRepository.CreateEmployee(CreateEmployee(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 Employee CreateEmployee(int id) => Employee.CreateEntity(id, textBoxFirstName.Text, textBoxLastName.Text, (EmployeePost)comboBoxPost.SelectedItem);
    }
}