using GasStation.Entities;
using GasStation.Repositories;


namespace GasStation.Forms
{
    public partial class FormSelling : Form
    {
        private readonly ISellingRepository _sellingRepository;

        public FormSelling(ISellingRepository sellingRepository, IGasmanRepository gasmanRepository, IProductRepository productRepository)
        {
            InitializeComponent();
            _sellingRepository = sellingRepository ??
                throw new ArgumentNullException(nameof(sellingRepository));
            
            comboBoxGasman.DataSource = gasmanRepository.ReadGasman();
            comboBoxGasman.DisplayMember = "GasmanName";
            comboBoxGasman.ValueMember = "ID";

            ColumnProduct.DataSource = productRepository.ReadProduct();
            ColumnProduct.DisplayMember = "ProductType";
            ColumnProduct.ValueMember = "ID";
        }

        private void ButtonSave_Click(object sender, EventArgs e)
        {
            try
            {
                if (comboBoxGasman.SelectedIndex < 0 ||
                    dataGridViewSelling.RowCount < 1)
                {
                    throw new Exception("Имеются незаполненые поля");
                }

                _sellingRepository.CreateSelling(Selling.CreateSelling(0, (int)comboBoxGasman.SelectedValue!,
                    0, CreateProductSellingsFromDataGrid()));

                Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Ошибка при сохранении", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }

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

        private List<ProductSelling> CreateProductSellingsFromDataGrid()
        {
            var list = new List<ProductSelling>();
            foreach (DataGridViewRow row in dataGridViewSelling.Rows)
            {
                if (row.Cells["ColumnProduct"].Value == null || row.Cells["ColumnCount"].Value == null)
                {
                    continue;
                }

                list.Add(ProductSelling.CreateSelling(0, Convert.ToInt32(row.Cells["ColumnProduct"].Value), 
                    Convert.ToInt32(row.Cells["ColumnCount"].Value)));
            }

            return list.GroupBy(x => x.ProductID, x => x.Count, (id, counts) => ProductSelling.CreateSelling(0, id,counts.Sum())).ToList();
            ;
        }

    }
}