using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Database
{
    abstract class OleDBDataGridViewHandler
    {
        protected string nameTable;
        private int idIndex;
        public OleDbDataAdapter select;
        private DataGridView dataGridView;
        protected OleDBDataGridViewHandler(OleDbCommand selectCommand, string nameTable, DataGridView dataGridView, int idIndex = 0)
        {
            this.nameTable = nameTable;
            this.idIndex = idIndex;
            select = new OleDbDataAdapter(selectCommand);
            this.dataGridView = dataGridView;
            this.dataGridView.DataSource = new DataTable();
            RefreshView();
            var lastColIndex = dataGridView.Columns.Count - 1;
            var lastColumn = dataGridView.Columns[lastColIndex];
            lastColumn.AutoSizeMode = DataGridViewAutoSizeColumnMode.Fill;
        }
        protected OleDBDataGridViewHandler(string nameTable, DataGridView dataGridView, string fields = "*", int idIndex = 0)
            : this(OleDBHandler.SelectCommand(nameTable, fields), nameTable, dataGridView, idIndex)
        { }
        protected void RefreshView()
        {
            var dataTable = this.dataGridView.DataSource as DataTable;
            dataTable.Clear();
            select.Fill(dataTable);
        }
        protected int CurrentId()
        {
            if (dataGridView.SelectedCells.Count < 1)
                return -1;
            var selectedRowIndex = dataGridView.SelectedCells[0].RowIndex;
            var value = dataGridView.Rows[selectedRowIndex].Cells[idIndex].Value;
            return Convert.ToInt32(value);
        }
        public void Delete()
        {
            int id = CurrentId();
            if (id < 0)
                return;
            OleDBHandler.Delete(nameTable, id);
            RefreshView();
        }
    }
}