using Npgsql;
using System.Data;
namespace DeviceAdmin
{
    public partial class FormKinds : Form
    {
        NpgsqlConnection connection = Program.connection;
        private DataTable dataTable;
        private NpgsqlDataAdapter adapter;
        public FormKinds()
        {
            InitializeComponent();
            LoadGridView();
        }
        private void LoadGridView()
        {
            adapter = new NpgsqlDataAdapter("SELECT * FROM kinds;", connection);
            dataTable = new DataTable();
            adapter.Fill(dataTable);
            dataGridView.DataSource = dataTable;
            DataGridViewColumnCollection columns = dataGridView.Columns;
            columns[0].HeaderText = "ID";
            columns[1].HeaderText = "Название";
            columns[2].HeaderText = "Част. обсл.";
        }
        private void ButtonAdd_Click(object sender, EventArgs e)
        {
            NpgsqlCommand command = new NpgsqlCommand("INSERT INTO kinds VALUES (nextval('seq_kinds'), @title, @frequency);", connection);
            command.Parameters.AddWithValue("@title", textBoxTitle.Text);
            if (int.Parse(numericUpDownFrequency.Value.ToString()) != 0)
            {
                command.Parameters.AddWithValue("@frequency", int.Parse(numericUpDownFrequency.Value.ToString()));
            }
            else
            {
                command.Parameters.AddWithValue("@frequency", 12);
                }
            command.ExecuteNonQuery();
            LoadGridView();
        }
        private void ButtonEdit_Click(object sender, EventArgs e)
        {
            if (dataGridView.SelectedRows.Count > 0)
            {
                int id = (int)dataGridView.SelectedRows[0].Cells[0].Value;
                NpgsqlCommand command = new NpgsqlCommand("UPDATE kinds SET title = @title, frequency = @frequency WHERE Id = @Id", connection);
                command.Parameters.AddWithValue("@Id", id);
                command.Parameters.AddWithValue("@title", textBoxTitle.Text);
                if (int.Parse(numericUpDownFrequency.Value.ToString()) != 0)
                {
                    command.Parameters.AddWithValue("@frequency", int.Parse(numericUpDownFrequency.Value.ToString()));
                }
                else
                {
                    command.Parameters.AddWithValue("@frequency", 12);
                }
                command.ExecuteNonQuery();
                LoadGridView();
            }
            else
            {
                MessageBox.Show("Please select a row to edit.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        private void ButtonDelete_Click(object sender, EventArgs e)
        {
            if (dataGridView.SelectedRows.Count > 0)
            {
                int id = (int)dataGridView.SelectedRows[0].Cells[0].Value;
                NpgsqlCommand command = new NpgsqlCommand("DELETE FROM kinds WHERE Id = @Id", connection);
                command.Parameters.AddWithValue("@Id", id);
                command.ExecuteNonQuery();
                LoadGridView();
            }
            else
            {
                MessageBox.Show("Please select a row to delete.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        private void ButtonRefresh_Click(object sender, EventArgs e)
        {
            LoadGridView();
        }
    }
}