using Npgsql;
using System.Data;
namespace DeviceAdmin
{
    public partial class FormStaff : Form
    {
        NpgsqlConnection connection = Program.connection;
        private DataTable dataTable;
        private NpgsqlDataAdapter adapter;
        public FormStaff()
        {
            InitializeComponent();
            LoadGridView();
        }
        private void LoadGridView()
        {
            adapter = new NpgsqlDataAdapter("SELECT * FROM staff;", connection);
            dataTable = new DataTable();
            adapter.Fill(dataTable);
            dataGridView.DataSource = dataTable;
            DataGridViewColumnCollection columns = dataGridView.Columns;
            columns[0].HeaderText = "ID";
            columns[1].HeaderText = "ФИО";
            columns[2].HeaderText = "Отдел";
        }
        private void ButtonAdd_Click(object sender, EventArgs e)
        {
            NpgsqlCommand command = new NpgsqlCommand("INSERT INTO staff VALUES (nextval('seq_staff'), @surname || ' ' || @name || ' ' ||@patronymic, @department);", connection);
            command.Parameters.AddWithValue("@surname", textBoxSurname.Text);
            command.Parameters.AddWithValue("@name", textBoxName.Text);
            command.Parameters.AddWithValue("@patronymic", textBoxPatronymic.Text);
            command.Parameters.AddWithValue("@department", textBoxDepartment.Text);
            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 staff SET full_name = @surname || ' ' || @name || ' ' ||@patronymic, department = @department WHERE Id = @Id", connection);
                command.Parameters.AddWithValue("@Id", id);
                command.Parameters.AddWithValue("@surname", textBoxSurname.Text);
                command.Parameters.AddWithValue("@name", textBoxName.Text);
                command.Parameters.AddWithValue("@patronymic", textBoxPatronymic.Text);
                command.Parameters.AddWithValue("@department", textBoxDepartment.Text);
                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 staff 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();
        }
    }
}