using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace ADA1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            PopulateGrid();
        }
        MySqlConnection connection = new MySqlConnection(
            $"datasource = 127.0.0.1; port = 3306; username =root; password = password; " +
            $"database = Ada;sslmode = none;" +
            $" ");
        private void PopulateGrid()
        {

            var command = new MySqlCommand("SELECT * FROM elevi",connection);
            var reader = new MySqlDataAdapter(command);
            var data = new DataTable();
            connection.Open();
            reader.Fill(data);
            grid.DataSource = data;
            grid.DataMember = data.TableName;
            connection.Close();
            /*
            getMax("Nota");
            MessageBox.Show("COUNT");
            count("Nota");
            MessageBox.Show("Order");
            order("Nota");
            */
            MessageBox.Show("SUM");
            sum("Nota");
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {

            if (CheckDuplicate(T2.Text) || CheckDuplicate(T1.Text))
            {
                MessageBox.Show("DUPLICATE");
                return;
            }
            var command = new MySqlCommand($"INSERT INTO elevi(nume,id,nota) Values('{T1.Text}',{T2.Text},{T3.Text})", connection);
            connection.Open();
            command.ExecuteNonQuery();
            connection.Close();
        }

        private void Delete_Click(object sender, EventArgs e)
        {
            var command = new MySqlCommand($"delete from elevi where id = {D1.Text}",connection);
            connection.Open();
            command.ExecuteNonQuery();
            connection.Close();
        }

        private bool CheckDuplicate(string value)
        {
            connection.Open();
            var list = new LinkedList<string>();
            var command = new MySqlCommand("select * from elevi",connection);
            var reader = command.ExecuteReader();
            while (reader.Read())
            {
                list.AddLast(reader.GetString(0));
                list.AddLast(reader.GetString(1));
                list.AddLast(reader.GetString(2));
            }
            connection.Close();
            return list.Contains(value);
        }

        private void getMax(string column)
        {
            connection.Open();
            var command = new MySqlCommand($"Select Max({column}) FROM ELEVI", connection);
            var reader = command.ExecuteReader();
            while (reader.Read())
            {
                MessageBox.Show(reader.GetString(0));
            }
            connection.Close();
        }

        private void count(string column)
        {
            connection.Open();
            var cmd = new MySqlCommand($"SELECT COUNT({column}) From Elevi",connection);
            var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                MessageBox.Show(reader.GetString(0));
            }
            connection.Close();
        }

        private void order(string column)
        {
            connection.Open();
            var cmd = new MySqlCommand($"SELECT * From Elevi Order by {column} DESC",connection);
            var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                MessageBox.Show(reader.GetString(0));

            }
            connection.Close();
        }

        private void sum(string column)
        {
            connection.Open();
            var cmd = new MySqlCommand($"SELECT SUM({column}) FROM ELEVI", connection);
            var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                MessageBox.Show(reader.GetString(0));
            }
            connection.Close();
        }
    }
}