using MySql.Data.MySqlClient;
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 static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace test
{
    enum RowState 
    { 
        Existed, 
        New,
        Modified,
        ModifiedNew,
        Deleted
    }
    public partial class Form2 : Form 
    {
        int SelectedRow;
        string connect = "server=cfif31.ru;user=ISPr24-37_AnpilogovPV;database=ISPr24-37_AnpilogovPV_ekzam;password=ISPr24-37_AnpilogovPV"; 
        public Form2() 
        {
            InitializeComponent(); 
            CreateColumns();
        } 
        private void CreateColumns() 
        {
            dataGridView1.Columns.Add("idproducti", "id"); 
            dataGridView1.Columns.Add("name", "Название"); 
            dataGridView1.Columns.Add("cena", "Цена"); 
            dataGridView1.Columns.Add("isNew", string.Empty); 
        }
        private void ReadSingleRow(DataGridView dgw, IDataRecord record) 
        {
            dgw.Rows.Add(record.GetInt32(0), record.GetString(1), record.GetInt32(2), RowState.Existed); 
        }
        private void RefreshDataGrid(DataGridView dgw) 
        {
            dgw.Rows.Clear(); 
            string query = "SELECT idproducti, name, cena FROM producti"; 
            using (MySqlConnection connection = new MySqlConnection(connect)) 
            {
                try 
                {
                    connection.Open(); 
                    using (MySqlCommand command = new MySqlCommand(query, connection)) using (MySqlDataReader reader = command.ExecuteReader()) 
                    {
                        while (reader.Read()) 
                        {
                            ReadSingleRow(dgw, reader); 
                        }
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show($"Error: {ex.Message}"); 
                }
            }
        }
        private void Form2_Load(object sender, EventArgs e) 
        {
            RefreshDataGrid(dataGridView1); 
        } 
        private void Search(DataGridView dgw) 
        {
            dgw.Rows.Clear();
            string searchString = "SELECT idproducti, name, cena FROM producti WHERE CONCAT(idproducti, name, cena) LIKE '%" + textBox1.Text + "%'"; 
            using (MySqlConnection connection = new MySqlConnection(connect)) 
            {
                try 
                {
                    connection.Open(); 
                    using (MySqlCommand com = new MySqlCommand(searchString, connection)) using (MySqlDataReader read = com.ExecuteReader()) 
                    {
                        while (read.Read()) 
                        {
                            ReadSingleRow(dgw, read); 
                        }
                    }
                }
                catch (Exception ex) 
                {
                    MessageBox.Show($"Error: {ex.Message}"); 
                }
            }
        }
        private void textBox1_TextChanged(object sender, EventArgs e) 
        {
            Search(dataGridView1); 
        }
        private void deletRow() 
        {
            int index = dataGridView1.CurrentCell.RowIndex; 
            if (index >= 0) 
            {
                var id = dataGridView1.Rows[index].Cells[0].Value; 
                if (id != null && !string.IsNullOrEmpty(id.ToString())) 
                {
                    dataGridView1.Rows[index].Cells[3].Value = RowState.Deleted;
                    dataGridView1.Rows[index].Visible = false; 
                }
            }
        }
        private void button1_Click(object sender, EventArgs e) 
        {
            deletRow(); 
        }
        private void Save() 
        {
            using (MySqlConnection connection = new MySqlConnection(connect)) 
            {
                try 
                {
                    connection.Open(); 
                    for (int index = 0; index < dataGridView1.Rows.Count; index++) 
                    {
                        var rowState = (RowState)dataGridView1.Rows[index].Cells[3].Value; 
                        if (rowState == RowState.Deleted) 
                        {
                            var id = dataGridView1.Rows[index].Cells[0].Value; 
                            if (id != null && !string.IsNullOrEmpty(id.ToString())) 
                            {
                                using (MySqlCommand deleteCommandPlan = new MySqlCommand("DELETE FROM producti WHERE idproducti = @id", connection)) 
                                {
                                    deleteCommandPlan.Parameters.AddWithValue("@id", id); 
                                    deleteCommandPlan.ExecuteNonQuery(); 
                                }
                            }
                        }
                        if (rowState == RowState.Modified) 
                        {
                            var id = dataGridView1.Rows[index].Cells[0].Value.ToString(); 
                            var name = dataGridView1.Rows[index].Cells[1].Value.ToString();
                            var cena = dataGridView1.Rows[index].Cells[2].Value.ToString();
                            {
                                var changeQuery = "UPDATE producti SET name = @name, cena = @cena WHERE idproducti = @id";
                                using (var command = new MySqlCommand(changeQuery, connection)) 
                                {
                                    command.Parameters.AddWithValue("@id", id); 
                                    command.Parameters.AddWithValue("@name", name); 
                                    command.Parameters.AddWithValue("@cena", cena); 
                                    command.ExecuteNonQuery(); 
                                }
                            }
                        }
                    }
                }
                catch (Exception ex) 
                {
                    MessageBox.Show($"Error: {ex.Message}"); 
                }
            }
        }
        private void Change() 
        {
            var selectedRowIndex = dataGridView1.CurrentCell.RowIndex; 
            var id = textBox2.Text; 
            var name = textBox3.Text; 
            int cena; 
            if (dataGridView1.Rows[selectedRowIndex].Cells[0].Value.ToString() != string.Empty) 
            {
                if (int.TryParse(textBox4.Text, out cena)) 
                {
                    dataGridView1.Rows[selectedRowIndex].SetValues(id, name, cena); 
                    dataGridView1.Rows[selectedRowIndex].Cells[3].Value = RowState.Modified;
                }
            }
        }
        private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) 
        {
            SelectedRow = e.RowIndex;
            if (e.RowIndex >= 0) 
            {
                DataGridViewRow row = dataGridView1.Rows[SelectedRow];
                textBox2.Text = row.Cells[0].Value.ToString();
                textBox3.Text = row.Cells[1].Value.ToString();
                textBox4.Text = row.Cells[2].Value.ToString(); 
            }
        }
        private void ClearTextBox() 
        {
            textBox2.Text = ""; 
            textBox3.Text = ""; 
            textBox4.Text = "";
        }
        private void button4_Click(object sender, EventArgs e) 
        {
            Change(); 
        } 
        private void button3_Click(object sender, EventArgs e) 
        {
            Save();
            ClearTextBox();
        }
        private void button2_Click(object sender, EventArgs e) 
        {
            Form4 form4 = new Form4();
            form4.Show(); 
        }
    }
}