---

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Windows.Forms;
using System.Xml;

namespace WorkTimeTracker
{
    public partial class Form1 : Form
    {
        private List<Employee> employees = new List<Employee>();
        
        public Form1()
        {
            InitializeComponent();
            SetupDataGridView();
        }

        private void SetupDataGridView()
        {
            dataGridView1.Columns.Clear();
            dataGridView1.Columns.Add("Name", "ФИО");
            dataGridView1.Columns.Add("Hours", "Отработанные часы");
            dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(txtName.Text))
            {
                MessageBox.Show("Введите ФИО сотрудника!");
                return;
            }

            if (!double.TryParse(txtHours.Text, out double hours))
            {
                MessageBox.Show("Введите корректное количество часов!");
                return;
            }

            if (hours < 0)
            {
                MessageBox.Show("Часы не могут быть отрицательными!");
                return;
            }

            Employee emp = new Employee
            {
                Name = txtName.Text.Trim(),                Hours = hours
            };

            employees.Add(emp);
            UpdateDataGridView();
            CalculateTotalHours();

            txtName.Clear();
            txtHours.Clear();
            txtName.Focus();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            if (dataGridView1.CurrentRow != null)
            {
                int index = dataGridView1.CurrentRow.Index;
                employees.RemoveAt(index);
                UpdateDataGridView();
                CalculateTotalHours();
            }
            else
            {
                MessageBox.Show("Выберите запись для удаления!");
            }
        }

        private void btnExport_Click(object sender, EventArgs e)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog
            {
                Filter = "XML файлы|*.xml",
                FileName = "worktime.xml"
            };

            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    XmlWriterSettings settings = new XmlWriterSettings
                    {
                        Indent = true,
                        Encoding = System.Text.Encoding.UTF8
                    };

                    using (XmlWriter writer = XmlWriter.Create(saveFileDialog.FileName, settings))
                    {
                        writer.WriteStartDocument();
                        writer.WriteStartElement("worktime");
                        foreach (var emp in employees)
                        {
                            writer.WriteStartElement("employee");
                            writer.WriteAttributeString("name", emp.Name);
                            writer.WriteElementString("hours", emp.Hours.ToString());
                            writer.WriteEndElement();
                        }

                        writer.WriteEndElement();
                        writer.WriteEndDocument();
                    }

                    MessageBox.Show("Данные успешно экспортированы!");
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Ошибка экспорта: " + ex.Message);
                }
            }
        }

        private void btnShowReport_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog
            {
                Filter = "XML файлы|*.xml",
                FileName = "worktime.xml"
            };

            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    employees.Clear();
                    
                    XmlDocument doc = new XmlDocument();
                    doc.Load(openFileDialog.FileName);

                    XmlNodeList employeeNodes = doc.SelectNodes("//employee");

                    foreach (XmlNode node in employeeNodes)
                    {
                        Employee emp = new Employee();
                        
                        if (node.Attributes["name"] != null)
                            emp.Name = node.Attributes["name"].Value;
                        
                        XmlNode hoursNode = node.SelectSingleNode("hours");
                        if (hoursNode != null)
                            emp.Hours = double.Parse(hoursNode.InnerText);
                        employees.Add(emp);
                    }

                    UpdateDataGridView();
                    CalculateTotalHours();
                    
                    MessageBox.Show($"Загружено записей: {employees.Count}");
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Ошибка импорта: " + ex.Message);
                }
            }
        }

        private void UpdateDataGridView()
        {
            dataGridView1.Rows.Clear();
            foreach (var emp in employees)
            {
                dataGridView1.Rows.Add(emp.Name, emp.Hours.ToString("F2"));
            }
        }

        private void CalculateTotalHours()
        {
            double total = 0;
            foreach (var emp in employees)
            {
                total += emp.Hours;
            }
            lblTotalHours.Text = $"Общее количество часов: {total:F2}";
        }
    }
}