using MySql.Data.MySqlClient;
using NeshinaPolina07_11;
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;

namespace Neshina13
{
    public partial class Edit : Form
    {
        private int scheduleId; // ID записи для редактирования

        public Edit(int id)
        {
            InitializeComponent();
            this.scheduleId = id;
            LoadComboBoxes();
            LoadData();
        }

        private void LoadComboBoxes()
        {
            // Загрузка предметов
            string subjQuery = "SELECT StudySubject_Id, StudySubject_name FROM StudySubjects";
            FillComboBox(comboBox1, subjQuery, "StudySubject_name", "StudySubject_Id");

            // Загрузка групп
            string groupQuery = "SELECT Group_Id, CONCAT(GroupNum, ' - ', Group_Special) AS GroupInfo FROM `Group`";
            FillComboBox(comboBox2, groupQuery, "GroupInfo", "Group_Id");

            // Загрузка преподавателей
            string teacherQuery = "SELECT Teacher_Id, CONCAT(Teacher_FirstName, ' ', Teacher_LastName, ' ', Teacher_MiddleName) AS TeacherName FROM Teacher";
            FillComboBox(comboBox3, teacherQuery, "TeacherName", "Teacher_Id");

            // Загрузка ответственных (менеджеров)
            string managerQuery = "SELECT Manger_Id, CONCAT(Manager_FirstName, ' ', Manager_LastName, ' ', Manager_MiddleName) AS ManagerName FROM Mangers";
            FillComboBox(comboBox4, managerQuery, "ManagerName", "Manger_Id");
        }

        private void FillComboBox(ComboBox comboBox, string query, string displayMember, string valueMember)
        {
            try
            {
                var conn = DB.GetInstance().GetConnection();
                using (var adapter = new MySqlDataAdapter(query, conn))
                {
                    var table = new DataTable();
                    adapter.Fill(table);
                    comboBox.DataSource = table;
                    comboBox.DisplayMember = displayMember;
                    comboBox.ValueMember = valueMember;
                    comboBox.SelectedIndex = -1;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки данных: " + ex.Message);
            }
        }

        private void LoadData()
        {
            string query = @"
                SELECT 
                    Schedule_StudySubject_Id,
                    Schedule_Group_Id,
                    Schedule_Teacher_Id,
                    Schedule_ResponsiblMmanager,
                    Schedule_Date
                FROM Schedule
                WHERE Schedule_Id = @id";

            try
            {
                var conn = DB.GetInstance().GetConnection();
                using (var cmd = new MySqlCommand(query, conn))
                {
                    cmd.Parameters.AddWithValue("@id", scheduleId);

                    using (var reader = cmd.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            // Устанавливаем значения в комбобоксы и дату
                            comboBox1.SelectedValue = reader["Schedule_StudySubject_Id"];
                            comboBox2.SelectedValue = reader["Schedule_Group_Id"];
                            comboBox3.SelectedValue = reader["Schedule_Teacher_Id"];
                            comboBox4.SelectedValue = reader["Schedule_ResponsiblMmanager"];
                            dateTimePicker1.Value = Convert.ToDateTime(reader["Schedule_Date"]);
                        }
                        else
                        {
                            MessageBox.Show("Запись не найдена.");
                            this.DialogResult = DialogResult.Cancel;
                            this.Close();
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка загрузки данных для редактирования: " + ex.Message);
                this.DialogResult = DialogResult.Cancel;
                this.Close();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            

            try
            {
                var conn = DB.GetInstance().GetConnection();
                string updateQuery = @"
                    UPDATE Schedule SET
                        Schedule_StudySubject_Id = @subjectId,
                        Schedule_Group_Id = @groupId,
                        Schedule_Teacher_Id = @teacherId,
                        Schedule_ResponsiblMmanager = @managerId,
                        Schedule_Date = @date
                    WHERE Schedule_Id = @scheduleId";

                using (var cmd = new MySqlCommand(updateQuery, conn))
                {
                    cmd.Parameters.AddWithValue("@subjectId", comboBox1.SelectedValue);
                    cmd.Parameters.AddWithValue("@groupId", comboBox2.SelectedValue);
                    cmd.Parameters.AddWithValue("@teacherId", comboBox3.SelectedValue);
                    cmd.Parameters.AddWithValue("@managerId", comboBox4.SelectedValue);
                    cmd.Parameters.AddWithValue("@date", dateTimePicker1.Value.Date);
                    cmd.Parameters.AddWithValue("@scheduleId", scheduleId);

                    cmd.ExecuteNonQuery();
                }

                MessageBox.Show("Запись успешно обновлена!");
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ошибка при сохранении изменений: " + ex.Message);
            }
        }
    }
}