teachers_mvvm/Teachers/ViewModels/AddTeacherViewModel.cs

using Avalonia;
using Avalonia.Controls;
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using Avalonia.Threading;
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using Microsoft.EntityFrameworkCore;
using MsBox.Avalonia;
using MsBox.Avalonia.Enums;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using Teachers.Models;
using Teachers.Views;

namespace Teachers.ViewModels
{
    internal class AddTeacherViewModel : ViewModelBase
    {
        //создаем нового учителя для дальнейшего добавления в бд
        Teacher? _newTeacher;
        public Teacher? NewTeacher { get => _newTeacher; set => this.RaiseAndSetIfChanged(ref _newTeacher, value); }
        string _buttonText;
        public string ButtonText { get => _buttonText; set => this.RaiseAndSetIfChanged(ref _buttonText, value); }

        public AddTeacherViewModel()
        {
            _newTeacher = new Teacher()
            {
                GenderNavigation = new Gender()
            };
            _newCourse = new Course();
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            _courseWindow = new Window();
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            _buttonText = "Добавить";
        }
        public AddTeacherViewModel(int idTeacher)
        {
            _newTeacher = MainWindowViewModel.myConnection.Teachers
                .Include(x => x.GenderNavigation)
                .Include(x => x.TeacherCourses).ThenInclude(x => x.IdCourseNavigation)
                .Include(x => x.SubjectsTaughts).ThenInclude(x => x.IdSubjectNavigation).FirstOrDefault(x => x.Id == idTeacher);
            _newCourse = new Course();
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            _courseWindow = new Window();
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            CoursesTable = NewTeacher.TeacherCourses.ToList();
            SubjectsTable = NewTeacher.SubjectsTaughts.ToList();
            _buttonText = "Сохранить изменения";
        }

        #region Comboboxes
        //поля и свойства для работы со связью М:М
        List<TeacherCourse> _coursesTable;
        List<SubjectsTaught> _subjectsTable;
        public List<TeacherCourse> CoursesTable { get => _coursesTable; set => this.RaiseAndSetIfChanged(ref _coursesTable, value); }
        public List<SubjectsTaught> SubjectsTable { get => _subjectsTable; set => this.RaiseAndSetIfChanged(ref _subjectsTable, value); }

        //листы для отображения в комбобоксах (там где М:М в листы входят только те элементы, которых нету в листах-выбранных-значений
        //List<Gender> _gendersL = [new Gender() { Id = 0, Gender1 = "Выберите пол" }, .. MainWindowViewModel.myConnection.Genders.ToList()];
        List<Course> _coursesL = [new Course() { Id = 0, Name = "Выберите курс" }, .. MainWindowViewModel.myConnection.Courses.ToList()];
        List<Subject> _subjectL = [new Subject() { Id = 0, Name = "Выберите предмет" }, .. MainWindowViewModel.myConnection.Subjects.ToList()];
        //public List<Gender> GendersL => _gendersL;
        public List<Gender> GendersL => MainWindowViewModel.myConnection.Genders.ToList();
        public List<Course> CoursesL
        {
            get => _coursesL
            .Except(_newTeacher.TeacherCourses.Select(x => x.IdCourseNavigation)).ToList();
            set
            {
                _coursesL = value;
                this.RaisePropertyChanged(nameof(CoursesL));
            }
    }
        public List<Subject> SubjectsL => _subjectL
            .Except(_newTeacher.SubjectsTaughts.Select(x => x.IdSubjectNavigation)).ToList();

        //свойства для добавления выбранных элементов в другой лист и удаления из исходного
        //Gender? selectedGender;
        //public Gender? SelectedGender
        //{
        //    get
        //    {
        //        if (selectedGender == null)
        //        {
        //            return _gendersL[0];
        //        }
        //        else
        //        {
        //            return selectedGender;
        //        }
        //        //return selectedGender;
        //    }
        //    set
        //    {
        //        if (value != null)
        //        {
        //            NewTeacher.Gender = value.Id;
        //        }
        //    }
        //}
        Course? selectedCourse;
        public Course? SelectedCourse
        {
            get
            {
                if (selectedCourse == null)
                {
                    return _coursesL[0];
                }
                else
                {
                    return selectedCourse;
                }
            }
            set
            {
                if (value != null)
                {
                    NewTeacher.TeacherCourses.Add 
                        (new TeacherCourse()
                        {
                            IdTeacherNavigation = NewTeacher, 
                            IdCourseNavigation = value
                        });
                    CoursesTable = NewTeacher.TeacherCourses.ToList(); 
                    this.RaisePropertyChanged(nameof(CoursesL));
                }
            }
        }
        Subject? selectedSubject;
        public Subject? SelectedSubject
        {
            get
            {
                if (selectedSubject == null)
                {
                    return _subjectL[0];
                }
                else
                {
                    return selectedSubject;
                }
            }
            set
            {
                if (value != null)
                {
                    NewTeacher.SubjectsTaughts.Add
                        (new SubjectsTaught()
                        {
                            IdTeacherNavigation = NewTeacher,
                            IdSubjectNavigation = value
                        });
                    SubjectsTable = NewTeacher.SubjectsTaughts.ToList();
                    this.RaisePropertyChanged(nameof(SubjectsL));
                }
            }
        }





        //методы для удаления выбранных курсов и предметов (М:М)
        public void DeleteCourse(TeacherCourse courseForDelete)
        {
            NewTeacher.TeacherCourses.Remove(courseForDelete);
            CoursesTable = NewTeacher.TeacherCourses.ToList(); //обновляем лист с выбранными значениями
            this.RaisePropertyChanged(nameof(CoursesL)); //обновляем лист с исходными значениями
        }
        public void DeleteSubject(SubjectsTaught subjectForDelete)
        {
            NewTeacher.SubjectsTaughts.Remove(subjectForDelete);
            SubjectsTable = NewTeacher.SubjectsTaughts.ToList(); //обновляем лист с выбранными значениями
            this.RaisePropertyChanged(nameof(SubjectsL)); //обновляем лист с исходными значениями
        }
        #endregion


        public void AddTeacher()
        {
            try
            {
                if (NewTeacher.Id == 0) //если текущего учителя не существует, т.е. в объекте newTeacher его Id равен 0, мы добавляем нового
                {
                    MainWindowViewModel.myConnection.Teachers.Add(NewTeacher);
                }
                MainWindowViewModel.myConnection.SaveChanges();
                MessageBoxManager.GetMessageBoxStandard("Успех", "Учитель успешно добавлен!", MsBox.Avalonia.Enums.ButtonEnum.Ok);
                MainWindowViewModel.Instance.Us = new TeachersView();
            }
            catch (Exception ex)
            {
                MessageBoxManager.GetMessageBoxStandard("Внимание", ex.Message + "\n" + ex.StackTrace, MsBox.Avalonia.Enums.ButtonEnum.Ok).ShowAsync();
            }
        }

        public void ToTeachersView()
        {
            MainWindowViewModel.Instance.Us = new TeachersView();
        }

        Course? _newCourse;
        public Course? NewCourse { get => _newCourse; set => this.RaiseAndSetIfChanged(ref _newCourse, value); }
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        Window _courseWindow;
        public Window CourseWindow { get => _courseWindow; set => this.RaiseAndSetIfChanged(ref _courseWindow, value); }
        bool rubilnik = true;
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        public async Task ShowAddCourse()
        {
            var window = new Window();
            window.Width = 400;
            window.Height = 225;
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            window.Content = new AddCourseView();
            window.Show();
        }

        public void UpdateList()
        {
            //_coursesL = [new Course() { Id = 0, Name = "Выберите курс" }, .. MainWindowViewModel.myConnection.Courses.ToList()];
            CoursesL = _coursesL
            .Except(_newTeacher.TeacherCourses.Select(x => x.IdCourseNavigation)).ToList();
            this.RaisePropertyChanged(nameof(CoursesL));
            Dispatcher.UIThread.Post(() => { this.RaisePropertyChanged(nameof(CoursesL)); });
            AddTeacherView atv = new();
            atv.UpdatePage();
            //this.RaisePropertyChanged(nameof(_coursesL));
            //Teacher? buf = _newTeacher;
            //MainWindowViewModel.Instance.Us = new AddTeacherView();
            //_newTeacher = buf;
            //NewTeacher = buf;
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            //CourseWindow.Content = new AddCourseView();
            window.Content = new AddCourseView();
            window.Show();
            //if (result)
            //{

            //}
            //CourseWindow.Show();

            //window.DataContext = new AddTeacherViewModel { CourseWindow = window };
            //_courseWindow = window;
            //if (rubilnik)
            //{
            //    window.Show();
            //    window.Content = new AddCourseView();
            //}
            //else window.Close();

        }


        public void CloseWindow()
        {
            CourseWindow.Close();
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        }
    }
}