AvaloniaDB/TeacheresAndCourses/ViewModels/AddTeacherViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using MsBox.Avalonia;
using MsBox.Avalonia.Enums;
using ReactiveUI;
using TeacheresAndCourses.Models;

namespace TeacheresAndCourses.ViewModels
{
	public class AddTeacherViewModel : ViewModelBase
    {

        string buttonText;
        public string ButtonText { get => buttonText; set => this.RaiseAndSetIfChanged(ref buttonText, value); }

        Teacher? newTeacher;
        public Teacher? NewTeacher { get => newTeacher; set => this.RaiseAndSetIfChanged(ref newTeacher, value); }

        public List<TeachersAndSubject>? teacSubjectsList;
        public List<TeachersAndSubject>? TeacSubjectsList { get => teacSubjectsList; set => this.RaiseAndSetIfChanged(ref teacSubjectsList, value); }

        public List<TeachersAndCourse>? teacCoursesList;
        public List<TeachersAndCourse>? TeacCoursesList { get => teacCoursesList; set => this.RaiseAndSetIfChanged(ref teacCoursesList, value); }

        public AddTeacherViewModel() {
            newTeacher = new Teacher() { GenderNavigation = new Gender() };
            ButtonText = "Äîáàâèòü";
        }

        public AddTeacherViewModel(int teacherId)
        {
            newTeacher = MainWindowViewModel.connection.Teachers.Include(x=>x.GenderNavigation).Include(x=>x.TeachersAndCourses).ThenInclude(x=>x.Course).
                Include(x=>x.TeachersAndSubjects).ThenInclude(x=>x.Subject).FirstOrDefault(x=>x.Teacherid== teacherId);
            TeacSubjectsList = NewTeacher.TeachersAndSubjects.ToList();
            TeacCoursesList = NewTeacher.TeachersAndCourses.ToList();
            ButtonText = "Ñîõðàíèòü èçìåíåíèÿ";
        }

        public List<Course> courseList => MainWindowViewModel.connection.Courses.ToList().Except(newTeacher.TeachersAndCourses.Select(x => x.Course)).ToList();
        public List<Subject> subjectList => MainWindowViewModel.connection.Subjects.ToList().Except(newTeacher.TeachersAndSubjects.Select(x=>x.Subject)).ToList();
        public List<Gender> genderList => MainWindowViewModel.connection.Genders.ToList();

        // Äîáàâëåíèå âûáðàííîãî ïðåäìåòà â ñïèñîê
        Subject? newSub;
        public Subject? NewSub { get => null; 
            set {
                if (value!=null)
                {
                    NewTeacher.TeachersAndSubjects.Add(new TeachersAndSubject() { Teacher = NewTeacher, Subject = value });
                    TeacSubjectsList = NewTeacher.TeachersAndSubjects.ToList();
                    this.RaisePropertyChanged(nameof(subjectList));
                }
            } }

        // Äîáàâëåíèå âûáðàííîãî êóðñà â ñïèñîê
        Course? newCou;
        public Course? NewCou
        {
            get => null;
            set
            {
                if (value != null)
                {
                    NewTeacher.TeachersAndCourses.Add(new TeachersAndCourse() { Teacher = NewTeacher, Course = value });
                    TeacCoursesList = NewTeacher.TeachersAndCourses.ToList();
                    this.RaisePropertyChanged(nameof(courseList));
                }
            }
        }


        // Óäàëåíèå ïðåäìåòà èç ñïèñêà ñ äîáàâëåííûìè ïðåäìåòàìè
        public void DeleteSub(TeachersAndSubject deleteSub)
        {
            NewTeacher.TeachersAndSubjects.Remove(deleteSub);
            TeacSubjectsList = NewTeacher.TeachersAndSubjects.ToList();
            this.RaisePropertyChanged(nameof(subjectList));
        }

        // Óäàëåíèå êóðñà èç ñïèñêà ñ äîáàâëåííûìè êóðñàìè
        public void DeleteCou(TeachersAndCourse deleteCou)
        {
            NewTeacher.TeachersAndCourses.Remove(deleteCou);
            TeacCoursesList = NewTeacher.TeachersAndCourses.ToList();
            this.RaisePropertyChanged(nameof(courseList));
        }

        public void ToMainPage()
		{
			MainWindowViewModel.Instance.Uc = new TeachersPage();
		}

        public void ToAddCoursePage()
        {
            MainWindowViewModel.Instance.Uc = new AddCourse();
        }

        public async void AddTeacher() 
        {
            ButtonResult checking = await MessageBoxManager.GetMessageBoxStandard("Ïðîâåðêà äåéñòâèÿ", "Âû õîòèòå ñîõðàíèòü äàííûå?", ButtonEnum.YesNo).ShowAsync();
            switch (checking)
            {
                case ButtonResult.Yes:
                {
                        if (NewTeacher.Teacherid == 0)
                        {
                            MainWindowViewModel.connection.Teachers.Add(NewTeacher);
                        }
                        MainWindowViewModel.connection.SaveChanges();
                        MainWindowViewModel.Instance.Uc = new TeachersPage();
                        break;
                }
                case ButtonResult.No:
                {
                       break;
                }
            }
        }
    }
}