TravelAroundRussia/AvaloniaApplicationTest/ViewModels/AddPageViewModel.cs

using Avalonia.Controls.Platform;
using AvaloniaApplicationTest.Models;
using ReactiveUI;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace AvaloniaApplicationTest.ViewModels
{
    public class AddPageViewModel : ReactiveObject
    {
        bool edit = false;
        Hotel new_hotel = new Hotel();
        public AddPageViewModel()
        {

        }
        public AddPageViewModel(int ID) //я не понимаю, каким образом Авалония берет айди именно предпоследнего элемента. Именно элемента
        {
            edit = true;
            new_hotel = MainWindowViewModel.myConnection.Hotels.FirstOrDefault(x=>x.Id == ID);
            if (new_hotel != null) {
            Name = new_hotel.Name;
                Description = new_hotel.Description;
                CountOfStars = new_hotel.CountOfStars;
                ValueSelect = MainWindowViewModel.myConnection.Countries.First(x => x.Code == new_hotel.CountryCode); ;
            }
            else
            {
                Message = "Что-то пошло не так. Нажмите кнопку Отмена";
            }
        }

        public string Name
        {
            get => name;
            set => this.RaiseAndSetIfChanged(ref name, value);
        }
        public string Description
        {
            get => description;
            set => this.RaiseAndSetIfChanged(ref description, value);
        }
        public int CountOfStars
        {
            get => count_of_stars;
            set => this.RaiseAndSetIfChanged(ref count_of_stars, value);
        }

        public List<Country> CBContries
        {
            get => countries;
            set => this.RaiseAndSetIfChanged(ref countries, value);
        } 

        public Country ValueSelect
        {
            get => data;
            set
            {
                this.RaiseAndSetIfChanged(ref data, value);
            }
        }

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

        List<Country> countries = MainWindowViewModel.myConnection.Countries.ToList();

        string name = "";
        int count_of_stars = 0;
        string description = "";
        Country data = MainWindowViewModel.myConnection.Countries.First();
        string m = "";

        void GetNewData()
        {
            if (!edit) new_hotel.Id = MainWindowViewModel.myConnection.Hotels.Max(x => x.Id)+1;
            new_hotel.Name = Name;
            new_hotel.CountOfStars = CountOfStars;
            new_hotel.CountryCode =  ValueSelect.Code;
            new_hotel.Description = Description;
        }

        bool CheckData()
        {
            if ((Name == string.Empty) || (Description == string.Empty) || (ValueSelect.Name == string.Empty) || (CountOfStars < 0) || (CountOfStars > 5))
            {
                Message = "Некорректные данные. Повторите";
                return false;
            }
            return true;
        }

        public void Save()
        {
            GetNewData();
            if (CheckData())
            {
                Message = string.Empty;
                try
                {
                    if (!edit) MainWindowViewModel.myConnection.Hotels.Add(new_hotel);
                    MainWindowViewModel.myConnection.SaveChanges();
                    Message = "Сохранено. Нажмите кнопку Отмена.";
                }
                catch
                {
                    Message = "Что-то пошло не так!";
                }
            }
        }
    }
}