using System.Collections.Generic;
using System.Linq;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using kursovaya.Models;

namespace kursovaya;

public partial class AddTeacher : Window
{
    List<DisciplinePresenter> _disciplinePresenters = new List<DisciplinePresenter>();
    Teacher _teacher = new Teacher();
    List<Teacher> _teachers = new List<Teacher>();
    
    public AddTeacher()
    {
        InitializeComponent();
        using var ctx = new DatabaseContext();
        
        var disciplineTeachers = ctx.DisciplineTeachers.ToList();
        _disciplinePresenters = ctx.Disciplines.Select(it => new DisciplinePresenter()
        {
            Discipline = it,
        }).ToList();
        
        ListBoxDisciplineGroup.ItemsSource = _disciplinePresenters;
    }

    private void ButtonAdd_OnClick(object? sender, RoutedEventArgs e)
    {
        if (ListBoxDisciplineGroup.SelectedItems == null || 
            ListBoxDisciplineGroup.SelectedItems.Count == 0 || 
            string.IsNullOrWhiteSpace(TeacherNameTextBox?.Text))
        {
            ErrorMessage.Text = "Поля не должны быть пустыми!";
            return;
        }
        
        var ctx = new DatabaseContext();
        
        var teacherName = TeacherNameTextBox.Text;
        var selectedItems = ListBoxDisciplineGroup.SelectedItems.Cast<DisciplinePresenter>().ToList();
        int lastUserId = ctx.Users.Max(u => u.Id);
        int lastTeacherId = ctx.Teachers.Max(u => u.Id);
        
        var user = new User(){ Id = lastUserId + 1, Login = $"user{lastUserId+1}", Password = "qwerty", Email = $"user{lastUserId+1}@mail.ru", RoleId = 2};
        ctx.Users.Add(user);
        
        _teacher = new Teacher(){Id = lastTeacherId+1, Fio = teacherName, Login = $"user{lastUserId+1}"};
        _teachers.Add(_teacher);
        ctx.Teachers.Add(_teacher);
        
        foreach (var item in selectedItems)
        {
            var disc_teach = new DisciplineTeacher() { IdDiscipline = item.Discipline.Id, IdTeacher = lastTeacherId+1 };
            ctx.DisciplineTeachers.Add(disc_teach);
        }
        
        var changes = ctx.SaveChanges();
        
        if (changes > 0)
        {
            SuccessMessage.Text = "Учитель успешно добавлен!";
            if (ErrorMessage != null)
            {
                ErrorMessage.Text = "";
            }
        }
        else
        {
            ErrorMessage.Text = "Не удалось добавить учителя.";
            SuccessMessage.Text = "";
        }
    }
    
    private void ButtonBack_OnClick(object? sender, RoutedEventArgs e)
    {
        Close(_teachers);
    }
    
    public class DisciplinePresenter()
    {
        public Discipline Discipline { get; set; }
        public string DisciplineName
        {
            get => Discipline.Name;
        }
    }
}