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 AddDiscipline : Window
{
    List<Group> _groups = new List<Group>();
    List<FormAttest> _formAttests = new List<FormAttest>();
    List<Student> _students = new List<Student>();
    Discipline _discipline = new Discipline();
    Attestation _attestation = new Attestation();
    CalculateGrade calculateGrade = new CalculateGrade();
    public AddDiscipline()
    {
        InitializeComponent();
        using var ctx = new DatabaseContext();
        
        _groups = ctx.Groups.ToList();
        _formAttests = ctx.FormAttests.ToList();
        _students = ctx.Students.ToList();
        
        ListBoxGroups.ItemsSource = _groups.Select(it => it.Id);
        FormAttestComboBox.ItemsSource = _formAttests.Select(g => g.Name).ToList();
    }

    private void ButtonAdd_OnClick(object? sender, RoutedEventArgs e)
    {
        // if (string.IsNullOrWhiteSpace(ListBoxGroups.SelectedItem.ToString()) || string.IsNullOrWhiteSpace(DisciplineNameTextBox.Text) || string.IsNullOrWhiteSpace(FormAttestComboBox.SelectedItem.ToString()))
        // {
        //     ErrorMessage.Text = "Поля не должны быть пустыми!";
        //     return;
        // }
        if (FormAttestComboBox.SelectedItem == null || 
            ListBoxGroups.SelectedItems == null || 
            ListBoxGroups.SelectedItems.Count == 0 || 
            string.IsNullOrWhiteSpace(DisciplineNameTextBox?.Text))
        {
            ErrorMessage.Text = "Поля не должны быть пустыми!";
            return;
        }
        
        var ctx = new DatabaseContext();
        
        var disciplineName = DisciplineNameTextBox.Text;
        var selectedGroupIds = ListBoxGroups.SelectedItems.Cast<int>();
        var selectedFormAttestId = ctx.FormAttests.FirstOrDefault(f => f.Name == FormAttestComboBox.SelectedItem.ToString()).Id;
        
        int lastDisciplineId = ctx.Disciplines.Max(u => u.Id);

        _discipline = new Discipline(){ Id = lastDisciplineId + 1, Name = disciplineName, IdFormAttest = selectedFormAttestId };
        ctx.Disciplines.Add(_discipline);

        foreach (var groupId in selectedGroupIds)
        {
            _students = ctx.Students.Where(s => s.IdGroup == groupId).ToList();
            foreach (var student in _students)
            {
                _attestation = new Attestation(){ IdUser = student.Id, IdDiscipline = lastDisciplineId+1, AttestFirst = 0, AttestSecond = 0, AttestThird = 0, Total = 0, Grade = calculateGrade.CalculateGradeMethod(0, selectedFormAttestId)};
                ctx.Attestations.Add(_attestation);
            }
        }
        
        var changes = ctx.SaveChanges();
        
        if (changes > 0)
        {
            SuccessMessage.Text = "дисциплина успешно добавлена!";
            if (ErrorMessage != null)
            {
                ErrorMessage.Text = "";
            }
        }
        else
        {
            ErrorMessage.Text = "Не удалось добавить дисциплину.";
            SuccessMessage.Text = "";
        }
    }
    
    private void ButtonBack_OnClick(object? sender, RoutedEventArgs e)
    {
        Close();
    }
}