using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.FSE.UsersAndRoles.Models
{
    public class RolesCollection : Collection<RoleModel>
    {
        private bool _invalidating;

        protected override void InsertItem(int index, RoleModel item)
        {
            base.InsertItem(index, item);
            item.PropertyChanged += Item_PropertyChanged;
            Invalidate();
        }

        private void Item_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(RoleModel.IsSelected))
            {
                Invalidate();
            }
        }

        private void Invalidate()
        {
            if (!_invalidating)
            {
                _invalidating = true;

                foreach (var role in Items)
                {
                    foreach (var dependencyRole in role.Dependencies)
                    {
                        var dependencyRoleModel = Items.SingleOrDefault(x => x.Role.Code == dependencyRole.ToInt32());

                        if (dependencyRoleModel != null)
                        {
                            if (role.IsSelected)
                            {
                                dependencyRoleModel.IsSelected = true;
                                dependencyRoleModel.IsEnabled = false;
                            }
                            else
                            {
                                dependencyRoleModel.IsEnabled = !Items.Any(x => x.IsSelected && x.Dependencies.Contains(dependencyRole));
                            }
                        }
                    }
                }

                _invalidating = false;
            }
        }
    }
}