using HMI.Core.Entity;
using System.Linq;
using System.Windows;

namespace HMI.Core.DpUtil
{
    public class PermissionHelper
    {
        public static string GetRequiredPermission(UIElement element)
        {
            return (string)element.GetValue(RequiredPermissionProperty);
        }

        public static void SetRequiredPermission(UIElement element, string requiredPermission)
        {
            element.SetValue(RequiredPermissionProperty, requiredPermission);
        }

        public static readonly DependencyProperty RequiredPermissionProperty =
            DependencyProperty.RegisterAttached("RequiredPermission", typeof(string), typeof(UIElement),
            new PropertyMetadata(string.Empty, OnRequiredPermissionChanged));

        private static void OnRequiredPermissionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (d is UIElement element)
            {
                if (e.Property == RequiredPermissionProperty)
                {
                    var requiredPermission = (string)e.NewValue;
                    if (string.IsNullOrEmpty(requiredPermission)) return;
                    if (UserInfo.User == null)
                    {
                        element.Visibility = Visibility.Collapsed; 
                        return;
                    }
                    if (UserInfo.User?.AllPermissions == null)
                    {
                        element.Visibility = Visibility.Collapsed;
                        return;
                    }
                    if (UserInfo.User.AllPermissions.FirstOrDefault(p => p.Code == requiredPermission) != null) return;
                    element.Visibility = Visibility.Collapsed;
                }
            }
        }
    }
}