using System;
using System.Collections.ObjectModel;
using System.Windows;
using Telerik.Windows.Controls;

namespace WpfApp76
{
    public partial class MainWindow : Window
    {
        private const int MAX_MESSAGE_COUNT = 2;

        private RadDesktopAlertManager manager = new RadDesktopAlertManager();

        private readonly List<RadDesktopAlert> m_alertsCollection;

        public MainWindow()
        {
            InitializeComponent();

            m_alertsCollection = new List<RadDesktopAlert>();
        }

        private void RadButton_Click(object sender, RoutedEventArgs e)
        {
            AddAlert("a");
            RemoveAlert("a");
            AddAlert("b");
            RemoveAlert("b");
            AddAlert("c");
        }

        private void AddAlert(string alertId)
        {
            var alert = new RadDesktopAlert { Header = alertId };
            alert.Closed += Alert_Closed;

            m_alertsCollection.Add(alert);

            if (m_alertManager.GetAllAlerts().Count() < MAX_MESSAGE_COUNT)
            {
                m_alertManager.ShowAlert(alert);
            }
        }

        private void RemoveAlert(string alertId)
        {
            var alert = m_alertsCollection.SingleOrDefault(a => a.Header.ToString() == alertId);

            if (alert != null)
            {
                m_alertManager.CloseAlert(alert);
                m_alertsCollection.Remove(alert);
            }
        }

        private void Alert_Closed(object sender, Telerik.Windows.RadRoutedEventArgs e)
        {
            var closedAlert = (RadDesktopAlert)sender;
            closedAlert.Closed -= Alert_Closed;
            m_alertsCollection.Remove(closedAlert);

            // Try add next alert
            var nextAlert = m_alertsCollection.FirstOrDefault();
            if (nextAlert != null)
            {
                m_alertManager.ShowAlert(nextAlert);
            }
        }
    }
}