common/Ui/Common.UI/ViewModels/SIRTBroadcastersVM.cs

namespace Common.UI.ViewModels
{
    using Common.UI.Infrastructure;

    using System;
    using System.Collections.ObjectModel;
    using System.Linq;
    using System.Threading.Tasks;
    using System.Windows.Input;

    public class SIRTBroadcastersVM : VM<SIRTBroadcastersVM>
    {
        public SIRTBroadcastersVM()
        {
            this.Connections = new ObservableCollection<SIRTConnectionVM>();
            this.AddSIRTsCommand = new Command(this.AddSIRTs);

            this.AddSIRTs();
        }

        public ICommand AddSIRTsCommand { get; }

        public ObservableCollection<SIRTConnectionVM> Connections { get; }

        private void AddSIRTs()
        {
            _ = Task.Run(() =>
            {
                this.InvokeAsync(this.Connections.Clear);

                var portNames = Appsettings
                   .GetSetting("SIRTComPorts")
                   ?.Split(new[] { ';', ',', ' ' }, StringSplitOptions.RemoveEmptyEntries)
                   ?.Select(x => x?.Trim())
                   ?.ToArray() ?? new string[0];

                foreach (var portName in portNames)
                {
                    AppHost.SIRTHub.Close(portName);

                    if (AppHost.SIRTHub.TryOpen(portName, out var hexId, out var frequency))
                    {
                        this.InvokeAsync(() => this.Connections.Add(new SIRTConnectionVM(portName, hexId, frequency.ToString())));
                    }
                }
            });
        }

        protected override void ViewModel_Dispose()
        {
            var portNames = Appsettings
               .GetSetting("SIRTComPorts")
               ?.Split(new[] { ';', ',', ' ' }, StringSplitOptions.RemoveEmptyEntries)
               ?.Select(x => x?.Trim())
               ?.ToArray() ?? new string[0];

            foreach (var portName in portNames)
            {
                AppHost.SIRTHub.Close(portName);
            }
        }
    }
}