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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core.DI;
using Tango.FSE.Common.Connection;
using Tango.FSE.Common.MachineUpdates;
using Tango.PPC.Shared.Updates;
using Tango.Transport;

namespace Tango.FSE.UI.MachineUpdates
{
    public class DefaultMachineUpdatesProvider : IMachineUpdatesProvider
    {
        private MachineUpdatesResult _lastResult;
        private IMachineProvider MachineProvider { get; set; }

        public DefaultMachineUpdatesProvider(IMachineProvider machineProvider)
        {
            MachineProvider = machineProvider;
            MachineProvider.MachineDisconnected += MachineProvider_MachineDisconnected;
        }

        private void MachineProvider_MachineDisconnected(object sender, MachineDisconnectedEventArgs e)
        {
            _lastResult = null;
        }

        public async Task<MachineUpdatesResult> GetUpdates()
        {
            if (_lastResult != null)
            {
                return _lastResult;
            }

            var response = await MachineProvider.MachineOperator.SendGenericRequest<GetUpdatesAndPackagesRequest, GetUpdatesAndPackagesResponse>(new GetUpdatesAndPackagesRequest() { }, new TransportRequestConfig()
            {
                 Timeout = TimeSpan.FromSeconds(30)
            });

            MachineUpdatesResult result = new MachineUpdatesResult();
            result.Updates = response.Updates.Select(x => x.ToObservable()).ToList();
            result.Packages = response.Packages;

            _lastResult = result;

            return result;
        }
    }
}