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using Microsoft.Azure.Management.AppService.Fluent;
using Microsoft.Azure.Management.Fluent;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.AzureUtils.Environment;
using Tango.Core.Commands;

namespace Tango.AzureUtils.UI.ViewModels
{
    public class EnvironmentRollbackViewVM : AzureDashboardViewModel
    {
        private IWebAppBase _machineServiceApp;
        private EnvironmentManager _environmentManager;

        private List<IDeploymentSlot> _deploymentSlots;
        public List<IDeploymentSlot> DeploymentSlots
        {
            get { return _deploymentSlots; }
            set { _deploymentSlots = value; RaisePropertyChangedAuto(); }
        }

        private IDeploymentSlot _selectedDeploymentSlot;
        public IDeploymentSlot SelectedDeploymentSlot
        {
            get { return _selectedDeploymentSlot; }
            set { _selectedDeploymentSlot = value; RaisePropertyChangedAuto(); }
        }

        private RollbackEnvironmentConfiguration _config;
        public RollbackEnvironmentConfiguration Config
        {
            get { return _config; }
            set { _config = value; RaisePropertyChangedAuto(); }
        }

        public RelayCommand RollbackEnvironmentCommand { get; set; }

        public EnvironmentRollbackViewVM()
        {
            RollbackEnvironmentCommand = new RelayCommand(RollbackEnvironment);
            Config = new RollbackEnvironmentConfiguration();
        }

        public override void OnAuthenticated(IAzure azure, List<IWebAppBase> apps)
        {
            _machineServiceApp = apps.SingleOrDefault(x => x.Name == "MachineService");
            DeploymentSlots = apps.OfType<IDeploymentSlot>().Where(x => x.Parent == _machineServiceApp).ToList();
            SelectedDeploymentSlot = DeploymentSlots.FirstOrDefault();

            _environmentManager = new EnvironmentManager(azure);
            _environmentManager.ConfirmationRequired += ConfirmationHandler;
            _environmentManager.Progress += ProgressHandler;
        }

        private async void RollbackEnvironment()
        {
            try
            {
                IsFree = false;

                await _environmentManager.RollbackEnvironment(SelectedDeploymentSlot, Config);
            }
            catch (Exception ex)
            {
                StatusManager.UpdateStatus(ex);
            }
            finally
            {
                RequireRefresh();
                IsFree = true;
            }
        }

        protected override void OnRefreshRequired()
        {
            base.OnRefreshRequired();

            var old = SelectedDeploymentSlot;
            SelectedDeploymentSlot = null;
            SelectedDeploymentSlot = old;
        }
    }
}