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.Deployment;
using Tango.AzureUtils.Environment;
using Tango.Core.Commands;
using Tango.SharedUI;

namespace Tango.AzureUtils.UI.ViewModels
{
    public class EnvironmentUpgradeViewVM : AzureDashboardViewModel
    {
        private List<IWebAppBase> _apps;
        public List<IWebAppBase> Apps
        {
            get { return _apps; }
            set { _apps = value; RaisePropertyChangedAuto(); }
        }

        private IWebAppBase _selectedSourceApp;
        public IWebAppBase SelectedSourceApp
        {
            get { return _selectedSourceApp; }
            set { _selectedSourceApp = value; RaisePropertyChangedAuto(); }
        }

        private IWebAppBase _selectedTargetAPp;
        public IWebAppBase SelectedTargetApp
        {
            get { return _selectedTargetAPp; }
            set { _selectedTargetAPp = value; RaisePropertyChangedAuto(); }
        }

        private EnvironmentManager _environmentManager;
        public EnvironmentManager EnvironmentManager
        {
            get { return _environmentManager; }
            set { _environmentManager = value; RaisePropertyChangedAuto(); }
        }

        private bool _canUpgrade;
        public bool CanUpgrade
        {
            get { return _canUpgrade; }
            set { _canUpgrade = value; RaisePropertyChangedAuto(); }
        }

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


        public RelayCommand ValidateUpgradeCommand { get; set; }

        public RelayCommand UpgradeEnvironmentCommand { get; set; }

        public EnvironmentUpgradeViewVM()
        {
            Config = new UpgradeEnvironmentConfiguration();
            ValidateUpgradeCommand = new RelayCommand(() => ValidateUpgrade());
            UpgradeEnvironmentCommand = new RelayCommand(() => UpgradeEnvironment());
        }

        public override void OnAuthenticated(IAzure azure, List<IWebAppBase> apps)
        {
            Apps = apps;

            SelectedSourceApp = Apps.FirstOrDefault();
            SelectedTargetApp = Apps.FirstOrDefault();

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

        private async void ValidateUpgrade()
        {
            if (SelectedSourceApp == null || SelectedTargetApp == null)
            {
                return;
            }

            try
            {
                IsFree = false;
                StatusManager.UpdateStatus(AzureUtilsStage.Validating, "Validating configuration...", true);
                await EnvironmentManager.ValidateEnvironmentUpgrade(SelectedSourceApp, SelectedTargetApp, Config);
                CanUpgrade = true;
                StatusManager.UpdateStatus(AzureUtilsStage.Ready, "Configuration validated successfully.");
            }
            catch (Exception ex)
            {
                CanUpgrade = false;
                StatusManager.UpdateStatus(ex);
            }
            finally
            {
                IsFree = true;
            }
        }

        private async void UpgradeEnvironment()
        {
            try
            {
                IsFree = false;
                await EnvironmentManager.UpgradeEnvironment(SelectedSourceApp, SelectedTargetApp, Config);
            }
            catch (Exception ex)
            {
                StatusManager.UpdateStatus(ex);
            }
            finally
            {
                RequireRefresh();
                IsFree = true;
            }
        }

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

            var oldSource = SelectedSourceApp;
            var oldTarget = SelectedTargetApp;
            SelectedSourceApp = null;
            SelectedTargetApp = null;
            SelectedSourceApp = oldSource;
            SelectedTargetApp = oldTarget;
        }
    }
}