using System;
using System.Diagnostics;
using System.Timers;
using System.Windows.Forms;
using HeuristicLab.Clients.Hive.CloudManager.Model;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;

namespace HeuristicLab.Clients.Hive.CloudManager.Views {
  [View("Cloud Resources View")]
  [Content(typeof(IItemList<Subscription>), IsDefaultView = true)]
  public partial class CloudResourcesView : ItemView, IDisposable {
    private System.Timers.Timer timer = new System.Timers.Timer();
    private int updateInterval = 15000;
    private DateTime dueTime;

    private const int subscriptionImageIndex = 0;
    private const int serviceImageIndex = 1;
    private const int deploymentImageIndex = 2;

    public new IItemList<Subscription> Content {
      get { return (IItemList<Subscription>)base.Content; }
      set { base.Content = value; }
    }

    private IItemList<HostedService> hostedServices;
    public IItemList<HostedService> HostedServices {
      get { return hostedServices; }
      set { hostedServices = value; }
    }

    public CloudResourcesView() {
      InitializeComponent();

      treeCloudResources.ImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.NewFolder);
      treeCloudResources.ImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.NetworkCenterLarge);
      treeCloudResources.ImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.MonitorLarge);

      HostedServices = CloudManagerClient.Instance.HostedServices;
      Content = CloudManagerClient.Instance.Subscriptions;


      CloudManagerClient.Instance.Refreshing += new EventHandler(Instance_Refreshing);
      CloudManagerClient.Instance.Refreshed += new EventHandler(Instance_Refreshed);

      timer.AutoReset = true;
      timer.Interval = 1000;
      timer.Elapsed += PerformUpdate;
      timer.Start();
      dueTime = DateTime.Now.AddMilliseconds(updateInterval);
    }

    #region Register Content Events
    protected override void DeregisterContentEvents() {
      Content.ItemsAdded -= new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsAdded);
      Content.ItemsRemoved -= new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsRemoved);
      base.DeregisterContentEvents();
    }
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ItemsAdded += new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsAdded);
      Content.ItemsRemoved += new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsRemoved);
    }
    #endregion

    /// <summary> 
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing) {
      if (disposing && (components != null)) {
        components.Dispose();
        CloudManagerClient.Instance.Refreshing -= new EventHandler(Instance_Refreshing);
        CloudManagerClient.Instance.Refreshed -= new EventHandler(Instance_Refreshed);
        timer.Stop();
        timer.Dispose();
        timer = null;
      }
      base.Dispose(disposing);
    }

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      if (Content == null || Content.Count == 0) {
        btnAddSlaveService.Enabled = false;
        btnDelete.Enabled = false;
        btnSave.Enabled = false;
      } else {
        btnAddSlaveService.Enabled = true;
        btnDelete.Enabled = true;
        btnSave.Enabled = true;
      }
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      SetEnabledStateOfControls();
      if (Content == null) {
        viewHost.Content = null;
        treeCloudResources.Nodes.Clear();
      } else {
        treeCloudResources.BeginUpdate();
        treeCloudResources.Nodes.Clear();
        foreach (Subscription sub in Content) {
          TreeNode nodeSub = new TreeNode();
          nodeSub.Tag = sub;
          nodeSub.Text = sub.SubscriptionName;
          nodeSub.ImageIndex = subscriptionImageIndex;
          nodeSub.SelectedImageIndex = nodeSub.ImageIndex;

          foreach (HostedService s in HostedServices) {
            if (s.Subscription.SubscriptionID == sub.SubscriptionID) {
              TreeNode nodeServ = new TreeNode();
              nodeServ.Tag = s;
              nodeServ.Text = s.HostedServiceProperties.Label;
              nodeServ.ImageIndex = serviceImageIndex;
              nodeServ.SelectedImageIndex = nodeServ.ImageIndex;

              foreach (Deployment d in s.Deployments) {
                TreeNode nodeDepl = new TreeNode();
                nodeDepl.Tag = d;
                nodeDepl.Text = d.Label + " (" + d.DeploymentSlot + ")";
                nodeDepl.ImageIndex = deploymentImageIndex;
                nodeDepl.SelectedImageIndex = nodeDepl.ImageIndex;
                nodeServ.Nodes.Add(nodeDepl);
              }
              nodeSub.Nodes.Add(nodeServ);
            }
          }
          treeCloudResources.Nodes.Add(nodeSub);
        }
        treeCloudResources.EndUpdate();
      }
    }

    private void Instance_Refreshing(object sender, EventArgs e) {
      Debug.WriteLine("Instance_Refreshing");
      //if (treeCloudResources.InvokeRequired) {
      //  treeCloudResources.Invoke((MethodInvoker)delegate { OnContentChanged(); });
      //} else {
      //  OnContentChanged();
      //}
    }

    private void Instance_Refreshed(object sender, EventArgs e) {
      Debug.WriteLine("Instance_Refreshed");
      if (treeCloudResources.InvokeRequired) {
        treeCloudResources.Invoke((MethodInvoker)delegate { OnContentChanged(); });
      } else {
        OnContentChanged();
      }
    }

    private void Content_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<Collections.IndexedItem<Subscription>> e) {
      OnContentChanged();
    }

    private void Content_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<Collections.IndexedItem<Subscription>> e) {
      OnContentChanged();
    }

    private void PerformUpdate(object sender, ElapsedEventArgs e) {
      TimeSpan timeToRefresh = dueTime - DateTime.Now;

      if (timeToRefresh.Seconds >= 0) {
        this.Invoke((MethodInvoker)delegate { lblRefresh.Text = "Done. " + timeToRefresh.Seconds + "s to next refresh."; });
      } else {
        timer.Stop();
        this.Invoke((MethodInvoker)delegate { lblRefresh.Text = "Refreshing data ..."; });

        // statistics
        Debug.WriteLine("perform update");
        CloudManagerClient.Instance.Refresh();

        dueTime = DateTime.Now.AddMilliseconds(updateInterval);
        if (timer != null) {
          timer.Start();
        }
      }
    }

    private void btnAddSubscription_Click(object sender, EventArgs e) {
      using (var form = new AddSubscriptionDialog()) {
        form.ShowDialog();
        if (!form.ErrorOccured) {
          if (form.Subscription != null) {
            Subscription sub = form.Subscription;
            CloudManagerClient.Instance.Add(sub);
          }
        }
      }
    }

    private void btnAddSlaveService_Click(object sender, EventArgs e) {
      // When refreshing subscriptions in the dialog, 
      // discoverservices and safetoconfig properties are always set to false
      // -> work on deep copy
      Cloner cloner = new Cloner();
      IItemList<Subscription> subscriptions = cloner.Clone(Content);
      using (var form = new AddAzureServiceDialog(subscriptions)) {
        form.ShowDialog();

      }
    }

    private void treeCloudResources_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) {
      viewHost.Content = (IContent)e.Node.Tag;
    }
  }
}