#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using HeuristicLab.Clients.Hive.CloudManager.Azure;
using HeuristicLab.Clients.Hive.CloudManager.Model;
using HeuristicLab.Clients.Hive.CloudManager.Properties;
using HeuristicLab.Common;
using HeuristicLab.Core;

namespace HeuristicLab.Clients.Hive.CloudManager {
  [Item("CloudManagerClient", "Hive Cloud Manager Client.")]
  public sealed class CloudManagerClient : IContent {
    private static CloudManagerClient instance;
    public static CloudManagerClient Instance {
      get {
        if (instance == null) instance = new CloudManagerClient();
        return instance;
      }
    }

    private CloudManagerClient() {
      subscriptions = new ItemList<Subscription>();
      hostedServices = new ItemList<HostedService>();
      azureProvider = new AzureProvider();
    }

    #region Properties
    private IItemList<Subscription> subscriptions;
    public IItemList<Subscription> Subscriptions {
      get { return subscriptions; }
      set {
        if (value != subscriptions) {
          subscriptions = value;
          //fire event OnSubscriptionsChagned
        }
      }
    }

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

    private IAzureProvider azureProvider;
    public IAzureProvider AzureProvider {
      get { return azureProvider; }
      set { azureProvider = value; }
    }

    #endregion

    #region Events

    public event EventHandler Refreshing;
    private void OnRefreshing() {
      EventHandler handler = Refreshing;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Refreshed;
    private void OnRefreshed() {
      var handler = Refreshed;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    #endregion

    #region Refresh

    public void Refresh() {
      OnRefreshing();

      try {
        IItemList<Subscription> subs = new ItemList<Subscription>(Subscriptions);
        foreach (Subscription subscription in subs) {
          if (subscription.DiscoverServices) {
            List<HostedService> servs = AzureProvider.DiscoverSlaveService(subscription);
            foreach (HostedService s in servs) {
              Add(s);
            }

            List<HostedService> listToDelete = new List<HostedService>();
            foreach (HostedService s in HostedServices) {
              if (!servs.Contains(s)) {
                //Remove(s);
                listToDelete.Add(s);
              }
            }
            foreach (HostedService s in listToDelete) {
              Remove(s);
            }
          }
        }
      }
      catch {
        throw;
      }
      finally {
        OnRefreshed();
      }
    }

    #endregion

    public void Add(Subscription subscription) {
      if (subscription == null) {
        throw new ArgumentNullException("subscription", "Subscription must not be null.");
      }
      if (Subscriptions.Contains(subscription)) {
        Subscriptions.Remove(subscription);
      }
      Subscriptions.Add(subscription);
    }

    public void Remove(Subscription subscription) {
      if (subscription == null) {
        throw new ArgumentNullException("subscription", "Subscription must not be null.");
      }
      if (Subscriptions.Contains(subscription)) {
        Subscriptions.Remove(subscription);
      }
    }

    public void Remove(HostedService hostedService) {
      if (hostedService == null) {
        throw new ArgumentNullException("hostedService", "HostedService must not be null.");
      }
      if (HostedServices.Contains(hostedService)) {
        HostedServices.Remove(hostedService);
      }
    }

    public void Add(HostedService hostedService) {
      if (hostedService == null) {
        throw new ArgumentNullException("subscription", "Subscription must not be null.");
      }
      if (HostedServices.Contains(hostedService)) {
        //HostedServices.Remove(hostedService);
        HostedService hs = HostedServices[HostedServices.IndexOf(hostedService)];
        hs.Merge(hostedService);

      } else {
        HostedServices.Add(hostedService);
      }
    }

    public void ChangeIntances(Deployment deployment, HostedService hostedService) {
      if (deployment == null) {
        throw new ArgumentNullException("Deployment", "Deployment must not be null.");
      }
      if (hostedService == null) {
        throw new ArgumentNullException("HostedService", "HostedService must not be null.");
      }
      if (deployment.Modified) {
        AzureProvider.ChangeInstanceCount(deployment.Subscription,
                                          hostedService.ServiceName,
                                          deployment.DeploymentSlot,
                                          HeuristicLab.Clients.Hive.CloudManager.Azure.Constants.DeploymentRoleName,
                                          deployment.NewInstanceCount);
        deployment.Modified = false;
      }
    }

    public void Delete(Deployment deployment, HostedService hostedService) {
      if (deployment == null) {
        throw new ArgumentNullException("Deployment", "Deployment must not be null.");
      }
      if (hostedService == null) {
        throw new ArgumentNullException("HostedService", "HostedService must not be null.");
      }
      //AzureProvider.DeleteDeployment();
    }

    public void Delete(HostedService hostedService) {
      if (hostedService == null) {
        throw new ArgumentNullException("HostedService", "HostedService must not be null.");
      }
      AzureProvider.DeleteHostedService(hostedService.Subscription, hostedService.ServiceName);
    }

    public void Delete(Subscription subscription) {
      if (subscription == null) {
        throw new ArgumentNullException("subscription", "Subscription must not be null.");
      }
      if (Subscriptions.Contains(subscription)) {
        Subscriptions.Remove(subscription);
      }
    }

    public void PersistSubscriptionsToUserConfig() {
      Settings.Default.Upgrade();
      StringCollection strCol = Settings.Default.AzureSubscriptions;
      strCol.Clear();
      foreach (Subscription sub in Subscriptions) {
        if (sub.SaveToConfig) {
          string setting = sub.GetSettingString();
          setting = CryptoService.EncryptString(CryptoService.ToSecureString(setting));
          strCol.Add(setting);
        }
      }
      Settings.Default.Save();
    }

    public List<Subscription> RestoreSubscriptionsFromUserConfig() {
      List<Subscription> result = new List<Subscription>();
      StringCollection strCol = Settings.Default.AzureSubscriptions;
      foreach (string azureSub in strCol) {
        string setting = CryptoService.ToInsecureString(CryptoService.DecryptString(azureSub));
        Subscription tmp = Subscription.ParseSettingString(setting);
        Subscription s = CloudManagerClient.Instance.AzureProvider.GetSubscriptionInfo(tmp.SubscriptionID, tmp.CertificateThumbprint);
        s.SaveToConfig = true;
        s.DiscoverServices = true;
        result.Add(s);
      }
      return result;
    }
  }
}