#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.Net;
using System.Threading;
using HeuristicLab.Clients.Hive.SlaveCore;
using Microsoft.WindowsAzure.Diagnostics;
using Microsoft.WindowsAzure.ServiceRuntime;
using Microsoft.WindowsAzure;
using Microsoft.WindowsAzure.StorageClient;
using System.Text;

namespace HeuristicLab.Clients.Hive.Slave.AzureClient {


  public class WorkerRole : RoleEntryPoint {
    private Core core;
    private Thread coreThread;

    private const string HiveServerAddressSetting = "HiveServerAddress";
    private const string HiveServerCertificateSetting = "HiveServerCertifcateEncodedValue";

    public override void Run() {
      try {
        LogError(new Exception("Starting Run()..."));
        core = new Core(false);

        string hiveServerAddress = RoleEnvironment.GetConfigurationSettingValue(HiveServerAddressSetting);
        string hiveServerCertificate = RoleEnvironment.GetConfigurationSettingValue(HiveServerCertificateSetting);

        // values are empty, settings from app.config are used
        if (!string.IsNullOrEmpty(hiveServerAddress) && !string.IsNullOrEmpty(hiveServerCertificate)) {
          core.SetNewHiveServer(hiveServerAddress, hiveServerCertificate);
        }

        coreThread = new Thread(core.Start);
        coreThread.Start();

        LogError(new Exception("Run(): Core started successfullly"));
        while (true) {
          Thread.Sleep(10000);
        }
      }
      catch (Exception e) {
        LogError(e);
		throw e;
      }
    }

    public override bool OnStart() {
      try {
        ServicePointManager.DefaultConnectionLimit = 12;
        //core = new Core();
        LogError(new Exception("Running OnStart()"));
        try {
          if (!String.IsNullOrEmpty(RoleEnvironment.GetConfigurationSettingValue(Constants.DiagnosticsConnectionString))) {
            DiagnosticMonitorConfiguration dmc = DiagnosticMonitor.GetDefaultInitialConfiguration();
            dmc.Logs.ScheduledTransferPeriod = TimeSpan.FromSeconds(5);
            dmc.Logs.ScheduledTransferLogLevelFilter = LogLevel.Verbose;
            DiagnosticMonitor.Start(Constants.DiagnosticsConnectionString, dmc);
          }
        }
        catch (RoleEnvironmentException ex) {
          // diagnostics connection string not in configuration
          // -> diagnostics disabled
          // nothing more to do
          LogError(ex);
        }

        RoleEnvironment.Changed += RoleEnvironmentChanged;
        LogError(new Exception("Finished OnStart() successfullly"));
      }
      catch (Exception ex) {
        LogError(ex);
		throw ex;
      }
      return base.OnStart();
    }

    private void LogError(Exception e) {
      var storageAccount = CloudStorageAccount.Parse(RoleEnvironment.GetConfigurationSettingValue(Constants.DiagnosticsConnectionString));
      var blobClient = storageAccount.CreateCloudBlobClient();
      var container = blobClient.GetContainerReference("slavelog");
      container.CreateIfNotExist();
      var guid = Guid.NewGuid();
      var blob = container.GetBlobReference(guid.ToString());
      var builder = new StringBuilder();
      builder.Append("ToString: ").Append(e.ToString()).Append("\n");
      builder.Append("Message: ").Append(e.Message).Append("\n");
      blob.UploadText(builder.ToString());
    }

    public override void OnStop() {
      core.Shutdown();
      base.OnStop();
    }

    private void RoleEnvironmentChanged(object sender, RoleEnvironmentChangedEventArgs e) {
    }
  }
}