using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Amazon.CloudWatch;
using Amazon.CloudWatch.Model;

namespace AWSSDKDocSamples.CloudWatch
{
  class CloudWatchSamples : ISample
  {
    public static void CWGetMetricStatistics()
    {
      #region CWGetMetricStatistics
      var client = new AmazonCloudWatchClient();

      var request = new GetMetricStatisticsRequest
      {
        Dimensions = new List<Dimension>() { dimension },
        EndTime = DateTime.Today,
        MetricName = "CPUUtilization",
        Namespace = "AWS/EC2",
        // Get statistics by day.
        Period = (int)TimeSpan.FromDays(1).TotalSeconds,
        // Get statistics for the past month.
        StartTime = DateTime.Today.Subtract(TimeSpan.FromDays(30)),
        Statistics = new List<string>() { "Minimum" },
        Unit = StandardUnit.Percent
      };

      var response = client.GetMetricStatistics(request);

      if (response.Datapoints.Count > 0)
      {
        foreach (var point in response.Datapoints)
        {
          Console.WriteLine(point.Timestamp.ToShortDateString() +
            " " + point.Minimum + "%");
        }
      }
      #endregion

      Console.ReadLine();
    }

    public static void CWPutMetricData()
    {
      #region CWPutMetricData
      var client = new AmazonCloudWatchClient();

      var dimension = new Dimension
      {
        Name = "Desktop Machine Metrics",
        Value = "Virtual Desktop Machine Usage"
      };

      var metric1 = new MetricDatum
      {
        Dimensions = new List<Dimension>() { dimension },
        MetricName = "Desktop Machines Online",
        StatisticValues = new StatisticSet(),
        Timestamp = DateTime.Today,
        Unit = StandardUnit.Count,
        Value = 14
      };

      var metric2 = new MetricDatum
      {
        Dimensions = new List<Dimension>() { dimension },
        MetricName = "Desktop Machines Offline",
        StatisticValues = new StatisticSet(),
        Timestamp = DateTime.Today,
        Unit = StandardUnit.Count,
        Value = 7
      };

      var metric3 = new MetricDatum
      {
        Dimensions = new List<Dimension>() { dimension },
        MetricName = "Desktop Machines Online",
        StatisticValues = new StatisticSet(),
        Timestamp = DateTime.Today,
        Unit = StandardUnit.Count,
        Value = 12
      };

      var metric4 = new MetricDatum
      {
        Dimensions = new List<Dimension>() { dimension },
        MetricName = "Desktop Machines Offline",
        StatisticValues = new StatisticSet(),
        Timestamp = DateTime.Today,
        Unit = StandardUnit.Count,
        Value = 9
      };

      var request = new PutMetricDataRequest
      {
        MetricData = new List<MetricDatum>() { metric1, metric2, 
          metric3, metric4 },
        Namespace = "Example.com Custom Metrics"
      };

      client.PutMetricData(request);
      #endregion
    }

    public static void CWListMetrics()
    {
      #region CWListMetrics
      var client = new AmazonCloudWatchClient();

      var filter = new DimensionFilter
      {
        Name = "InstanceType",
        Value = "t1.micro"
      };

      var request = new ListMetricsRequest
      {
        Dimensions = new List<DimensionFilter>() { filter },
        MetricName = "CPUUtilization",
        Namespace = "AWS/EC2"
      };

      var response = new ListMetricsResponse();

      do
      {
        response = client.ListMetrics(request);

        if (response.Metrics.Count > 0)
        {
          foreach (var metric in response.Metrics)
          {
            Console.WriteLine(metric.MetricName +
              " (" + metric.Namespace + ")");

            foreach (var dimension in metric.Dimensions)
            {
              Console.WriteLine("  " + dimension.Name + ": "
                + dimension.Value);
            }
          }
        }
        else
        {
          Console.WriteLine("No metrics found.");
        }

        request.NextToken = response.NextToken;

      } while (!string.IsNullOrEmpty(response.NextToken));
      #endregion

      Console.ReadLine();
    }

    public static void CWDescribeAlarms()
    {
      #region CWDescribeAlarms
      var client = new AmazonCloudWatchClient();

      var request = new DescribeAlarmsRequest
      {
        AlarmNames = new List<string>() 
          { "awseb-e-b36EXAMPLE-stack-CloudwatchAlarmLow-1KAKH4EXAMPLE" },
        MaxRecords = 1,
        StateValue = StateValue.ALARM
      };

      var response = new DescribeAlarmsResponse();

      do
      {
        response = client.DescribeAlarms(request);

        foreach (var alarm in response.MetricAlarms)
        {
          Console.WriteLine(alarm.AlarmName);
          Console.WriteLine(alarm.AlarmDescription);
          Console.WriteLine(alarm.MetricName + " " +
              alarm.ComparisonOperator + " " + alarm.Threshold);
          Console.WriteLine();
        }

        request.NextToken = response.NextToken;

      } while (!string.IsNullOrEmpty(response.NextToken));
      #endregion

      Console.ReadLine();
    }

    public static void CWDescribeAlarmHistory()
    {
      #region CWDescribeAlarmHistory
      var client = new AmazonCloudWatchClient();

      var request = new DescribeAlarmHistoryRequest
      {
        AlarmName =
          "awseb-e-kkbEXAMPLE-stack-CloudwatchAlarmLow-1WVXD9EXAMPLE",
        EndDate = DateTime.Today,
        HistoryItemType = HistoryItemType.Action,
        MaxRecords = 1,
        StartDate = DateTime.Today.Subtract(TimeSpan.FromDays(30))
      };

      var response = new DescribeAlarmHistoryResponse();

      do
      {
        response = client.DescribeAlarmHistory(request);

        foreach (var item in response.AlarmHistoryItems)
        {
          Console.WriteLine(item.AlarmName);
          Console.WriteLine(item.HistorySummary);
          Console.WriteLine();
        }

        request.NextToken = response.NextToken;

      } while (!string.IsNullOrEmpty(response.NextToken));
      #endregion

      Console.ReadLine();
    }

    public static void CWPutMetricAlarm()
    {
      #region CWPutMetricAlarm
      var client = new AmazonCloudWatchClient();

      var dimension = new Dimension
      {
        Name = "Desktop Machine Metrics",
        Value = "Virtual Desktop Machine Usage"
      };

      var request = new PutMetricAlarmRequest
      {
        ActionsEnabled = true,
        AlarmActions = new List<string>() 
          { "arn:aws:sns:us-east-1:80398EXAMPLE:CodingTestResults" },
        AlarmDescription = "Too many instances offline",
        AlarmName = "Offline Instances",
        ComparisonOperator = ComparisonOperator.GreaterThanOrEqualToThreshold,
        Dimensions = new List<Dimension>() { dimension },
        EvaluationPeriods = 1,
        MetricName = "Desktop Machines Offline",
        Namespace = "Example.com Custom Metrics",
        Period = (int)TimeSpan.FromMinutes(5).TotalSeconds,
        Statistic = new Statistic("Maximum"),
        Threshold = 5,
        Unit = StandardUnit.Count
      };

      client.PutMetricAlarm(request);
      #endregion
    }

    public static void CWDescribeAlarmsForMetric()
    {
      #region CWDescribeAlarmsForMetric
      var client = new AmazonCloudWatchClient();

      var dimension = new Dimension
      {
        Name = "AutoScalingGroupName",
        Value = "awseb-e-kkbEXAMPLE-stack-AutoScalingGroup-F4TAUEXAMPLE"
      };

      var request = new DescribeAlarmsForMetricRequest
      {
        Dimensions = new List<Dimension>() { dimension },
        MetricName = "NetworkOut",
        Namespace = "AWS/EC2"
      };

      var response = client.DescribeAlarmsForMetric(request);

      if (response.MetricAlarms.Count > 0)
      {
        foreach (var alarm in response.MetricAlarms)
        {
          Console.WriteLine();
          Console.WriteLine(alarm.AlarmName);
          Console.WriteLine(alarm.AlarmDescription);
          Console.WriteLine(alarm.MetricName + " " +
            alarm.ComparisonOperator + " " + alarm.Threshold);
        }
      }
      else
      {
        Console.WriteLine("No alarms.");
      }
      #endregion

      Console.ReadLine();
    }

    public static void CWDeleteAlarms()
    {
      #region CWDeleteAlarms
      var client = new AmazonCloudWatchClient();

      var request = new DeleteAlarmsRequest
      {
        AlarmNames = new List<string>() { "t1.microCPUUtilization" }
      };

      client.DeleteAlarms(request);
      #endregion
    }

    public static void CWSetAlarmState()
    {
      #region CWSetAlarmState
      var client = new AmazonCloudWatchClient();

      var request = new SetAlarmStateRequest
      {
        AlarmName = "Offline Instances",
        StateReason = "Too many instances are offline.",
        StateValue = StateValue.ALARM
      };

      client.SetAlarmState(request);
      #endregion
    }

    public static void CWEnableAlarmActions()
    {
      #region CWEnableAlarmActions
      var client = new AmazonCloudWatchClient();

      var request = new EnableAlarmActionsRequest
      {
        AlarmNames = new List<string>() 
          { "awseb-e-kkbEXAMPLE-stack-CloudwatchAlarmLow-1WVXD9EXAMPLE" }
      };

      client.EnableAlarmActions(request);
      #endregion
    }

    public static void CWDisableAlarmActions()
    {
      #region CWDisableAlarmActions
      var client = new AmazonCloudWatchClient();

      var request = new DisableAlarmActionsRequest
      {
        AlarmNames = new List<string>() 
          { "awseb-e-kkbEXAMPLE-stack-CloudwatchAlarmLow-1WVXD9EXAMPLE" }
      };

      client.DisableAlarmActions(request);
      #endregion
    }
    
    #region ISample Members
    public virtual void Run()
    {

    }
    #endregion
  }
}