const fn = new aws_lambda.Function(this, 'LambdaCloudWatchAlarmDemo', {
  runtime: aws_lambda.Runtime.PYTHON_3_8,
  handler: 'index.handler',
  timeout: Duration.seconds(90),
  code: aws_lambda.Code.fromAsset(path.join(__dirname, 'lambda'))
})

const alarm = new aws_cloudwatch.Alarm(this, 'LambdaInvocationAlarmDemo', {
  metric: fn.metricInvocations({
    statistic: 'sum',
    period: Duration.minutes(5)
  }),
  threshold: 5,
  evaluationPeriods: 1
})

alarm.addAlarmAction(
  new aws_cloudwatch_actions.SnsAction(
    aws_sns.Topic.fromTopicArn(
      this,
      'CodePipelineNotification',
      'arn:aws:sns:ap-southeast-1:392194582387:MonitorEc2'
    )
  )
)

// dashboard for the lambda
const dashboard = new aws_cloudwatch.Dashboard(this, 'dashboardDemo', {
  dashboardName: 'dashboardLambdaDemo'
})

// create title for dashboard
dashboard.addWidgets(
  new aws_cloudwatch.TextWidget({
    markdown: `# Dashboard: ${fn.functionName}`,
    height: 1,
    width: 24
  })
)

// add dashboard widgets
dashboard.addWidgets(
  new aws_cloudwatch.GraphWidget({
    title: 'Invocation',
    left: [
      fn.metricInvocations({
        statistic: 'sum',
        period: Duration.minutes(1)
      })
    ],
    width: 24
  })
)

// add dashboard widgets
dashboard.addWidgets(
  new aws_cloudwatch.GraphWidget({
    title: 'Duration',
    left: [fn.metricDuration()],
    width: 24
  })
)

const alarm = new aws_cloudwatch.Alarm(this, 'CwDemoMonitorPubEc2', {
  alarmName: 'MonitorPubEc2CwDemo',
  comparisonOperator: aws_cloudwatch.ComparisonOperator.LESS_THAN_THRESHOLD,
  threshold: 0.99,
  evaluationPeriods: 6,
  datapointsToAlarm: 5,
  metric: new aws_cloudwatch.Metric({
    namespace: 'AWS/EC2',
    metricName: 'CPUUtilization',
    statistic: 'Average',
    period: Duration.minutes(5),
    dimensionsMap: {
      InstanceId: ec2.instanceId
    }
  })
})

alarm.addAlarmAction(
  new aws_cloudwatch_actions.Ec2Action(
    aws_cloudwatch_actions.Ec2InstanceAction.STOP
  )
)