<% @env,@app,@role = name.sub('.json','').split('-') %>
{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "<%= @app.capitalize %> Stack",
  "Mappings": {
    "AWSInstanceType2Arch": {
      "c1.medium": {
        "Arch": "64"
      },
      "c1.xlarge": {
        "Arch": "64"
      },
      "cc1.4xlarge": {
        "Arch": "64"
      },
      "cc2.8xlarge": {
        "Arch": "64"
      },
      "cg1.4xlarge": {
        "Arch": "64"
      },
      "m1.large": {
        "Arch": "64"
      },
      "m1.medium": {
        "Arch": "64"
      },
      "m1.small": {
        "Arch": "64"
      },
      "m1.xlarge": {
        "Arch": "64"
      },
      "m2.2xlarge": {
        "Arch": "64"
      },
      "m2.4xlarge": {
        "Arch": "64"
      },
      "m2.xlarge": {
        "Arch": "64"
      },
      "t1.micro": {
        "Arch": "64"
      }
    },
    "AWSRegionArch2AMI": {
      "us-east-1": {
        "32": "",
        "64": "<%= @ami %>"
      },
      "us-west-1": {
        "32": "",
        "64": ""
      }
    }
  },
  "Outputs": {
    "ELBHostname": {
      "Description": "The URL of the website",
      "Value": {
        "Fn::Join": [
          "",
          [
            "http://",
            {
              "Fn::GetAtt": [
                "elb",
                "DNSName"
              ]
            }
          ]
        ]
      }
    }
  },
  "Parameters": {
    "Application": {
      "Default": "<%= @app %>",
      "Description": "Application name",
      "Type": "String"
    },
    "Environment": {
      "Default": "<%= @env %>",
      "Description": "stag, prod etc",
      "Type": "String"
    },
    "InstanceType": {
      "AllowedValues": [
        "t1.micro",
        "m1.small",
        "m1.medium",
        "m1.large",
        "m1.xlarge",
        "m2.xlarge",
        "m2.2xlarge",
        "m2.4xlarge",
        "c1.medium",
        "c1.xlarge",
        "cc1.4xlarge",
        "cc2.8xlarge",
        "cg1.4xlarge"
      ],
      "ConstraintDescription": "must be a valid EC2 instance type.",
      "Default": "<%= @instance_type %>",
      "Description": "WebServer EC2 instance type",
      "Type": "String"
    },
    "KeyName": {
      "Default": "default",
      "Description": "The EC2 Key Pair to allow SSH access to the instances",
      "Type": "String"
    },
    "Role": {
      "Default": "<%= @role %>",
      "Description": "redis, psql, app, etc",
      "Type": "String"
    },
    "StackNumber": {
      "Description": "s1, s2, s3, etc",
      "Type": "String"
    },
    "WebServerPort": {
      "Default": "<%= @port %>",
      "Description": "The TCP port for the Web Server",
      "Type": "Number"
    }
  },
  "Resources": {
    "CPUAlarmHigh": {
      "Properties": {
        "AlarmActions": [
          {
            "Ref": "WebServerScaleUpPolicy"
          }
        ],
        "AlarmDescription": "Scale-up if CPU > <%= @high_threshold %>% for <%= @high_mins %> minutes",
        "ComparisonOperator": "GreaterThanThreshold",
        "Dimensions": [
          {
            "Name": "AutoScalingGroupName",
            "Value": {
              "Ref": "WebServerGroup"
            }
          }
        ],
        "EvaluationPeriods": "<%= @high_periods %>",
        "MetricName": "CPUUtilization",
        "Namespace": "AWS/EC2",
        "Period": "60",
        "Statistic": "Average",
        "Threshold": "<%= @high_threshold %>"
      },
      "Type": "AWS::CloudWatch::Alarm"
    },
    "CPUAlarmLow": {
      "Properties": {
        "AlarmActions": [
          {
            "Ref": "WebServerScaleDownPolicy"
          }
        ],
        "AlarmDescription": "Scale-down if CPU < <%= @low_threshold %>% for 10 minutes",
        "ComparisonOperator": "LessThanThreshold",
        "Dimensions": [
          {
            "Name": "AutoScalingGroupName",
            "Value": {
              "Ref": "WebServerGroup"
            }
          }
        ],
        "EvaluationPeriods": "<%= @low_periods %>",
        "MetricName": "CPUUtilization",
        "Namespace": "AWS/EC2",
        "Period": "60",
        "Statistic": "Average",
        "Threshold": "<%= @low_threshold %>"
      },
      "Type": "AWS::CloudWatch::Alarm"
    },
    <%= partial("host_record.json.erb", domain: "mydomain.com") %>
    "LaunchConfig": {
      "Properties": {
        "BlockDeviceMappings": [
          {
            "DeviceName": "/dev/sdb",
            "VirtualName": "ephemeral0"
          }
        ],
        "ImageId": {
          "Fn::FindInMap": [
            "AWSRegionArch2AMI",
            {
              "Ref": "AWS::Region"
            },
            {
              "Fn::FindInMap": [
                "AWSInstanceType2Arch",
                {
                  "Ref": "InstanceType"
                },
                "Arch"
              ]
            }
          ]
        },
        "InstanceType": {
          "Ref": "InstanceType"
        },
        "KeyName": {
          "Ref": "KeyName"
        },
        "SecurityGroups": [
          "global",
          {
            "Fn::Join": [
              "-",
              [
                {
                  "Ref": "Environment"
                },
                {
                  "Ref": "Application"
                }
              ]
            ]
          },
          {
            "Ref": "ServiceSecurityGroup"
          }
        ],
        "UserData": {
          "Fn::Base64": {
            "Fn::Join": [
              "",
              [
                <% script = @user_data_script || 'app.sh.erb' %>
                <%= user_data(script) %>
              ]
            ]
          }
        }
      },
      "Type": "AWS::AutoScaling::LaunchConfiguration"
    },
    "ServiceSecurityGroup": {
      "Properties": {
        "GroupDescription": "Enable SSH access and HTTP from the load balancer only",
        "SecurityGroupIngress": [
          {
            "CidrIp": "0.0.0.0/0",
            "FromPort": "22",
            "IpProtocol": "tcp",
            "ToPort": "22"
          },
          {
            "FromPort": {
              "Ref": "WebServerPort"
            },
            "IpProtocol": "tcp",
            "SourceSecurityGroupName": {
              "Fn::GetAtt": [
                "elb",
                "SourceSecurityGroup.GroupName"
              ]
            },
            "SourceSecurityGroupOwnerId": {
              "Fn::GetAtt": [
                "elb",
                "SourceSecurityGroup.OwnerAlias"
              ]
            },
            "ToPort": {
              "Ref": "WebServerPort"
            }
          }
        ]
      },
      "Type": "AWS::EC2::SecurityGroup"
    },
    "WebServerGroup": {
      "Properties": {
        "AvailabilityZones": [
          "us-east-1a",
          "us-east-1d",
          "us-east-1e"
        ],
        "HealthCheckGracePeriod": "300",
        "HealthCheckType": "ELB",
        "LaunchConfigurationName": {
          "Ref": "LaunchConfig"
        },
        "LoadBalancerNames": [
          {
            "Ref": "elb"
          }
        ],
        "MaxSize": "<%= @max_size %>",
        "MinSize": "<%= @min_size %>",
        "NotificationConfiguration": {
          "NotificationTypes": [
            "autoscaling:EC2_INSTANCE_LAUNCH",
            "autoscaling:EC2_INSTANCE_LAUNCH_ERROR",
            "autoscaling:EC2_INSTANCE_TERMINATE",
            "autoscaling:EC2_INSTANCE_TERMINATE_ERROR"
          ],
          "TopicARN": [
            "arn:aws:sns:us-east-1:867690557112:ops"
          ]
        }
      },
      "Type": "AWS::AutoScaling::AutoScalingGroup"
    },
    "WebServerScaleDownPolicy": {
      "Properties": {
        "AdjustmentType": "ChangeInCapacity",
        "AutoScalingGroupName": {
          "Ref": "WebServerGroup"
        },
        "Cooldown": "120",
        "ScalingAdjustment": "<%= @down_adjustment %>"
      },
      "Type": "AWS::AutoScaling::ScalingPolicy"
    },
    "WebServerScaleUpPolicy": {
      "Properties": {
        "AdjustmentType": "ChangeInCapacity",
        "AutoScalingGroupName": {
          "Ref": "WebServerGroup"
        },
        "Cooldown": "120",
        "ScalingAdjustment": "<%= @up_adjustment %>"
      },
      "Type": "AWS::AutoScaling::ScalingPolicy"
    },
    "elb": {
      "Properties": {
        "AvailabilityZones": [
          "us-east-1a",
          "us-east-1d",
          "us-east-1e"
        ],
        "HealthCheck": {
          "HealthyThreshold": "3",
          "Interval": "6",
          "Target": {
            "Fn::Join": [
              "",
              [
                "HTTP:",
                {
                  "Ref": "WebServerPort"
                },
                "/up/elb"
              ]
            ]
          },
          "Timeout": "5",
          "UnhealthyThreshold": "5"
        },
        "Listeners": [
          {
            "InstancePort": {
              "Ref": "WebServerPort"
            },
            "LoadBalancerPort": "80",
            "Protocol": "HTTP"
          },
          {
            "InstancePort": {
              "Ref": "WebServerPort"
            },
            "LoadBalancerPort": "443",
            "PolicyNames": [

            ],
            "Protocol": "HTTPS",
            "SSLCertificateId": "<%= @ssl_cert %>"
          }
        ]
      },
      "Type": "AWS::ElasticLoadBalancing::LoadBalancer"
    }
  }
}