AWSTemplateFormatVersion: "2010-09-09"
Description: "Template description"

Parameters:
  AppEnvironment:
    Type: String
    Default: production
  EC2InstanceType: 
    Type: String
    Default: a1.medium
  AccountVpc:
    Type: AWS::EC2::VPC::Id
    Description: Account VPC
    Default: vpc-id
  EC2Subnet:
    Type: AWS::EC2::Subnet::Id
    Description: Subnet subnet-1
    Default: subnet-1-id
  LoadBalancerSubnet:
    Type: AWS::EC2::Subnet::Id
    Description: Subnet subnet-1
    Default: subnet-1-id
  LoadBalancerVisibility:
    Type: String
    Default: public

Resources:
  CloudWatchLogsRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: ["ec2.amazonaws.com"]
            Action: ["sts:AssumeRole"]
      Policies:
        - PolicyName: AppLogsPolicy
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action:
                  [
                    "logs:CreateLogGroup",
                    "logs:CreateLogStream",
                    "logs:GetLogEvents",
                    "logs:PutLogEvents",
                    "logs:DescribeLogGroups",
                    "logs:DescribeLogStreams",
                    "logs:FilterLogEvents",
                    "logs:PutRetentionPolicy"
                  ]
                Resource: "*"

  InstanceProfile:
    Type: "AWS::IAM::InstanceProfile"
    Properties:
      InstanceProfileName: !Sub ${App}-${AppEnvironment}-CloudWatch
      Roles:
        - !Ref CloudWatchLogsRole

  LogGroup:
    Type: AWS::Logs::LogGroup
    Properties:
      LogGroupName: !Sub /aws/elasticbeanstalk/${App}-${AppEnvironment}/var/log/eb-docker/containers/eb-current-app/stdouterr.log
      RetentionInDays: 7

  App:
    Type: "AWS::ElasticBeanstalk::Application"
    Properties:
      ApplicationName: app-name
      Description: Application description
  
  AppVersion:
    Type: "AWS::ElasticBeanstalk::ApplicationVersion"
    Properties:
      ApplicationName: !Ref App
      Description: String
      SourceBundle:
        S3Bucket: s3-bucket-name
        S3Key: s3-key-name.zip

  AppEnvironment:
    Type: "AWS::ElasticBeanstalk::Environment"
    Properties:
      EnvironmentName: !Sub ${App}-${AppEnvironment}
      ApplicationName: !Ref App
      SolutionStackName: "64bit Amazon Linux 2018.03 v2.15.1 running Docker 19.03.6-ce"
      Tier:
        Name: WebServer
        Type: Standard
        Version: "1.0"
      VersionLabel: !Ref AppVersion
      OptionSettings: 
        - Namespace: aws:elasticbeanstalk:application:environment
          OptionName: APP_ENV
          Value: !Ref AppEnvironment
        - Namespace: aws:elasticbeanstalk:command
          OptionName: DeploymentPolicy
          Value: RollingWithAdditionalBatch
        - Namespace: aws:elasticbeanstalk:command
          OptionName: BatchSizeType
          Value: Fixed
        - Namespace: aws:elasticbeanstalk:command
          OptionName: BatchSize
          Value: 1
        - Namespace: aws:ec2:vpc
          OptionName: VPCId
          Value: !Ref AccountVpc
        - Namespace: aws:ec2:vpc
          OptionName: Subnets
          Value: !Ref EC2Subnet
        - Namespace: "aws:autoscaling:launchconfiguration"
          OptionName: InstanceType
          Value: !Ref EC2InstanceType
        - Namespace: aws:elasticbeanstalk:environment
          OptionName: EnvironmentType
          Value: LoadBalanced
        - Namespace: "aws:elasticbeanstalk:environment"
          OptionName: LoadBalancerType
          Value: network
        - Namespace: "aws:ec2:vpc"
          OptionName: ELBSubnets
          Value: !Ref LoadBalancerSubnet
        - Namespace: "aws:ec2:vpc"
          OptionName: ELBScheme
          Value: !Sub ${LoadBalancerVisibility}
        - Namespace: "aws:autoscaling:launchconfiguration"
          OptionName: IamInstanceProfile
          Value: !Ref InstanceProfile
        - Namespace: aws:elasticbeanstalk:cloudwatch:logs
          OptionName: StreamLogs
          Value: true