AWSTemplateFormatVersion: '2010-09-09'
Description: Product for maintenance window creation
Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups:
      - Label:
          default: Instances Details
        Parameters:
          - Environment
          - PatchingFrequency
          - PatchingWindowWeekday
          - PatchingWindowStartTime
          - PatchingWindowDuration
          - PatchingOperation
          - OperationPostPatching
      - Label:
          default: Autoscaling Group Details
        Parameters:
          - IncludeASG
          - RetainHealthyPercentage
          - RefreshASGInstances
    ParameterLabels:
      Environment:
        default: 'Select the environment tag attached to the instances:'
      PatchingFrequency:
        default: 'Select the frequency of patching applied:'
      PatchingWindowWeekday:
        default: 'Enter the day of the week of the patching window:'
      PatchingWindowStartTime:
        default: 'Enter the start time of the patching window in UTC:'
      PatchingWindowDuration:
        default: 'Enter the duration of the patching window in hours:'
      IncludeASG:
        default: 'Select if to include Auto Scaling Groups:'
      RetainHealthyPercentage:
        default: 'Enter the percentage of remaining healthy intances during patching
          (0-90%):'
      RefreshASGInstances:
        default: 'Select if to refresh the instances in the ASG after updating the
          launch configuration:'
      PatchingOperation:
        default: 'Select the patching operation:'
      OperationPostPatching:
        default: 'Select the instance operation post patching:'
Parameters:
  Environment:
    Description: Type of Environment
    Type: String
    AllowedValues:
      - Dev
      - Test
      - Prod
  PatchingFrequency:
    Description: Frequency of patching in days
    Type: Number
    AllowedValues:
      - 7
      - 14
      - 21
      - 28
      - 35
      - 42
    Default: 7
  PatchingWindowWeekday:
    Description: 'Enter the day of the week of the patching window:'
    Type: String
    AllowedValues:
      - Monday
      - Tuesday
      - Wednesday
      - Thursday
      - Friday
      - Saturday
      - Sunday
    Default: Friday
  PatchingWindowStartTime:
    Description: 'Enter the start time of the patching window in UTC:'
    Type: String
    AllowedValues:
      - '01'
      - '02'
      - '03'
      - '04'
      - '05'
      - '06'
      - '07'
      - '08'
      - '09'
      - '10'
      - '11'
      - '12'
      - '13'
      - '14'
      - '15'
      - '16'
      - '17'
      - '18'
      - '19'
      - '20'
      - '21'
      - '22'
      - '23'
    Default: '05'
  PatchingWindowDuration:
    Type: Number
    MinValue: 1
    MaxValue: 23
    ConstraintDescription: Enter a number bewtween 1 - 23
    Description: Patching window duration in hours
    Default: 4
  IncludeASG:
    Type: String
    AllowedValues:
      - 'Yes'
      - 'No'
    Default: 'No'
    ConstraintDescription: 'Choose a valid option '
    Description: Include Auto Scaling Groups?
  RetainHealthyPercentage:
    Type: Number
    MinValue: 10
    MaxValue: 90
    Default: 10
    ConstraintDescription: Enter a number bewtween 10 - 90
    Description: Percentage of remaining healthy intances during patching (10-90%)
  RefreshASGInstances:
    Type: String
    AllowedValues:
      - 'Yes'
      - 'No'
    Default: 'Yes'
    ConstraintDescription: 'Choose a valid option '
    Description: Select if to refresh the instances in the ASG after updating the
      launch configuration
  PatchingOperation:
    Type: String
    AllowedValues:
      - Scan
      - Install
    Default: Install
    Description: Patching operation
  OperationPostPatching:
    Type: String
    AllowedValues:
      - RebootIfNeeded
      - NoReboot
    Default: RebootIfNeeded
    Description: Instance operation post patching
Resources:
  EC2Tagging:
    Type: Custom::EC2Tagging
    Properties:
      Environment: !Ref 'Environment'
      PatchingFrequency: !Ref 'PatchingFrequency'
      PatchingWindowWeekday: !Ref 'PatchingWindowWeekday'
      PatchingWindowStartTime: !Ref 'PatchingWindowStartTime'
      PatchingWindowDuration: !Ref 'PatchingWindowDuration'
      IncludeASG: !Ref 'IncludeASG'
      RetainHealthyPercentage: !Ref 'RetainHealthyPercentage'
      RefreshASGInstances: !Ref 'RefreshASGInstances'
      PatchingOperation: !Ref 'PatchingOperation'
      OperationPostPatching: !Ref 'OperationPostPatching'
      ServiceToken: !Join
        - ''
        - - 'arn:aws:lambda:'
          - !Ref 'AWS::Region'
          - ':'
          - !Ref 'AWS::AccountId'
          - :function:MaintenanceWindowTaggingFunction
    UpdateReplacePolicy: Retain
  MaintenanceWindow:
    Type: Custom::MaintenanceWindow
    Properties:
      Environment: !Ref 'Environment'
      PatchingFrequency: !Ref 'PatchingFrequency'
      PatchingWindowWeekday: !Ref 'PatchingWindowWeekday'
      PatchingWindowStartTime: !Ref 'PatchingWindowStartTime'
      PatchingWindowDuration: !Ref 'PatchingWindowDuration'
      IncludeASG: !Ref 'IncludeASG'
      RetainHealthyPercentage: !Ref 'RetainHealthyPercentage'
      RefreshASGInstances: !Ref 'RefreshASGInstances'
      PatchingOperation: !Ref 'PatchingOperation'
      OperationPostPatching: !Ref 'OperationPostPatching'
      ServiceToken: !Join
        - ''
        - - 'arn:aws:lambda:'
          - !Ref 'AWS::Region'
          - ':'
          - !Ref 'AWS::AccountId'
          - :function:MaintenanceWindowCreationFunction
    UpdateReplacePolicy: Retain
Outputs:
  TaggingStatus:
    Value: !GetAtt 'EC2Tagging.TaggingStatus'
  WindowId:
    Value: !GetAtt 'MaintenanceWindow.WindowId'