Parameters:
  Repository:
    Type: String
    Description: Name of the Repository
    AllowedPattern: ".+"
    ConstraintDescription: "This is a required parameter"
  Branch:
    Type: String
    Description: The git branch that should trigger the repository
    AllowedPattern: ".+"
    ConstraintDescription: "This is a required parameter"
  PipelineName:
    Type: String
    Description: The name of the target CodePipeline
    AllowedPattern: ".+"
    ConstraintDescription: "This is a required parameter"

Resources:
  Role:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          -
            Effect: Allow
            Principal:
              Service:
                - events.amazonaws.com
            Action: sts:AssumeRole
      Path: /
      Policies:
        -
          PolicyName: cwe-pipeline-execution
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              -
                Effect: Allow
                Action: codepipeline:StartPipelineExecution
                Resource: !Join [ '', [ 'arn:aws:codepipeline:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', "*"] ] 

  AmazonCloudWatchEventRule:
    Type: AWS::Events::Rule
    Properties:
      EventPattern:
        source:
          - aws.codecommit
        detail-type:
          - 'CodeCommit Repository State Change'
        resources:
          - !Join [ '', [ 'arn:aws:codecommit:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', !Ref Repository ] ]
        detail:
          event:
            - referenceCreated
            - referenceUpdated
          referenceType:
            - branch
          referenceName:
            - !Ref Branch
      Targets:
        -
          Arn: 
            !Join [ '', [ 'arn:aws:codepipeline:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':', !Ref PipelineName ] ]
          RoleArn: !GetAtt Role.Arn
          Id: !Sub "codepipeline-${Repository}-${Branch}"