AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31

Globals:
  Function:
    Timeout: 10

Parameters:
  ParentLayer:
    Description: The name of the layer
    Type: String
  HelloWorldLayerName:
    Type: String
    Description: Name of the HelloWorldLayer which will be used with current deployment


Resources:
  ChildFunction:
    Type: AWS::Serverless::Function
    Properties:
      # Currently if a base_dir option is provided, the nested stack code URIs
      # Needs to be relative to the base_dir instead of the child templates
      # Changing this behaviour raises concerns of breaking change since
      # Build with nested stack already exhibits this behaviour
      CodeUri: child_functions/
      Handler: child_function.lambda_handler
      Runtime: python3.7
      Layers:
        - Ref: ParentLayer
      Tracing: Active

  HelloWorldLayer:
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: !Ref HelloWorldLayerName
      Description: Hello World Layer
      # Currently if a base_dir option is provided, the nested stack code URIs
      # Needs to be relative to the base_dir instead of the child templates
      # Changing this behaviour raises concerns of breaking change since
      # Build with nested stack already exhibits this behaviour
      ContentUri: ../root_layer/
      CompatibleRuntimes:
        - python3.7
    Metadata:
      BuildMethod: python3.7

  ChildChildStack:
    Type: AWS::Serverless::Application
    Properties:
      # This however can only resolve relative to the current template
      Location: child_child_stack/template.yaml
      Parameters:
        ParentLayer1: !Ref HelloWorldLayer
        ParentLayer2: !Ref ParentLayer