class Jets::Resource::Permission

def definition
  logical_id = permission_logical_id
  definition = {
    logical_id => {
      type: "AWS::Lambda::Permission",
      properties: {
        function_name: "!GetAtt {namespace}LambdaFunction.Arn",
        action: "lambda:InvokeFunction",
        principal: principal
      }
    }
  }
  # From AWS docs: https://amzn.to/2N0QXQL
  # source_arn is "not supported by all event sources"
  definition[logical_id][:properties][:source_arn] = source_arn if source_arn
  definition
end

def initialize(replacements, associated_resource)
  @replacements = replacements
  @associated_resource = associated_resource
end

def permission_logical_id
  logical_id = "{namespace}_permission"
  md = @associated_resource.logical_id.match(/(\d+)$/)
  counter = md[1] if md
  [logical_id, counter].compact.join('').underscore
end

def principal
  Replacer.principal_map(@associated_resource.type)
end

def source_arn
  Replacer.source_arn_map(@associated_resource.type)
end