# Subclasses of BaseGuessor must implement interface:
#   detect_class_name
#   method_name
#   error_message
#
class Jets::Commands::Call
  class BaseGuesser
    include Jets::AwsServices

    # provided_function_name:
    #   admin/related_pages_controller-list_all
    #   admin-related-pages-controller-list-all
    def initialize(provided_function_name)
      @provided_function_name = provided_function_name
    end

    def class_name
      return @class_name if @detection_ran

      @class_name = detect_class_name
      @detection_ran = true
      @class_name
    end

    def function_name
      # Strip the project namespace if the user has accidentally added it
      # Since we're going to automatically add it no matter what at the end
      # and dont want the namespace to be included twice
      @provided_function_name = @provided_function_name.sub("#{Jets.config.project_namespace}-", "")

      code_path = class_name.underscore.gsub('/','-')
      function_name = [Jets.config.project_namespace, code_path, method_name].join('-')
      generated_function_name(function_name)
    end

    def generated_function_name(function_name)
      if function_name.size > Jets::MAX_FUNCTION_NAME_SIZE # name generated by CloudFormation
        logical_id = @class_name.gsub('::','')

        parent_resources = stack_resources(parent_stack.stack_id)
        app_stack = parent_resources.find { |s| s.logical_resource_id == logical_id }

        resources = stack_resources(app_stack.physical_resource_id)
        resource = resources.find { |r| r.logical_resource_id == method_name.camelize + "LambdaFunction" } # method_name only contains the method
        resource.physical_resource_id # actual function name
      else
        function_name
      end
    end

    # Class variable caches
    @@stack_resources = {}
    def stack_resources(stack_name)
      @@stack_resources[stack_name] ||= cfn.describe_stack_resources(stack_name: stack_name).stack_resources
    end

    @@parent_stack = nil
    def parent_stack
      @@parent_stack ||= cfn.describe_stacks(stack_name: Jets::Names.parent_stack_name).stacks.first
    end
  end
end