# Copyright 2011 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
#     http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.

require 'aws/meta_utils'

module AWS
  module Http
    
    # @private
    class Handler

      attr_reader :base

      def initialize(base, &block)
        @base = base
        if base.respond_to?(:handle)

          unless block.arity == 2
            raise ArgumentError, 'passed block must accept 2 arguments'
          end
          MetaUtils.extend_method(self, :handle, &block)

        elsif base.respond_to?(:handle_async)

          unless block.arity == 3
            raise ArgumentError, 'passed block must accept 3 arguments'
          end

          MetaUtils.extend_method(self, :handle_async) do |req, resp, handle|
            @base.handle_async(req, resp, handle)
          end
          MetaUtils.extend(self) do
            define_method(:handle) do |req, resp|
              raise "attempted to call #handle on an async handler"
            end
            define_method(:handle_async, &block)
          end

        else
          raise ArgumentError, 'base must respond to #handle or #handle_async'
        end
      end

      def handle(request, http_response)
        @base.handle(request, http_response)
      end

      def handle_async(request, http_response, handle)
        Thread.new do
          begin
            self.handle(request, http_response)
          rescue => e
            handle.signal_failure
          else
            handle.signal_success
          end
        end
      end

      def sleep_with_callback seconds, &block
        Kernel.sleep(seconds)
        yield
      end

    end
  end
end