begin
  require 'httpclient'
  require 'jsonclient' # defined in 'httpclient' gem as well
rescue LoadError
  # httpclient not found
  # or jsonclient not defined (in old versions of httclient gem)
end

if defined?(::HTTPClient)

  module WebMock
    module HttpLibAdapters
      class HTTPClientAdapter < HttpLibAdapter
        adapter_for :httpclient

        unless const_defined?(:OriginalHttpClient)
          OriginalHttpClient = ::HTTPClient
        end

        unless const_defined?(:OriginalJsonClient)
          OriginalJsonClient = ::JSONClient if defined?(::JSONClient)
        end

        def self.enable!
          Object.send(:remove_const, :HTTPClient)
          Object.send(:const_set, :HTTPClient, WebMockHTTPClient)
          if defined? ::JSONClient
            Object.send(:remove_const, :JSONClient)
            Object.send(:const_set, :JSONClient, WebMockJSONClient)
          end
        end

        def self.disable!
          Object.send(:remove_const, :HTTPClient)
          Object.send(:const_set, :HTTPClient, OriginalHttpClient)
          if defined? ::JSONClient
            Object.send(:remove_const, :JSONClient)
            Object.send(:const_set, :JSONClient, OriginalJsonClient)
          end
        end
      end
    end
  end

  module WebMockHTTPClients
    def do_get_block(req, proxy, conn, &block)
      do_get(req, proxy, conn, false, &block)
    end

    def do_get_stream(req, proxy, conn, &block)
      do_get(req, proxy, conn, true, &block)
    end

    def do_get(req, proxy, conn, stream = false, &block)
      request_signature = build_request_signature(req, :reuse_existing)

      WebMock::RequestRegistry.instance.requested_signatures.put(request_signature)

      if webmock_responses[request_signature]
        webmock_response = webmock_responses.delete(request_signature)
        response = build_httpclient_response(webmock_response, stream, req.header, &block)
        @request_filter.each do |filter|
          filter.filter_response(req, response)
        end
        res = conn.push(response)
        WebMock::CallbackRegistry.invoke_callbacks(
          {:lib => :httpclient}, request_signature, webmock_response)
        res
      elsif WebMock.net_connect_allowed?(request_signature.uri)
        # in case there is a nil entry in the hash...
        webmock_responses.delete(request_signature)

        res = if stream
          do_get_stream_without_webmock(req, proxy, conn, &block)
        else
          do_get_block_without_webmock(req, proxy, conn, &block)
        end
        res = conn.pop
        conn.push(res)
        if WebMock::CallbackRegistry.any_callbacks?
          webmock_response = build_webmock_response(res)
          WebMock::CallbackRegistry.invoke_callbacks(
            {:lib => :httpclient, :real_request => true}, request_signature,
            webmock_response)
        end
        res
      else
        raise WebMock::NetConnectNotAllowedError.new(request_signature)
      end
    end

    def do_request_async(method, uri, query, body, extheader)
      req = create_request(method, uri, query, body, extheader)
      request_signature = build_request_signature(req)
      webmock_request_signatures << request_signature

      if webmock_responses[request_signature] || WebMock.net_connect_allowed?(request_signature.uri)
        super
      else
        raise WebMock::NetConnectNotAllowedError.new(request_signature)
      end
    end

    def build_httpclient_response(webmock_response, stream = false, req_header = nil, &block)
      body = stream ? StringIO.new(webmock_response.body) : webmock_response.body
      response = HTTP::Message.new_response(body, req_header)
      response.header.init_response(webmock_response.status[0])
      response.reason=webmock_response.status[1]
      webmock_response.headers.to_a.each { |name, value| response.header.set(name, value) }

      raise HTTPClient::TimeoutError if webmock_response.should_timeout
      webmock_response.raise_error_if_any

      block.call(response, body) if block

      response
    end
  end

  class WebMockHTTPClient < HTTPClient
    alias_method :do_get_block_without_webmock, :do_get_block
    alias_method :do_get_stream_without_webmock, :do_get_stream

    include WebMockHTTPClients
  end

  if defined? ::JSONClient
    class WebMockJSONClient < JSONClient
      alias_method :do_get_block_without_webmock, :do_get_block
      alias_method :do_get_stream_without_webmock, :do_get_stream

      include WebMockHTTPClients
    end
  end

  def build_webmock_response(httpclient_response)
    webmock_response = WebMock::Response.new
    webmock_response.status = [httpclient_response.status, httpclient_response.reason]

    webmock_response.headers = {}.tap do |hash|
      httpclient_response.header.all.each do |(key, value)|
        if hash.has_key?(key)
          hash[key] = Array(hash[key]) + [value]
        else
          hash[key] = value
        end
      end
    end

    if  httpclient_response.content.respond_to?(:read)
      webmock_response.body = httpclient_response.content.read
      body = HTTP::Message::Body.new
      body.init_response(StringIO.new(webmock_response.body))
      httpclient_response.body = body
    else
      webmock_response.body = httpclient_response.content
    end
    webmock_response
  end

  def build_request_signature(req, reuse_existing = false)
    uri = WebMock::Util::URI.heuristic_parse(req.header.request_uri.to_s)
    uri.query = WebMock::Util::QueryMapper.values_to_query(req.header.request_query, :notation => WebMock::Config.instance.query_values_notation) if req.header.request_query
    uri.port = req.header.request_uri.port
    uri = uri.omit(:userinfo)

    auth = www_auth.basic_auth
    auth.challenge(req.header.request_uri, nil)

    @request_filter.each do |filter|
      filter.filter_request(req)
    end

    headers = req.header.all.inject({}) do |hdrs, header|
      hdrs[header[0]] ||= []
      hdrs[header[0]] << header[1]
      hdrs
    end
    headers = headers_from_session(uri).merge(headers)

    if (auth_cred = auth.get(req)) && auth.scheme == 'Basic'
      userinfo = WebMock::Util::Headers.decode_userinfo_from_header(auth_cred)
      userinfo = WebMock::Util::URI.encode_unsafe_chars_in_userinfo(userinfo)
      headers.reject! {|k,v| k =~ /[Aa]uthorization/ && v =~ /^Basic / } #we added it to url userinfo
      uri.userinfo = userinfo
    end

    signature = WebMock::RequestSignature.new(
      req.header.request_method.downcase.to_sym,
      uri.to_s,
      :body => req.http_body.dump,
      :headers => headers
    )

    # reuse a previous identical signature object if we stored one for later use
    if reuse_existing && previous_signature = previous_signature_for(signature)
      return previous_signature
    end

    signature
  end

  def webmock_responses
    @webmock_responses ||= Hash.new do |hash, request_signature|
      hash[request_signature] = WebMock::StubRegistry.instance.response_for_request(request_signature)
    end
  end

  def webmock_request_signatures
    @webmock_request_signatures ||= []
  end

  def previous_signature_for(signature)
    return nil unless index = webmock_request_signatures.index(signature)
    webmock_request_signatures.delete_at(index)
  end

  private

  # some of the headers sent by HTTPClient are derived from
  # the client session
  def headers_from_session(uri)
    session_headers = HTTP::Message::Headers.new
    @session_manager.send(:open, uri).send(:set_header, MessageMock.new(session_headers))
    session_headers.all.inject({}) do |hdrs, header|
      hdrs[header[0]] = header[1]
      hdrs
    end
  end

  # Mocks a HTTPClient HTTP::Message
  class MessageMock
    attr_reader :header

    def initialize(headers)
      @header = headers
    end

    def http_version=(value);end
  end

end
