require 'pact/retry'

module Pact
  module Hal
    class HttpClient
      attr_accessor :username, :password, :verbose

      def initialize options
        @username = options[:username]
        @password = options[:password]
        @verbose = options[:verbose]
      end

      def get href, params = {}, headers = {}
        query = params.collect{ |(key, value)| "#{CGI::escape(key)}=#{CGI::escape(value)}" }.join("&")
        uri = URI(href)
        uri.query = query
        perform_request(create_request(uri, 'Get', nil, headers), uri)
      end

      def put href, body = nil, headers = {}
        uri = URI(href)
        perform_request(create_request(uri, 'Put', body, headers), uri)
      end

      def post href, body = nil, headers = {}
        uri = URI(href)
        perform_request(create_request(uri, 'Post', body, headers), uri)
      end

      def create_request uri, http_method, body = nil, headers = {}
        request = Net::HTTP.const_get(http_method).new(uri.request_uri)
        request['Content-Type'] = "application/json" if ['Post', 'Put', 'Patch'].include?(http_method)
        request['Accept'] = "application/hal+json"
        headers.each do | key, value |
          request[key] = value
        end

        request.body = body if body
        request.basic_auth username, password if username
        request
      end

      def perform_request request, uri
        response = Retry.until_true do
          http = Net::HTTP.new(uri.host, uri.port, :ENV)
          http.set_debug_output(Pact.configuration.output_stream) if verbose
          http.use_ssl = (uri.scheme == 'https')
          http.start do |http|
            http.request request
          end
        end
        Response.new(response)
      end

      class Response < SimpleDelegator
        def body
          bod = raw_body
          if bod && bod != ''
            JSON.parse(bod)
          else
            nil
          end
        end

        def raw_body
          __getobj__().body
        end

        def success?
          __getobj__().code.start_with?("2")
        end
      end
    end
  end
end